Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| GPIO | 8 configurable I/O pins |
| Voltage Translation | 1.65 V to 5.5 V domains; I²C and P-port rails can differ |
| Bus | I²C/SMBus up to 400 kHz |
| Addressing | 1 hardware address pin; 2 devices per bus |
| Control | Active-low RESET and active-low INT |
| Startup | All channels inputs; no-glitch power-up |
| Standby | 1 µA stated standby current |
| Exact Package / Packing | VQFN (RGT), 16 pins, 3 mm × 3 mm; 3000-piece large tape and reel |
Product Overview
TCA6408ARGTR is an 8-bit GPIO expander built specifically for systems where the processor I²C rail and peripheral I/O rail may use different voltages. It can translate between common 1.8 V, 2.5 V, 3.3 V and 5 V domains while adding eight remotely controlled pins.
RESET is a meaningful system feature: firmware or supervisor logic can return all ports to their input default without cycling the power rail. This helps isolate misconfigured peripherals during boot/recovery.
The exact RGTR code is the compact 3 mm VQFN large-reel option. Compared with a leaded TSSOP variant, it saves area but makes exposed-pad/leadless assembly and inspection part of manufacturing qualification.
For related devices, see HKEQGOO’s I/O Expanders category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | TCA6408ARGTR |
| GPIO | 8 configurable I/O pins |
| Voltage Translation | 1.65 V to 5.5 V domains; I²C and P-port rails can differ |
| Bus | I²C/SMBus up to 400 kHz |
| Addressing | 1 hardware address pin; 2 devices per bus |
| Control | Active-low RESET and active-low INT |
| Startup | All channels inputs; no-glitch power-up |
| Standby | 1 µA stated standby current |
| Exact Package / Packing | VQFN (RGT), 16 pins, 3 mm × 3 mm; 3000-piece large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | ZVU |
Functional Highlights
Translation removes the need to align GPIO and I²C/peripheral rails
The device is useful when the host operates at a lower core/I²C voltage while external control/status pins live on a higher domain. Both supply rails and sequencing must stay within datasheet conditions.
Hardware RESET gives deterministic recovery
A stuck software state can be cleared externally, returning pins to inputs. External hardware still needs safe pulls so the reset state is electrically defined.
Design Considerations
- Verify both rail voltages and power sequencing rather than treating the device as a single-supply expander.
- Provide safe external bias for pins whose default-input state must not float during reset.
- Follow RGT exposed-pad/land-pattern guidance for production assembly.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists TCA6408ARGTR as Active / Production; VQFN (RGT), 16 pins; 3000-piece large tape and reel; Level-2-260C-1 YEAR; −40°C to +85°C; marking ZVU.
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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