0770 R Transistor, Three Lead Moulded Package, SD775 Stock, NOS
- 3 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.
- 0:05
Specifications
| Specification | Value |
|---|---|
| Identification | |
| Part number | 0770 R |
| Manufacturer | Not recorded |
| Condition | New old stock, open stock |
| Date code | Not recorded |
| Package | Three lead black moulded package |
| Country of origin | Not recorded |
| Family | NSD771 and SD775 stock group |
| Stock number | DDNNN95A |
| Overview | |
| Case marking | 0770 R |
| Inventory label | SD775 and NSD771, from the bag it arrived in |
| Manufacturer | Unmarked. See the description |
| Construction | |
| Package | Three lead black moulded |
| Condition | |
| Leads | Full length, some oxidation from storage |
| On the shelf | One |
| 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
Marked 0770 R, filed under SD775 and NSD771 by whoever owned it before. The same open question applies here as to its shelf mate: we cannot demonstrate from the object that the marking on the package and the number on the bag describe the same device, so both appear and neither is presented as settled.
There is a reason old stock throws up this problem so often. House numbering was ordinary practice: a manufacturer building equipment in volume would order a standard device screened to its own limits and have it marked with an internal number, so the part that came off the line carried a code that meant something inside one company and nothing outside it. Decades later the bag says one thing, the part says another, and both are telling the truth about different stages of the same journey.
One is on the shelf. Three leads, black moulded body, full length leads, some lead oxidation and light storage marking of the kind that cleans off with a fibreglass pen and fresh flux. Never fitted. Good for restoration work where the marking matches what you are after, for research, or for a collection of early moulded package devices. Verify pinout and behaviour before it goes into a circuit.
Questions about this part
Why would a part be marked differently from the bag it lived in?
House numbering. A manufacturer buying in volume would take a standard device, screen it to its own limits and have it marked with an internal code. That code meant something inside that company and nothing outside it. Decades later the bag and the part disagree, and both are accurate about different stages of the same part's life.
Will the lead oxidation stop it soldering?
No, but clean it first. A fibreglass abrasive pen and fresh active flux takes the dullness off and the solder wets normally. Trying to solder through decades of oxide is what produces a dry joint you then chase for an hour.
Is this the same device as the 0771 T in the next listing?
Unknown, and treated as separate stock with a separate count. The markings differ by one character and they came out of the same inventory group, which is suggestive and is not proof. We list what each one says.
Would you recommend this for a working repair?
Only if the marking matches what your equipment or documentation calls for. As a substitute chosen from the bag label it is a gamble. Test the pinout and the basic behaviour before it sees a supply rail either way.