Part A
ADM232AARN
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4204 PCS
- Package
- SOIC-16
- Series
- Interface - Condutores, Receptores, Transceivers
Replacement verdict
Compatible functional replacement candidate
The ADM232LAR-REEL is a functionally compatible replacement candidate for the ADM232AARN, sharing the same dual RS-232 driver/receiver architecture, SOIC-16 footprint, and 5 V supply rail, with the L variant offering a lower slew rate for reduced EMI. Designers should validate the reduced slew rate against their data-rate requirements and confirm the exact reel packaging and temperature grade before committing to production.
Function and Channel Count
High match
Package and Pinout
High match
Slew Rate and Data Rate
Validation required
Temperature Grade and Packaging
Validation required
Parts at a glance
Part B
ADM232LAR-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8511 PCS
- Package
- SOIC-16
- Series
- Interface - Condutores, Receptores, Transceivers
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-REEL | Why it matters |
|---|---|---|---|
| Data Rate | 200 kbps | 120 kbps | Maximum guaranteed data rate affects the fastest reliable communication speed the interface can support. |
| Supply Voltage (Vcc) | 5 V | 3.0 V to 5.5 V | Operating voltage range determines compatibility with 3.3 V or 5 V logic systems and power rails. |
| Number of Drivers/Receivers | 2 / 2 | 2 / 2 | Driver and receiver count defines how many RS-232 channels are available for the interface. |
| External Capacitors Required | 4 x 1 µF | 4 x 0.1 µF | Charge pump capacitor values affect board space, BOM cost, and layout requirements for the RS-232 interface. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range confirms suitability for industrial versus commercial environments. |
| Package / Mounting | 16-Lead SOIC (Narrow), Surface Mount | 16-Lead SOIC (Narrow), Surface Mount, Tape & Reel | Package and packaging format affect footprint compatibility and assembly/pick-and-place handling. |
| Receiver Input Threshold | 1.3 V typical | 1.3 V typical | Input threshold determines noise immunity and logic-level recognition on the RS-232 receive path. |
| Shutdown / Low-Power Mode | No | No | Presence of a shutdown mode affects standby power consumption in battery or low-power designs. |
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-REEL |
|---|---|---|
| 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-REEL?
Both are dual RS-232 line drivers/receivers in a 16-lead narrow SOIC package, but they differ in operating temperature range and packaging format. The ADM232AARN is specified over the industrial temperature range of −40°C to +85°C and is supplied in tube form, while the ADM232LAR-REEL is specified over the commercial temperature range of 0°C to +70°C and is supplied on tape and reel for automated assembly.
Are the ADM232AARN and ADM232LAR-REEL functionally interchangeable?
Functionally, both devices provide two RS-232 drivers and two RS-232 receivers with an on-chip charge pump, and both operate from a single +5 V supply. However, they are not drop-in equivalents for all applications because the ADM232AARN is rated for the industrial temperature range while the ADM232LAR-REEL is rated only for the commercial range. Substitution is acceptable only where the operating temperature range and packaging format meet the design requirements.
What supply voltage do the ADM232AARN and ADM232LAR-REEL require?
Both devices operate from a single +5 V supply and use an internal charge pump to generate the positive and negative RS-232 voltage levels required for compliant RS-232 output swings.
How many drivers and receivers do these devices integrate?
Each device integrates two RS-232 drivers and two RS-232 receivers, making them suitable for dual-channel serial interface applications such as computer I/O ports and modem interfaces.
What package do the ADM232AARN and ADM232LAR-REEL use?
Both parts are offered in a 16-lead narrow-body SOIC package, which allows compact board layout and is compatible with standard SOIC-16 PCB land patterns.
What is the difference in temperature rating between the two parts?
The ADM232AARN is rated for the industrial temperature range of −40°C to +85°C, whereas the ADM232LAR-REEL is rated for the commercial temperature range of 0°C to +70°C. Designs exposed to sub-zero or elevated ambient temperatures should use the industrial-rated ADM232AARN.
Why is the ADM232LAR-REEL supplied on tape and reel?
The ADM232LAR-REEL is packaged in tape-and-reel format to support high-volume automated pick-and-place assembly lines, whereas the ADM232AARN is supplied in tube form, which is typically used for lower-volume or prototype production.
Do these devices require external charge-pump capacitors?
Yes. Both the ADM232AARN and ADM232LAR-REEL require external capacitors for the internal charge pump to generate the RS-232 voltage levels. The capacitor values and configuration should be taken from the respective manufacturer datasheet to ensure compliant RS-232 output levels.