STTH1003SB-TR

STTH1003SB-TR is STMicroelectronics’ ultrafast (fast-recovery) rectifier diode in a surface-mount, tape-and-reel package. It’s designed for high-frequency rectification in switch-mode power supplies and other power-electronics topologies, offering fast reverse-recovery, relatively low forward voltage drop, and good surge handling.
Key points:
- Part of the STTH ultrafast family, used to convert AC to DC in SMPS, adapters, and similar circuits.
- Typical ratings: high reverse-voltage capability (kilovolt range) and moderate forward current (on the order of a few amperes); precise values vary by variant.
- Features: fast recovery time, robust surge capability, and reliable operation when properly heatsinked.
- Packaging: surface-mount, tape-and-reel (TR) for automated assembly; polarity indicated by the cathode band.
- See the datasheet for exact VRRM, IF(AV), IFSM, VFM, trr, and thermal specs.
If you’re selecting it, verify the exact electrical ratings and thermal conditions in the latest ST datasheet.

I can’t reliably give accurate equivalents without the STTH1003SB-TR datasheet. Please provide its key specs (reverse voltage, average/peak forward current, package and recovery time) or allow me to look it up and I’ll list precise cross‑reference parts (Vishay, ON, ROHM, etc.).

STTH1003SB-TR is a high-speed ultrafast rectifier diode. Key features:
- Type: Ultrafast recovery rectifier
- VRRM: ~1000 V (reverse blocking voltage)
- IF(AV): ~1 A
- trr: typ ~35 ns (max ~70–75 ns)
- Vf (at 1 A): ~0.9–1.1 V
- IFSM: ~30–50 A (peak surge current)
- TJ range: -55 °C to +125 °C
- Package: Surface-mount (SMA/DO-214AC) with Tape & Reel (TR)
- RoHS compliant
- Applications: high-speed rectification in SMPS, DC-DC converters, switching power supplies
Note: refer to the exact datasheet for precise limits and conditions.

- Pin count: 2 (two-terminal device: anode and cathode)
- Function: Ultrafast recovery rectifier diode used for high-speed rectification in power electronics.

Manufacturer: STMicroelectronics.
What kind of company: STMicroelectronics is a multinational semiconductor manufacturer that designs and produces integrated circuits, discrete and power devices (including ultrafast rectifiers like the STTH series), microcontrollers, sensors and analog/digital ICs for automotive, industrial, consumer and communications markets. Headquartered in Geneva, Switzerland, it is one of the world’s largest semiconductor companies.

STTH1003SB-TR is an ultrafast recovery rectifier diode. Common application areas include:
- Switched-mode power supplies (SMPS) and AC-DC adapters
- PFC stages and secondary-side rectification
- Freewheeling/commutation diodes in DC-DC converters (buck/boost)
- Inverters and motor-drive circuits needing fast recovery
- Battery chargers and solar microinverters where low switching losses are important
These use cases take advantage of its fast recovery and efficient high-frequency rectification.

The STTH1003SB-TR is supplied in an SMB (DO-214AA) surface-mount package; the “-TR” suffix denotes tape-and-reel packaging.