1.04.0075.02000

The 1.04.0075.02000 is a D-Sub, male-pin terminator from the IXXAT CAN 120 series, manufactured by HMS Networks. Categorized under D-Sub, D-Shaped Connector Terminators, this component provides a 120-ohm termination resistor integrated into a 9-pin male connector housing for CAN bus networks. Counterfeit risk in the D-Sub connector channel typically involves substitution of standard pass-through connectors for termination types, use of incorrect resistor values (e.g., 100 ohms instead of 120), or poor-quality tin plating on pins. These verification steps target those specific failure modes.

Visual Marking and Housing Inspection

Authentic HMS Networks units feature laser-etched markings on the metal shell or the connector body. Ink-stamped or pad-printed logos that smear with alcohol swabbing indicate reworked or non-genuine parts. The marking should clearly read "IXXAT CAN 120 TERMINATION MALE" or an HMS incised logo. Examine the jack screw hardware: genuine units use stainless steel captive screws with uniform thread pitch. Loose, magnetic, or misaligned screws often point to salvaged assemblies. The 9-pin male pins must exhibit a bright, uniform gold flash on the contact area; dull, yellowish, or pitted surfaces suggest deficient gold thickness — expected to be below the functional 0.05 μm threshold — or a missing nickel underlayer. For lot code verification, look for a YYWW (year, week) code laser-etched on the shell. For example, code 2435 indicates production week 35 of 2024.

Electrical Parameter Measurement: Resistance, Contact, and Insulation

Validate the core function of the terminator by measuring resistance between the CAN_H and CAN_L pins (typically pins 2 and 7 on a 9-pin D-Sub). A DMM set to ohms should read 120 ohms ± 1% for a precision termination. Readings outside 118.8 to 121.2 ohms suggest an incorrect resistor or a damaged termination network. For contact resistance, use a 4-wire Kelvin low-resistance meter. Measure each male pin to its corresponding test probe. The pass criterion is below 30 milliohms for gold-plated contacts. A reading exceeding 50 milliohms indicates contact degradation, likely from thin plating or oxidation. Insulation resistance between the metal shell and each pin tests with a 500 V DC megohmmeter; accept values above 1000 MΩ. Flashover or values below 100 MΩ signal moisture ingress or conductive contamination, common in salvaged parts stored unprotected.

Interpreting Critical Specs for CAN Bus Reliability

The 120-ohm termination resistance is not arbitrary — it matches the characteristic impedance of standard CAN bus twisted-pair cables. Using a terminator with a 5% resistor instead of 1% can shift the effective bus impedance, causing unterminated reflections that corrupt differential signals at high bit rates (e.g., 1 Mbps). In multi-drop networks with several nodes, even a 2-ohm deviation at the far-end terminator can reduce noise margin. For contact resistance, the 30 mΩ threshold for gold-plated pins ensures that the total loop resistance added by the terminator remains below 100 mΩ — including the internal resistor leads and PCB traces inside the housing. A degraded contact adds series resistance that attenuates the CAN differential voltage, especially at the receiver side of the bus.

The jack screw feature, while mechanical, is critical for industrial fieldbus installations. Vibration from motors or actuators can loosen a friction-fit D-Sub over days, disconnecting bus termination. The captive jack screws provide positive locking to the mating connector. For verification, confirm that the jack screw threads are clean and engage fully without cross-threading. A stripped jack screw renders the terminator unusable in high-vibration environments, even if the electrical path is intact. Pair the visual inspection of the jack screw with the shell-to-pin insulation test — any signs of corrosion around the screw threads warrant rejection.

X-Ray and Decapsulation for High-Value or High-Risk Applications

For CAN bus nodes in safety-critical systems (medical devices, autonomous guided vehicles), consider X-ray inspection of a sample from the lot. The 120-ohm resistor inside the housing must be a metal-film or thick-film type rated for at least 0.25 W. An X-ray reveals if the resistor is a lower-power carbon-composition type or if multiple resistors are present (indicating a non-standard termination network). Decapsulation (chemical removal of the epoxy body) is destructive but confirms the resistor metallurgy. Use this only when visual and electrical checks show anomalies — e.g., resistance correct but intermittent open circuit under vibration — or when verifying first-article samples from a new supplier.

Packaging and Certificate of Conformance (COA) Cross-Check

HMS Networks ships these terminators in anti-static bags with a label containing the full part number, lot code, and quantity. Verify the label matches the part marking. A COA should list the measured termination resistance and contact resistance from the production batch. For lots exceeding 50 pieces, request a COA and compare the recorded contact resistance values against your 30 mΩ limit. Discrepancies between COA values and your own meter readings suggest storage damage or mishandling in the supply chain. Absence of a COA for this product family is a yellow flag — authentic distribution channels provide it on request.

Acceptable Quality Limit (AQL) Sampling Plan

For incoming inspection of 1.04.0075.02000, use AQL level II, normal severity, per ANSI/ASQ Z1.4 (or equivalent ISO 2859-1). Define critical defects (wrong resistance, open pin, shorted pins) at AQL 0.0%, major defects (contact resistance > 30 mΩ, insulation < 1000 MΩ, unreadable marking) at AQL 0.65%, and minor defects (scratched housing, non-uniform gold color) at AQL 1.5%. Sample size code letter for a lot of 150 units is G (sample size 20). Accept on zero critical defects; for major defects, accept with 0 defects, reject with 1 or more. For minor defects, accept with ≤1, reject with 2 or more. Document the termination resistance measurement for each sample; a range wider than ±2% within the sample suggests resistor tolerance issues or lot contamination. Reject the lot if more than one sample has a pin currently misaligned with the connector shell.

Procurement Workflow Summary

1. Receive lot — match packing slip to PO. Verify label: part number, quantity, lot code.
2. Visual inspection — 100% check for laser etching, jack screw integrity, gold pin condition.
3. Electrical sampling (AQL II) — measure termination resistance between pins 2 and 7 (accept 118.8–121.2 Ω). For each sample: 4-wire contact resistance on 3 random pins (accept < 30 mΩ each).
4. Insulation test — sample shell-to-pin at 500 V DC (accept > 1000 MΩ).
5. Lot disposition — accept if AQL thresholds pass. Reject if any critical defect found. Segregate and return non-conforming units.
6. Documentation — file COA or measurement records. Flag any sample with contact resistance exceeding 25 mΩ for retest after 50 mating cycles if used in high-reliability bus.