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Analog Devices ADUM1281WARZ — Digital Isolators

ADUM1281WARZ Digital Isolator, 2-Ch, 1Mbps, 3000Vrms, SOIC-8

MPNADUM1281WARZ
End of Life

Analog Devices ADUM1281WARZ, iCoupler® 2-channel unidirectional digital isolator, 1Mbps data rate, 3000Vrms isolation, 25kV/µs CMTI, 3V–5.5V supply, -40°C to 125°C, 8-SOIC package, tube.

$5.27Ref. price · indicative, final on quote
Analog Devices ADUM1281WARZ datasheet (PDF)
Packaging8-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

ADUM1281WARZ specifications
ParameterValue
TypeGeneral Purpose
Channel typeUnidirectional
MountingSurface Mount
Supply voltage3V ~ 5.5V
Voltage - isolation3000Vrms
Isolated powerNo
Operating temperature-40°C ~ 125°C
Pulse width distortion10ns
GradeAutomotive
PackageTube
Data rate1Mbps
TechnologyMagnetic Coupling
Case8-SOIC (0.154\", 3.90mm Width)
Channels2
Inputs - side 1/Side 21/1
Rise (Fall time)2.5ns, 2.5ns
Propagation delay tpLH (tpHL)50ns, 50ns
Common mode transient immunity25kV/µs

Product details

Two-channel unidirectional isolation for automotive signal chains

The ADUM1281WARZ: It provides 3000Vrms galvanic isolation between two independent supply domains, with one channel per side (one input on side 1, one input on side 2).

1Mbps data rate with 50ns propagation delay

Rise and fall times are symmetrical at 2.5ns typical. This timing budget suits isolated SPI, UART, and general-purpose GPIO isolation at moderate speeds — the 1Mbps ceiling is a comfortable fit for CAN transceiver isolation (typically 500kbps to 1Mbps) and for breaking ground loops in sensor readout lines without introducing excessive skew.

The part does not include an integrated isolated DC-DC converter (isolated power: No), so each side requires its own local supply rail — a clean 3.3V or 5V from the system regulator, with the usual 0.1µF decoupling caps placed close to the supply pins.

Frequently asked questions

Is ADUM1281WARZ a direct replacement for ADUM1201?

No. The ADUM1201WSRZ is a 1Mbps automotive-grade 2-channel isolator with a 2500Vrms isolation rating and a 150ns propagation delay, while the ADUM1281WARZ offers 3000Vrms isolation and a faster 50ns propagation delay. Pinout and channel configuration differ — the ADUM1201 has both inputs on side 1, whereas the ADUM1281 has one input on each side. They are not drop-in replacements.

Does ADUM1281WARZ require an external isolated power supply?

Yes. The part does not include an integrated isolated DC-DC converter, so each side of the isolation barrier needs its own local supply rail (3V to 5.5V).

Is ADUM1281WARZ compatible with 3.3V systems?

Yes, the supply voltage range extends down to 3V, so it works directly with 3.3V logic without level translation.

What is the difference between ADUM1281WARZ and ADUM1281BRZ?

Both share the same 1Mbps data rate, 3000Vrms isolation, and 8-SOIC package.