RHRP 1560 600V 15A: The Ultimate Hyper Fast Diode for High-Efficiency Circuits

A few years ago I repaired a solar inverter that kept blowing its output diode every two or three weeks. The owner was tired of paying for repairs, and I was tired of seeing my own work fail. My replacement was a standard fast-recovery type that should have been fine in theory. In practice, its slow recovery dumped extra heat into an already hot enclosure. I swapped in an RHRP1560, a hyperfast diode rated 600 V and 15 A, and that inverter ran without another failure for as long as I tracked it. I sell and repair power electronics every day at SunTech Mall, and I have seen this story many times. Pick the wrong diode and you get heat, noise, and mystery failures. By the end of this guide, you will know exactly what the RHRP1560 can do, where it belongs, and how to install it so it lasts. Let us start with what “hyperfast” actually means.

No hype here. The RHRP1560 is excellent for the right jobs, but not for every circuit. Some designs suit Schottky or silicon carbide better, and I say so below. What follows is practical guidance from the datasheet and years of bench experience.

What You Will Learn From This Guide

• What “hyperfast” really means
• The specs that affect your build
• Why 40 ns recovery changes your losses
• Matching the diode to the right job
• RHRP1560 vs. standard rectifier diodes
• RHRP1560 vs. other 15 A, 600 V fast diodes
• Installing it with proper heatsinking
• Buying genuine parts, avoiding counterfeits
• Answers to common questions

What “Hyperfast” Really Means for Your Circuit

The first time I saw “hyperfast” on a diode box, I was skeptical. It sounded like marketing. Then I measured one. A diode conducts in one direction and blocks in the other, and the trouble lives in the tiny moment between those jobs. When current reverses, the diode does not shut off instantly; it needs time to clear the charge inside. That time is the reverse recovery time, the most important number on any switching diode.

A plain rectifier can take microseconds to recover. An ultrafast diode needs tens or hundreds of nanoseconds. A hyperfast diode goes further: the RHRP1560 recovers in 40 ns typical at 15 A, with soft recovery, per the onsemi datasheet. Soft recovery means smooth turn-off instead of a hard snap that rings. That ringing is electrical noise and extra stress on your switching transistor.

Note: Some online listings describe the RHRP1560 as a 50 ns part, but the official onsemi/Fairchild datasheet (November 2013) specifies a typical reverse recovery time of 40 ns at 15 A, and a maximum forward voltage of 2.1 V at 25 °C case temperature. When numbers conflict, always trust the manufacturer’s datasheet.

So “hyperfast” is not just a label. It is measured behavior: 40 ns, soft, clean turn-off. If your circuit switches at tens or hundreds of kilohertz, that speed keeps losses low and your transistor safe.

The Datasheet Numbers That Actually Affect Your Build

I have watched beginners drown in datasheets and miss the numbers that matter. Here are the RHRP1560 specs that should drive your design:

• VRRM (reverse voltage): 600 V, the maximum it can block repeatedly without damage.
• IF(AV) (forward current): 15 A continuous, with proper heatsinking.
• trr (recovery time): 40 ns typical at 15 A. This is the hyperfast part.
• VF (forward voltage): 2.1 V max at 25 °C case. At 15 A it drops about two volts while conducting.
• Package: TO-220AC-2L through-hole, with a metal tab that bolts to a heatsink.
• Junction temperature: up to 150 °C; storage down to −65 °C.
• Construction: silicon nitride passivated epitaxial planar, avalanche energy rated, soft recovery.

Read the forward voltage line twice. Two volts at 15 amps means about 30 watts of heat while conducting, which is why the TO-220AC has a metal tab for a heatsink. The forward voltage drop is the price of a silicon diode that blocks 600 V. Every choice in power electronics is a trade.

You can check current stock and prices for the RHRP1560 600V 15A hyperfast diode at SunTech Mall.

Why 40 Nanoseconds of Recovery Time Changes Your Losses

Here is the failure from my intro, explained. In that inverter, a standard diode recovered slowly. Every cycle, for a brief moment, the diode conducted backward while the transistor turned on. Current flowed the wrong way through both parts at once, and that overlap became pure heat. The slower the diode, the longer the overlap.

At 50 kHz, each cycle is 20 microseconds. A diode needing 500 ns to recover misbehaves for a real slice of every cycle. One recovering in 40 nanoseconds barely registers. Across millions of cycles per second: cooler parts, and a supply that delivers its rated output without derating.

Bonus Tip: If you are troubleshooting a hot SMPS and the main switching transistor runs warm even at light load, suspect the freewheeling diode before you blame the transistor. A slow diode punishes the transistor first.

A diode that snaps off hard excites parasitic inductance in PCB traces, causing ringing that stresses everything nearby. The RHRP1560 turns off gradually, keeping noise down and preventing resets in your control circuitry.

Where the RHRP1560 Shines in Real Circuits

I keep RHRP1560s on my repair bench because they cover so many real jobs. The datasheet points at switching power supplies, power switching circuits, and freewheeling/clamping use. My real-world list:

• SMPS output rectification: The classic job. The output diode switches at the converter’s full frequency, so speed is everything.
• Motor drive freewheeling: When an inductive load switches off, the collapsing field needs somewhere to go. The RHRP1560 catches it fast.
• Solar inverter stages: Boost and buck stages switch hard and run hot. Hyperfast recovery keeps losses down where cooling is difficult.
• PFC boost diodes: One of the hardest-worked diodes in any supply. A natural home for a hyperfast part.
• UPS systems: Compact, warm enclosures need reliable rectification, and low recovery losses help.

Where it does not belong: small-signal work, and low-voltage rails under 100 V where a Schottky wins. For top efficiency at 600 V, silicon carbide beats it but costs several times more. The RHRP1560 is the sweet spot. See more real-circuit guides on the SunTech Mall blog.

RHRP1560 vs. Standard Rectifier Diodes: An Honest Comparison

A customer once asked why he should not just use the cheapest 15 A diode in the drawer. Fair question, fair answer:

• Recovery time: RHRP1560 recovers in about 40 ns. A standard rectifier can take microseconds, dozens of times slower.
• Forward drop: The RHRP1560’s roughly 2 V is actually higher than a standard diode’s typical 1 V. Speed costs voltage, so budget for the heat.
• Cost: The standard diode is cheaper. But one field failure costs far more than the price difference.

In a 50 Hz mains rectifier, a standard diode is fine. The moment your circuit switches fast, the switching loss advantage of the hyperfast diode pays for itself in reliability. Match the diode to the frequency, not the price tag.

Note: A hyperfast diode does not fix a bad layout. Long, loopy PCB traces add inductance that slows everything down no matter how fast the diode is. Keep the diode close to the switching device with short, wide traces.

RHRP1560 vs. Other 15 A, 600 V Fast Diodes

The RHRP1560 has well-known cousins, and customers ask about them weekly. The MUR1560 is also 15 A and 600 V, but its recovery is around 60 ns, a step slower, while its forward drop is lower at about 1.5 V. The UF5408 family is cheaper, but it is ultrafast, not hyperfast.

Which should you pick? If every nanosecond of recovery matters at very high frequency, the RHRP1560’s extra speed is worth it. If conduction loss dominates, the lower drop of the MUR1560 may serve you better. Find the genuine RHRP1560 at SunTech Mall, and if you are unsure which part fits, email info@suntechmall.com with your circuit details.

How to Install It Right: Heatsinking and Layout

Too many diodes die from bad installation, not bad parts. The RHRP1560 handles 15 A only if heat has somewhere to go: at full current the forward drop turns roughly 30 watts into heat, and a bare TO-220 tab cannot shed that alone.

• Heatsink it: Use thermal compound or a pad. The tab is the cathode, so insulate it with a mica or silicone pad plus a shoulder washer if the heatsink is grounded or shared.
• Keep margin: Stay comfortably below 600 V and 15 A, with at least 20 percent headroom.
• Short leads: Keep connections between diode, transistor, and output capacitor short and direct to cut inductance and ringing.
• Match the companions: Use low-ESR output capacitors and a transistor rated for your frequency.
• Test at full load: The heatsink should warm evenly and stay touchable. If it scalds within a minute, check load current, frequency, and thermal contact.

Bonus Tip: When you replace a diode, always test the transistor it works with. A slow diode often takes the transistor down with it, and a weak transistor can kill your new diode in return.

After any diode replacement, run the unit at full load for thirty minutes before calling the job done. Heat failures hide in short bench tests and appear in the customer’s home.

Buy Genuine Parts: Counterfeits Will Burn Your Circuit

This is the part I care about most. The RHRP1560 is popular, and popular parts get counterfeited. A fake may be a relabeled slow rectifier in a TO-220 package. It will pass a multimeter diode check, because that test cannot measure recovery time. Install it in a 65 kHz circuit, and the transistor dies within hours.

I have seen the aftermath: scorched boards, dead MOSFETs, and customers blaming the design when the culprit was a fake part. Genuine RHRP1560s have correct markings and datasheet behavior. Buy from a supplier who sources properly and stands behind the parts. We stock the original RHRP1560 at SunTech Mall because our repair customers cannot afford mystery parts. Check current prices on SunTech Mall; for quantity orders contact info@suntechmall.com or +92 306 2244820.

Frequently Asked Questions

What is the RHRP1560 diode used for?

The RHRP1560 is a hyperfast diode for SMPS, solar inverters, motor drives, UPS, and PFC circuits. Anywhere a diode must switch tens of thousands of times per second at up to 600 V and 15 A: as output rectifier, freewheeling diode, or clamping diode.

What does 600V 15A mean on the RHRP1560?

600 V is the maximum reverse voltage it can block repeatedly, and 15 A is the maximum average forward current with proper heatsinking. Stay below both with a safety margin. Overvoltage risks instant breakdown; overcurrent overheats the junction.

How fast is the RHRP1560’s reverse recovery?

The datasheet specifies 40 ns typical at 15 A, with soft recovery. That is roughly half the recovery of ordinary ultrafast diodes, hence the “hyperfast” name. Soft recovery means smooth turn-off, which reduces ringing and electrical noise.

Can I replace a standard rectifier diode with an RHRP1560?

Usually yes, if the ratings fit. A hyperfast diode works fine at low frequencies too. The main check is forward drop: at 2.1 V maximum the RHRP1560 drops more than a standard diode, so confirm your heatsinking can handle it.

Does the RHRP1560 need a heatsink?

At currents above a few amps, yes. The forward drop turns real power into heat: at 15 A, roughly 30 watts. The TO-220AC package is made to bolt onto a heatsink with thermal compound. At very light loads you may manage without one, but for serious current, heatsink it.

What is the difference between RHRP1560 and MUR1560?

Both are 15 A, 600 V fast diodes in TO-220 packages. The RHRP1560 is hyperfast at about 40 ns recovery; the MUR1560 is ultrafast at about 60 ns but has a lower forward drop of about 1.5 V versus 2.1 V max. Pick the RHRP1560 when switching speed matters most, the MUR1560 when conduction loss dominates.

Where can I buy a genuine RHRP1560 in Pakistan?

Order the genuine RHRP1560 from SunTech Mall with delivery across Pakistan, single pieces or bulk for repair shops. For bulk pricing or help choosing, email info@suntechmall.com or WhatsApp +92 306 2244820.

Final Thoughts

That inverter from my intro taught me a lesson I use daily: in power electronics, speed is survival. A diode that cannot keep up punishes every part on the board. The RHRP1560, with 40 ns hyperfast recovery, 600 V blocking, and 15 A capacity, solves that in SMPS stages, inverters, motor drives, and PFC circuits.

Congratulations, you now know more about this diode than most people who install it. You can read the specs that matter, you know why recovery time decides efficiency, and you know how to mount it so it survives.

Repairing a supply, building an inverter, or stocking your workshop? Get the genuine part from a supplier you can trust. Visit the RHRP1560 product page on SunTech Mall to check current prices, explore repair knowledge on the SunTech Mall blog, or start from our homepage. Questions? Email info@suntechmall.com or WhatsApp +92 306 2244820. We answer, because we repair these circuits ourselves.