Interface ICs
Subcategories
Products (3,400+)
ADM222ARZ - 2/2 RS-232 Transceiver 200kbps | Analog Devices
The ADM222ARZ is a high-speed, 5 V, 0.1 µF CMOS RS-232 transceiver from Analog Devices, featuring two drivers and two receivers in an 18-pin SOIC-W package. It operates from a single 5 V supply and uses an on-chip charge pump with small 0.1 µF external capacitors to generate RS-232 bipolar levels, achieving data rates up to 200 kbps. The device includes a shutdown (SHDN) pin that reduces supply current to 0.1 µA, making it ideal for power-sensitive portable applications. RS-232 transceivers are interface ICs that convert logic-level signals to RS-232 voltage levels for serial communication. They are part of the interface IC family, which also includes RS-485, CAN, and USB transceivers. The ADM222ARZ specifically provides the electrical signaling and protection required for legacy serial ports, enabling communication between microcontrollers and peripherals such as modems, GPS modules, and industrial equipment. Key features include a 200 kbps data rate, 0.1 µF charge pump capacitors, and a shutdown mode with 0.1 µA supply current. The device is fully compliant with EIA-232E standards and features a wide operating temperature range of -40°C to +85°C. The 18-pin SOIC-W package is suitable for space-constrained designs while providing adequate thermal performance. Technically, the ADM222ARZ uses a CMOS charge pump architecture to generate ±10 V RS-232 levels from a single 5 V supply. The internal charge pump requires only four external 0.1 µF capacitors, reducing board space and cost compared to older designs requiring larger capacitors. The receiver inputs tolerate up to ±30 V, providing robust protection against voltage spikes on the serial line. Typical applications include industrial automation, point-of-sale terminals, medical devices, and any system requiring reliable RS-232 communication. The shutdown feature is particularly useful in battery-powered devices where power conservation is critical. When designing with the ADM222ARZ, ensure that the charge pump capacitors are placed close to the V+ and V- pins to minimize noise and maintain proper voltage generation. The shutdown pin can be driven by a microcontroller GPIO to enter low-power mode when the serial port is idle.
ADM223ARS - 120kB/s 5V RS-232 Interface | Analog Devices
The Analog Devices ADM223ARS is a +5 V powered CMOS RS-232 driver and receiver interface IC featuring four transmitters, five receivers, a 120 kB/s data rate, and a 28-pin SSOP package. Its integrated on-board DC-DC converters produce approximately 9 V output swing from a single 5 V supply, while small 1 F capacitors support a compact implementation. An RS-232 interface is a transceiver category that converts logic-level signals into RS-232-compatible levels and converts received RS-232 signals back into CMOS logic. The ADM223ARS belongs to the interface IC hierarchy, which includes RS-232 transceivers, line drivers, line receivers, and multi-channel interface controllers. These devices connect conventional microcontroller, processor, and instrumentation logic to cable-based serial ports using differential bipolar voltage signaling. Key features include operation from a single +5 V supply, compliance with the stated EIA-232-E and V.28 specifications, a maximum data rate of 120 kB/s, approximately 9 V transmitter output swing, and support for small 1 F charge-pump capacitors. A low-power shutdown function reduces consumption when the interface is not needed, while the receiver channels remain active during shutdown. The receivers also provide a stated 30 V input capability. The integrated DC-DC conversion architecture removes the need for a separate external 5 V-to-approximately 9 V supply rail. This simplifies board design and reduces the number of power-supply connections around the transceiver. Because charge-pump capacitors and high-voltage driver outputs are involved, placement and return-current management remain important even though the device operates internally from only 5 V. Typical applications include RS-232 ports in industrial control equipment, data-acquisition systems, instrumentation, embedded control systems, and legacy serial-port interfaces. The combination of five receiver channels and four driver channels is useful when a system needs additional receive-only status or handshake signals beyond the four conductors required for bidirectional communication. A critical design consideration is that the S suffix denotes the 28-pin SSOP package used by this ordering code, so board layout and pin count must be checked before substitution. Cable protection, ground continuity, and isolation should also be evaluated because RS-232 is a physical-layer standard rather than a guarantee of surge immunity. This page consolidates verified manufacturer and distributor information, interface specifications, sourcing data, and replacement constraints into an engineer-oriented resource. It also separates verified drop-in replacements from broader functional equivalents to avoid implying PCB compatibility that the available cross-reference evidence does not establish.
ADM230LJN - +5V CMOS RS-232 Driver/Receiver, 120 kbps, PDIP-20 | Analog Devices
The Analog Devices ADM230LJN is a +5 V powered CMOS RS-232 line driver and receiver (transceiver) rated for data rates up to 120 kbps, packaged in a 20-pin plastic PDIP through-hole housing specified for 0 °C to +70 °C ambient operation. It is designed for EIA-232-E and V.28 serial interfaces where ±12 V supplies are not available. An RS-232 transceiver is an interface IC that combines a line driver and a line receiver, converting between TTL/CMOS logic levels and the differential bipolar signalling of the RS-232 standard. In the signal chain it belongs to the transceiver class, which sits between parallel logic ICs and a multi-driver, single-ended, physically long cable. A transceiver IC is a subtype of interface IC, which is itself part of the broader semiconductor and signal-conditioning hierarchy. Key features of the ADM230LJN include single +5 V operation, CMOS logic compatibility with 5 V microcontrollers, 120 kbps signalling rate, and a plastic PDIP-20 package that allows through-hole assembly and socketed prototyping. Because the part runs from a single +5 V rail, no separate negative voltage supply or external charge-pump components are required for standard RS-232 levels. The 0 °C to +70 °C rating places it firmly in commercial-temperature grade designs. The +5 V single-supply architecture is the key technical differentiator versus classic RS-232 transceivers that expect a dual ±12 V or ±5 V rail. This simplifies power tree design in industrial controllers, POS terminals, and instrumentation where only regulated +5 V is available, and it lowers overall board current compared with older bipolar driver-receiver combinations. Typical applications include PC serial port interfacing, industrial data acquisition and control panels, point-of-sale and retail peripherals, industrial instrumentation, and general-purpose RS-232 links between a host UART and an external modem or instrument. When designing with the ADM230LJN, keep the RS-232 cable run short, place the transceiver close to the connector, and route the differential receiver pair as a tightly coupled pair with a solid ground reference, because unbalanced RS-232 signalling is susceptible to ground-offset noise. This page consolidates verified distributor and manufacturer data, drop-in replacement options in the same PDIP-20 footprint, and practical interface-design notes that are not found in a single manufacturer datasheet.
ADM230LJR - 5V RS-232 Transceiver | Analog Devices
The Analog Devices ADM230LJR is a +5 V powered CMOS RS-232 driver and receiver designed for single-supply serial-interface designs where ±12 V is unavailable. It supports 120 kB/s data rates, includes an onboard DC-DC converter, and operates from a single 5 V supply. The device is housed in a 16-lead SOIC package. A CMOS RS-232 transceiver is an interface IC that converts logic-level digital signals into RS-232-compatible levels and converts incoming RS-232 signals back into logic levels. It belongs to the interface-IC hierarchy alongside drivers, receivers, and transceivers, providing the physical signaling layer between digital equipment and a serial port. The ADM230LJR is designed for EIA-232-E and V.28-compatible communication links, making it useful where a single supply rail is preferred over a dual-polarity RS-232 interface. The ADM230LJR includes one driver and one receiver in the same package. Its onboard DC-DC converter supports the RS-232 output swing from a 5 V supply, while the receiver remains active in shutdown mode. The datasheet information identifies a 9 V output swing, operation with 1 uF capacitors, a low-power shutdown function, and receiver input tolerance to 30 V. These features help simplify interface implementation in equipment that must protect logic-side circuitry from voltage transients. Because the ADM230LJR is powered from +5 V, its system-level implementation is simpler than traditional RS-232 designs using separate positive and negative supplies. The device is appropriate for instrumentation, industrial-control equipment, data-acquisition systems, embedded serial links, and service interfaces where the communication distance and signaling environment are consistent with RS-232 limits. The 120 kB/s rated data rate supports moderate-speed serial communication rather than high-bandwidth protocols. Layout should keep the serial traces short where possible, provide a stable return path, and place bypass capacitance close to the supply pins. The onboard converter and charge-pump circuitry require careful decoupling according to the manufacturer datasheet. A single 5 V rail, low-power shutdown, and active receiver operation are the principal features to evaluate when choosing this transceiver for compact or intermittently powered serial equipment.
ADM231LAN - 2/2 5V RS-232 Transceiver | Analog Devices
Analog Devices ADM231LAN is an obsolete low-power, +5 V CMOS RS-232 transceiver containing two line drivers and two line receivers in a 14-lead plastic dual in-line package. It supports EIA-232-E and V.28 communications interfaces where conventional ±12 V supplies are unavailable. According to the Analog Devices ADM231L family datasheet, the integrated charge-pump circuitry permits operation from a single +5 V supply while maintaining approximately ±5 V driver signal levels. The transceiver is intended for low-power serial-interface designs that require multiple RS-232 channels without external level-shifting components. An RS-232 transceiver is an interface IC that combines a transmitter and receiver with the voltage conversion required at a serial port boundary. The transmitter converts logic-level signals into RS-232-compatible levels, while the receiver converts incoming RS-232 levels back into CMOS-compatible signals. Within the broader semiconductor hierarchy, an RS-232 transceiver belongs to the interface IC family, alongside UARTs, level translators, isolated communication interfaces, and other data-communication components. The ADM231LAN combines two channels in each direction in one package. The principal feature is its two-driver, two-receiver arrangement. Its +5 V CMOS architecture avoids the need for a separate bipolar ±12 V power supply, reducing board complexity in systems where the host or controller already operates from +5 V. The manufacturer's Rev. C datasheet states that the family supports EIA-232-E and V.28 interfaces. It also identifies high slew rates and operation at data rates up to 100 kbps under worst-case loading conditions, making the device suitable for moderate-speed point-to-point serial links. The internal architecture uses charge-pump voltage generation to produce the bipolar signal levels required by RS-232 from one low-voltage supply. Each driver must still handle the voltage and current behavior of an RS-232 connection, including the possibility of a shorted or misconnected cable. The receiver provides the thresholding required to interpret bipolar RS-232 levels as valid logic states. Although the device eliminates external negative-supply generation, its communication performance still depends on correct supply bypassing, controlled-impedance interconnects, and appropriately terminated connector-side networks. Typical uses include industrial control links, point-of-sale equipment, data-acquisition systems, embedded serial ports, and legacy computer interfaces that cannot accept modern ±12 V RS-232 levels directly. It can also serve as a bridge between a +5 V CMOS controller and an RS-232 host, provided that the system observes the family's specified data-rate, supply, temperature, and package constraints. The ADM231LAN's lifecycle status is obsolete, so new production designs should verify current replacement availability before committing a PCB layout to it. The primary design consideration is package migration. The 14-lead plastic dual in-line package is relatively large and not as assembly-efficient as modern leadless or surface-mount interface packages. The 100 kbps capability is suitable for many control and instrumentation links but is not appropriate for higher-bandwidth protocols. Because the part is obsolete, engineers should evaluate listed drop-in candidates by pinout, driver and receiver count, supply voltage, data rate, and transceiver shutdown behavior rather than selecting a substitute solely by the RS-232 label. This product page combines verified manufacturer and distributor information with lifecycle context, application guidance, technical comparisons, and practical replacement-selection criteria. It distinguishes documented facts from unavailable parameters, highlights the ADM231LAN's +5 V two-driver/two-receiver architecture, and identifies the package and supply constraints that most affect drop-in replacement decisions.
ADM231LAQ - 5V CMOS RS-232 Transceiver | Analog Devices
The Analog Devices ADM231LAQ is a +5 V powered CMOS RS-232 driver and receiver capable of 120 kB/s data transfer, with on-board DC-DC converters, a 9 V output swing, and low-power shutdown in a 16-pin package. The device meets EIA-232-E and V.28 specifications according to the manufacturer datasheet listing, while its on-board converters permit operation from a single 5 V supply. A CMOS RS-232 interface transceiver is a signal-line interface integrated circuit that combines a line driver and receiver with the voltage conversion required by RS-232. Within the broader hierarchy of interface ICs, it translates low-voltage CMOS logic into RS-232-level signals and converts received RS-232 levels back into CMOS-compatible signals. Its applications include data acquisition, industrial control, test equipment, and equipment-to-equipment communication links. The ADM231LAQ supports a data rate of 120 kB/s and provides a 9 V output swing from a 5 V supply. Its on-board DC-DC converters eliminate the need for a separate boosted supply for the RS-232 driver. Small 1 µF charge-pump capacitors are specified for the converter implementation, reducing board area compared with traditional discrete charge-pump approaches. A low-power shutdown feature helps reduce supply consumption when the interface is not active. Unlike the standard shutdown arrangement in some competing transceivers, the ADM231LAQ keeps its receivers active during shutdown, allowing incoming RS-232 signals to remain detectable. Its receiver input can also tolerate signals as high as 30 V, which improves robustness when the connected cable or system exposes the interface to larger voltage excursions. The ADM231LAQ is suitable for point-to-point RS-232 links in industrial equipment, instrumentation, data loggers, and control systems. A single 5 V rail simplifies system power architecture, while the integrated converters maintain the positive and negative voltages required by RS-232. The 120 kB/s rate supports legacy serial communication, modem interfaces, and equipment control links where higher-speed differential standards are unnecessary. The principal design consideration is ensuring that external protection, connector selection, and grounding match the cable environment. The 30 V receiver input capability improves tolerance, but it does not replace surge protection or isolation in long industrial cable runs. Designers should also verify the exact package dimensions and pin assignment before PCB layout because the verified data identifies the device as a 16-pin part without publishing the package drawing in the supplied excerpts. This page consolidates the verified 120 kB/s operating rate, 5 V supply, 9 V output swing, 1 µF capacitor requirement, shutdown behavior, and distributor pricing information. It also separates confirmed data from unavailable package, pinout, lifecycle, and drop-in replacement details so engineers can identify what must be checked against the manufacturer datasheet before production release.
ADM231LAR - 5V RS-232 Transceiver, 120kB/s | Analog Devices
The Analog Devices ADM231LAR is a 5 V powered CMOS RS-232 driver and receiver intended for EIA-232-E and V.28 communications interfaces. It operates from a single 5 V supply, supports data rates up to 120 kB/s, and is available in a 16-lead SOIC package. The verified product information identifies the part as obsolete, so new designs should confirm availability before committing to a layout. An RS-232 transceiver is an interface IC that converts logic-level signals into the bipolar voltage levels used by RS-232 links and converts returning bipolar signals back to CMOS logic. Within the interface hierarchy, this device belongs to the line-driver and receiver family, then to communication transceivers, and finally to the broader category of interface ICs. Its integrated DC-DC converter allows the driver to generate the positive and negative voltage swings required by RS-232 from one 5 V rail. Key features include a 120 kB/s maximum data rate, on-board DC-DC converters, a 9 V output swing with the 5 V supply, and support for small 1 uF charge-pump capacitors. A low-power shutdown function reduces consumption when the interface is not required. According to the verified feature summary, the receiver remains active during shutdown, allowing incoming signals to be monitored without powering the transmitter section fully. The receiver input is rated to 30 V, providing tolerance for ±15 V RS-232 signals and additional margin on unused or disconnected receive inputs. These characteristics make the ADM231LAR applicable to legacy serial ports, industrial control links, service equipment, instrumentation, and embedded systems that communicate with older RS-232 equipment. The principal design trade-off is that the ADM231LAR is a legacy 120 kB/s interface rather than a modern high-speed or multi-port RS-232 solution. Its single-supply architecture simplifies systems that lack ±12 V rails, but obsolete lifecycle status, charge-pump capacitor requirements, and the lower 120 kB/s ceiling limit new design adoption. When planning a replacement design, engineers should verify the complete pinout, shutdown behavior, charge-pump capacitor values, and package dimensions rather than selecting a substitute from the RS-232 family name alone. The verified sources did not establish five pin-compatible drop-in replacements in the same 16-lead SOIC footprint, so the alternatives listed here are limited to candidates for which comparative information was found. This page consolidates the verified manufacturer and distributor information, lifecycle status, pricing reference, interface characteristics, and replacement guidance for engineers evaluating an obsolete ADM231LAR inventory.
ADM231LJR - 5V 120kbps RS-232 Transceiver | Analog Devices
The Analog Devices ADM231LJR is a 5 V powered CMOS RS-232 driver and receiver capable of 120 kB/s data transmission. The 16-lead gull-wing SOP package combines one supply rail, on-board DC-DC converters, low-power shutdown, and receiver operation during shutdown in a compact industrial interface circuit. An RS-232 transceiver is an interface IC that converts logic-level transmit and receive signals into differential-voltage, bipolar serial-line signals. Its functional hierarchy is RS-232 transceiver, line driver and receiver, communications interface IC, and broader semiconductor category. The ADM231LJR belongs to the ADM23xL family of single-supply RS-232 devices designed for industrial, instrumentation, and data-communication equipment. The ADM231LJR operates from a single 5 V supply and supports data rates up to 120 kB/s. Its on-board DC-DC converters produce the bipolar signal voltages required by RS-232 without a separate external charge-pump supply. The device provides 9 V output swing from a 5 V supply and uses only 1 F charge-pump capacitors, reducing board area compared with implementations requiring larger external capacitors. Power management features include low-power shutdown and receivers that remain active while the transmitter is shut down. This arrangement allows a system to monitor an RS-232 connection, detect activity, or wake a host without powering the full driver. The receiver input withstands voltages up to 30 V, improving tolerance to exposed industrial cabling and off-state bus conditions. Typical uses include industrial serial consoles, test and measurement equipment, point-of-sale terminals, programmable logic controllers, and embedded instruments that exchange serial data over longer cable runs than a logic-level UART. The 120 kB/s rate is suitable for configuration links, diagnostics, firmware update paths, and moderate-rate control data rather than continuous high-bandwidth streaming. The main design trade-off is power dissipation. A 5 V-only supply rail simplifies system power, but the DC-DC converters add internal switching activity compared with a dual-polarity implementation. Follow the recommended capacitor and charge-pump layout in the manufacturer datasheet, keep the RS-232 connector side of the circuit physically separated from sensitive analog and digital nodes, and provide a controlled signal ground reference.
ADM232AAN - 200kbps Dual RS-232 Transceiver | Analog Devices
Analog Devices ADM232AAN is a 200 kbps dual RS-232 line-driver and line-receiver interface IC with two drivers, two receivers, a single 5 V supply, and a 16-lead plastic DIP package. It uses small 0.1 µF charge-pump capacitors and provides approximately ±9 V driver output swing from the 5 V supply while accepting receiver inputs up to ±30 V. The device meets the EIA-232-E and V.28 specifications identified in the manufacturer documentation. An RS-232 transceiver is an interface IC that converts between single-ended logic-level signals and the bipolar, differential voltage conventions used by RS-232 equipment. In the broader hierarchy, it belongs to the interface IC category, combines line-driver and line-receiver functions, and provides physical-layer connectivity between computer serial ports, industrial controllers, and communications equipment. The ADM232A family is positioned as a pin-compatible, high-speed upgrade for the AD232 and ADM232L families. Key features include a 200 kB/s transmission rate, two transmit channels, two receive channels, a single 5 V supply, on-board DC-DC converters, and compatibility with MAX222, MAX232A, and MAX242 pin arrangements. The small 0.1 µF charge-pump capacitors reduce board-space requirements compared with older RS-232 implementations using larger flying capacitors. Receiver inputs tolerate ±30 V, supporting practical protection against larger voltage excursions encountered on an external RS-232 port. Technically, the charge-pump circuitry generates the positive and negative voltage rails required by RS-232 drivers from the single 5 V source. The ADM232AAN combines this internal supply conversion with CMOS driver and receiver stages. Its 200 kB/s data rate supports legacy serial links substantially above the older 64 kB/s class of interface while retaining the established EIA-232-E and V.28 signaling behavior. Because the ADM232AAN is a 16-lead DIP device, it is intended for through-hole assembly, prototyping, legacy equipment, and industrial control boards where a surface-mount RS-232 footprint would be inconvenient. Typical applications include industrial serial controllers, test and measurement instruments, point-of-sale equipment, data acquisition systems, legacy computer peripherals, and isolated or non-isolated RS-232 communication ports. In a typical circuit, the IC interfaces a microcontroller UART to a DB9 or other RS-232 connector. Series resistance may be required on driver outputs when the connected cable is unusually long or exposes the port to electrostatic discharge; connector protection should be selected according to the actual cable and installation environment. Designers should place the charge-pump capacitors close to their specified pins and route the high-current charge-pump paths to minimize switching noise. The 5 V supply must provide adequate transient current, and PCB grounding should preserve a low-impedance return path between the transceiver and connector. Because the ADM232AAN has no integrated isolation barrier, applications requiring galvanic isolation require external isolation components and a suitably isolated power design. This page combines the verified manufacturer specifications, distributor package identification, cross-reference findings, application guidance, and drop-in replacement criteria. It also distinguishes verified facts from electrical values that were not present in the supplied source data, helping engineers compare replacements without assuming that equivalent function automatically guarantees equivalent layout or system behavior.
ADM232AARN - 200kbps Dual RS-232 IC | Analog Devices
The Analog Devices ADM232AARN is a dual RS-232 line-driver and receiver interface IC supporting data rates up to 200 kB/s from a single 5 V supply. The device provides two transmitters and two receivers and is packaged in a 16-lead narrow SOIC for compact RS-232 interface designs. An RS-232 transceiver is a semiconductor interface that converts low-voltage digital logic signals into bipolar RS-232 levels and converts received bipolar signals back into TTL or CMOS logic levels. Within the electronics hierarchy, the ADM232AARN is an RS-232 transceiver, interface IC, and power-management-assisted data-conversion component used to bridge modern digital equipment with legacy serial ports. The ADM232AARN integrates an on-chip DC-DC charge pump, allowing bipolar RS-232 levels to be generated from one 5 V supply without a separate negative power rail. The charge pump uses small 0.1 uF external capacitors. Its two-driver, two-receiver arrangement supports two RS-232 channels per package and reduces the number of interface components required in multi-port equipment. Data rates reach 200 kB/s, making the device suitable for equipment that needs faster serial transfer than low-speed RS-232 transceivers. The interface meets EIA-232-E and V.28 specifications. According to the Analog Devices datasheet, the outputs provide approximately 9 V swing with a 5 V supply, while the receivers accept input voltages to 30 V, providing useful margin for standard RS-232 signaling. Typical uses include industrial control consoles, point-of-sale equipment, instrumentation, data acquisition systems, and embedded products that retain a legacy RS-232 port. The integrated charge pump simplifies board layout, while the narrow 16-SOIC package supports space-constrained designs without requiring a separate negative supply regulator. When laying out the circuit, place the charge-pump capacitors close to their specified pins and route the driver outputs and receiver inputs away from sensitive analog and high-speed digital traces. Confirm ground-reference compatibility between the two connected RS-232 endpoints because the interface converts voltage levels but does not isolate the ground connection. This page combines device specifications, pin-compatible alternatives, interface application guidance, and practical layout considerations to support component selection, PCB implementation, and sourcing decisions for the ADM232AARN.
ADM232LAN - 120 kbps Dual RS-232 Transceiver | Analog Devices
Analog Devices ADM232LAN is a 2/2 RS-232 line-driver and receiver transceiver operating from a single 5 V supply, with a data rate of 120 kbps and a 16-pin through-hole DIP package. The device is intended for EIA-232-E and V.28 interfaces when conventional ±12 V supplies are unavailable. An RS-232 transceiver is an interface IC that converts between single-ended logic-level signals and differential bipolar signaling used by RS-232 equipment. The ADM232LAN integrates two transmitters and two receivers, an onboard DC-to-DC converter, and charge-pump circuitry capable of producing approximately 9 V output swing from a 5 V supply. This places it in the interface IC hierarchy alongside RS-232 line drivers, receivers, and full-duplex communication transceivers. Key features include operation from one 5 V supply, 120 kbps data transmission, 1 µF external charge-pump capacitors, low-power shutdown, receiver operation during shutdown, and receiver input protection to 30 V. The dual 2/2 configuration allows two serial channels to be supported by one package. Its through-hole DIP construction is useful for legacy industrial control, instrumentation, test equipment, and system prototypes where surface-mount packages would be inconvenient. The ADM232LAN uses an on-chip DC-to-DC converter and charge pump to develop the positive and negative voltages required by RS-232 drivers. This topology avoids external ±12 V rails, although the external capacitors must be connected correctly and placed close to the device. The receiver converts incoming RS-232 voltage levels to CMOS-compatible logic, while each driver converts CMOS logic into RS-232 output levels. Typical uses include RS-232 ports in industrial controllers, laboratory instruments, barcode and data-acquisition equipment, configuration interfaces, and legacy computer peripherals. A two-channel implementation is especially useful where one port carries data and another carries control or status information. PCB design should reserve the documented charge-pump capacitor connections and provide adequate copper and grounding around the interface. Because the ADM232LAN is packaged in a 16-pin DIP, existing through-hole layouts may be easier to reuse than with a surface-mount alternative. Verify signal levels, capacitor values, grounding, and system shutdown behavior before substituting another RS-232 transceiver. This page combines verified distributor and datasheet-search information with practical interface-design guidance. It also distinguishes package-compatible alternatives from functionally similar devices that require different footprints or external-capacitor arrangements, helping engineers assess replacement risk before changing an RS-232 design.
ADM232LAR - 5V 2/2 RS-232 Transceiver, 120kB/s | Analog Devices
The Analog Devices ADM232LAR is a 5 V-powered CMOS RS-232 line driver and receiver providing two drivers and two receivers (2/2) in a 16-lead SOIC package. It supports data rates up to 120 kB/s, meets all EIA-232-E and V.28 specifications, and delivers a 9 V output swing from a single 5 V supply. An RS-232 transceiver is an interface IC that translates logic-level CMOS signals into the bipolar, +/- voltage signalling used by the RS-232 (EIA-232) standard. It sits between a UART or microcontroller and a physical cable. The wider ADM2xx family of line drivers and receivers was designed for EIA-232-E and V.28 communications interfaces, especially where +/-12 V supplies are not available, and the ADM232 in particular adds on-board DC-DC converters so no external charge-pump components or negative supply are needed. Key features include a single 5 V power supply, on-board DC-DC converters with 9 V output swing capability, small 1 uF external capacitors, a low-power shutdown mode, 1 uA receiver operation while in shutdown, and receiver inputs tolerant to 30 V. The CMOS implementation keeps power consumption low compared with classic bipolar RS-232 transceivers. Technically, the part uses an on-chip switched-capacitor DC-DC converter to generate the positive and negative rail voltages required for compliant RS-232 output levels, while the receiver stage is designed for high noise immunity and failsafe operation when the driver is disabled or the line is unconnected. The result is full RS-232 compliance from a single rail, which simplifies board layout and reduces the external component count to a small number of 1 uF capacitors. Typical applications include industrial serial port adapters, instrumentation and test equipment, barcode and data-collection terminals, security and access-control panels, and general-purpose RS-232 links between a host UART and peripheral equipment where cable lengths and ground offsets require the +/- voltage swing of the RS-232 standard. When designing around the ADM232LAR, place the 1 uF capacitors close to the charge-pump and driver pins, keep the RS-232 connector and cable routing separated from sensitive analog and clock traces to limit EMI, and account for the shutdown pin when the host needs to tri-state or power down the port. Because the receivers remain active in shutdown, the interface can still report line state while the driver current is minimized. This page consolidates distributor listings, verified datasheet features, drop-in replacement options in the identical 16-SOIC footprint, and practical PCB and EMI design notes that are not assembled in one place in the original manufacturer documentation.
ADM232LJN - 5V RS-232 Transceiver | Analog Devices
The Analog Devices ADM232LJN is a 5 V-powered CMOS RS-232 transceiver with two transmitters and two receivers, supplied in a 16-pin PDIP package. It supports 120 kB/s data rates, on-board DC-DC converters, approximately ±9 V output swing from a 5 V supply, 1 µF external capacitors, low-power shutdown, and receiver inputs that remain active during shutdown. According to the manufacturer product page, the ADM232L family is intended for EIA-232-E and V.28 communications interfaces where ±12 V is not available. An RS-232 transceiver is an interface IC that combines differential signal drivers and receivers for serial data communication over single-ended, bipolar RS-232 links. The transmitter converts logic-level signals into RS-232 levels, while the receiver converts bipolar RS-232 inputs back into CMOS-compatible logic levels. In the product hierarchy, an RS-232 transceiver is a line driver/receiver, a communications interface IC, and a semiconductor designed to bridge modern digital logic and older serial-interface equipment. The ADM232LJN combines a single 5 V supply with onboard charge-pump DC-DC converters, allowing the device to generate the bipolar voltage levels needed for RS-232 transmission without separate ±12 V rails. Its specified 120 kB/s data rate supports legacy serial ports, industrial equipment, and control systems. The approximately ±9 V output swing provides the required interface voltage amplitude while the CMOS implementation supports operation from one 5 V supply. The interface also includes low-power shutdown to reduce power dissipation when the link is not active. The receivers are specified as active in shutdown, allowing selected receive paths to remain operational during a low-power state. The use of small 1 µF capacitors makes the charge-pump and supply bypassing network relatively compact, which is useful in equipment where PCB area is constrained. Typical applications include legacy PC serial ports, industrial instrumentation, barcode scanners, test equipment, embedded control systems, and communications links to equipment designed for EIA-232-E or V.28 interfaces. The device is particularly useful where the system has a 5 V logic rail but the connected peripheral requires RS-232 signal levels. Designers should preserve the intended capacitor values, place charge-pump capacitors close to their specified pins, and route the RS-232 connector and cable interface away from sensitive analog or high-speed digital circuitry. The verified ADM232LJN data confirms a 16-pin PDIP package and a 120 kB/s data rate, but it does not provide a complete public pin-by-pin pinout or current distributor price table in the supplied material. This page consolidates the verified manufacturer and distributor information, separates confirmed specifications from unavailable data, and identifies a confirmed same-package family alternative. It also provides practical selection guidance for engineers choosing between single-supply RS-232 transceivers and legacy multi-rail implementations.
ADM232LJR - 5V 120kbps RS-232 Transceiver | Analog Devices
The Analog Devices ADM232LJR is a 5 V powered RS-232 line-driver and receiver IC with two drivers, two receivers, a 120 kbps data rate, and a 16-pin SOIC package. It provides ±9 V output swing, onboard DC-DC converters, and 1 µF charge-pump capacitors, allowing EIA-232-E and V.28 communication without external ±12 V rails. The receiver remains active during shutdown according to the supplied manufacturer-family data. An RS-232 transceiver is an interface IC that converts logic-level signals into differential bipolar voltages for transmission and converts received bipolar voltages back into CMOS-compatible logic levels. In the product hierarchy, it belongs to the communications interface IC class, where it bridges a host controller or UART with a cable-based RS-232 port. Unlike RS-422 and RS-485 interfaces, RS-232 uses single-ended signaling referenced to ground and is primarily intended for point-to-point communication. The ADM232LJR operates from a single 5 V supply and supports data rates up to 120 kbps. Its integrated DC-DC converter generates the positive and negative voltage levels required by the EIA-232-E drivers without requiring an external dual supply. Other documented features include low-power shutdown, 1 µF external charge-pump capacitors, approximately ±9 V driver output swing from a 5 V supply, and receiver input protection rated to 30 V. The device contains two transmit channels and two receive channels, allowing two serial ports or one full-duplex port with flow-control signals to share one package. Its CMOS-compatible digital inputs connect directly to the transmit and shutdown-control circuitry of microcontrollers, DSPs, and embedded processors. The balanced set of receive and transmit functions supports protocol-handshake signals as well as primary data channels without requiring separate RS-232 line-driver ICs. Typical uses include industrial serial consoles, point-of-sale equipment, instrumentation, embedded control systems, and legacy peripheral connectivity. The 120 kbps rate comfortably supports many UART protocols and short-distance point-to-point links. Systems that previously used ±12 V RS-232 can simplify their power architecture by using one 5 V rail, provided the selected connector, cable, and protection network are suitable for the intended installation. Designers should use the manufacturer's recommended charge-pump capacitor values and observe polarity and voltage limits on all interface pins. The 30 V receiver-input rating does not permit unrestricted hot-plug or surge exposure, so external protection may still be required for exposed industrial cabling. The shutdown function should also be checked against the system requirement because the supplied family data states that the receivers remain active while the drivers are shut down. This page combines verified manufacturer and distributor information, package-aware replacement guidance, application engineering notes, and a specification comparison that are not consolidated on a typical distributor product listing. The alternatives are presented as candidates that still require schematic, pinout, and system-level verification before substitution.
ADM233LAN - 5V RS-232 Transceiver, 120kB/s | Analog Devices
The Analog Devices ADM233LAN is a 5 V RS-232 transceiver with two drivers and two receivers, a maximum data rate of 120 kB/s, and integrated DC-DC converters that produce ±9 V output swing from a single 5 V supply. The device is supplied in a 20-pin PDIP package and is intended for EIA-232-E and V.28 communications interfaces. An RS-232 transceiver is an interface IC that combines differential line-driver and receiver functions with the voltage conversion required by the EIA-232 standard. It belongs to the interface IC hierarchy, where an RS-232 transceiver operates between a digital logic circuit and a wired communications port. This is particularly useful when the equipment-side logic supply is 5 V but the RS-232 port requires positive and negative signal voltages. Key features include operation from one 5 V supply, support for data rates up to 120 kB/s, on-board DC-DC converters, ±9 V output swing, and operation with small 1 µF capacitors. The integrated charge-pump circuitry eliminates the need for a separate external power-supply circuit, reducing board area and simplifying serial-interface implementation. Technically, the ADM233LAN is a 2/2 full RS-232 transceiver: two transmitter channels and two receiver channels are provided in one package. Its on-board converters generate the bipolar voltage levels required by RS-232 while the device interfaces with conventional 5 V CMOS logic. This integration is valuable in compact industrial, instrumentation, and embedded systems where component count and PCB area are constrained. Typical uses include RS-232 test equipment, data-acquisition systems, industrial control links, service interfaces, and legacy peripheral connections. In these applications, the device can translate 5 V TTL or CMOS UART signals to and from the bipolar RS-232 interface. Designers should still include appropriate line protection and verify signal-integrity requirements in long or electrically noisy installations. A primary design consideration is charge-pump capacitor selection and placement. The manufacturer documentation specifically highlights small 1 µF capacitors, and these components should be placed close to the associated device pins to minimize loop area and preserve stable converter operation. Decoupling, grounding, and protection requirements should be implemented according to the manufacturer datasheet. This page consolidates the verified manufacturer and distributor information with a pin-compatible family alternative, parameter comparison, application guidance, and practical interface-design notes. It distinguishes documented electrical facts from parameters that require confirmation in the current manufacturer datasheet or distributor inventory record.
ADM233LJN - 2/2 RS-232, 5V, 120kbps | Analog Devices
The Analog Devices ADM233LJN is a 5 V-powered CMOS RS-232 transceiver with two drivers and two receivers, a 120 kbit/s data rate, and a 20-pin PDIP package. Its integrated DC-DC converter produces approximately ±9 V output swing from a single 5 V supply, while its small 1 µF charge-pump capacitors simplify implementation of EIA-232-E and V.28 interfaces. An RS-232 transceiver is an interface IC that converts logic-level digital signals into differential bipolar transmission signals and converts received bipolar signals back into CMOS logic levels. The ADM233LJN belongs to the RS-232 transceiver category, where it bridges the gap between low-voltage digital systems and the voltage-tolerant, ground-referenced communication interface historically defined by RS-232. Key features include one 5 V supply, two driver and two receiver channels, operation at 120 kbit/s, onboard DC-DC conversion, ±9 V output swing, low-power shutdown, and 1 µF external charge-pump capacitors. The receiver input withstands voltages up to 30 V, while shutdown keeps the receivers active, allowing a connected system to retain incoming data during a local transmitter shutdown. The integrated charge-pump architecture eliminates the need for a separate ±12 V supply and reduces external component count compared with conventional RS-232 implementations. The transmitter actively drives the RS-232 signal levels, while the receiver provides noise tolerance and level translation for incoming data. This makes the device suitable for equipment in which a modern 5 V logic supply is available but a legacy computer serial port is not. Typical applications include industrial serial adapters, point-of-sale terminals, instrumentation, barcode scanners, security equipment, and embedded control systems. The ADM233LJN is particularly useful when a PCB must implement a full RS-232 port using only a 5 V rail and through-hole assembly, while its integrated converters reduce the external power-tree complexity. Designers should verify the external charge-pump capacitor values, connector protection, and ground arrangement against the manufacturer datasheet. Although the receiver tolerates inputs up to 30 V, exposed RS-232 connectors should receive appropriate surge and electrostatic-discharge protection. Decoupling and charge-pump capacitor placement also require careful PCB layout to minimize switching noise and data errors. This page combines verified manufacturer specifications, current sourcing information, drop-in replacement analysis, and practical application guidance. It also distinguishes verified electrical differences from unknown parameters so engineers can assess PCB, regulatory, and lifecycle implications before committing to a design.
ADM234LAN - 5V RS-232 Driver/Receiver | Analog Devices
The Analog Devices ADM234LAN is a 5 V-powered CMOS RS-232 driver and receiver IC with four driver channels and four receiver channels in a 16-pin PDIP package. It supports EIA-232-E and V.28 communications interfaces without requiring external ±12 V supplies. Verified data identifies a 120 kB/s data rate, on-board DC-DC converters, 9 V output swing from a 5 V supply, low-power shutdown, 1 A receiver inputs, and receiver inputs that remain active during shutdown. A line transceiver is an interface IC that converts logic-level signals into RS-232 voltage levels and converts received RS-232 signals back into CMOS-compatible logic. The ADM234LAN belongs to the line-driver and receiver hierarchy, within interface transceivers and communications interface ICs. Its integrated charge-pump and DC-DC circuitry allows a single-ended 5 V supply to generate the positive and negative voltage levels required by a conventional RS-232 port. The four transmitters and four receivers make the ADM234LAN suitable for implementing a complete multi-channel RS-232 interface on one integrated circuit. Its 120 kB/s rated data rate supports legacy serial links, industrial equipment, data-acquisition systems, and control equipment that use EIA-232-E or V.28 signaling. The 9 V output swing provides the voltage amplitude needed by RS-232 while the receiver section handles signals arriving from a cable-connected remote device. The device includes low-power shutdown control and receiver behavior designed to remain operational while the rest of the interface is shut down. That feature can simplify asynchronous serial designs in which one channel must monitor a remote link while the remaining transmitter and receiver functions are inactive. The receiver input also withstands 30 V, increasing tolerance to transients and voltage levels encountered on external RS-232 connections. The ADM234LAN is supplied in a 16-pin PDIP package, making it appropriate for legacy through-hole boards, prototypes, and industrial control systems that use conventional DIP footprints. Designers should provide the required external capacitors, route the interface connector and cable ground appropriately, and verify every signal pin against the current manufacturer datasheet before production use. For a new design, the ADM234LAN offers a practical way to add RS-232 capability from one 5 V rail without implementing an external switched-capacitor inverter. Its tradeoff is the relatively slow 120 kB/s data rate compared with USB, LVDS, or modern high-speed differential interfaces. The ADM234LAN is therefore most appropriate where protocol compatibility and legacy EIA-232-E or V.28 support matter more than throughput.
ADM234LAR - 4/4 5V RS-232 Interface | Analog Devices
The Analog Devices ADM234LAR is a 5 V-powered CMOS RS-232 interface IC containing four drivers and four receivers, supporting data rates up to 120 kB/s in a 20-lead SSOP package. It is designed for single-supply equipment that must communicate with legacy RS-232 ports using EIA-232-E and V.28-compatible signaling. An RS-232 interface IC is a transceiver within the broader interface-IC and data-communication semiconductor hierarchy. It converts low-voltage CMOS logic into RS-232-compatible line levels and converts incoming RS-232 signals back into CMOS logic. The ADM234LAR integrates this bidirectional conversion so a system can connect a UART, microcomputer, or embedded controller to a serial port without implementing discrete charge-pump and level-shifting circuits on the PCB. Key features include a single 5 V power supply, 120 kB/s data rate, onboard DC-DC converters, approximately 9 V output swing from a 5 V supply, and support for 1 µF charge-pump capacitors. Low-power shutdown is also listed, while the receivers remain active during shutdown. A 30 V receiver-input rating provides additional tolerance for exposed serial connections. The integrated DC-DC converter allows the drivers to generate the positive and negative voltage swings required by RS-232 without a negative supply rail. This simplifies system power architecture, although external charge-pump capacitor selection, layout, and ripple behavior remain important. The four-driver/four-receiver arrangement consolidates multiple serial channels in one package and can reduce board area when compared with separate single-channel transceivers. Typical applications include industrial serial controllers, data-logging equipment, instrumentation, point-of-sale systems, embedded control panels, and legacy peripheral connectivity. The ADM234LAR is particularly useful where the host logic operates from 5 V but the external cable interface requires bipolar RS-232 levels. Designers must still account for cable length, common-mode voltage, ground noise, and protection requirements. The principal layout consideration is keeping charge-pump and high-voltage driver paths compact while maintaining adequate separation from sensitive logic. Place the specified capacitors close to their associated pins, use a low-inductance ground return, and route protected connector-side traces away from clocks, analog inputs, and precision references. A solid ground plane and short return path help reduce RS-232 return-current effects. This product page combines the verified ADM234LAR feature data with package guidance, application analysis, comparison criteria, and design notes. Because verified pricing, exact pin functions, operating-temperature limits, and several electrical limits were not included in the supplied records, those fields are marked for confirmation rather than inferred from unrelated parts.
ADM234LJR - 5V CMOS RS-232 Drivers/Receivers | Analog Devices
The Analog Devices ADM234LJR is a 5 V-powered CMOS RS-232 line driver and receiver integrated circuit designed for EIA-232-E and V.28 communication interfaces. It provides four drivers and four receivers in a 16-lead SOIC package, supporting operation from a single 5 V supply while producing approximately 9 V RS-232 output swing. The device includes on-board DC-DC converters, allowing ±12 V RS-232-level signaling without an external dual supply. According to the manufacturer datasheet, the interface supports data rates up to 120 kB/s, includes low-power shutdown, and provides approximately 1 F charge-pump capacitors. The ADM234LJR is suitable for industrial equipment, instrumentation, data acquisition, and embedded serial links where a single 5 V rail must connect to an RS-232 transceiver port. Its CMOS implementation targets low power consumption and compact PCB area compared with discrete RS-232 interface designs. The 16-pin SOIC package is available in commercial temperature-grade product ordering and is identified by the ADM234LJR part number. Designers should account for RS-232 cable length, signal polarity, grounding, and the voltage limits of the connected equipment when deploying this interface. The internal charge-pump architecture simplifies the power-supply arrangement, but external bypass and charge-pump capacitors remain necessary according to the datasheet application guidance.
ADM235LJN - 5V RS-232 Transceiver | Analog Devices
The Analog Devices ADM235LJN is a single-supply CMOS RS-232 line driver and receiver with a 5 V power supply, 120 kB/s data rate, and onboard DC-DC converters. The integrated converters produce a 9 V output swing without requiring external ±12 V supplies, while the device is housed in a 24-pin PDIP package measuring 0.600 inch, or 15.24 mm, across the lead span. An RS-232 transceiver is an interface IC that combines a transmitter and receiver for serial data links using differential voltage signaling. It belongs to the RS-232 line transceiver and interface IC hierarchy, where EIA-232-E and V.28 define the electrical behavior expected by compatible computer and industrial equipment. The ADM235LJN is intended for systems that need an RS-232 port but cannot conveniently provide both positive and negative supply rails. Key features include operation from one 5 V supply, onboard DC-DC conversion, 120 kB/s data throughput, a 9 V output swing, and support for low-power shutdown. The receivers remain active during shutdown and tolerate input voltages to 30 V. These characteristics make the device useful when an existing embedded system must deliver conventional RS-232 levels from a single low-voltage rail. The internal charge-pump and DC-DC circuitry eliminates the external negative supply normally associated with older RS-232 implementations. A 9 V output swing provides useful margin against the RS-232 voltage thresholds, while the 30 V receiver input rating helps protect the interface when connected to exposed or longer cables. Receiver and driver performance should still be evaluated against the system’s grounding and noise environment. Typical applications include industrial control consoles, POS terminals, service equipment, data acquisition systems, and embedded instrumentation. The device is especially appropriate where a 5 V logic rail is available but a separate negative voltage rail would increase power-supply complexity or reduce reliability. Cable length and data rate must be considered when designing the physical link. For implementation, place the device close to the RS-232 connector and keep the unprotected transceiver-side traces away from sensitive analog and high-speed digital signals. Verify bypass-capacitor placement and grounding against the manufacturer application guidance. The 24-pin PDIP format favors through-hole assembly and prototype or industrial equipment where a socket or leaded component is appropriate. This page organizes the electrical capabilities, interface use cases, comparison points, and implementation considerations of the ADM235LJN. It also distinguishes true package-level replacement options from related RS-232 devices that require different supplies, different packages, or different interface functions.
ADM236LAN - 5V 4/3 RS-232 Transceiver | Analog Devices
Analog Devices ADM236LAN is a 5 V powered CMOS RS-232 interface transceiver with four drivers, three receivers, 120 kB/s data rate, and on-board DC-DC converters in a 24-pin PDIP package. The single-supply design produces a 9 V output swing from a 5 V supply, while small 1 F capacitors support the on-board converters. Low-power shutdown keeps the receivers active, and the receiver inputs tolerate voltages up to 30 V. A CMOS RS-232 transceiver is an interface IC that converts digital logic levels into RS-232 line levels and converts incoming RS-232 signals back into logic-compatible levels. It belongs to the interface IC hierarchy, where transceiver ICs bridge low-voltage digital systems and older, high-voltage serial interfaces. The ADM236LAN combines transmit and receive functions in one device, reducing the number of separate line-interface components required by an RS-232 port. Key features include compliance with EIA-232-E and V.28 specifications, operation from one 5 V supply, a 120 kB/s maximum data rate, and four transmitters with three receivers. The integrated DC-DC converters eliminate the need for a separate negative supply rail and permit approximately 9 V output swing. The shutdown function reduces power use when the interface is inactive, while the always-active receivers can continue detecting incoming data. The device uses CMOS drivers and receivers to combine RS-232 signal conditioning with modern low-power logic interfacing. Its 1 F charge-pump capacitors support the on-board converters, and the 30 V receiver input rating provides margin for exposed serial ports. Designers should still protect the driver outputs against sustained overvoltage, electrostatic discharge, and uncontrolled cable transients according to the system-level requirements. Typical uses include industrial equipment, laboratory instruments, data acquisition systems, legacy controller ports, configuration interfaces, and service equipment requiring a compact RS-232 connection. The four-driver capability allows multi-channel arrangements, while three receiver channels support monitoring or handshake signals. It is particularly useful where a modern controller must communicate with equipment that retains an RS-232 interface. A key design consideration is that the ADM236LAN operates from 5 V, but its RS-232 driver outputs still use elevated voltage levels generated internally. Place the 1 F converter capacitors and interface-protection components close to their associated pins, keep the converter loop compact, and provide suitable return paths for high-current driver transitions. This page consolidates verified manufacturer and distributor information, same-package alternatives, technical comparisons, and practical integration guidance. It also distinguishes documented electrical characteristics from parameters that require confirmation against the current Analog Devices datasheet before a new design is released.
ADM236LJN - 4/3 5V RS-232 Transceiver | Analog Devices
Analog Devices ADM236LJN is a 4-driver, 3-receiver CMOS RS-232 interface transceiver operating from a single 5 V supply at data rates up to 120 kB/s, housed in a 24-pin DIP package. The integrated DC-DC converter produces approximately 9 V signal swings without requiring external ±12 V rails, while onboard 1 uF charge-pump capacitors simplify the application circuit. A CMOS RS-232 transceiver is an interface IC that converts logic-level signals into RS-232-compatible voltage levels and converts received RS-232 signals back into logic levels. In the interface hierarchy, it belongs to the RS-232 transceiver category, then to communications interface ICs, then to broader interface and semiconductor families. It is useful wherever two systems must exchange serial data across a noise-prone, unbalanced cable using the EIA-232-E and V.28 signaling specifications. Key features include a single 5 V power supply, four drivers, three receivers, a maximum data rate of 120 kB/s, an approximately 9 V output swing, and receiver input levels extending to 30 V. Low-power shutdown is supported, and the receivers remain active in shutdown according to the supplied family data. The interface also offers ESD protection greater than 2 kV and is described as latch-up free. The ADM236L family uses onboard charge-pump circuitry to generate the bipolar voltage required by RS-232 drivers from a single positive supply. This architecture removes the external ±12 V requirement common to older RS-232 implementations. A 4-to-3 driver and receiver arrangement suits asymmetric links, including systems that transmit on several lines but receive data on a smaller number of channels. Typical uses include industrial control links, point-of-sale equipment, instrumentation, data acquisition, and embedded serial ports where a 5 V system cannot provide ±12 V. The 120 kB/s capability is suitable for moderate-speed control and data-transfer channels rather than high-bandwidth protocols. Its DIP-24 package is also appropriate for through-hole legacy and industrial boards. Designers should provide the datasheet-specified 1 uF capacitors, route the charge-pump and interface connections according to the manufacturer's application guidance, and keep RS-232 routing away from sensitive analog signals. Confirm supply tolerance, transceiver direction, and connector-level protection against the actual board requirements before production use. This page combines verified manufacturer-family specifications, distributor availability information, structured comparison data, and practical integration guidance. It distinguishes package-level replacement constraints from merely similar RS-232 devices, helping engineers avoid substitutions that require pinout, channel-count, or board-layout changes.
ADM236LJR - 5V 120kbps RS-232 Transceiver | Analog Devices
Analog Devices ADM236LJR is a +5 V powered CMOS RS-232 drivers/receivers interface IC with a 120 kB/s data rate, 9 V output swing, and a 20-pin SOIC package. It integrates three drivers and three receivers with on-board DC-DC converters, allowing EIA-232-E and V.28 communications from a single 5 V supply without external +12 V and -12 V rails. The device also supports low-power shutdown below 5 µW and provides small 1 µF charge-pump capacitors. An RS-232 transceiver is an interface IC that combines line drivers, line receivers, and voltage-level translation for serial communications. In the product hierarchy, it belongs to interface ICs, data converters and interface devices, and semiconductor components. The ADM2xx family is intended for systems where conventional negative supply voltages are unavailable. The integrated converter approach reduces board complexity by producing bipolar RS-232 levels internally while the external system operates from 5 V. Key features include a maximum stated data rate of 120 kB/s, on-board DC-DC conversion, approximately 9 V output swing from a 5 V supply, and 1 µF external charge-pump capacitors. The low-power shutdown function reduces power dissipation to less than 5 µW, making the interface suitable for portable and power-conscious equipment. Two receivers remain active during shutdown, allowing selected incoming signals to be monitored while most of the transceiver is inactive. The receiver input withstands voltages up to 30 V, providing protection in industrial environments where connected equipment can present larger voltage excursions. The manufacturer datasheet also states that the drivers maintain approximately ±5 V signal levels at data rates up to 100 kbps under worst-case loading. These characteristics make the ADM236LJR useful where a compact, single-supply RS-232 connection is required without relying on an external bipolar power supply. Typical applications include industrial serial-port equipment, point-of-sale terminals, data acquisition systems, test and measurement instruments, security-system controllers, and battery-powered communication equipment. Designers should verify line capacitance, cable length, driver loading, and receiver input levels against the application’s EIA-232-E requirements. The shutdown-control logic and the behavior of the two always-active receivers should also be checked to ensure they meet the system power-management sequence. For a robust layout, place the 1 µF charge-pump capacitors close to their associated IC pins and keep the high-voltage driver outputs away from sensitive input traces. Confirm that the external supply remains stable during data transmission, and account for the positive temperature coefficient of RS-232 thresholds when designing across the full operating environment. The exact pin names, package dimensions, and full electrical limits should be confirmed against the official Analog Devices datasheet before layout release. This page combines the verified Analog Devices datasheet information, current distributor availability, same-package alternatives, and practical design guidance. It highlights the ADM236LJR’s single-supply operation, integrated DC-DC conversion, shutdown behavior, and interface trade-offs in a format intended for component selection and PCB design decisions.
ADM237LJR - 5V 5-Driver 3-Receiver RS-232 | Analog Devices
Analog Devices ADM237LJR is a 5 V powered CMOS RS-232 driver/receiver transceiver with five drivers, three receivers, and a 24-SOIC package. It operates from a single 5 V power supply, supports data rates up to 120 kB/s, and provides 9 V output swing using onboard DC-DC converters. The device is designed for systems that require RS-232 communication without externally supplied positive and negative voltage rails. An RS-232 interface transceiver belongs to the communications IC hierarchy and combines digital line-driver and receiver functions with the voltage conversion needed for unbalanced point-to-point serial links. The ADM237LJR is a multichannel variant intended to reduce the number of interface packages required in industrial control, instrumentation, data acquisition, and embedded systems. Its five-driver and three-receiver organization supports asymmetric channel counts where several devices transmit and fewer devices receive data. Key features include single 5 V operation, compliance with EIA-232-E and V.28 specifications, a maximum data rate of 120 kB/s, onboard DC-DC converters, and a 9 V output swing from a 5 V supply. The advertised 1 µF charge-pump capacitor requirement helps keep the external component count low. Low-power shutdown is supported, while the receivers remain active during shutdown according to the supplied manufacturer and distributor information. The integrated charge-pump architecture raises the 5 V supply to the bipolar voltage levels required by RS-232 drivers. This architecture eliminates a separate external power supply for positive and negative transceiver rails, although the internal converters, driver output swing, receiver thresholds, and supply noise still require careful PCB treatment. With three receivers receiving up to 30 V input, the receive network must be protected from excessive voltage and ESD exposure. Typical uses include multi-channel RS-232 test equipment, industrial data-acquisition controllers, serial port expanders, point-of-sale terminals, communications adapters, and embedded control systems. A design with more than three receive endpoints should account for the receiver-count limitation, while a design requiring more than five transmit endpoints needs another transceiver or a different channel configuration. Place the charge-pump capacitors and interface bypass capacitors close to their specified pins, and route each RS-232 driver and receiver as a separate routed signal rather than through shared buses. Confirm connector-level transient protection and chassis grounding separately from logic-side protection because the ADM237LJR is not a surge-protection device. This product page consolidates the verified manufacturer description, distributor pricing, channel configuration, package information, interface characteristics, and practical replacement guidance. It also distinguishes a true same-package alternative from related devices that differ in package, channel count, or interface function, preventing a functionally similar part from being presented as an unqualified drop-in replacement.