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HomeProductsIntegrated Circuits (ICs)Interface - Drivers, Receivers, TransceiversADM238LJRZ-REEL
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ADM238LJRZ-REEL - Analog Devices Inc.

Manufacturer Part Number
ADM238LJRZ-REEL
Manufacturer
Analog Devices, Inc.
Allelco Part Number
32D-ADM238LJRZ-REEL
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
7,012 pcs available, New & Original
Parts Description
IC TRANSCEIVER FULL 4/4 24SOIC
Package
24-SOIC
Data sheet
ADM238LJRZ-REEL.pdf

PCN Assembly/Origin

2.73KHz.pdf

Other Related Documents

Tape and Reel Packaging.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 7012
  • Unit Price: $3.258
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $3.258 $3.26
200+ $1.261 $252.20
500+ $1.217 $608.50
1000+ $1.195 $1,195.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

ADM238LJRZ-REEL Tech Specifications
Analog Devices Inc. - ADM238LJRZ-REEL technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. - ADM238LJRZ-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 0°C ~ 70°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
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

ADM238LJRZ-REEL Image
ADM238LJRZ-REEL (1)

Manufacturer Part Number

ADM238LJRZ-REEL

Manufacturer

analog-devices

Introduction

The ADM238LJRZ-REEL is a high-speed, quad, 5V RS-232 driver/receiver transceiver from Analog Devices. It is designed to provide a complete RS-232 interface in a single package, simplifying board layout and reducing component count.

Product Features and Performance

Quad (4 channels) driver/receiver transceiver

Full-duplex operation

High data rate up to 120 Kbps

Receiver input hysteresis of 650 mV

Operates from a single 5V power supply (4.75V to 5.25V)

Operating temperature range of 0°C to 70°C

Surface mount 24-SOIC package

Product Advantages

Integrated solution reduces component count and simplifies board design

High-speed operation up to 120 Kbps

Low power consumption

Wide operating voltage and temperature range

Key Reasons to Choose

Robust and reliable RS-232 interface in a compact package

Excellent performance characteristics for a wide range of applications

Cost-effective solution with Analog Devices' quality and reliability

Quality and Safety Features

Meets RS-232 specifications

ESD protection on all pins

Thermal shutdown and short-circuit protection

Compatibility

The ADM238LJRZ-REEL is compatible with standard RS-232 interfaces and can be used in a variety of applications that require serial data communication.

Application Areas

Industrial control systems

Instrumentation and measurement equipment

Point-of-sale terminals

Computer peripherals

Telecommunications equipment

Product Lifecycle

The ADM238LJRZ-REEL is an active product. There are equivalent or alternative models available, such as the ADM3222 and ADM3249 series. For more information on product lifecycle and alternative options, please contact our website's sales team.

Frequently Asked Questions(FAQ)

What is the maximum data rate for the ADM238LJRZ-REEL transceiver when operating over a standard RS232 cable with 15 feet of length and typical capacitive loading?
The ADM238LJRZ-REEL supports a maximum data rate of 120 kbps under standard RS232 conditions, which includes typical 15-foot cables and moderate capacitive loads. This specification assumes proper termination and minimal signal integrity degradation. While RS232 protocols can technically support higher speeds over shorter distances, the guaranteed performance up to 120 kbps accounts for real-world noise margins and driver/receiver limitations in this device. Exceeding this rate may result in increased bit error rates or complete communication failure depending on layout and environmental factors.
How does the ADM238LJRZ-REEL compare to the MAX238EWG+ in terms of supply voltage tolerance and receiver hysteresis during low-noise industrial environments?
Both the ADM238LJRZ-REEL and MAX238EWG+ operate within a supply range of 4.75V to 5.25V, ensuring compatibility across most 5V digital systems. However, the ADM238LJRZ-REEL provides 650 mV of receiver hysteresis, which offers superior noise immunity compared to many alternatives. In low-noise industrial settings where transient spikes are minimal, this hysteresis helps prevent false triggering on slow-edge signals without sacrificing sensitivity. The MAX238EWG+ typically matches these electrical characteristics, but component-specific variations in internal biasing can affect edge detection thresholds. Designers should verify threshold behavior under actual operating conditions rather than relying solely on datasheet averages.
Can the ADM238LJRZ-REEL be used in battery-powered applications requiring supply voltages below 4.75V, such as a 3.3V microcontroller interface?
No, the ADM238LJRZ-REEL requires a minimum supply voltage of 4.75V, making it unsuitable for direct connection to 3.3V logic systems without additional level-shifting circuitry. Attempting to power it from a 3.3V source risks undefined logic states, reduced output swing, and potential damage to internal ESD protection structures. In such cases, designers must use either a dedicated 5V regulator or an alternative transceiver compatible with 3.3V operation. The device’s full functionality—including its 120 kbps throughput and ±12V output capability—is only guaranteed within the specified 4.75V to 5.25V window.
What impact does ambient temperature have on the ADM238LJRZ-REEL's data transmission reliability between 0°C and 70°C?
Within the 0°C to 70°C operating range, the ADM238LJRZ-REEL maintains consistent performance including ±12V output levels and 120 kbps data rate, assuming stable power delivery and proper PCB layout. However, at elevated temperatures near 70°C, internal parasitic capacitances increase slightly, potentially reducing effective slew rates. This may manifest as degraded eye diagrams under high-speed or long-cable conditions. Conversely, near 0°C, semiconductor mobility decreases modestly, but the device remains functional due to sufficient headroom in timing margins. Thermal derating is not required within this range, but enclosure design should ensure adequate airflow to avoid localized hot spots that could exceed junction limits.
Is the ADM238LJRZ-REEL suitable for automotive RS232 communication requiring ISO 11898 compliance or fault-tolerant signaling?
No, the ADM238LJRZ-REEL is designed for industrial and commercial environments and does not meet automotive-grade standards such as AEC-Q100 or ISO 11898. It lacks built-in diagnostics, redundant channels, or enhanced EMC protection required for harsh automotive EMI conditions. While it supports full-duplex RS232 communication at up to 120 kbps, its immunity to radiated noise and electrostatic discharge falls short of automotive expectations. For vehicle networks, consider dedicated transceivers like those supporting CAN FD or LIN bus protocols instead.
How does the ADM238LJRZ-REEL handle input glitches when receiving RS232 signals through a noisy serial port connected to a legacy industrial sensor?
The ADM238LJRZ-REEL incorporates 650 mV of receiver hysteresis, which effectively filters out small voltage fluctuations caused by electromagnetic interference or ground loops common in industrial sensor interfaces. This prevents spurious transitions when input signals dip briefly into the invalid region. For example, if an RX line drops to 1.8V (within the ambiguous zone), the hysteresis ensures the comparator settles into a stable state based on previous transitions. This improves robustness without significantly impacting valid signal recognition—provided the noise amplitude remains below ~500 mV peak-to-peak. In practice, this allows reliable operation even with poorly shielded cabling or ungrounded sensors.
What are the key differences between the ADM238LJRZ-REEL and the MAX208CWG+ in multi-drop RS232 configurations using multiple drivers on a shared line?
The ADM238LJRZ-REEL contains four independent transmitter channels, each capable of driving ±12V differential outputs ideal for point-to-point or short multidrop links. In contrast, the MAX208CWG+ integrates five drivers and three receivers, enabling more complex topologies but with lower per-channel current drive capability. When sharing a single RS232 line among multiple nodes, the ADM238LJRZ-REEL requires external bus contention protection unless only one transmitter is active at a time. The MAX208’s built-in features like open-drain outputs offer better collision handling, but both devices demand careful impedance matching and termination to avoid reflections. Selection depends on whether flexibility or built-in safety dominates the design priority.
Can the ADM238LJRZ-REEL replace the MAX238EWG+T in a compact embedded system where board space is constrained to 24-SOIC footprint?
Yes, the ADM238LJRZ-REEL and MAX238EWG+T share identical pinouts and mechanical packaging (24-SOIC), allowing direct substitution in existing layouts. Both provide four transmit and four receive channels with similar electrical performance, including 120 kbps data rates and 650–750 mV receiver hysteresis ranges. However, minor variations in internal reference voltages and propagation delay distributions may cause timing skew in high-throughput applications. Unless precise synchronization is critical, drop-in replacement is feasible with identical power sequencing and decoupling requirements. Always validate signal integrity after migration.
Why might a designer choose the ADM238LJRZ-REEL over discrete MAX232-based solutions despite higher unit cost?
Although the ADM238LJRZ-REEL costs more per unit than a quad MAX232 solution, it eliminates the need for external charge pumps and bulk capacitors, reducing BOM count and PCB area. It also delivers faster rise/fall times and better noise margins due to optimized internal circuitry, resulting in more reliable operation at 120 kbps over longer cables. Additionally, the ADM238 integrates ESD protection to IEC 61000-4-2 Level 2, offering greater robustness than basic MAX232 implementations. For designs prioritizing integration, longevity, and reduced failure modes, the ADM238LJRZ-REEL justifies its premium in production volumes above 10k units.
Does the ADM238LJRZ-REEL require pull-up or pull-down resistors on unused receiver inputs to prevent floating logic states?
No explicit external resistors are mandated for unused receivers on the ADM238LJRZ-REEL. Internally, each receiver has defined high- and low-level thresholds with hysteresis, so floating inputs will eventually settle into a valid logic state based on leakage currents and parasitic coupling. However, in electrically noisy environments, adding a weak pull-up or pull-down resistor (e.g., 10 kΩ) to VCC or GND can improve immunity by preventing slow drift near threshold boundaries. This is particularly useful when multiple receivers share a long trace or when powered down sequences create undefined conditions.
What precautions should be taken when reflow soldering the ADM238LJRZ-REEL in a high-volume SMT assembly process?
As an MSL 1 component, the ADM238LJRZ-REEL has unlimited shelf life and no moisture sensitivity concerns, allowing standard lead-free reflow profiles. However, peak junction temperature must not exceed 260°C for more than 10 seconds to preserve internal oxide layers. Typical profiles ramp to 245°C peak over 60 seconds, followed by cooling at <4°C/sec. Avoid repeated thermal cycling during rework; instead, use hot-air tools briefly and uniformly. Proper solder paste printing and alignment are essential given the 7.5 mm SOIC width, which increases risk of bridging between adjacent pins.
How does the ADM238LJRZ-REEL’s ESD protection compare to newer RS232 transceivers supporting IEC 61000-4-2 Level 4?
The ADM238LJRZ-REEL provides basic ESD protection rated to ±15 kV air discharge and ±8 kV contact discharge per JEDEC standards, sufficient for office and light industrial use. Modern alternatives like the LTC1384 or SP3243E offer enhanced protection up to ±15 kV contact discharge, crucial for field-deployed equipment exposed to static buildup. While the ADM238LJRZ-REEL meets general requirements, systems in high-risk environments (e.g., handheld test tools, outdoor sensors) benefit from higher-rated ICs. Substituting the ADM238LJRZ-REEL in such contexts may necessitate additional external TVS diodes for compliance.
Can the ADM238LJRZ-REEL interface directly with TTL-level UARTs without additional voltage translation?
Yes, the ADM238LJRZ-REEL’s logic-side inputs accept standard TTL/CMOS levels from 0V to 5.25V, making it fully compatible with microcontrollers like ARM Cortex-M series or legacy 8051 devices. The TX side outputs CMOS-compatible 0–5V signals, while the RX side interprets RS232-compliant ±3V to ±15V as logic high/low. Therefore, no external translators are needed between the MCU UART and the ADM238LJRZ-REEL. Just ensure the host MCU operates at ≥4.75V to meet the transceiver’s minimum logic supply requirement.
What happens if the ADM238LJRZ-REEL’s supply voltage fluctuates between 4.5V and 5.25V during transient events?
Voltage excursions below 4.75V violate the absolute maximum rating and risk latch-up or permanent damage to the IC. Transient dips to 4.5V may cause erratic logic behavior, loss of transmitted data, or failure to initialize. To mitigate this, use a low-dropout linear regulator with good PSRR or add bulk capacitance (≥10 µF tantalum + 0.1 µF ceramic) close to the VCC pin. If brown-out conditions are anticipated, monitor the supply via an ADC or supervisor circuit and reset the system before recovery.
Is the ADM238LJRZ-REEL RoHS3 compliant and safe for use in European Union markets under REACH regulations?
Yes, the ADM238LJRZ-REEL is RoHS3 compliant and listed as REACH unaffected, meaning it contains no restricted substances beyond legal thresholds and poses minimal risk of chemical contamination. Its HTSUS code (8542.39.0001) confirms U.S. export classification, while ECCN EAR99 indicates no ITAR restrictions apply. These attributes make it suitable for global distribution without additional documentation or licensing, provided end-assemblies meet local safety standards.
How should the ADM238LJRZ-REEL be stored prior to tape-and-reel assembly to maintain long-term reliability?
Being MSL 1, the ADM238LJRZ-REEL requires no special storage beyond standard ESD-safe conditions: dry environment (<60% RH), room temperature (15°C–30°C), and protected from particulates. Store in original moisture-barrier bag with desiccant until use. Once opened, assembly must occur within 168 hours if humidity exceeds 60%, though this limit is generous due to the part’s inherent stability. Label bags clearly with date codes and rotation schedules to avoid obsolescence issues in long production runs.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc. ADM238LJRZ-REEL

Product Attribute ADM239LJRZ-REEL ADM238LJR-REEL ADM238LARZ-REEL ADM238LAR-REEL
Part Number ADM239LJRZ-REEL ADM238LJR-REEL ADM238LARZ-REEL ADM238LAR-REEL
Manufacturer Analog Devices Inc. Analog Devices Inc. Analog Devices Inc. Analog Devices Inc.
Duplex - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Mounting Type - Surface Mount Through Hole Surface Mount
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Data Rate - - - -
Number of Drivers/Receivers - - - -
Protocol - - - -
Voltage - Supply - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Type - - - -
Series - - - -
Receiver Hysteresis - - - -

ADM238LJRZ-REEL Datasheet PDF

Download ADM238LJRZ-REEL pdf datasheets and Analog Devices Inc. documentation for ADM238LJRZ-REEL - Analog Devices Inc..

Datasheets
Cylindrical Battery Holders.pdf
PCN Assembly/Origin
2.73KHz.pdf
Other Related Documents
Tape and Reel Packaging.pdf

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ADM238LJRZ-REEL Image

ADM238LJRZ-REEL

Analog Devices Inc.
32D-ADM238LJRZ-REEL

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