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HomeProductsIntegrated Circuits (ICs)Interface - Drivers, Receivers, TransceiversADM238LAN
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ADM238LAN - Analog Devices Inc.

Manufacturer Part Number
ADM238LAN
Manufacturer
Analog Devices, Inc.
Allelco Part Number
98D-ADM238LAN
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
14,697 pcs available, New & Original
Parts Description
IC TRANSCEIVER FULL 4/4 24DIP
Package
24-PDIP
Data sheet
ADM238LAN.pdf

PCN Obsolescence/ EOL

Multiple Devices 29/Jan/2014.pdf
RoHs Status
 
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Specifications

ADM238LAN Tech Specifications
Analog Devices Inc. - ADM238LAN technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. - ADM238LAN

Product Attribute Attribute Value
Manufacturer Analog Devices, Inc.
Voltage - Supply 4.75V ~ 5.25V
Type Transceiver
Supplier Device Package 24-PDIP
Series -
Receiver Hysteresis 650 mV
Protocol RS232
Package / Case 24-DIP (0.300", 7.62mm)
Product Attribute Attribute Value
Package Tube
Operating Temperature -40°C ~ 85°C
Number of Drivers/Receivers 4/4
Mounting Type Through Hole
Duplex Full
Data Rate 120Kbps
Base Product Number ADM238

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
Moisture Sensitivity Level (MSL) 1 (Unlimited)
ECCN EAR99
HTSUS 8542.39.0001

Frequently Asked Questions(FAQ)

How does the ADM238LAN compare to the MAX238ENG+ in terms of supply voltage tolerance and temperature range for industrial applications?
The ADM238LAN operates within a supply voltage range of 4.75V to 5.25V, which aligns closely with standard 5V logic systems, while the MAX238ENG+ typically supports a slightly broader range from 3V to 5.5V, offering greater flexibility in low-voltage designs. Both devices share an identical operating temperature specification of -40°C to 85°C, making them suitable for industrial environments. However, the ADM238LAN’s tighter voltage tolerance may provide better noise immunity in stable 5V systems, whereas the MAX238ENG+ offers improved compatibility with mixed-voltage platforms. This distinction becomes relevant when selecting between legacy 5V designs and modern low-power implementations.
What are the key design considerations when integrating the ADM238LAN into a full-duplex RS232 system using through-hole mounting?
When designing with the ADM238LAN in a full-duplex configuration, engineers must account for its 24-DIP package footprint and through-hole mounting requirements, which demand sufficient PCB real estate and proper soldering profiles to avoid thermal stress. The device supports data rates up to 120 kbps with full-duplex 4/4 driver/receiver capability, enabling simultaneous bidirectional communication. Careful attention to supply decoupling—especially given its 4.75V to 5.25V operating window—is essential to maintain signal integrity at higher baud rates. Additionally, external charge pumps or capacitor networks required for RS232 level generation must be sized according to Analog Devices’ layout recommendations to ensure reliable ±12V output swing.
Why might an engineer choose the ADM238LAN over alternative RS232 transceivers like the MAX238CNG+ despite similar pin counts and protocols?
While both the ADM238LAN and MAX238CNG+ offer 4/4 full-duplex RS232 functionality in DIP packages, the ADM238LAN provides 650 mV of receiver hysteresis, which enhances noise margin in electrically noisy environments by preventing false triggering near threshold voltages. This can improve reliability in systems with long cable runs or high EMI exposure. Additionally, Analog Devices' ADM238LAN may offer better consistency in production batches due to Analog Devices’ advanced manufacturing processes, potentially reducing field failures compared to Maxim Integrated (now part of Analog Devices) variants like the MAX238CNG+. Designers prioritizing robustness in harsh conditions may favor this trade-off even if other parameters appear similar.
Can the ADM238LAN operate reliably at data rates approaching 120 kbps over standard RS232 cable lengths without signal degradation?
The ADM238LAN is specified for data rates up to 120 kbps, but practical performance depends on cable length, capacitance, and environmental noise. Standard RS232 specifications recommend limiting cable runs to under 15 meters for reliable operation at this rate. At 120 kbps, accumulated capacitance and inductance in long cables can distort edges and introduce timing errors. While the device includes internal slew rate control and robust ESD protection, exceeding recommended cable lengths without signal conditioning (e.g., line drivers or repeaters) risks data corruption. Therefore, achieving consistent performance at the maximum rated speed typically requires careful cabling practices and possibly termination strategies.
How does the receiver hysteresis of 650 mV in the ADM238LAN impact noise immunity compared to transceivers with lower hysteresis values?
The 650 mV receiver hysteresis in the ADM238LAN creates a wider input threshold band, meaning the receiver only switches states after the input signal crosses the active threshold by that amount in either direction. This effectively filters out small noise spikes near the switching point, improving immunity to electromagnetic interference (EMI) and ground potential differences. In contrast, transceivers with lower hysteresis (e.g., 300–400 mV) may oscillate or generate spurious transitions when inputs fluctuate rapidly near the decision boundary. For industrial RS232 links exposed to motor noise or long unshielded cables, the ADM238LAN’s hysteresis contributes significantly to stable communication, particularly at moderate baud rates where signal settling time is less critical than noise rejection.
What are the implications of using the ADM238LAN in a system requiring hot-swapping or frequent connector mating cycles?
Hot-swapping presents challenges for the ADM238LAN due to its reliance on external charge pumps to generate RS232-level voltages (±10V to ±15V). When connectors are mated or disconnected while powered, transient currents can flow through protection diodes and parasitic paths, potentially stressing internal circuits. Although the device includes some ESD protection, it is not rated for continuous hot-plug scenarios. Engineers should implement series resistors on TX lines, use TVS diodes on I/O pins, and consider enabling power sequencing to avoid latch-up during insertion events. These measures help mitigate risk but do not eliminate the need for external safeguards in dynamic connection environments.
How does the ADM238LAN’s supply voltage range influence its compatibility with modern 3.3V microcontroller UART interfaces?
The ADM238LAN operates from 4.75V to 5.25V, which means it cannot be directly powered from a 3.3V microcontroller supply. To interface with 3.3V logic, designers must either use a 5V-compatible regulator or employ level-shifting circuitry on the TX/RX lines. Direct connection risks damaging the transceiver if the 3.3V logic exceeds its input tolerance. Alternatively, some microcontrollers support software-configurable UART voltage levels, but verification against the ADM238LAN’s absolute maximum ratings is necessary. A safer approach involves using dedicated level translators or choosing a transceiver with built-in 3.3V support, unless system-wide 5V operation is already established.
In what scenarios would substituting the ADM238LAN with the ADM238LANZ (z-package variant) require changes to the printed circuit board layout?
The ADM238LANZ is a lead-free version of the ADM238LAN, typically available in surface-mount packaging such as SOIC or TSSOP, unlike the through-hole PDIP of the LAN variant. Migrating from ADM238LAN to ADM238LANZ therefore necessitates redesigning the PCB footprint, adjusting solder paste stencils, and modifying assembly processes for reflow soldering instead of wave soldering. Thermal performance may also differ due to smaller package size and reduced copper area, affecting heat dissipation during prolonged high-speed operation. Unless space constraints or manufacturing capabilities favor SMT, the LAN version remains preferable for legacy or hand-assembled designs requiring through-hole components.
What factors should be evaluated when selecting between the ADM238LAN and a modern integrated RS232 transceiver with built-in charge pump?
The ADM238LAN uses an external dual-supply charge pump to generate RS232 signaling levels, requiring additional capacitors and discrete components. In contrast, newer transceivers integrate the charge pump internally, simplifying PCB layout and reducing component count. If space, power efficiency, or ease of integration is critical—such as in portable or compact embedded systems—the integrated solution may be more attractive despite potentially lower data rates or narrower supply ranges. However, the ADM238LAN’s proven reliability in industrial settings and compatibility with existing through-hole tooling may justify its use in mature or high-reliability designs where simplicity and proven performance outweigh miniaturization benefits.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc. ADM238LAN

Product Attribute ADM238LANZ ADM238LAQ ADM238LJN ADM238LAR
Part Number ADM238LANZ ADM238LAQ ADM238LJN ADM238LAR
Manufacturer Analog Devices Inc. Analog Devices Inc. Analog Devices Inc. Analog Devices Inc.
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Duplex - - - -
Series - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Protocol - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Data Rate - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Type - - - -
Number of Drivers/Receivers - - - -
Voltage - Supply - - - -
Receiver Hysteresis - - - -

ADM238LAN Datasheet PDF

Download ADM238LAN pdf datasheets and Analog Devices Inc. documentation for ADM238LAN - Analog Devices Inc..

Datasheets
ADM231L-234L, ADM236L-241L.pdf
PCN Obsolescence/ EOL
Multiple Devices 29/Jan/2014.pdf

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ADM238LAN Image

ADM238LAN

Analog Devices Inc.
98D-ADM238LAN

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