Molex 0734040430 SMB Coaxial Connector - Equivalent & Substitute Parts

Part Overview

The Molex 0734040430 is an SMB connector plug with female socket configuration, designed for 75 ohm RF applications. This right-angle solder-terminated connector operates at frequencies up to 4 GHz and is rated for -55°C to 155°C. The part is currently active in production with 990 units in stock. Equivalent parts are identified when they maintain compatibility across critical electrical and mechanical parameters while potentially offering different impedance specifications or operating ranges suited to alternative system requirements.

Substiute Parts

0734040430

MolexIn Stock: 10890734040430 Datasheet

Current PartRFQ

903-367P-51A2

Amphenol RFIn Stock: 997903-367P-51A2 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 0734040430 is determined by the following critical parameters:

Mechanical Compatibility:

• Connector style must be SMB
• Connector type must be Plug, Female Socket
• Mounting configuration must be Free Hanging (In-Line), Right Angle
• Contact termination must be Solder
• Fastening type must be Snap-On
• Number of ports must be 1

Electrical Compatibility:

• Frequency rating must support up to 4 GHz minimum
• Impedance may differ (50 Ohm or 75 Ohm variants are acceptable for different circuit requirements)
• Operating temperature range should encompass or exceed -55°C to 155°C
• Voltage rating must meet or exceed 335 V

Regulatory & Quality:

• RoHS3 compliance required
• Product status must be Active

The Amphenol RF 903-367P-51A2 meets all mechanical and electrical compatibility criteria, with the primary difference being impedance specification (50 Ohms versus 75 Ohms) and dielectric material composition.

Parameter Comparison

Engineering Selection Recommendations

Both the Molex 0734040430 and Amphenol RF 903-367P-51A2 are active production parts with ROHS3 compliance and MSL Level 1 ratings, making them suitable for industrial and commercial applications.

Molex 0734040430 Selection Criteria:

• Required for 75 ohm impedance systems
• Lower insertion loss specification (0.2 dB) preferred for signal integrity-critical applications
• Operating temperature range of -55°C to 155°C sufficient for specified environment
• Polypropylene dielectric material composition

Amphenol RF 903-367P-51A2 Selection Criteria:

• Required for 50 ohm impedance systems
• Extended operating temperature range (-65°C to 165°C) for extreme environment applications
• Polytetrafluoroethylene (PTFE) dielectric material for enhanced RF performance stability
• Higher insertion loss (0.6 dB) acceptable in applications where impedance specification takes priority

Selection between these parts is determined by system impedance requirement (50 Ohm or 75 Ohm) and environmental operating conditions. Both parts share identical mechanical form factor, mating cycle rating, and regulatory compliance status.

Frequently Asked Questions (FAQ)

Q: Can the Amphenol RF 903-367P-51A2 be used as a direct replacement for the Molex 0734040430?

A: Physical and mechanical compatibility is confirmed. However, impedance differs (50 Ohms versus 75 Ohms). Substitution is valid only if the circuit design accommodates 50 ohm impedance. Impedance mismatch in RF systems results in signal reflection and performance degradation.

Q: What is the difference in insertion loss between these connectors?

A: The Molex 0734040430 specifies 0.2 dB insertion loss, while the Amphenol RF 903-367P-51A2 specifies 0.6 dB. This difference is attributable to dielectric material composition (Polypropylene versus PTFE) and impedance specification. Selection depends on signal attenuation tolerance in the application.

Q: Are both parts suitable for high-temperature applications?

A: The Molex 0734040430 operates from -55°C to 155°C. The Amphenol RF 903-367P-51A2 extends this range to -65°C to 165°C. For applications exceeding 155°C, the Amphenol part is required.

Q: Do these connectors require different cable types?

A: The Molex 0734040430 is specified for RG-179 cable group. The Amphenol RF 903-367P-51A2 is specified for RG-316 cable group. Cable selection must align with the connector impedance and dielectric specifications.

Q: What is the mating cycle rating for both connectors?

A: Both connectors are rated for 500 mating cycles, indicating equivalent mechanical durability and connector lifespan under normal use conditions.

Q: Are both parts RoHS compliant?

A: Yes, both the Molex 0734040430 and Amphenol RF 903-367P-51A2 are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity ratings, suitable for standard storage and handling conditions.