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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Is my regulator shot? 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 lm78j05ct if the output voltage goes higher than the input. Home Questions Tags Users Unanswered.

I have blown this specific part with the charge from large output decoupling capacitors when the input was shorted.

I’m not sure how you damaged your target.

Jul 9 ’17 at Sign up using Email and Password. The actual circuit is datasheeh one in this question: Jul 10 ’17 at 7: Also they mention short circuit protection. 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?


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

Datasheeg I measure in situ only R or so between the Vout and GND pins on the regulator both ways which is much less than what I would have expected. Post as a guest Name. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

It seems rather unlikely to me that this is the cause.

LM78M05CT Datasheet

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. Post Your Answer Discard By lm78mm05ct “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.

Spehro Pefhany k 4 They’re all pretty similar. The has an emitter follower on the output stage, so you have probably let the smoke out.

Also the relay smells funny. Hence I assumed it wasn’t necessary with their implementation. I suggest proceeding with caution and looking for something else that may have caused what appears to be significant damage.

There also has to be significant current datasheey back both conditions are necessary for damage to occur.

For ICSP, you can add the diode but realize your programmer will have to power whatever is on the back side, or you can select the target’s vdd on some programmers. When I next plugged in the DC cord I got a spark from the ground terminal and there is a black residue from it on the solder mask of the DC plug and immediately unplugged the DC cord.


A Schottky from Vout? Bad news – You probably need the diode. Review of my first ever PCB design for a watering control robot.

Should I have had the DC power connected to the target? For example, your ICSP setup has a ground to earth through the computer if it’s a desktop or many notebook computers. Any other measurements I should make? John Birckhead 4, 4 For now I think I’ll jurryrig a shunt diode on the pins as the board is already made.

For example, the TI datasheet specifically says: Sign up or log in Sign up using Google. For example, reversed power connections. 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.