TE Connectivity Laird B4303 RF Antenna Equivalent & Substitute Parts

Part Overview

The TE Connectivity Laird B4303 is a 440MHz whip straight RF antenna with NMO base mount termination, designed for UHF applications in the 430MHz to 450MHz frequency band. This component delivers 3dBi gain with a VSWR of 2 and is mounted vertically with a maximum height of 14.000 inches (355.60mm).

The B4303 is classified as obsolete. Locating equivalent or substitute parts is necessary to support ongoing system maintenance, repair, and new design implementations where this antenna specification remains applicable.

Substiute Parts

B4303

TE Connectivity LairdIn Stock: 990B4303 Datasheet

Current PartRFQ

B4303S

TE Connectivity LairdIn Stock: 1144B4303S Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the B4303 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Frequency Range: 430MHz ~ 450MHz
• Antenna Type: Whip, Straight
• Termination: NMO
• Mounting Type: Base Mount
• Gain: 3dBi
• VSWR: 2
• Frequency Group: UHF (300MHz ~ 1GHz)

Allowable Variations:

• Center Frequency: May shift within the 430MHz ~ 450MHz band
• Height (Max): Physical dimensions may vary while maintaining functional equivalence
• Product Status: Active parts are preferred over obsolete classifications
• Packaging: Bulk or standard packaging formats are acceptable

The B4303S meets all mandatory matching parameters and operates within the identical frequency range with equivalent electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

B4303S as Primary Substitute:

The B4303S is the direct substitute for the B4303. Both parts are manufactured by TE Connectivity Laird and share identical electrical specifications across all critical parameters: frequency range (430MHz ~ 450MHz), antenna type (whip, straight), gain (3dBi), VSWR (2), NMO termination, and base mount configuration.

The B4303S holds Active product status, ensuring ongoing availability and supply chain continuity. Both parts maintain RoHS compliance and MSL Level 1 rating, confirming equivalent environmental and handling characteristics.

The primary difference is physical height: the B4303S measures 23.000 inches (584.20mm) compared to the B4303 at 14.000 inches (355.60mm). This dimensional variation must be evaluated against mechanical installation constraints in the target application. The increased height of the B4303S does not alter electrical performance within the specified frequency band.

Selection of the B4303S is appropriate for applications requiring the specified UHF antenna performance in the 430MHz ~ 450MHz band where the increased physical height is accommodated by system design.

Frequently Asked Questions (FAQ)

Q: Can the B4303S replace the B4303 in all applications?

A: The B4303S provides electrical equivalence across all specified parameters. Physical installation compatibility must be confirmed, as the B4303S height is 9.000 inches (228.60mm) greater than the B4303. Verify that mounting location and clearance requirements accommodate the taller antenna profile.

Q: What is the significance of the center frequency difference (440MHz vs. 430MHz)?

A: Both parts operate across the identical frequency range of 430MHz ~ 450MHz. The center frequency designation indicates the design optimization point within this band. Both antennas deliver 3dBi gain and VSWR of 2 across the full band. The center frequency difference does not affect functional substitution.

Q: Why is the B4303 classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The B4303S, with Active status, is the current production equivalent and is recommended for new designs and ongoing support.

Q: Are there compliance differences between B4303 and B4303S?

A: Both parts are RoHS compliant and carry MSL Level 1 rating. ECCN and HTSUS classifications differ due to packaging and regulatory categorization, but environmental and handling compliance is equivalent.

Q: What packaging options are available?

A: The B4303 is supplied in standard packaging. The B4303S is available in Bulk packaging format. Confirm packaging requirements with procurement specifications.

Q: Is the NMO termination standard across both parts?

A: Yes. Both the B4303 and B4303S use NMO base mount termination, ensuring mechanical and electrical compatibility with NMO-equipped RF systems.