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Taiwan Semiconductor Corporation HERAF804G C0G
- Part No.:
- HERAF804G C0G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-220-2 Full Pack
- Datasheet:
-
HERAF804G C0G.pdf
- Description:
- DIODE GEN PURP 300V 8A ITO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,241
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Product details
Overview
HERAF804G from Taiwan Semiconductor is an 8A, 300V glass-passivated high-efficiency fast recovery rectifier in ITO-220AC package, featuring 1.0V max forward voltage at 8A/25°C, 50ns reverse recovery time, and 80pF junction capacitance - deployed in DC-DC converters and switching inverters.
For engineers reviewing the HERAF804G datasheet, HERAF804G pinout, HERAF804G application, or HERAF804G equivalent, key selection criteria include VRRM = 300V, IF = 8A, trr = 50ns, RθJC = 2°C/W, and AEC-Q101 qualification availability (HERAF804GH variant).
Technical Context
This single-die fast recovery rectifier uses a glass-passivated PN junction to achieve low conduction loss and controlled reverse recovery behavior. Its 50ns trr and 1.0V VF at rated current support high-frequency switching up to ~100 kHz in hard-switched topologies.
The ITO-220AC package provides direct case-to-heatsink thermal path with RθJC = 2°C/W and supports mounting torque up to 0.56 N·m. Polarity is marked on device body; terminals are matte tin-plated per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - maximum repetitive reverse blocking voltage; defines usable input voltage range in flyback or boost stages |
| IF | 8 A - average forward current rating at TC = 110°C; determines continuous power handling in freewheeling paths |
| trr | 50 ns - measured at IF = 0.5A, IR = 1.0A, Irr = 0.25A; enables efficient operation in 50–100 kHz SMPS designs |
| VF | ≤1.0 V @ 8A, 25°C - low conduction loss reduces thermal stress and improves system efficiency at full load |
| CJ | 80 pF @ 1 MHz, 4V - junction capacitance impacts EMI and snubber design in high-dv/dt switching nodes |
| RθJC | 2 °C/W - thermal resistance from junction to case; enables direct heatsink mounting without thermal interface material for compact layouts |
Pinout & Package
ITO-220AC package: 3-terminal through-hole outline with isolated tab (cathode), anode lead, and cathode lead - tab electrically connected to cathode; polarity marked on device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Tab (marked side) | Cathode | Electrically connected to cathode; serves as primary heat dissipation surface and must be mounted to heatsink |
| Lead 1 (left) | Anode | Input terminal for forward current flow; connects to switching node or transformer secondary |
| Lead 2 (right) | Cathode | Output terminal; ties to output rail or ground return path in freewheeling configuration |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enhances humidity resistance and long-term reliability under thermal cycling and high-humidity environments |
| UL Recognized (E-326243) | Validates safety compliance for end-equipment certification in industrial and automotive power supplies |
| AEC-Q101 qualified option (HERAF804GH) | Supports automotive-grade deployment in engine control modules and ADAS power rails where qualification is mandatory |
| Halogen-free (IEC 61249-2-21) | Meets environmental compliance requirements for RoHS and WEEE-regulated markets without compromising flame retardancy |
Applications
| DC-DC Converters | Switching Inverters |
|---|---|
Use Scenario: Secondary-side rectification in isolated 48V–300V input DC-DC converters for telecom and server PSUs. IC Role / Device Role / Timing Role: Fast recovery rectifier conducting during transformer reset phase; replaces slower diodes to reduce switching losses. Use Value: 50ns trr and 1.0V VF cut conduction + recovery losses by ~18% vs. standard FRD at 8A/100kHz, improving full-load efficiency. | Use Scenario: Output stage rectification in 3-phase motor drive inverters with 300V DC bus. IC Role / Device Role / Timing Role: Freewheeling diode clamping inverter leg voltage spikes during IGBT turn-off. Use Value: 150A IFSM withstands motor startup surges; 2°C/W RθJC allows direct heatsink mounting without thermal pads in space-constrained drives. |
| Freewheeling Circuits | Industrial SMPS |
Use Scenario: Inductive load flyback protection in solenoid drivers and relay interfaces. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path when inductive load is de-energized. Use Value: 300V VRRM safely blocks back-EMF spikes up to 300V; 80pF CJ minimizes capacitive coupling noise into control circuitry. | Use Scenario: Primary-side auxiliary supply and secondary-side output rectification in DIN-rail mounted industrial PSUs. IC Role / Device Role / Timing Role: High-reliability rectifier operating continuously at 8A with ambient temperatures up to 70°C. Use Value: UL recognition and JESD201 Class 2 whisker resistance ensure field longevity in 24/7 factory automation equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH8R03CW | VRRM = 300V, IF = 8A, trr = 45ns, TO-220AC package, no AEC-Q101 option | Lower trr but lacks automotive qualification and UL recognition | Select when ultra-fast recovery is prioritized over safety certification and automotive compliance |
| VS-8EWH03FN-M3 | VRRM = 300V, IF = 8A, trr = 55ns, ITO-220AC, AEC-Q101 qualified, RoHS/halogen-free | Marginally slower recovery but identical qualification and environmental compliance | Choose when supply chain diversification is needed with matched automotive and safety specs |
Compared with STTH8R03CW and VS-8EWH03FN-M3, HERAF804G offers balanced performance: identical VRRM/IF, mid-range trr, plus UL recognition and optional AEC-Q101 - making it optimal for industrial SMPS requiring both safety certification and automotive-ready variants.
Availability
HERAF804G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and freewheeling circuits requiring stable component supply across industrial, telecom, and automotive auxiliary power designs.
Supply support for HERAF804G 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, serving global industrial, automotive, and consumer markets since 1979.
The HERAF series targets high-efficiency power conversion in cost-sensitive, high-volume applications - designed specifically for fast recovery rectification in 50–100 kHz switching power supplies with emphasis on thermal robustness and regulatory compliance.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) of HERAF804G?
The HERAF804G has a VRRM of 300 V, as specified in the Absolute Maximum Ratings table. This value is fixed per the part numbering scheme (HERAF80xG → x=4 → 300V). It defines the highest reverse voltage the device can block repeatedly without breakdown under normal operating conditions.
Is HERAF804G suitable for automotive applications?
Yes - the HERAF804GH variant is AEC-Q101 qualified and meets JESD201 Class 2 whisker resistance. While HERAF804G itself is not automatically qualified, the 'H' suffix denotes the automotive-grade version. Engineers selecting for automotive use must specify HERAF804GH to ensure compliance.
What is the forward voltage (VF) of HERAF804G at full rated current?
HERAF804G exhibits a maximum forward voltage of 1.0 V at IF = 8 A and TJ = 25°C, per the Electrical Specifications table. This value increases with junction temperature and is typical for high-efficiency fast recovery rectifiers in the ITO-220AC package.
Does HERAF804G have UL recognition?
Yes - HERAF804G is UL Recognized under File # E-326243. This applies to the entire HERAF801G–HERAF808G family and validates its suitability for end-equipment safety certification in North America and other UL-aligned markets.
What is the thermal resistance from junction to case (RθJC) for HERAF804G?
The junction-to-case thermal resistance of HERAF804G is 2°C/W, as stated in the Thermal Performance section. This low value is enabled by the ITO-220AC package's metal tab construction and supports direct heatsink mounting without thermal interface material in thermally constrained designs.
HERAF804G C0G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-220-2 Full Pack
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 300 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 @ 300 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
HERAF804G C0G FAQ
1.How can I place an order for HERAF804G C0G through Aetrix?
Please submit a Request for Quotation (RFQ) for HERAF804G C0G 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 HERAF804G C0G reliable?
The price and inventory of HERAF804G C0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HERAF804G C0G is usually 5 days.
3.What payment methods are accepted for HERAF804G C0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HERAF804G C0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HERAF804G C0G?
HERAF804G C0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HERAF804G C0G 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 HERAF804G C0G?
For technical support, including HERAF804G C0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HERAF804G C0G requirements.
6.How does Aetrix verify that HERAF804G C0G is sourced from the original manufacturer or authorized distributors?
All HERAF804G C0G 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 HERAF804G C0G meets industry standards.
7.What is the process for return or replacement of HERAF804G C0G?
All HERAF804G C0G units undergo pre-shipment inspection (PSI). If there is an issue with HERAF804G C0G, 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 HERAF804G C0G part is unused and in its original packaging.
Return procedure for HERAF804G C0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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