PCA9545APW Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
PCA9545APW is a 4-channel I2C bus switch with interrupt logic from Texas Instruments. Features active-low enable inputs and bus voltage level translation. From $0.61, in stock, worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- PCA9545APW Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.6057(MOQ 1)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of PCA9545APW?
- 4-channel I2C/SMBus bus switch with individual channel enable control
- Supports voltage level translation between 1.8V, 2.5V, 3.3V, and 5V bus segments
- Active-low interrupt output aggregates interrupt signals from downstream channels
- TSSOP-20 package enables compact board layout in space-constrained designs
What is PCA9545APW used for?
The PCA9545APW is widely used in server and embedded systems to expand I2C bus capacity by isolating multiple downstream segments. It is ideal for multi-sensor platforms, display controllers, and EEPROM arrays where address conflicts must be resolved. The device also suits hot-swap backplane designs and industrial control systems requiring robust bus segmentation.
What are the specifications of PCA9545APW?
| Pbfree Code | Yes |
| YTEOL | 0 |
| ## PCA9545APW Alternates Showing results | Image |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
Where can I find the PCA9545APW datasheet?
PCA9545APW Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for PCA9545APW?
Compatible alternatives and drop-in replacements for PCA9545APW:
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Frequently Asked Questions
What is the PCA9545APW and what does it do?
The PCA9545APW is a 4-channel I2C bus switch from Texas Instruments in a TSSOP-20 package. It allows a single master to communicate with up to four separate downstream I2C bus segments, enabling address conflict resolution and bus isolation in complex system designs.
What supply voltage does the PCA9545APW support?
The PCA9545APW operates from a supply voltage range of 1.65V to 5.5V, supporting standard logic levels of 1.8V, 2.5V, 3.3V, and 5V. This wide range makes it compatible with mixed-voltage systems and modern low-power microcontrollers.
Can the PCA9545APW handle interrupts from downstream devices?
Yes. The PCA9545APW features four active-low interrupt input pins (INT0–INT3) that are logically OR'd and reported to the master through a single interrupt output pin, simplifying interrupt management across multiple downstream I2C bus segments.
What are common alternatives to the PCA9545APW?
Common alternatives include the PCA9546A (also 4-channel, similar pinout), TCA9545A (compatible drop-in), and PCA9548A (8-channel I2C switch for larger designs). All are from Texas Instruments and share similar I2C bus switching functionality with minor differences in channel count or voltage range.
What package does the PCA9545APW come in and where can I buy it?
The PCA9545APW is available in a TSSOP-20 package (PW suffix). It is stocked by major distributors including Digi-Key, Mouser, and Arrow. Pricing starts at approximately $0.61 per unit at volume, with worldwide shipping available through FindMyChip.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.6057 | $0.61 |
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