Specifications
| Type | Description |
|---|---|
| Part Number | PCA9555 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package Case | SSOP-24 DB 8.20 mm x 5.30 mm; SSOP-24 DBQ 8.65 mm x 3.90 mm; TVSOP-24 DGV 5.00 mm x 4.40 mm; SOIC-24 DW 15.4 mm x 7.50 mm; SSOP-24 PW 7.80 mm x 4.40 mm; VQFN-24 RGE 4.00 mm x 4.00 mm |
| Supply Voltage Operating Range | 2.3 to 5.5 V; recommended operating conditions |
| Supply Voltage Absolute Maximum | -0.5 to 6 V; over operating free-air temperature range |
| Input Voltage Absolute Maximum | -0.5 to 6 V; input negative-voltage rating may be exceeded if input current rating is observed |
| Output Voltage Absolute Maximum | -0.5 to 6 V; output voltage rating may be exceeded if output current rating is 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 | 50 mA; VO = 0 to VCC |
| Continuous Output High Current | -50 mA; VO = 0 to VCC |
| Continuous Current Through GND | -250 mA; absolute maximum ratings |
| Continuous Current Through VCC | 160 mA; absolute maximum ratings |
| Storage Temperature Range | -65 to 150 °C; absolute maximum ratings |
| Operating Free-Air Temperature | -40 to 85 °C; recommended operating conditions |
| High-Level Input Voltage | 0.7 x VCC to VCC; SCL, SDA |
| High-Level Input Voltage | 0.7 x VCC to 5.5 V; A2-A0, P07-P00, P17-P10 |
| Low-Level Input Voltage | -0.5 to 0.3 x VCC; SCL, SDA |
| Low-Level Input Voltage | -0.5 to 0.3 x VCC; A2-A0, P07-P00, P17-P10 |
| High-Level Output Current | -10 mA; P07-P00, P17-P10 |
| Low-Level Output Current | 25 mA; P07-P00, P17-P10 |
| I2C Bus Frequency | 400 kHz; Fast I2C bus compatibility |
| Standby Current | 1 µA max; standby-current consumption |
| I/O Port Count | 16 bits; remote I/O expansion via I2C interface |
| Address Selection | 3 hardware address pins; up to 8 devices; A0, A1, A2 connected directly to VCC or ground |
| Default Power-On I/O Configuration | Inputs; at power on |
| Interrupt Output Type | Open-drain active-low; INT pin; connect to VCC through pullup resistor |
| I/O Port Tolerance | 5-V tolerant; I/O ports |
| Port Output Structure | Push-pull; P00-P07 and P10-P17 pins |
| HBM ESD Rating | 2000 V; human body model per ANSI/ESDA/JEDEC JS-001, all pins |
| CDM ESD Rating | 1000 V; charged device model per JESD22-C101 or ANSI/ESDA/JEDEC JS-002, all pins |
| Latch-Up Performance | Exceeds 100 mA; per JESD 78, Class II |
| Input Diode Clamp Voltage | -1.2 V max; II = -18 mA, VCC = 2.3 V to 5.5 V |
| Thermal Resistance Junction-to-Ambient | 92.9 °C/W; DB SSOP-24 package |
| Thermal Resistance Junction-to-Ambient | 81.8 °C/W; DBQ QSOP-24 package |
| Thermal Resistance Junction-to-Ambient | 105.4 °C/W; DGV TVSOP-24 package |
| Thermal Resistance Junction-to-Ambient | 66.7 °C/W; DW SOIC-24 package |
| Thermal Resistance Junction-to-Ambient | 108.8 °C/W; PW TSSOP-24 package |
| Thermal Resistance Junction-to-Ambient | 48.4 °C/W; RGE QFN-24 package |
| Datasheet Status | request_only |
Product Overview
The PCA9555 is a Texas Instruments 16-bit I2C SMBus I/O expander in the Signal_Chain category. It provides remote I/O expansion through an I2C-compatible interface with 400 kHz fast-bus compatibility. At power on, the I/O configuration defaults to inputs, and three hardware address pins support up to 8 devices when A0, A1, and A2 are connected directly to VCC or ground.
The device operates from a recommended 2.3 to 5.5 V supply across a -40 to 85 °C operating free-air temperature range. The I/O ports are 5-V tolerant, and P00-P07 and P10-P17 use push-pull output structures. Output drive ratings include -10 mA high-level output current and 25 mA low-level output current for the port pins. The INT output is open-drain active-low and is intended to connect to VCC through a pullup resistor.
Package options include SSOP-24 DB, SSOP-24 DBQ, TVSOP-24 DGV, SOIC-24 DW, SSOP-24 PW, and VQFN-24 RGE. Thermal resistance junction-to-ambient ranges from 48.4 °C/W for the RGE QFN-24 package to 108.8 °C/W for the PW TSSOP-24 package.
Key Features
- 16-bit remote I/O expansion through I2C interface
- 400 kHz fast I2C bus compatibility
- 2.3 to 5.5 V recommended supply range
- 1 µA maximum standby-current consumption
- Three hardware address pins support up to 8 devices
- Power-on default configures I/O ports as inputs
- Open-drain active-low INT output with pullup resistor
- 5-V tolerant I/O ports for port interface flexibility
- Push-pull outputs on P00-P07 and P10-P17
- -40 to 85 °C operating free-air temperature range
Typical Applications
- Remote I/O expansion
- I2C SMBus GPIO extension
- Multi-device addressed I/O nodes
- Interrupt-based input monitoring
- 5-V tolerant port interfacing
- Push-pull output control
- Low-standby-current I/O expansion
Procurement Notes
When requesting a quote for PCA9555, 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 PCA9555 support?
The PCA9555 operates from a recommended 2.3 to 5.5 V supply range. 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 PCA9555?
The PCA9555 provides 16 bits of remote I/O expansion through an I2C interface. At power on, the I/O configuration defaults to inputs.
What bus speed is specified for the PCA9555 interface?
The PCA9555 is specified for 400 kHz fast I2C bus compatibility. It is described as a 16-bit I2C SMBus I/O expander.
What package options are listed for the PCA9555?
Listed packages include SSOP-24 DB, SSOP-24 DBQ, TVSOP-24 DGV, SOIC-24 DW, SSOP-24 PW, and VQFN-24 RGE, with package dimensions provided for each option.
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.