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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation HERA805G

Name: HERA805G
Brand: Taiwan Semiconductor Corporation
SKU: HERA805G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HERA805G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: TO-220-2

Datasheet:: HERA805G.pdf

Description:: DIODE GEN PURP 400V 8A TO220AC

Quantity:: RFQ Add To RFQ list

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Inventory:1,000

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Product details

Overview

HERA805G from Taiwan Semiconductor is a high-efficiency, glass-passivated single-die silicon rectifier diode in TO-220AC package, rated for 8 A average forward current, 400 V repetitive peak reverse voltage (V_RRM), and 150 A surge current. It delivers low forward voltage (1.3 V at 8 A, 25°C) and fast recovery (50 ns), making it suitable for freewheeling and switching-mode DC/DC converters in industrial power supplies.

For engineers reviewing the HERA805G datasheet, HERA805G pinout, HERA805G application, or HERA805G equivalent, key selection criteria include its 400 V V_RRM, 1.3 V V_F at full load, 50 ns t_rr, TO-220AC thermal resistance (2 °C/W), and AEC-Q101 qualification availability (HERA805GH variant).

Technical Context

The HERA805G operates as a unidirectional power rectifier with a single PN junction, optimized for high-frequency switching applications. Its glass-passivated chip junction ensures stable performance under thermal cycling and humidity stress, while the TO-220AC package provides direct heatsink mounting and low thermal resistance (R_θJC = 2 °C/W).

Electrical behavior is defined by a 400 V blocking rating (V_RRM), 1.3 V forward drop at 8 A/25°C, 50 ns reverse recovery time under standardized test conditions (I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A), and leakage current ≤10 µA at 25°C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Maximum non-repetitive reverse voltage the device blocks reliably in circuit
I_F	8 A - Continuous average forward current capability at case temperature ≤75°C
I_FSM	150 A - Peak non-repetitive surge current (8.3 ms half-sine) without damage
V_F	1.3 V @ 8 A, 25°C - Forward conduction loss directly impacts efficiency in high-current paths
t_rr	50 ns - Fast recovery minimizes switching losses and EMI in SMPS freewheeling paths
R_θJC	2 °C/W - Enables effective thermal management when mounted to heatsink
Junction Temp	−55°C to +150°C - Operational range supports industrial and automotive under-hood environments

Pinout & Package

TO-220AC package: 3-lead, single-ended anode-cathode configuration with isolated metal tab (cathode-connected). Mounting hole centered on tab; leads are matte tin-plated per J-STD-002. Polarity marked on top surface.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Input current entry point	Connected to AC or switching node side of rectification path
Cathode (Lead 2)	Output current exit point	Connected to output capacitor or load; electrically tied to metal tab
Metal Tab	Cathode terminal / Thermal path	Provides low-resistance heat conduction to heatsink; must be insulated if cathode is not chassis-ground referenced

Key Features

Feature	Design Value
Glass-passivated junction	Enhances long-term reliability and moisture resistance without requiring conformal coating
Low V_F (1.3 V @ 8 A)	Reduces conduction losses and thermal stress in high-current DC/DC outputs
Fast t_rr (50 ns)	Enables efficient operation up to ~100 kHz switching frequencies in flyback and forward converters
TO-220AC mechanical robustness	Supports 0.56 N·m mounting torque and passes JESD201 Class 2 whisker testing
AEC-Q101 qualified option	HERA805GH variant meets stress-test requirements for automotive power electronics

Applications

Industrial DC/DC Converters	Automotive Onboard Chargers
Use Scenario: Secondary-side rectification in isolated 400–600 W industrial DC/DC modules operating at 100 kHz. IC Role / Device Role / Timing Role: Power rectifier converting high-frequency transformer output to regulated DC bus. Use Value: 1.3 V V_F and 2 °C/W R_θJC enable >92% efficiency at full load without forced air cooling.	Use Scenario: Output rectification stage in bidirectional OBC designs with 400 V battery interface. IC Role / Device Role / Timing Role: Freewheeling diode handling regenerative energy during AC/DC and DC/AC modes. Use Value: 150 A I_FSM withstands transient surges during mode transitions; AEC-Q101 option supports functional safety compliance.
Switched-Mode Inverters	Freewheeling in Motor Drives
Use Scenario: Anti-parallel freewheeling path in 3-phase IGBT-based inverters for HVAC compressors. IC Role / Device Role / Timing Role: Provides low-loss return path during IGBT off-time in PWM cycles. Use Value: 50 ns t_rr limits reverse recovery charge (Q_rr) and reduces switching losses in 15–20 kHz operation.	Use Scenario: Snubberless freewheeling in 24–48 V BLDC motor controllers driving industrial pumps. IC Role / Device Role / Timing Role: Clamps inductive kickback from motor windings during PWM turn-off. Use Value: 400 V V_RRM safely handles back-EMF spikes up to 350 V; glass passivation prevents degradation in humid factory environments.

Industrial DC/DC Converters

Automotive Onboard Chargers

Use Scenario: Secondary-side rectification in isolated 400–600 W industrial DC/DC modules operating at 100 kHz.

IC Role / Device Role / Timing Role: Power rectifier converting high-frequency transformer output to regulated DC bus.

Use Value: 1.3 V V_F and 2 °C/W R_θJC enable >92% efficiency at full load without forced air cooling.

Use Scenario: Output rectification stage in bidirectional OBC designs with 400 V battery interface.

IC Role / Device Role / Timing Role: Freewheeling diode handling regenerative energy during AC/DC and DC/AC modes.

Use Value: 150 A I_FSM withstands transient surges during mode transitions; AEC-Q101 option supports functional safety compliance.

Switched-Mode Inverters

Freewheeling in Motor Drives

Use Scenario: Anti-parallel freewheeling path in 3-phase IGBT-based inverters for HVAC compressors.

IC Role / Device Role / Timing Role: Provides low-loss return path during IGBT off-time in PWM cycles.

Use Value: 50 ns t_rr limits reverse recovery charge (Q_rr) and reduces switching losses in 15–20 kHz operation.

Use Scenario: Snubberless freewheeling in 24–48 V BLDC motor controllers driving industrial pumps.

IC Role / Device Role / Timing Role: Clamps inductive kickback from motor windings during PWM turn-off.

Use Value: 400 V V_RRM safely handles back-EMF spikes up to 350 V; glass passivation prevents degradation in humid factory environments.

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	400 V V_RRM, 8 A I_F, 1.25 V V_F @ 8 A, 45 ns t_rr, TO-220AC	Slightly lower V_F and t_rr	Better efficiency at light loads; no AEC-Q101 variant available
ONsemi MUR840E	400 V V_RRM, 8 A I_F, 1.35 V V_F @ 8 A, 60 ns t_rr, TO-220AC	Higher V_F and slower recovery	Lower cost; suitable where thermal margin exists and EMI constraints are relaxed

Compared with STTH8R04DJF and MUR840E, the HERA805G offers balanced performance: lower V_F than MUR840E for reduced conduction loss, and AEC-Q101 qualification unavailable in STTH8R04DJF-making HERA805GH the only qualified option among the three for automotive use.

Availability

HERA805G is available at Aetrix Electronics and suitable for industrial DC/DC converters, automotive onboard chargers, and motor drive freewheeling applications requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for HERA805G 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, MOSFETs, and LED drivers.

The HERA series targets high-reliability power conversion systems, emphasizing ruggedized packaging, low-loss silicon design, and qualification-ready variants for automotive and industrial markets.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for HERA805G?

The HERA805G has a V_RRM rating of 400 V, verified per the manufacturer's absolute maximum ratings table. This value defines the highest reverse voltage the device can block repeatedly without breakdown under normal operating conditions. Exceeding 400 V risks irreversible junction failure. The HERA805G is part of the HERA801G–HERA808G family, where "805" explicitly denotes the 400 V grade.

Is HERA805G suitable for automotive applications?

Yes-HERA805G has an AEC-Q101-qualified variant: HERA805GH. While the standard HERA805G is not certified, the GH suffix indicates full qualification including temperature cycling, humidity bias HAST, and mechanical shock testing. For automotive designs requiring functional safety documentation, HERA805GH must be specified and sourced separately.

What is the forward voltage (V_F) of HERA805G at full rated current?

The HERA805G exhibits a typical forward voltage of 1.3 V at 8 A and 25°C junction temperature, as confirmed in the electrical specifications table. This value increases with temperature and current-e.g., ~1.45 V at 8 A and 125°C. Designers must account for this drift when calculating conduction losses and thermal rise in continuous operation.

Does HERA805G have a built-in thermal protection feature?

No-HERA805G is a passive silicon rectifier diode with no integrated thermal shutdown or sensing circuitry. Protection relies entirely on external thermal design: proper heatsinking (leveraging its 2 °C/W R_θJC), ambient temperature control, and current derating above 75°C case temperature per the forward current derating curve in the datasheet.

What is the reverse recovery time (t_rr) specification for HERA805G?

The HERA805G has a maximum reverse recovery time of 50 ns, measured under standardized conditions: I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A. This fast recovery enables clean commutation in high-frequency switch-mode topologies and reduces switching losses compared to standard recovery diodes.

HERA805G 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):: 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:: 65pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AC

Operating Temperature - Junction:: -55°C ~ 150°C

HERA805G FAQ

1.How can I place an order for HERA805G through Aetrix?

Please submit a Request for Quotation (RFQ) for HERA805G 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 HERA805G reliable?

The price and inventory of HERA805G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HERA805G is usually 5 days.

3.What payment methods are accepted for HERA805G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HERA805G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HERA805G?

HERA805G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HERA805G 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 HERA805G?

For technical support, including HERA805G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HERA805G requirements.

6.How does Aetrix verify that HERA805G is sourced from the original manufacturer or authorized distributors?

All HERA805G 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 HERA805G meets industry standards.

7.What is the process for return or replacement of HERA805G?

All HERA805G units undergo pre-shipment inspection (PSI). If there is an issue with HERA805G, 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 HERA805G part is unused and in its original packaging.

Return procedure for HERA805G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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