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MC33993DWBR2 - 22-Ch Switch Detection Interface | NXP
The NXP MC33993DWBR2 is a Multiple Switch Detection Interface (MSDI) IC that monitors the closing and opening of up to 22 switch contacts, housed in a 32-pin SOIC Wide (SOIC W / DWB) package with tape-and-reel packaging and AEC-Q100 automotive qualification. It supports a supply voltage range of 5.5V to 26V (with 4.5V to 5.5V compatibility via SPI configuration), and communicates with the host MCU through an SPI (Serial Peripheral Interface) bus up to 8 MHz. A Multiple Switch Detection Interface (MSDI) is a type of specialized automotive interface IC that scans multiple mechanical or electronic switch inputs and reports their state to a microcontroller. It belongs to the broader hierarchy of interface ICs -> communication ICs -> automotive semiconductors, and is engineered to replace discrete pull-ups and multiplexing circuits with a single robust solution. This category of IC dramatically reduces wiring harness complexity in body control modules by allowing many switches to share a common return path. Key features include 22 input channels with programmable wetting current (typically 1 mA, 6 mA, or 16 mA selectable via SPI), built-in debounce timers, an analog-to-digital mode for ratiometric measurement, an interrupt output to wake the host MCU on state change, and robust automotive transient immunity. The 32-pin SOIC W (DWB) package supports -40C to +125C automotive operating temperature range and is qualified per AEC-Q100 standards. The MC33993 uses a sequential scanning architecture where each switch input is multiplexed through an internal analog front-end, then compared to programmable thresholds. The SPI register map provides status, configuration, and interrupt control. Two programmable wetting current sources ensure reliable operation with both dry-contact and electronic switches by preventing contact oxidation. Typical applications include automotive body control modules for window switches, door lock and mirror controls, steering wheel button clusters, HVAC control panels, and seat adjustment switches. The device replaces discrete resistor networks and dozens of MCU pins, freeing the host processor for higher-level functions while maintaining low quiescent current (<=100 uA typical standby). When designing with this part, ensure the SPI master clock does not exceed 8 MHz and configure wetting current to match the switch contact type. For battery-connected applications, add reverse-battery and load-dump protection per system requirements. This page synthesizes drop-in alternatives, parametric comparison data, and practical design notes not found in the manufacturer datasheet alone.
MC44BS373CAD - PLL-Tuned UHF/VHF Audio/Video Modulator | NXP
The NXP MC44BS373CAD is a PLL-tuned UHF and VHF audio/video high-integration CMOS modulator designed for VCRs, set-top boxes, and similar consumer video appliances. It supports multiple television standards including NTSC and PAL, integrates a programmable RF output stage, and is controlled via a 5 V- and 3.3 V-compatible I2C bus. The device is supplied in a 16-pin SOIC (SO16NB) small-outline package with gull-wing leads. A modulator (in this context, an RF modulator) is a transmitter IC that mixes a baseband audio and composite-video signal up to a UHF or VHF carrier suitable for direct injection into the antenna input of an analog television receiver. RF modulators sit between the source device (VCR, set-top box, DVD player) and the TV, and historically they were implemented as discrete mixer/oscillator chains. The MC44BS373CA family replaced that discrete chain with a fully integrated PLL-synthesized modulator, dropping dozens of components into a single 16-pin SOIC. Within the broader taxonomy, this part is an RF IC -> modulator -> consumer video IC -> semiconductor. Key specifications include a typical TV output level of 82 dBuV at the antenna terminal, I2C control at standard-mode 100 kHz or fast-mode 400 kHz, multi-standard support (B/G, D/K, M/N, L), and a single 5 V supply. The PLL is fully programmable via the serial interface, removing the manual channel-adjustment trimmers that legacy designs required. A bypass mode supports test and modulation-disabled conditions for factory alignment. Architecturally, the MC44BS373CA uses an on-chip PLL frequency synthesizer driven by an external reference resonator, a programmable divider, and a double-balanced mixer that combines the modulated audio subcarrier with the composite video baseband. The result is a low-phase-noise carrier that meets ETSI EN 50083-13 and FCC Part 15 emission masks for consumer TV modulator products. Compared with the legacy MC44BS373/4 family, the MC44BS373CA revision lowers power consumption and provides finer carrier frequency step resolution. Typical applications include VCR RF output stages, satellite and terrestrial set-top box modulators, DVD player composite-to-RF conversion, game consoles, and CCTV/security observation systems that need to feed analog TV monitors. The wide standard coverage allows a single BOM to ship into multiple regional markets, simplifying manufacturing. Designers should note that the part requires a 75 ohm output network and proper shielding to meet conducted and radiated emissions limits. The external reference resonator value determines the carrier frequency step, and any drift in this component directly translates into channel offset on the TV. This page synthesizes distributor pricing, drop-in alternatives, application circuits, and practical design notes not found in the standalone datasheet.
MC44BS374T1AEF - PLL-Tuned UHF/VHF A/V Modulator | NXP
The NXP MC44BS374T1AEF is a PLL-tuned UHF and VHF audio/video high-integration CMOS RF modulator housed in a 16-pin SOIC (Small Outline IC) package. It is a member of the MC44BS373/4 family of legacy modulators and targets NTSC and PAL television output applications such as set-top boxes, DVD players, VCRs, and video surveillance encoders. The modulator integrates a phase-locked loop (PLL) frequency synthesizer, video modulator, audio FM modulator, and I2C-compatible control interface in a single CMOS die. An RF modulator is a transmitter IC that converts a baseband audio and video signal into a vestigial-sideband or double-sideband RF carrier suitable for connection to a television's antenna input. Within the broader product hierarchy, the MC44BS374 sits at: modulator -> RF transmitter -> specialized consumer IC -> integrated circuit -> semiconductor. It is the direct descendant of the legacy MC44BS373/4 family and is functionally superseded by the newer MC44CC373/MC44CC374 CMOS family while retaining the same footprint and electrical interface to ease migration. Key features include programmable UHF/VHF output frequency via the high-speed I2C-compatible bus, a Logic Output Port pin (pin 3) for status or switching functions, 5 V and 3.3 V compatible I2C logic levels, and a TV output level of 82 dBuV (typical, MC44BS374T1A variant) or 75 dBuV (MC44BS374T1 variant). The PLL architecture provides fine channel selection across the broadcast TV band, allowing the modulator to replace traditional saw filters and discrete modulator circuits in cost-sensitive consumer designs. The IC uses a CMOS process with an integrated VCO and PLL loop filter, reducing external component count compared with older bipolar modulator designs. Typical DC supply is 5 V, and the high-speed I2C bus allows full register configuration of audio deviation, video modulation depth, RF output frequency, and power-down mode. The 16-SOIC package is industry-standard and footprint-compatible with the newer MC44CC374 family, simplifying in-place upgrades. Typical applications include set-top box RF outputs, DVD/VCR combo outputs to legacy televisions, video game console A/V-to-RF adapters, security camera RF modulators, and PC TV-capture cards. The Logic Output Port pin can be used to drive an external LED indicator or switch a relay on channel change. The combination of low external parts count and I2C programmability makes this part attractive for high-volume consumer products. When designing with this modulator, pay close attention to the RF output network - use a proper 75 ohm matching network and shielding to meet FCC/CE radiated emissions limits. Decouple VCC with a 10 uF bulk and 100 nF ceramic capacitor placed as close to the IC as possible; inadequate bypassing produces visible hum bars on the modulated video output. This page synthesizes distributor pricing, drop-in alternatives from the same NXP family (MC44BS373T1AEF, MC44CC373T1AEF, MC44CC374T1AEF), and practical design notes that are not aggregated on DigiKey, Mouser, or Octopart product pages.
MC44BS374T1EFR2 - PLL UHF/VHF A/V Modulator, 16-SOIC | NXP
The NXP MC44BS374T1EFR2 is a PLL-tuned UHF and VHF audio/video high-integration modulator housed in a 16-pin SOIC package, supporting both NTSC and PAL broadcast standards. It delivers synthesized RF output across the UHF/VHF bands from a single 5 V supply and integrates the sound subcarrier oscillator, video modulator, and RF upconverter into a single CMOS die. A video modulator is a specialized IC that mixes a baseband composite video signal (with audio subcarrier) up to a channel-frequency RF output suitable for connection to an antenna input of a TV or set-top box. It belongs to the hierarchy of specialized ICs -> interface ICs -> RF/IF signal chain ICs, and historically served consumer video appliances (VCRs, set-top boxes, DVD recorders, video game consoles) before HDMI replaced analog RF distribution. Key features include a wideband PLL allowing flexible channel selection by I2C programming, low intermodulation distortion for clean video reproduction, separate audio and video inputs, and an integrated DC-DC-friendly architecture that minimizes external component count. The device supports both B/G and D/K system variants in the MC44BS374T1/374T1A family and is footprint-compatible with the earlier MC44BC374T1 generation. From an architectural standpoint, the IC uses a fractional-N PLL synthesizer referenced to a low-phase-noise crystal, allowing fine channel resolution while keeping spurious content low. The modulator chain runs at low power and the RF output stage drives 75 ohm loads with a typical output level in the 70-80 dBuV range, suitable for direct connection to receiver antenna inputs. Typical applications include analog-channel output for legacy TVs in set-top boxes, RF modulation for surveillance camera baseband-to-coax distribution, and modulator modules in VCR/DVD-R designs that must output to older receivers without HDMI inputs. When designing with this device, observe the decoupling requirements from the manufacturer datasheet - typically a 100 nF ceramic on each supply pin plus a bulk 10 uF capacitor at the modulator supply input - and route the RF output trace with controlled 75 ohm impedance for clean spectral output. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers sourcing or evaluating the MC44BS374T1EFR2 make confident second-source decisions.
MCP2003BT-H/MC - LIN Transceiver, Integrated Vreg, 8-DFN | Microchip
The Microchip Technology MCP2003BT-H/MC is a stand-alone LIN (Local Interconnect Network) transceiver with an integrated 3.3V or 5.0V voltage regulator, packaged in an 8-pin DFN (2x3 mm) with exposed pad. It provides a bidirectional, half-duplex physical layer interface to LIN bus systems and supports bus speeds up to 20 kbaud (the LIN 2.2A standard). The device meets LIN Bus Specification Revision 2.2, SAE J2602, and ISO 17987, and operates across a wide VBB supply range of 6.0V to 27.0V (continuous), with transient tolerance up to 40V. A LIN transceiver is a specialized interface IC that connects a microcontroller's UART to a single-wire LIN bus used predominantly in automotive body and chassis electronics. It translates CMOS/TTL logic levels on the TXD/RXD pins into the dominant/recessive voltage swings defined by the LIN protocol, and includes the bus-side pull-up, current-limiting, and ESD protection required for harsh 12V vehicle environments. With the addition of an integrated LDO, the MCP2003 family can power the host MCU directly, reducing BOM cost and PCB area in LIN nodes such as door modules, seat controllers, and sensor clusters. Key features include a low standby current of typically 5 µA in Sleep mode, ±8 kV HBM ESD on the LIN pin, thermal shutdown, a permanent dominant bus timeout (TXD and LIN), and a CS/WAKE pin that supports local wake-up. The integrated voltage regulator delivers up to 70 mA (3.3V or 5.0V selectable via the LVA pin), enough for small microcontrollers and sensor conditioning circuits. The exposed pad (EP) on the 8-DFN package provides a low thermal resistance of approximately 38 C/W, enabling robust operation at ambient temperatures up to +150C. The device family is qualified to AEC-Q100 Grade 0 for automotive use (the /H suffix confirms Grade 0 over -40C to +150C). Internally, the transceiver uses a high-side LIN driver and a window comparator for the receiver, providing excellent common-mode rejection and immunity to ground shift between the ECU and the bus. Diagnostic features include bus-fault detection, dominant timeout, and an integrated pull-up on the CS pin for default-on operation. Typical applications include automotive body electronics (door modules, seat controllers, mirror adjusters, window lifters), HVAC control panels, LIN sensor nodes for temperature, pressure, and humidity, industrial CAN/LIN bridges, and appliance control modules. The 8-DFN (2x3) package is well suited to compact PCBs where the small regulator is desired for direct MCU supply. When designing with this part, ensure the VBB input has a reverse-battery blocking diode or protection MOSFET and a bulk capacitor of at least 1 µF close to the pin. The CS pin should be tied to VBB through a 100 kΩ resistor when no MCU wake-up control is needed, and the LIN bus pin requires a 30 pF to 200 pF total bus capacitance per the LIN physical-layer spec.
MCP2120T-I/SL - IrDA Infrared Encoder/Decoder, 14-SOIC | Microchip
The Microchip Technology MCP2120T-I/SL is a low-cost, high-performance, fully-static infrared (IR) encoder/decoder housed in a 14-pin SOIC package with a 2.5 V to 5.5 V single supply. Sitting between a standard UART and an IR optical transceiver, the device encodes UART data into modulated electrical pulses conforming to IrDA Physical Layer Specification version 1.3, supporting baud rates up to 312.5 kbaud at a 20 MHz internal clock. The T-suffix and -I suffix indicate the tape-and-reel packaging and the industrial operating temperature range of -40 °C to +85 °C. An infrared (IR) encoder/decoder is a type of interface IC that bridges a digital UART to an optical transceiver, translating asynchronous serial bytes into IrDA-standard pulse waveforms (typically a 3/16 pulse-width-modulated bit stream at lower baud rates, and a 1.6 µs pulse rate at 115.2 kbaud). It belongs to the wider family of interface ICs, which sit between processor peripherals and external transceivers; within that family it is a specialized serializer/baud-rate adapter for cable-free IR data links rather than a voltage regulator or generic logic gate. Key features include IrDA Physical Layer Specification 1.3 compliance, 312.5 kbaud maximum data rate, CMOS process technology, fully-static operation (no minimum clock restriction), compatibility with any standard UART, and integration with a wide range of IrDA-compliant transceivers. The MCP2120T-I/SL is also designed to interface directly with Microchip's MCP2150 IrDA protocol stack companion and with off-board optoelectronics such as the TFDS4500 / TFDU4100 series IR transceivers. Typical applications include IrDA-compliant data exchange in mobile phones, PDAs, industrial handheld terminals, medical instrumentation, point-of-sale (POS) terminals, remote metering, and any embedded system that needs to add a low-power, cable-free, short-range serial link without the cost of an RF radio module. Designers can replace a heavier or power-hungry optical module with this compact 14-pin solution. When designing with the MCP2120T-I/SL, ensure the UART baud rate is one of the supported IrDA rates (typically 9.6 kbaud to 115.2 kbaud, with the higher speeds selectable via the baud-rate generator). The IR transceiver's TX and RX lines must be properly biased per the transceiver datasheet because the MCP2120T-I/SL only handles the electrical-to-Infrared protocol translation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on stock-search pages or in distributor parameter tables.
MCP2122T-E/SN - IrDA Encoder/Decoder, 115.2 kBd, 8-SOIC | Microchip
The Microchip Technology MCP2122T-E/SN is an infrared (IrDA) encoder/decoder that converts UART bitstreams to IrDA-standard bitstreams and vice versa, supporting baud rates up to 115.2 kBd in an 8-pin SOIC (SN) package with a 1.8V to 5.5V analog supply range. It operates from a 2.5V/3.3V/5V digital supply rail and integrates the bit-stuffing/unstuffing required for IrDA physical-layer compliance. The device is pin-compatible with the Agilent/Avago HSDL-7000, simplifying migration of legacy IrDA designs to a Microchip BOM. Because it requires an external 16x baud-rate reference clock, it eliminates the need for an MCU's baud-rate generator to handle the IrDA bit timing. An IrDA encoder/decoder is a specialized interface IC that sits between a UART (or USART) and an IrDA-compliant optical transceiver. It is a category of wired/wireless bridge IC, often classified as an infrared data link controller. IrDA encoders/decoders fall under Interface ICs, broader Communication/Networking ICs, and ultimately under Integrated Devices and semiconductors. They are essential building blocks for any embedded system that must exchange serial data over infrared light without using an RF radio or cable. Key features of the MCP2122T-E/SN include IrDA Physical Layer Specification version 1.3 compliance, support for SIR (Serial Infrared) data rates up to 115.2 kBd, low standby current, and a wide operating-voltage range that allows battery-powered designs. The chip performs both encode (UART-to-IrDA) and decode (IrDA-to-UART) functions in hardware, removing the host microcontroller's bit-manipulation burden and freeing CPU cycles for application logic. Its small SOIC-8 footprint and tape-and-reel packaging suit high-volume, surface-mount assembly. Architecturally, the MCP2122 is a hardwired state-machine encoder/decoder with a clock-generation block and UART-compatible serial I/O. It implements the IrDA 1.3 physical-layer encoding (3/16 pulse encoding for SIR) without any firmware, which is why it can serve baud rates up to 115.2 kBd with very low host CPU overhead. The chip is paired with an external 38.4 kHz (for 2400 baud) up to 1.8432 MHz (for 115.2 kBd) clock source, typically an MCU timer output or a discrete oscillator. Typical applications include data-logging handhelds, point-of-sale terminals, medical-device infrared data exchange, industrial remote controls, and IrDA dongles for laptops or test equipment. For low-cost wireless serial links where alternative meters exist, the MCP2122 is a mature solution. A key design consideration: the external clock MUST be exactly 16x the target baud rate. Driving the clock from a UART baud-rate generator is the typical pattern; mismatched clocks will produce framing errors and corrupted IrDA frames. This page synthesizes verified distributor pricing, drop-in compatible alternatives, and practical application notes not consolidated on the manufacturer product page.
MCP2200-E/SS - USB 2.0 to UART Bridge with GPIO | Microchip
The Microchip Technology MCP2200-E/SS is a USB 2.0 full-speed to UART serial protocol converter with 8 general-purpose I/O (GPIO) lines, integrated USB termination resistors, and 256 bytes of user-accessible EEPROM, housed in a 20-pin SSOP package. According to the Microchip datasheet 20002228E, the device presents a standard CDC/UART interface to the host PC and adds 8-bit general-purpose I/O plus optional Rx/Tx/CTS/RTS hardware flow control on the serial side, which removes the need for an external MCU solely to handle USB-to-serial bridging. A USB-to-UART bridge IC (also called a USB serial protocol converter) is a category of interface IC that translates USB signaling on the upstream port to a generic asynchronous serial (UART) interface on the downstream side. This role sits inside the broader taxonomy of interface ICs -> communication controllers -> bus bridges -> USB bridges. Bridges like the MCP2200-E are commonly used to add a USB device port to legacy designs that only expose UART, or to provide a virtual COM port for debugging, provisioning, and field firmware updates without rewriting host-side software. Key features include a factory default of 8 GPIO pins configurable as inputs or outputs through HID-class control transfers, 256 bytes of integrated user EEPROM accessible over USB, an internal 3.3V LDO that supplies the USB transceiver from a single external 5V (VBUS) source, support for bus-powered or self-powered operation, and full compliance with USB 2.0 full-speed (12 Mbps). The IC integrates a 48 MHz internal oscillator, pull-up resistor on D+, and the 1.5 kΩ USB termination, simplifying board design to a handful of decoupling caps. Architecturally, the MCP2200-E contains a fixed-function USB 2.0 SIE and a dedicated UART engine, with on-chip RAM buffering transmit and receive FIFOs. The chip implements a vendor HID interface for GPIO and EEPROM access and enumerates as a serial communication class (CDC) device, so no host driver is required on Windows, macOS, or Linux for the CDC portion. Flow control is supported via hardware CTS/RTS pins and an XON/XOFF software mode, and the device presents a standard baud-rate generator from 300 baud up to 1 Mbaud with custom divisors. Typical applications include adding USB connectivity to legacy RS-232 designs, USB-to-UART cables and dongles, debug consoles for embedded MCUs, industrial sensors and instrumentation exposed to a host PC, and embedded products requiring field-update over USB. Developers also use the GPIO bank for tasks like driving status LEDs, reading push buttons, or multiplexing SPI/I2C peripherals through bit-banging. When designing with the MCP2200-E, ensure VBUS bulk capacitance stays at or below 10 µF to meet USB 2.0 inrush-current requirements (per Section 7.2.4 of the USB specification). For self-powered designs, an intentional 1 MΩ pull-down resistor on VBUS and a 10 µF bulk cap are typically recommended for proper line-state detection during attach. Decouple VDD with 1 µF and 0.1 µF ceramics placed close to the SSOP pins. This page synthesises distributor pricing from DigiKey, drop-in alternatives identified from the Microchip same-series cross-reference and competing USB-to-UART bridges, and PCB design notes drawn from the Microchip datasheet and application notes — material you will not find in any single datasheet PDF.
MCP2200-E/SS - USB 2.0 to UART Bridge, 12 Mbps, 20-SSOP | Microchip
The Microchip Technology MCP2200-E/SS is a USB 2.0 full-speed to UART protocol converter with integrated USB termination resistors, eight general-purpose I/O (GPIO) pins, and 256 bytes of user-configurable EEPROM, housed in a 20-pin SSOP (5.30 mm body) package. The device supports data rates from 300 baud up to 1 Mbaud, supplies a 3.3 V LDO output from the internal 5 V-to-3.3 V regulator, and operates across an industrial -40 °C to +85 °C temperature range. It provides a true drop-in USB connectivity path for legacy UART peripherals (RS-232, RS-485, MCU debug ports, sensors) without the cost or footprint of an external MCU plus USB PHY stack. A USB-to-UART bridge is a category of bus converter that translates between USB device-class framing and asynchronous serial frames. The MCP2200 sits at the protocol-converter layer of a USB peripheral, just above the physical transceiver (which is integrated on-chip), and presents a CDC virtual COM port to the host operating system so that the existing UART firmware on a target MCU can communicate unmodified. The hypernym hierarchy is: USB-to-UART bridge -> protocol converter -> interface IC -> integrated circuit -> semiconductor. Key features include integrated USB 2.0 full-speed transceiver (12 Mbps), on-chip 3.3 V LDO with up to 50 mA external load capability, suspend/resume signaling through the SSPND pin, configurable flow control (XON/XOFF, RTS/CTS), and a built-in bootloader for in-field firmware updates of the MCP2200's internal configuration via the host. The 256-byte EEPROM stores VID, PID, manufacturer string, product string, serial number, GPIO defaults, and the baud-rate divisor table. The MCP2200 architecture pairs a USB 2.0 SIE (Serial Interface Engine) and a dedicated UART engine through a small configuration memory block accessible over the USB control endpoint. Driver support is provided through Microchip's virtual COM port (VCP) drivers for Windows, macOS, and Linux, plus the MCP2200 Configuration Utility for EEPROM programming. Because the host sees a CDC device, no custom driver is required on the application side. Typical applications include industrial sensor-to-USB bridges, point-of-sale terminals, debug console expansion for MCU development boards, USB dongles for legacy RS-232 equipment, and isolated UART-over-USB adapters. The wide baud-rate range makes the part equally suitable for legacy 9600 baud sensor protocols and high-throughput 921 600 baud FPGA/JTAG console links. When designing with this device, place a 100 nF decoupling capacitor close to VUSB and a 4.7 µF bulk capacitor on the VBUS sense line; the on-chip LDO requires an external 1 µF to 4.7 µF capacitor on the 3V3 pin. Maintain a 90 Ω differential impedance on the D+/D- pair to preserve USB signal integrity, and keep the SSPND trace short to avoid false suspend events. This page synthesizes distributor pricing, drop-in and functional alternatives, and practical design notes beyond the manufacturer's datasheet, including pinout mapping, GPIO default state behavior, and host-driver deployment guidance.
MCP2200-I - USB-to-UART Bridge, 20-SOIC | Microchip Technology
The Microchip Technology MCP2200-I is a USB 2.0 to UART protocol converter with GPIO, integrating a USB transceiver, oscillator, and termination resistors into a single 20-pin SOIC package. Designed as a drop-in replacement for legacy RS-232 designs, it converts USB signals to a standard UART interface at data rates up to 1 Mbaud, while exposing eight configurable GPIO pins for LEDs, pushbuttons, or auxiliary logic. The device operates over an industrial -40C to +85C temperature range. A USB-to-UART bridge is a protocol converter that allows microcontrollers, sensors, and legacy UART peripherals to communicate over a modern USB host. In the broader hierarchy it sits between USB class controllers (CDC) and UART transceivers (RS-232/RS-485 line drivers), absorbing the USB protocol stack entirely on-chip so the host MCU needs no firmware-side USB stack. Bridges like the MCP2200-I therefore appear in the BOM wherever an MCU lacks native USB (e.g. low-cost PIC, AVR, 8051 designs) or where a product must add a diagnostic / firmware-update COM port to an existing board. Key features of the MCP2200-I include: integrated 12 Mbps USB 2.0 full-speed transceiver; configurable baud rate from 300 baud to 1 Mbaud; eight GP inputs/outputs; on-chip 3.3V LDO for internal logic and up to ~50 mA of external load; hardware suspend/resume support; and a dedicated SSPND pin for power management. The device enumerates as a CDC ACM class device, so on Windows, macOS, and Linux it shows up as a virtual COM port with no custom driver required. Internal EEPROM configurable via the host allows customization of VID, PID, manufacturer string, and GPIO defaults. Typical applications are USB-to-serial debug / firmware-update ports on PIC and AVR development boards, industrial sensor nodes that stream UART telemetry to a PC, point-of-sale terminals, USB dongles for legacy equipment, and embedded hobbyist designs (Arduino, PIC development kits). When designing with the MCP2200-I, ensure a stable 5V VBUS rail, place the 0.1 uF decoupling capacitor directly on VDD, and respect the 0.5 mA pull-up current budget on each GPIO. Because it is USB-powered, surge and ESD protection on VBUS and the data lines is recommended for harsh environments.
MCP2200-I-MQVAO - USB 2.0 to UART Converter | Microchip
The Microchip Technology MCP2200-I-MQVAO is a USB 2.0 to UART protocol converter with integrated GPIO, delivered in a 20-pin VQFN (5x5 mm) package with exposed pad. It bridges a standard UART interface to a full-speed USB 2.0 connection and enumerates as a Human Interface Device (HID), eliminating the need for custom kernel drivers on the host PC. A USB-to-UART bridge is a category of interface IC (part of the broader USB bridge / serial converter family) that translates USB packet traffic into a simple asynchronous serial stream. These devices let legacy UART-based microcontrollers, sensors, and modules communicate with modern computers that no longer expose physical serial ports, forming a key layer between embedded systems and host-side software in the interface IC hierarchy. Key features include integrated USB termination resistors, which reduce the external bill of materials by removing the need for discrete pull-up and termination components; 256 bytes of on-chip user EEPROM for storing custom VID/PID and configuration data; and four general-purpose I/O pins that can be toggled by the host for status LEDs, resets, or mode control. Microchip supplies a DLL and configuration utility, so I/O control and device setup require no firmware development on the converter itself. Architecturally, the MCP2200 handles USB enumeration, endpoint management, and packet-to-byte translation autonomously, appearing to the host as a standard HID-class device. Because HID drivers are built into Windows, Linux, and macOS, deployment is driverless. The UART side operates with standard asynchronous framing, and the device supports baud rate configuration via the Microchip configuration tool. Typical applications include adding USB connectivity to MCU boards that only expose UART, debug consoles for embedded Linux and FPGA boards, factory automation and point-of-sale equipment, and configuration interfaces for industrial sensors. The 20-VQFN footprint suits compact designs where board area is limited. Design consideration: the MCP2200 enumerates as HID rather than CDC/ACM (virtual COM port), so host software must speak the Microchip HID protocol or use the supplied DLL rather than a standard serial port API; plan the PC-side software stack accordingly. This page adds value beyond the manufacturer datasheet by consolidating distributor availability, drop-in alternative analysis, comparison tables, and practical design notes in one place.
MCP2200-I-SS - USB 2.0 to UART Converter, 8 GPIO | Microchip
The Microchip Technology MCP2200-I/SS is a USB 2.0 to UART protocol converter with 8 general-purpose I/O pins and 256 bytes of integrated EEPROM, housed in a 20-lead SSOP (SS) package with an industrial temperature rating of -40C to +85C. A USB-to-UART bridge is a type of interface IC that sits between a host PC's USB port and a microcontroller or system UART. In the product hierarchy, it belongs to the USB bridge controller family within interface ICs and serial communication devices. Its role is to translate USB full-speed packets into asynchronous serial data, letting legacy UART-based designs gain USB connectivity without firmware changes, appearing to the host as a virtual COM port. Key features include full-speed USB 2.0 compliance, integrated USB termination resistors that reduce the external BOM, hardware flow control via RTS/CTS, and 8 GPIO pins configurable through vendor software or EEPROM defaults. The 256-byte on-chip EEPROM stores VID/PID, product strings and power parameters, allowing custom USB identities without external memory. Technically, the MCP2200 uses CMOS technology, integrates the USB transceiver and a 3.3V/5V-tolerant interface, and enumerates on the host using a virtual COM port driver supplied by Microchip for Windows, Linux and macOS. The UART interface connects directly to an MCU's TX/RX pins, while configuration utilities allow GPIO direction, polarity and EEPROM values to be set at runtime. Typical applications include adding USB connectivity to embedded MCU boards, industrial equipment service ports, point-of-sale terminals, and PC-based instrument front ends where a UART link with a few extra control lines is needed. A key design consideration is that the MCP2200's baud rate range and buffer sizes must be checked against your MCU link, and USB bus power budgeting should follow the values programmed in the EEPROM. There is no true pin-to-pin drop-in replacement in the same 20-SSOP footprint from other vendors, so second sources require board changes. This page synthesizes distributor pricing, alternative strategies, and practical design notes not found in the manufacturer datasheet.
MCP2200T-I - USB 2.0 to UART Converter with GPIO | Microchip
The Microchip Technology MCP2200T-I is a USB 2.0 full-speed to UART protocol converter with 8 general-purpose I/O pins, a 256-byte integrated EEPROM, and integrated USB termination resistors, operating from a 3.0 V to 5.5 V supply in a 20-pin SOIC package (tape and reel, industrial temperature range). A USB-to-UART bridge is a type of interface controller that converts USB traffic into standard asynchronous serial (UART) data, allowing any microcontroller or system with a UART port to communicate with a modern USB host. Within the system hierarchy, it sits between the USB physical layer and the application MCU serial port, and belongs to the broader family of USB interface ICs and communication controllers. Key features include full-speed USB 2.0 (12 Mbps) connectivity, a 128-byte transmit buffer that decouples UART timing from USB traffic, and eight GPIO pins that can be reconfigured for functions such as USBCFG, SUSPEND, LED control, and RESET_CFG. The integrated 256-byte EEPROM stores custom VID/PID and configuration descriptors, eliminating external serial EEPROM and reducing bill-of-material cost. Integrated USB termination resistors further remove the need for two external resistors. The device uses CMOS technology and implements the USB protocol entirely in hardware, so no firmware development is required on the host side beyond the vendor-provided virtual COM port driver. Flow-control related handshaking signals (RTS, DTR, DCD, RI) are exposed for legacy serial emulation. Typical applications include adding USB connectivity to embedded systems with a UART interface, USB-to-serial adapters, industrial equipment service ports, and IoT device commissioning links. The wide 3.0-5.5 V supply range makes it compatible with both 3.3 V and 5 V logic systems. Design consideration: keep the UART baud rate within the device-supported range and account for the transmit buffer depth when streaming continuous data at high baud rates, since the bridge is not a zero-latency pipe. This page synthesizes distributor pricing, drop-in alternatives, pinout guidance, and practical design notes not found in the manufacturer datasheet.
MCP2210T-I/SS - USB-to-SPI Bridge, 9 GPIO, SSOP-20 | Microchip
The Microchip Technology MCP2210T-I/SS is a USB-to-SPI Master protocol converter with GPIO, housed in a 20-pin SSOP package. It integrates a full-speed USB 2.0 interface, an SPI master controller, 256 bytes of user-accessible EEPROM, and nine configurable GPIO pins, enabling rapid USB connectivity for embedded systems that already include an SPI peripheral but lack a native USB port. The operating voltage range is 3.3 V to 5.5 V and the device supports SPI bus speeds up to 12 MHz. A USB bridge IC, also called a USB-to-SPI protocol converter, is a bridge device that sits between a USB host (typically a PC or embedded processor acting as USB device) and an external SPI slave. It eliminates the need for a dedicated microcontroller with a USB device stack, dramatically reducing firmware complexity. Within the broader hierarchy, the MCP2210 is a USB interface IC -> bridge converter -> USB controller -> interface IC -> integrated circuit. Key features include programmable SPI clock up to 12 MHz, chip select lines that can be mapped to dedicated or GPIO pins, support for USB Suspend/Resume, and a built-in 256-byte EEPROM for storing user configuration such as VID, PID, manufacturer string, and GPIO defaults. The integrated USB termination resistors and on-chip 3.3 V LDO further reduce external component count. The device presents itself to the host as a USB Human Interface Device (HID) class, which means no custom host driver is required on Windows, macOS, or Linux. The Microchip MCP2210 Utility and the cross-platform MCP2210 Library (with .NET, Python, and C bindings) allow immediate SPI bus access from PC applications, accelerating prototyping of test fixtures and lab instrumentation. Typical applications include USB-to-SPI adapters for programming flash memories and microcontrollers without native USB, industrial sensor interface bridges, lab automation and test equipment front-ends, embedded development boards, and home-brew or hobbyist SPI debuggers that expose SPI peripherals over USB. The on-board GPIOs also let designers implement control signals such as reset, boot-mode selection, or LED indicators without an additional IO expander. When designing with the MCP2210T-I/SS, place the USB DP/DN traces as a 90 ohm differential pair routed directly to the USB connector, keep the VBUS sense line intact for proper attach detection, and observe the SSOP-20 thermal pad (if present) for reflow. Decoupling should include a 4.7 uF bulk capacitor plus a 0.1 uF ceramic close to the VDD pin. This page synthesizes Microchip datasheet specifications, distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.
MCP2221-I/ST - USB 2.0 to I2C/UART Bridge with GPIO | Microchip
The Microchip Technology MCP2221-I/ST is a USB 2.0 full-speed device-to-I2C/UART protocol converter with 4 GPIO pins, integrated in a 14-pin TSSOP (ST) package. It connects a USB host (PC or embedded controller) to downstream I2C, SMBus, or asynchronous serial (UART) peripherals, and exposes four general-purpose I/O signals plus a configurable clock output, eliminating the need for an external MCU on small sensor or human-interface nodes. The part operates from a single 3.0V to 5.5V supply and uses an internal oscillator plus the integrated USB transciever, so no external crystal is required. A USB bridge IC is a category of interface controller that converts between USB and a slower peripheral bus (UART, I2C, SPI). The device sits downstream of the USB PHY and upstream of the application processor or sensor cluster, presenting a HID-class or vendor-class interface to the host OS so that no custom driver is required on Windows, macOS, or Linux. Within the broader taxonomy, an interface bridge belongs to the Interface ICs family of integrated circuits, alongside I/O expanders, UART transceivers, and USB controllers. The MCP2221-I/ST highlights 12 Mbps USB full-speed, a programmable I2C controller that supports Standard-mode (100 kHz), Fast-mode (400 kHz), and Fast-mode Plus (1 MHz), a UART supporting 300 to 115200 baud, 64-byte transmit and receive FIFO buffers, and 4 GPIOs that can be individually mapped to dedicated digital functions. A factory-programmed USB VID/PID and the Microchip HID-based configuration DLL allow the device to enumerate as a standard HID, requiring no driver install on modern hosts. Typical applications include USB-to-I2C sensor dongles, USB-to-UART debug bridges that replace legacy RS-232 ports, HID-based EEPROM/flash programming fixtures, breadboard prototyping platforms (Arduino-style native-USB boards), industrial configuration and diagnostic ports, and PC-side emulators for I2C peripheral evaluation. The TSSOP-14 footprint is friendly to hand-soldering, which is why the part remains popular in hobbyist and low-volume production designs. When designing with this device, observe USB-IF bus-layout rules: keep the D+/D- traces length-matched within 2 mm, place the VBUS decoupling capacitor within 3 mm of the VBUS pin, and provide a 1 uF bulk capacitor on the internal 3.3V LDO output. Avoid routing the I2C lines through noisy switching-regulator regions because the internal pull-ups are weak and intended only for low-speed evaluation. This page synthesizes current distributor stock, parametric drop-in alternatives, and practical PCB-layout notes drawn from the Microchip datasheet, providing information not found in any single distributor product listing.
MCP23017-E/ML - 16-bit I2C I/O Expander, 28-QFN (6x6) | Microchip
The Microchip Technology MCP23017-E/ML is a 16-bit, general-purpose bidirectional I/O expander that communicates over the I2C serial interface at speeds up to 1.7 MHz, housed in a 28-pin QFN (ML) 6x6 mm package. It operates from 1.8 V to 5.5 V supply, provides 16 individually configurable I/O pins organized into two 8-bit ports (GPA and GPB), and supports cascading of up to eight devices on a single I2C bus through three hardware address pins (A0, A1, A2), giving a theoretical maximum of 128 GPIOs per bus. An I/O expander, also called a GPIO expander, is a category of digital interface IC used to add additional general-purpose input/output pins to a microcontroller or processor whose native GPIO count is insufficient. The MCP23017 belongs to the broader I2C peripheral and interface IC family, sitting architecturally between a host MCU and end loads such as LEDs, keypads, sensors, and relays. Because the device communicates over a two-wire I2C bus, it consumes only two host pins regardless of how many expanders are chained, which is critical for pin-constrained designs. Key features include interrupt-on-change capability on each pin (configurable per pin via IOCON), hardware configurable interrupt output polarity, internal weak pull-up resistors (100 kOhm typical), 25 mA sink/source capability per pin, and a low standby current of 1 uA typical. The MCP23017 also offers two interrupt pins (INTA and INTB) that can be mirrored or routed independently, supporting both level-sensitive and edge-triggered wake-up events to the host controller. The MCP23017 uses a parallel architecture where the I2C core and the GPIO register bank are independent, allowing the host to write all 16 outputs in a single transaction through sequential register addressing. Configuration registers (IODIR, IPOL, GPPU, GPIO, OLAT, IOCON) are mirrored for ports A and B, simplifying firmware by enabling port-level operations. The device supports standard I2C (100 kHz), fast I2C (400 kHz), and high-speed I2C (1.7 MHz), the latter being unique to Microchip's MCP23X17 family. Typical applications include adding keypads or LED matrices to home appliances, expanding GPIO on Raspberry Pi or ESP32 projects, industrial PLCs requiring many isolated inputs, automotive dashboard controls, and any design where pin count exceeds the MCU's native capability. The MCP23017-E/ML variant carries the -E (Extended) temperature grade of -40C to +125C. When designing with this device, ensure external I2C pull-ups are sized correctly for the bus capacitance and selected speed; the internal weak pull-ups are insufficient for reliable high-speed operation. For applications exceeding eight expanders, use the SPI variant MCP23S17 instead. Reserve the three address pins (A0/A1/A2) carefully to avoid bus address collisions. This page synthesizes distributor pricing from LCSC and DigiKey, drop-in alternative MPNs sourced from Microchip's same family and verified cross-references, and practical design notes covering I2C pull-up sizing and interrupt handling not consolidated in the manufacturer datasheet alone.
MCP23017-E/SS 16-Bit 1.7MHz I2C GPIO Expander | Microchip
The Microchip Technology MCP23017-E/SS is a 16-bit general-purpose I/O expander with a 1.7 MHz I2C interface, 16 bidirectional GPIO pins, and a 28-SSOP package. It operates from 1.8 V to 5.5 V and supports 100 kHz, 400 kHz, and 1.7 MHz I2C operation. The device adds configurable digital input or output capability to a host controller while reducing the number of direct GPIO connections required. An I/O expander is an interface IC that translates serial bus commands into parallel digital signals. The MCP23017-E/SS belongs to the I/O expander class, which sits between a host microcontroller and external peripherals. Its two 8-bit ports can be programmed individually as inputs or outputs, while configuration registers control polarity, interrupts, and direction. This makes the device useful for button matrices, relays, indicators, sensors, and other digital loads. The MCP23017-E/SS provides 16 I/O pins, interrupt output, and an address-selection mechanism through hardware address pins. The I2C interface supports standard and fast modes identified in the verified data as 100 kHz, 400 kHz, and 1.7 MHz. Its operating voltage range of 1.8 V to 5.5 V allows use in both 1.8 V and 5 V systems, although external logic levels must match the connected bus and peripherals. The MCP23017 and MCP23S17 device family is architecturally similar, but the verified manufacturer description distinguishes the MCP23017 as the I2C version and MCP23S17 as the SPI version. The MCP23017-E/SS is therefore appropriate when the system already uses I2C and needs multiple independently configurable GPIO lines. It is not a direct SPI replacement without software and interface changes. Typical applications include industrial control panels, embedded systems, IoT controllers, keypad interfaces, relay boards, digital sensor aggregation, and compact automation products. The I2C connection reduces wiring compared with sixteen direct MCU pins, while the 16 available I/O lines provide more control and monitoring points than a basic 8-bit expander. A key design consideration is bus wiring. Place pull-up resistors on SDA and SCL according to the host voltage, I2C bus capacitance, and operating speed. Confirm the selected address, keep the address pins at valid logic levels before reset release, and account for input leakage, output drive, interrupt polarity, and the electrical limits of attached loads. Use the manufacturer datasheet for exact register behavior, timing, and absolute maximum ratings. This page combines verified manufacturer and distributor information with practical selection context for MCP23017-E/SS users. It clarifies the 16-bit GPIO architecture, 1.8 V to 5.5 V supply range, 1.7 MHz interface capability, package choice, and design considerations that are essential when embedding the device in a new I2C-based control system.
MCP23017T-E/SS - 16-Bit I2C I/O Expander | Microchip
The Microchip Technology MCP23017T-E/SS is a 16-bit general-purpose parallel I/O expander with an I2C interface, a maximum clock frequency of 1.7 MHz, and a 28-pin SSOP package. It operates from a 1.8 V to 5.5 V supply across a -40°C to +125°C temperature range, providing flexible interfacing between a host microcontroller and external digital circuits. An I/O expander is an interface IC that increases the number of digital input and output pins available to a host processor. The MCP23017 divides its 16 external lines into two 8-bit ports, GPA0-GPA7 and GPB0-GPB7, and transfers port data through a serial bus. This reduces the host's pin count while preserving individual control of switches, indicators, sensors, and other digital loads. Key verified features include 16 I/O lines, I2C operation up to 1.7 MHz, seven address pins supporting device cascading and address extension, an interrupt output, and a reset function. The JLCPCB product listing reports approximately 1 µA quiescent current, 600 mV and 8 mA values, and a RoHS-compliant SSOP-28 device; the exact meaning and test conditions of the 600 mV and 8 mA entries must be confirmed in the manufacturer datasheet. The MCP23017 is programmed through banked registers containing I/O direction, polarity, pull-up, interrupt-on-change, default, and port data functions. According to the manufacturer family documentation, the MCP23017 uses I2C while the MCP23S17 uses SPI. This distinction is important when replacing one family member with another because the serial protocols are not interchangeable. Typical uses include industrial control panels, keypad scanning, relay or LED interface boards, sensor aggregation, and embedded systems requiring more GPIO than the host controller provides. The wide supply range supports both modern low-voltage systems and established 5 V designs, while the extended temperature range enables industrial equipment. Designers should confirm the exact 28-pin pinout, open-drain interrupt behavior, address selection, and electrical limits against the manufacturer datasheet before layout release. PCB traces should keep I2C routing short, use appropriate pull-up resistors, and provide decoupling near the supply pins. Firmware must initialize every direction and configuration register explicitly because reset defaults do not necessarily match the intended board behavior. This page consolidates verified manufacturer and distributor information, package details, application guidance, and replacement considerations beyond a basic catalog listing.
MCP23S17-E/SO - 16-bit SPI I/O Expander, 10MHz | Microchip
The Microchip Technology MCP23S17-E/SO is a 16-bit, general-purpose, bidirectional parallel I/O expander controlled via a high-speed SPI serial interface (10 MHz max) and housed in a 28-pin wide-body SOIC package. The device operates from a single 1.8V to 5.5V supply, provides 16 GPIO pins configurable as inputs or outputs in two 8-bit ports (GPA0-GPA7, GPB0-GPB7), and supports interrupt-on-change with a dedicated INTA/INTB output wire-OR capability. An I/O expander is a category of bridge IC that converts a low-pin-count serial bus (SPI, I2C) into a parallel GPIO bus. In the system hierarchy, I/O expanders sit between a host microcontroller and peripheral switches, sensors, LEDs or relays, off-loading pin-intensive tasks so smaller, cheaper MCUs can be used. The MCP23S17 belongs to the interface IC family and shares a register model with the I2C sibling MCP23017, so firmware written for one can be ported with minimal changes. Key features of the MCP23S17-E/SO include 25 mA per-pin sink/source capability (total package limit 200 mA), 100 kHz / 400 kHz / 1 MHz configurable internal pull-ups, hardware-address pins (A0/A1/A2) for up to eight devices on one SPI bus (128 I/O total), sequential operation mode for daisy-chained SPI bursts, and an operating temperature range of -40C to +125C suitable for industrial environments. Technically the device integrates input polarity inversion, configurable interrupt-on-change for rising/falling edges on either port, and an open-drain interrupt output. Each GPIO can be set independently to input, output, or input-with-pullup, and the two ports (A/B) can be addressed separately or together in IOCON.BANK mode. Typical applications include industrial PLC I/O modules, key-matrix and LED-driving front panels for white goods and printers, expansion headers for Raspberry Pi/Arduino-class boards, and 7-segment/14-segment display multiplexing. Pairing the MCP23S17 with a low-cost MCU like the PIC16F or ATtiny lets designers add a 16-bit bus at minimal BOM cost and ~2 mA active supply current. Design consideration: provide at least 100 nF decoupling close to VDD and reserve the RESET pin (active-low) with a 10 kohm pull-up to ensure clean POR behavior. When daisy-chaining via the SEQOP/OSC bits, ensure the SPI master clocks remain within the 10 MHz maximum to avoid GPIO state corruption. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
MCP23S17-E/SS - 16-bit SPI I/O Expander 10MHz 28-SSOP | Microchip
The Microchip Technology MCP23S17-E/SS is a 16-bit general-purpose parallel I/O expander with an SPI serial interface, operating at clock frequencies up to 10 MHz and housed in a 28-pin SSOP (5.30 mm body) package. It operates from a wide supply voltage range of 1.8 V to 5.5 V across the industrial temperature range of -40 °C to +125 °C, and provides 4 kV ESD protection on I/O pins. An I/O expander (or GPIO expander) is a peripheral IC that adds general-purpose input/output lines to a host microcontroller through a low-pin-count serial bus such as SPI or I²C. The I/O expander sits in the connectivity / interface IC hierarchy: GPIO expander -> I/O expander -> interface IC -> peripheral IC -> integrated circuit. By offloading up to 16 GPIO to a separate chip, designers keep host MCUs small and inexpensive while still controlling relays, keypads, LEDs, sensors, and segment displays. Key features of the MCP23S17 include 16 individually configurable bidirectional I/O lines, two interrupt outputs (INTA and INTB) that can be mirrored or linked, hardware-address pins that allow up to eight devices on a single SPI bus (128 GPIOs total), configurable internal pull-up resistors per pin, and sequential or byte-mode register access for fast throughput. The interrupt output feature lets the host sleep until a defined edge event occurs, reducing average system power. The device uses a simple 8-bit command word followed by a register address and data, allowing reads and writes to all 22 internal registers. Its 10 MHz SPI clock supports rapid update of many I/O lines, while the cascading-address scheme (A0/A1/A2 + banked IOCON.HAEN) lets eight MCP23S17 chips share one CS line, expanding a single SPI peripheral into 128 GPIO. The internal architecture combines a robust CMOS I/O structure with hardware interrupts, making the part well suited to industrial field wiring. Typical applications include LED signage and keypad interfacing, industrial control and PLC signal conditioning, multi-segment LCD/segment-display drivers via shift-register style cascading, home appliance user interfaces, and any MCU-limited design that needs more GPIO than the host package offers. The wide 1.8 V to 5.5 V supply range lets the same part work with 3.3 V MCUs and 5 V logic boards alike. When designing with the MCP23S17, place a 0.1 µF decoupling capacitor close to VDD and consider the SSOP-28 thermal pad layout. The RESET pin should be pulled high through a 10 kΩ resistor or controlled by the host to put all registers into a defined state at power-up. This page synthesizes distributor pricing, drop-in alternatives and practical design notes not found in the standalone Microchip datasheet.
MCP23S17T-E/SS - 16-Bit SPI I/O Expander, 10 MHz, SSOP-28
The Microchip MCP23S17T-E/SS is a 16-bit general-purpose parallel I/O expander with an SPI serial interface, housed in a 28-pin SSOP package and rated for 5.5 V operation at 10 MHz serial clock. The MCP23S17 device family provides 16-bit, general purpose parallel I/O expansion for SPI applications, communicating with a host controller over a standard SPI bus and exposing two 8-bit ports (GPA and GPB) configurable as input or output. An I/O expander is a type of interface IC that sits between a host microcontroller and external peripherals or discrete signals, allowing a small MCU with limited native GPIO to control far more lines than its package allows. The MCP23S17 belongs to the I/O expander category (a sub-class of interface ICs), itself a sibling of the I2C-based MCP23017; both devices share identical pinout and register map, differing only in the serial protocol. This hierarchical placement — I/O expander -> interface IC -> peripheral IC -> semiconductor — lets the device act as a transparent extension of the host bus. Key features include 16 individually configurable I/O lines, hardware configurable slave address via three external pins (up to eight devices on one SPI bus), 25 mA sink/source capability per pin, internal pull-up resistors (100 kΩ typical) user-enabled per pin, and a configurable interrupt output with open-drain behavior. The MCP23S17T-E/SS also provides sequential or simultaneous port update, polarity inversion register, and an input latch register for capturing transient events between SPI reads. The architecture combines a CMOS SPI slave controller with two 8-bit bidirectional ports, each backed by latches for direction, polarity, pull-up, and interrupt control. The device operates from a single 1.8 V to 5.5 V supply, integrating level translation and ESD protection per pin (per JESD22-A114, HBM 2 kV typical per Microchip qualification). The wide supply tolerance lets it interface directly with both 3.3 V and 5 V MCUs without external level shifters. Typical applications include adding keypad and matrix-scan inputs to consumer appliances, expanding relay and signal-lamp drive in industrial controllers, multiplexing LCD segment or LED driver lines in embedded displays, and providing auxiliary GPIO to small-form-factor MCUs such as the PIC16 or low-pin-count STM32 devices. The /SS (SPI slave-select) line allows up to eight MCP23S17 devices on a single SPI bus, yielding 128 I/O lines per controller. When designing with this part, place 0.1 µF decoupling close to VDD/VSS, enable the internal pull-ups for input switches to suppress noise, and verify the SPI mode (CPOL/CPHA) and clock rate against the MCU. Reset is not required but tying RESET high via a 10 kΩ pull-up ensures clean startup. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, providing a single reference for engineers and procurement teams evaluating the MCP23S17T-E/SS.
MCP23S18-E/MJ - 16-Bit SPI I/O Expander, 10 MHz, QFN-24 | Microchip
The Microchip Technology MCP23S18-E/MJ is a 16-bit, general-purpose, parallel I/O expansion device for high-speed SPI-bus applications, housed in a 24-pin QFN (4x4) package. The device delivers up to 10 MHz SPI clock frequency and operates from a 1.8 V to 5.5 V supply, supporting both 3.3 V and 5 V logic systems. Each of the 16 GPIO pins can be independently configured as input or output, with interrupt-on-change capability and programmable pull-up resistors. What is an I/O expander? An I/O expander is a peripheral IC that adds general-purpose input/output pins to a microcontroller or processor through a serial bus (I2C or SPI). The I/O expander sits in the interface IC hierarchy between GPIO controllers and bus drivers, and belongs to the broader power management and interface ecosystem. By externalizing GPIO, designers reduce host pin count, free up small-form-factor MCUs for more analog or timer peripherals, and consolidate LEDs, buttons, relays, and keypads onto one addressable bus. The MCP23S18 uses an SPI interface (MCP23018 is the I2C sibling in the same family). It contains 22 byte-wide registers: 8-bit configuration, input, output, polarity inversion, pull-up, interrupt, and masking registers. Two address pins (A0, A1, A2) allow up to eight devices on the same SPI bus, expanding to 128 GPIO per bus. The interrupt output (INT) and configurable INT pin polarity simplify change-detection without polling. Key features include open-drain outputs (per datasheet), hardware/software addressable slave, interrupt-on-change per pin, programmable internal pull-ups (100 kΩ typical), and cascadable architecture. The QFN-24 (4x4 mm) package supports compact designs and the industrial -40C to +125C operating range. Typical applications include LED driving and key scanning in consumer electronics, industrial control panel GPIO expansion, sensor hub aggregation, and microcontroller pin-count extension in IoT edge nodes. The wide 1.8 V–5.5 V supply range makes it compatible with both 1.8 V SoCs and legacy 5 V logic. When designing with this part, place a 0.1 µF decoupling capacitor close to VDD and observe SPI bus pull-ups for reliable communication at 10 MHz. The device address is hardware-strapped via A0–A2 pins, eliminating firmware conflicts on multi-device buses. This page consolidates distributor pricing, drop-in equivalents, and practical design considerations not assembled in the manufacturer datasheet, helping engineers evaluate the MCP23S18-E/MJ for new designs and second-source scenarios.
MCP25020-I/SL - CAN V2.0B I/O Expander, 8 I/O, 1 Mb/s | Microchip
The Microchip Technology MCP25020-I/SL is a digital CAN (Controller Area Network) input/output expander that supports CAN V2.0B active with bus rates up to 1 Mb/s, housed in a 14-pin SOIC (SL) 150-mil package. The device integrates a configurable CAN bus interface with up to 8 user-programmable digital I/O lines and up to 2 PWM outputs, allowing a host MCU to extend its I/O count across a CAN bus without adding wiring complexity. Operating from a 3.3V or 5V supply, the MCP25020 is designed as a companion to a CAN-equipped microcontroller in distributed automotive, industrial, and building-automation systems. A CAN I/O Expander is a specialized mixed-signal interface IC that sits on a CAN bus as a remote node, exposing digital I/O to the bus master. In the broader taxonomy it is a member of the CAN controller / transceiver family, which itself sits inside the Interface ICs category and ultimately under Integrated Circuits. The expander allows a central ECU or PLC to read sensors and drive actuators over the same differential CAN pair that carries the main control traffic, dramatically reducing harness complexity. This places the MCP25020 in the same functional neighborhood as digital IO expanders (I2C/SPI types such as MCP23017), but with the long-distance and EMC advantages of a CAN physical layer. Key features of the MCP25020 include CAN V2.0B active compliance at up to 1 Mb/s, 8 configurable digital I/O channels, 2 PWM outputs, internal oscillator at 25 MHz, low-power sleep mode, and industrial temperature range of -40C to +85C. The 14-SOIC package is a narrow-body, surface-mount format that drops into standard hand-solderable footprints and supports wave or reflow manufacturing. Together these features target applications where a small MCU plus a CAN I/O extender can replace a larger, more expensive controller with custom firmware. The MCP25020 is built around Microchip's CAN peripheral engine plus configurable digital logic. The CAN engine handles protocol framing, bit stuffing, CRC, and error handling, while the device configuration is normally stored in on-chip EEPROM-style registers that the host MCU programs at boot. This split architecture lets the system integrator treat the MCP25020 as a 'remote digital IO card on a CAN bus' rather than a fully programmable microcontroller, simplifying firmware development and safety certification. Typical applications include automotive body controllers, industrial sensor/actuator nodes, building-automation I/O modules, agricultural machinery controllers, and any distributed system where CAN is already present. Because the device operates over the differential CAN bus, it is naturally immune to the ground-shift and EMI issues that plague single-ended remote I/O. The 1 Mb/s bus rate also keeps loop times short enough for closed-loop control. When designing with the MCP25020, ensure the bus termination (typically 120 ohm at each end of the CAN segment) and stub length follow ISO 11898 guidance, and use a TVS diode such as the SM24CANB on the bus pins for ESD and transient protection. A small LC filter on VDD plus a local 100 nF decoupling capacitor is recommended to keep the internal oscillator clean in noisy automotive environments. This page synthesizes distributor pricing, parametric alternatives in the same SOIC-14 footprint, and practical design notes not found in the manufacturer datasheet alone.
MCP2515-I/P - CAN 2.0B SPI Standalone CAN Controller | Microchip
The Microchip Technology MCP2515-I/P is a stand-alone Controller Area Network (CAN) controller that implements the CAN 2.0B specification, providing full CAN bus connectivity to microcontrollers that lack an integrated CAN peripheral. Housed in a 18-pin PDIP (P) through-hole package, the part features an industrial-grade operating range of -40C to +85C, an SPI host interface up to 10 MHz, and includes integrated acceptance masks (2) and filters (6) for hardware message filtering. What is a CAN controller? A CAN controller is a serial communications device implementing the ISO 11898 Controller Area Network protocol used in automotive, industrial automation, and embedded systems. The MCP2515 sits in the hierarchy: CAN controller -> serial communication IC -> interface IC -> integrated circuit. Unlike microcontrollers with built-in CAN, the MCP2515 is a pure controller (no transceiver, no CPU), so it requires an external CAN transceiver such as the MCP2551 or TJA1050 to physically drive the bus. Key features include full CAN 2.0B compliance with standard (11-bit) and extended (29-bit) identifier support, six acceptance filters and two acceptance masks to offload host MCU processing, a maskable interrupt output, and a programmable clock output derived from the on-chip oscillator. The device integrates two 8-bit timing registers and one 29-bit identifier mask/filter for robust message acceptance. Architecturally, the MCP2515 implements a three-buffer transmit engine with prioritisation and rollback, dual 11-bit/29-bit acceptance filters, and a 40-byte FIFO for received messages. The 18-pin PDIP package uses through-hole mounting suited for industrial modules, retrofit projects, development boards and educational platforms; an SOIC variant (MCP2515-I/SO) and tape-and-reel SO versions exist for SMD designs. Typical applications include Arduino CAN bus shields, Raspberry Pi HAT-based CAN modules, industrial sensor gateways, automotive diagnostics, building automation backbones, and battery management CAN reporting. The MIPI/SPI interface simplifies attachment to virtually any MCU with an SPI master port. When designing with the MCP2515-I/P, ensure the external transceiver, termination resistors (120 ohm each end of bus) and a high-speed SPI clock source are present. The 18-pin PDIP footprint is identical to the legacy MCP2510-I/P, enabling drop-in migration paths across two chip generations. This page synthesizes distributor pricing, cross-brand drop-in alternatives, and PCB-level design notes not collected in the manufacturer datasheet alone.