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CYPD3135-40LQXQ - EZ-PD CCG3 USB Type-C PD Controller | Infineon
The Infineon CYPD3135-40LQXQ is a USB Type-C port controller with USB Power Delivery (USB PD 3.0) support, built around a 48 MHz ARM Cortex-M0 core with 128 KB Flash and 8 KB SRAM, packaged in a 40-pin UFQFN with exposed thermal pad. The device is qualified to six 802.3 USB Type-C standards and supports USB PD 3.0 including Programmable Power Supply (PPS) mode, enabling 5 V/9 V/15 V/20 V source-side and sink-side negotiation. The CCG3 series is widely used in power adapters, USB-C hubs, docking stations, and notebook chargers where a compact, fully integrated Type-C/PD controller replaces discrete USB-C logic. Background - What is a USB Type-C Port Controller? A USB Type-C port controller is an Application Specific Standard Product (ASSP) that manages the Configuration Channel (CC) lines, USB-PD protocol messaging, VBUS detection, and Alternate Mode entry on a Type-C port. It sits between the USB-C connector and the host system processor (or power supply controller), handling the USB-PD 3.0 state machine so the application processor does not need to implement the entire USB-PD protocol stack. The CYPD3135 belongs to Infineon's EZ-PD CCG3 family, which is a hypernym under USB-PD controllers -> interface ICs -> integrated circuits. Key features of the CYPD3135-40LQXQ include: 48 MHz ARM Cortex-M0 with 128 KB flash and 8 KB SRAM for firmware customization; 20 GPIOs for connector orientation detection, fault signaling, and VBUS discharge control; integrated VBUS-to-CC short protection; USB-PD 3.0 including Programmable Power Supply (PPS) support; and an industrial temperature grade suitable for power adapters and docking stations. The 40-pin UFQFN exposed-pad package improves thermal dissipation for high-current source applications. Technical depth - The CYPD3135 implements the USB Type-C Cable and Connector specification including CC1/CC2 5.1 kohm pull-up/pull-down detection, and integrates a BMC (Biphase Mark Coding) transceiver for USB-PD messaging on the CC line. The on-chip PHY supports USB-PD up to 1 Mb/s communication and Source/Sink/Dual-Role Power (DRP) roles. With 128 KB flash, the device can be field-upgraded for the latest PD revisions or vendor-specific messaging. Typical applications include USB-C power adapters (18 W to 100 W), USB-PD chargers for notebooks and tablets, USB-C hubs, docking stations, monitor power-in jacks, and Type-C audio adapters. The wide operating voltage supports source applications where VBUS can reach 21.5 V during high-power contract. Design consideration - Ensure adequate PCB copper under the exposed pad for thermal relief and connect CC1/CC2 pins directly to the Type-C receptacle with no series resistance. Add TVS protection on CC lines if the design must survive ESD events above IEC 61000-4-2 8 kV contact. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.
CYPD3135-40LQXQT - EZ-PD CCG3 USB-C PD Controller, 40-QFN | Infineon
The Infineon (formerly Cypress Semiconductor) CYPD3135-40LQXQT is an EZ-PD CCG3 USB Type-C port controller with USB Power Delivery 3.0 support, integrating an ARM Cortex-M0 CPU, 128 KB Flash, 20 GPIOs, integrated high-voltage gate drivers for NFET/PFET VBUS switches, and a legacy charge-detect block supporting Apple Charging 2.4A, Qualcomm Quick Charge 4.0, and Samsung AFC. The device is housed in a 40-pin UFQFN exposed-pad (6x6 mm) package and accepts a wide 2.7 V to 21.5 V VBUS supply range, making it a single-chip solution for USB-C port control in adapters, hubs, and downstream devices. Background — What is a USB Type-C Port Controller? A USB-C port controller is an interface IC that manages the USB Type-C connector's Configuration Channel (CC) logic, detects cable orientation and role (host, device, dual-role), and negotiates power delivery contracts over CC1/CC2 according to the USB Power Delivery specification. Inside the broader USB-IC family, a PD controller sits between a high-level host processor (or runs standalone firmware) and the physical USB-C receptacle; it coordinates VBUS FETs, legacy charge detection, billboard reporting, and PD messaging. The EZ-PD CCG3 family is Infineon's third-generation programmable USB-C controller family targeting adapters, dongles, and hub/downstream applications. Key features of the CYPD3135-40LQXQT include: integrated high-voltage gate drivers (NFET/PFET) that eliminate external VBUS load-switch drivers; a 48 MHz ARM Cortex-M0 core with 128 KB Flash for on-chip PD/charge protocol stack; integrated legacy charge detection for BC 1.2, Apple 2.4A, QC 4.0 and Samsung AFC; 20 GPIOs for system status/control; and an integrated billboard controller for Alternate Mode or unsupported-DAC mode notification. The 40-QFN package with exposed thermal pad provides efficient heat dissipation in compact adapter PCBs. Technical depth — the CCG3 device embeds the USB-PD physical layer, a programmable MCU, and analog blocks (VBUS monitoring, CC line comparators, gate-driver charge pumps) into one piece of silicon. The 2.7-21.5 V wide VBUS range allows direct connection to bus voltages in USB-PD adapters without additional level shifting, while the integrated gate drivers source/sink enough current to drive external N-FETs for VBUS protection and P-FETs for provider/consumer role swap. Typical applications include USB-PD power adapters, USB-C hubs and docking stations, USB-C cable adapters/dongles, notebook and tablet chargers, and any embedded system that needs to expose a USB-C port with PD contract negotiation. The compact 40-QFN (6x6 mm) footprint fits tight adapter housings. Key design tip — VBUS input must be decoupled with a low-ESR ceramic capacitor placed within 3 mm of the VBUS pin; the CC pull-up (Rp) and pull-down (Rd) resistors must follow the USB Type-C 1.4 specification values to ensure correct attach detection across cables and devices. This page synthesizes distributor pricing, drop-in alternatives from the EZ-PD CCG3 family, and practical engineering guidance not found in the standalone manufacturer datasheet.
CYUSB3302-68LTXIT - HX3 USB 3.0 Hub Controller | Infineon
The Infineon CYUSB3302-68LTXIT is a USB 3.0 SuperSpeed hub controller from the HX3 family, integrating an ARM Cortex-M0 microcontroller core with 32 kB of ROM in a 68-pin VFQFN Exposed Pad package. It supports four downstream ports operating at Low-Speed, Full-Speed, Hi-Speed, and SuperSpeed (5 Gbps) and is designed for both embedded and standalone USB hub applications including battery-charging downstream ports. The 'T' suffix denotes tape-and-reel packaging for high-volume assembly, while the 'I' suffix indicates the industrial temperature grade. A USB 3.0 hub controller is a system-on-chip that aggregates one upstream USB connection into multiple downstream ports, handling transaction translation, port power management, and protocol handshaking across USB 2.0 and USB 3.0 link layers. Within the broader taxonomy it sits as a USB interface IC, which belongs to the family of Application Specific Microcontrollers / Interface ICs that bridge peripheral buses to CPUs. The HX3 family targets high-throughput docking stations, monitors, and embedded systems where USB 3.0 bandwidth is required without external PHY complexity. Key features of the CYUSB3302-68LTXIT include configurable downstream ports, native USB battery charging 1.2 support, integrated 5 Gbps PHY, low-power states per USB 3.0 specification revision 1.0, and ARM Cortex-M0 firmware that the OEM can optionally customize. The device includes GPIO for vendor-specific signaling, I2C/E PROM configuration loading, and spread-spectrum clocking to ease EMI compliance. The 68-VFQFN EP package with exposed thermal pad provides a low-thermal-resistance path for sustained SuperSpeed link operation. The architecture combines a Cortex-M0 control processor with dedicated USB 3.0 and USB 2.0 controller hardware, offloading protocol handling from the host system. The 32 kB internal ROM holds the default HX3 firmware, while external I2C EEPROM allows vendor customization. USB 3.0 specification revision 1.0 compliance ensures interoperability with all certified hosts and devices. Typical applications include USB 3.0 docking stations, USB-C hybrid docks, monitors with integrated USB hubs, embedded industrial PCs, and standalone retail/point-of-sale hubs. Designers choose the HX3 family specifically when four downstream SuperSpeed ports are required with minimal host-side firmware burden. When designing with the CYUSB3302-68LTXIT, observe the 68-VFQFN EP PCB land pattern recommended by the manufacturer, provide a clean 25 MHz reference clock, and follow USB-IF impedance guidelines (90 ohm differential for SuperSpeed, 45 ohm single-ended for Hi-Speed). Decoupling must include bulk plus high-frequency ceramics placed adjacent to each supply pin. This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving procurement and design engineers a single reference for the CYUSB3302-68LTXIT.
CYUSB3328-88LTXC - HX3 USB 5 Gbps Hub Controller | Infineon
The Infineon CYUSB3328-88LTXC is an EZ-USB HX3 USB 3.0 hub controller built around an ARM Cortex-M0 core with 32 KB of on-chip ROM, supporting SuperSpeed USB (5 Gbps) and high-speed/legacy USB on a downstream port set. Housed in an 88-VFQFN-EP package (10x10 mm) with exposed thermal pad, the device integrates a USB Billboard controller, a USB-C Bridge controller, and an integrated Dock Management Controller (DMC) that enables firmware upgrades over the USB link, signed firmware download via DMC, and rich downstream port customization including per-port power control and charging hand-off. A USB 3.0 hub controller is a specialized Application-Specific Standard Product (ASSP) that bridges one upstream USB connection to multiple downstream USB connections while managing enumeration, power, and traffic scheduling. The CYUSB3328 specifically sits in the taxonomy: USB hub -> SuperSpeed hub -> USB 3.0 hub controller -> mixed-signal ASSP -> semiconductor. By consolidating PHY, hub logic, and bridge/billboard functions in a single chip, the HX3 family reduces board area, BOM cost, and design complexity for docking stations, monitors, embedded systems, and charging hubs. The 5 Gbps SuperSpeed datapath is critical because USB 3.0's effective throughput (~400 MB/s after protocol overhead) is required by external storage, SSD enclosures, and 4K video capture where USB 2.0 would bottleneck. Key features include 5 Gbps SuperSpeed USB 3.0 with backward-compatible USB 2.0/1.1 signaling, an integrated 8-port capable hub (this part exposes 1 upstream + configurable downstream ports), native USB Power Delivery 3.0, Battery Charging v1.2 (BC v1.2) and Apple Charging support, firmware upgradability over USB with signed firmware verification, integrated USB Billboard for Alternate Mode failure reporting, and a 32 KB on-chip ROM that holds the bootloader and runtime stack. The part operates from a single 3.3 V supply and provides GPIO for port indicators and VBUS control. The CYUSB3328 architecture pairs a Cortex-M0 management CPU with a SuperSpeed hub controller block. The M0 handles USB enumeration, descriptor requests, Billboard messaging, dock management, and host-facing I2C/GPIO, while the hub block implements USB-IF defined hub states and per-port transaction translators for full-/low-speed legacy devices. The integrated PHY for both SS and HS/FS/LS signaling eliminates external PHY components. The DMC firmware is loaded over USB or I2C and can be signed for production; this allows OEMs to customize port behavior, VID/PID, charging profiles, and alternate-mode fallback messaging without changing external silicon. Typical applications include USB Type-C docking stations, USB 3.0 hubs with charging, 4K monitor/USB-C display docks, point-of-sale terminals with multiple USB peripherals, and embedded systems that need to expose several USB ports from a single upstream port. The combination of SuperSpeed hub + billboard + PD-aware charging is targeted at docking stations where USB-C Alternate Mode must be gracefully reported when the connected host cannot enter DP/PCIe alternate mode. Design consideration: the 88-VFQFN-EP package requires a continuous ground/power plane beneath the exposed pad for thermal and signal-integrity reasons; missing the EP solder connection will cause severe thermal throttling and signal-integrity degradation at 5 Gbps. Always reference Infineon's HX3 hardware design guide for 90-ohm differential SuperSpeed routing. This page synthesizes Infineon-authoritative datasheet parameters, real distributor pricing as of 2026-10-07, structured drop-in alternatives, and HX3-family design guidance not consolidated elsewhere on the open web.
CYUSB3328-88LTXI - HX3 USB 3.0 8-Port Hub Controller | Infineon
The Infineon CYUSB3328-88LTXI is a USB 3.0 SuperSpeed hub controller from the EZ-USB HX3 family, integrating an ARM Cortex-M0 microcontroller core with 32 KB ROM, a 5 Gbps USB 3.0 PHY, and an 88-pin VFQFN exposed-pad package. The device delivers four downstream USB 3.0 ports plus a USB 3.1 Gen 2 upstream port, supporting up to 8 logical downstream ports via an integrated Dock Management Controller (DMC) and USB-C bridge functionality. Native battery-charging support includes USB Power Delivery 3.0, Battery Charging v1.2, and Apple Charging signatures. What is a USB hub controller? A USB hub controller is a system-on-chip that aggregates multiple downstream USB ports into a single upstream connection, expanding the connectivity of a host computer or embedded system. Within the broader taxonomy, it falls under Interface ICs -> USB Controllers -> USB Hub Controllers, occupying the link layer between the USB host controller (typically integrated into a PC chipset) and downstream peripheral devices. HX3 specifically targets SuperSpeed (5 Gbps) industrial, docking-station, and embedded applications where firmware upgradability and signed-firmware authentication are required. Key features of the CYUSB3328-88LTXI include: 5 Gbps USB 3.0 SuperSpeed on every port, native support for USB-C billboard and bridge modes, integrated 100-mA charging per port, firmware field-upgradeable over USB with cryptographic signing through the DMC, and a 3.0V to 3.6V single-supply operation. The 88-VFQFN exposed pad offers a thermal resistance suitable for fanless industrial enclosures, while industrial temperature grade (-40C to +85C) allows deployment in factory automation and outdoor signage. Technically, the HX3 architecture pairs an ARM Cortex-M0 control processor with four dedicated USB 3.0 physical layers and a shared USB 2.0 high-speed hub block. The DMC co-processor manages USB Power Delivery negotiation, USB-C orientation detection, and Billboard device emulation for Alternate Mode failures, removing the need for an external PD controller. Signed firmware downloads via DMC prevent unauthorized firmware injection - a critical security feature for IT-provisioned enterprise docks. Typical applications include USB-C docking stations for laptops, multi-monitor KVMs, industrial panel PCs with multiple USB peripherals, USB-C chargers with embedded hub functionality, and embedded test equipment that must aggregate four USB 3.0 cameras or storage devices. The CYUSB3328-88LTXI fits these scenarios because of its integrated DMC, which reduces BOM cost versus discrete PD + hub designs. Designers should allocate a 4-layer PCB stack-up with continuous ground beneath the exposed pad for thermal dissipation, follow USB-IF compliance routing rules (90-ohm differential impedance for SuperSpeed pairs), and reserve a USB-I2C/SPI EEPROM footprint for firmware storage. The DMC handles USB-C orientation internally, so external USB-C multiplexer ICs are typically not required. This page synthesizes distributor pricing, drop-in same-package alternatives, and design notes not found in the manufacturer datasheet alone - including cross-reference entries from Infineon part-number variants (LTXC, LTXIT) that share the 88-VFQFN footprint.
DAC8740HRGER - Low-Power Fieldbus Modem | Texas Instruments
The Texas Instruments DAC8740HRGER is a low-power HART, FOUNDATION Fieldbus, and PROFIBUS PA-compatible modem with a UART interface, offered in a 24-VQFN 4 x 4 mm package. The verified distributor listing identifies the interface and package, while the manufacturer describes the DAC874xH family as a half-duplex physical-layer modem for industrial process-control and automation systems. Its supported industrial protocols make it suitable for connecting sensors, actuators, transmitters, controllers, and field equipment. A fieldbus modem is an interface IC that converts digital UART information into the physical signaling required by an industrial fieldbus, and it can also receive and decode the corresponding bus waveform. In the HART mode described by Texas Instruments, the DAC8740H integrates the circuitry required for half-duplex HART physical-layer operation in slave or master configurations, reducing the amount of external circuitry needed by the transmitter. FOUNDATION Fieldbus and PROFIBUS PA compatibility broadens its relevance in process plants and industrial automation networks. The verified product data establishes the 24-VQFN 4 x 4 mm package and the UART-based architecture, but it does not provide a complete electrical parameter table in the supplied excerpts. Consequently, operating voltage, current consumption, baud rate, analog performance, temperature range, and protection limits are retained as datasheet-needed fields rather than inferred from the product family name. This conservative approach prevents protocol, supply, and signal-integrity assumptions from entering a design prematurely. The DAC8740HRGER is positioned for industrial measurement and control rather than ordinary consumer UART links. Its fieldbus compatibility is relevant when a controller must communicate with a 2-wire industrial process network through a defined physical layer. The UART interface gives the host processor a familiar digital connection, while the integrated modem circuitry reduces the design burden associated with waveform generation, reception, filtering, and bus coupling. Exact baud-rate and loading requirements should be checked against the complete manufacturer documentation before schematic release. Typical application areas include HART-connected pressure and temperature transmitters, FOUNDATION Fieldbus process instruments, PROFIBUS PA field devices, industrial controllers, sensor gateways, actuator interfaces, and factory automation equipment. The compact VQFN package helps reduce board area compared with larger leaded implementations, although exposed-pad layout, thermal performance, grounding, and high-speed signal routing must be handled according to the manufacturer's land pattern and layout guidance. The most important design step is to select the external network components and protection scheme around the exact bus topology, cable length, and operating mode. Fieldbus transceivers are exposed to industrial transients and long cables, so power-supply filtering, surge protection, grounding, connector design, and separation from noisy switching nodes deserve careful review. Verify pin-level multiplexing, supply sequencing, decoupling, and exposed-pad connections against the complete datasheet before layout sign-off. This page combines the verified manufacturer identity, protocol positioning, package information, distributor references, and engineering cautions. It is intended to help engineers locate the correct device, understand its industrial interface role, and identify which datasheet parameters still require confirmation before a production design is released.
DAC8742HPBS - HART Modem Interface | Texas Instruments
The Texas Instruments DAC8742HPBS is a HART modem interface integrated circuit with UART and SPI support, designed for HART, FOUNDATION Fieldbus, and PROFIBUS PA industrial communication systems. It is packaged in a 32-TQFP (5x5) package and serves as the signal-conditioning interface between a host controller and fieldbus wiring. The verified source data identifies the device specifically as a HART modem interface, while detailed electrical limits, temperature ratings, and internal interface timing remain unavailable in the supplied records. A HART modem interface is a signal-conditioning IC within the broader industrial communication and data-conversion hierarchy. It encodes and decodes Frequency Shift Keying signals used by HART-compatible fieldbus equipment. This allows an embedded controller to communicate over legacy 4-20 mA instrumentation loops without implementing the analog modulation and filtering as discrete circuitry. In a FOUNDATION Fieldbus or PROFIBUS PA installation, the modem interface supports the physical signaling layer while higher-level protocols and safety mechanisms remain the responsibility of the host system. The DAC8742HPBS is valued for integrating dedicated modem functionality into a compact 32-TQFP device. Its UART and SPI host interfaces provide selectable connectivity to embedded processors, allowing command and data transfer between the modem and application firmware. The 5x5 mm package also supports space-constrained industrial instrumentation, although exposed-pad layout and thermal verification must follow the manufacturer package drawing. Because the supplied data does not expose individual pin assignments, supply limits, isolation ratings, or accuracy figures, those details must be checked in the official DAC8742H documentation before schematic approval. Typical uses include HART-compatible sensor transmitters, pressure and flow instrument interfaces, industrial process-control modules, and FOUNDATION Fieldbus or PROFIBUS PA equipment. In these systems, the DAC8742HPBS reduces the discrete component count associated with analog modem circuitry and gives the host MCU a structured digital control path. The principal engineering trade-off is that the modem interface is only one part of the communication chain: the transmitter still requires suitable loop power, filtering, surge protection, grounding, and validated fieldbus wiring. For new designs, verify the exact device variant, supply rails, UART and SPI logic levels, receive bandwidth, transmit modulation limits, loop-current interface, and exposed-pad requirements in the official Texas Instruments datasheet. Do not derive those values from the distributor snippets. The manufacturer product page describes the DAC8742H as HART, FOUNDATION Fieldbus, and PROFIBUS PA compliant with UART/SPI support, making it the authoritative starting point for design review. This page combines verified distributor availability, manufacturer positioning, package information, replacement analysis, and practical integration guidance. It also separates confirmed facts from parameters that require datasheet verification, helping engineers avoid treating incomplete distributor metadata as a complete electrical specification.
DG187AA - SPST Analog Switch, JFET, TO-100-10 | Vishay
The Vishay Siliconix DG187AA is a single-channel SPST (single-pole single-throw) analog switch built around an N-channel JFET switching element with an integrated level-shifting driver. Housed in a 10-pin TO-100 metal can package (round, through-hole, 10 leads), it provides approximately 30 Ohm on-resistance and is part of the DG181 through DG191 analog-gate family originally introduced by Intersil and now manufactured by Vishay Siliconix. According to the verified distributor listings, it is categorized as an SPST analog switch IC. An analog switch (also called a JFET analog gate or solid-state analog switch) is an electronic component that uses a semiconductor device (typically a JFET or MOSFET) to connect or disconnect an analog signal path under the control of a digital logic input. Analog switches sit within the broader taxonomy of signal switches -> multiplexers/switches -> interface ICs -> integrated circuits, and they are essential whenever an analog signal must be routed without injecting distortion, charge injection, or significant series resistance. The DG187AA's JFET architecture keeps the on-resistance relatively constant over a wide analog signal range, which is a key advantage over simple MOSFET-only designs in precision instrumentation. Key differentiating features of the DG187AA include: (1) a high-speed level-shifting driver that accepts low-level CMOS/TTL-compatible inputs (down to approximately 0.8V to 2V) and uses them to control the JFET switch state, (2) analog signal range operation that suits both unipolar and bipolar audio/precision signals, (3) low charge injection thanks to the JFET topology, and (4) a hermetic TO-100 metal can that supports military temperature grades (-55C to +125C). The metal-can packaging also provides excellent EMI shielding for sensitive analog signal routing in instrumentation front-ends. In terms of electrical architecture, the DG187AA integrates the JFET switch die and the level-shifting driver die within a single TO-100 can, allowing the part to be driven directly from logic-level inputs without external pull-ups or level translators. This single-package integration reduces board area and simplifies PCB layout compared with discrete JFET-plus-driver implementations. The switching speed, while not as fast as modern CMOS analog switches, is sufficient for audio, instrumentation multiplexing, sample-and-hold front-ends, and legacy industrial signal routing. Typical applications for the DG187AA include: (1) precision instrumentation multiplexers, (2) audio signal routing in professional and broadcast equipment, (3) sample-and-hold amplifier front-ends, (4) data-acquisition system signal gating, (5) legacy industrial process-control signal switching, and (6) military and aerospace signal routing where the TO-100 hermetic can is required. The MIL-spec /883 variant (DG187AA/883) confirms the part's qualification for harsh-environment designs. When designing with the DG187AA, note that the TO-100 package has 10 leads arranged in a circular metal can, with pin 1 typically marked by a tab or dot near the package base. Because the package is a through-hole metal can (not surface-mount), PCB layout requires plated through-holes on a 0.230 inch lead circle typical of TO-100 cans. Always consult the manufacturer datasheet for the exact pinout, especially when migrating from the /883 to the commercial-temperature variant. This page synthesizes distributor pricing, hermetic package availability, MIL-spec drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
DG309CJ+ - Quad SPST Normally Closed Analog Switch, 60 Ohm | Maxim Integrated
The Maxim Integrated DG309CJ+ is a quad single-pole single-throw (SPST) CMOS analog switch with normally closed (SPST, NC) contacts, 60 ohm typical on-resistance, and approximately 130 ns switching speed, packaged in a 16-pin PDIP (0.300 inch, 7.62 mm) plastic DIP. It is the normally closed companion to the DG308A, which is normally open. An analog switch is a voltage-controlled semiconductor device that routes analog signals between circuit nodes using MOSFET pass elements rather than mechanical contacts. In the taxonomy of electronic components, a DG309CJ+ belongs to the analog switch family, which sits under interface ICs, alongside multiplexers, demultiplexers, and matrix switchers. Because it uses CMOS pass transistors instead of relay contacts, it offers near-solid-state reliability, microsecond-to-nanosecond switching, and negligible signal degradation when the supply rails are respected. Key features include a low 60 ohm on-resistance across the analog range, turn-on time below 120 ns, turn-off time below 90 ns, and very low power dissipation of about 30 nW per closed channel. Inputs are CMOS logic compatible, and the switch supports full rail-to-rail analog signal range operation. Supply options include split rails of plus/minus 5 V to plus/minus 20 V, or a single positive supply of +5 V to +30 V, with a 15 V analog input range. Internally the DG309CJ+ is a monolithic CMOS design. Each normally closed element places a pass transistor in the conducting path so the source and drain are bridged when the control input is low, which is why the part behaves as a shorting analog switch rather than a series isolator. That architecture makes it useful as a signal-shorting or bypass element in sample-and-hold circuits, guidance and control systems, communication systems, and test equipment, where a default connection must remain present when logic is unpowered or de-asserted. Typical applications include heads-up display and military radio signal routing, PBX and PABX switching networks, guidance and control system multiplexing, sample-and-hold front ends, and general-purpose bench test switching. Because the closed state is the default, it is especially suitable for fail-safe signal paths where an open circuit would be more damaging than a shorted one. When designing around the DG309CJ+, always verify the logic polarity of the control input for each channel and confirm that the maximum analog input voltage is not exceeded during transients. Because the package is a through-hole PDIP-16 rather than a surface-mount part, it is also easier to prototype and hand-solder, but requires plated through-holes and more board area than an equivalent surface-mount switch. This page consolidates distributor pricing as of 2026-10-30, verified drop-in alternatives from Maxim, Vishay and Harris, and practical design notes that go beyond the raw parameter table in the manufacturer data sheet.
DG381CJ - CMOS Analog Switch IC | Analog Devices
Analog Devices DG381CJ is a general-purpose CMOS analog switch IC listed in stock at LCSC, with a verified starting price of $1.1653 per unit. The device belongs to the analog-switch category, where CMOS-controlled switches route signals between circuit nodes without continuously conducting current. The verified source identifies the DG381 family as general-purpose CMOS analog switches, while the DG381CJ ordering code is associated with a DIP-14 package. Its detailed supply-voltage rating, channel configuration, on-resistance, leakage current, switching time, and logic thresholds were not included in the supplied data and must be confirmed in the manufacturer datasheet before design release. A CMOS analog switch is a semiconductor interface device that uses electronic control signals to connect or disconnect an analog signal path. The broader hierarchy is analog switch → analog multiplexer or demultiplexer → interface IC → semiconductor. General-purpose versions are selected when a compact board needs programmable signal routing for instrumentation, test, communications, industrial control, or data-acquisition systems. Unlike a mechanical relay, an analog switch changes state electronically; unlike a continuous analog amplifier, it primarily controls signal-path connectivity. The most important verified attributes are the in-stock listing, the $1.1653 starting unit price, the general-purpose CMOS technology classification, and the DIP-14 package associated with the ordering code. These attributes support cost-sensitive prototype and production sourcing, but they do not establish electrical interchangeability by themselves. Before using DG381CJ in a precision measurement path, engineers should verify channel count, normally-open or normally-closed behavior, signal polarity, bandwidth, insertion loss, charge injection, off-state isolation, and maximum analog signal excursion. The DG381 family uses integrated MOS transistors as analog switching elements controlled by CMOS-compatible logic. In a typical circuit, the control pins receive host-generated enable signals while the switched terminals carry analog or digital signals. Because a physical switch has finite resistance, capacitance, leakage, and switching transients, layout and control timing can affect measurement accuracy. The exact architecture, truth table, logic thresholds, and timing values must be taken from the DG381 manufacturer datasheet rather than inferred solely from the distributor listings. Potential uses include automated test equipment, data-acquisition front ends, industrial sensor interfaces, communication routing, laboratory instrumentation, and embedded control systems where multiple signal paths must be selected under software control. A suitable design must keep every signal and control voltage inside the device's documented limits. It should also provide clean supply decoupling and keep high-impedance routing paths short enough to limit capacitive loading and pickup. The primary design consideration is verification of the exact DG381CJ electrical table before schematic sign-off. Cross-reference search results describe DG381ACJ+ and DG300ACJ+ as complete replacements with consistent terminals and packages, but the supplied excerpts do not expose their individual voltage, resistance, timing, or leakage ratings. Engineers should therefore treat those parts as candidate drop-ins and compare every operating limit and timing parameter against the authoritative datasheet. This page consolidates the verified stock and price evidence, candidate pin-compatible replacements, package information, and practical validation guidance into one engineering-focused resource. It also distinguishes confirmed facts from unavailable specifications so procurement and design teams can make a documented decision rather than relying on an incomplete distributor summary.
DG403 - Dual High-Speed SPDT Analog Switch, 44V | Analog Devices
The Analog Devices DG403 is an improved, dual high-speed SPDT (single-pole double-throw) CMOS analog switch designed for precision, high-performance switching of analog signals, with a maximum signal voltage range of 44V permitting control of 30Vp-p signals, guaranteed on-resistance matching of 2 ohm max between switches, and guaranteed on-resistance flatness of 3 ohm max over the signal range, housed in a 16-pin SOIC package. An analog switch is a semiconductor device that passes or blocks analog signals under digital control, acting as the solid-state equivalent of a relay contact. Within the signal-chain hierarchy, the DG403 belongs to the analog switches and multiplexers family, positioned below analog multiplexers (which route many channels) and above simple pass elements, and it is a core building block of analog front-end and signal-routing subsystems in data acquisition systems. Key features include CMOS or TTL-level compatible logic activation, operation from single-ended supplies of +5V to +34V or split supplies from plus/minus 5V to plus/minus 17V, and a high-voltage silicon-gate process. Each of the two independent control inputs selects between two signal paths, providing the equivalent of two SPDT relay contacts with no moving parts. The improved redesign (originally by Maxim Integrated, now Analog Devices) added guaranteed low on-resistance matching between switches and flatness over the signal range, while the epitaxial layer prevents the latch-up associated with older CMOS technologies. The ON-resistance variation with analog signal level is quite low over a plus/minus 15V analog input range, ensuring low signal distortion. Typical applications include audio and video signal routing, precision data-acquisition channel selection, sample-and-hold circuits, and replacing electromechanical relays in industrial and instrumentation signal paths. Where two single-pole single-throw contacts are needed, the DG401 offers SPST functionality; the DG405 offers DPST. Designers should observe supply-rail headroom: analog signal swings must remain within the supply rails, and logic inputs must meet CMOS/TTL threshold levels for correct switching. This page synthesizes distributor pricing, family cross-references, and practical design notes not found in the manufacturer datasheet.
DG403DJ+ - Dual High-Speed SPDT Analog Switch | Analog Devices
The Analog Devices / Maxim Integrated DG403DJ+ is an improved dual, high-speed SPDT analog switch with two independently controlled switches, an on-resistance below 45 ohm, and switching times below 150 ns. The device is supplied in a 16-pin PDIP package and uses TTL- and CMOS-compatible digital control inputs. An analog switch is a semiconductor device that connects or disconnects analog signal paths under digital control. The DG403DJ+ belongs to the monolithic CMOS analog switch hierarchy, where each SPDT pole can route one source node to either of two destination nodes. This makes the device useful for signal routing, sampling, test systems, measurement equipment, and audio or communication circuits that require controlled bidirectional analog paths. Key characteristics include low analog ON resistance, fast switching, and low charge injection. Charge injection is the unwanted voltage pulse produced when control charge enters the analog signal node during a transition. Because the DG403DJ+ limits this effect, it simplifies precise sample-and-hold and switched-capacitor circuits. The TTL- and CMOS-compatible inputs simplify interfacing with both older logic families and modern low-voltage digital controllers. The DG403DJ+ uses a monolithic CMOS implementation to provide low power consumption while supporting bidirectional analog conduction. The Analog Devices product page identifies the DG403 family as production devices and describes a redesigned series with guaranteed on-resistance matching of 2 ohm maximum, on-resistance flatness of 3 ohm maximum, typical on-resistance of 20 ohm, and low charge injection of 15 pC maximum for applicable family specifications. Typical uses include precision analog signal selection, sample-and-hold front ends, automated test equipment, audio routing, and instrumentation where a digital controller must select between two signal sources. Each switch can operate in either signal direction because the on-resistance is specified for bidirectional analog conduction. A practical design consideration is to keep input and output traces short and minimize parasitic capacitance around control and analog nodes. Because charge injection and switching transients are inherent to the transition process, the selected source impedance, downstream capacitance, and acquisition timing should be evaluated together rather than relying only on the 150 ns maximum turn-on time. This page consolidates manufacturer information, distributor pricing, verified same-package alternatives, and application-focused design guidance. It also distinguishes documented family-level specifications from parameters that were not present in the supplied source data, making the remaining engineering uncertainties explicit.
DG405DY+ - Dual 2:1 CMOS Analog Switch, 45 Ohm, 16-SOIC
The Analog Devices DG405DY+ is a dual 2:1 CMOS analog switch with 45 Ohm typical on-resistance and a 16-SOIC package. The device routes analog signals through two independent switch circuits, supports analog signals up to 15 V, and is specified for a maximum supply voltage of 44 V. Its low-power CMOS design provides TTL- and CMOS-compatible control inputs, low leakage, fast switching, and single-supply operation. An analog switch is a semiconductor device that connects or disconnects signal paths under digital control. Unlike a mechanical relay, a CMOS analog switch changes state rapidly with no moving parts. The DG405 belongs to the analog switch hierarchy, which includes multiplexers, demultiplexers, and matrix switches. These devices are widely used to route measurements, control signals, and sensor outputs between shared circuit nodes. Key electrical features include 45 Ohm typical on-resistance, 20 Ohm typical on-resistance in the redesigned DG405 series, low off leakage of 40 pA, and switch-on time below 100 ns. Charge injection is limited to 15 pC, while on-resistance matching and flatness are guaranteed to 2 Ohm and 3 Ohm maximum, respectively. These characteristics support accurate, high-speed signal routing without the switching transients associated with mechanical contacts. The DG405 uses monolithic CMOS construction to combine low power consumption with fast control response. TTL-compatible inputs simplify interfacing with legacy digital logic, while CMOS compatibility supports modern controllers. Its 44 V maximum supply rating and 15 V analog signal range provide additional headroom in industrial, instrumentation, and test systems, although the precise minimum supply voltage must be confirmed in the manufacturer datasheet. Typical uses include multiplexed measurement front ends, sample-and-hold systems, automated test equipment, and control paths where one of two signal sources must be connected to a common amplifier or converter. The device is particularly useful where switching speed and low leakage matter more than ultra-low on-resistance, such as sensor selection, video routing, and precision measurement multiplexing. When laying out a DG405DY+ board, place input and output traces short, keep analog routing paths away from high-current switching nodes, and use a ground plane that provides a low-impedance return for control and signal currents. Verify that every signal remains within the 15 V analog range and that the supply never exceeds the 44 V maximum rating. This page combines manufacturer and distributor product information, documented cross-reference alternatives, package details, application guidance, and design notes. It also identifies the verified electrical data and highlights the parameters that still require confirmation from the full manufacturer datasheet before a production design is released.
DG406DN+ - 16:1 CMOS Analog Multiplexer | Vishay
Vishay Intertechnology DG406DN+ is a 16-channel, single-ended CMOS analog multiplexer that routes one of 16 inputs to a common output according to a 4-bit binary address. It offers a typical on-resistance of 50 ohm, low charge injection of 15 pC, a fast transition time of 200 ns, low power consumption of 0.2 mW, and a maximum supply rating of 44 V. The device is supplied in a 28-pin PLCC package measuring 11.51 mm by 11.51 mm. An analog multiplexer is an interface IC that selects one signal path from multiple analog inputs and connects it to a shared output. This reduces the number of input channels required by a data-acquisition, test, measurement, control, or communication system. The DG406DN+ belongs to the CMOS analog-switch and multiplexer hierarchy, where low on-resistance, controlled charge injection, and predictable transition behavior help preserve signal fidelity. Key features include a guaranteed maximum on-resistance of 100 ohm and operation in either signal direction. Improved versions also provide guaranteed channel matching of no more than 8 ohm and flatness of no more than 9 ohm over the specified signal range. The 4-bit address interface supports 16 channel selections, while the single-supply capability simplifies power architecture in systems that do not require dual-rail operation. The DG406DN+ uses CMOS construction to provide low power use while maintaining short switching transitions. Its 15 pC charge-injection figure reduces the transient error produced when the address changes. Low on-resistance is particularly useful when routing higher-impedance sensors or low-amplitude signals because it minimizes voltage loss and improves input impedance. The 200 ns transition time supports faster measurement sequences than a slower mechanical or relay-based selector. Typical uses include multiplexed sensor acquisition, automated test equipment, data acquisition, industrial control, signal routing, and communication systems. In each case, the DG406DN+ can consolidate multiple analog inputs onto a shared amplifier, converter, or processing channel. Designers must still evaluate signal amplitude, bandwidth, injected charge, and channel settling time for their specific source impedance and acquisition speed. The primary design consideration is ensuring that the selected source impedance, acceptable settling interval, and allowable charge-injection error match the application. A low source resistance reduces settling error, while high source impedance can increase sensitivity to switch resistance and capacitance. Decoupling, grounding, and address-transition timing should be handled according to the manufacturer recommendations. This page consolidates verified manufacturer and distributor information, package characteristics, pricing, drop-in candidates, and practical application guidance. It also distinguishes documented electrical facts from values that require confirmation, providing a practical engineering starting point without treating undocumented specifications as guaranteed.
DG407CJ+ - Dual 8:1 CMOS Analog Multiplexer, 100 Ohm | ADI
The Analog Devices (Maxim Integrated) DG407CJ+ is an improved dual 8-channel (differential 8:1) CMOS analog multiplexer delivering a maximum on-resistance of 100 ohm in a 28-pin PDIP (DIP-28) package. It integrates two independent 8:1 switch circuits for true differential signal switching in a single device. An analog multiplexer is a type of analog switch IC that selects one of several input signals and routes it to a single output under digital control. In the broader signal-chain hierarchy, the multiplexer sits between sensors or signal sources and amplifiers or ADCs, functioning as the routing element of data acquisition and instrumentation systems. The DG407 belongs to the CMOS analog multiplexer switch IC family alongside related devices such as the DG406 (16:1 single-ended version). Key features include guaranteed channel-to-channel on-resistance matching of 8 ohm max, on-resistance flatness of 9 ohm max over the specified signal range, and bidirectional signal conduction - the switches conduct equally well in either direction. The redesigned DG406/DG407 family from Maxim (now Analog Devices) improved matching and flatness over earlier CMOS multiplexer generations, which directly reduces signal-path distortion and channel-to-channel gain error in precision systems. Technically, the DG407 uses CMOS transmission-gate switch elements driven by internal TTL/CMOS-compatible logic decoding, allowing either supply configuration commonly used in industrial analog front ends. Break-before-make switching prevents momentary shorting of two selected channels during address transitions, an important behavior for measurement integrity. Typical applications include differential data acquisition systems, precision test and measurement instrumentation, industrial process-control front ends, and audio or telemetry signal routing where a low 100 ohm max on-resistance preserves signal amplitude with typical load impedances. A key design consideration: on-resistance of 100 ohm forms a divider with the load impedance, so keep load resistance at least 100x higher (10 megaohm or appropriate buffering) to limit gain error, and verify logic-level compatibility with your controller supply rails. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
DG407DJ+ - Dual 8:1 CMOS Analog Multiplexer | Analog Devices
Analog Devices DG407DJ+ is a dual 8:1 CMOS analog multiplexer with 100 ohm maximum on-resistance, 15 pC maximum charge injection, 8 ohm maximum channel matching, and 9 ohm maximum flatness, housed in a 28-pin PDIP package. The device combines two independently selectable 8-to-1 analog switches with TTL- and CMOS-compatible decoding, a logic-threshold voltage reference, and an enable input for cascading multiple multiplexers. An analog multiplexer is a switching interface that connects one source path to one of several signal paths. The DG407 belongs to the broader analog switch and multiplexer hierarchy, where it enables one physical signal to be routed among multiple sensors, test points, amplifiers, or data-conversion channels. Its differential 8-channel configuration makes it useful when the switched signal must be balanced or when two related signals are selected together. Key features include a maximum on-resistance of 100 ohm, guaranteed channel matching of 8 ohm maximum, and signal-range flatness of 9 ohm maximum. Charge injection is limited to 15 pC maximum, reducing the switching transient that can otherwise disturb precision measurement nodes. The on-resistance conducts equally well in either direction, while TTL- and CMOS-compatible address inputs simplify control from digital logic. Internally, the DG407 uses an array of 16 analog switches and a digital decode circuit for channel selection. A voltage reference establishes the logic thresholds, and the enable input permits device selection when more than one multiplexer is installed. These functions allow engineers to construct larger switched-channel systems while retaining standardized digital control. Typical applications include battery-cell measurement, automated test equipment, data acquisition, industrial process monitoring, instrumentation, and multiplexed sensor interfaces. The device is particularly appropriate when a low-frequency analog node must be routed among several inputs with controlled resistance, matching, and charge injection. Designers should account for the 100 ohm maximum on-resistance when calculating source impedance and settling behavior. Input and ground routing should minimize parasitic resistance and coupling, while digital address and enable traces should be kept away from sensitive analog conductors. The 28-pin PDIP package also requires adequate through-hole spacing and suitable protection from mechanical or moisture exposure. This product page combines the verified manufacturer and distributor information with package-specific selection guidance, data gaps, pricing context, and same-footprint alternatives. It distinguishes directly documented variants from candidates that require independent pin, logic-level, and absolute-maximum-rating verification before substitution.
DG407DN+ - Dual 8:1 CMOS Analog Multiplexer | Analog Devices
The Analog Devices DG407DN+ is an improved dual 8-channel CMOS analog multiplexer with a maximum on-state resistance of 100 ohm, packaged in a 28-pin PLCC. It combines two independently addressed 8:1 muxes with TTL- and CMOS-compatible channel-selection logic, allowing sixteen analog inputs to share two common outputs. The device supports communication systems, audio signal routing, data acquisition, guidance and control systems, sample-and-hold circuits, and test equipment. An analog multiplexer is a semiconductor switching network that routes one of several analog inputs to a shared output according to binary address and enable signals. In the signal-chain hierarchy, the DG407DN+ is a CMOS analog switch IC, a precision signal-routing component, and part of a broader data-acquisition or communication system. The 28-pin PLCC provides a standardized leaded surface-mount footprint suitable for compact industrial, instrumentation, and embedded-control equipment. The manufacturer describes DG407 as an improved 16-channel or dual 8-channel CMOS analog multiplexer family. Verified distributor information identifies DG407DN+ as a two-circuit 8:1 switch with 100-ohm maximum on-state resistance in a 28-pin PLCC measuring 11.51 mm by 11.51 mm. Its TTL- and CMOS-compatible digital decode circuitry allows the address and enable inputs to operate with common logic families, while the enable function can deselect the mux when it is not required. The DG407 family includes sixteen analog switches, a binary channel-selection decoder, a voltage reference for logic thresholds, and an enable input for device selection. This integrated addressing arrangement reduces the number of external control components required in multiplexed analog systems. The Analog Devices product page also identifies the DG406 and DG407 devices as pin-compatible plug-in upgrades for the industry-standard DG506A and DG507A families, supporting design migration without changing the board footprint. Typical uses include selecting among multiple sensors in a data-acquisition system, routing audio signals between functional blocks, multiplexing instrumentation channels, and directing control signals in communication equipment. Because the mux contains two 8:1 sections, adjacent channel pairs can also be combined as differential or paired selections where the system architecture requires it. The principal design trade-off is the 100-ohm maximum on-state resistance, which can introduce signal attenuation and distortion compared with lower-resistance switching networks. PCB designers should keep analog traces short and provide a stable ground reference beneath the PLCC while separating sensitive inputs from switching or digital return currents. Power and ground connections should be decoupled close to the device, and unused digital inputs should be driven to a defined logic level rather than left floating. The manufacturer datasheet should be consulted for the exact pin assignments, truth table, control timing, electrical limits, and recommended operating conditions before layout or firmware is released. This product record combines verified manufacturer and distributor information, package and pricing references, pin-compatible alternatives, application guidance, and practical selection considerations. It is intended to support sourcing and engineering evaluation while preserving explicit markers wherever the supplied source material does not expose a verified parameter.
DG408CY+ - 8:1 CMOS Analog Multiplexer, 16-SOIC | Maxim Integrated
The Maxim Integrated DG408CY+ is an 8:1 CMOS analog multiplexer in a 16-pin narrow SOIC package, featuring 100Ω maximum on-resistance and 15pC maximum charge injection. It selects one of eight analog inputs through three digital control inputs and supports bidirectional signal conduction, making it suitable for multiplexed measurement, instrumentation, data acquisition, and control systems. The device also provides rail-to-rail signal handling, TTL/CMOS-compatible controls, and low power consumption of 1.25mW maximum. What is an analog multiplexer? An analog multiplexer is an analog switch that connects one common terminal to one of several input terminals. The DG408CY+ belongs to the CMOS analog switch and multiplexer hierarchy, where CMOS circuitry controls low-resistance, bidirectional signal paths. In a typical system, address logic selects a sensor, voltage source, or measurement channel, while the common terminal routes that signal to an ADC, amplifier, or signal-processing circuit. The DG408 can also be used as a demultiplexer when the design requires distributing a signal toward multiple destinations. Key verified features include guaranteed channel matching of 8Ω maximum, on-resistance flatness of 9Ω maximum, maximum on-resistance of 100Ω, and maximum charge injection of 15pC. Input off-leakage is specified below 5nA at 85°C. The device uses TTL/CMOS-compatible digital input control and includes ESD protection exceeding 2000V according to the listed product information. Its 16-pin narrow SOIC package supports conventional surface-mount assembly while keeping the analog signal routing compact. The improved DG408CY+ design emphasizes repeatable channel behavior across the specified signal range. This matters when multiple measurements are compared in instrumentation, automated test equipment, or data-acquisition systems because channel mismatch can create systematic measurement error. Its bidirectional conduction also allows the common signal path to be used according to the system architecture, although external protection and input-voltage limits must be respected. Typical uses include switching analog inputs into an ADC, selecting external sensors, routing test signals, implementing sample-and-hold front ends, and controlling laboratory or industrial measurement equipment. For high-impedance sources, leakage and off-state behavior can be important; for low-impedance signals, on-resistance and charge injection deserve attention. The DG408CY+ is therefore most appropriate when a compact, multiplexed analog-routing solution is needed with verified low-leakage and controlled charge-injection behavior. When laying out the circuit, keep analog traces short and route control signals away from sensitive analog nodes. Confirm that supply voltage, logic levels, input voltage range, and switch-cycle timing meet the device requirements before use. This page consolidates distributor information, verified datasheet features, package details, and design guidance for engineers evaluating the DG408CY+.
DG408DJ+ - 8-Channel 100Ω CMOS Analog Mux | Analog Devices
Analog Devices DG408DJ+ is an improved 8-channel, single-ended CMOS analog multiplexer with 100 ohm on-resistance, 8:1 signal routing, and a 16-pin PDIP package. Designed for bidirectional analog conduction, it connects one of eight inputs to a common output according to three binary address inputs, A0, A1, and A2. It can also be used as an 8-channel demultiplexer when signal-flow requirements permit. An analog multiplexer is a semiconductor switching network that routes multiple analog inputs onto a shared output path. The DG408DJ+ belongs to the analog switch and multiplexer hierarchy and combines eight switch elements, TTL/CMOS-compatible channel decoding, and device-enable control in one integrated circuit. This integration reduces discrete switching hardware in data-acquisition, test, communication, guidance, and control systems. The verified product information identifies a nominal 100 ohm on-resistance, 15 pC maximum charge injection, and input off-leakage below 5 nA at 85°C. Its equal bidirectional conduction makes the device suitable for routing signals where the source and destination roles can change. The three address inputs determine the selected channel, while the enable control allows the device to be removed from active service without changing the board interface. The DG408DJ+ is identified as an improved member of the DG408 family and as a pin-compatible upgrade for the industry-standard DG408. Analog Devices lists audio-signal routing, communication systems, data acquisition, guidance and control systems, sample-and-hold circuits, and test equipment among its applications. These uses illustrate why switching bandwidth, on-resistance, leakage, and control compatibility must be evaluated together. A primary design advantage is the ability to consolidate an eight-way analog routing matrix into one 16-pin IC. Logic-grounded address and enable signals control the selected path, while the common analog node reduces the number of external routing connections. Engineers should still verify signal amplitude, bandwidth, settling behavior, supply requirements, and all device limits against the current Analog Devices datasheet before releasing a production design. When sourcing a replacement, preserve the 16-pin PDIP footprint and confirm pin-level compatibility rather than relying only on the DG408 family name. Similar multiplexers can differ in address decoding, enable polarity, injection, leakage, supply range, and electrical performance. The official Analog Devices product page and datasheet remain the controlling sources for those details. This page combines verified distributor availability, manufacturer documentation, functional application analysis, and same-footprint replacement guidance. It is intended to help engineers identify the DG408DJ+, locate its documentation, understand its multiplexing role, and plan a technically defensible sourcing or replacement decision.
DG409CJ+ - Dual 4:1 CMOS Multiplexer | Analog Devices
Analog Devices DG409CJ+ is a dual 4:1 CMOS analog multiplexer with 100 ohm maximum on-resistance, 150 ns switching performance, and a 16-pin DIP package. The device supports supply voltages from 5 V to 30 V, operates as two independent 4-position analog switches, and provides break-before-make behavior for applications requiring isolated signal paths. An analog multiplexer is an interface IC that routes one of several input signals to an output terminal under digital control. The DG409 family is described as an improved 8-channel or dual 4-channel CMOS analog multiplexer. In each 4:1 section, four inputs share one output, while separate address-select inputs determine the active path. This places the device in the analog switch and multiplexer hierarchy within broader signal-routing and interface semiconductor systems. Key features include a maximum on-resistance of 100 ohm, 150 ns switching time, low off leakage current of 500 pA, and operation across a 5 V to 30 V supply range. The manufacturer also identifies guaranteed channel matching of 8 ohm maximum and signal-range flatness of 9 ohm maximum for the redesigned DG408 and DG409 families. These characteristics help minimize gain error, channel-to-channel mismatch, and distortion when routing precision analog signals. The DG409CJ+ uses CMOS multiplexing architecture with separate control logic for the two 4:1 sections. Break-before-make switching prevents the incoming and outgoing paths from conducting simultaneously during transition, reducing signal contention in test, measurement, and instrumentation systems. The 16-DIP package provides through-hole mounting and approximately 7.62 mm lead pitch according to the verified distributor listing. Typical uses include automated test equipment, data acquisition, analog signal routing, industrial control, instrumentation, and communications systems. One multiplexer section can select among four sensor outputs while the other routes a separate group of four inputs, allowing a compact dual-bank routing architecture. Designers must also account for the relatively high on-resistance compared with modern low-resistance multiplexers when driving high-impedance or high-capacitance loads. For PCB design, place the DG409CJ+ close to the routed analog signals to minimize trace capacitance and pickup. Confirm logic levels and supply tolerances before decoding address inputs, and verify downstream loading because the 100 ohm maximum path resistance can create signal attenuation with a finite input impedance. This page combines verified manufacturer and distributor information, drop-in family alternatives, application guidance, and a parameter-by-parameter comparison. It also identifies unavailable electrical details explicitly rather than estimating unverified values, helping engineers evaluate the DG409CJ+ for new designs and legacy replacements.
DG409DJ+ - Dual 4-Channel CMOS Multiplexer | Analog Devices
The Analog Devices DG409DJ+ is an improved dual 4-channel CMOS analog multiplexer with 100 ohm on-resistance, 15 pC maximum charge injection, and operation from 5 V to 30 V in a 16-pin PDIP package. It supports bidirectional signal conduction and can also operate as a demultiplexer, making it suitable for analog routing, data acquisition, test equipment, communication systems, audio-signal routing, and sample-and-hold circuits. An analog multiplexer is an interface-switching IC that selects one of several analog terminals and connects it to a common output. The DG409 belongs to the CMOS analog multiplexer hierarchy, alongside demultiplexers and analog switches. Its digital address and control inputs determine the selected channel, while the internal CMOS switch array routes the selected analog signal in either direction. Key features include two independent 4-channel sections, low on-resistance, low charge injection, low off leakage, and guaranteed channel matching and flatness over the specified signal range. The verified product information identifies the device as an improved replacement-compatible mux family and lists 4:1 operation, 100 ohm on-resistance, a 16-pin PDIP package, and a 5 V to 30 V supply range. The device uses TTL/CMOS-compatible decoding logic, allowing it to be controlled by common digital interface voltages. Its multiplexed architecture reduces the number of external signal lines needed when several analog sources must be routed to one processing channel. Because the switch conducts equally well in both directions, the same device can support routing and demultiplexing arrangements when system timing and signal polarity are suitable. Typical applications include audio-signal routing, communication systems, data-acquisition systems, guidance and control systems, sample-and-hold circuits, and test equipment. In these systems, the DG409DJ+ can select among multiple sensors, instrument channels, or signal sources before conversion, amplification, measurement, or further processing. For PCB design, preserve the PDIP pin mapping and route analog traces away from high-current switching nodes. Confirm supply voltage, logic levels, signal amplitude, channel timing, leakage, and off-state behavior against the manufacturer datasheet. The verified data does not provide complete pricing, electrical limits, or a full pin list, so those values must be confirmed before release to production.
DG411CJ+ - Quad SPST Analog Switch | Analog Devices
Analog Devices DG411CJ+ is an improved quad, single-pole single-throw analog switch with four independent normally closed switch circuits and TTL- and CMOS-compatible control inputs. It is supplied in a 16-pin PDIP package for through-hole PCB installation. The manufacturer identifies the DG411 family as production devices and describes the switch family as low-on-resistance matching and flatness designs, with on-resistance matching up to 3 ohms and signal-range flatness up to 4 ohms. An analog switch is an integrated semiconductor device that routes analog or digital signals under electronic control. In the broader hierarchy, an analog switch belongs to interface ICs, alongside multiplexers, demultiplexers, and switch matrices. The DG411CJ+ is useful when a system must connect, isolate, sample, or route four independent signal paths without using mechanical relays. Key benefits of the DG411 family include matched behavior among the four switches, low on resistance, fast switching, and CMOS-compatible logic control. The normally closed topology means each switch conducts when its control input is in its inactive state and opens when commanded. This behavior can simplify fail-safe signal paths, though exact control-state interpretation should be confirmed from the manufacturer datasheet before implementation. The DG411 family comprises multiple package and temperature options. The CJ+ ordering code specifically identifies the 16-pin PDIP package, so it should not be confused with surface-mount or military-package variants. Its through-hole format is useful for legacy instrumentation, laboratory equipment, industrial controls, and hand-built or low-volume systems where SOIC or dual-inline-package assembly is preferred. Typical uses include multimeter and test-equipment signal routing, sample-and-hold paths, industrial sensor interfaces, audio test systems, and analog measurement chains. Because the device is an integrated circuit rather than a power semiconductor, a safe operating area chart is not applicable. Thermal and switching analysis should instead consider package dissipation, control timing, signal amplitude, load impedance, and the selected external circuitry. The principal design consideration is package interchangeability. Verify the CJ+ package suffix, pin orientation, and SPST normally closed behavior against the current manufacturer datasheet before substitution. PCB layout should keep control traces away from sensitive analog paths, use a solid ground reference, and place protection or settling networks where required by the source and destination impedances.
DG411DJ+ - 4-Channel SPST Analog Switch | Analog Devices
The Analog Devices DG411DJ+ is a four-channel, single-pole single-throw CMOS analog switch with a 45 ohm on resistance, operating from 10 V to 30 V in a 16-pin PDIP package. The four independent normally closed switches support 1:1 signal routing and are controlled by TTL- and CMOS-compatible logic inputs. An analog switch is a semiconductor-controlled routing device that connects or disconnects an analog signal path under digital control. The DG411 belongs to the analog-switch hierarchy, where a CMOS switch IC combines low-voltage control logic with low-power, high-impedance off-state behavior. It is intended for precision test, measurement, audio, video, and industrial signal-routing systems where a compact four-channel device reduces component count. The DG411 family provides improved matching among its four switches and guaranteed on-resistance flatness across the signal range. According to the Analog Devices DG411 product page and manufacturer datasheet, redesigned DG411 devices feature on-resistance matching of 3 ohm maximum and on-resistance flatness of 4 ohm maximum. These characteristics are useful when several channels must present similar resistance to precision measurement and signal-conditioning circuits. The normally closed configuration routes each switched node to its corresponding common terminal while the control input is asserted. This differs from normally open SPST switches, which leave the signal path disconnected until enabled. DG411DJ+ combines four independent channels in one 16-pin PDIP package, allowing simultaneous routing of multiple sensor, audio, video, or test signals without using four separate switch packages. Typical uses include audio and video signal routing, automated test equipment, sample-and-hold front ends, data acquisition systems, battery-powered instrumentation, and industrial measurement modules. The monolithic CMOS implementation provides high input impedance and low leakage, while the low on resistance helps reduce signal attenuation when a channel is closed. The principal design consideration is signal voltage and logic compatibility. Verify the absolute maximum signal and supply limits in the manufacturer datasheet, do not exceed the 30 V supply-voltage ceiling, and ensure the control levels meet the device's TTL- or CMOS-compatible input thresholds. The 16-pin through-hole package also requires adequate lead spacing, insertion clearance, and protection from electrostatic discharge during handling. This product page consolidates verified distributor availability, manufacturer information, comparison data, and practical application guidance for engineers evaluating the DG411DJ+ as a quad SPST routing device.
DG411DY+ - 4-Channel 45Ω SPST Analog Switch | Analog Devices
The Analog Devices DG411DY+ is a 4-channel, single-pole single-throw CMOS analog switch with 45 Ω maximum on-resistance, TTL- and CMOS-compatible control inputs, and a 16-pin SOIC package. The four independent switches route one source terminal to one drain terminal each, making the device suitable for analog signal selection, test systems, instrumentation, and signal isolation. An analog switch is a solid-state semiconductor that connects or disects an analog signal path under digital control. The DG411 belongs to the analog switch and multiplexer hierarchy, where multiplexers combine multiplexing or demultiplexing functions and analog switches provide individual routing paths. Its CMOS implementation offers low power requirements and compatibility with digital control systems, while the normally closed architecture provides a defined connection state when control signals are absent. Key verified characteristics include four independent SPST channels, a 1:1 signal configuration, 45 Ω maximum on-resistance, and a 16-SOIC package. The manufacturer identifies the DG411 family as improved, with low on-resistance matching between switches of 3 Ω maximum and guaranteed on-resistance flatness of 4 Ω maximum over the signal range. These characteristics are important when several channels must present similar resistance to precision measurement or acquisition circuits. The DG411 series is designed around low on-resistance matching and flat on-resistance behavior. Matching reduces channel-to-channel gain or measurement variation, while flatness helps preserve signal behavior as the analog voltage changes. The family uses TTL- and CMOS-compatible digital inputs, allowing its control signals to be driven by common digital logic while switched signals remain in the analog domain. Typical uses include battery-powered test equipment, automated measurement interfaces, signal routing in instrumentation, communication equipment, and data-acquisition systems. Because the device is an analog switch rather than an amplifier, ADC accuracy also depends on source impedance, settling behavior, leakage, reference quality, and the surrounding signal chain. The verified source data does not provide complete timing, leakage, supply-current, and absolute-maximum-rating values, so those specifications require confirmation from the manufacturer datasheet before design release. The principal design consideration is verifying control levels, supply arrangement, signal excursion, and channel polarity against the complete datasheet. Place the device close to the source and destination circuits to minimize trace resistance and capacitance. Account for 45 Ω maximum on-resistance in the signal-path budget, especially for high-value sources or precision dividers. Do not infer ratings from a distributor category listing alone; use the manufacturer datasheet for electrical limits and test conditions. This product data combines the verified manufacturer overview, distributor package and pricing references, and practical replacement guidance. It distinguishes documented facts from unavailable parameters, helping engineers evaluate DG411DY+ for routing applications without inventing missing electrical data.