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HomeProductsIntegrated Circuits (ICs)Interface - Drivers, Receivers, TransceiversADM238LAR-REEL
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ADM238LAR-REEL - Analog Devices Inc.

Manufacturer Part Number
ADM238LAR-REEL
Manufacturer
Analog Devices, Inc.
Allelco Part Number
32D-ADM238LAR-REEL
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
3,990 pcs available, New & Original
Parts Description
IC TRANSCEIVER FULL 4/4 24SOIC
Package
24-SOIC
Data sheet
ADM238LAR-REEL.pdf

PCN Obsolescence/ EOL

Cylindrical Battery Holders.pdf

Other Related Documents

Tape and Reel Packaging.pdf
RoHs Status
 
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Specifications

ADM238LAR-REEL Tech Specifications
Analog Devices Inc. - ADM238LAR-REEL technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. - ADM238LAR-REEL

Product Attribute Attribute Value
Manufacturer Analog Devices, Inc.
Voltage - Supply 4.75V ~ 5.25V
Type Transceiver
Supplier Device Package 24-SOIC
Series -
Receiver Hysteresis 650 mV
Protocol RS232
Package / Case 24-SOIC (0.295', 7.50mm Width)
Product Attribute Attribute Value
Package Tape & Reel (TR)
Operating Temperature -40°C ~ 85°C
Number of Drivers/Receivers 4/4
Mounting Type Surface Mount
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

Parts Introduction

ADM238LAR-REEL Image
ADM238LAR-REEL (1)

Manufacturer Part Number

ADM238LAR-REEL

Manufacturer

analog-devices

Introduction

The ADM238LAR-REEL is a 4-channel, full-duplex, RS232 transceiver from Analog Devices. It is designed to provide an interface between digital logic and RS232 serial communication lines.

Product Features and Performance

4 independent driver/receiver channels

Full-duplex operation

Data rates up to 120 Kbps

650 mV receiver hysteresis

Operates from a single 5V supply

Wide operating temperature range of -40°C to 85°C

Surface mount 24-SOIC package

Product Advantages

Compact surface mount package

Integrated transceiver functionality

High data rate support

Wide temperature range

Key Reasons to Choose This Product

Reliable RS232 interface solution

Space-saving design

Ease of integration into various applications

Robust performance across a wide temperature range

Quality and Safety Features

ESD protection on all pins

Overcurrent protection on driver outputs

Meets relevant RS232 signal level and timing specifications

Compatibility

The ADM238LAR-REEL is compatible with standard RS232 serial communication interfaces.

Application Areas

Industrial automation and control systems

Embedded systems

Telecommunications equipment

Medical devices

Point-of-sale terminals

Product Lifecycle

The ADM238LAR-REEL is an obsolete product. Customers should contact our website's sales team for information on alternative or equivalent products that may be available.

Frequently Asked Questions(FAQ)

What are the key electrical characteristics of the ADM238LAR-REEL transceiver that influence RS232 signal integrity in industrial environments?
The ADM238LAR-REEL achieves a data rate of 120 kbps, which is sufficient for most serial communication applications but may require careful PCB layout to maintain signal integrity at longer cable lengths. Its receiver hysteresis of 650 mV provides noise immunity by preventing false triggering from slow-edge or noisy signals, making it suitable for electrically noisy industrial settings where ground potential differences exist between subsystems.
How does the supply voltage range of the ADM238LAR-REEL compare with other common RS232 transceivers like the MAX238, and what implications does this have for system power design?
The ADM238LAR-REEL operates within a 4.75V to 5.25V supply range, closely matching the nominal 5V requirement of many legacy systems. This narrow tolerance aligns well with standard digital logic levels, offering compatibility without requiring additional voltage regulation. In comparison, some variants of the MAX238 support slightly wider ranges (e.g., 3.0V–5.5V), providing greater flexibility in low-power designs, though at the cost of reduced output swing and potentially lower noise margins in harsh environments.
What are the thermal and reliability considerations when deploying the ADM238LAR-REEL in compact embedded systems with limited airflow?
With an operating temperature range of -40°C to 85°C, the ADM238LAR-REEL meets industrial-grade requirements and functions reliably in ambient conditions typical of enclosed control cabinets. However, its performance is not derated based on junction temperature, so sustained high data rates near the 120 kbps limit may increase internal power dissipation. Designers should ensure adequate trace routing and avoid placing the device adjacent to heat-generating components to prevent local hotspots affecting long-term stability.
Why might an engineer choose the ADM238LAR-REEL over alternative solutions such as the MAX232 despite differences in pin count and integration level?
While the MAX232 integrates charge pumps in a smaller package, the ADM238LAR-REEL offers a direct CMOS interface with no external capacitors required for level shifting—reducing BOM cost and board space. Its full-duplex 4/4 configuration supports complex multi-node communication architectures more efficiently than half-duplex alternatives. For applications where simplicity and deterministic timing matter more than ultra-compact form factor, the ADM238LAR-REEL’s straightforward design reduces risk in timing-critical serial protocols.
What design precautions should be taken when using the ADM238LAR-REEL in systems powered by unregulated DC sources?
Since the ADM238LAR-REEL requires a tightly regulated 5V supply between 4.75V and 5.25V, input voltages outside this range can cause latch-up or degraded output swing. A low-dropout linear regulator with adequate bypassing (e.g., 10 µF tantalum plus 0.1 µF ceramic) is recommended. Additionally, reverse polarity protection via a series diode or P-channel MOSFET prevents catastrophic failure if wiring errors occur during field maintenance.
Can the ADM238LAR-REEL drive long RS232 cables effectively, and how does this compare to newer LVDS-based alternatives?
At 120 kbps, the ADM238LAR-REEL can typically drive cables up to 50 feet using standard RS232 cabling, assuming proper termination and shielding. Beyond this, signal attenuation and crosstalk become limiting factors. While LVDS-based transceivers offer superior speed and noise rejection over much greater distances, they are incompatible with legacy RS232 infrastructure. For retrofit scenarios requiring backward compatibility, the ADM238LAR-REEL remains a pragmatic choice despite its bandwidth constraints.
What role does receiver hysteresis play in the ADM238LAR-REEL’s robustness against EMI-induced glitches?
The 650 mV receiver hysteresis creates a "dead zone" around the threshold voltage, ensuring that small voltage spikes or slow transitions due to electromagnetic interference do not cause unintended state changes. This feature enhances noise margin in environments with switching power supplies or motor-driven loads, where inductive kickback can induce transient voltages on communication lines.
Are there any known limitations in substituting the ADM238LAR-REEL with the MAX238EWG+ in existing designs, particularly regarding package and electrical behavior?
Both devices share similar electrical characteristics, but the MAX238EWG+ uses a different package (TSSOP-16) and has fewer drivers/receivers (2/3 vs. 4/4). Substituting directly would require significant PCB redesign unless only partial functionality is needed. Additionally, the MAX238EWG+ lacks the same level of built-in protection against ESD events, potentially increasing susceptibility in high-static environments. Careful validation of signal integrity and driver loading is essential before migration.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc. ADM238LAR-REEL

Product Attribute ADM238LARZ-REEL ADM238LJRZ-REEL ADM238LJR-REEL ADM237LJR-REEL
Part Number ADM238LARZ-REEL ADM238LJRZ-REEL ADM238LJR-REEL ADM237LJR-REEL
Manufacturer Analog Devices Inc. Analog Devices Inc. Analog Devices Inc. Analog Devices Inc.
Type - - - -
Receiver Hysteresis - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Number of Drivers/Receivers - - - -
Data Rate - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Mounting Type - Surface Mount Through Hole Surface Mount
Series - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Duplex - - - -
Protocol - - - -
Voltage - Supply - - - -

ADM238LAR-REEL Datasheet PDF

Download ADM238LAR-REEL pdf datasheets and Analog Devices Inc. documentation for ADM238LAR-REEL - Analog Devices Inc..

Datasheets
Cylindrical Battery Holders.pdf
PCN Obsolescence/ EOL
Cylindrical Battery Holders.pdf
Other Related Documents
Tape and Reel Packaging.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

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Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
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We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
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Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


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Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
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  • ISO 28000: 2007
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ADM238LAR-REEL Image

ADM238LAR-REEL

Analog Devices Inc.
32D-ADM238LAR-REEL

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