Part A
ADM232AARN
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4204 Stückzahl
- Package
- SOIC-16
- Series
- Interface-Treiber, Empfänger, Transceiver
Replacement verdict
Compatible functional replacement candidate
The ADM232LAR is a functionally compatible replacement candidate for the ADM232AARN, sharing the same dual RS-232 driver/receiver architecture, pinout, and package. Designers should validate the lower data rate and reduced external capacitor requirements against their specific application before substituting.
Function and Configuration
High match
Package and Pinout
High match
Data Rate
Validation required
External Capacitor Requirements
Validation required
Parts at a glance
Part B
ADM232LAR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6140 Stückzahl
- Package
- SOIC-16
- Series
- Interface-Treiber, Empfänger, Transceiver
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADM232AARN | ADM232LAR | Why it matters |
|---|---|---|---|
| Data Rate | 200 kbps | 120 kbps | Maximum guaranteed data rate affects throughput; the A version supports higher speeds than the L version. |
| Operating Supply Voltage | 5 V | 5 V | Both are 5 V RS-232 transceivers; supply compatibility is essential for direct substitution in a 5 V system. |
| Number of Drivers/Receivers | 2/2 | 2/2 | The driver/receiver count determines how many RS-232 channels are available; matching counts ensures pin and functional compatibility. |
| External Capacitors Required | 4 x 1 µF | 4 x 1 µF | Charge-pump capacitor count and value affect board layout and BOM; identical requirements simplify drop-in replacement. |
| Package / Mounting | 16-SOIC (surface mount) | 16-SOIC (surface mount) | Package and footprint must match for physical interchangeability on the PCB. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Industrial temperature range ensures reliable operation across environments; matching ranges support substitution. |
| Receiver Input Voltage Range | ±30 V | ±30 V | RS-232 receiver input tolerance protects against overvoltage; identical ratings ensure equivalent robustness. |
| Supply Current (Typical) | ~5 mA | ~5 mA | Quiescent current impacts power budget; similar values indicate comparable power consumption. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADM232AARN | ADM232LAR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
| Type | Transceiver | Transceiver |
| Protocol | RS232 | RS232 |
| Number of Drivers/Receivers | 2/2 | 2/2 |
| Duplex | Full | Full |
| Receiver Hysteresis | 400 mV | 650 mV |
| Data Rate | 200kbps | 120Kbps |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADM232AARN and ADM232LAR?
Both are dual RS-232 line drivers/receivers in a 16-lead narrow SOIC package (RN suffix). The primary difference is the data rate and slew rate specification: the ADM232AARN is specified for a maximum data rate of 200 kB/s, while the ADM232LAR is a low-slew-rate version specified for 120 kB/s. The ADM232LAR is intended for applications where reduced EMI is desired. Both operate from a single +5 V supply and require four external 0.1 µF charge pump capacitors.
Are the ADM232AARN and ADM232LAR pin-compatible?
Yes. Both devices are offered in the same 16-lead narrow SOIC (RN) package and share the same pinout, including the charge pump capacitor pins (C1+, C1−, C2+, C2−, V+, V−), the two RS-232 drivers, the two RS-232 receivers, and the TTL/CMOS logic interface pins. This allows the ADM232LAR to be used as a drop-in replacement for the ADM232AARN when the lower slew rate is acceptable.
What supply voltage do the ADM232AARN and ADM232LAR require?
Both devices operate from a single +5 V ±10% supply (4.5 V to 5.5 V). They generate the required RS-232 voltage levels internally using on-chip charge pump converters, so no additional ±12 V supplies are needed.
How many external capacitors are needed for the ADM232AARN and ADM232LAR?
Both devices require four external 0.1 µF capacitors for the internal charge pump: two for the voltage doubler (C1 and C2) and two for the voltage inverter (C3 and C4). These capacitors are connected to the C1+, C1−, C2+, C2−, V+, and V− pins as specified in the manufacturer datasheet.
What is the difference in slew rate between the ADM232AARN and ADM232LAR?
The ADM232AARN has a higher slew rate suitable for data rates up to 200 kB/s, while the ADM232LAR is a low-slew-rate variant limited to 120 kB/s. The reduced slew rate of the ADM232LAR lowers radiated EMI, making it preferable for noise-sensitive designs, whereas the ADM232AARN is chosen when higher throughput is required.
Can the ADM232LAR directly replace the ADM232AARN in an existing design?
In most cases yes, because both share the same 16-lead narrow SOIC package, pinout, +5 V supply requirement, and external capacitor configuration. However, the replacement should be validated against the target design because the ADM232LAR has a lower maximum data rate (120 kB/s vs. 200 kB/s) and different slew rate characteristics. If the system operates within 120 kB/s and the reduced slew rate is acceptable, the ADM232LAR can serve as a drop-in substitute.
What is the operating temperature range for the ADM232AARN and ADM232LAR?
Both devices are specified for the industrial temperature range of −40 °C to +85 °C, as indicated by the "A" grade suffix in their part numbers. This makes them suitable for industrial and embedded applications requiring extended temperature operation.