STPS40A45CHYG STMicroelectronics Schottky Diode (Transistor Outline, Vertical) In Stock
STMicroelectronics STPS40A45CHYG is an aerospace-grade dual Schottky rectifier in a common-cathode configuration rated at 2 x 20 A continuous and 45 V reverse voltage. Maximum forward voltage drop of 0.82 V and 200 A non-repetitive peak current capability in a TO-254AA package for high-reliability applications. Available from stock worldwide for aerospace power supply and rectifier bridge designs.
- Manufacturer
- STMicroelectronics
- Package
- Transistor Outline, Vertical
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- STPS40A45CHYG Datasheet PDF
- Category
- Schottky Diode
- Temp Range
- -65.0°C to 175.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual 20 A, 45 V Schottky silicon rectifier in common-cathode TO-254AA package with non-repetitive peak forward current of 200 A for aerospace power supply applications
- Low forward voltage drop of 0.82 V maximum at 20 A reduces conduction losses and heat dissipation compared to standard PN-junction rectifiers in high-current rectifier bridges
- Aerospace-qualified device introduced in 2020, designed for high-reliability power conversion in space, avionics, and military electronic systems with strict environmental requirements
Applications
The STPS40A45CHYG is intended for aerospace and high-reliability military power supply rectifier bridges, input protection circuits, and freewheeling diode applications in DC-DC converters where radiation tolerance and long operational lifetime are required. Its common-cathode dual configuration allows direct use in center-tapped full-wave rectifier topologies without external busing between two separate diodes. The 45 V reverse blocking voltage and 20 A per element rating make it suitable for 28 V DC bus rectification in aircraft secondary power distribution units.
Specifications
| Date Of Intro | 2020-03-20 |
| YTEOL | 5.7 |
| Application | GENERAL PURPOSE |
| Configuration | COMMON CATHODE, 2 ELEMENTS |
| Diode Element Material | SILICON |
| Diode Type | RECTIFIER DIODE |
| Forward Voltage-Max (VF) | 0.82V |
| JEDEC-95 Code | TO-254AA |
| JESD-30 Code | S-MSFM-P3 |
| Non-rep Pk Forward Current-Max | 200A |
| Number of Elements | 2 |
| Number of Phases | 1 |
| Output Current-Max | 20A |
| Package Body Material | METAL |
| Package Shape | SQUARE |
| Package Style | FLANGE MOUNT |
| Reference Standard | ESA/SCC 5106/024 |
| Rep Pk Reverse Voltage-Max | 45V |
| Reverse Current-Max | 25 µA |
| Reverse Test Voltage | 45V |
| Surface Mount | NO |
| Technology | SCHOTTKY |
| Terminal Form | PIN/PEG |
| Terminal Position | SINGLE |
| Package | Transistor Outline, Vertical |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8541.10.00.80 |
| Country of Origin | France |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for STPS40A45CHYG:
Rectifier Diode, Schottky, 1 Phase, 2 Element, 20A, 45V V(RRM), Silicon, TO-254AA
Rectifier Diode, Schottky, 1 Phase, 2 Element, 20A, 45V V(RRM), Silicon, TO-254AA
Frequently Asked Questions
What are the continuous forward current and reverse voltage ratings of the STPS40A45CHYG, and how does this size it for a 28 V aircraft bus rectifier?
The STPS40A45CHYG provides 20 A continuous forward current per element with a 45 V reverse voltage rating. For a 28 V DC aircraft bus application using a full-wave center-tapped topology, each element sees half the load current, so the device can supply up to 20 A to the bus while maintaining a 17 V reverse voltage margin above the 28 V peak, well within the 45 V rating.
How does the 0.82 V forward voltage drop of STPS40A45CHYG compare to a conventional silicon PN diode at 20 A, and what does this mean for power dissipation?
A conventional silicon PN diode typically has a forward voltage of 1.0 V to 1.2 V at 20 A, compared to the STPS40A45CHYG's maximum of 0.82 V. At 20 A continuous this reduces conduction power loss by approximately 4 W to 8 W per element, which translates directly to reduced heatsink size and lower junction temperature in space- and weight-constrained aerospace assemblies.
What non-repetitive peak current can the STPS40A45CHYG handle, and why does this matter for surge protection in aerospace power designs?
The device is rated for 200 A non-repetitive peak forward current for a short surge pulse duration of approximately 10 ms. This allows the rectifier to survive inrush current spikes when large output filter capacitors charge up at power-on, or during load dump transients in aircraft bus systems, without requiring external current limiting that would otherwise add weight and component count to the power assembly.
What package does the STPS40A45CHYG use, and how does the TO-254AA footprint aid thermal management in high-current aerospace assemblies?
The TO-254AA (JEDEC-95) is a 3-pin metal flange package designed for bolt-down mounting directly to a chassis or heatsink. The large metal base provides a low thermal resistance path from the silicon junction to the mounting surface, enabling high current operation without exceeding junction temperature limits. The through-hole mounting also provides mechanical robustness against vibration and thermal cycling stress encountered in aerospace environments.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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