NXP PCAL9555APW,118, Agile series, 16-bit I²C/SMBus GPIO expander, 400 kHz, 1.65 V – 5.5 V supply, open-drain/push-pull output, POR, interrupt output, -40°C to 85°C, 24-TSSOP.
| Parameter | Value |
|---|---|
| Series | Agile |
| Output type | Open Drain, Push-Pull |
| Mounting | Surface Mount |
| Voltage | 1.65V ~ 5.5V |
| Current - output source (Sink) | 10mA, 25mA |
| Frequency | 400 kHz |
| Interface | I²C, SMBus |
| Operating temperature | -40°C ~ 85°C |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Features | POR |
| Number of i (O) | 16 |
| Case | 24-TSSOP (0.173\", 4.40mm Width) |
| Interrupt output | Yes |
Each I/O can source 10 mA or sink 25 mA. The 400 kHz clock rate is the I²C bus speed — fine for reading switch banks or setting outputs at loop rates up to 25 kHz. If you need faster updates, this part isn't the one; look at a parallel-bus expander instead.
Housed in a 24-TSSOP (4.40 mm width), surface-mount only. No AEC-Q100 qualification here — this is the industrial-grade variant, not automotive.
ROHS3 compliant. Active lifecycle status.
Yes. The INT pin asserts low when any input changes state, allowing the host to read the port only on change instead of polling.
The PCAL9555APW includes a Power-On Reset (POR) feature that the PCA9555A lacks. POR forces all outputs to a defined state at power-up, which matters in safety-critical or fail-safe designs. Otherwise the two are pin-compatible and share the same I²C address map.