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Taiwan Semiconductor Corporation HERA804G
- Part No.:
- HERA804G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-220-2
- Datasheet:
-
HERA804G.pdf
- Description:
- DIODE GEN PURP 300V 8A TO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
HERA804G from Taiwan Semiconductor is a high-efficiency, glass-passivated single-die silicon rectifier diode in TO-220AC package, rated for 300 V repetitive peak reverse voltage (VRRM), 8 A average forward current (IF), and 150 A non-repetitive surge current (IFSM), used in freewheeling and switching-mode power supply output stages.
For engineers reviewing the HERA804G datasheet, HERA804G pinout, HERA804G application, or HERA804G equivalent, key selection criteria include its 300 V VRRM rating, 1.0 V max forward voltage at 8 A/25°C, 50 ns reverse recovery time, 65 pF junction capacitance, and AEC-Q101 qualification availability in the 'H' variant.
Technical Context
The HERA804G is a unidirectional, single-junction, planar passivated fast recovery rectifier optimized for high-frequency switching converters. Its 300 V VRRM and 50 ns trr support efficient operation in 100–500 kHz SMPS topologies where low conduction loss and controlled reverse recovery are critical.
Thermally, it features a 2 °C/W junction-to-case thermal resistance and operates across –55°C to +150°C junction temperature range. The TO-220AC package enables direct heatsink mounting with ≤0.56 N·m torque, supporting sustained 8 A conduction under forced-air or moderate heatsink conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - Maximum repetitive reverse blocking voltage; defines usable DC bus or output voltage headroom in buck/flyback secondary side |
| IF | 8 A - Continuous average forward current at TC = 100°C; sets minimum heatsink requirement for steady-state operation |
| IFSM | 150 A - Non-repetitive surge rating (8.3 ms half-sine); withstands inrush and fault currents without bond-wire failure |
| VF (max) | 1.0 V @ 8 A, 25°C - Low conduction loss improves efficiency in high-current output rectification |
| trr | 50 ns - Fast reverse recovery minimizes switching losses and EMI in high-frequency converters |
| CJ | 65 pF @ 1 MHz, 4 V - Low junction capacitance reduces capacitive turn-on loss and noise coupling |
| RθJC | 2 °C/W - Enables thermal design with predictable case-to-heatsink temperature rise under full load |
Pinout & Package
TO-220AC package: 3-lead, single-diode configuration with anode (lead 1), cathode (lead 2), and electrically connected tab (cathode). Mounting tab is cathode-connected and requires electrical isolation when heatsink-mounted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode | Input terminal for forward conduction; connects to transformer secondary or switch node in freewheel path |
| Lead 2 | Cathode | Output terminal; ties to output rail or ground return in standard rectifier orientation |
| Tab (center) | Cathode | Internally bonded to lead 2; provides primary thermal path and must be isolated if mounted to grounded heatsink |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances humidity resistance and long-term reliability in automotive and industrial environments |
| AEC-Q101 qualified option (HERA804GH) | Validated for automotive under-hood applications including engine control and ADAS power supplies |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 and EU RoHS directives for environmentally constrained deployments |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth on matte tin-plated leads, ensuring long-term solder joint integrity |
Applications
| DC–DC Converter Output Rectification | Switching Inverter Freewheeling |
|---|---|
Use Scenario: Secondary-side rectification in isolated 48 V–300 V input DC–DC converters delivering up to 8 A continuous output. IC Role / Device Role / Timing Role: Unidirectional power conversion element conducting during positive half-cycle of transformer secondary voltage. Use Value: 1.0 V VF and 50 ns trr reduce conduction and switching losses, improving overall converter efficiency by ~1.2% at 200 kHz. | Use Scenario: Freewheeling path in H-bridge motor inverters driving 3-phase BLDC or induction motors up to 1 kW. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during PWM off-time to maintain continuous motor current. Use Value: 150 A IFSM withstands motor startup surges; 300 V VRRM supports 270 V DC bus with 10% margin. |
| Industrial SMPS Power Supply | Automotive On-Board Charger (OBC) Auxiliary Supply |
Use Scenario: Primary or secondary rectification in 500 W industrial AC–DC power supplies operating at 100–250 VAC input. IC Role / Device Role / Timing Role: High-current output rectifier handling continuous 8 A load with minimal thermal derating. Use Value: 2 °C/W RθJC enables compact heatsinking; –55°C to +150°C TJ range supports operation in enclosed enclosures. | Use Scenario: Auxiliary 12 V/5 V isolated supply rectifier in AEC-Q101-compliant OBC systems. IC Role / Device Role / Timing Role: Secondary-side rectifier in flyback or forward converter powering gate drivers and MCU rails. Use Value: HERA804GH variant satisfies automotive qualification; 10 µA IR at 25°C ensures low standby leakage. |
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 | 300 V VRRM, 8 A IF, 1.15 V VF (max @ 8 A), 60 ns trr, TO-220AC | Slightly higher VF increases conduction loss; same package and pinout | Preferred where ST ecosystem alignment or dual-sourcing is required; verify thermal margin due to higher VF |
| ON Semi MUR830 | 300 V VRRM, 8 A IF, 1.25 V VF (max @ 8 A), 75 ns trr, TO-220AC | Slower recovery and higher VF reduce efficiency in >150 kHz designs | Suitable for cost-sensitive industrial supplies below 100 kHz; not recommended for high-frequency OBC auxiliary rails |
Compared with STTH8R03G and MUR830, the HERA804G delivers lower forward voltage and faster recovery-critical for efficiency-critical 200+ kHz converters-while maintaining identical TO-220AC mechanical fit and cathode-tab pinout.
Availability
HERA804G is available at Aetrix Electronics and suitable for DC–DC converters, switching inverters, and industrial SMPS requiring stable component supply with consistent parametric performance across production lots.
Supply support for HERA804G 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 diodes, and MOSFETs since 1979.
The HERA804G belongs to TSC's high-efficiency rectifier product line, engineered for high-reliability power conversion in automotive, industrial, and computing applications where low VF, fast trr, and robust thermal performance are essential.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) for HERA804G?
The HERA804G has a VRRM rating of 300 V, meaning it can reliably block up to 300 V of reverse voltage in repetitive operation. This value is fixed per the device's marking and datasheet specification-HERA804G is the 300 V member of the HERA801G–HERA808G family. Exceeding this voltage risks avalanche breakdown and permanent damage to the HERA804G.
Is HERA804G pin-compatible with other TO-220AC rectifiers like MUR830 or STTH8R03G?
Yes, the HERA804G uses the standard TO-220AC outline with cathode-connected tab (lead 2 and tab), matching the pinout of MUR830 and STTH8R03G. All three have anode (lead 1), cathode (lead 2), and cathode tab-enabling direct mechanical replacement. However, electrical differences in VF and trr require validation in the target circuit before substitution.
What is the forward voltage (VF) specification for HERA804G at full rated current?
The HERA804G has a maximum forward voltage of 1.0 V at 8 A forward current and 25°C junction temperature, per the datasheet's Electrical Specifications table. This is measured under pulsed conditions (PW = 0.3 ms) to avoid self-heating. At elevated temperatures or DC operation, VF decreases slightly but thermal design must ensure TJ stays within –55°C to +150°C limits for reliable HERA804G operation.
Does HERA804G meet automotive qualification standards?
The base HERA804G is not AEC-Q101 qualified, but the HERA804GH variant-identical in all electrical and mechanical specs except qualification-is fully AEC-Q101 certified. HERA804GH undergoes stress testing per AEC-Q101 Rev D, including HTSL, TC, and UHAST, making it suitable for automotive power supply modules where qualification is mandatory.
What thermal resistance does HERA804G exhibit from junction to case?
The HERA804G has a typical junction-to-case thermal resistance (RθJC) of 2 °C/W, as specified in the Thermal Performance section. This value enables accurate heatsink sizing: for example, at 8 A conduction with 1.0 V VF, power dissipation is ~8 W, resulting in a 16°C temperature rise from case to junction-assuming ideal case-to-heatsink interface. This RθJC applies only when mounted per spec with ≤0.56 N·m torque.
HERA804G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-220-2
- 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:
- 65pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AC
- Operating Temperature - Junction:
- -55°C ~ 150°C
HERA804G FAQ
1.How can I place an order for HERA804G through Aetrix?
Please submit a Request for Quotation (RFQ) for HERA804G 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 HERA804G reliable?
The price and inventory of HERA804G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HERA804G is usually 5 days.
3.What payment methods are accepted for HERA804G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HERA804G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HERA804G?
HERA804G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HERA804G 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 HERA804G?
For technical support, including HERA804G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HERA804G requirements.
6.How does Aetrix verify that HERA804G is sourced from the original manufacturer or authorized distributors?
All HERA804G 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 HERA804G meets industry standards.
7.What is the process for return or replacement of HERA804G?
All HERA804G units undergo pre-shipment inspection (PSI). If there is an issue with HERA804G, 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 HERA804G part is unused and in its original packaging.
Return procedure for HERA804G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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