Specifications
| Type | Description |
|---|---|
| Part Number | TCA9554 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package / Case | 16-pin TSSOP 5.00 mm x 4.40 mm, SSOP 4.90 mm x 3.90 mm, SSOP 6.20 mm x 5.30 mm, SOIC 7.50 mm x 10.30 mm |
| Supply Voltage Range | 1.65-5.5 V; operating power-supply voltage |
| I2C Clock Frequency | 100 kHz and 400 kHz; supports Standard-mode and Fast-mode I2C |
| I/O Port Count | 8 bits; general-purpose parallel input/output expansion |
| Interrupt Output | Open-drain active-low INT; generated when an input port changes state |
| Address Pins | 3 pins; A0, A1, A2 hardware-selectable address inputs |
| Maximum Devices Per I2C Bus | 8 devices; using three hardware address pins |
| Power-Up I/O State | All channels configured as inputs; at power-up |
| Absolute Maximum Supply Voltage | -0.5 to 6 V; VCC over operating free-air temperature range |
| Absolute Maximum Input Voltage | -0.5 to 6 V; input voltage may be exceeded if input current ratings are observed |
| Absolute Maximum Output Voltage | -0.5 to 6 V; output voltage may be exceeded if output current ratings are observed |
| Input Clamp Current | -20 mA; VI < 0 |
| Output Clamp Current | -20 mA; VO < 0 |
| Input-Output Clamp Current | ±20 mA; VO < 0 or VO > VCC |
| Continuous Output Low Current Per P-Port | 50 mA; VO = 0 to VCC, absolute maximum rating |
| Continuous Output High Current Per P-Port | -50 mA; VO = 0 to VCC, absolute maximum rating |
| Continuous Current Through GND | 250 mA; all P-ports, absolute maximum rating |
| Continuous Current Through VCC | -160 mA; absolute maximum rating |
| Maximum Junction Temperature | 100 °C; absolute maximum rating |
| Storage Temperature | -65 to 150 °C; absolute maximum rating |
| ESD Human Body Model | ±2000 V; per ANSI/ESDA/JEDEC JS-001 |
| ESD Charged Device Model | ±1000 V; per JEDEC JESD22-C101 |
| Recommended Supply Voltage | 1.65-5.5 V; recommended operating conditions |
| SCL/SDA High-Level Input Voltage | Min 0.7 x VCC, Max VCC; VCC = 1.65 V to 5.5 V |
| A0/A1/A2/P-Port High-Level Input Voltage | Min 0.7 x VCC, Max 5.5 V; VCC = 1.65 V to 2.7 V |
| A0/A1/A2/P-Port High-Level Input Voltage | Min 0.8 x VCC, Max 5.5 V; VCC = 3 V to 5.5 V |
| SCL/SDA Low-Level Input Voltage | Min -0.5 V, Max 0.3 x VCC; VCC = 1.65 V to 5.5 V |
| A0/A1/A2/P-Port Low-Level Input Voltage | Min -0.5 V, Max 0.3 x VCC; VCC = 1.65 V to 2.7 V |
| A0/A1/A2/P-Port Low-Level Input Voltage | Min -0.5 V, Max 0.2 x VCC; VCC = 3 V to 5.5 V |
| P-Port Low-Level Output Current | 25 mA; Tj <= 65 °C, recommended operating condition |
| P-Port Low-Level Output Current | 18 mA; Tj <= 85 °C, recommended operating condition |
| P-Port Low-Level Output Current | 9 mA; Tj <= 100 °C, recommended operating condition |
| INT/SDA Low-Level Output Current | 6 mA; Tj <= 85 °C, recommended operating condition |
| INT/SDA Low-Level Output Current | 3 mA; Tj <= 100 °C, recommended operating condition |
| P-Port High-Level Output Current | -10 mA; any P-port P7-P0 |
| Recommended Continuous Current Through GND | 200 mA; all P-ports P7-P0, INT, and SDA |
| Recommended Continuous Current Through VCC | -80 mA; all P-ports P7-P0 |
| Operating Free-Air Temperature | -40 to 85 °C; recommended operating conditions |
| Thermal Resistance Junction-to-Ambient | 122 °C/W; PW TSSOP, 16 pins |
| Thermal Resistance Junction-to-Ambient | 121.7 °C/W; DBQ SSOP, 16 pins |
| Thermal Resistance Junction-to-Ambient | 113.2 °C/W; DB SSOP, 16 pins |
| Thermal Resistance Junction-to-Ambient | 84.7 °C/W; DW SOIC, 16 pins |
| Input Diode Clamp Voltage | Max -1.2 V; II = -18 mA, VCC = 1.65 V to 5.5 V |
| Power-On Reset Voltage Rising | Typ 1.2 V, Max 1.5 V; VI = VCC or GND, IO = 0 |
| Power-On Reset Voltage Falling | Typ 0.75 V, Max 1 V; VI = VCC or GND, IO = 0 |
| P-Port High-Level Output Voltage | Min 1.2 V; VCC = 1.65 V, IOH = -8 mA |
| P-Port High-Level Output Voltage | Min 1.8 V; VCC = 2.3 V, IOH = -8 mA |
| P-Port High-Level Output Voltage | Min 2.6 V; VCC = 3 V, IOH = -8 mA |
| P-Port High-Level Output Voltage | Min 4.1 V; VCC = 4.5 V, IOH = -8 mA |
| SDA Low-Level Output Current | Min 3 mA, Typ 11 mA; VOL = 0.4 V, VCC = 1.65 V to 5.5 V |
| INT Low-Level Output Current | Min 3 mA, Typ 7 mA; VOL = 0.4 V, VCC = 1.65 V to 5.5 V |
| SCL/SDA Input Current | ±1 µA; VI = VCC or GND, VCC = 1.65 V to 5.5 V |
| A0/A1/A2 Input Current | ±1 µA; VI = VCC or GND, VCC = 1.65 V to 5.5 V |
| P-Port High-Level Input Current | 1 µA; VI = VCC, VCC = 1.65 V to 5.5 V |
| P-Port Low-Level Input Current | -100 µA; VI = GND, VCC = 1.65 V to 5.5 V |
| Datasheet Status | request_only |
Product Overview
The TCA9554 is a Texas Instruments 8-bit I2C I/O expander in the Signal_Chain category. It adds general-purpose parallel input/output expansion through an I2C interface and supports Standard-mode and Fast-mode operation at 100 kHz and 400 kHz. Three hardware address pins, A0, A1, and A2, allow up to 8 devices on the same I2C bus.
The device operates from a 1.65-5.5 V supply. At power-up, all channels are configured as inputs, and an open-drain active-low INT output is generated when an input port changes state. Recommended operating conditions include -40 to 85 °C free-air temperature and specified P-port, SDA, and INT current limits.
Package options cover 16-pin TSSOP 5.00 mm x 4.40 mm, SSOP 4.90 mm x 3.90 mm, SSOP 6.20 mm x 5.30 mm, and SOIC 7.50 mm x 10.30 mm. Thermal resistance junction-to-ambient values are specified for the PW TSSOP, DBQ SSOP, DB SSOP, and DW SOIC packages.
Key Features
- 8-bit general-purpose parallel input/output expansion
- 1.65-5.5 V recommended supply range
- Standard-mode and Fast-mode I2C support
- 100 kHz and 400 kHz I2C clock operation
- Open-drain active-low INT for input state changes
- Three hardware address pins A0, A1, and A2
- Up to 8 devices on one I2C bus
- All channels power up configured as inputs
- -40 to 85 °C operating free-air temperature
- 16-pin TSSOP, SSOP, and SOIC package options
Typical Applications
- I2C GPIO expansion
- Parallel input/output expansion
- Addressable multi-device I2C buses
- Input state change interrupt monitoring
- Low-voltage digital control interfaces
- Systems needing power-up input defaults
Procurement Notes
When requesting a quote for TCA9554, 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 type of device is the TCA9554?
The TCA9554 is an 8-bit I2C I/O expander from Texas Instruments. It provides general-purpose parallel input/output expansion through an I2C interface and supports Standard-mode and Fast-mode clock operation.
What supply voltage range does the TCA9554 support?
The TCA9554 operating and recommended supply voltage range is 1.65-5.5 V. Absolute maximum VCC is specified as -0.5 to 6 V over the operating free-air temperature range.
How many TCA9554 devices can share one I2C bus?
Up to 8 TCA9554 devices can share one I2C bus when the three hardware address pins A0, A1, and A2 are used for address selection.
What happens to the I/O ports at power-up?
At power-up, all TCA9554 channels are configured as inputs. The device also provides an open-drain active-low INT output generated when an input port changes state.
Which package options are listed for the TCA9554?
Listed package options include 16-pin TSSOP 5.00 mm x 4.40 mm, SSOP 4.90 mm x 3.90 mm, SSOP 6.20 mm x 5.30 mm, and SOIC 7.50 mm x 10.30 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.