Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| GPIO | 16 configurable I/O pins |
| Supply | 1.65 V to 5.5 V |
| Bus | I²C/SMBus up to 400 kHz |
| Addressing | 3 hardware address pins; up to 8 devices |
| Interrupt | Open-drain active-low INT |
| Registers | Two-bank input/output/configuration/polarity inversion |
| Standby | 3.5 µA maximum stated feature |
| Exact Package / Packing | TSSOP (PW), 24 pins; 2000-piece large tape and reel |
Product Overview
TCA9555PWR is a 16-bit low-voltage I²C GPIO expander with three address pins, allowing up to eight devices on one bus. It therefore favors address density over a dedicated external RESET pin.
Compared with the older PCA9555, TCA9555 supports operation down to 1.65 V, which is useful on modern low-voltage controllers. Compared with TCA9539, it doubles same-bus address combinations but omits the explicit reset input.
The PWR exact order code is the leaded TSSOP-24 2000-piece reel option and is straightforward to inspect/rework.
For related devices, see HKEQGOO’s I/O Expanders category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | TCA9555PWR |
| GPIO | 16 configurable I/O pins |
| Supply | 1.65 V to 5.5 V |
| Bus | I²C/SMBus up to 400 kHz |
| Addressing | 3 hardware address pins; up to 8 devices |
| Interrupt | Open-drain active-low INT |
| Registers | Two-bank input/output/configuration/polarity inversion |
| Standby | 3.5 µA maximum stated feature |
| Exact Package / Packing | TSSOP (PW), 24 pins; 2000-piece large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | PW555 |
Functional Highlights
Eight addresses support very large remote GPIO counts without an I²C mux
Eight 16-bit devices can theoretically expose 128 GPIOs on one address segment, subject to bus capacitance/interrupt architecture.
Low-voltage support is a real migration advantage over PCA9555
A design moving its logic rail below 2.3 V can retain a similar 16-bit expander role with TCA9555, provided register/pin/system compatibility is verified.
Design Considerations
- Check aggregate I²C capacitance/pull-up timing before using many devices simply because addresses are available.
- Plan a recovery strategy because there is no dedicated RESET pin.
- Initialize output registers before changing direction from the input-default state.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists TCA9555PWR as Active / Production; TSSOP (PW), 24 pins; 2000-piece large tape and reel; Level-1-260C-UNLIM; −40°C to +85°C; marking PW555.
Related Engineering Resources
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Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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