Power Devices for Telecom Rectifiers and UPS Systems
Super junction MOSFETs, SiC diodes and fast recovery diodes for telecom rectifiers, server PSUs and UPS inverters, with HTRB and H3TRB reports per part.
Telecom rectifiers and UPS systems run continuously at high ambient with a service life measured in a decade, so device selection is driven by derating margin and long-term stability rather than by peak efficiency. OCENME supplies 650 V super junction MOSFETs, SiC Schottky diodes and fast recovery diodes for rectifier PFC stages and UPS inverter legs, with HTRB and H3TRB reports per part number.
Scope of supply in this sector
This page covers AC/DC rectifier modules from 500 W to 3 kW, server power shelves and line-interactive or online UPS inverter stages. It does not cover battery management, IGBT-based large UPS above 20 kVA, or DC/DC bricks.
Requirements
| Power range | 500 W to 3 kW per rectifier module |
|---|---|
| PFC switch | 650 V super junction or SiC MOSFET, 20 A class |
| PFC diode | 650 V SiC Schottky, 20 A, zero reverse recovery |
| Inverter freewheel | 600–1200 V fast recovery diode |
| Ambient | 55 °C continuous in a rack, 65 °C short term |
| Design life | 10 years continuous, 24/7 |
| Efficiency | Titanium-class 96% for telecom rectifiers |
Materials we machine for this sector
- Silicon super junction die
- SiC JBS die
- Epitaxial fast recovery die
- Copper lead frames
Applicable standards
- IEC 62040 for UPS performance and safety
- ETSI EN 300 132-2 for telecom DC power interfaces
- IEC 61000-3-2 harmonic limits
- Telcordia GR-1089 for telecom equipment EMC and surge (end product)
Typical parts
- 650 V super junction MOSFET, 150 mΩ to 190 mΩ, TO-220F and TO-247
- 650 V / 20 A SiC Schottky diode for the PFC boost stage
- 650 V SiC MOSFET for high-frequency LLC primary side
- 600–1200 V fast recovery diodes for inverter freewheeling
- 100 V MOSFETs for ORing and hot-swap circuits
Quality risks specific to this sector
These are the failure modes we see most often in this industry. They are listed because knowing them before design review is cheaper than discovering them at first article.
- Humidity-driven failure in non-hermetic enclosures — H3TRB data is the relevant evidence, not HTRB alone
- Derating calculated at 25 °C case and applied to a 55 °C rack, halving the real margin
- PFC diode selected on forward drop alone, ignoring the reverse-recovery loss it forces into the switch
- Field returns traced to a die source change that was never notified to the customer
Compliance and capability questions
Why does humidity testing matter more than temperature for telecom?
Telecom equipment runs in sheltered but non-airconditioned enclosures where humidity cycles daily. H3TRB stresses the junction and passivation under both bias and moisture, which is the failure mode that shows up in year three of a ten-year life. A part that passes HTRB but was never tested under humidity bias is not evidence for this application.
Is SiC worth it in a 1 kW telecom rectifier?
At Titanium efficiency targets, yes: the PFC stage at 65–100 kHz is where SiC earns its price, because zero reverse recovery allows higher frequency and a smaller boost inductor. Below 96% efficiency targets, a well-designed super junction PFC is usually cheaper and adequate.
What derating should I apply at 55 °C ambient?
Derate continuous current so that the junction stays at or below 125 °C in the worst-case ambient, not 150 °C. For a TO-220F part with a modest heatsink, that typically halves the 25 °C rating. The arithmetic belongs in the design file, because a supplier quoting a 25 °C rating into a 55 °C rack is quoting a number that does not apply.
Can you support a ten-year service life claim?
We can supply the reliability evidence — HTRB, H3TRB, temperature cycling, and lot-specific reports — plus lot traceability for a field return. A ten-year life claim also depends on your thermal design, your capacitor selection and your derating, so no component supplier can make that claim on your behalf.
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View sectorSend the part number and the operating conditions
Tell us the voltage class, current, switching frequency and what the device is replacing. You will get a datasheet, a parameter comparison at matched conditions, and a quotation with MOQ and lead time.