Skip to main content
ISO7221CDG4

ISO7221CDG4 General Purpose Digital Isolator, 25 Mbps

MPNISO7221CDG4
End of Life

Texas Instruments ISO7221CDG4, General Purpose digital isolator, capacitive coupling, 2-channel unidirectional, 25 Mbps data rate, 2500 Vrms isolation, 2.8 V to 5.5 V supply, -40 to 125 °C, 8-SOIC package, Tube.

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

Specifications

ISO7221CDG4 specifications
ParameterValue
TypeGeneral Purpose
Channel typeUnidirectional
MountingSurface Mount
Voltage2.8V ~ 5.5V
Voltage - isolation2500Vrms
Isolated powerNo
Operating temperature-40°C~125°C
Pulse width distortion2ns
PackageTube
Data rate25Mbps
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)42ns, 42ns
Common mode transient immunity25kV/µs

Product details

It provides galvanic isolation up to 2500 Vrms between input and output sides, with one channel on side 1 and one on side 2.

25 Mbps data rate and 42 ns propagation delay — timing budget fit

The 25 Mbps data rate and 42 ns max propagation delay (both directions) set the timing budget for isolated SPI, UART, or general-purpose digital lines. With 2 ns max pulse-width distortion, the part preserves signal duty cycle across the isolation barrier — relevant for PWM or clock signals where mark-space ratio matters. The 1 ns typical rise/fall edges are fast enough for 25 Mbps but not so aggressive that they cause excessive EMI on a well-laid-out board. Common-mode transient immunity of 25 kV/µs min means the output stays clean during fast voltage swings between grounds, a common concern in motor-drive or power-converter environments.

Package and rework — 8-SOIC, no surprises

No hidden thermal pad, no fine-pitch alignment — just eight pins with a clear pin-1 mark. It reflows cleanly with a standard lead-free profile and is easy to inspect and touch up under a microscope. The tube shipping medium keeps the parts aligned and protected during handling; no bake-out needed unless the moisture-sensitive floor life has been exceeded (MSL level per the datasheet, not stated here).

The wide range also covers motor-drive junction temperatures near the heatsink and medical equipment that sees sterilization cycles.

Frequently asked questions

Is ISO7221CDG4 isolated?

Yes, the ISO7221CDG4 provides galvanic isolation using capacitive coupling, rated for 2500 Vrms between input and output sides. It has two unidirectional channels with one channel on each side of the isolation barrier.

What is the maximum data rate of ISO7221CDG4?

The maximum data rate is 25 Mbps, with a typical propagation delay of 42 ns max in both directions and pulse-width distortion of 2 ns max.

What is the difference between ISO7221 and ISO7220?

The ISO7221 has one channel on side 1 and one on side 2 (1/1 configuration), while the ISO7220 has both channels on side 1 (2/0). The ISO7221 is therefore suited for bidirectional isolation — e.g., one data line and one control line crossing the barrier in opposite directions.

What is the substitute for ISO7221CDG4?

Within the same family, the ISO7221C is the base number; the 'DG4' suffix indicates the lead-free, RoHS-compliant version in an 8-SOIC package. A pin-compatible alternative with the same function is the ISO7221M (higher data rate, 150 Mbps) if the application needs more speed, but the ISO7221CDG4 itself is the standard-speed option at 25 Mbps.