Specifications
| Type | Description |
|---|---|
| Part Number | TCA9555 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package / Case | TSSOP-24 (PW) 7.80 mm x 4.40 mm; SSOP-24 (DB) 8.20 mm x 5.30 mm; WQFN-24 (RTW) 4.00 mm x 4.00 mm; VQFN-24 (RGE) 4.00 mm x 4.00 mm |
| Supply Voltage Operating Range | 1.65-5.5 V; recommended operating condition |
| Standby Current Consumption | 3.5 uA maximum; feature summary |
| I2C Bus Speed | 400 kHz; fast I2C bus compatible |
| I/O Port Count | 16 bits; two 8-bit ports P00-P07 and P10-P17 |
| I/O Default State | Inputs; at power-on |
| I/O Pull-up Resistor | Internal pull-up included; pulls I/O to default high when configured as input and undriven |
| Address Pins | 3 pins; A0, A1, A2 hardware address selection |
| Maximum Devices on Bus | 8 devices; using configurable A0-A2 address pins on same I2C bus or SMBus |
| Interrupt Output | Open-drain active-low INT; connect INT to VCC through pull-up resistor |
| I/O Port Tolerance | 5 V tolerant; feature summary for I/O ports |
| Absolute Maximum Supply Voltage | -0.5 to 6 V; over operating free-air temperature range |
| Absolute Maximum Input Voltage | -0.5 to 6 V; input negative-voltage rating may be exceeded if current rating is observed |
| Absolute Maximum Output Voltage | -0.5 to 6 V; output voltage rating may be exceeded if current rating is observed |
| Input Clamp Current | -20 mA; VI < 0 V |
| Output Clamp Current | -20 mA; VO < 0 V |
| Input-Output Clamp Current | ±20 mA; VO < 0 V or VO > VCC |
| Continuous Output Low Current | 50 mA; VO = 0 to VCC, absolute maximum |
| Continuous Output High Current | -50 mA; VO = 0 to VCC, absolute maximum |
| Continuous Current Through GND | -250 mA; absolute maximum |
| Continuous Current Through VCC | 160 mA; absolute maximum |
| Maximum Junction Temperature | 100 °C; absolute maximum |
| Storage Temperature | -65 to 150 °C; absolute maximum |
| ESD HBM Rating | ±2000 V; human-body model per ANSI/ESDA/JEDEC JS-001 |
| ESD CDM Rating | ±1000 V; charged-device model per JESD22-C101 or ANSI/ESDA/JEDEC JS-002 |
| High-Level Input Voltage, SCL/SDA | 0.7 x VCC to VCC V; recommended operating condition |
| High-Level Input Voltage, A2-A0 and P-ports | 0.7 x VCC to 5.5 V; recommended operating condition |
| Low-Level Input Voltage, SCL/SDA | -0.5 to 0.3 x VCC V; recommended operating condition |
| Low-Level Input Voltage, A2-A0 and P-ports | -0.5 to 0.3 x VCC V; recommended operating condition |
| High-Level Output Current, P-ports | -10 mA; P07-P00 and P17-P10 recommended operating condition |
| Low-Level Output Current, P-ports | 25 mA; Tj <= 65°C |
| Low-Level Output Current, P-ports | 18 mA; Tj <= 85°C |
| Low-Level Output Current, P-ports | 11 mA; Tj <= 100°C |
| Low-Level Output Current, INT/SDA | 6 mA; Tj <= 85°C |
| Low-Level Output Current, INT/SDA | 3.5 mA; Tj <= 100°C |
| Operating Free-Air Temperature | -40 to 85 °C; recommended operating condition |
| Thermal Resistance Junction-to-Ambient, PW | 108.8 °C/W; TSSOP-24 package |
| Thermal Resistance Junction-to-Ambient, DB | 92.9 °C/W; SSOP-24 package |
| Thermal Resistance Junction-to-Ambient, RTW | 43.6 °C/W; WQFN-24 package |
| Thermal Resistance Junction-to-Ambient, RGE | 48.4 °C/W; VQFN-24 package |
| Input Diode Clamp Voltage | -1.2 V maximum; II = -18 mA, VCC = 1.65 V to 5.5 V |
| Power-On Reset Voltage Rising | 1.2 V typ, 1.5 V max; VCC rising, VI = VCC or GND, IO = 0, VCC = 1.65 V to 5.5 V |
| Power-On Reset Voltage Falling | 0.75 V typ, 1 V max; VCC falling, VI = VCC or GND, IO = 0, VCC = 1.65 V to 5.5 V |
| P-Port High-Level Output Voltage | 1.2 V minimum; IOH = -8 mA, VCC = 1.65 V |
| P-Port High-Level Output Voltage | 1.8 V minimum; IOH = -8 mA, VCC = 2.3 V |
| P-Port High-Level Output Voltage | 2.6 V minimum; IOH = -8 mA, VCC = 3 V |
| P-Port High-Level Output Voltage | 4.1 V minimum; IOH = -8 mA, VCC = 4.75 V |
| P-Port High-Level Output Voltage | 1.0 V minimum; IOH = -10 mA, VCC = 1.65 V |
| P-Port High-Level Output Voltage | 1.7 V minimum; IOH = -10 mA, VCC = 2.3 V |
| P-Port High-Level Output Voltage | 2.5 V minimum; IOH = -10 mA, VCC = 3 V |
| P-Port High-Level Output Voltage | 4.0 V minimum; IOH = -10 mA, VCC = 4.75 V |
| SDA Low-Level Output Current | 3 mA minimum; VOL = 0.4 V, VCC = 1.65 V to 5.5 V |
| P-Port Low-Level Output Current | 8 mA minimum; VOL = 0.5 V, VCC = 1.65 V to 5.5 V |
| P-Port Low-Level Output Current | 10 mA minimum; VOL = 0.7 V, VCC = 1.65 V to 5.5 V |
| INT Low-Level Output Current | 3 mA minimum; VOL = 0.4 V, VCC = 1.65 V to 5.5 V |
| SCL/SDA Input Leakage Current | ±1 uA; VI = VCC or GND, VCC = 1.65 V to 5.5 V |
| A2-A0 Input Leakage Current | ±1 uA; VI = VCC or GND, VCC = 1.65 V to 5.5 V |
| P-Port Input High Leakage Current | 1 uA maximum; VI = VCC, VCC = 1.65 V to 5.5 V |
| P-Port Input Low Leakage Current | -100 uA maximum; VI = GND, VCC = 1.65 V to 5.5 V |
| Datasheet Status | request_only |
Product Overview
The TCA9555 is a Texas Instruments 16-bit I2C I/O expander in the Signal_Chain category. It provides two 8-bit ports, P00-P07 and P10-P17, with I/O defaulting to input state at power-on. The device is fast I2C bus compatible at 400 kHz and operates across a recommended 1.65-5.5 V supply range.
Addressing is set through A0, A1, and A2 hardware address pins, allowing up to eight devices on the same I2C bus or SMBus. The port inputs include internal pull-up behavior when configured as inputs and undriven, and the I/O ports are 5 V tolerant. An open-drain active-low INT output is provided and is intended to connect to VCC through a pull-up resistor.
Package options include TSSOP-24 (PW), SSOP-24 (DB), WQFN-24 (RTW), and VQFN-24 (RGE). Thermal resistance to ambient is specified as 108.8 °C/W for PW, 92.9 °C/W for DB, 43.6 °C/W for RTW, and 48.4 °C/W for RGE. The device supports applications needing I2C-based digital I/O expansion, interrupt signaling, and multiple addressable expanders on one bus.
Key Features
- 16-bit I2C I/O expander with two 8-bit ports
- 1.65-5.5 V recommended operating supply range
- 400 kHz fast I2C bus compatible interface
- I/O ports default to inputs at power-on
- Internal pull-up included for undriven input ports
- Three address pins support eight bus devices
- Open-drain active-low INT output with pull-up connection
- 5 V tolerant I/O ports
- 3.5 uA maximum standby current
- -40 to 85 °C operating free-air temperature
Typical Applications
- I2C digital I/O expansion
- Two-port GPIO control
- Interrupt-monitored input systems
- Multi-device I2C bus expansion
- Low-standby-current control nodes
- 5 V tolerant port interfacing
- Address-selectable SMBus peripherals
Procurement Notes
When requesting a quote for TCA9555, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
What supply voltage range does the TCA9555 support?
The TCA9555 has a recommended operating supply voltage range of 1.65-5.5 V. Absolute maximum supply voltage is specified from -0.5 to 6 V over the operating free-air temperature range.
How many I/O ports are available on the TCA9555?
The device provides 16 I/O bits arranged as two 8-bit ports, P00-P07 and P10-P17. At power-on, the I/O ports default to inputs.
How many TCA9555 devices can share one I2C bus?
Three hardware address pins, A0, A1, and A2, provide address selection. Using these configurable pins, up to eight devices can be placed on the same I2C bus or SMBus.
What package options are listed for the TCA9555?
Package options include TSSOP-24 (PW) 7.80 mm x 4.40 mm, SSOP-24 (DB) 8.20 mm x 5.30 mm, WQFN-24 (RTW) 4.00 mm x 4.00 mm, and VQFN-24 (RGE) 4.00 mm x 4.00 mm.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 8, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.