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ADM231LAN - 2/2 5V RS-232 Transceiver | Analog Devices
ADM231LAN

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.

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ADM231LAQ - 5V CMOS RS-232 Transceiver | Analog Devices
ADM231LAQ

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.

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ADM231LAR - 5V RS-232 Transceiver, 120kB/s | Analog Devices
ADM231LAR

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.

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ADM231LJR - 5V 120kbps RS-232 Transceiver | Analog Devices
ADM231LJR

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.

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ADM232AAN - 200kbps Dual RS-232 Transceiver | Analog Devices
ADM232AAN

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.

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ADM232LAN - 120 kbps Dual RS-232 Transceiver | Analog Devices
ADM232LAN

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.

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ADM232LAR - 5V 2/2 RS-232 Transceiver, 120kB/s | Analog Devices
ADM232LAR

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.

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ADM232LJN - 5V RS-232 Transceiver | Analog Devices
ADM232LJN

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.

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ADM232LJR - 5V 120kbps RS-232 Transceiver | Analog Devices
ADM232LJR

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.

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ADM233LAN - 5V RS-232 Transceiver, 120kB/s | Analog Devices
ADM233LAN

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.

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ADM233LJN - 2/2 RS-232, 5V, 120kbps | Analog Devices
ADM233LJN

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.

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ADM234LAN - 5V RS-232 Driver/Receiver | Analog Devices
ADM234LAN

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.

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ADM234LAR - 4/4 5V RS-232 Interface | Analog Devices
ADM234LAR

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.

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ADM234LJR - 5V CMOS RS-232 Drivers/Receivers | Analog Devices
ADM234LJR

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.

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ADM235LJN - 5V RS-232 Transceiver | Analog Devices
ADM235LJN

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.

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ADM236LAN - 5V 4/3 RS-232 Transceiver | Analog Devices
ADM236LAN

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.

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ADM236LJN - 4/3 5V RS-232 Transceiver | Analog Devices
ADM236LJN

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.

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ADM236LJR - 5V 120kbps RS-232 Transceiver | Analog Devices
ADM236LJR

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.

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ADM237LJR - 5V 5-Driver 3-Receiver RS-232 | Analog Devices
ADM237LJR

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.

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ADM238LAN - 120 kbps 4/4 RS-232 Transceiver | Analog Devices
ADM238LAN

ADM238LAN - 120 kbps 4/4 RS-232 Transceiver | Analog Devices

The Analog Devices ADM238LAN is a 4/4 full-duplex RS-232 transceiver with four drivers and four receivers, a 120 kB/s data rate, and a single 5 V supply in a 24-pin PDIP package. Its integrated DC-DC converters generate the bipolar voltage required by RS-232 drivers from one 5 V input, while four external 1 uF capacitors support the charge-pump circuitry. According to the manufacturer product information, the device provides a 9 V output swing with a 5 V supply, low-power shutdown, receiver operation in shutdown, and receiver input levels extending to 30 V. An RS-232 transceiver is an interface IC that combines line drivers and receivers for serial data links using the EIA-232-E and V.28 standards. It belongs to the broader interface IC hierarchy and converts between low-voltage digital logic levels and the bipolar voltage swings used on an RS-232 cable. The ADM238LAN is especially useful when a system has only a 5 V supply but requires full-duplex RS-232 connectivity rather than single-direction or unbalanced logic-level signaling. The four drivers provide transmit-side level shifting, while the four receivers support independent receive channels. A 120 kB/s maximum data rate suits industrial equipment, data acquisition systems, service interfaces, embedded controllers, and legacy peripheral connections. The single-supply architecture reduces external power complexity compared with traditional RS-232 designs that require positive and negative supplies, while the onboard converters preserve the bipolar signaling required at the cable interface. The ADM238LAN family meets EIA-232-E and V.28 requirements and supports a data rate up to 120 kB/s. Its advertised 9 V output swing is adequate for reliable RS-232 signaling in noise-prone industrial environments, and the 30 V receiver input rating provides additional protection against excessive interface voltage. The integrated shutdown function can reduce consumption when the interface is not needed, although applications must account for the device-specific shutdown and receiver-enable timing shown in the manufacturer datasheet. Typical applications include multi-port RS-232 connections in industrial controllers, laboratory instrumentation, point-of-sale equipment, telecommunications equipment, and embedded systems requiring four transmit and four receive channels. Because the device is a 4/4 transceiver, it supports full-duplex links and can handle bidirectional traffic without separate driver and receiver packages. The 24-pin PDIP package also facilitates prototyping and through-hole service access where fine-pitch surface-mount assembly is undesirable. The principal design consideration is the external charge-pump capacitor network. Use the required 1 uF capacitors with close PCB placement, observe the stated polarity, and route the high-voltage driver outputs away from sensitive logic and clock lines. Confirm the transceiver’s shutdown behavior in the system power sequence, especially when receivers must remain active while drivers are disabled. This page combines the manufacturer’s ADM238L product information with interface-family specifications and practical selection guidance. It distinguishes pin-compatible family options from related devices with different driver or receiver counts and highlights the ADM238LAN’s 120 kB/s, four-channel, single-supply architecture for engineers designing robust RS-232 links.

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ADM238LAQ - 4/4 RS-232 Transceiver, 120 kB/s | Analog Devices
ADM238LAQ

ADM238LAQ - 4/4 RS-232 Transceiver, 120 kB/s | Analog Devices

The Analog Devices ADM238LAQ is a four-driver, four-receiver RS-232 transceiver designed for single 5 V operation in a 24-lead ceramic DIP package. It supports data rates up to 120 kB/s, provides on-board DC-DC converters, and uses 1 uF capacitors for charge-pump operation. The device meets EIA-232-E and V.28 specifications while delivering a 9 V output swing from a 5 V supply. These characteristics make the ADM238LAQ suitable for industrial control, instrumentation, data acquisition, and legacy serial-port interfaces that require four RS-232 channels without external transmit voltage conversion. An RS-232 transceiver is an interface integrated circuit that combines line drivers and line receivers for bidirectional or unidirectional serial communication. It belongs to the interface IC hierarchy, converting between low-voltage CMOS logic levels and the positive and negative voltage levels used by RS-232 links. The ADM238LAQ provides four driver channels and four receiver channels, allowing one package to support several data paths or to provide transmit-only and receive-only groups on the same board. Key features include a single 5 V power supply, operation to 120 kB/s, integrated DC-DC converters, a 9 V output swing, and low-power shutdown with receivers remaining active. The receiver input withstands voltages up to 30 V according to the product information. A 1 uF charge-pump capacitor requirement and integrated conversion circuitry reduce the external component count compared with discrete RS-232 implementations. The 24-CDIP package is 0.300 inches wide, or 7.62 mm. Technically, the device integrates four CMOS RS-232 drivers, four receivers, and the supporting charge-pump converters needed to generate bipolar output levels from one 5 V rail. This architecture suits equipment with multiple asynchronous serial ports, including test systems, industrial controllers, service interfaces, and data-logging equipment. Shutdown behavior is especially useful for systems where transmitters must stop driving while incoming data must still be monitored. Typical applications include four-channel RS-232 instrument control, factory automation equipment with multiple serial links, legacy peripheral connections, and embedded control systems that retain an RS-232 interface. The 120 kB/s rate is substantially faster than the original 20 kB/s RS-232 target, although actual application throughput remains constrained by protocol overhead and cable characteristics. A key design consideration is the ceramic DIP footprint: unlike a surface-mount alternative, it requires through-hole insertion and adequate spacing for assembly and service. Designers should preserve the pinout assigned to the 24-CDIP variant, validate signal levels at the connector, and confirm that the selected charge-pump capacitors meet the manufacturer's stability and temperature requirements. This page consolidates the confirmed electrical characteristics, package information, interface use cases, and design considerations for engineers evaluating the ADM238LAQ as a four-channel RS-232 interface solution.

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ADM238LJN - 4/4 120kbps RS-232 IC | Analog Devices
ADM238LJN

ADM238LJN - 4/4 120kbps RS-232 IC | Analog Devices

Analog Devices ADM238LJN is a 4/4 full-duplex RS-232 line-driver and receiver interface IC with a 120 kB/s data rate, single 5 V power supply, and 24-pin PDIP package. It provides four transmit drivers and four receive channels, producing approximately 9 V output swing from the 5 V supply through on-board DC-DC converters. The device targets EIA-232-E and V.28 serial interfaces where a ±12 V supply is unavailable. An RS-232 transceiver is an interface IC that combines differential digital signaling levels with a single logic-level supply. In the broader electronics hierarchy, the ADM238LJN belongs to the interface IC class, specifically the RS-232 transceiver family. Its integrated DC-DC converter generates the higher voltage needed for RS-232 driver outputs while the receiver circuitry restores serial data to compatible logic levels. The ADM238LJN's principal features include a 120 kB/s data rate, 9 V output swing, 1 F charge-pump capacitors, a low-power shutdown function, and receivers that remain active during shutdown. A 1 A receiver output capability supports the stated receiver-load condition, while the 30 V receiver-input rating provides additional tolerance for exposed serial lines. These characteristics simplify legacy and industrial RS-232 connections without requiring a separate negative supply rail. The device is intended for EIA-232-E and V.28 communications interfaces, including industrial equipment, instrumentation, data-acquisition systems, service consoles, and legacy peripheral connections. Four full-duplex channels allow one connector to carry four data paths in each direction. Its 120 kB/s rate is suitable for conventional serial control and communication links rather than high-speed differential or Ethernet protocols. PCB design must preserve the RS-232 interface requirement for a single 5 V supply even though driver outputs swing to approximately 9 V. Place the specified 1 F capacitors close to the charge-pump pins, route driver outputs away from sensitive receiver and logic traces, and maintain the 24-pin PDIP footprint without changing the land pattern. Review the receiver input rating before connecting externally accessible lines. The ADM238LJN is listed as obsolete, so availability may be limited. This page synthesizes the device specifications, sourcing guidance, drop-in comparison, application guidance, and design considerations that engineers need when supporting an installed ADM238LJN design.

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ADM238LJR - 4/4 5V RS-232 Transceiver | Analog Devices
ADM238LJR

ADM238LJR - 4/4 5V RS-232 Transceiver | Analog Devices

The Analog Devices ADM238LJR is a four-driver, four-receiver RS-232 transceiver powered by a single 5 V supply and packaged in a 24-pin SOIC. It supports data rates up to 120 kB/s, provides approximately 9 V driver output swing from the 5 V supply, and operates with 1 uF capacitors according to the manufacturer feature summary. The device is designed for EIA-232-E and V.28 interfaces where traditional positive and negative ±12 V supplies are unavailable. An RS-232 transceiver is an interface IC that combines differential signaling drivers and receivers for point-to-point serial communication. The ADM238LJR belongs to the RS-232 interface transceiver category, where the transmitter converts logic-level signals into RS-232-compatible levels and the receiver converts those levels back into CMOS-compatible signals. Its four independent channels support bidirectional data paths in equipment requiring more than one serial connection. The integrated DC-DC converter allows the IC to generate the positive and negative voltages needed by RS-232 drivers from one 5 V supply. This reduces external power-supply complexity while preserving the required bipolar signaling levels. The manufacturer lists approximately 9 V output swing, low-power shutdown, receivers that remain active during shutdown, and 1 uF external capacitors as key operating characteristics. The ADM2xx family supports EIA-232-E and V.28 communications interfaces, and the driver architecture is designed for data transmission beyond the formal EIA-232-E rate. The ADM238LJR combines four transmit channels and four receive channels in one device, making it suitable for console links, instrumentation, industrial control equipment, and legacy peripheral connectivity. A single IC can serve multiple RS-232 ports while centralizing supply and decoupling requirements. Common application areas include industrial controllers, test and measurement equipment, point-of-sale terminals, security systems, and embedded systems that retain an RS-232 interface. The 24-pin SOIC package is suitable for conventional surface-mount PCB assembly. Designers should maintain the required charge-pump capacitor connections and place bypass and charge-pump capacitors close to their associated pins according to the manufacturer datasheet layout guidance. The principal design trade-off is that its four-driver, four-receiver arrangement is more specialized than single-channel transceivers. It provides higher channel density and simpler 5 V-only power design, but applications needing only one RS-232 link may not use every channel. Input protection, cable length, grounding, and data-rate limits must be evaluated against the EIA-232-E and V.28 interface requirements. This page organizes the ADM238LJR specifications, pin-compatible family alternatives, application guidance, and comparison criteria to support component selection and PCB planning. It also identifies the documentation and electrical details that require confirmation in the Analog Devices data sheet before production release.

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ADM239LAN - 5V 3/5 RS-232 Transceiver | Analog Devices
ADM239LAN

ADM239LAN - 5V 3/5 RS-232 Transceiver | Analog Devices

The Analog Devices ADM239LAN is a 5 V powered CMOS RS-232 transceiver combining three drivers and five receivers in a 24-pin PDIP package. It supports data rates up to 120 kB/s, meets the EIA-232-E and V.28 specifications cited in the manufacturer documentation, and provides an on-board DC-DC converter that produces a 9 V output swing from the single 5 V supply. These characteristics make the ADM239LAN useful for industrial equipment, data acquisition systems, and service interfaces where a compact multichannel RS-232 solution is required. An RS-232 transceiver is an interface IC that translates between complementary logic-level signals and the voltage levels defined by the EIA-232 standard. A transmitter converts logic data into RS-232 line signals, while a receiver converts incoming line signals back into CMOS-compatible data. In the broader semiconductor hierarchy, the ADM239LAN is a line driver and receiver, then an interface transceiver, and ultimately an interface IC. Its three transmitters permit three outgoing data channels, while its five receivers provide five incoming channels. The principal features of the ADM239LAN are its single 5 V supply operation, 120 kB/s data rate, integrated DC-DC conversion, approximately 9 V output swing, low-power shutdown capability, and receiver operation during shutdown. The integrated DC-DC converter eliminates the need for a separate external RS-232 charge-pump supply in applications where the 5 V system rail is already available. The shutdown function can reduce consumption when the interface is not actively communicating. The verified manufacturer-related search information identifies the ADM239LAN as a 5 V powered CMOS RS-232 driver and receiver device and confirms the 3/5 channel arrangement through the available comparison result. The listed package is 24-pin PDIP, which provides a through-hole footprint with widely spaced leads for easier inspection and assembly. Detailed pin names, receiver input thresholds, supply-current limits, and operating-temperature limits were not included in the supplied verification data and therefore are not inferred here. Typical uses include multiport industrial controller connections, laboratory instrument control, point-of-sale equipment, and embedded systems that need several RS-232 channels sharing one logic-level supply. The integrated DC-DC approach is particularly useful where board space is constrained. System designers should still account for the higher line-side voltage, maintain appropriate RS-232 grounding, and verify transient protection for cables connected to external equipment. This page combines the verified ADM239LAN specifications, package information, purchasing-source links, interface application guidance, and a conservative drop-in replacement assessment. It distinguishes electrically similar family members from alternatives that require a different package or an engineering review, helping engineers avoid assuming that a similar RS-232 device is pin-compatible.

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