Product Detail
- Recovery time: 25ns-150ns.
- Current range: 1A-30A.
- Models: UF4007, HER108.
- Use case: fast switching.
Product Description
This ultrafast recovery diode page is for power circuits where a standard FR diode leaves too much reverse-recovery loss, heat or waveform noise. You can compare UF4007, HER108, ES1J, SF series, MUR devices and power-package ultrafast options by recovery time, softness, current, voltage, package and temperature. The 25ns to 150ns range is useful in SMPS outputs, PFC boost stages and inverter auxiliary paths. Lian Tuo helps you choose a fast part that solves the measured switching problem without overspecifying the whole BOM. That keeps the speed decision tied to what your board actually shows.
Our Ultrafast Recovery Diode Options
| UF4007 Ultrafast Recovery Diode | 1A axial 1000V option for compact switching boards needing faster recovery than FR parts. |
| HER108 Ultrafast Recovery Diode | High-efficiency axial choice for 1A, 1000V circuits where heat and recovery both matter. |
| ES1J Ultrafast Recovery Diode | SMD direction for automated assembly, compact layouts and fast auxiliary rectifier positions. |
| MUR Ultrafast Recovery Diode | Power-package family for stronger current paths, snubber work and high-voltage switching stages. |
| SF Series Ultrafast Diode | Super-fast axial option for engineers comparing recovery speed, package fit and replacement cost. |
Feature Box
- Fast Recovery25ns-150ns speed helps reduce switching loss.
- Waveform ControlCleaner recovery can ease heat and noise issues.
- Package RangeAxial, SMD and power styles can be compared.
- Measured FitSelection follows circuit frequency and waveform stress.
Solve A Real Switching Problem
An ultrafast recovery diode should be chosen when the circuit shows recovery loss, heat or waveform trouble that a standard FR diode cannot handle. The faster part should solve a measured issue, not simply look better in a table. Share frequency, waveform and load current before sampling. It also gives purchasing a cleaner reason for the approved replacement.
Compare Recovery Softness
Recovery time is important, but the way the diode recovers also affects switching noise and stress. Some ultrafast recovery diode choices behave more softly than others. If EMI or ringing is part of the problem, include that detail with the RFQ so the model shortlist is more useful. That keeps the speed decision tied to what your board actually shows.
Match Voltage And Package
UF4007, HER108, ES1J and MUR-style parts do not serve the same board space or current path. An ultrafast recovery diode must match reverse voltage, surge rating and package heat path together. That keeps a faster diode from creating a new mechanical or thermal problem. It also gives purchasing a cleaner reason for the approved replacement.
Avoid Unnecessary Premium Parts
A circuit that only needs moderate recovery may not benefit from a more expensive ultrafast package. Lian Tuo can help compare standard FR and ultrafast recovery diode options so your BOM keeps the speed it needs without paying for unused margin. That keeps the speed decision tied to what your board actually shows.
Vertical Product Applications
SMPS Output Rectifiers
Use an ultrafast recovery diode in SMPS output or auxiliary rectifier positions when switching frequency and heat make standard FR parts uncomfortable. The diode should match recovery time, voltage stress and package cooling so the supply stays efficient during continuous operation. It also gives purchasing a cleaner reason for the approved replacement.
PFC Boost Paths
PFC boost stages can expose a diode to high voltage and fast current transitions. An ultrafast recovery diode can reduce recovery stress when SiC is not required or not in budget. Confirm reverse voltage, current and thermal path before sample approval. That keeps the speed decision tied to what your board actually shows.
Inverter Auxiliary Rails
Inverter auxiliary rails need parts that handle switching noise and temperature without becoming hard to source. An ultrafast recovery diode can fit these smaller power paths when package and voltage margin are reviewed early. Share the rail role before quoting. It also gives purchasing a cleaner reason for the approved replacement.
FAQ
When should I use an ultrafast recovery diode?
Use it when a standard FR diode creates too much recovery loss, heat or waveform stress. The 25ns to 150ns range is useful in many SMPS, PFC and inverter auxiliary circuits that switch faster than older rectifier designs. It also gives purchasing a cleaner reason for the approved replacement.
Is UF4007 the same as FR107?
No. UF4007 is an ultrafast recovery diode, while FR107 is a standard fast recovery diode. Both may share axial packaging, but recovery behavior and switching suitability differ. Check circuit speed before replacing one with the other. That keeps the speed decision tied to what your board actually shows.
What does recovery time mean here?
Recovery time describes how quickly the diode stops conducting after switching from forward to reverse bias. A shorter time can reduce switching loss and stress, but the full behavior also depends on current, voltage and temperature. It also gives purchasing a cleaner reason for the approved replacement.
Can ultrafast diodes reduce EMI?
They can help when reverse recovery is driving noise, but faster parts can also change ringing behavior. EMI should be reviewed with the actual waveform, layout and snubber design instead of assuming one diode family fixes every case. That keeps the speed decision tied to what your board actually shows.
What data helps quote ultrafast recovery diodes?
Send voltage, current, recovery-time target, package, frequency, target model and quantity. If the diode is replacing a failed part, include a board photo and any heat or waveform notes from testing. It also gives purchasing a cleaner reason for the approved replacement.
When is a standard FR diode enough?
A standard FR diode may be enough when the switching speed is moderate and recovery loss is not causing heat or waveform problems. In that case, moving to ultrafast can add cost without improving the product. That keeps the speed decision tied to what your board actually shows.
Can Lian Tuo support ultrafast equivalents?
Yes. We can compare UF, HER, ES, SF and MUR-style ultrafast recovery diode options by speed, voltage, current, package and availability so your sample list fits the circuit requirement. It also gives purchasing a cleaner reason for the approved replacement.
