Texas Instruments ISO7221CDR, General Purpose digital isolator, capacitive coupling, 2 unidirectional channels, 25Mbps data rate, 2500Vrms isolation, 8-SOIC package, -40°C to 125°C.
| Parameter / Attribute | Specification / Value |
|---|---|
| Type | General Purpose |
| Channel type | Unidirectional |
| Mounting | Surface Mount |
| Supply voltage | 2.8V ~ 5.5V |
| Voltage - isolation | 2500Vrms |
| Isolated power | No |
| Operating temperature | -40°C ~ 125°C |
| Pulse width distortion | 2ns |
| Package | Tape & Reel (TR) Cut Tape (CT) |
| Data rate | 25Mbps |
| Technology | Capacitive Coupling |
| Case | 8-SOIC (0.154\", 3.90mm Width) |
| Channels | 2 |
| Inputs - side 1/Side 2 | 1/1 |
| Rise (Fall time) | 1ns, 1ns |
| Propagation delay tpLH (tpHL) | 42ns, 42ns |
| Common mode transient immunity | 25kV/µs |
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It passes signals across a 2500Vrms isolation barrier at data rates up to 25Mbps with typical rise/fall times of 1ns.
That figure matters in motor-drive environments where PWM switching couples fast voltage edges across the barrier — below that threshold, the output can glitch. The 25kV/µs rating is typical for this class and sufficient for most industrial drives; if you are working in a high-noise traction inverter or solar inverter, the ISO7721FBDWR offers 85kV/µs CMTI and 5kVrms isolation.
The maximum data rate is 25Mbps. That supports SPI at 20 MHz, UART up to 3 Mbps, and general-purpose I/O toggling without timing issues.
No — the ISO7221CDR does not include isolated power. Each side requires its own local supply (2.8V to 5.5V), and the isolation barrier only passes data, not power.
Yes — the supply range of 2.8V to 5.5V covers both 3.3V and 5V logic. The inputs and outputs swing rail-to-rail, so no external level translation is needed when both sides use the same supply voltage.