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UG-604/U(40) BNC Connector Jack - Equivalent & Substitute Parts
Part Overview
The UG-604/U(40) is a BNC connector jack (female socket) manufactured by Hirose Electric Co Ltd, designed for 50-ohm coaxial applications with panel mount installation via bulkhead rear-side nut. This connector features solder cup termination and operates across a frequency range up to 4 GHz with an operating temperature range of -55°C to 85°C.
The UG-604/U(40) is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or field replacement requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Connector Style | BNC |
| Connector Type | Jack, Female Socket |
| Impedance | 50 Ohms |
| Contact Termination | Solder Cup |
| Shield Termination | Solder |
| Mounting Type | Panel Mount |
| Mounting Feature | Bulkhead - Rear Side Nut |
| Fastening Type | Bayonet Lock |
| Frequency - Max | 4 GHz |
| Number of Ports | 1 |
| Body Material | Brass |
| Dielectric Material | Polytetrafluoroethylene (PTFE) |
| Operating Temperature | -55°C ~ 85°C |
| Mating Cycles | 5000 |
| RoHS Status | RoHS Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the UG-604/U(40) is determined by strict equivalence across the following critical parameters:
- Connector Style: BNC
- Connector Type: Jack, Female Socket
- Impedance: 50 Ohms
- Contact Termination: Solder Cup
- Shield Termination: Solder
- Mounting Type: Panel Mount
- Mounting Feature: Bulkhead - Rear Side Nut
- Fastening Type: Bayonet Lock
- Frequency - Max: 4 GHz
- Number of Ports: 1
- Dielectric Material: Polytetrafluoroethylene (PTFE)
All identified substitute parts meet these core electrical and mechanical parameters. Variations in secondary parameters such as center contact material, body finish, operating temperature range, mating cycles, and compliance certifications are noted in the comparison table below and must be evaluated against specific application requirements.
Parameter Comparison
| Parameter | UG-604/U(40) (Hirose) |
UG-625/U(40) (Hirose) |
UG-657/U(40) (Hirose) |
031-3376 (Amphenol RF) |
RFB-1116-3 (RF Industries) |
|---|---|---|---|---|---|
| Connector Style | BNC | BNC | BNC | BNC | BNC |
| Connector Type | Jack, Female Socket | Jack, Female Socket | Jack, Female Socket | Jack, Female Socket | Jack, Female Socket |
| Impedance | 50 Ohms | 50 Ohms | 50 Ohms | 50 Ohms | 50 Ohms |
| Contact Termination | Solder Cup | Solder Cup | Solder Cup | Solder Cup | Solder Cup |
| Shield Termination | Solder | Solder | Solder | Solder | Solder |
| Mounting Type | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount |
| Mounting Feature | Bulkhead - Rear Side Nut | Bulkhead - Rear Side Nut | Bulkhead - Rear Side Nut | Bulkhead - Rear Side Nut | Bulkhead - Rear Side Nut |
| Fastening Type | Bayonet Lock | Bayonet Lock | Bayonet Lock | Bayonet Lock | Bayonet Lock |
| Frequency - Max | 4 GHz | 4 GHz | 4 GHz | 4 GHz | 4 GHz |
| Number of Ports | 1 | 1 | 1 | 1 | 1 |
| Body Material | Brass | Brass | Brass | Brass | Brass |
| Body Finish | Silver | Silver | Silver | Silver | Nickel |
| Center Contact Material | Beryllium Copper | Beryllium Copper | Beryllium Copper | Phosphor Bronze | Phosphor Bronze |
| Center Contact Plating | Silver | Silver | Silver | Gold | Gold |
| Dielectric Material | PTFE | PTFE | PTFE | PTFE | PTFE |
| Operating Temperature | -55°C ~ 85°C | -55°C ~ 85°C | -55°C ~ 85°C | -65°C ~ 165°C | Not Specified |
| Mating Cycles | 5000 | 5000 | 1000 | 500 | Not Specified |
| Voltage Rating | Not Specified | Not Specified | Not Specified | 500 V | 500 V |
| Insertion Loss | Not Specified | Not Specified | Not Specified | 0.2 dB | Not Specified |
| Product Status | Obsolete | Active | Active | Active | Active |
| RoHS Status | RoHS Compliant | RoHS Compliant | RoHS Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
All four substitute parts—UG-625/U(40), UG-657/U(40), 031-3376, and RFB-1116-3—satisfy the core electrical and mechanical requirements for direct substitution with the obsolete UG-604/U(40).
UG-625/U(40) and UG-657/U(40) are Hirose Electric Co Ltd products with active product status. UG-625/U(40) maintains identical specifications to the original part, including 5000 mating cycles and beryllium copper center contacts with silver plating. UG-657/U(40) is also active but specifies 1000 mating cycles, which is lower than the original specification.
031-3376 (Amphenol RF) and RFB-1116-3 (RF Industries) are active products with ROHS3 compliance. Both feature phosphor bronze center contacts with gold plating and 500 V voltage rating specifications. The 031-3376 specifies an extended operating temperature range of -65°C to 165°C and 500 mating cycles with 0.2 dB insertion loss. RFB-1116-3 features nickel body finish rather than silver.
Selection should prioritize UG-625/U(40) for direct replacement when Hirose sourcing is preferred and mating cycle requirements match the original 5000-cycle specification. Alternative manufacturers (Amphenol RF and RF Industries) provide viable options where multi-source qualification or extended temperature performance is required.
Frequently Asked Questions (FAQ)
Q: Can UG-657/U(40) be used as a direct replacement for UG-604/U(40)?
A: UG-657/U(40) meets all core electrical and mechanical parameters. However, it specifies 1000 mating cycles compared to the original 5000 mating cycles. Applications requiring higher mating cycle durability should use UG-625/U(40) instead.
Q: What is the difference between the Hirose and Amphenol RF versions?
A: Both meet the 50-ohm BNC jack specification with identical mounting and termination. Key differences include center contact material (beryllium copper vs. phosphor bronze), plating (silver vs. gold), and operating temperature range. The Amphenol 031-3376 specifies -65°C to 165°C versus -55°C to 85°C for Hirose parts, and includes documented insertion loss of 0.2 dB.
Q: Does RFB-1116-3 have the same performance as the original UG-604/U(40)?
A: RFB-1116-3 meets all core electrical and mechanical requirements. It features nickel body finish instead of silver and gold-plated center contacts. Mating cycle and operating temperature specifications are not provided for this part.
Q: Are all substitute parts RoHS compliant?
A: Yes. UG-625/U(40) and UG-657/U(40) are RoHS Compliant. 031-3376 and RFB-1116-3 are ROHS3 Compliant, which represents a more recent compliance standard.
Q: Which substitute part should be selected for new designs?
A: UG-625/U(40) is recommended for new designs requiring Hirose sourcing with full specification alignment. For multi-source qualification or extended temperature requirements, 031-3376 (Amphenol RF) provides an alternative with documented performance metrics.
Q: What packaging options are available?
A: UG-625/U(40) and UG-657/U(40) are supplied in Bulk packaging. 031-3376 is supplied in Bulk packaging. RFB-1116-3 is supplied in Bag packaging.
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