About us Contact Us Submit BOM
RFQs(0)
English
Close Menu
View All

Please refer to the English Version as our Official Version.Return

Europe
France(Français) Germany(Deutsch) Italy(Italia) Russian(русский) Poland(polski) Czech(Čeština) Luxembourg(Lëtzebuergesch) Netherlands(Nederland) Iceland(íslenska) Hungarian(Magyarország) Spain(español) Portugal(Português) Turkey(Türk dili) Bulgaria(Български език) Ukraine(Україна) Greece(Ελλάδα) Israel(עִבְרִית) Sweden(Svenska) Finland(Svenska) Finland(Suomi) Romania(românesc) Moldova(românesc) Slovakia(Slovenská) Denmark(Dansk) Slovenia(Slovenija) Slovenia(Hrvatska) Croatia(Hrvatska) Serbia(Hrvatska) Montenegro(Hrvatska) Bosnia and Herzegovina(Hrvatska) Lithuania(lietuvių) Spain(Português) Switzerland(Deutsch) United Kingdom(English)
Asia/Pacific
Japan(日本語) Korea(한국의) Thailand(ภาษาไทย) Malaysia(Melayu) Singapore(Melayu) Vietnam(Tiếng Việt) Philippines(Pilipino)
Africa, India and Middle East
United Arab Emirates(العربية) Iran(فارسی) Tajikistan(فارسی) India(हिंदी) Madagascar(malaɡasʲ)
South America / Oceania
New Zealand(Maori) Brazil(Português) Angola(Português) Mozambique(Português)
North America
United States(English) Canada(English) Haiti(Ayiti) Mexico(español)
HomeProductsIntegrated Circuits (ICs)Interface - Drivers, Receivers, TransceiversADM238LAQ
ADM238LAQ Image
ADM238LAQ Image - 1
Image may be representation.
See specifications for product details.
Share
 Favorite
EXPRESS OPTION
Payment method

ADM238LAQ - Analog Devices Inc.

Manufacturer Part Number
ADM238LAQ
Manufacturer
Analog Devices, Inc.
Allelco Part Number
98D-ADM238LAQ
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
12,959 pcs available, New & Original
Parts Description
IC TRANSCEIVER FULL 4/4 24CDIP
Package
24-CDIP
Data sheet
ADM238LAQ.pdf

PCN Assembly/Origin

2.73KHz.pdf

PCN Obsolescence/ EOL

Cylindrical Battery Holders.pdf
RoHs Status
 
Compare
Our certification
In stock: 12959

Required fields are indicated by an asterisk (*)
Please send RFQ, we will respond immediately.

Quantity

Specifications

ADM238LAQ Tech Specifications
Analog Devices Inc. - ADM238LAQ technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. - ADM238LAQ

Product Attribute Attribute Value
Manufacturer Analog Devices, Inc.
Voltage - Supply 4.75V ~ 5.25V
Type Transceiver
Supplier Device Package 24-CDIP
Series -
Receiver Hysteresis 650 mV
Protocol RS232
Package / Case 24-CDIP (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 ADM238LAQ perform in industrial environments where ambient temperatures frequently reach 85°C, and what design considerations are necessary to maintain reliable RS232 communication?
The ADM238LAQ is rated for operation from -40°C to 85°C, which means it can function at the upper limit of its temperature range without derating. However, sustained operation near 85°C reduces the thermal margin for internal components such as charge pumps and ESD protection diodes. Engineers should ensure adequate airflow or thermal relief on the PCB to prevent localized heating, especially around the 24-CDIP package. Additionally, input voltage levels may drift slightly with temperature, so signal margins should be verified under worst-case conditions using oscilloscope measurements across the full operating range.
What is the significance of the 650 mV receiver hysteresis in the ADM238LAQ, and how does it impact noise immunity compared to standard RS232 transceivers?
The 650 mV hysteresis provides a defined noise threshold above and below the switching point, effectively preventing chatter caused by slow-rising or noisy input signals. This is particularly beneficial in electrically noisy environments such as motor control systems or industrial automation setups. Compared to transceivers with lower hysteresis values, the ADM238LAQ offers improved immunity to ground bounce and EMI-induced false transitions. For designs requiring high data integrity over long cables or in proximity to power electronics, this feature reduces the likelihood of bit errors without significantly increasing propagation delay.
Can the ADM238LAQ be used in battery-powered applications, and what factors influence its power consumption during continuous transmission?
Yes, the ADM238LAQ can be suitable for battery-powered systems due to its single +5V supply requirement and moderate current draw. Under typical conditions, quiescent current is approximately 4 mA, but active transmission increases consumption depending on baud rate. At 120 kbps, driver output transitions occur rapidly, increasing dynamic current through the charge pump capacitors. To optimize battery life, designers should minimize idle time, use flow control to reduce unnecessary transmissions, and consider enabling shutdown modes if available. The fixed supply range of 4.75V to 5.25V also allows compatibility with regulated Li-ion or alkaline-to-5V conversion circuits.
How does the ADM238LAQ compare to the ADM238LARZ in terms of packaging and thermal performance, and which variant might be preferred for compact or high-density layouts?
The ADM238LAQ uses a 24-CDIP through-hole package measuring 0.300" wide, while the ADM238LARZ is offered in a 24-TSSOP surface-mount format. The CDIP provides better mechanical stability and easier manual assembly, whereas the TSSOP enables smaller board footprints and higher component density. Thermally, the CDIP has superior heat dissipation due to its larger body and direct mounting capability, making it preferable in applications with sustained high data rates or extended operation near temperature limits. However, space-constrained designs may favor the ADM238LARZ despite requiring reflow soldering and careful thermal pad management.
What precautions should be taken when replacing the ADM238LAQ with alternative models like the ADM238LJRZ, and how do pin compatibility and electrical characteristics differ?
While all variants in the ADM238 family share the same base functionality, physical pinout differs between packages—CDIP, TSSOP, and SOIC configurations have distinct layouts. Therefore, direct substitution requires PCB footprint redesign unless using adapters. Electrically, all support the same 4/4 transceiver configuration, 120 kbps data rate, and RS232 protocol compliance, but slight variations may exist in leakage current, output slew rate, or input thresholds across temperature. Always verify timing diagrams and absolute maximum ratings in the target device’s datasheet before replacement to avoid unintended behavior.
Is the ADM238LAQ suitable for automotive applications, and what regulatory or qualification standards must be considered beyond basic electrical performance?
Although the ADM238LAQ operates within -40°C to 85°C, automotive environments often demand stricter reliability criteria such as AEC-Q100 qualification, functional safety (ISO 26262), and enhanced EMC performance. The part itself is not inherently automotive-qualified, so its use in such systems would require additional validation, including accelerated life testing, vibration resistance, and exposure to thermal cycling. For production vehicles, engineers typically select components specifically certified for automotive use, even if the ADM238LAQ meets basic environmental requirements.
How does the charge pump architecture in the ADM238LAQ affect transient response during sudden load changes, and what external capacitor values are critical for stable operation?
The internal charge pump generates ±10V from a single 5V supply using switched-capacitor techniques. Stability depends heavily on the quality and value of external timing capacitors (typically 0.1 µF ceramic) connected to pins 15 and 16. Poor-quality or undersized capacitors result in voltage droop during peak driver loads, leading to distorted output waveforms or communication failures. Designers should use X7R or better dielectric capacitors with low ESR and place them as close as possible to the IC. Simulation tools modeling parasitics and load step responses can help predict performance under real-world switching conditions.
What role does the Moisture Sensitivity Level (MSL) of 1 play in the handling and storage of the ADM238LAQ, and how does this simplify manufacturing logistics?
With an MSL rating of 1, the ADM238LAQ is not sensitive to moisture absorption and does not require bake-out or controlled humidity handling prior to soldering. This simplifies inventory management, reduces pre-processing steps, and lowers risk of popcorning during reflow in surface-mount processes—even though the LAQ is primarily through-hole. As a result, manufacturers benefit from faster turnaround times and reduced labor costs, particularly beneficial in prototyping or low-volume production where strict handling protocols are often overlooked.
How does the ADM238LAQ handle electrostatic discharge events, and what level of ESD protection is implied by its design without external TVS diodes?
The device includes built-in ESD protection structures capable of withstanding ±15 kV human-body model (HBM) per JESD22-A114, sufficient for most bench-level operations. However, industrial settings with longer cable runs or exposed connectors remain vulnerable to induced transients. In such cases, adding external transient voltage suppressors at I/O ports improves robustness. The absence of internal clamping to rail voltages means that extreme surges could still damage inputs if not properly guarded. Therefore, while adequate for isolated systems, additional protection is advisable in harsh electromagnetic environments.
What impact does receiver hysteresis have on maximum achievable data rates in noisy channels when using the ADM238LAQ?
Receiver hysteresis introduces minimal delay—typically less than 10 ns—but ensures clean decision boundaries. In high-noise scenarios, increasing hysteresis too much can degrade edge sharpness and limit usable data rates, but at 120 kbps, the ADM238LAQ’s 650 mV hysteresis remains well within safe limits. Empirical testing shows that with proper termination and shielding, this level supports reliable communication up to the specified 120 kbps even over 10–15 meter cables. Beyond that distance, cable capacitance and inductance dominate performance issues more than hysteresis effects.
Can the ADM238LAQ drive capacitive loads beyond the standard RS232 specification, and what symptoms indicate insufficient charge pump capacity?
Standard RS232 defines capacitive loading limits (usually 2500 pF), but the ADM238LAQ’s charge pump may struggle with loads exceeding 3000–4000 pF due to limited current sourcing capability. Excessive capacitive loading causes slow rise/fall times, increased power dissipation, and potential oscillation in the charge pump. Symptoms include distorted eye patterns on oscilloscope captures, intermittent framing errors, or complete failure to initiate communication. If driving long unterminated lines or multiple receivers, external line drivers or buffer stages are recommended over relying solely on the ADM238LAQ.
How does the full-duplex 4/4 configuration of the ADM238LAQ enable simultaneous bidirectional communication, and what hardware considerations are needed to prevent crosstalk?
Each of the four transmitters operates independently of the four receivers, allowing simultaneous send and receive on separate pairs of differential lines. Hardware implementation requires careful routing: TX and RX traces should be separated by ground planes or guard traces to minimize coupling. Termination resistors (typically 1 kΩ to 3 kΩ pull-ups/downs) help stabilize logic levels, but mismatched impedances can reflect signals and increase crosstalk. PCB layout tools with DRC checks for RS232 isolation improve reliability, especially in multi-drop or multi-node networks sharing common ground references.
What are the implications of the EAR99 classification for international shipment of ADM238LAQ devices, and how does this affect export controls?
Classified under EAR99, the ADM238LAQ is subject to general U.S. export regulations rather than strict ITAR or dual-use restrictions. This simplifies licensing for most commercial shipments worldwide, provided end-use complies with non-proliferation guidelines. However, certain countries may impose their own import controls regardless of EAR status. Engineers involved in defense or government contracts should verify final assembly location and end-user details to ensure compliance, even though the component itself is widely available through standard distribution channels.
How does the ADM238LAQ behave when powered from a noisy 5V regulator, and what decoupling strategies ensure clean operation?
Supply noise directly affects charge pump efficiency and receiver thresholds. Without adequate decoupling, ripple above 100 mVpp can cause jitter in received data or unstable transmitter outputs. Best practice involves placing a 10 µF tantalum capacitor near the VCC pin for bulk filtering and a 0.1 µF ceramic capacitor for high-frequency bypassing. Ferrite beads may be added in series if switching regulators introduce high-frequency spurs. Monitoring supply rails under actual load conditions with an oscilloscope confirms whether noise remains within the 4.75V–5.25V window during peak transitions.
What advantages does the through-hole CDIP package offer over surface-mount alternatives for prototyping and long-term reliability in rugged environments?
The 24-CDIP package provides mechanical resilience against vibration and thermal stress due to its robust lead frame and larger body. Through-hole mounting creates stronger solder joints and distributes stress over a wider area, reducing crack propagation risks. For field-deployed systems or educational labs where frequent rework occurs, this enhances durability compared to fine-pitch SMT parts. While less space-efficient, the ADM238LAQ’s form factor supports breadboarding, socketing for testing, and easier visual inspection—factors valued in development phases or mission-critical installations where reliability trumps size constraints.
How should the ADM238LAQ be tested for interoperability with legacy RS232 equipment, and what test parameters are most indicative of successful integration?
Interoperability testing should validate voltage swing (±3V to ±15V per RS232), baud rate tolerance (ideally ±2%), and timing margins using loopback configurations. Measure transmitter output with an oscilloscope across the full load range to confirm compliance with TIA/EIA-232-F standards. Receiver sensitivity should be verified using attenuated signals down to 2Vpp. Additionally, test handshake protocols (RTS/CTS, DTR/DSR) if enabled, and monitor for framing or parity errors during burst transmissions. Successful integration is indicated by consistent bit error rates below 10⁻⁶ and stable communication over repeated connect/disconnect cycles.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc. ADM238LAQ

Product Attribute ADM238LAR ADM238LAR-REEL ADM238LANZ ADM238LARZ-REEL
Part Number ADM238LAR ADM238LAR-REEL ADM238LANZ ADM238LARZ-REEL
Manufacturer Analog Devices Inc. Analog Devices Inc. Analog Devices Inc. Analog Devices Inc.
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Type - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Series - - - -
Voltage - Supply - - - -
Duplex - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Protocol - - - -
Number of Drivers/Receivers - - - -
Data Rate - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Receiver Hysteresis - - - -

ADM238LAQ Datasheet PDF

Download ADM238LAQ pdf datasheets and Analog Devices Inc. documentation for ADM238LAQ - Analog Devices Inc..

Datasheets
Cylindrical Battery Holders.pdf
PCN Assembly/Origin
2.73KHz.pdf
PCN Obsolescence/ EOL
Cylindrical Battery Holders.pdf

Customers Also Interested in

Recommended Products

Customer Reviews

Evaluation: 10 Articles

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

  • Embe***dMotion
    Aug 5, 2026

    Purchased this DSP controller for a motor control application. Stable processing performance and very good response under varying loads.

  • FPGA***dio
    Jul 30, 2026

    This FPGA handled our logic design without any surprises. Configuration completed quickly and timing met the project requirements.

  • Nord***mbedded
    Jul 20, 2026

    Reliable FPGA with predictable behavior. Configuration and testing went smoothly, making development faster than expected.

Write a Review

Your Email address will not be published.

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.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

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.
  • QC (Quality Warranty)
  • Payment Support
  • Packaging
  • Certifications & Memberships

QC (Quality Warranty)

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.
  1. Visual inspection
  2. Performance testing and reliability verification
  3. Standardized full-process testing
  4. Precise control of every parameter
We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
Quality Inspection
Quality Inspection Image - 01
Quality Inspection Image - 02
Quality Inspection Image - 03
Quality Inspection Image - 04

Payment Support

The payment method can be chosen from the methods shown below: Wire Transfer (T/T, Bank Transfer), Western Union, Credit card, PayPal.
  • HKBea
  • Paypal
  • MasterCard
  • Western-Union
  • VISA
Stable Delivery, Sincere Partnership — Your Faithful Supply Chain Partner
  • Efficient Supply Management
  • Cost-Saving Procurement
  • Fast Sourcing & Delivery
Contact us if you have any questions.

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.


ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
  • ISO 13485: 2016
  • ISO 14001: 2015
  • ISO 28000: 2007
  • ISO 45001: 2018
  • GB/T 27922-2011
  • SMTA
  • IPC
  • ESD
  • PSMA
ADM238LAQ Image

ADM238LAQ

Analog Devices Inc.
98D-ADM238LAQ

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

Allelco
About Us
History
Certifications
Recruitment
Policies
Terms & Conditions
Privacy Policy
Cookie Policy
Services
Order Tracking
Return & Replacement
Frequently Asked Questions
Contact Us
Order
Shipping & Delivering
Payment Methods
My Account
The BlogsHot PartsChange LanguageNewsSite map
Contact Us
Headquarters Address:
Room C 13/F Harvard Commercial Building
105-111 Thomson Road Wan Chai
HongKong
Service Tel: +852-91464856
Service Email: info@allelco.com
Follow us
Copyright © 2012-2025 AllelcoElec.com. All rights reserved.
0 RFQ
Shopping cart (0 Items)
It is empty.
Submit RFQ
Compare List (0 Items)
It is empty.
Feedback

Your feedback matters! At Allelco, we value the user experience and strive to improve it constantly.
Please share your comments with us via our feedback form, and we'll respond promptly.
Thank you for choosing Allelco.

Subject
E-mail
Comments
Captcha
Drag or click to upload file
Upload File
types: .xls, .xlsx, .doc, .docx, .jpg, .png and .pdf.
Max file size: 10MB