PFR856S STMicroelectronics Integrated Circuit (Diodes, Axial Diameter Horizontal Mounting) In Stock
The PFR856S is a STMicroelectronics silicon fast recovery rectifier diode rated for high-current applications, featuring a maximum forward voltage of 1.25 V in a DO-201AD axial package. It operates as a single isolated element and is specified for freewheeling and fast recovery rectification circuits. Available from stock worldwide with competitive pricing.
- Manufacturer
- STMicroelectronics
- Package
- Diodes, Axial Diameter Horizontal Mounting
- Pin Count
- 2
- Lifecycle
- OBSOLETE
- Datasheet
- PFR856S Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 175.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of PFR856S?
- Fast recovery rectifier with 1.25 V maximum forward voltage and silicon construction suits high-frequency switching and freewheeling applications
- DO-201AD axial package with isolated case connection allows direct heatsink mounting for improved thermal management in high-power circuits
- Single-element configuration with JEDEC DO-201AD standardized body simplifies drop-in replacement and procurement across multiple approved suppliers
What is PFR856S used for?
The PFR856S is used as a freewheeling diode across inductive loads in motor drive circuits, relay coil protection, and DC-DC converter secondary rectification stages where fast recovery time reduces switching losses. Its axial DO-201AD package and isolated case allow flexible PCB or chassis-mount installation with heatsinking in power electronics assemblies rated for higher current. Industrial power supplies, UPS rectifier bridges, and welding equipment output stages also rely on this device for efficient and reliable rectification.
What are the specifications of PFR856S?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Additional Feature | FREE WHEELING DIODE |
| Application | FAST RECOVERY |
| Case Connection | ISOLATED |
| Configuration | SINGLE |
| Diode Element Material | SILICON |
| Diode Type | RECTIFIER DIODE |
| Forward Voltage-Max (VF) | 1.25V |
| JEDEC-95 Code | DO-201AD |
| JESD-30 Code | O-PALF-W2 |
| JESD-609 Code | e3 |
| Non-rep Pk Forward Current-Max | 100A |
| Number of Elements | 1 |
| Number of Phases | 1 |
| Output Current-Max | 3A |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | ROUND |
| Package Style | LONG FORM |
| Power Dissipation-Max | 3.5W |
| Qualification Status | Not Qualified |
| Rep Pk Reverse Voltage-Max | 600V |
| Reverse Recovery Time-Max | 0.2 µs |
| Surface Mount | NO |
| Terminal Finish | MATTE TIN |
| Terminal Form | WIRE |
| Terminal Position | AXIAL |
| Package | Diodes, Axial Diameter Horizontal Mounting |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8541.10.00.80 |
Where can I find the PFR856S datasheet?
PFR856S Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for PFR856S?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the maximum forward voltage of the PFR856S, and how does it affect power dissipation in a rectifier bridge?
The PFR856S has a maximum forward voltage of 1.25 V, which means at 8 A forward current, it dissipates up to 10 W per device in a full-bridge configuration. Selecting diodes with lower forward voltage reduces junction heating and improves overall rectifier efficiency, so the PFR856S is best suited to applications where fast recovery is prioritized over ultra-low conduction loss.
For a DC motor freewheeling circuit, why is the fast recovery specification of the PFR856S important at switching frequencies above 10 kHz?
At switching frequencies above 10 kHz, a standard slow-recovery rectifier diode would conduct reverse current during its long reverse-recovery period, increasing switching losses and heating. The PFR856S fast recovery characteristic significantly reduces this reverse-recovery charge, limiting dissipated energy per switching cycle and preventing excessive junction temperature rise in motor drive IGBT or MOSFET snubber circuits.
How does the DO-201AD axial package of the PFR856S support heatsink mounting compared to SMD diode packages?
The DO-201AD axial package uses an isolated case connection with a larger body than typical surface-mount diodes, allowing a clip-on or bolt-down heatsink to be attached directly to the cylindrical case. This reduces thermal resistance to ambient by 30–50% compared to a PCB-only mounted SMD device, enabling the PFR856S to handle higher continuous current without exceeding junction temperature limits.
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Why Buy from FindMyChip
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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