Fake or misrepresented Sanken 2SC2922 power transistors have been documented. A convincing label or a normal diode-test reading is not proof that the device can handle an audio amplifier’s voltage, current, heat, or safe-operating area. The reliable approach is layered: preserve evidence, verify the supply chain, compare package and markings, perform controlled electrical tests, and use laboratory or destructive inspection only when the stakes justify it.
What a 2SC2922 is—and what the marking does not prove
The 2SC2922 is a high-power NPN bipolar transistor associated with Sanken audio-amplifier output stages. It is commonly paired with the complementary PNP 2SA1216. A device carrying “2SC2922” may be a genuine Sanken part, a legitimate equivalent from another manufacturer, a relabeled transistor, a salvaged or refurbished component, a genuine but damaged device, or a counterfeit Sanken-branded part.
Counterfeit examples have been reported with substantially smaller internal dies than genuine comparison samples, leaving them unable to dissipate the power expected of the original device. See the documented comparison at Elliott Sound Products. Toshiba’s general counterfeit warning explains why an apparently functional semiconductor can still fail to meet specifications and create equipment or safety problems: Toshiba counterfeit-goods warning.
Why a fake can damage an amplifier
A suspect transistor may work at low volume or pass a quick bench check, then fail under load. An undersized or incorrect die can cause:
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- 2SA1216 A1216 2SC2922 C2922 High-power transistor and original (5 pairs 2SA1216 = 2Pcs 2SC2922 = 2Pcs)
- excessive heating and gain collapse at high current;
- secondary breakdown or thermal runaway;
- oscillation, distortion, or unstable bias;
- failure of output transistors, drivers, emitter resistors, fuses, power-supply parts, or speakers.
“It passes a continuity test” means only that the junctions are not obviously open or shorted. It does not establish manufacturer identity or safe operating capability.
Preserve evidence before touching the parts
- Photograph each transistor from the front, rear, sides, leads, and mounting face.
- Photograph bags, boxes, labels, date codes, lot codes, and seller markings.
- Record the seller, purchase date, listing text, claimed manufacturer, quantity, and whether parts were sold as a matched set.
- Keep parts from different lots separated.
- Do not sand, scrape, polish, or solvent-clean the markings before documenting them; those actions can destroy evidence needed for a return or dispute.
Start with the purchase channel
Supply-chain evidence is usually stronger than appearance. Prefer Sanken or an identified representative, established authorized distributors, or specialist suppliers that provide traceability and a return policy. Request original packaging, lot information, an invoice, and confirmation of the claimed manufacturer.
Increase your risk assessment for untraceable “new old stock,” unusually low prices, mixed loose parts, stock photographs, large quantities of obsolete devices, unsupported claims such as “100% genuine Japan,” or supposedly matched pairs with visibly different packages. Do not infer counterfeiting from a seller’s country alone.
Compare markings side by side
Inspect several samples together under consistent lighting. Reported comparisons describe suspected fakes with brighter or easier-to-read marks, different character thickness or size, unusual alignment, an implausible production-run mark, and surface texture suggesting sanding or repainting. Elliott Sound Products reports that genuine samples in one comparison had thicker, smaller lettering and a production-run number below the part number, while the suspect part differed in package size and marking appearance: Sanken 2SA1216/2SC2922 comparison.
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Gain-grade suffix
Enthusiast reports commonly cite O, Y, P, or G as gain-ranking letters for this family. Treat a missing or unexpected suffix as a warning, not a verdict. Confirm the exact marking convention against documentation for the relevant production era and source; a copied suffix is easy to reproduce. The field report is documented in this diyAudio discussion.
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Signs of re-marking
- Different sheen around the text or a rectangular resurfaced patch;
- sanding scratches, paint residue, discoloration, or uneven mark depth;
- a part number engraved over an earlier designation.
Such signs make a part suspect but do not identify the exact failure mode. Field reports describe sanding and re-marking practices at Mikrocontroller.net. Avoid casual acetone testing: it can damage legitimate markings and erase return evidence. Marking permanence is only one element of a broader screening program, as outlined in IPC counterfeit-part guidance.
Inspect package geometry and finish
Use calipers and a known-good comparison where possible. Check body width, height, metal-tab thickness, mounting features, lead spacing and forming, corner radius, symmetry, and the ratio of molded body to metal plate. One published comparison found the genuine package approximately 0.5 mm larger on each edge with slightly rounder corners; that is a measurement from those samples, not a universal tolerance.
The same comparison described a slightly frosted or matte rear plate on the genuine sample and a shinier surface on the suspect one. Finish can vary with production, storage, polishing, oxidation, or handling, so it is only corroborating evidence.
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On a clean, genuinely flat reference, check whether the rear plate rocks or rotates excessively. Dirt, bent leads, burrs, or mounting damage can produce the same symptom; never force the package flat. Small depressions or mold letters may vary by package version. Compare multiple verified parts from the same period rather than relying on an online photograph.
Use a multimeter for screening, not authentication
- Remove the transistor from the circuit and verify the correct package pinout using applicable manufacturer documentation or a known-good sample.
- With a current-limited diode-test function, check base-emitter and base-collector junctions in the expected direction.
- Check that collector-emitter does not show an unexpected short.
- Record readings and compare with a known-good complementary-set device.
This can reveal a wrong transistor, open junction, or short. It cannot reveal die size, safe operating area, thermal resistance, high-current gain, breakdown performance, switching behavior, or manufacturer identity. A component identifier that reports hFE at a few milliamps is not an authenticity certificate.
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Test current-dependent behavior safely
For experienced technicians, use a fused, current-limited fixture rather than an amplifier. Measure collector current, base current, collector-emitter voltage, and case temperature. Begin at low power, increase current gradually, and stop for instability, abnormal heating, excessive voltage drop, or gain collapse. Compare a suspect and known-good device under identical conditions.
hFE depends on collector current, voltage, temperature, pulse duration, gain grade, and measurement method. A plausible low-current reading can coexist with failure at the current demanded by an output stage. More complete characterization may include leakage versus temperature, breakdown voltage, saturation, safe operating area, power dissipation, thermal response, and complementary-device matching. Do not wire an unverified part into a valuable amplifier “to see what happens.”
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Weight and internal inspection
Weight is supporting information only. Package revisions, leads, solder, surface treatment, and added material can change it; reported samples had similar weights despite other construction differences (diyAudio sample comparison).
Decapsulation can reveal die dimensions, bond-wire count and attachment, die placement, and package workmanship. A cited 2SC2922 comparison found a much smaller die in the suspect sample (Elliott Sound Products). Opening the device destroys it and still requires an authoritative reference; a different construction may be a legitimate later or licensed design. For valuable batches, professional services can combine X-ray, acoustic microscopy, optical inspection, decapsulation, and electrical characterization.
What to do with suspect parts
- Stop installation and preserve photographs, packaging, and test records.
- Contact the seller before altering the devices; request a refund or documented return authorization.
- Report repeated counterfeit activity to the marketplace or distributor.
- Use traceable parts or a documented substitute for high-value restorations and safety-critical equipment.
- Do not resell suspect devices as genuine.
If one device in a complementary pair is suspect, check both devices, gain and leakage matching, drivers, emitter resistors, bias circuitry, insulation hardware, and oscillation. A fake may already have stressed surrounding components.
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Buyer’s checklist
- Is the source authorized or traceable?
- Are original packaging and lot/date information present?
- Do markings, suffixes, dimensions, corners, leads, and rear finish match the comparison sample?
- Is there any sanding, repainting, or re-engraving?
- Do junction tests match a known-good device?
- Has controlled high-current testing passed without abnormal heat or gain collapse?
- Is a practical return path available?
Choosing tools for verification
A quality multimeter, current-limited bench supply, microscope, and calipers support screening; a curve tracer or professional laboratory is appropriate for high-value batches. Potential manufacturer or distributor homepages include Fluke, Keysight, Tektronix, DigiKey, and Mouser. Their current 2SC2922 stock, authorization, and pricing must be checked for the exact part.
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Can a multimeter identify a fake 2SC2922?
No. It can find obvious shorts, opens, and implausible junction behavior, but not provenance, die size, safe operating area, or high-current capability.
Does a missing gain suffix prove a counterfeit?
No. Treat it as a warning and verify the marking convention for the relevant production version.
Does a shiny rear plate prove a fake?
No. It is a reported comparison clue that gains weight only when combined with other differences.
Can weight authenticate the transistor?
No. Package revisions and construction differences make weight supporting evidence at most.
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Can a counterfeit still work?
Yes. It may pass low-power tests yet fail under amplifier current, heat, or voltage.
Should I test it in my amplifier?
No. Use a fused, current-limited fixture; an amplifier is not a controlled authentication bench.
Is a legitimate equivalent the same as an original Sanken part?
No. It may be a safe replacement when its specifications and provenance are documented, but it must not be represented as original Sanken production.
Should both devices in a complementary pair be replaced?
Often they should be evaluated together, including gain, leakage, drivers, bias circuitry, and emitter resistors; replacement depends on measured condition and the amplifier design.
The Bottom Line
Use “suspect” until evidence supports a more specific conclusion. The safest replacement is a traceable part whose electrical behavior is verified in a controlled test fixture—not an anonymous transistor that merely looks right or passes a diode check.
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