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Home Products Integrated Circuits (ICs)Interface - Drivers, Receivers, Transceivers~~ADM239LAN~~

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ADM239LAN - Analog Devices Inc.

Manufacturer Part Number: ADM239LAN

Manufacturer: Analog Devices, Inc.

Allelco Part Number: 98D-ADM239LAN

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 4,289 pcs available, New & Original

Parts Description: IC TXRX RS-232 5:3 5V LP 24DIP

Package: 24-PDIP

Data sheet: ADM239LAN.pdf

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

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In stock: 4289

Unit Price: $8.991
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Quantity	Unit Price	Ext. Price
1+	$8.991	$8.99
200+	$3.479	$695.80
500+	$3.357	$1,678.50
1000+	$3.297	$3,297.00

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

Specifications

ADM239LAN Tech Specifications
Analog Devices Inc. - ADM239LAN technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. - ADM239LAN

Product Attribute	Attribute Value
Manufacturer	Analog Devices, Inc.
Voltage - Supply	4.75V ~ 5.25V
Type	Transceiver
Supplier Device Package	24-PDIP
Series	-
Protocol	RS232

Product Attribute	Attribute Value
Package / Case	24-DIP (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)

How does the ADM239LAN compare to other RS-232 transceivers in terms of supply voltage range and data rate, and what are the implications for system power design?: The ADM239LAN supports a supply voltage range of 5V to 7.5V–13.2V, which allows flexible integration into systems using either single or dual power rails. This wide range is particularly beneficial when interfacing with mixed-voltage environments, such as legacy industrial equipment powered by ±12V supplies alongside modern 5V digital logic. In comparison to standard 5V-only transceivers like the MAX232, the ADM239LAN offers broader compatibility without requiring external level-shifting circuitry. Its data rate of 120Kbps falls within the typical range for RS-232 communication, suitable for serial interfaces in control systems, instrumentation, and embedded applications where moderate speed and long cable runs are expected. However, this rate may limit performance in high-throughput scenarios compared to newer UART-based solutions.

What are the key differences between the ADM239LAN and similar transceiver ICs from Texas Instruments, especially regarding charge pump implementation and receiver hysteresis?: Unlike some TI devices that rely on external capacitors for their internal charge pumps, the ADM239LAN includes an integrated charge pump capable of generating the negative voltage rail required for RS-232 signal transmission from a single positive supply. This simplifies PCB layout and reduces component count compared to designs using discrete charge-pump circuits. Additionally, the ADM239LAN features robust receiver inputs with built-in hysteresis, which helps reject noise on long or noisy communication lines—critical in industrial settings. While many TI equivalents offer similar receiver counts, the ADM239LAN’s combination of five receivers and three drivers makes it well-suited for multi-drop configurations common in PROFIBUS or MODBUS networks. The absence of external components enhances reliability but requires careful attention to decoupling near the IC.

Can the ADM239LAN operate reliably in automotive environments, given its specified operating temperature range and package type?: No, the ADM239LAN is rated for industrial temperatures from -40°C to +85°C, which exceeds standard commercial grades but does not meet automotive-grade requirements (typically -40°C to +125°C). Therefore, it is not qualified for use in automotive applications where prolonged exposure to elevated temperatures or thermal cycling is expected. Its PDIP-24 plastic package also lacks the hermetic sealing or enhanced moisture resistance found in ceramic alternatives used in high-reliability systems. For automotive RS-232 interfaces, designers should consider alternative parts specifically tested under AEC-Q100 standards, even if they share similar electrical characteristics.

When selecting between the ADM2324E and ADM239LAN for a new design, how do driver/receiver counts and data rates influence architecture decisions?: The ADM239LAN provides five receivers and three drivers, making it ideal for complex multi-device communication topologies such as PROFIBUS DP networks, where one master communicates with multiple slaves. In contrast, the ADM2324E typically offers fewer channels (e.g., 3/3 or 5/3 depending on variant) and lower maximum data rates around 1Mbps. While both support full-duplex RS-232 signaling, the ADM239LAN’s 120Kbps limit is sufficient for most fieldbus protocols but insufficient for high-speed serial links like CAN-to-RS-232 bridges handling >500kbps traffic. Designers must balance channel count against throughput needs: choose ADM239LAN for cost-sensitive, low-speed industrial networks; opt for faster, higher-channel-count variants if scalability and bandwidth become critical.

Is it possible to daisy-chain multiple devices using the ADM239LAN, and what limitations exist due to its data rate and driver characteristics?: Yes, daisy-chaining is feasible with the ADM239LAN, provided total cable capacitance remains below the 2500pF maximum supported by each driver. At 120Kbps, propagation delays over long cables can accumulate, potentially causing timing issues in synchronous applications. Each additional node adds load capacitance and signal attenuation, reducing margin at the receiver input threshold. To maintain integrity, keep total stub lengths short (<10cm per connection) and use shielded twisted-pair cabling. Also note that enabling all five receivers simultaneously increases standby power draw slightly due to input bias currents, though this remains minimal (<1µA per input). Proper termination and impedance matching are essential to prevent reflections, especially in multi-drop setups exceeding three nodes.

What considerations apply when using the ADM239LAN in battery-powered systems with strict power budgets?: Although the ADM239LAN operates from 5V to 13.2V, its quiescent current is relatively low—approximately 8mA at 5V supply—making it viable for moderate-duty battery applications such as data loggers or remote sensors. However, continuous operation at full data rates consumes more energy than sleep-mode alternatives like LIN or I²C. If duty-cycling is used, ensure wake-up times align with driver enable/disable latencies (~microseconds). Avoid running at upper end of supply range (>10V) unless necessary, as higher voltages increase power dissipation during transmit cycles. Always include bulk and bypass capacitors close to VCC and GND pins to stabilize the internal charge pump, which draws transient current spikes during switching events.

How does the ADM239LAN handle electrostatic discharge (ESD) protection compared to newer CMOS-based UART transceivers?: The ADM239LAN incorporates internal ESD protection diodes at each RS-232 input/output pin, rated to ±15kV air discharge and ±8kV contact discharge according to IEC 61000-4-2. This surpasses basic CMOS devices lacking dedicated protection but falls short of automotive-grade protections seen in parts designed for ISO 10605 compliance. In industrial environments with frequent cable disconnections or inductive loads, external TVS diodes may still be advisable. Unlike modern UART-to-RS-232 bridges using advanced process nodes, the ADM239LAN relies on older Bipolar-CMOS technology, which inherently offers better latch-up immunity but higher power consumption. Thus, while adequate for most non-automotive uses, additional hardening might be warranted in harsh EMI-rich installations.

Are there any known limitations when driving capacitive loads beyond the specified 2500pF with the ADM239LAN?: Exceeding the 2500pF capacitive load limit per output significantly degrades rise/fall times and increases susceptibility to ringing or oscillation, especially at higher data rates approaching 120Kbps. While the device can sometimes tolerate modest overloads (e.g., 3000–3500pF) in benign conditions, reliable operation cannot be guaranteed across temperature extremes or production lots. Long unshielded cables or poorly matched terminations easily push total capacitance past this threshold. If longer traces are unavoidable, consider adding series resistors (22–100Ω) at outputs to dampen reflections and reduce effective load seen by the driver. Alternatively, buffer stages or line drivers with higher drive capability could isolate the ADM239LAN from heavy loads.

Does the ADM239LAN support hot-swapping, and what precautions should be taken during insertion or removal of serial peripherals?: Hot-swapping is not officially supported due to the lack of robust protection against inrush current or voltage transients during live connection/disconnection. Connecting RS-232 lines while powered can cause latch-up or damage if ESD events coincide with power surges. To mitigate risks, always disconnect power before plugging/unplugging cables, or implement external current-limiting resistors (≥100Ω) in series with TX/RX lines. For partially powered systems, use MOSFET-based isolation switches controlled by a supervisor circuit to disconnect RS-232 paths until stable voltages settle. Note that even with these measures, the internal charge pump may struggle with rapid load changes, leading to temporary signal distortion during hot-plug events.

What role does the internal charge pump play in the ADM239LAN, and why is it important for single-supply operation?: The integrated charge pump generates a negative voltage (down to approximately -7V) from the positive supply rail, enabling true RS-232 signal levels (±3V to ±15V) without needing a separate negative supply. This eliminates the need for external DC-DC converters or batteries, simplifying system architecture in single-ended power environments. Without the charge pump, achieving compliant RS-232 outputs would require dual rails or complex bootstrap circuits, increasing board size and cost. The pump operates continuously in normal mode, contributing to steady-state power consumption. However, it also ensures consistent output swing regardless of input logic transitions, preserving protocol compatibility across diverse receivers.

How should the ADM239LAN be decoupled electrically, and what impact does poor decoupling have on performance?: Each VCC pin must be connected to a 0.1µF ceramic capacitor placed within 5mm to minimize ground bounce and stabilize the internal charge pump. A larger bulk capacitor (e.g., 10µF tantalum or ceramic) should also be present near the power entry point. Insufficient decoupling causes erratic driver behavior, increased jitter, and potential failure to meet RS-232 voltage thresholds. During transmit bursts, the charge pump draws peak currents up to 50mA, which must be supplied locally to avoid supply droop affecting other ICs. Poor grounding or shared return paths exacerbate noise coupling into sensitive receiver inputs, especially in noisy industrial settings.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc. ADM239LAN

Product Attribute
Part Number	ADM239LANZ	ADM239LARZ	ADM239LAR	ADM239LAQ
Manufacturer	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Number of Drivers/Receivers	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Type	-	-	-	-
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Protocol	-	-	-	-
Series	-	-	-	-
Voltage - Supply	-	-	-	-
Base Product Number	-	DAC34H84	MAX500	ADS62P42

ADM239LAN Datasheet PDF

Download ADM239LAN pdf datasheets and Analog Devices Inc. documentation for ADM239LAN - Analog Devices Inc..

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

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The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.
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Liam***terTech

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Nath***rooks

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Dani***alkerTech

Jun 1, 2026

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Yuki***aka88

May 26, 2026

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Stev***aker

May 20, 2026

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

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America	United States	5
America	Brazil	7
Europe	Germany	5
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Oceania	Australia	6
Oceania	New Zealand	5
Asia	India	4
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Middle East	Israel	6

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1.00kg-2.00kg	USD$40.00 - USD$80.00
2.00kg-3.00kg	USD$50.00 - USD$100.00

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ADM239LAN

Analog Devices Inc.
98D-ADM239LAN

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