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HomeProductsIntegrated Circuits (ICs)Interface - Drivers, Receivers, TransceiversADM239LAQ
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ADM239LAQ - Analog Devices Inc.

Manufacturer Part Number
ADM239LAQ
Manufacturer
Analog Devices, Inc.
Allelco Part Number
98D-ADM239LAQ
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
38,257 pcs available, New & Original
Parts Description
IC TXRX RS-232 3:5 5V LP 24CDIP
Package
24-CDIP
Data sheet
ADM239LAQ.pdf
RoHs Status
 
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Our certification
In stock: 38257
  • Unit Price: $2.94
  • Subtotal: $0.00

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1+ $2.94 $2.94
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

ADM239LAQ Tech Specifications
Analog Devices Inc. - ADM239LAQ technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. - ADM239LAQ

Product Attribute Attribute Value
Manufacturer Analog Devices, Inc.
Voltage - Supply 4.75V ~ 5.25V
Type Transceiver
Supplier Device Package 24-CDIP
Series -
Protocol RS232
Product Attribute Attribute Value
Package / Case 24-CDIP (0.300", 7.62mm)
Package Tube
Number of Drivers/Receivers 3/5
Mounting Type Through Hole
Base Product Number ADM239L

Environmental & Export Classifications

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

Frequently Asked Questions(FAQ)

What are the key performance limitations of the ADM239LAQ transceiver when interfacing with legacy RS-232 peripherals in industrial environments?
The ADM239LAQ operates at a maximum data rate of 120 Kbps, which may limit its suitability for high-speed RS-232 applications such as fast serial communication with modern microcontrollers or high-throughput sensor networks. While sufficient for many industrial control loops and telemetry systems, users should verify signal integrity under long cable runs or noisy conditions, as capacitive loading and voltage swing constraints typical of RS-232 can degrade performance beyond this threshold. Additionally, the device’s charge pump enables operation from a single 5 V supply, but output swing compliance must be evaluated against receiver input thresholds to ensure reliable logic-level translation.
How does the ADM239LAQ compare to the ADM249LAQ in terms of driver and receiver configuration for multi-node serial bus designs?
The ADM239LAQ features three drivers and five receivers, providing greater flexibility in point-to-multipoint configurations compared to the ADM249LAQ, which typically offers two drivers and four receivers. This asymmetric design allows the ADM239LAQ to drive more RS-232 transceivers while still accepting signals from multiple remote nodes—useful in distributed monitoring systems. However, both devices share similar 120 Kbps data rates and 5 V supply requirements, so system designers must consider pin compatibility and thermal dissipation in CDIP-24 packaging when substituting parts.
Can the ADM239LAQ reliably operate in automotive environments where temperature cycling is common?
The ADM239LAQ is rated for an operating temperature range of -40°C to +85°C, making it suitable for industrial and some extended-temperature applications. While this covers most non-automotive environments, automotive qualification typically requires broader temperature ranges (e.g., -40°C to +125°C) and stricter reliability testing such as AEC-Q100 certification. Users planning deployment in automotive systems should confirm that the ADM239LAQ meets these additional standards or select a qualified variant, as solder joint fatigue or parametric drift outside specified limits could compromise performance during thermal stress cycles.
What design considerations are critical when using the ADM239LAQ in a system powered by a noisy 5 V rail?
Due to its reliance on an integrated charge pump for RS-232 level generation, the ADM239LAQ is sensitive to supply noise and ripple on the 5 V line. Excessive noise can affect the stability of the internal voltage doubler and inverters, potentially leading to reduced output swing or increased propagation delay. Designers should include low-dropout regulators (LDOs) or well-filtered decoupling capacitors near the ADM239LAQ’s power pins. Additionally, layout practices such as minimizing loop area on charge-pump traces and avoiding proximity to switching regulators are essential to maintain signal fidelity and prevent ground bounce.
Is the ADM239LAQ suitable for replacing discrete MAX232-based designs in space-constrained applications?
Yes, the ADM239LAQ integrates the charge pump circuitry required for RS-232 signaling, eliminating the need for external capacitors used in MAX232 implementations. This reduces board real estate and simplifies BOM complexity. With a data rate up to 120 Kbps and support for three drivers and five receivers, it offers comparable functionality while maintaining RoHS compliance. However, unlike the MAX232, the ADM239LAQ uses a CDIP-24 package—a hermetic dual-in-line plastic package—which may not fit standard DIP footprints without mechanical adaptation, limiting drop-in replacement unless footprint redesign is feasible.
What happens to the ADM239LAQ’s output levels if the supply voltage drops below 4.5 V?
The ADM239LAQ specifies proper operation down to 4.75 V under typical load conditions. If the supply dips below this threshold, especially under capacitive loading common in RS-232 lines, the charge pump may fail to generate sufficient ±10 V swings, resulting in degraded logic margins at the receiver end. This can lead to misinterpretation of high or low states, increasing error rates. System designs should include brown-out detection or voltage supervision to disable UART communication before the ADM239LAQ enters undefined behavior.
How does the number of supported drivers and receivers in the ADM239LAQ influence topology choices in fieldbus installations?
With three drivers and five receivers, the ADM239LAQ supports complex multidrop topologies where a central controller communicates bidirectionally with multiple remote devices. Each driver can interface with one RS-232 port, enabling simultaneous transmission paths, while the five receivers allow reception from several endpoints. This is advantageous in telemetry gateways or programmable logic controller (PLC) networks. However, RS-232 lacks native multidrop addressing, so protocol-level arbitration (e.g., Modbus RTU) must be implemented externally to avoid contention.
Are there any known compatibility issues between the ADM239LAQ and modern CMOS microcontroller UARTs?
The ADM239LAQ outputs standard RS-232 voltage levels (±5 V to ±12 V), which exceed the absolute maximum ratings of most 3.3 V or 5 V CMOS microcontrollers. Direct connection without level shifting risks damaging the MCU. Instead, the ADM239LAQ should drive only dedicated RS-232 transceivers or opto-isolated interfaces. Some newer MCUs support 5 V-tolerant I/O, but even then, input protection diodes may clamp negative voltages if the RS-232 line floats. Therefore, isolated or buffered connections are recommended for robust coexistence.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc. ADM239LAQ

Product Attribute ADM239LANZ ADM239LAR ADM239LARZ ADM239LAN
Part Number ADM239LANZ ADM239LAR ADM239LARZ ADM239LAN
Manufacturer Analog Devices Inc. Analog Devices Inc. Analog Devices Inc. Analog Devices Inc.
Type - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Protocol - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Mounting Type - Surface Mount Through Hole Surface Mount
Series - - - -
Voltage - Supply - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Number of Drivers/Receivers - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)

ADM239LAQ Datasheet PDF

Download ADM239LAQ pdf datasheets and Analog Devices Inc. documentation for ADM239LAQ - Analog Devices Inc..

Datasheets
ADM231L-234L, ADM236L-241L.pdf

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0.00kg-1.00kg USD$30.00 - USD$60.00
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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.
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ADM239LAQ Image

ADM239LAQ

Analog Devices Inc.
98D-ADM239LAQ

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

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