Texas Instruments ISO1642DWR, ISO164x series, I²C/SPI capacitive-coupling isolator, 4 channels, 50 Mbps data rate, 5000 Vrms isolation, 3V to 5.5V supply, -40°C to 125°C, 16-SOIC package.
| Parameter | Value |
|---|---|
| Type | I²C, SPI |
| Series | ISO164x |
| Channel type | Bidirectional, Unidirectional |
| Mounting | Surface Mount |
| Voltage | 3V ~ 5.5V |
| Voltage - isolation | 5000Vrms |
| Isolated power | No |
| Operating temperature | -40°C ~ 125°C |
| Pulse width distortion | 45ns |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Data rate | 50Mbps |
| Technology | Capacitive Coupling |
| Case | 16-SOIC (0.295\", 7.50mm Width) |
| Channels | 4 |
| Inputs - side 1/Side 2 | 3/3 |
| Rise (Fall time) | 24ns, 16ns |
| Propagation delay tpLH (tpHL) | 70ns, 88ns |
| Common mode transient immunity | 50kV/µs |
Propagation delay is 70 ns (low to high) and 88 ns (high to low), with a maximum pulse-width distortion of 45 ns. Rise and fall times are 24 ns and 16 ns typical.
Housed in a 16-pin SOIC wide-body (7.50 mm width), surface-mount. The wide-body gives you the creepage distance needed to maintain the 5000 Vrms rating across the isolation barrier — don't substitute a narrow SOIC footprint.
The ISO1642DWR has 4 channels (3 inputs on side 1, 3 on side 2) for bidirectional I²C plus an extra signal. The ISO1640DWR has 2 channels (1 input each side) for a single bidirectional I²C bus. Both share the same 5000 Vrms isolation, 50 Mbps data rate, propagation delay, and 16-SOIC package.
Yes. The part is rated for both I²C and SPI protocols at 50 Mbps. The 70 ns propagation delay (low to high) and 88 ns (high to low) are within SPI timing margins at that speed, provided the trace lengths are kept short.
Yes, the channel type is listed as both bidirectional and unidirectional. The I²C lines (SDA, SCL) are bidirectional; the third channel per side can be configured as unidirectional for signals like interrupts or enables.