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 on power-up |
| Exact Package / Packing | TSSOP (PW), 16 pins; 2000-piece large tape and reel |
Product Overview
TCA9534PWR is a simple 8-bit low-voltage GPIO expander for hosts that need more control/status pins but do not need hardware RESET or voltage-translation rail separation. It supports supply rails down to 1.65 V and up to eight hardware addresses.
The three address pins are useful when several 8-bit expanders share one bus. In contrast, TCA6408A offers only two addresses but adds hardware RESET and explicit translating-domain capability; choosing between them depends on system recovery/voltage architecture rather than bit count alone.
The TSSOP-16 PWR option provides visible leads and a 2000-piece reel, making it straightforward for standard assembly and rework.
For related devices, see HKEQGOO’s I/O Expanders category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | TCA9534PWR |
| 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 on power-up |
| Exact Package / Packing | TSSOP (PW), 16 pins; 2000-piece large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | PW534 |
Functional Highlights
Eight address combinations scale well across distributed small GPIO banks
Using multiple local 8-bit expanders can reduce long parallel traces and keep status/control routing near connectors.
No dedicated RESET means recovery depends on power cycle/software/bus state
If deterministic external reset of the expander is a requirement, TCA9534 is not equivalent to TCA6408A/9539 variants that expose reset.
Design Considerations
- Use external safe pulls for inputs/loads that cannot float during power-up.
- Confirm that lack of a dedicated reset pin is acceptable for the product fault-recovery strategy.
- Size bus pull-ups for the total capacitance when using several addressed devices.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists TCA9534PWR as Active / Production; TSSOP (PW), 16 pins; 2000-piece large tape and reel; Level-1-260C-UNLIM; −40°C to +85°C; marking PW534.
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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