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

Taiwan Semiconductor Corporation HER304G

Name: HER304G
Brand: Taiwan Semiconductor Corporation
SKU: HER304G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HER304G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: HER304G.pdf

Description:: DIODE GEN PURP 300V 3A DO201AD

Quantity:: RFQ Add To RFQ list

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Inventory:2,186

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Product details

Overview

HER304G from Taiwan Semiconductor is a high-efficiency, ultra-fast recovery rectifier diode in DO-201AD package, rated for 3 A average forward current, 400 V repetitive peak reverse voltage (V_RRM), and 50 ns reverse recovery time (t_rr). It delivers low forward voltage drop (1.0 V at 3 A, 25°C) and supports freewheeling and DC–DC converter applications in automotive-grade power supplies.

For engineers reviewing the HER304G datasheet, HER304G pinout, HER304G application, or HER304G equivalent, key selection criteria include its 400 V V_RRM, 125 A surge rating, AEC-Q101 qualification option (HER304GH), DO-201AD mechanical compatibility, and verified 50 ns t_rr performance under standardized test conditions (I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A).

Technical Context

The HER304G employs a single-die silicon planar junction structure optimized for fast switching and low conduction loss. Its 50 ns reverse recovery time enables operation in high-frequency switching topologies up to several hundred kHz without excessive switching losses.

Thermally, it features 10 °C/W junction-to-lead (R_θJL) and 35 °C/W junction-to-ambient (R_θJA) resistance, supporting reliable 3 A continuous operation with appropriate PCB copper area or heatsinking. Polarity is marked by a cathode band on the DO-201AD case.

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	3 A - Continuous average forward current capability at T_A = 25°C with adequate thermal management
t_rr	50 ns - Measured reverse recovery time under standard conditions; enables efficient high-frequency switching
V_F	1.0 V @ 3 A, 25°C - Forward voltage drop determining conduction loss and thermal load in rectification path
I_FSM	125 A - Peak non-repetitive surge current tolerance for transient overload protection (8.3 ms half-sine)
Junction Temp	−55°C to +150°C - Operating temperature range defining reliability envelope for automotive and industrial use
C_J	60 pF @ 1 MHz, 4.0 V - Junction capacitance affecting high-frequency noise and EMI behavior in switching nodes

Pinout & Package

HER304G is housed in a DO-201AD axial-leaded plastic package with cathode-indicating band. Leads are pure tin-plated and solderable per J-STD-002. Weight ≈ 1.10 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unmarked end)	Forward current entry point	Connected to lower-potential side of rectifier bridge or freewheeling path
Cathode (banded end)	Forward current exit / reverse blocking terminal	Connected to output rail or switch node; polarity marking prevents incorrect installation

Key Features

Feature	Design Value
Ultra-fast recovery	50 ns t_rr minimizes switching loss and improves efficiency in SMPS operating above 100 kHz
Low forward voltage	1.0 V @ 3 A reduces conduction loss and thermal stress versus standard FR/UF diodes
AEC-Q101 option	HER304GH variant qualified for automotive powertrain and body electronics per stress test requirements
High surge robustness	125 A I_FSM withstands inrush and fault currents in DC–DC input stages and motor drives
Halogen-free & RoHS	Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally constrained designs

Applications

DC–DC Converters	Switching Inverters
Use Scenario: Secondary-side synchronous rectification in isolated flyback or forward converters delivering 12–48 V outputs. IC Role / Device Role / Timing Role: High-efficiency unidirectional current path enabling >90% conversion efficiency at 3 A load. Use Value: 1.0 V V_F and 50 ns t_rr reduce both conduction and switching losses compared to standard rectifiers.	Use Scenario: Output stage rectification in solar microinverters and UPS inverters operating at 20–100 kHz. IC Role / Device Role / Timing Role: Fast-recovery freewheeling diode across IGBT/MOSFET switches to clamp inductive kickback. Use Value: 125 A I_FSM and 400 V V_RRM support safe energy dissipation during rapid switch turn-off events.
Automotive Power Supplies	Industrial Freewheeling
Use Scenario: Input rectification in 12 V/24 V automotive DC–DC modules powering ADAS sensors and infotainment systems. IC Role / Device Role / Timing Role: AEC-Q101-qualified (HER304GH) rectifier ensuring long-term reliability under thermal cycling and vibration. Use Value: −55°C to +150°C operating range and JESD201 Class 2 whisker resistance enable deployment in engine bay environments.	Use Scenario: Inductive load snubbing in PLC output drivers, solenoid controllers, and relay interface circuits. IC Role / Device Role / Timing Role: Freewheeling path for stored magnetic energy in coils and transformers during de-energization. Use Value: Low V_F limits voltage overshoot and ensures rapid current decay, protecting driving transistors from breakdown.

DC–DC Converters

Switching Inverters

Use Scenario: Secondary-side synchronous rectification in isolated flyback or forward converters delivering 12–48 V outputs.

IC Role / Device Role / Timing Role: High-efficiency unidirectional current path enabling >90% conversion efficiency at 3 A load.

Use Value: 1.0 V V_F and 50 ns t_rr reduce both conduction and switching losses compared to standard rectifiers.

Use Scenario: Output stage rectification in solar microinverters and UPS inverters operating at 20–100 kHz.

IC Role / Device Role / Timing Role: Fast-recovery freewheeling diode across IGBT/MOSFET switches to clamp inductive kickback.

Use Value: 125 A I_FSM and 400 V V_RRM support safe energy dissipation during rapid switch turn-off events.

Automotive Power Supplies

Industrial Freewheeling

Use Scenario: Input rectification in 12 V/24 V automotive DC–DC modules powering ADAS sensors and infotainment systems.

IC Role / Device Role / Timing Role: AEC-Q101-qualified (HER304GH) rectifier ensuring long-term reliability under thermal cycling and vibration.

Use Value: −55°C to +150°C operating range and JESD201 Class 2 whisker resistance enable deployment in engine bay environments.

Use Scenario: Inductive load snubbing in PLC output drivers, solenoid controllers, and relay interface circuits.

IC Role / Device Role / Timing Role: Freewheeling path for stored magnetic energy in coils and transformers during de-energization.

Use Value: Low V_F limits voltage overshoot and ensures rapid current decay, protecting driving transistors from breakdown.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-efficiency rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L04S	Same DO-201AD package, 400 V V_RRM, but 60 ns t_rr and 1.15 V V_F @ 3 A	Slightly higher conduction loss; not AEC-Q101 qualified	Preferred where cost sensitivity outweighs marginal efficiency gain and automotive qualification is unnecessary
ON Semi MUR3040	DO-201AD, 400 V V_RRM, 60 ns t_rr, 1.25 V V_F @ 3 A, no AEC-Q101 option	Higher V_F increases thermal load; lacks automotive qualification path	Valid alternative for industrial-only designs where supply chain diversification is prioritized

Compared with STTH3L04S and MUR3040, HER304G offers the lowest V_F (1.0 V) and fastest t_rr (50 ns) in its voltage class, with an AEC-Q101-qualified variant available-making it optimal for thermally constrained or automotive-critical rectification paths.

Availability

HER304G is available at Aetrix Electronics and suitable for DC–DC converters, switching inverters, and automotive power supplies requiring stable component supply, long-lifecycle availability, and traceable sourcing.

Supply support for HER304G 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 devices, and MOSFETs.

The HER301G–HER308G family was designed specifically for high-efficiency, high-reliability AC/DC and DC/DC power conversion in automotive, industrial, and computing applications demanding fast recovery and low conduction loss.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for HER304G?

The HER304G has a V_RRM rating of 400 V, as confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version I2105). This value is fixed for the HER304G variant and distinguishes it from adjacent members of the HER301G–HER308G series (e.g., HER303G = 200 V, HER305G = 600 V). Exceeding 400 V risks irreversible avalanche breakdown.

Is HER304G AEC-Q101 qualified?

The base HER304G is not AEC-Q101 qualified; however, the HER304GH variant-identical in electrical and thermal specs-is explicitly qualified per AEC-Q101. The "H" suffix denotes qualification, and both parts share the same DO-201AD package and marking code "HER304G", with qualification status indicated only in ordering code and packaging labels.

What is the reverse recovery time (t_rr) of HER304G and how is it measured?

The HER304G has a typical t_rr of 50 ns, measured under standardized conditions: I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A, per the Electrical Specifications table. This value applies specifically to HER301G–HER305G variants and is validated using the test circuit shown in Figure 6 of the datasheet. It reflects actual switching speed-not a calculated or extrapolated figure.

Does HER304G have a halogen-free and RoHS-compliant construction?

Yes, HER304G meets both RoHS Directive 2011/65/EU and IEC 61249-2-21 halogen-free requirements. The molding compound is UL 94V-0 rated, leads are pure tin-plated, and the full compliance statement appears in the FEATURES section of the Taiwan Semiconductor datasheet (Version I2105).

What is the thermal resistance from junction to ambient (R_θJA) for HER304G in DO-201AD package?

The HER304G has a typical R_θJA of 35 °C/W when mounted on a standard JEDEC 2S2P test board, as specified in the Thermal Performance table. This value assumes natural convection and defines the worst-case thermal gradient between junction and ambient air-critical for derating I_F at elevated ambient temperatures.

HER304G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 300 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 1 V @ 3 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 50 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 300 V

Capacitance @ Vr, F:: 60pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

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

HER304G FAQ

1.How can I place an order for HER304G through Aetrix?

Please submit a Request for Quotation (RFQ) for HER304G 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 HER304G reliable?

The price and inventory of HER304G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER304G is usually 5 days.

3.What payment methods are accepted for HER304G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER304G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HER304G?

HER304G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HER304G 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 HER304G?

For technical support, including HER304G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER304G requirements.

6.How does Aetrix verify that HER304G is sourced from the original manufacturer or authorized distributors?

All HER304G 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 HER304G meets industry standards.

7.What is the process for return or replacement of HER304G?

All HER304G units undergo pre-shipment inspection (PSI). If there is an issue with HER304G, 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 HER304G part is unused and in its original packaging.

Return procedure for HER304G:

1.Submit a request within 90 days.

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

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