B39431R770U310 Equivalent & Substitute Parts

Part Overview

The B39431R770U310 is a 433.81 MHz Surface Acoustic Wave (SAW) filter manufactured by Qualcomm, designed for general-purpose RF front-end applications. This component features a 1.3 dB insertion loss and is housed in an 8-SMD, No Lead package with a 5.00mm x 5.00mm footprint. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations where this frequency band is required.

Substiute Parts

B39431R770U310

Qualcomm (RF front-end (RFFE) filters)In Stock: 1170B39431R770U310 Datasheet

Current PartRFQ

ASR433.92E-T

Abracon LLCIn Stock: 2030ASR433.92E-T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the B39431R770U310 is determined by the following critical parameters:

Frequency Compatibility: The center frequency of 433.81 MHz defines the primary application band. Substitute parts must operate within the 433 MHz ISM band used for general-purpose RF applications.

Package and Mechanical Compatibility: The 8-SMD, No Lead package with 5.00mm x 5.00mm dimensions and 1.35mm maximum height establishes the physical footprint constraint. Substitute parts must match these dimensions to ensure PCB layout compatibility without redesign.

Mounting Technology: Surface mount technology is required for automated assembly processes. All substitute parts must maintain surface mount compatibility.

Regulatory and Environmental Compliance: RoHS3 compliance and MSL Level 1 rating are mandatory for supply chain and manufacturing process compatibility. REACH unaffected status ensures regulatory alignment.

Electrical Performance: Insertion loss and bandwidth characteristics determine signal integrity in RF front-end circuits. Substitute parts must deliver equivalent or superior performance within the specified frequency band.

Parameter Comparison

Engineering Selection Recommendations

The ASR433.92E-T from Abracon LLC is the identified substitute for the obsolete B39431R770U310. Selection of this alternative is based on the following engineering criteria:

Physical Compatibility: Both parts share identical package dimensions (5.00mm x 5.00mm) and height (1.35mm), enabling direct PCB layout compatibility without redesign.

Frequency Band Alignment: The ASR433.92E-T operates at 433.92 MHz, which falls within the same 433 MHz ISM band as the original part. The 110 kHz frequency offset (0.025% deviation) is within typical application tolerances for general-purpose RF filtering in this band.

Regulatory Compliance: Both parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with current manufacturing and supply chain requirements.

Product Availability: The ASR433.92E-T is classified as active product status with confirmed inventory availability, providing long-term supply security compared to the obsolete B39431R770U310.

Mounting and Assembly: Surface mount technology and 8-SMD, No Lead package format ensure compatibility with existing automated assembly processes.

Frequently Asked Questions (FAQ)

Q: What is the frequency difference between the B39431R770U310 and ASR433.92E-T?

A: The B39431R770U310 operates at 433.81 MHz while the ASR433.92E-T operates at 433.92 MHz. The 110 kHz difference represents a 0.025% frequency offset within the 433 MHz ISM band.

Q: Are the physical packages identical?

A: Yes. Both parts use 8-SMD, No Lead packaging with identical dimensions of 5.00mm x 5.00mm and maximum height of 1.35mm, enabling direct PCB footprint compatibility.

Q: Can the ASR433.92E-T be used as a direct replacement without PCB modification?

A: Yes. The identical package dimensions and surface mount configuration allow direct substitution without PCB layout changes.

Q: What is the insertion loss specification for the ASR433.92E-T?

A: Insertion loss is not specified in the available technical parameters for the ASR433.92E-T. The original B39431R770U310 specifies 1.3 dB insertion loss.

Q: Are both parts RoHS compliant?

A: Yes. Both the B39431R770U310 and ASR433.92E-T are ROHS3 compliant with MSL Level 1 rating.

Q: Why is the B39431R770U310 classified as obsolete?

A: The B39431R770U310 is listed as obsolete by the manufacturer. The ASR433.92E-T is an active product with ongoing availability and support.

Q: What is the operating temperature range for the ASR433.92E-T?

A: The ASR433.92E-T operates across -40°C to 85°C, covering standard industrial and commercial temperature ranges.

Q: Is the ASR433.92E-T available in Tape & Reel packaging?

A: Yes. The ASR433.92E-T is supplied in Tape & Reel (TR) format, suitable for automated pick-and-place assembly processes.