TCA9539QPWRQ1
The TCA9539 is a 16-bit general-purpose I/O expander for I2C/SMBus that adds remote I/O ports to a host with limited pins. It operates from 1.65 V to 5.5 V, supports up to 400 kHz bus speed, four programmable addresses, and includes an interrupt-output and reset pin with configuration registers, rated -40 C to 85 C. It is used in automotive and industrial systems to expand MCU GPIO.
- Package
- TSSOP-24
Product overview
The TCA9539 is a 16-bit general-purpose I/O expander for I2C/SMBus that adds remote I/O ports to a host with limited pins. It operates from 1.65 V to 5.5 V, supports up to 400 kHz bus speed, four programmable addresses, and includes an interrupt-output and reset pin with configuration registers, rated -40 C to 85 C. It is used in automotive and industrial systems to expand MCU GPIO.
- Manufacturer
- TI
- Part number
- TCA9539QPWRQ1
- Category
- Interface
- Package
- TSSOP-24
- Packaging
- Tape & Reel
- Condition
- New & Original
- Compliance
- RoHS & REACH Compliant
- Lifecycle
- Confirm with manufacturer
- Lead time / MOQ
- Confirm with quotation
Technical parameters
35 parametersConstruction
- Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001
- ±2000
- A0, A1, RESET, P07–P00, P10–P17 0.7 ×
- 5.5
- Tj ≤ 65°C
- 25
- fscl I2C clock frequency
- 100 kHz
- tsch I2C clock high time
- 4 µs
- tscl I C clock low time
- 4.7 µs
- tsp I2C spike time
- 50 ns
- tsds I2C serial-data setup time
- 250 ns
- tsdh I C serial-data hold time
- 0 ns
- ticr I2C input rise time
- 1000 ns
- ticf I2C input fall time
- 300 ns
- tocf I2C output fall time 10-pF to 400-pF bus
- 300 ns
- tbuf I C bus free time between stop and start
- 4.7 µs
- tsts I2C start or repeated start condition setup
- 4.7 µs
- tsth I2C start or repeated start condition hold
- 4 µs
- tsps I C stop condition setup
- 4 µs
- tvd(data) Valid data time SCL low to SDA output valid
- 3.45 µs
- tvd(ack) Valid data time of ACK condition
- 3.45 µs
- Cb I2C bus capacitive load
- 400 pF
- tscl I2C clock low time
- 1.3 µs
- tsp I C spike time
- 50 ns
- tsdh I2C serial-data hold time
- 0 ns
- tW Reset pulse duration
- 6 ns
- tREC Reset recovery time
- 0 ns
- Time to reset; for VCC = 2.3 V - 5.5
- 400 ns
- Time to reset; for VCC = 1.65 V - 2.3
- 550 ns
- tiv Interrupt valid time P port
- 4 μs
- tir Interrupt reset delay time SCL
- 4 μs
- Output data valid; For VCC = 2.3 V - 5.5
- 200 ns
- Output data valid; For VCC = 1.65 V - 2.3
- 300 ns
- tps Input data setup time P port
- 150 ns
- tph Input data hold time P port
- 1 μs
Performance
- VCC Supply voltage
- 6 V
- IOH High-level output current P07–P00, P17–P10
- 10 mA
- VIK Input diode clamp voltage II = –18 mA 1.65 V to 5.5
- 1.2 V
Specifications & documentation
Use the official manufacturer documentation to verify electrical characteristics, package dimensions and operating limits before design approval.
Frequently asked questions
Common pre-quotation questions and selection notes to help you verify key parameters and sourcing before requesting a quote.
How do I verify the part is genuine / avoid counterfeit?
Buy only from authorized or franchised channels. On receipt, check: (1) laser-etched markings that solvent will not remove; (2) batch / lot code consistent between label and device; (3) original reel or tube packaging; (4) request traceability documents (CoC, date code). For critical parts, third-party X-ray / decapsulation testing is recommended.
How do I read the markings / date code on a chip?
Most active ICs use a 4-digit date code YYWW (year + week, e.g. 2345 = 2023 week 45). The top mark is manufacturer logo + base part number + lot code. For SMD code lookup, search by "marking code + package" on AllDataSheet / Octopart / LCSC.
What does the package code mean (TO-220, SOT-23, QFP…)?
Package codes describe the physical form factor and pin layout — critical when sourcing, because electrically equivalent parts in different packages will not fit the PCB. Common: TO-220 (3-terminal power), SOT-23 (3-pin small signal), DIP / SOIC (through-hole / SMD ICs), QFP / QFN (MCUs, processors).
What if my original model is discontinued (EOL / NRND)?
Three options: (1) the manufacturer’s recommended replacement; (2) franchised distributor legacy stock; (3) a functionally compatible cross-brand part — provided pinout and key parameters match. Always evaluate on a real board before mass swap.
What is the minimum order quantity (MOQ) and lead time?
We support both sample and volume orders. Minimum order quantity, stock availability and lead time are confirmed per inquiry — tell us your model and quantity and we will quote. Sample quantities for design validation are supported.
Can I get the datasheet and samples?
The full datasheet is linked on this page. For parts without a direct datasheet, we can locate the manufacturer document on request. Sample requests are supported — contact us with your model and quantity.
Request confirmation of current stock, date code, packaging, price and delivery terms. Product information does not constitute a binding offer; final specifications are confirmed with your quotation.