Specifications
| Type | Description |
|---|---|
| Part Number | PCA9535 |
| 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; also shown in SOIC, QSOP, TSSOP, TVSOP packages |
| Supply Voltage Operating Range | 2.3 V to 5.5 V |
| I/O Expansion Width | 16-bit |
| Interface Type | I2C and SMBus |
| I2C Bus Speed | 400 kHz |
| Address Pins | 3 pins |
| Maximum Devices Per Bus | 8 devices |
| Interrupt Output Type | Open-drain active-low |
| Power-On I/O Default State | Inputs |
| Registers | Configuration, Input Port, Output Port, Polarity Inversion |
| I/O Port Tolerance | 5-V tolerant |
| Latch-Up Performance | >100 mA |
| ESD Human Body Model | 2000 V |
| ESD Charged Device Model | 1000 V |
| Absolute Maximum Supply Voltage Range | -0.5 V to 6 V |
| Absolute Maximum Input Voltage Range | -0.5 V to 6 V |
| Absolute Maximum Output Voltage Range | -0.5 V to 6 V |
| Input Clamp Current | -20 mA |
| Output Clamp Current | -20 mA |
| Input/Output Clamp Current | +/-20 mA |
| Continuous Output Low Current | 50 mA |
| Continuous Output High Current | -50 mA |
| Continuous Current Through GND | -250 mA |
| Continuous Current Through VCC | 160 mA |
| Storage Temperature Range | -65 °C to 150 °C |
| SCL/SDA High-Level Input Voltage | 0.7 x VCC to VCC |
| A2-A0 and P-Port High-Level Input Voltage | 0.7 x VCC to 5.5 V |
| SCL/SDA Low-Level Input Voltage | -0.5 V to 0.3 x VCC |
| A2-A0 and P-Port Low-Level Input Voltage | -0.5 V to 0.3 x VCC |
| P-Port High-Level Output Current | -10 mA |
| P-Port Low-Level Output Current | 25 mA |
| Operating Free-Air Temperature | -40 °C to 85 °C |
| Junction-to-Ambient Thermal Resistance | 92.9 °C/W |
| Junction-to-Ambient Thermal Resistance | 61 °C/W |
| Junction-to-Ambient Thermal Resistance | 86 °C/W |
| Junction-to-Ambient Thermal Resistance | 108.8 °C/W |
| Junction-to-Ambient Thermal Resistance | 48.4 °C/W |
| Junction-to-Ambient Thermal Resistance | 43.6 °C/W |
| Input Diode Clamp Voltage | -1.2 V max |
| Power-On Reset Voltage Rising | 1.2 V typ, 1.65 V max |
| Power-On Reset Voltage Falling | 0.75 V typ, 1 V max |
| P-Port High-Level Output Voltage | 1.8 V min |
| P-Port High-Level Output Voltage | 2.6 V min |
| P-Port High-Level Output Voltage | 4.1 V min |
| P-Port High-Level Output Voltage | 1.7 V min |
| P-Port High-Level Output Voltage | 2.5 V min |
| P-Port High-Level Output Voltage | 4 V min |
| SDA Low-Level Output Current | 3 mA min |
| P-Port Low-Level Output Current | 8 mA min, 20 mA max |
| P-Port Low-Level Output Current | 10 mA min, 24 mA max |
| INT Low-Level Output Current | 3 mA min |
| SCL/SDA Input Current | +/-1 uA max |
| A2-A0 Input Current | +/-1 uA max |
| P-Port High-Level Input Current | 1 uA max |
| P-Port Low-Level Input Current | -1 uA max |
| Operating Mode Supply Current | 100 uA typ, 200 uA max |
| Operating Mode Supply Current | 30 uA typ, 75 uA max |
| Operating Mode Supply Current | 20 uA typ, 50 uA max |
| Standby Mode Supply Current | 1.5 uA typ, 8.7 uA max |
| Standby Mode Supply Current | 0.9 uA typ, 4 uA max |
| Standby Mode Supply Current | 0.6 uA typ, 3 uA max |
| Additional Current In Standby Mode | 200 uA max |
| Datasheet Status | request_only |
Product Overview
The Texas Instruments PCA9535 is a 16-bit I2C I/O expander in the Signal_Chain category. It provides remote I/O expansion through an I2C and SMBus two-line bidirectional interface using SCL and SDA, with Fast I2C operation specified at 400 kHz. Three hardware address inputs, A0, A1, and A2, support up to eight PCA9535 devices on the same bus.
Key Features
- 16-bit remote I/O expansion over I2C and SMBus
- 2.3 V to 5.5 V VCC operating range
- Fast I2C bus operation up to 400 kHz
- Three hardware address pins support eight bus devices
- Open-drain active-low INT output for port changes
- I/O ports are 5-V tolerant
- Power-on default configures I/O ports as inputs
- Configuration, input, output, and polarity inversion registers
- -40 °C to 85 °C operating free-air temperature
- Standby current down to 0.6 uA typical at 2.7 V
Typical Applications
- Remote I/O expansion
- I2C-controlled digital ports
- SMBus I/O expansion
- Multi-device I/O buses
- Interrupt-driven port monitoring
- 5-V tolerant logic interfaces
- Low-standby-current systems
Procurement Notes
When requesting a quote for PCA9535, 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 interface does the PCA9535 use for host communication?
The PCA9535 communicates over an I2C and SMBus two-line bidirectional bus using SCL and SDA. The extracted datasheet facts specify Fast I2C bus operation at 400 kHz.
How many PCA9535 devices can share one I2C bus?
The PCA9535 has three hardware address inputs, A0, A1, and A2. Using those address pins, the extracted facts specify a maximum of eight devices on one bus.
What state are the PCA9535 I/O ports in at power on?
At power on, the PCA9535 I/O ports default to inputs. The device also provides configuration, input port, output port, and polarity inversion registers organized as two 8-bit registers for each function.
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.