JAN 2N657 NPN Silicon Transistor, MIL-PRF-19500/74, Hermetic Can, NOS
- 4 photos
Never used. The original pack has been opened, or the quantity was split off a full reel or tube. Leads are original and unclipped.
New old stock, open stock on the grading scaleSend the quantity you need. You get a quote back with shipping before anything is charged.
Video
Filmed on the bench. Sound is stripped from product clips.
- 0:28
Specifications
| Specification | Value |
|---|---|
| Identification | |
| Part number | 2N657 |
| Manufacturer | Not recorded |
| Condition | New old stock, open stock |
| Date code | Not recorded |
| Package | Hermetic three lead metal can |
| Country of origin | Not recorded |
| Family | 2N657 |
| Stock number | DMDAXEHQ |
| Overview | |
| Manufacturer part number | 2N657 |
| Qualification | JAN, MIL-PRF-19500/74 |
| Electrical | |
| Polarity and material | NPN silicon |
| Collector emitter voltage | About 100 V |
| Collector current | About 0.5 A |
| Minimum DC current gain | About 20 |
| Construction | |
| Package | Hermetic three lead metal can |
| Condition | |
| On the shelf | Three |
| Condition | New old stock, open stock. Never installed, never soldered |
| Testing | Sold untested. Ask and the exact piece going in the envelope is metered first |
About this part
The JAN prefix on the case is a qualification, not decoration. It means the device was produced on a line qualified to a United States military performance specification and screened against it, and for this family that specification is MIL-PRF-19500/74. In practice a JAN part came out of a controlled process with documented lot traceability, which is why they were specified for equipment that had to work after being dropped, shipped and stored for years before anyone switched it on.
Electrically the 2N657 is a medium power NPN silicon transistor in the region of 100 volts collector to emitter and half an amp of collector current, with a minimum specified DC gain around 20. That combination, decent voltage with modest current and a hermetic metal can, made it a driver and a series element in equipment where the supply rail was higher than the small signal parts could take.
Three are on the shelf. Each is clearly marked 2N657 with the JAN identification on the opposite face of the can, so both the type and the qualification can be read from the object. Sold individually and sold untested: a JAN screening from decades ago is a statement about how the part was made, not a guarantee about how it measures today.
Questions about this part
What does JAN actually certify?
That the device was built on a line qualified to a United States military performance specification and screened against it, with lot traceability. For this family the document is MIL-PRF-19500/74. It describes how the part was produced and tested at the time, which is a statement about process rather than a warranty about its condition sixty years later.
What is the 2N657 suited to?
Driver stages and series elements on higher rails. Around 100 volts collector to emitter with roughly half an amp of collector current and a hermetic metal can, it handled places where small signal parts would break down and a full power device was unnecessary.
Does JAN qualification mean it is guaranteed good?
No, and anyone telling you otherwise is selling. It means the manufacturing and screening met a standard decades ago. These are sold untested. Ask and we will meter the specific piece before it ships.
Is the JAN marking visible?
Yes. The type number 2N657 is on one face of the can and the JAN identification is on the opposite face, so you can read both from the part itself rather than taking the listing's word for it.