Specifications
| Type | Description |
|---|---|
| Part Number | PCA9554 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package Case | SSOP (16) 6.20 mm x 5.30 mm; VQFN (16) 4.00 mm x 4.00 mm; QFN (16) 3.00 mm x 3.00 mm |
| Supply Voltage Range | 2.3 to 5.5 V; recommended operating conditions |
| Absolute Maximum Supply Voltage | -0.5 to 6 V; over operating free-air temperature range |
| Input Voltage Range | -0.5 to 6 V; absolute maximum ratings |
| Output Voltage Range | -0.5 to 6 V; absolute maximum ratings |
| Operating Free-Air Temperature | -40 to 85 °C; recommended operating conditions |
| Storage Temperature Range | -65 to 150 °C; absolute maximum ratings |
| I2C Bus Speed | 400 kHz; fast I2C bus |
| Number of I/O Ports | 8-bit; P0 through P7 |
| I/O Tolerance | 5 V tolerant; I/O pins |
| Hardware Address Pins | 3 pins; A0, A1, A2 allow up to eight devices on same I2C/SMBus |
| High-Level Input Voltage, SCL/SDA | 0.7 x VCC to VCC |
| High-Level Input Voltage, A2-A0/P7-P0 | 2 V to VCC |
| Low-Level Input Voltage, SCL/SDA | -0.5 to 0.3 x VCC |
| Low-Level Input Voltage, A2-A0/P7-P0 | -0.5 to 0.3 x VCC |
| High-Level Output Current | -10 mA; P7-P0 recommended operating condition |
| Low-Level Output Current | 25 mA; P7-P0 recommended operating condition |
| 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 rating |
| Continuous Output High Current | -50 mA; VO = 0 to VCC, absolute maximum rating |
| Continuous Current Through GND | -250 mA; absolute maximum rating |
| Continuous Current Through VCC | 160 mA; absolute maximum rating |
| ESD Human Body Model | 0 to 2000 V; ANSI/ESDA/JEDEC JS-001, all pins |
| ESD Charged Device Model | 0 to 1000 V; JESD22-C101, all pins |
| Input Diode Clamp Voltage | Max -1.2 V; II = -18 mA, VCC = 2.3 V to 5.5 V |
| Power-On Reset Voltage Rising | 1.2 to 1.5 V; VI = VCC or GND, IO = 0 |
| Power-On Reset Voltage Falling | 0.75 to 1 V; VI = VCC or GND, IO = 0 |
| P-Port High-Level Output Voltage at VCC 2.3 V | Min 1.8 V; IOH = -8 mA |
| P-Port High-Level Output Voltage at VCC 3 V | Min 2.6 V; IOH = -8 mA |
| P-Port High-Level Output Voltage at VCC 4.5 V | Min 3.1 V; IOH = -8 mA |
| P-Port High-Level Output Voltage at VCC 4.75 V | Min 4.1 V; IOH = -8 mA |
| SDA Low-Level Output Current | Min 3 mA, Max 8 mA; VOL = 0.4 V, VCC = 2.3 V to 5.5 V |
| INT Low-Level Output Current | Min 3 mA, Max 10 mA; VOL = 0.4 V, VCC = 2.3 V to 5.5 V |
| Input Leakage Current | ±1 µA; SCL, SDA, VI = VCC or GND, VCC = 2.3 V to 5.5 V |
| Address Input Leakage Current | ±1 µA; A2-A0, VI = VCC or GND, VCC = 2.3 V to 5.5 V |
| P-Port High-Level Input Current | Max 1 µA; VI = VCC, VCC = 2.3 V to 5.5 V |
| P-Port Low-Level Input Current | Max -100 µA; VI = GND, VCC = 2.3 V to 5.5 V |
| Interrupt Output Type | Open-drain, active-low; activated when input state differs from Input Port register state |
| Power-Up I/O State | All channels configured as inputs with weak pullup to VCC |
| Registers | Configuration, Input, Output, Polarity Inversion; 8-bit registers readable by system master |
| Junction-to-Ambient Thermal Resistance, DB SSOP | 113.2 °C/W; 16 pins |
| Junction-to-Ambient Thermal Resistance, DBQ SSOP | 121.7 °C/W; 16 pins |
| Junction-to-Ambient Thermal Resistance, DGV TVSOP | 120 °C/W; 16 pins |
| Junction-to-Ambient Thermal Resistance, DW SOIC | 57 °C/W; 16 pins |
| Junction-to-Ambient Thermal Resistance, PW TSSOP | 63.2 °C/W; 16 pins |
| Datasheet Status | request_only |
Product Overview
The PCA9554 is a Texas Instruments 8-bit I2C SMBus I/O expander in the Signal_Chain category. It provides P0 through P7 I/O ports and communicates over a fast I2C bus at 400 kHz. Three address pins, A0 through A2, allow up to eight devices on the same I2C/SMBus interface.
The device operates from a recommended 2.3 to 5.5 V supply and across a -40 to 85 °C operating free-air temperature range. I/O pins are 5 V tolerant, and power-up behavior configures all channels as inputs with weak pullup to VCC. Internal registers include configuration, input, output, and polarity inversion registers readable by the system master.
Package options include SSOP (16) 6.20 mm x 5.30 mm, VQFN (16) 4.00 mm x 4.00 mm, and QFN (16) 3.00 mm x 3.00 mm. The open-drain, active-low INT output is activated when an input state differs from the Input Port register state, supporting interrupt-driven I/O monitoring.
Key Features
- 8-bit I/O expansion on P0 through P7
- 400 kHz fast I2C bus operation
- 2.3 to 5.5 V recommended supply range
- 5 V tolerant I/O pins
- Three address pins support up to eight devices
- Open-drain active-low interrupt output
- Power-up inputs with weak pullup to VCC
- Configuration, input, output, and polarity inversion registers
- -40 to 85 °C operating free-air range
- SSOP, VQFN, and QFN package options
Typical Applications
- I2C/SMBus I/O expansion
- Eight-bit GPIO port extension
- Interrupt-driven input monitoring
- Multi-device I2C addressable control
- Polarity inversion register control
- Low-voltage logic interface expansion
Procurement Notes
When requesting a quote for PCA9554, 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 range does the PCA9554 support?
The PCA9554 has a recommended supply voltage range of 2.3 to 5.5 V. Its absolute maximum supply voltage rating is -0.5 to 6 V over the operating free-air temperature range.
How many I/O ports are available on the PCA9554?
The PCA9554 provides 8-bit I/O expansion through P0 to P7. At power on, all channels are configured as inputs with weak pullup to VCC.
What bus speed is specified for the PCA9554?
The extracted datasheet facts specify a 400 kHz fast I2C bus for the PCA9554. It is described as an 8-bit I2C SMBus I/O expander.
How does the interrupt output operate?
The INT output is open-drain and active-low. It is activated when an input state differs from the state stored in the Input Port register.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 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.