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Taiwan Semiconductor Corporation HERAF801G
- Part No.:
- HERAF801G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-220-2 Full Pack
- Datasheet:
-
HERAF801G.pdf
- Description:
- 50NS, 8A, 50V, HIGH EFFICIENT RE
- Quantity:
- Payment:
- Shipping:
Inventory:8,554
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Product details
Overview
HERAF801G from Taiwan Semiconductor is a single-die, glass-passivated, AEC-Q101-qualified high-efficiency rectifier diode in ITO-220AC package, rated for 8A average forward current, 50V repetitive peak reverse voltage, and 150A surge current, used in DC-DC converters and freewheeling paths in automotive power supplies.
For engineers reviewing the HERAF801G datasheet, HERAF801G pinout, HERAF801G application, or HERAF801G equivalent, key selection criteria include its 1.0V max forward voltage at 8A/25°C, 2°C/W junction-to-case thermal resistance, 80pF junction capacitance, 50ns reverse recovery time, and UL Recognized status (E-326243) for safety-critical designs.
Technical Context
This device is a unidirectional silicon rectifier optimized for switching-mode power conversion where low conduction loss and fast recovery are required. Its glass-passivated junction ensures stable performance under thermal cycling and humidity stress, while the ITO-220AC package enables direct heatsink mounting with 0.56 N·m torque specification.
The HERAF801G operates across -55°C to +150°C junction temperature range and supports pulsed forward current up to 150A (8.3ms half-sine). Its 10µA max reverse leakage at 25°C and 400µA at 125°C confirms suitability for high-reliability automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF (Avg) | 8 A - Sustained output current capability without forced cooling in typical SMPS freewheeling paths |
| VRRM | 50 V - Maximum reverse blocking voltage; defines minimum system isolation margin in 12V–24V automotive DC-DC stages |
| VF (max) | 1.0 V @ 8A, 25°C - Low conduction loss enabling >95% efficiency in 50W–100W buck converters |
| trr (max) | 50 ns - Fast recovery minimizes switching losses and EMI in 100–500 kHz converter topologies |
| RθJC | 2 °C/W - Enables thermal design with ≤10W dissipation using standard heatsinks in engine bay applications |
| CJ | 80 pF @ 1MHz, 4V - Low junction capacitance reduces capacitive turn-on loss and improves high-frequency stability |
| IFSM | 150 A - Withstands cold-start inrush and load dump transients in automotive 12V systems |
Pinout & Package
Package: ITO-220AC - Insulated TO-220 variant with isolated tab, UL 94V-0 molding compound, matte tin-plated leads, and polarity marking per device top-side laser etch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Forward current entry point | Connected to switch node in buck/flyback secondary; requires low-inductance layout to minimize ringing |
| Cathode (Lead 2) | Forward current exit / reverse blocking terminal | Connected to output rail; serves as reference for voltage sensing and feedback networks |
| Tab (Isolated) | Thermal path only (electrically isolated) | Mounts directly to heatsink without insulator; enables 2°C/W RθJC with proper torque (≤0.56 N·m) |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Prevents moisture ingress and metallization corrosion, extending lifetime in humid under-hood environments |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and HTGB testing per JESD22-A108 |
| UL Recognition (E-326243) | Confirms compliance with UL 60747-5-1 for component-level safety in end equipment certification |
| Halogen-free (IEC 61249-2-21) | Meets RoHS and automotive ELV directive requirements for environmentally compliant manufacturing |
| JESD201 Class 2 whisker resistance | Eliminates tin whisker risk in long-life automotive modules operating >15 years |
Applications
| Automotive DC-DC Converters | Industrial Switching Inverters |
|---|---|
Use Scenario: Step-down conversion from 48V battery to 12V auxiliary rail in mild-hybrid vehicles. IC Role / Device Role / Timing Role: Freewheeling diode in synchronous buck converter secondary leg, conducting during low-side FET off-time. Use Value: 1.0V VF and 50ns trr reduce conduction and switching losses, improving system efficiency by ~1.2% at 50kHz operation. | Use Scenario: Output rectification in 3kW solar micro-inverter DC link stage. IC Role / Device Role / Timing Role: Unidirectional current path for AC line-frequency rectified output before H-bridge inversion. Use Value: 150A IFSM withstands grid fault surges; 2°C/W RθJC enables passive heatsinking in sealed enclosures. |
| Server PSU Freewheeling | Medical Power Supply Outputs |
Use Scenario: Secondary-side rectification in 80 PLUS Titanium-rated 1.5kW server power supply. IC Role / Device Role / Timing Role: High-current freewheeling path in LLC resonant converter synchronous rectification stage. Use Value: 8A IF rating and 80pF CJ support high-frequency operation up to 700kHz with minimal capacitive loss. | Use Scenario: Isolated DC output rectification in Class II medical AC-DC adapters (60601-1 compliant). IC Role / Device Role / Timing Role: Primary rectifier in double-insulated, reinforced-isolation secondary winding. Use Value: UL Recognition E-326243 and halogen-free construction satisfy safety and environmental requirements for patient-connected devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-8EWH05FN-M3 | Same ITO-220AC package, 50V VRRM, but 1.1V VF (max) at 8A and 60ns trr | Slightly higher conduction loss; not AEC-Q101 qualified | Preferred for cost-sensitive industrial PSUs where automotive qualification is unnecessary |
| ON Semiconductor MUR850EG | TO-220AC package (non-isolated tab), 50V VRRM, 1.7V VF (max), 75ns trr | Higher VF increases thermal load; tab is electrically connected to cathode | Acceptable for non-isolated, lower-efficiency designs where heatsink isolation is not required |
Compared with VS-8EWH05FN-M3 and MUR850EG, the HERAF801G delivers lower forward voltage and faster recovery while maintaining AEC-Q101 qualification and electrically isolated tab-critical for automotive and safety-isolated systems requiring UL recognition and long-term reliability.
Availability
HERAF801G is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial switching inverters, and medical power supply outputs requiring stable component supply with full traceability and long-lifecycle support.
Supply support for HERAF801G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power rectifiers, TVS diodes, and MOSFETs for automotive and industrial markets.
The HERAF series targets high-reliability power conversion applications, with design focus on low VF, fast trr, and robust packaging for under-hood and harsh-environment deployment.
FAQ
What is the maximum junction temperature rating for HERAF801G?
The HERAF801G has a maximum junction temperature (TJ MAX) of +150°C, verified per absolute maximum ratings table. This allows continuous operation in engine compartment environments when mounted on an appropriately sized heatsink with ≤2°C/W total thermal resistance. Derating curves in the datasheet confirm 8A average current is sustainable up to 100°C case temperature.
Is HERAF801G pin-compatible with other parts in the HERAF80xG family?
No-while all HERAF80xG parts share the same ITO-220AC package and pinout, HERAF801G is specifically rated for 50V VRRM and optimized for low VF (1.0V max), whereas higher-voltage variants like HERAF804G (300V) exhibit higher VF (1.0V) and different trr/CJ values. Electrical substitution requires validation against system voltage and loss budgets.
Does HERAF801G require a thermal pad or insulator when mounted to a heatsink?
No-HERAF801G uses an ITO-220AC package with electrically isolated tab, so direct metal-to-metal mounting to the heatsink is permitted without thermal pads or insulators. Mounting torque must not exceed 0.56 N·m to avoid package cracking, and the tab remains at cathode potential only if no external bias is applied.
What is the reverse leakage current specification for HERAF801G at elevated temperature?
HERAF801G specifies 10 µA maximum reverse current (IR) at 25°C and rated VR, rising to 400 µA maximum at 125°C. This behavior is confirmed in the electrical specifications table and supports reliable operation in high-ambient-temperature automotive applications where junction temperatures routinely reach 125°C.
Is HERAF801G suitable for use in synchronous rectification circuits?
HERAF801G is a standard PN junction rectifier-not a Schottky or MOSFET-based synchronous rectifier-so it cannot replace active synchronous rectifiers in zero-voltage-switching topologies. However, it is widely deployed as the freewheeling diode in non-synchronous buck, flyback, and forward converters where its 50ns trr and low VF provide optimal trade-off between cost and efficiency.
HERAF801G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-220-2 Full Pack
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 8A
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 8 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 50 V
- Capacitance @ Vr, F:
- 80pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ITO-220AC
- Operating Temperature - Junction:
- -55°C ~ 150°C
HERAF801G FAQ
1.How can I place an order for HERAF801G through Aetrix?
Please submit a Request for Quotation (RFQ) for HERAF801G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for HERAF801G reliable?
The price and inventory of HERAF801G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HERAF801G is usually 5 days.
3.What payment methods are accepted for HERAF801G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HERAF801G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HERAF801G?
HERAF801G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HERAF801G order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for HERAF801G?
For technical support, including HERAF801G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HERAF801G requirements.
6.How does Aetrix verify that HERAF801G is sourced from the original manufacturer or authorized distributors?
All HERAF801G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that HERAF801G meets industry standards.
7.What is the process for return or replacement of HERAF801G?
All HERAF801G units undergo pre-shipment inspection (PSI). If there is an issue with HERAF801G, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The HERAF801G part is unused and in its original packaging.
Return procedure for HERAF801G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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