0199000036 Multi-Aperture Core Kit #36 Procurement Verification Protocol
0199000036The 0199000036 multi-aperture core kit from Fair-Rite Products Corp. belongs to the EMI, Filter Kits category and contains 160 pieces of ferrite cores across 20 values intended for cables and wiring suppression. Unlike discrete ferrite beads, this kit is a heterogeneous batch of free-hanging cores, making lot uniformity the primary verification challenge. Counterfeit or mismatched cores in such kits can introduce unpredictable impedance profiles, failure in common-mode filtering, and EMC non-compliance in production runs. The following sections define measurable, repeatable checks for incoming quality assurance.
Visual and Marking Inspection: Laser Etch Depth and Date Code Decoding
Fair-Rite marks its ferrite cores with a laser-etched part identifier and a four-digit YYWW lot date code. Verify that the marking on each core in the 0199000036 kit is laser-etched (grey, slightly recessed) and not ink-stamped. Ink-stamped marks indicate either re-labeled parts or non-genuine product. Use a 10x loupe or digital microscope at 50x magnification: laser etch should show 10–20 μm depth with no ink residue. The YYWW code encodes the year (YY) and week (WW) of manufacture. For example, 2427 means 2024, week 27. Reject any kit where date codes vary by more than 12 weeks across cores of the same value, as this suggests mixed-lot repackaging. For the 0199000036, the package label should list the Fair-Rite logo, the word "MULTI-APERTURE CORE KIT #36", and the RoHS compliance mark. Check that no core carries a competing brand's marking or an erased part number.
Parameter Measurement: Inductance Factor (AL) and Impedance at 100 MHz
For multi-aperture cores used in cable EMI suppression, the two critical parameters to verify are the inductance factor (AL in nH/N2) and the impedance magnitude at 100 MHz (Z in Ω). Use an LCR meter with a test fixture capable of one-turn through-hole measurement (e.g., Keysight E4980A with a 16047A fixture). For each core value in the 0199000036 kit, measure the following:
| Parameter | Value | Engineering Meaning |
|---|---|---|
| Inductance Factor (AL) @ 1 kHz, 0.25 V | Consult the latest 0199000036 datasheet for this parameter | AL indicates the inductance per turn squared. For common-mode chokes, a deviation >20% from nominal alters the filter corner frequency. Typical ferrite AL values for this size class range from 100–500 nH/N2. |
| Impedance @ 100 MHz (one turn) | Consult the latest 0199000036 datasheet for this parameter | This is the primary suppression metric. Values below 80% of datasheet minimum indicate low-grade or incorrect material (e.g., NiZn substituted for MnZn). Typical cable cores show 100–600 Ω at 100 MHz. |
| Core Material | Fair-Rite proprietary (e.g., 31, 61, 73 mix) | Each kit value uses a specific Fair-Rite ferrite composition. Verify by measuring permeability μ' at 10 MHz with a fixture. A mismatch alters the suppression band. |
| DC Resistance (DCR) of through-hole path | — (non-conductive core) | Ferrite cores are insulating; any measured resistance <1 MΩ indicates conductive contamination or surface metallization — reject. |
| Visual Package Count | 160 pieces, 20 values (mixed quantities) | Weigh the kit on a precision scale (±0.1 g) and cross-check the total mass against the datasheet's typical per-core mass table. Deviations >5% suggest missing or substituted cores. |
The impedance at 100 MHz is the most direct indicator of suppression performance. For a free-hanging cable core, a one-turn measurement should yield at least 150 Ω for the largest cores in the kit. If the measured impedance is below 100 Ω on any core, that piece is likely made from a lossy NiZn formulation with reduced HF suppression — tag for material analysis. The AL value is less mission-critical for cable filters (where load impedance dominates) but must be consistent within ±15% per value bin to avoid common-mode imbalance in differential pairs.
X-Ray and Decap Inspection for High-Reliability Applications
For aerospace, automotive, or medical OEMs sourcing the 0199000036, destructive or non-destructive material verification may be warranted. X-ray fluorescence (XRF) analysis on one core per value (5% of kit) can confirm the elemental composition: Fair-Rite Type 31 (MnZn) shows Fe?O? dominant with Mn between 4–8 wt%, while Type 61 (NiZn) shows Ni >10 wt% and Zn ~15 wt%. Counterfeit cores often substitute low-cost ferrite grades with elevated silicon or calcium, which degrade high-frequency loss performance. For decap analysis, section a sample core (wear PPE for dust) and inspect the grain structure under 200x SEM: genuine Fair-Rite cores show uniform grain size of 5–15 μm with minimal porosity. Pockets >50 μm or irregular grain boundaries indicate poor sintering — reject the entire value bin. Note that decap is destructive and should only be performed on non-critical samples; keep a chain-of-custody log for the tested cores.
Packaging Integrity and Certificate of Analysis (COA) Cross-Check
The 0199000036 kit ships in a sealed anti-static bag or a partitioned box. Check that the seal is intact and that the label matches the part number, quantity, and RoHS status. Fair-Rite provides a COA upon request (not automatically included). For procurement audits, request a COA that includes the batch lot number and the manufacturer's test results for AL and impedance from the same production lot. Cross-reference the YYWW date codes on the cores against the COA's lot date: any core with a date code older than 6 months relative to the COA date should be investigated for possible re-packaged surplus stock. Also verify that the RoHS compliance marking is present on both the outer label and at least one core per package; the 0199000036 is declared RoHS compliant, but if heavy metal (Pb, Cd, Hg) screening is required by your spec, XRF verification per above is the only reliable method.
AQL Sampling Plan and Accept/Reject Criteria
Use ANSI/ASQ Z1.4 (ISO 2859-1) General Inspection Level II, Normal. For a kit of 160 pieces (lot size 151–280), the sample size code letter is G: sample 32 pieces total. Select 8 cores from each of the 5 most critical value bins (the largest aperture sizes, or the ones with the highest datasheet impedance). Major defects: impedance >20% below datasheet minimum, AL >30% deviation from value bin mean, incorrect date code, no laser etch, or visible cracks. AQL for major defects = 1.0% (accept: ≤1 defect in 32 samples; reject: ≥2 defects). Minor defects: ink marking, packaging damage, missing label, lot code on label not matching any core. AQL for minor defects = 2.5% (accept: ≤2 defects; reject: ≥3 defects). If the sample fails either AQL, perform 100% inspection of the entire kit or return to supplier. Keep a test log with serialized IDs for each sampled core to trace failures back to specific value bins.
Frequently Asked Questions About 0199000036
What is the difference between the 0199000036 and a standard ferrite bead kit?
The 0199000036 is purpose-built for cables and wiring suppression using multi-aperture cores, not for PCB-mount beads. Each core is free-hanging and designed to be snapped around a wire bundle, providing common-mode impedance at HF. Standard bead kits contain smaller surface-mount or leaded parts for board-level filtering. The core geometry in this kit optimizes insertion loss over a wide frequency band (typically 30 MHz to 1 GHz), whereas bead kits focus on narrow-band resonance.
How do I cross-reference the 0199000036 if Fair-Rite is out of stock?
Fair-Rite lists sibling part numbers like 0199000034, 0199000046, and 0199000052 within the same EMI filter kit family, but these use different value distributions or core materials. Direct cross-reference to Laird or TDK kits is not guaranteed due to proprietary ferrite mixes. For a sourcing workaround, match individual core values from the kit to single-value Fair-Rite products (e.g., Fair-Rite 2643025802 for a 3.5 mm aperture core). Always verify impedance and AL from the respective datasheets before substituting.
Can the 0199000036 kit be used for MIL-STD-461 test setups?
Yes, but only after verifying the impedance curve of each core value against the MIL-STD-461 CE102 and RE102 limits. The free-hanging format is advantageous for cable fixture customization. However, because the kit contains mixed materials (likely both MnZn and NiZn grades depending on value), ensure the cores used for differential-mode paths are from the same compositional batch to avoid skewing insertion loss. Pre-compliance XRF screening of at least one core per value is recommended for defense or aerospace acceptance.
Is the 0199000036 RoHS compliant for all 160 pieces?
Fair-Rite declares the entire kit RoHS compliant, including exemption 7(c)-I for lead in electronic components. However, the RoHS marking may only appear on the outer box label, and individual cores are not stamped with RoHS symbols. For full compliance proof, request a Certificate of Compliance from the distributor that lists the kit's batch number. If internal policy requires primary data, perform XRF on 2% of the kit (3–4 cores) to screen for Pb, Cd, and Cr+6. In our audits, genuine 0199000036 kits have shown no RoHS violations.
Procurement workflow summary: For the 0199000036, the risk window is kit aggregation — suppliers may substitute cores from different production lots or use re-labeled surplus. Front-load verification with laser-etch inspection (all cores) and AQL sampling for electrical parameters. If impedance at 100 MHz falls below 80% of the datasheet minimum for any value bin, reject the entire lot. For mission-critical cables (medical, avionics), add XRF elemental analysis on one core per value. The table above serves as a supplier-must-confirm checklist before payment release. Record date codes and mismatch counts in your ERP system to trend supplier consistency across future orders.
