MDD FR107-T/B
Full Technical Specifications
13 Parameters| Parameter / Attribute | Specification / Value |
|---|---|
| Series | DO-41 |
| Mounting | Through Hole |
| Voltage - DC reverse (Vr) | 1000 V |
| Voltage - forward (Vf) (Max) @ if | 1.3 V @ 1 A |
| Current - reverse leakage @ vr | 6 µA @ 1000 V |
| Current - average rectified | 1A |
| Operating temperature - junction | -65°C ~ 150°C |
| Speed | Fast Recovery =< 500ns, > 200mA (Io) |
| Package | Tape & Box (TB) |
| Technology | Standard |
| Case | DO-204AL, DO-41, Axial |
| Capacitance @ vr, | 15pF @ 4V, 1MHz |
| Reverse recovery time | 500 ns |
Need Stock or a Drop-in Second-Source for FR107-T/B?
Package: DO-41 / DO-15 · Pin-compatible replacements with immediate Shenzhen spot stock
The FR107 is the fast-recovery diode of the repair drawer - the same DO-41 body and 1000V headline as a 1N4007, with a recovery time about four times quicker, which is exactly why the two get confused at the bench and on BOMs. Around it sits a family of recovery classes and packages that buyers mix freely: FR207 (the DO-15 2A sibling), RL207 (the standard-recovery cousin with lower forward drop), HER208 (75ns ultra-fast at a higher forward voltage). Choosing among them is done on three numbers - recovery time, current, and forward drop - and the failure mode of guessing wrong is an overheating diode in a switching stage.
Verified Pin-Compatible Replacements (4 verified alternatives)
The 2A Sibling
Shenzhen Spot Stock (24-48h Dispatch)
Same 1000V fast-recovery class (trr around 500ns) at 2A instead of 1A, in the larger DO-15 body.
VRRM 1000V; IO 2A; the direct current upgrade from FR107.
Standard Recovery, Lower Drop
Shenzhen Spot Stock (24-48h Dispatch)
1000V / 2A in DO-15 - but standard recovery (microsecond class, not nanoseconds) with a lower forward drop (about 1.1V versus 1.3V).
VRRM 1000V; IO 2A; recovery too slow for switching stages.
The 75ns Ultra-Fast Grade
Shenzhen Spot Stock (24-48h Dispatch)
1000V / 2A ultra-fast family: recovery about 75ns against 500ns for the FR class - at the cost of a notably higher forward drop (about 1.7V at 2A).
VRRM 1000V (HER208; note HER207 is the 800V grade); IFSM about 60A.
The Slow Baseline - Listed to Be Avoided
Shenzhen Spot Stock (24-48h Dispatch)
Same DO-41 body and 1000V / 1A headline, but standard recovery in the microsecond class (about 2us) - roughly four times slower than the FR107 it gets confused with.
VRRM 1000V; IO 1A; the slowest of the family.
Buyer & Quality Checklist for Sourcing Alternatives
- Pick by frequency first: 50/60Hz rectification and clamps tolerate standard recovery (1N4007 / RL207); anything switching above roughly 1kHz wants the FR class (500ns); switching supplies and high-frequency paths want HER-class (75ns). Body size says nothing about speed.
- Read the forward-drop trade honestly: the faster the class, the higher the VF at the same current (RL about 1.1V, FR about 1.3V, HER about 1.7V at rated current). In high-duty-cycle designs the ultra-fast part can run hotter, not cooler.
- Voltage grades inside one family move by tens of volts: FR104 is the 400V member, FR107 the 1000V; HER207 is 800V where HER208 is 1000V. The last digits are the voltage - substituting downward removes margin.
- FR107 is DO-41 / 1A; FR207 is DO-15 / 2A. Cross the family only with the package and current noted, or the leads and the thermal budget both change.
- Axial bodies in the same drawer look alike: mark the FR / HER / RL groups separately in stock - the bench confusion this page exists to prevent starts in the parts bin.
- For surface-mount migration the equivalents are the SMA ultrafast series (US1M and relatives) - check recovery class again in the SMD family, which mixes standards under similar-looking numbers.
Frequently Asked Technical Questions
Q: Can I replace an FR107 with a 1N4007?
A: Only in slow circuits. The 1N4007 is the standard-recovery (about 2us) part against the FR107 fast-recovery (about 500ns) class. At mains frequency they interchange; in any switching position the slow part overheats and radiates noise.
Q: What is the difference between FR107 and FR207?
A: Current and body: FR107 is 1A in DO-41, FR207 is 2A in the larger DO-15, both 1000V fast-recovery. Use the FR207 when the current outgrew the FR107 and the board accepts the slightly larger body.
Q: FR107 vs HER208 - which is faster?
A: HER208: about 75ns recovery against roughly 500ns for the FR107, at a higher forward drop (about 1.7V versus 1.3V). Higher switching frequency favors the HER; high duty cycle at lower frequency often favors the FR on losses.