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ISO7221BDRG4

TI ISO7221BDRG4 Digital Isolator, 5 Mbps, 2500Vrms, 8-SOIC

MPNISO7221BDRG4
End of Life

Texas Instruments ISO7221BDRG4, General Purpose digital isolator, Capacitive Coupling, 2 Channel, Unidirectional, 5Mbps, 2500Vrms, 8-SOIC (0.154", 3.90mm Width), -40°C~125°C.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

ISO7221BDRG4 specifications
ParameterValue
TypeGeneral Purpose
Channel typeUnidirectional
MountingSurface Mount
Voltage3V ~ 5.5V
Voltage - isolation2500Vrms
Isolated powerNo
Operating temperature-40°C~125°C
Pulse width distortion3ns
PackageTape & Reel (TR)
Data rate5Mbps
TechnologyCapacitive Coupling
Case8-SOIC (0.154\", 3.90mm Width)
Channels2
Inputs - side 1/Side 21/1
Rise (Fall time)1ns, 1ns
Propagation delay tpLH (tpHL)70ns, 70ns
Common mode transient immunity25kV/µs

Product details

5 Mbps, 2500Vrms — what this dual-channel isolator brings to the BOM

It is designed to break ground loops and provide galvanic isolation in industrial fieldbus, motor-drive encoder feedback, and isolated SPI/UART links. The part delivers 5 Mbps signaling with 2500Vrms isolation and a common-mode transient immunity of 25kV/µs, which keeps data intact across noisy power-stage boundaries.

Wide supply range and industrial temperature grade

The supply range spans 3V to 5.5V, so the same part works on a 3.3V MCU side and a 5V sensor or gate-drive side without a level translator.

Timing margins and pulse-width distortion

Propagation delay is 70 ns max in both directions, and pulse-width distortion is held to 3 ns max. For a 5 Mbps signal (200 ns period), the 70 ns delay is about a third of the bit period — budget that in your timing closure. The 1 ns typical rise/fall time keeps edge rates fast enough for 5 Mbps but not so aggressive that they cause excessive EMI on a 2-layer board.

Frequently asked questions

Does ISO7221BDRG4 support 5V operation?

Yes, the supply range is 3V to 5.5V, so it operates directly on a 5V rail without a separate regulator.

What is the closest pin-compatible alternative to ISO7221BDRG4?

Within the same base family, the ISO7221 (non-B speed grade) is pin-compatible but rated for lower data rate. The 'B' suffix indicates the 5 Mbps speed grade. For a drop-in replacement with the same speed, the ISO7221BDRG4 is the target; the ISO7221B (different package suffix) may also be compatible — verify the 8-SOIC footprint and supply range before substituting.

What is ISO7221BDRG4's listed type?

The device type is General Purpose digital isolator.