Texas Instruments ISO7721FBDWR, 2-channel digital isolator, capacitive coupling, 100Mbps data rate, 5000Vrms isolation, 2.25V to 5.5V supply, -55°C to 125°C, 16-SOIC package.
| Parameter | Value |
|---|---|
| Type | CAN, RS232, RS485 |
| Channel type | Unidirectional |
| Mounting | Surface Mount |
| Voltage | 2.25V ~ 5.5V |
| Voltage - isolation | 5000Vrms |
| Isolated power | No |
| Operating temperature | -55°C ~ 125°C |
| Pulse width distortion | 4.9ns |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Data rate | 100Mbps |
| Technology | Capacitive Coupling |
| Case | 16-SOIC (0.295\", 7.50mm Width) |
| Channels | 2 |
| Inputs - side 1/Side 2 | 1/1 |
| Rise (Fall time) | 1.8ns, 1.9ns |
| Propagation delay tpLH (tpHL) | 16ns, 16ns |
| Common mode transient immunity | 85kV/µs |
It is rated for CAN, RS-232, and RS-485 bus protocols.
The 85 kV/µs common-mode transient immunity keeps data intact when large voltage transients slam across the barrier.
The wide-body SOIC gives the creepage distance needed to maintain the 5000 Vrms rating across the PCB — a narrower package would derate the isolation voltage. No isolated power on the secondary side; the part is a pure signal isolator, so each side needs its own supply rail.
The maximum data rate is 100 Mbps, sufficient for CAN FD, high-speed RS-485, and fast SPI links.
Yes, the part is explicitly rated for CAN, RS-232, and RS-485 protocols, with 100 Mbps data rate covering CAN FD and 5000 Vrms isolation meeting the galvanic separation requirements for industrial CAN networks.
Yes, the 2.25 V to 5.5 V supply range includes 3.3 V, so it interfaces directly with 3.3 V logic on either side without a level shifter.