Order Number LMT, LMT, LMT, LM78M05CT, LM78M12CT or LM78M15CT . be kept below +˚C in order to meet data sheet specifica-. LM78M05CT – Fixed Linear Voltage Regulator, , 3-Terminal, Positive, 10V. Add to compare. Image is for Technical Datasheet: LM78M05CT Datasheet. LM78M05CT datasheet, LM78M05CT pdf, LM78M05CT data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, 3-Terminal A Positive Voltage.

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Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our datashedt terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Jul 10 ’17 at 7: For example, reversed power connections. Should I have had the DC power connected to the target?

Further I measure in situ only R or so between the Vout and GND pins on the regulator both ways which is much ratasheet than what I would have expected. Post as a guest Name. A Schottky from Vout?

I’m not sure how you damaged your target. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. The actual circuit is the one in this question: Desoldered the regulator, all pin combinations with polarity measure within tolerance of a new one and it doesn’t smell.


The has an emitter follower on the output stage, so you have probably let the smoke out.

LM78M05CT Datasheet pdf – 3-Terminal A Positive Voltage Regulator – Fairchild Semiconductor

I’ll have to see how if that affects the rest of my circuit. Sign up using Email and Password. Is it possible the Fairchild LM has a different realisation as the linked data sheet mentions no such shunt diode nor any break down voltages?

There also has to be significant current flowing back both conditions are necessary for damage to occur. At this stage I think my move would be to replace thecheck any diodes for short circuits, power the board from a current-limited PSU and try again measuring the current draw and all supply voltages first!

LM78M05CT Datasheet(PDF) – TI store

But those protections can’t save the chip if it’s abused by putting 10V on the output with input grounded or 50V on the input. Spehro Pefhany k 4 Any other measurements I should make? Bad news – You probably lm8m05ct the diode. John Birckhead 4, 4 For now I think I’ll jurryrig a shunt diode on the pins as the board is already made.


The output voltage has to be greater than the reverse breakdown of the B-E junctions in the regulator to cause damage, and 5V is not. Also the relay smells funny. They’re all pretty similar.

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LM78M05CT Datasheet

I’ve seen some versions of the regulator data sheets where the application notes recommend a diode from Vout to Vin in order to protect the device from burning out if the output voltage goes higher than the input.

That can cause issues if your circuit also has a ground to earth somewhere, and very serious issues if the two are not daatsheet at the same potential.

The programming failed, and the target device has a “electronic” smell not present before. Hence I assumed it wasn’t necessary with their implementation.

It seems lm8m05ct unlikely to me that this is the cause. Is my regulator shot? So my questions are: Email Required, but never shown. Also they mention short circuit protection.