Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Isolation | 2.5 kV power and data isolation |
| Data rate | Up to 460 kbps |
| Channels | 1 transmitter / 1 receiver |
| Supply | Single 5 V supply |
| ESD on RIN/TOUT | ±8 kV contact, ±15 kV air-gap |
| CMTI | >25 kV/µs |
| Charge-pump capacitors | 0.1 µF external capacitors |
| Package | 20-lead SOIC_W, RW-20 |
| Operating temperature | −40°C to +85°C |
Product Overview
ADM3251EARWZ-REEL integrates a single RS-232 transmit/receive channel, digital isolation, and isolated power conversion. A single 5 V input supplies the logic side while the internal isolation-power stage creates the isolated domain required by the cable-side interface.
The device supports up to 460 kbps and conforms to EIA/TIA-232E. Its cable-side RIN and TOUT pins have high ESD protection, while the 2.5 kV isolation barrier separates the serial interface from local logic.
Key Features
- Fully isolated power and data path for one RS-232 Tx/Rx channel.
- Integrated isoPower converter from a single 5 V supply.
- 460 kbps maximum data rate.
- ±8 kV contact and ±15 kV air-gap ESD protection on RIN and TOUT.
Functional Highlights
This device consolidates the RS-232 transceiver, digital isolator, and isolation-power function, reducing the number of interfaces that must cross the isolation boundary.
The four 0.1 µF charge-pump capacitors remain functional components; value, voltage rating, placement, and loop impedance affect reliable RS-232 rail generation.
Application Fit
- High-noise data communications.
- Industrial communications and diagnostic ports.
- General-purpose isolated RS-232 data links.
Design Considerations
- Provide a clean 5 V supply and place the charge-pump capacitors close to the relevant pins.
- Account for isoPower switching emissions in PCB layout.
- Check the 460 kbps limit against cable length and serial timing.
- Use the exact RW-20 wide-body footprint and maintain required isolation spacing.
Product Status
Manufacturer status: PRODUCTION
Analog Devices currently lists ADM3251EARWZ-REEL as PRODUCTION.
Related Engineering Resources
Alternative Candidates for Engineering Evaluation
| MPN | Manufacturer | Package |
|---|---|---|
| ADM3251EARWZ | ADI | SOIC-20-300mil |
Candidate alternative parts require engineering verification before substitution. Electrical characteristics, pinout, package, qualification, and application requirements should be verified before use.
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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