Ultra Fast Recovery Rectifier Diode
Built for power boards where the rectifier must turn off cleanly before the next switching cycle, this high-speed diode family helps designers control heat, improve energy transfer and keep compact supplies running smoothly. It is a practical choice for SMPS output stages, charger modules, inverter boards and LED driver platforms.
Why This Part Matters in a Power Circuit
In a switching supply, diode loss is not only about forward voltage. The reverse recovery tail can create extra current spikes, transformer stress and temperature rise. The UFR series shortens that tail, giving the design more margin when the PCB space is limited or the switching frequency is higher than a line-frequency rectifier can handle.
The device moves from conduction to blocking quickly, helping reduce unwanted current overlap in converter stages.
Lower dynamic loss can ease the burden on heat sinks, copper area and enclosure ventilation.
Families up to 1000V allow engineers to choose a rating that matches input surges and transformer leakage spikes.
Axial, DO-15, DO-201AD, TO-220 and SMD choices make it easier to match both new layouts and replacement projects.
Model cross-reference support helps purchasing teams replace obsolete or hard-to-source part numbers.
Datasheets, labels, carton marks and shipment documents can be prepared according to your order requirement.
Model Range and Selection Guide
Use this table to narrow the first choice. Final confirmation should consider waveform, thermal condition, allowed reverse voltage margin, package height and assembly method.
| Part Number Family | Typical Current | Voltage Rating | Speed Class | Package | Best Fit |
|---|---|---|---|---|---|
| UF4001 to UF4007 | 1.0A | 50V to 1000V | Fast turn-off, commonly 50ns to 75ns | DO-41 / A-405 | Small adapters, auxiliary supplies and compact rectifier positions |
| HER101 to HER108 | 1.0A | 50V to 1000V | High-efficiency rectifier grade | DO-41 | General high-speed power boards and freewheel paths |
| HER201 to HER208 | 2.0A | 50V to 1000V | Short recovery design | DO-15 | Chargers, LED drivers and medium-current converter outputs |
| HER301 to HER308 | 3.0A | 50V to 1000V | Designed for faster commutation | DO-201AD | Power supply modules and appliance control boards |
| MUR120 to MUR160 | 1.0A | 200V to 600V | High-speed rectifier class | DO-41 | Clamp, snubber and pulse rectifier circuits |
| MUR420 to MUR460 | 4.0A | 200V to 600V | Low-loss commutation grade | DO-201AD | Inverter boards, UPS modules and higher-current supplies |
| MUR820 to MUR860 | 8.0A | 200V to 600V | Power package speed series | TO-220AC | Industrial converters, motor-related circuits and large power modules |
| ES1A to ES1J / ES2A to ES2J / ES3A to ES3J | 1.0A to 3.0A | 50V to 600V | SMD high-speed family | SMA / SMB / SMC | Thin PCB assemblies, automated placement and space-saving designs |
Where Engineers Use These Rectifiers
The part is most valuable when switching noise, temperature or efficiency leaves little design margin. Below are typical use cases where a standard rectifier may be too slow.
Handles fast current transitions after the transformer and helps reduce loss in compact adapter designs.
Works in boost, buck and flyback topologies where repeated turn-off events happen at high speed.
Provides a robust path for rectification and clamping in equipment exposed to pulsed current.
Supports stable lighting output while keeping the driver module cooler under long operating hours.
Suitable for wall chargers, tool chargers and industrial charging modules with compact PCB space.
Used in relay drive, motor control support circuits and auxiliary power rails inside industrial systems.
How to Compare Rectifier Choices
| Option | Strength | When to Use It | Watch Point |
|---|---|---|---|
| Standard rectifier | Simple structure and economical cost | Line-frequency AC/DC input and low-speed boards | Too much stored charge for many modern SMPS positions |
| Fast recovery series | Balanced speed and wide voltage range | Medium-frequency supplies and general freewheel circuits | May still run warm if the duty cycle is demanding |
| Ultra Fast Recovery Rectifier Diode | Shorter reverse recovery interval for lower dynamic loss | High-voltage, high-speed designs that need better efficiency | Check package dissipation and surge current carefully |
| Schottky rectifier | Low forward drop, excellent for low-voltage outputs | 5V, 12V and other low-voltage rails | Reverse voltage and leakage limits may not fit every design |
Selection Notes for Purchasing and Engineering
- Choose repetitive reverse voltage with enough margin for spikes and line variation.
- Confirm average current under real board temperature, not only room-temperature rating.
- Review surge capability if the circuit has large input capacitors or transformer inrush.
- Compare recovery time under the same test condition when replacing another brand.
- Check forward voltage because lower conduction loss may be as important as speed.
- Match body size, lead diameter and mounting height before changing package series.
- For SMD designs, confirm SMA, SMB or SMC footprint and reel packing direction.
- Ask for sample confirmation if the application has strict thermal or EMI requirements.
- Provide the old part number so we can suggest UF, HER, MUR or ES alternatives.
- Tell us if OEM marking, special label or carton identification is required.
Quality Workflow Before Shipment
A power diode looks simple from the outside, but consistency depends on controlled material, screening and packing. Our order flow is arranged to reduce sourcing risk for distributors and equipment manufacturers.
Confirm part number, package, voltage, current and replacement target.
Arrange sample support for new projects or cross-reference approval.
Check forward drop, reverse leakage and breakdown characteristics.
Inspect labels, quantity, reel condition, bulk bag and export carton.
Provide tracking details and help prepare repeat-order documents.
Packaging, Customization and Delivery
- Bulk, ammo, tape and reel packing can be arranged according to package type.
- Lead free finish and RoHS compliant supply are available for export use.
- Custom model label, carton mark and OEM marking can be discussed for volume orders.
- Datasheet and replacement model support can be provided during project evaluation.
- Express shipping by DHL, UPS, FedEx, TNT or EMS for samples and urgent batches.
- Air shipment is suitable for medium quantity and time-sensitive production plans.
- Sea shipment can reduce freight cost for larger distributor or OEM orders.
- Lead time depends on stock, quantity, package and any special marking requirement.
FAQ
Q1: What makes this diode different from a common rectifier?
It is designed to stop conducting more quickly after polarity changes. That behavior helps reduce heat and current spikes in switch-mode circuits.
Q2: Which model should I start with for a 1A design?
UF4001 to UF4007 and HER101 to HER108 are common starting points. The exact choice depends on reverse voltage, PCB space and thermal margin.
Q3: Can this replace FR series parts?
In many circuits it can be considered as an upgrade, but the final decision should compare package, current rating, voltage rating and test condition.
Q4: Do you have surface mount options?
Yes. ES series parts in SMA, SMB and SMC packages are suitable for automated assembly and compact boards.
Q5: What information is useful for a quotation?
Please send the target model, quantity, package, voltage, current, packing preference and delivery country. A replacement part number is also helpful.
Q6: Can you support OEM or distributor orders?
Yes. We can discuss custom labels, carton marks, packing methods and steady supply plans according to order quantity.
Send Your Rectifier Requirement
Rugao Lian Tuo Electronics can help confirm datasheet parameters, equivalent models, samples and wholesale pricing. Share your part number, application, voltage rating, current rating and package requirement for a faster response.
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