1. Can someone tell me what is the meaning of "Maximum forward voltage drop per bridge element at 4.0A dc is 1.1v" in 4 diode bridge rectifier?

Does it mean that there is a voltage drop of 1.1v per diode or total 1.1v voltage drop for all the 4 diodes together?

Please refer this link to page 1

I wanted to know what will be the total voltage drop with this above-mentioned bridge rectifier? I am specifically talking about model number "FL401" in the datasheet.

  1. Also, can someone suggest me right ratings for bridge rectifier? My requirement is as below.

Vin 7~40v AC or DC to bridge rectifier. And for my application, I need 3A current

I have chosen the following ratings. Please correct me whether that is right or wrong.

  1. No. of Phases: Single
  2. Repetitive Reverse Voltage Vrrm Max: 100V
  3. Forward Current If(AV): 4A
  4. Bridge Rectifier Case Style: SIP
  5. Forward Voltage VF Max: 1.1V
  6. No. of Pins: 4Pins
  7. Operating Temperature Max: 125°C

    1. Also, Please tell me with the above ratings what will be the total voltage drop in the bridge rectifier when I give input as 9v and what will be the output current.

P.S I am not an electrical engineer. Please apologize me if I used any wrong electrical terms or asked any silly questions.

Thanks in advance.


1 Answer 1


Since only two elements will be on at a time, the drop across the regulator is 1.1 on each side, so a total of 2.2. A little less than that at 3A.

Output current is dictated by the rest of the circuit.

As for the specs.. Watch your power. That device may get rather too hot at 3A with no heat sink. I believe Max current shown will be for a heat-sinked installation. 150C is way too hot.....

  • \$\begingroup\$ Thanks for the reply. That's my question what does this element indicate here. Does two element indicate directly to two diodes? and you mean during +ve half cycle 2.2v drop and during -ve cycle again 2.2v drop am I, right? \$\endgroup\$
    – kaviarasan
    Commented May 10, 2017 at 10:25
  • \$\begingroup\$ @kaviarasan correct,, but see my addition to the answer.... \$\endgroup\$
    – Trevor_G
    Commented May 10, 2017 at 10:26
  • \$\begingroup\$ As of now, my device won't draw 3A current. Max will be 1A just for future development I am using 4A rectifier. Can you please tell me does Vrrm of 100v is sufficient for bridge rectifier for the input voltage of max of 40v or do I need to choose other Vrrm ratings. \$\endgroup\$
    – kaviarasan
    Commented May 10, 2017 at 10:32
  • \$\begingroup\$ @kaviarasan 100V will be fine. \$\endgroup\$
    – Trevor_G
    Commented May 10, 2017 at 10:35

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