PCA9545APWR Part Information
Details for PCA9545APWR by Texas Instruments
Electronic & Electrical Components>Semiconductors - ICs>Analogue Multiplexers - MUX / Demultiplexers - DEMUX
Part Description
The PCA9545A is a quad bidirectional translating switch controlled via the I2C bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. Four interrupt inputs (INT3–INT0), one for each of the downstream pairs, are provided. One interrupt (INT) output acts as an AND of the four interrupt inputs. An active-low reset (RESET) input allows the PCA9545A to recover from a situation in which one of the downstream I2C buses is stuck in a low state. Pulling RESET low resets the I2C state machine and causes all the channels to be deselected, as does the internal power-on reset function. The pass gates of the switches are constructed such that the VCC terminal can be used to limit the maximum high voltage, which will be passed by the PCA9545A. This allows the use of different bus voltages on each pair, so that 1.8-V, 2.5-V, or 3.3-V parts can communicate with 5-V parts, without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O terminals are 5.5 V tolerant.
Part Downloads
Download PCB Footprint from Ultra Librarian
Part Specifications
| Multiplexer Configuration | - |
| No. of Circuits | 4Circuits |
| On State Resistance Max | 16ohm |
| Supply Voltage Range | 2.3V to 5.5V |
| Analogue Multiplexer Case | TSSOP |
| No. of Pins | 20Pins |
| Product Range | - |
Alternative Part Descriptions
- ANALOG MULTIPLEXER, QUAD 4 X 1 TSSOP-20; Multiplexer Configuration:-; No. of Circuits:4Circuits; On State Resistance Max:16ohm; Supply Voltage Range:2.3V to 5.5V; Analogue Multiplexer Case:TSSOP; No. of Pins:20Pins; Product Range:- RoHS Compliant: Yes | Newark Electronics
- 4-channel 2.3- to 5.5-V I2C/SMBus switch with interrupt, reset & voltage translation | Texas Instruments
Frequently Asked Questions
Where can I find additional details, specifications and documents for a PCA9545APWR?
Additional datasheets, footprints and schematics for PCA9545APWR are listed in our Part Details tab. You can also find the PCA9545APWR image and similar parts on this details page.
What pricing and inventory information can I view?
Distributor pricing and stock information is available for PCA9545APWR in the Pricing & Inventory tab next to part details. You can view PCA9545APWR price breaks, MOQs, lead times, inventory and SKUs from distributors.
What category does PCA9545APWR fall under?
The PCA9545APWR is listed under Electronic & Electrical Components > Semiconductors - ICs > Analogue Multiplexers - MUX / Demultiplexers - DEMUX.
Can I view similar or alternative parts?
You can view similar parts to PCA9545APWR when available in the Analogue Multiplexers - MUX / Demultiplexers - DEMUX range under the specifications section at the bottom of the details page.
Who can I contact for technical support of the product?
Submit any questions directly to the customer support team of the distributor listing the product. For the PCA9545APWR you can contact the distributor directly for product support, shipping queries etc.
Is the PCA9545APWR RoHS compliant?
Yes. This part has been flagged as RoHS Compliant by Farnell.
Which authorised distributors for PCA9545APWR have stock available?
Authorised distributors including Newark Electronics and Texas Instruments have stock available or on a lead time for PCA9545APWR.
How do I check stock and lead times for all distributors?
Stock availability and lead times will be displayed for PCA9545APWR often in real-time on the comparison pages.
What if I can't find stock of PCA9545APWR?
You can fill out our help required form which you can use to request a quote for PCA9545APWR from some of our verified obsolescence suppliers. Alternatively, contact us via our web chat in the bottom left of your screen and one of our team will try to help.