Amphenol RF SMPM Connectors: 925-169J-51P vs 925-126J-51P
Amphenol RF SMPM Connectors: 925-169J-51P vs 925-126J-51P
The Amphenol RF 925-169J-51P and 925-126J-51P are 50Ω SMPM PCB end-launch connectors supporting frequencies up to 40GHz. Both use a straight jack configuration, but they differ in mating retention: the 925-169J-51P features a smooth bore interface, while the 925-126J-51P uses a full detent interface.
For RF engineers and buyers, the main selection factors are connector retention, mating compatibility, PCB footprint and assembly requirements.
925-169J-51P vs 925-126J-51P Specifications
| Parameter | 925-169J-51P | 925-126J-51P |
|---|---|---|
| Manufacturer | Amphenol RF | Amphenol RF |
| Connector Series | SMPM | SMPM |
| Connector Type | Straight PCB Jack | Straight PCB Jack |
| Impedance | 50Ω | 50Ω |
| Maximum Frequency | 40GHz | 40GHz |
| Detent Type | Smooth Bore | Full Detent |
| Termination | PCB End Launch | PCB End Launch |
| Contact Termination | Solder | Solder |
| Body Material | Brass | Brass |
| Contact Material | Beryllium Copper | Beryllium Copper |
| Body / Contact Finish | Gold / Gold | Gold / Gold |
| Operating Temperature | −65°C to +165°C | −65°C to +165°C |
| Minimum Mating Cycles | 100 | 100 |
| Product Status | Active | Active |
Note: Both connectors are rated up to 40GHz, but this does not mean their assembled RF performance is identical. PCB layout, mating connector and launch geometry should be verified separately.
Smooth Bore vs Full Detent: What Is the Difference?
925-169J-51P – Smooth Bore: The smooth bore interface has no internal retention undercut. It is generally preferred where easier connection and disconnection are important, including accessible RF test assemblies and serviceable modules.
925-126J-51P – Full Detent: The full detent design includes a retention undercut that engages the mating connector. It is suitable for assemblies requiring more secure mechanical engagement.
Neither connector should be selected based on detent type alone. Engineers should confirm the actual mating and unmating forces, mating plug configuration and mechanical loading requirements using the manufacturer's drawings.
PCB End-Launch Design Considerations
Both models use an end-launch configuration for high-frequency PCB connections. At frequencies approaching 40GHz, the PCB transition can significantly influence insertion loss and return loss.
Before finalizing the design, verify:
PCB footprint: Compare the latest manufacturer drawings, board-edge cutouts and solder pad dimensions.
RF transmission line: Maintain a controlled 50Ω transition appropriate for the selected PCB stack-up.
Grounding: Review the ground connection and nearby via arrangement to minimize discontinuities.
Mating interface: Confirm the compatible SMPM plug or bullet adapter and its detent requirements.
Assembly: Check soldering, mechanical alignment and connector clearance.
Although both models are SMPM end-launch connectors, direct footprint interchangeability should not be assumed without comparing their current customer drawings.
Which SMPM Connector Should You Choose?
| Application Requirement | Suggested Model |
|---|---|
| Easier manual mating and unmating | 925-169J-51P (Smooth Bore) |
| Higher mechanical retention requirement | 925-126J-51P (Full Detent) |
| 40GHz RF PCB interface | Either, subject to RF and PCB validation |
| Replacement of an existing SMPM jack | Verify detent, mating plug and PCB dimensions first |
Can 925-169J-51P Replace 925-126J-51P?
Not automatically. Both connectors share a 50Ω SMPM interface and a 40GHz maximum frequency rating, but their mechanical retention characteristics differ.
Before considering a replacement, compare the manufacturer drawings and confirm mating compatibility, retention requirements, PCB mounting dimensions and RF performance in the intended assembly.
Typical Applications
Microwave and millimeter-wave RF modules
Radar and wireless communication equipment
RF test and measurement systems
Compact board-to-board RF interconnections
High-frequency PCB signal interfaces
Manufacturer Datasheets and Drawings
Official Amphenol RF product information:
Both manufacturer pages provide access to customer drawings and related technical resources. Review the latest drawing revision before PCB fabrication.
925-169J-51P and 925-126J-51P Pricing & RFQ
Looking for Amphenol RF 925-169J-51P or 925-126J-51P pricing, availability or a compatible SMPM connector?
Contact DataStorageIC with your required part number, quantity, mating connector and PCB application details. We can assist with product sourcing, quotation requests and specification confirmation.
