Analog Devices Inc. ADM3251E RS-232 Line Driver/Receivers

Analog Devices Inc. ADM3251E RS-232 Line Driver/Receivers are high speed, 2.5kV fully isolated, single- channel RS-232/V.28 transceiver devices. The ADM3251E operates from a single 5V power supply and incorporates dual-channel digital isolators with isoPower™ integrated, isolated power. The device is ideally suited for operation in electrically harsh environments or where RS-232 cables are frequently being plugged and unplugged due to the high ESD protection on the RIN and TOUT pins.

The ADM3251E utilizes isoPower technology that uses high-frequency switching elements to transfer power through the transformer. The ADM3251E conforms to the EIA/TIA-232E and ITU-T V. 28 specifications. The device operates at data rates up to 460kbps, with four external 0.1μF charge pump capacitors used for the voltage doubler/inverter, permitting operation from a single 5V supply. The ADM3251E is available in a 20-lead, wide-body SOIC package and is specified over the −40°C to +85°C temperature range.


  • 2.5kV fully isolated (power and data) RS-232 transceiver
  • isoPower integrated, isolated dc-to-dc converter
  • 460kbps data rate
  • 1 Tx and 1 Rx
  • Meets EIA/TIA-232E specifications
  • ESD protection on RIN and TOUT pins
    • ±8kV: contact discharge
    • ±15kV: air gap discharge
  • 0.1μF charge pump capacitors
  • High common-mode transient immunity: >25kV/μs
  • Safety and regulatory approvals
    • UL recognition
    • 2500 Vrms for 1 minute per UL 1577
    • VDE Certificate of Conformity
    • DIN EN 60747-5-2 (VDE 0884 Teil 2): 2003-01
    • CSA Component Acceptance Notice #5A
  • Operating temperature range: −40°C to +85°C
  • Wide body, 20-lead SOIC package


  • High noise data communications
  • Industrial communications
  • General-purpose RS232 data links
  • Industrial/telecommunications diagnostic ports
  • Medical equipment


Block Diagram

Block Diagram - Analog Devices Inc. ADM3251E RS-232 Line Driver/Receivers
Published: 2019-05-08 | Updated: 2022-03-10