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Taiwan Semiconductor Corporation HERAF805G C0G
- Part No.:
- HERAF805G C0G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-220-2 Full Pack
- Datasheet:
-
HERAF805G C0G.pdf
- Description:
- DIODE GEN PURP 400V 8A ITO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,828
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Product details
Overview
HERAF805G from Taiwan Semiconductor is a glass-passivated, single-die, 8A/400V high-efficiency fast recovery rectifier in ITO-220AC package, featuring 1.3V forward voltage at 8A and 50ns reverse recovery time, used in DC-DC converters and switching inverters.
For engineers reviewing the HERAF805G datasheet, HERAF805G pinout, HERAF805G application, or HERAF805G equivalent, key selection criteria include VRRM = 400V, IF = 8A, trr = 50ns, RθJC = 2°C/W, and AEC-Q101 qualification availability (HERAF805GH variant).
Technical Context
This device employs a planar epitaxial silicon junction with glass passivation for enhanced moisture resistance and thermal stability. Its fast recovery (trr ≤ 50ns) and low forward voltage (VF ≤ 1.3V @ 8A, 25°C) support high-frequency switching in SMPS topologies.
The ITO-220AC package provides direct case-to-heatsink thermal conduction (RθJC = 2°C/W), enabling reliable operation up to TJ = 150°C. Junction capacitance is 80pF at 4V reverse bias and 1MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Maximum repetitive reverse blocking voltage; defines usable input voltage range in bridge or freewheeling configurations |
| IF | 8 A - Continuous average forward current; determines heatsink sizing and conduction loss budget |
| trr | 50 ns - Reverse recovery time; limits minimum switching frequency and reduces switching losses in hard-switched converters |
| VF | 1.3 V @ 8A, 25°C - Forward voltage drop; directly impacts conduction loss (Pcond ≈ IF × VF) |
| RθJC | 2 °C/W - Junction-to-case thermal resistance; enables direct heatsink mounting without thermal interface material for compact thermal design |
| CJ | 80 pF @ 4V, 1MHz - Junction capacitance; affects high-frequency EMI and snubber design in flyback or LLC resonant circuits |
Pinout & Package
Package: ITO-220AC - Insulated TO-220 variant with electrically isolated tab (non-conductive mounting surface), matte tin-plated leads, UL 94V-0 molding compound, and 1.70g mass. Mounting torque ≤ 0.56 N·m.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Forward current entry point | Connected to input/high-side node in freewheeling or output rectification paths |
| Cathode (Lead 2) | Forward current exit point | Connected to ground/common return or output capacitor negative terminal |
| Case / Tab | Electrically isolated thermal path | Provides mechanical mounting and thermal dissipation without electrical connection; requires insulating washer if mounted to grounded heatsink |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Prevents moisture ingress and metallization corrosion, extending lifetime in humid or automotive under-hood environments |
| Fast recovery (50 ns) | Reduces switching loss and EMI generation in 100–500 kHz SMPS designs compared to standard rectifiers (>500 ns) |
| Low VF (1.3 V) | Lowers conduction loss by ~15% versus typical 1.5V rectifiers at 8A, improving efficiency in high-current DC-DC stages |
| AEC-Q101 qualified option | HERAF805GH variant meets stress test requirements for automotive power electronics including temperature cycling and HTRB |
| UL Recognized (E-326243) | Validates safety compliance for end-equipment certification in industrial and consumer power supplies |
Applications
| DC-DC Converters | Switching Inverters |
|---|---|
Use Scenario: Secondary-side synchronous rectification in isolated 48V-to-12V buck-derived converters for telecom and server PSUs. IC Role / Device Role / Timing Role: High-current output rectifier handling continuous 8A load with minimal conduction loss and fast turn-off to prevent shoot-through. Use Value: 1.3V VF and 50ns trr reduce total power loss by ≥0.8W vs. legacy 1N5408, improving thermal margin at full load. | Use Scenario: DC link freewheeling path in three-phase motor drives operating at 10–20 kHz PWM frequency. IC Role / Device Role / Timing Role: Unidirectional current clamp during inductive kickback, requiring robust surge capability and low stored charge. Use Value: 150A IFSM withstands motor startup surges; 80pF CJ minimizes capacitive coupling noise into gate drivers. |
| Freewheeling Diodes | Industrial SMPS |
Use Scenario: Flyback diode across solenoid valves and relay coils in PLC I/O modules. IC Role / Device Role / Timing Role: Energy recirculation path during coil de-energization, demanding fast recovery to limit voltage overshoot. Use Value: 50ns trr limits peak reverse voltage to <1.2× supply, eliminating need for TVS clamping in 24V systems. | Use Scenario: Output rectification in 300W open-frame AC-DC power supplies for factory automation controllers. IC Role / Device Role / Timing Role: Primary high-current rectifier in dual-output forward converter with active clamp reset. Use Value: RθJC = 2°C/W allows direct heatsink mounting on aluminum chassis, reducing BOM cost vs. insulated-mount alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH8R04DJF | VRRM = 400V, IF = 8A, trr = 35ns, VF = 1.25V @ 8A - faster but lower surge rating (IFSM = 120A) | Preferred in ultra-high-frequency (>300 kHz) PFC stages where trr dominates loss; less suitable for high-surge motor drive freewheeling | Select when minimizing switching loss outweighs surge margin; verify layout for higher dV/dt sensitivity |
| VS-8EWH04FN-M3 | VRRM = 400V, IF = 8A, trr = 60ns, VF = 1.35V @ 8A - slightly slower and higher VF, but AEC-Q101 qualified as standard | Better fit for automotive body control modules requiring full qualification without part number suffix change | Choose when AEC-Q101 compliance is mandatory and 5ns trr/0.05V VF trade-off is acceptable |
Compared with STTH8R04DJF and VS-8EWH04FN-M3, HERAF805G offers balanced trr/VF performance and superior surge robustness (150A IFSM), making it optimal for industrial SMPS and motor drive freewheeling where reliability under transient overload is critical.
Availability
HERAF805G 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 HERAF805G 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 since 1979.
The HERAF series targets high-reliability industrial and automotive power conversion, designed specifically for efficient, thermally robust rectification in space-constrained, high-temperature environments.
FAQ
What is the maximum junction temperature rating for HERAF805G?
The HERAF805G has a maximum junction temperature (TJ) of +150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet (Version K2105). This rating applies under continuous operation with proper heatsinking and ensures long-term reliability in industrial ambient conditions up to +85°C case temperature when RθJC = 2°C/W is maintained. HERAF805G must not exceed this limit during transient or steady-state operation.
Is HERAF805G pin-compatible with other devices in the HERAF80xG family?
Yes, all HERAF801G through HERAF808G share identical ITO-220AC packaging, pinout, and mechanical footprint - Anode (Lead 1), Cathode (Lead 2), and electrically isolated tab. Voltage ratings differ only in internal die design; no PCB layout change is required when substituting within the family, provided thermal and surge margins remain adequate for the new VRRM rating.
Does HERAF805G meet automotive qualification standards?
The base HERAF805G is not AEC-Q101 qualified; however, the HERAF805GH variant - indicated by the "H" suffix in the ordering code - is fully AEC-Q101 qualified per Taiwan Semiconductor's documentation. HERAF805GH undergoes extended stress testing including temperature cycling, high-temperature reverse bias, and unbiased highly accelerated stress testing for automotive power module applications.
What is the reverse recovery time (trr) specification for HERAF805G?
The HERAF805G has a maximum reverse recovery time (trr) of 50 ns, measured under conditions of IF = 0.5 A, IR = 1.0 A, and IRR = 0.25 A, per the official Taiwan Semiconductor datasheet (Version K2105, page 2). This value is confirmed for the HERAF805G die variant and distinguishes it from higher-voltage variants (HERAF806G–808G), which specify 80 ns.
How does the junction capacitance of HERAF805G affect high-frequency circuit design?
HERAF805G exhibits a typical junction capacitance (CJ) of 80 pF at 4.0 V reverse bias and 1 MHz, per datasheet page 2. This value influences snubber network sizing and EMI filter design in high-frequency SMPS; higher CJ increases displacement current during voltage transitions, potentially raising common-mode noise. Designers should model CJ in SPICE simulations when optimizing gate drive isolation or EMI compliance above 100 kHz.
HERAF805G 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):
- 400 V
- Current - Average Rectified (Io):
- 8A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 8 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 400 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
HERAF805G C0G FAQ
1.How can I place an order for HERAF805G C0G through Aetrix?
Please submit a Request for Quotation (RFQ) for HERAF805G 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 HERAF805G C0G reliable?
The price and inventory of HERAF805G C0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HERAF805G C0G is usually 5 days.
3.What payment methods are accepted for HERAF805G C0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HERAF805G C0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HERAF805G C0G?
HERAF805G C0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HERAF805G 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 HERAF805G C0G?
For technical support, including HERAF805G C0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HERAF805G C0G requirements.
6.How does Aetrix verify that HERAF805G C0G is sourced from the original manufacturer or authorized distributors?
All HERAF805G 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 HERAF805G C0G meets industry standards.
7.What is the process for return or replacement of HERAF805G C0G?
All HERAF805G C0G units undergo pre-shipment inspection (PSI). If there is an issue with HERAF805G 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 HERAF805G C0G part is unused and in its original packaging.
Return procedure for HERAF805G C0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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