I'm trying to make a bipolar H-Bridge motor driver. But instead of the mentioned diode(1N4001), I've got a 1N4007 diode. Can I use that instead?
Electronic – 1N4007 comparable with 1N4001 diode
diodesh-bridge
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From the datasheet:
This is saying the junction temperature will rise 100 K per watt dissipated. The case temperature will be somewhat less than this, but this datasheet doesn't break out the junction-to-case thermal resistance separately, only the junction-to-ambient.
A change of one K is the same as one degree C, so you will see both units used for this spec.
When you are dissipating that 0.42 W at room temperature, the junction is about 25 + (100 * 0.42) = 67 C. If we guess that the case temperature is halfway between junction and ambient, that would be about 46 C, or 115 degrees Fahrenheit. Does that sound about right?
The 1N4001 diode is considered a general purpose rectifier. It's in a family along which includes the 1N4001 through 1N4007 diodes.
I have never heard of (and cannot find) a 1N4008.
You should look at the datasheet for these diodes to determine if you can substitute them safely.
The main difference is in the maximum ratings:
You will have to make the determination of what constitutes an acceptable replacement because we do not know the characteristics of your device.
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Best Answer
Yes. The 1N4007 can withstand a higher reverse voltage(\$V_r\$), 1000V vs. 50V. The 1N4007 may even be a better choice, esp. if your motor is powered by a voltage near 35V. (The 1N4001 is rated for a \$V_{r(RMS)}\$ of 35V.)
While diodes like 1N400x may be well suited as freewheeling diodes in terms of voltage and current (rated at 1A), they're not exactly fast. To protect your transistors Schottky diodes would be a better choice, but they usually have limited \$V_r\$.
Here's the \$V_r\$ for the 1N400x series: