ATA5745C-PXPW RF Receiver UHF 433MHz Equivalent & Substitute Parts

Part Overview

The ATA5745C-PXPW is an RF receiver module designed for UHF applications operating at 433MHz with ASK and FSK modulation support. This component is classified as obsolete, which necessitates identification of active equivalent parts for continued system design and procurement. The ATA5745C-PXPW delivers -113dBm sensitivity at a maximum data rate of 20kbps, making it suitable for remote keyless entry (RKE), telemetering, and security technology applications. Due to its obsolete status, sourcing active alternatives is essential for new designs and production continuity.

Substiute Parts

ATA5745C-PXPW

Microchip TechnologyIn Stock: 755ATA5745C-PXPW Datasheet

Current PartRFQ

ATA5745C-PXQW-1

Microchip TechnologyIn Stock: 3124ATA5745C-PXQW-1 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The ATA5745C-PXQW-1 qualifies as a direct substitute based on the following critical parameters:

• Frequency Match: Both operate at 433MHz
• Sensitivity Match: Both deliver -113dBm sensitivity
• Data Rate Match: Both support maximum 20kbps
• Package Compatibility: Both use 24-VQFN Exposed Pad surface mount package
• Operating Temperature Range: Both rated -40°C ~ 105°C
• Supply Voltage Compatibility: ATA5745C-PXQW-1 operates within 2.7V ~ 3.3V, which overlaps the primary supply range of the main part
• RoHS Compliance: Both ROHS3 compliant
• Manufacturer: Both manufactured by Microchip Technology

The primary distinction is that ATA5745C-PXPW supports dual supply voltage ranges (2.7V ~ 3.3V and 4.5V ~ 5.5V) while ATA5745C-PXQW-1 operates only within 2.7V ~ 3.3V. Additionally, ATA5745C-PXQW-1 is active production status with higher inventory availability.

Parameter Comparison

Engineering Selection Recommendations

The ATA5745C-PXQW-1 is the appropriate substitute for the obsolete ATA5745C-PXPW based on the following engineering criteria:

Product Status: ATA5745C-PXQW-1 maintains active production status with established supply chain availability (3036 pcs in stock), whereas ATA5745C-PXPW is obsolete with limited remaining inventory (729 pcs).

Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity for new designs.

Electrical Compatibility: The substitute part meets all critical RF performance specifications including frequency, sensitivity, and data rate. The receiving current is marginally lower (6.5mA vs 6.9mA), representing improved power efficiency.

Supply Voltage Consideration: Systems designed for 2.7V ~ 3.3V operation are fully compatible with ATA5745C-PXQW-1. Systems requiring 4.5V ~ 5.5V operation must incorporate appropriate voltage regulation or level shifting to interface with the substitute part.

Packaging and Mounting: Identical 24-VQFN package specifications ensure PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can ATA5745C-PXQW-1 directly replace ATA5745C-PXPW in existing designs?

A: Direct replacement is possible for systems operating within the 2.7V ~ 3.3V supply range. Systems utilizing the 4.5V ~ 5.5V supply range require circuit modification to step down voltage to the substitute part's operating range.

Q: What is the difference in modulation support between these parts?

A: ATA5745C-PXPW supports UHF, ASK, and FSK modulation. ATA5745C-PXQW-1 supports UHF modulation. Designs requiring ASK or FSK modulation must verify protocol compatibility with the substitute part's capabilities.

Q: Are the packages identical?

A: Yes. Both parts use 24-VQFN Exposed Pad surface mount packages with identical footprints, eliminating PCB redesign requirements.

Q: What is the receiving current difference?

A: ATA5745C-PXQW-1 draws 6.5mA versus 6.9mA for ATA5745C-PXPW, representing a 0.4mA reduction in receiving current consumption.

Q: Are both parts RoHS compliant?

A: Yes. Both ATA5745C-PXPW and ATA5745C-PXQW-1 are ROHS3 compliant, meeting environmental and regulatory requirements.

Q: What is the moisture sensitivity level difference?

A: ATA5745C-PXPW has MSL 2 (1 Year), while ATA5745C-PXQW-1 has MSL 3 (168 Hours). This affects storage and handling requirements, with the substitute part requiring more controlled moisture conditions during storage.