SRCN1A16-7S Circular Connector Assembly Procurement Verification Notes
SRCN1A16-7SThe SRCN1A16-7S from JAE Electronics is a 7-pin, nickel-plated aluminum receptacle with female sockets, solder cup termination, and a threaded coupling mechanism. Classified under Circular Connector Assemblies, this part is widely sourced for industrial cable-to-panel or in-line connections where mechanical retention and silver-plated contacts are specified. Procurement teams must verify marking authenticity, contact resistance, and dielectric integrity upon receipt to avoid shipment of counterfeit, refurbished, or mislabeled units.
Visual and Marking Inspection: Laser Etch vs. Ink Stamp and Date Code Decoding
Authentic JAE SRCN1A16-7S units carry laser-etched markings on the shell barrel. Laser etch appears as shallow, consistent gray characters that cannot be scraped off with a fingernail. In contrast, counterfeit or refurbished parts often use ink stamping, which smudges or flakes under mild abrasion. Inspect the shell for the JAE logo, the part number "SRCN1A16-7S", and a four-digit date code in the format YYWW (year and week of manufacture). For example, "2410" indicates the 10th week of 2024. If the marking is absent, misaligned, or appears repainted, reject the lot. Verify that the nickel shell finish is uniform with no pitting or discoloration that might indicate re-plating of salvaged units.
Parameter Measurement Methods and Pass/Fail Criteria
For a procurement incoming quality check, measure the following parameters with calibrated instruments. Use the table below as a supplier-must-confirm checklist. Record readings for 5% of the lot (minimum 20 units) and compare against the datasheet limits.
| Parameter | Value | Engineering Meaning |
|---|---|---|
| Shell Size - Insert | 16-7 | This parameter indicates the shell diameter (size 16) and insert arrangement code (7). Verify with a go/no-go gauge; mismatches cause improper mating. |
| Contact Resistance (mating pair) | ≤ 10 mΩ (silver contacts) | Typical range for silver-plated contacts is 5–10 mΩ. Readings above 20 mΩ indicate surface oxidation or insufficient contact force. Use a 4-wire Kelvin micro-ohmmeter at 100 mA test current. |
| Insulation Resistance (pin-to-pin, pin-to-shell) | ≥ 1000 MΩ at 500 VDC | Values below 100 MΩ suggest contamination or moisture ingress. Test all adjacent pin pairs with a 500 VDC megohmmeter for 60 seconds. No leakage or breakdown allowed. |
| Dielectric Withstand Voltage | 1500 VAC RMS for 1 minute | Apply between all pins shorted together and shell. No flashover or current exceeding 1 mA is acceptable. This verifies that the insert molding has no voids. |
| Cable Opening Diameter | 0.453 in (11.51 mm) | Specialty parameter — see datasheet. Confirm that the supplied cable clamp accommodates the intended cable O.D. without deformation. |
| Current Rating (per contact) | 10 A | This rating applies at 25°C ambient with all 7 contacts simultaneously carrying current at 70% derating factor. For higher temperatures, apply a 0.6–0.8 multiplier. |
| Operating Temperature Range | -25°C to +85°C | This range reflects the silicone gasket and insert limits. Do not exceed these extremes during reflow or storage. |
| Mating Cycles (rated) | 500 cycles | This is a typical industrial-grade rating. Expect contact resistance to stabilize after 50 cycles and degrade after 500. Frequent unmating may require gold-plated alternatives. |
The two most critical specs for application selection are contact resistance and current derating. Silver contacts offer excellent conductivity but tarnish in sulfurous or high-humidity environments. If the connector is used in a power circuit with 7 A continuous per pin, the total thermal rise at 10 A per pin is already near the 85°C limit. Designers should measure voltage drop across each contact after 100 thermal cycles to detect any resistance creep. The 1500 V AC dielectric withstand test is essential for verifying that the insert has not been cracked during assembly — a common failure in reworked or knock-off units.
X-Ray and Decapsulation for High-Value Applications
For lots destined for defense, aerospace, or critical industrial automation, perform X-ray inspection on three units per batch. Examine the solder cup termination area for voids in the solder fillet or incomplete wire insertion. A gold-standard X-ray image shows a full barrel fill with no sharp voids exceeding 10% of the cross-section. For decapsulation, selectively dissolve the nickel shell using nitric acid (perform in a fume hood by qualified personnel). Inspect the contact base metal: authentic JAE units use a copper alloy under-layer with a silver flash of 0.2–0.5 μm. Counterfeit parts often omit the nickel under-plating or use a silver-plated brass stamping that cracks after 10–20 matings.
Packaging and COA Cross-Check
JAE Electronics ships the SRCN1A16-7S in sealed anti-static bags with a JAE packing slip. The certificate of analysis (COA) must state the lot number, date code, and test results for dielectric withstand and contact resistance. Match the date code on the shell with the COA — mismatches suggest repackaged stock. Each unit should be individually bagged or separated by dividers to prevent contact damage. If the supplier provides a COA without batch-specific data (e.g., generic wording), request a re-test report from the manufacturer. Reject any shipment where the packaging has been opened and re-taped, as this indicates previous handling or tampering.
AQL Sampling Plan with Accept/Reject Criteria
For the SRCN1A16-7S in a procurement context, use ANSI/ASQ Z1.4 (MIL-STD-1916 equivalent) inspection level II, normal severity. For a lot of 100–200 units, sample size 20. Define critical defects as: shell marking illegible or false, contact resistance > 20 mΩ on any pin, insulation resistance < 100 MΩ, or dielectric breakdown. AQL for critical defects: 0 (zero acceptance). For major defects (e.g., cable clamp missing, thread damage, color mismatch): AQL 1.0 (accept on 0, reject on 1). For minor defects (e.g., superficial scratches, slight burrs): AQL 2.5. If the sample fails, reject the entire lot and request a replacement with a new COA. Do not accept partial shipments without re-sampling.
Frequently Asked Questions About SRCN1A16-7S
Frequently Asked Questions About SRCN1A16-7S
What is the SRCN1A16-7S pinout arrangement?
The SRCN1A16-7S uses insert arrangement 16-7 with 7 female sockets in a normal (N) polarization. Consult the manufacturer's layout drawing in the datasheet for the exact cavity numbering, as the orientation key is fixed at position 0° for the N option. The pinout for a mating plug (SRCN2A16-7P) uses the same cavity pattern mirrored.
How do I verify the SRCN1A16-7S contact plating thickness?
Silver plating thickness on genuine JAE units is typically 0.2–0.5 μm. Use an X-ray fluorescence (XRF) analyzer on a sample contact. If the reading is below 0.1 μm or the nickel under-layer is missing, the part is likely counterfeit. For field verification, a simple resistance measurement after 50 cycles on a test fixture will reveal degradation.
Where can I find the SRCN1A16-7S wiring diagram?
The wiring diagram is included in the JAE SRCN series instruction sheet. It shows the solder cup connection method: strip wire to 6 mm, tin the conductor, insert into the cup, and solder at 350°C for 3 seconds. Ensure that no solder bridges to adjacent cups. The diagram also details cable clamp placement and backshell assembly torque specifications.
Does the SRCN1A16-7S require a grommet for cable entry?
Yes, the connector includes a backshell and cable clamp, but a separate grommet or o-ring is recommended for IP67 sealing if required. The standard design provides basic strain relief and environmental protection for industrial indoor use. For outdoor or washdown applications, add a heat-shrink boot over the cable-to-backshell interface and verify the o-ring is seated under the coupling nut.
Procurement Workflow Summary
To secure authentic JAE SRCN1A16-7S parts, follow this workflow: (1) Request a COA with lot-specific test data for contact resistance and dielectric withstand. (2) On receipt, perform visual marking inspection under 10x magnification — accept only laser-etched codes. (3) Measure cable opening diameter with a pin gauge to confirm 0.453 in fit. (4) Run a 4-wire Kelvin measurement on 10% of the lot; reject if any contact exceeds 20 mΩ. (5) For lots above 200 units, commission an XRF check on one sacrificial unit. (6) If any sample fails insulation resistance at 500 VDC, escalate a containment action and return the shipment. This verification approach ensures that the connectors meet the 10 A, 250 VAC rating and withstand 500 mating cycles without latent failures.
For engineers designing cable assemblies with the SRCN1A16-7S, note that the threaded coupling nut requires a torque of 0.5–0.7 N·m. Over-torquing can crack the insert. Always use a torque wrench and turn the coupling nut by hand until the threads engage to avoid cross-threading. When preparing the solder cup, preheat the cup to 260°C before applying solder to ensure a fillet that rises 75% up the cup height. A cold joint here will cause intermittent contact after thermal cycling.
