Specifications
| Type | Description |
|---|---|
| Part Number | TCA9535_I2C-IO |
| Manufacturer | Texas Instruments |
| Product Type | Interface IC |
| Category | Signal Chain |
| Package/Case | TSSOP-24 7.80 mm x 4.40 mm; SSOP-24 6.20 mm x 5.30 mm; WQFN-24 4.00 mm x 4.00 mm; VQFN-24 4.00 mm x 4.00 mm |
| Part Number | TCA9535 |
| Manufacturer | Texas Instruments |
| Interface Type | I2C and SMBus; two-line bidirectional I2C bus or SMBus protocol |
| I/O Expansion Width | 16 bits; general-purpose parallel input and output expansion |
| Supply Voltage | 1.65 V to 5.5 V; recommended operating conditions |
| I2C Bus Speed | 400 kHz; Fast I2C bus |
| I/O Port Voltage Tolerance | 5 V tolerant; I/O ports |
| Addressing | 3 hardware address pins; up to 8 devices; A0, A1, A2 connected to VCC or GND |
| Interrupt Output | Open-drain active-low INT; connect INT to VCC through external pull-up resistor |
| Power-On I/O State | All P-port I/Os configured as inputs at power on |
| Internal I/O Pull-Up Resistors | Not included; unused input pins require external pull-ups or pull-downs |
| Register Types | Configuration, Input Port, Output Port, Polarity Inversion; two 8-bit registers for each function |
| Package Options | TSSOP-24, SSOP-24, WQFN-24, VQFN-24 |
| Absolute Maximum Supply Voltage | -0.5 V to 6 V; over operating free-air temperature range |
| Absolute Maximum Input Voltage | -0.5 V to 6 V; input voltage VI |
| Absolute Maximum Output Voltage | -0.5 V to 6 V; output voltage VO |
| 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, 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 |
| Maximum Junction Temperature | 100 °C; TJ(MAX), absolute maximum rating |
| Storage Temperature Range | -65 °C to 150 °C; absolute maximum rating |
| Operating Free-Air Temperature Range | -40 °C to 85 °C; recommended operating conditions |
| ESD Rating HBM | ±2000 V; human-body model per ANSI/ESDA/JEDEC JS-001 |
| ESD Rating CDM | ±1000 V; charged-device model per JESD22-C101 |
| High-Level Input Voltage | 0.7 x VCC to VCC; SCL, SDA recommended operating condition |
| High-Level Input Voltage | 0.7 x VCC to 5.5 V; A2-A0, P07-P00, P17-P10 recommended operating condition |
| Low-Level Input Voltage | -0.5 V to 0.3 x VCC; SCL, SDA, A2-A0, P07-P00, P17-P10 |
| P-Port High-Level Output Current | -10 mA; P07-P00, P17-P10 recommended operating condition |
| P-Port Low-Level Output Current | 25 mA max; TJ <= 65°C, P07-P00, P17-P10 |
| P-Port Low-Level Output Current | 18 mA max; TJ <= 85°C, P07-P00, P17-P10 |
| P-Port Low-Level Output Current | 11 mA max; TJ <= 100°C, P07-P00, P17-P10 |
| INT and SDA Low-Level Output Current | 6 mA max; TJ <= 85°C |
| INT and SDA Low-Level Output Current | 3.5 mA max; TJ <= 100°C |
| Input Diode Clamp Voltage | -1.2 V max; II = -18 mA, VCC = 1.65 V to 5.5 V |
| Power-On Reset Voltage Rising | 1.2 V min, 1.5 V max; VCC rising, VI = VCC or GND, IO = 0 |
| Power-On Reset Voltage Falling | 0.75 V min, 1 V max; VCC falling, VI = VCC or GND, IO = 0 |
| P-Port High-Level Output Voltage | 1.2 V min; VCC = 1.65 V, IOH = -8 mA |
| P-Port High-Level Output Voltage | 1.8 V min; VCC = 2.3 V, IOH = -8 mA |
| P-Port High-Level Output Voltage | 2.6 V min; VCC = 3 V, IOH = -8 mA |
| P-Port High-Level Output Voltage | 4.1 V min; VCC = 4.75 V, IOH = -8 mA |
| P-Port High-Level Output Voltage | 1 V min; VCC = 1.65 V, IOH = -10 mA |
| P-Port High-Level Output Voltage | 1.7 V min; VCC = 2.3 V, IOH = -10 mA |
| P-Port High-Level Output Voltage | 2.5 V min; VCC = 3 V, IOH = -10 mA |
| P-Port High-Level Output Voltage | 4 V min; VCC = 4.75 V, IOH = -10 mA |
| SDA Low-Level Output Current | 3 mA; VOL = 0.4 V, VCC = 1.65 V to 5.5 V |
| P-Port Low-Level Output Current | 8 mA; VOL = 0.5 V, VCC = 1.65 V to 5.5 V |
| P-Port Low-Level Output Current | 10 mA; VOL = 0.7 V, VCC = 1.65 V to 5.5 V |
| INT Low-Level Output Current | 3 mA; VOL = 0.4 V, VCC = 1.65 V to 5.5 V |
| SCL/SDA Input Leakage Current | ±1 µA; VI = VCC or GND, VCC = 1.65 V to 5.5 V |
| A2-A0 Input Leakage Current | ±1 µA; VI = VCC or GND, VCC = 1.65 V to 5.5 V |
| Thermal Resistance Junction-to-Ambient | 108.8 °C/W; PW TSSOP-24 package |
| Thermal Resistance Junction-to-Ambient | 92.9 °C/W; DB SSOP-24 package |
| Thermal Resistance Junction-to-Ambient | 43.6 °C/W; RTW WQFN-24 package |
| Thermal Resistance Junction-to-Ambient | 48.4 °C/W; RGE VQFN-24 package |
| Datasheet Status | request_only |
Product Overview
The TCA9535_I2C-IO is a Texas Instruments 16-bit I2C SMBus I/O expander for Interface designs that need parallel input and output expansion from a two-line serial bus. It supports I2C and SMBus communication, with Fast I2C bus operation specified at 400 kHz. Three hardware address pins, A0, A1, and A2, allow up to eight devices when tied to VCC or GND.
Key Features
- 16-bit general-purpose parallel I/O expansion
- I2C and SMBus two-line bidirectional interface
- Fast I2C bus operation to 400 kHz
- 1.65 V to 5.5 V recommended supply range
- 5 V-tolerant I/O port inputs and outputs
- Three hardware address pins support up to eight devices
- Open-drain active-low INT output with external pull-up
- Power-on default configures all P-port I/Os as inputs
- Configuration, input, output, and polarity inversion registers
- Available in TSSOP-24, SSOP-24, WQFN-24, and VQFN-24
Typical Applications
- I2C GPIO expansion
- SMBus I/O expansion
- Multi-device addressed I/O designs
- Interrupt-driven input monitoring
- 5 V-tolerant port interfacing
- Low-voltage digital control interfaces
- Parallel input and output extension
Procurement Notes
When requesting a quote for TCA9535_I2C-IO, 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 TCA9535_I2C-IO?
TCA9535_I2C-IO is a Texas Instruments 16-bit I2C SMBus I/O expander. It provides general-purpose parallel input and output expansion using a two-line bidirectional I2C bus or SMBus protocol.
What supply voltage range does this device support?
The recommended supply voltage range is 1.65 V to 5.5 V. The absolute maximum supply voltage rating is -0.5 V to 6 V over the specified operating free-air temperature range.
How many TCA9535 devices can share one bus?
The device has three hardware address pins, A0, A1, and A2. When these pins are connected to VCC or GND, up to eight devices can be addressed.
What is the default I/O state at power-on?
At power-on, all P-port I/Os are configured as inputs. The extracted facts also specify that the device does not include internal I/O pull-up resistors, so unused input pins require external pull-ups or pull-downs.
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.