Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| GPIO | 8 configurable I/O pins |
| Supply | 1.65 V to 5.5 V |
| Bus | I²C/SMBus up to 400 kHz |
| Addressing | 3 address pins; up to 8 devices |
| Interrupt | Open-drain active-low INT |
| Registers | Input/output/configuration/polarity inversion |
| Startup | All channels inputs; no-glitch power-up |
| Exact Package / Packing | TSSOP (PW), 16 pins; 2000-piece large tape and reel |
Product Overview
TCA9554PWR is an 8-bit I²C GPIO expander for low-voltage systems with up to eight hardware address choices. Its basic register model is deliberately simple: direction, output, input and polarity inversion are controlled through four main register functions.
For new designs, its selection is often driven by compatibility with an existing 9554 register/address convention or BOM rather than a unique feature absent from every other 8-bit expander. Skill01 therefore preserves that exact-family value instead of inventing unsupported differences from TCA9534.
The PWR code is the standard 2000-piece TSSOP reel option with visible gull-wing leads.
For related devices, see HKEQGOO’s I/O Expanders category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | TCA9554PWR |
| GPIO | 8 configurable I/O pins |
| Supply | 1.65 V to 5.5 V |
| Bus | I²C/SMBus up to 400 kHz |
| Addressing | 3 address pins; up to 8 devices |
| Interrupt | Open-drain active-low INT |
| Registers | Input/output/configuration/polarity inversion |
| Startup | All channels inputs; no-glitch power-up |
| Exact Package / Packing | TSSOP (PW), 16 pins; 2000-piece large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | TCA9554 family PWR marking per TI addendum |
Functional Highlights
Register-family compatibility can be more important than feature-count differences
Firmware already written around the 9554 register/address behavior may justify retaining TCA9554 even when another 8-bit expander has similar headline GPIO count.
Simple interrupt/output behavior keeps firmware small
The device does not add keypad FIFO, translating dual rails or hardware reset; that simplicity can be useful when those functions are unnecessary.
Design Considerations
- Verify software register/address expectations against TCA9554 rather than assuming any 8-bit I²C expander is drop-in compatible.
- Provide safe external bias during the default-input startup state.
- Check bus pull-up and interrupt sharing if multiple devices use the same open-drain lines.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists TCA9554PWR as Active / Production; TSSOP (PW), 16 pins; 2000-piece large tape and reel; −40°C to +85°C.
Related Engineering Resources
Quality & Verification Support
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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