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Taiwan Semiconductor Corporation HERAF804G
- Part No.:
- HERAF804G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-220-2 Full Pack
- Datasheet:
-
HERAF804G.pdf
- Description:
- DIODE GEN PURP 300V 8A ITO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
HERAF804G from Taiwan Semiconductor is an AEC-Q101-qualified, glass-passivated, single-die high-efficiency rectifier in ITO-220AC package, rated for 8A average forward current, 300V repetitive peak reverse voltage (VRRM), and 150A surge current (IFSM), used in switching-mode DC/DC converters and freewheeling paths.
For engineers reviewing the HERAF804G datasheet, HERAF804G pinout, HERAF804G application, or HERAF804G equivalent, key selection factors include its 300V VRRM rating, 1.0V max forward voltage at 8A/25°C, 50ns reverse recovery time, 2°C/W junction-to-case thermal resistance, and UL recognition under file #E-326243.
Technical Context
The HERAF804G is a fast-recovery, single-diode rectifier optimized for high-frequency switching power supplies. Its 50ns trr and low 1.0V VF at 8A support high-efficiency operation in SMPS topologies where conduction and switching losses must be minimized.
Designed with glass-passivated junction and matte tin-plated leads compliant with J-STD-002, it delivers robust reliability across automotive-grade temperature range (–55°C to +150°C) and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - Maximum non-repetitive reverse voltage the device blocks reliably in circuit |
| IF(AV) | 8 A - Continuous average forward current capability at case temperature ≤ 100°C |
| IFSM | 150 A - Peak non-repetitive surge current tolerance (8.3 ms half-sine), critical for inrush handling |
| VF @ 8A, 25°C | ≤1.0 V - Low conduction loss enabling higher efficiency in high-current DC/DC stages |
| trr | ≤50 ns - Fast reverse recovery minimizes switching loss and EMI in >100 kHz converters |
| RθJC | 2 °C/W - Enables effective heatsinking with modest thermal interface design for 8A operation |
| Junction Temp | –55°C to +150°C - Supports operation in under-hood automotive and industrial environments |
Pinout & Package
Package: ITO-220AC - Insulated TO-220 variant with isolated tab, 3-terminal configuration, UL 94V-0 molding compound, and matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to input/high-side node in freewheeling or output rectification path |
| Cathode | Current exit point during forward conduction | Connected to ground or return path; polarity-marked on device body |
| Tab (isolated) | Thermal interface only - electrically isolated | Mounts to heatsink without electrical isolation barrier; enables direct thermal coupling |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option available | Validated for automotive power electronics requiring stress-tested reliability |
| Glass-passivated chip junction | Enhances moisture resistance and long-term stability under thermal cycling |
| UL Recognized (E-326243) | Meets safety standards for end-equipment certification in industrial and automotive systems |
| RoHS & halogen-free (IEC 61249-2-21) | Complies with environmental regulations for global manufacturing and disposal |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth under mechanical stress and temperature variation |
Applications
| DC/DC Converter Output Rectification | Switching Inverter Freewheeling Diode |
|---|---|
Use Scenario: Used as secondary-side synchronous or standard rectifier in isolated flyback or forward converters delivering 12–48 V outputs at up to 8 A. IC Role / Device Role / Timing Role: Unidirectional current valve converting high-frequency AC from transformer secondary into regulated DC output. Use Value: 1.0 V VF and 50 ns trr reduce conduction and switching losses, improving overall converter efficiency by ≥1.2% at full load. | Use Scenario: Placed across inductive loads (e.g., motor windings or relay coils) in H-bridge inverters operating at 20–100 kHz. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during PWM off-time to suppress voltage spikes. Use Value: 150 A IFSM withstands transient energy from inductive kickback; 300 V VRRM covers typical bus voltages up to 250 V DC. |
| Automotive On-Board Charger (OBC) Auxiliary Supply | Industrial AC-DC Front-End Rectification |
Use Scenario: Rectifies auxiliary 12 V rail derived from main OBC transformer in EV charging systems. IC Role / Device Role / Timing Role: High-reliability output rectifier supporting continuous operation under vibration, thermal cycling, and humidity. Use Value: AEC-Q101 qualification and –55°C to +150°C TJ range ensure functional integrity across automotive ambient conditions. | Use Scenario: Used in PFC boost diode position or post-PFC bulk rectification stage of 1–3 kW industrial PSUs. IC Role / Device Role / Timing Role: Handles high average current and repetitive surge events in line-frequency and high-frequency rectification. Use Value: 2°C/W RθJC allows mounting on shared heatsink with MOSFETs; UL recognition simplifies system-level safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH8R03G | Same ITO-220AC package, 8A/300V, but VF = 1.15 V (max @ 8A), trr = 60 ns | Slightly higher conduction loss; less optimized for ultra-low VF designs | Preferred when ST ecosystem alignment or dual-sourcing is required |
| VS-8EWH03FN-M3 | ITO-220AC, 8A/300V, VF = 0.97 V (typ), trr = 45 ns, but not AEC-Q101 qualified | Lacks automotive qualification; better switching performance but lower reliability assurance | Selected for cost-sensitive industrial SMPS where AEC-Q101 is unnecessary |
Compared with STTH8R03G and VS-8EWH03FN-M3, the HERAF804G offers the best balance of low VF (≤1.0 V), fast trr (≤50 ns), and optional AEC-Q101 qualification - making it optimal for automotive-grade DC/DC and high-reliability industrial converters where both efficiency and qualification matter.
Availability
HERAF804G is available at Aetrix Electronics and suitable for DC/DC converter output rectification, switching inverter freewheeling, and automotive on-board charger auxiliary supply requiring stable component supply and long-term production continuity.
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, specializing in power devices, rectifiers, TVS, and protection components.
The HERAF804G belongs to TSC's high-efficiency rectifier product line, engineered for automotive and industrial switching power supplies demanding low VF, fast recovery, and AEC-Q101 reliability validation.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) rating for HERAF804G?
The HERAF804G has a VRRM rating of 300 V, meaning it can reliably block up to 300 volts of reverse voltage in repetitive operation. This value is fixed per the device marking and datasheet Table "ABSOLUTE MAXIMUM RATINGS" - HERAF804G corresponds to the "x=4" variant in the HERAF8xG family, where x=4 maps to 300 V VRRM.
Is HERAF804G pin-compatible with other devices in the HERAF801G–HERAF808G series?
Yes, all HERAF801G through HERAF808G share identical ITO-220AC package dimensions, terminal layout, and pinout (Anode, Cathode, isolated Tab). The only differences are VRRM rating and associated parameters like VF and trr - so HERAF804G can be substituted within the same footprint if voltage and performance requirements align.
Does HERAF804G have AEC-Q101 qualification?
The base HERAF804G is not automatically AEC-Q101 qualified; qualification applies only to the HERAF804GH variant (with "H" suffix). The datasheet explicitly states "AEC-Q101 qualified available", and ordering code notes confirm "H means AEC-Q101 qualified". Always verify the full part number suffix when selecting for automotive applications.
What is the thermal resistance from junction to case (RθJC) for HERAF804G?
The HERAF804G has a typical junction-to-case thermal resistance (RθJC) of 2°C/W, as specified in the "THERMAL PERFORMANCE" section. This value enables efficient heat transfer to an external heatsink and supports sustained 8 A operation when case temperature is maintained ≤100°C per derating curves.
Can HERAF804G replace HERAF803G in a design?
HERAF804G (300 V VRRM) can replace HERAF803G (200 V VRRM) if the circuit's peak reverse voltage remains ≤300 V and thermal/mechanical constraints permit. However, VF increases slightly across the family (HERAF803G VF ≤0.95 V vs. HERAF804G ≤1.0 V), and trr remains identical (≤50 ns); no layout change is needed due to shared ITO-220AC package.
HERAF804G 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):
- 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 FAQ
1.How can I place an order for HERAF804G through Aetrix?
Please submit a Request for Quotation (RFQ) for HERAF804G 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 reliable?
The price and inventory of HERAF804G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HERAF804G is usually 5 days.
3.What payment methods are accepted for HERAF804G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HERAF804G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HERAF804G?
HERAF804G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HERAF804G 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?
For technical support, including HERAF804G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HERAF804G requirements.
6.How does Aetrix verify that HERAF804G is sourced from the original manufacturer or authorized distributors?
All HERAF804G 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 meets industry standards.
7.What is the process for return or replacement of HERAF804G?
All HERAF804G units undergo pre-shipment inspection (PSI). If there is an issue with HERAF804G, 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 part is unused and in its original packaging.
Return procedure for HERAF804G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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