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

Taiwan Semiconductor Corporation HER204G-T

Name: HER204G-T
Brand: Taiwan Semiconductor Corporation
SKU: HER204G-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HER204G-T

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-204AC, DO-15, Axial

Datasheet:: HER204G-T.pdf

Description:: 50NS, 2A, 300V, HIGH EFFICIENT R

Quantity:: RFQ Add To RFQ list

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Inventory:8,863

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Product details

Overview

HER204G-T from Taiwan Semiconductor is a 2 A, 300 V fast recovery rectifier diode in DO-204AC (DO-15) package, featuring 50 ns reverse recovery time, 1.0 V forward voltage at 2 A/25°C, and 60 A surge current capability; used in switching-mode power supplies for freewheeling and output rectification.

For engineers reviewing the HER204G-T datasheet, HER204G-T pinout, HER204G-T application, or HER204G-T equivalent, key selection criteria include V_RRM = 300 V, t_rr = 50 ns, I_F = 2 A continuous, thermal resistance R_θJA = 60 °C/W, and DO-204AC mechanical compatibility.

Technical Context

This single-die, glass-passivated fast recovery rectifier operates with low conduction loss (V_F = 1.0 V @ 2 A, 25°C) and rapid switching (t_rr = 50 ns), enabling high-efficiency operation in high-frequency DC–DC converters and SMPS topologies. Its 300 V repetitive peak reverse voltage and 60 A non-repetitive surge rating support robust transient handling in industrial and consumer power stages.

The device uses pure tin-plated leads compliant with J-STD-002, meets JESD 201 Class 1A whisker resistance, and is housed in UL 94V-0 rated molding compound - confirming suitability for automated assembly and long-term reliability in thermally demanding environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	300 V - maximum repetitive reverse blocking voltage; defines safe operating limit in flyback/freewheeling paths
I_F	2 A - continuous forward current rating at 25°C ambient; derates linearly above 25°C per curve Fig.1
t_rr	50 ns - reverse recovery time under IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A; enables >100 kHz switching
V_F	1.0 V @ 2 A, 25°C - forward voltage drop; determines conduction loss and thermal load in rectifier stage
I_FSM	60 A - peak non-repetitive surge current (8.3 ms half-sine); supports inrush and fault-current tolerance
R_θJA	60 °C/W - junction-to-ambient thermal resistance; sets heatsink/no-heatsink boundary for 2 A operation

Pinout & Package

Package: DO-204AC (DO-15), axial leaded, glass-passivated, cathode indicated by band. Weight ≈ 0.400 g. RoHS and halogen-free compliant.

Pin/Terminal	Circuit Role	Design Meaning
Anode (lead without band)	Forward current entry point	Connected to lower-potential side of rectifier path (e.g., transformer secondary center-tap or switch node)
Cathode (lead with band)	Forward current exit / reverse blocking terminal	Connected to output rail or filter capacitor; blocks reverse voltage up to 300 V

Key Features

Feature	Design Value
Glass passivated junction	Enhances moisture resistance and long-term reliability vs. epoxy-passivated alternatives
Low V_F = 1.0 V @ 2 A	Reduces conduction loss by ~15–20% versus standard recovery diodes at same current
t_rr = 50 ns	Minimizes switching loss and EMI in 100–500 kHz SMPS designs
J-STD-002 solderable leads	Ensures consistent wetting and joint integrity in reflow and wave solder processes

Applications

DC–DC Converter Output Rectification	Switch-Mode Power Supply Freewheeling
Use Scenario: Secondary-side rectification in isolated buck-derived topologies (e.g., forward, flyback) delivering 5–24 V at ≤2 A. IC Role / Device Role / Timing Role: Unidirectional current valve converting high-frequency AC from transformer into regulated DC output. Use Value: Low V_F and fast t_rr reduce average power loss and improve efficiency by ≥1.2% over standard recovery diodes at 200 kHz.	Use Scenario: Freewheeling path across inductive loads (e.g., PFC chokes, motor windings) in discontinuous conduction mode. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during switch-off phase to clamp inductive kickback. Use Value: 60 A I_FSM withstands high di/dt transients; 50 ns t_rr prevents reverse recovery snap-off and associated voltage overshoot.
AC–DC Adapter Secondary Rectifier	Industrial SMPS Input Bridge Snubber
Use Scenario: Output rectification in compact wall adapters (≤36 W) with universal input and regulated 5/12/19 V outputs. IC Role / Device Role / Timing Role: Final-stage power conversion element delivering clean DC to USB ports or logic rails. Use Value: DO-204AC package fits tight board spacing; 300 V V_RRM provides margin against reflected transients in unregulated designs.	Use Scenario: Snubber diode in RCD clamp networks across primary-side MOSFETs in 65–150 W industrial SMPS. IC Role / Device Role / Timing Role: Fast turn-on/turn-off element absorbing leakage energy during MOSFET switching transitions. Use Value: 50 ns t_rr ensures minimal delay between MOSFET turn-off and snubber activation, reducing peak drain voltage stress.

DC–DC Converter Output Rectification

Switch-Mode Power Supply Freewheeling

Use Scenario: Secondary-side rectification in isolated buck-derived topologies (e.g., forward, flyback) delivering 5–24 V at ≤2 A.

IC Role / Device Role / Timing Role: Unidirectional current valve converting high-frequency AC from transformer into regulated DC output.

Use Value: Low V_F and fast t_rr reduce average power loss and improve efficiency by ≥1.2% over standard recovery diodes at 200 kHz.

Use Scenario: Freewheeling path across inductive loads (e.g., PFC chokes, motor windings) in discontinuous conduction mode.

IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during switch-off phase to clamp inductive kickback.

Use Value: 60 A I_FSM withstands high di/dt transients; 50 ns t_rr prevents reverse recovery snap-off and associated voltage overshoot.

AC–DC Adapter Secondary Rectifier

Industrial SMPS Input Bridge Snubber

Use Scenario: Output rectification in compact wall adapters (≤36 W) with universal input and regulated 5/12/19 V outputs.

IC Role / Device Role / Timing Role: Final-stage power conversion element delivering clean DC to USB ports or logic rails.

Use Value: DO-204AC package fits tight board spacing; 300 V V_RRM provides margin against reflected transients in unregulated designs.

Use Scenario: Snubber diode in RCD clamp networks across primary-side MOSFETs in 65–150 W industrial SMPS.

IC Role / Device Role / Timing Role: Fast turn-on/turn-off element absorbing leakage energy during MOSFET switching transitions.

Use Value: 50 ns t_rr ensures minimal delay between MOSFET turn-off and snubber activation, reducing peak drain voltage stress.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fast recovery rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH2R06U	V_RRM = 600 V, t_rr = 35 ns, V_F = 1.15 V @ 2 A - higher voltage rating, faster recovery, slightly higher VF	Better suited for 400 V bus systems or ultra-high-frequency (>300 kHz) designs where lower t_rr dominates loss budget	Select when V_RRM margin >400 V is required or t_rr <40 ns is critical; not drop-in due to different package (DO-204AL)
ES2D	V_RRM = 200 V, t_rr = 35 ns, V_F = 0.95 V @ 2 A - lower voltage, faster, lower VF, SMD SMB package	Designed for surface-mount layouts with tighter space constraints and lower voltage rails (≤150 V)	Choose for automated SMT assembly and space-constrained boards; insufficient V_RRM for 300 V applications

Compared with STTH2R06U and ES2D, the HER204G-T offers optimal balance of 300 V rating, 50 ns recovery, and through-hole DO-204AC robustness for cost-sensitive, medium-frequency industrial and adapter power supplies - without requiring PCB redesign or thermal derating penalties.

Availability

HER204G-T is available at Aetrix Electronics and suitable for DC–DC converters, switching-mode power supplies, and freewheeling applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for HER204G-T 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 HER20xG-T series targets cost-effective, high-reliability AC/DC and DC/DC power conversion, emphasizing fast recovery, thermal robustness, and JEDEC-compliant packaging for global industrial and consumer power supply design.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for HER204G-T?

The HER204G-T has a V_RRM of 300 V, as confirmed in the Absolute Maximum Ratings table on page 1 of the Taiwan Semiconductor datasheet (Version B2105). This value is fixed per part number within the HER201G-T to HER206G-T family and defines the highest reverse voltage the device can block repeatedly without breakdown.

What is the forward voltage drop of HER204G-T at rated current?

The HER204G-T exhibits a typical forward voltage (V_F) of 1.0 V at I_F = 2 A and T_J = 25°C, per the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) and represents conduction loss under nominal operating conditions.

Is HER204G-T compatible with lead-free reflow soldering?

Yes, the HER204G-T features pure tin-plated leads qualified per J-STD-002 for solderability, and its DO-204AC package is rated for lead-free reflow profiles. The molding compound meets UL 94V-0 and halogen-free standards (IEC 61249-2-21), supporting RoHS-compliant manufacturing.

What is the reverse recovery time (t_rr) specification for HER204G-T?

The HER204G-T has a maximum reverse recovery time (t_rr) of 50 ns, tested under I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A conditions. This parameter is explicitly listed for HER204G-T in the Electrical Specifications table and confirms its classification as a fast recovery rectifier.

Does HER204G-T have a specified junction-to-ambient thermal resistance?

Yes, the HER204G-T has a typical junction-to-ambient thermal resistance (R_θJA) of 60 °C/W, as published in the Thermal Performance section. This value applies to the device mounted on a standard FR-4 PCB with no added heatsinking and is used to calculate junction temperature rise under given power dissipation.

HER204G-T Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-204AC, DO-15, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

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

Current - Average Rectified (Io):: 2A

Voltage - Forward (Vf) (Max) @ If:: 1 V @ 2 A

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

Reverse Recovery Time (trr):: 50 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 300 V

Capacitance @ Vr, F:: 35pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AC (DO-15)

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

HER204G-T FAQ

1.How can I place an order for HER204G-T through Aetrix?

Please submit a Request for Quotation (RFQ) for HER204G-T 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 HER204G-T reliable?

The price and inventory of HER204G-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER204G-T is usually 5 days.

3.What payment methods are accepted for HER204G-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER204G-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HER204G-T?

HER204G-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HER204G-T 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 HER204G-T?

For technical support, including HER204G-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER204G-T requirements.

6.How does Aetrix verify that HER204G-T is sourced from the original manufacturer or authorized distributors?

All HER204G-T 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 HER204G-T meets industry standards.

7.What is the process for return or replacement of HER204G-T?

All HER204G-T units undergo pre-shipment inspection (PSI). If there is an issue with HER204G-T, 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 HER204G-T part is unused and in its original packaging.

Return procedure for HER204G-T:

1.Submit a request within 90 days.

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

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