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

Taiwan Semiconductor Corporation HER202G-T

Name: HER202G-T
Brand: Taiwan Semiconductor Corporation
SKU: HER202G-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HER202G-T

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: HER202G-T.pdf

Description:: 50NS, 2A, 100V, HIGH EFFICIENT R

Quantity:: RFQ Add To RFQ list

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Inventory:3,423

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Product details

Overview

HER202G-T from Taiwan Semiconductor is a 2A, 100V fast recovery rectifier diode in DO-204AC (DO-15) package, featuring 1.0V forward voltage at 2A/25°C, 50ns reverse recovery time, and 60A surge capability - deployed in DC-DC converters and switching-mode inverters.

For engineers reviewing the HER202G-T datasheet, HER202G-T pinout, HER202G-T application, or HER202G-T equivalent, key selection criteria include V_RRM = 100V, I_F = 2A, t_rr = 50ns, thermal resistance R_θJA = 60°C/W, and DO-15 mechanical compatibility with standard through-hole power layouts.

Technical Context

This single-die, glass-passivated fast recovery rectifier uses a planar junction structure optimized for low conduction loss and rapid carrier recombination. Its 50ns t_rr enables operation in high-frequency switching topologies up to ~100kHz without excessive switching loss.

Rated for continuous operation from –55°C to +150°C junction temperature, it delivers stable performance under transient surge conditions (60A, 8.3ms half-sine) and maintains <5µA leakage at 100V/25°C - critical for efficiency-sensitive offline and isolated DC-DC stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	100 V - Maximum repetitive reverse voltage before breakdown; sets safe operating margin in 75–90V nominal bus designs.
I_F	2 A - Continuous average forward current; defines steady-state power handling in TO-220-replacement space-constrained layouts.
t_rr	50 ns - Reverse recovery time; enables efficient operation in 50–100 kHz SMPS without significant tail-current loss.
V_F	1.0 V @ 2A, 25°C - Forward voltage drop; contributes ~2W conduction loss at full load, requiring thermal derating above 75°C ambient.
R_θJA	60 °C/W - Junction-to-ambient thermal resistance; implies ~120°C rise at 2A in still air, necessitating PCB copper pour or forced airflow.
I_FSM	60 A - Non-repetitive surge current rating; supports cold-start inrush and short-circuit fault tolerance in unregulated supplies.

Pinout & Package

Package: DO-204AC (DO-15), axial-leaded, glass-passivated, RoHS-compliant, halogen-free molding compound (UL 94V-0), cathode indicated by band.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Forward current entry	Connected to lower-potential side (e.g., transformer secondary center-tap or switch node return path).
Cathode (Lead 2, banded end)	Forward current exit / reverse blocking terminal	Connected to output rail or capacitor positive; blocks reverse voltage up to 100V during off-cycle.

Key Features

Feature	Design Value
Fast recovery (t_rr = 50 ns)	Reduces switching losses in high-frequency converters, improving efficiency over standard rectifiers (>500 ns).
Low V_F (1.0 V @ 2A)	Lowers conduction loss by ~15% vs. comparable 100V Schottky alternatives rated >1.15V at same current.
High I_FSM (60 A)	Withstands 8.3ms inrush surges common in AC-input rectification and motor drive freewheeling paths.
DO-204AC mechanical standardization	Enables direct replacement of legacy 1N400x, 1N540x, and similar axial diodes without board redesign.

Applications

DC-DC Converter Output Rectification	Switching Mode Inverter Freewheeling
Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24V at ≤2A. IC Role / Device Role / Timing Role: Unidirectional current valve converting high-frequency AC from transformer to regulated DC output. Use Value: 50ns t_rr minimizes reverse recovery charge loss, preserving >92% efficiency at 65kHz switching frequency.	Use Scenario: Freewheeling path across inductive loads (e.g., BLDC motor phases or relay coils) in half-bridge inverters. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during high-side switch off-time. Use Value: 1.0V V_F limits freewheeling dissipation to <2W, reducing heatsink requirements in compact motor drives.
Offline AC-DC Adapter Input Bridge	Industrial Power Supply Snubber Clamp
Use Scenario: One leg of a 4-diode bridge rectifier in universal-input (85–265V AC) 15–30W adapters. IC Role / Device Role / Timing Role: Conducts during positive half-cycle; blocks reverse voltage up to 100V peak (141V AC × √2 ≈ 200V, derated). Use Value: 100V V_RRM provides 2× safety margin over 141V peak input, meeting IEC 61000-4-5 surge immunity requirements.	Use Scenario: Clamp diode in RCD snubber networks across MOSFETs in industrial SMPS main switches. IC Role / Device Role / Timing Role: Rapidly conducts stored inductive energy during switch turn-off to limit voltage overshoot. Use Value: 50ns t_rr ensures clamping action initiates before drain voltage peaks, suppressing spikes below 120% of V_DS.

DC-DC Converter Output Rectification

Switching Mode Inverter Freewheeling

Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–24V at ≤2A.

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

Use Value: 50ns t_rr minimizes reverse recovery charge loss, preserving >92% efficiency at 65kHz switching frequency.

Use Scenario: Freewheeling path across inductive loads (e.g., BLDC motor phases or relay coils) in half-bridge inverters.

IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during high-side switch off-time.

Use Value: 1.0V V_F limits freewheeling dissipation to <2W, reducing heatsink requirements in compact motor drives.

Offline AC-DC Adapter Input Bridge

Industrial Power Supply Snubber Clamp

Use Scenario: One leg of a 4-diode bridge rectifier in universal-input (85–265V AC) 15–30W adapters.

IC Role / Device Role / Timing Role: Conducts during positive half-cycle; blocks reverse voltage up to 100V peak (141V AC × √2 ≈ 200V, derated).

Use Value: 100V V_RRM provides 2× safety margin over 141V peak input, meeting IEC 61000-4-5 surge immunity requirements.

Use Scenario: Clamp diode in RCD snubber networks across MOSFETs in industrial SMPS main switches.

IC Role / Device Role / Timing Role: Rapidly conducts stored inductive energy during switch turn-off to limit voltage overshoot.

Use Value: 50ns t_rr ensures clamping action initiates before drain voltage peaks, suppressing spikes below 120% of V_DS.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH2R01	V_RRM = 100V, t_rr = 45ns, V_F = 1.05V @ 2A - slightly faster but higher VF	Better suited for >100kHz designs where recovery speed dominates conduction loss	Select STTH2R01 when optimizing for minimal switching loss in high-frequency PFC or resonant converters.
ES2D	V_RRM = 200V, t_rr = 35ns, V_F = 0.95V @ 2A - higher voltage rating, lower VF, faster recovery	Supports 160V AC input systems and offers improved efficiency in 50–75°C ambient environments	Choose ES2D when upgrading for higher input voltage margin or tighter thermal constraints in enclosed enclosures.

Compared with STTH2R01 and ES2D, the HER202G-T offers optimal balance of cost, proven reliability in DO-15 footprint, and sufficient speed for 50–80kHz industrial SMPS - making it preferred for cost-sensitive, volume production of AC-DC adapters and auxiliary power supplies.

Availability

HER202G-T is available at Aetrix Electronics and suitable for DC-DC converters, switching-mode inverters, and freewheeling applications requiring stable component supply, long-term manufacturability, and RoHS/halogen-free compliance.

Supply support for HER202G-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, serving global power, automotive, and industrial markets since 1979.

The HER20xG-T series is part of TSC's high-reliability fast recovery rectifier product line, engineered specifically for efficiency-critical, thermally constrained switching power supplies in consumer, industrial, and lighting applications.

FAQ

What is the maximum junction temperature rating for HER202G-T?

The HER202G-T has a maximum junction temperature (T_J) of +150°C and a minimum of –55°C. This wide operating range allows reliable deployment in industrial environments with elevated ambient temperatures. Derating curves in the official datasheet specify that continuous forward current must be reduced linearly above 75°C ambient to maintain T_J ≤ 150°C. The HER202G-T achieves this via its 60°C/W R_θJA and glass-passivated junction stability.

Is HER202G-T compatible with lead-free soldering processes?

Yes, the HER202G-T features pure tin-plated leads compliant with J-STD-002 for solderability and qualified for lead-free reflow profiles (peak temperature ≤ 260°C, 10-second dwell). Its DO-204AC package withstands standard IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), eliminating pre-bake requirements. The device also passes JESD 201 Class 1A whisker testing, ensuring long-term interconnect reliability in automated assembly.

How does HER202G-T compare to HER201G-T in terms of reverse voltage rating?

The HER202G-T is rated for 100V repetitive peak reverse voltage (V_RRM), whereas the HER201G-T is rated for 50V. Both share identical forward current (2A), surge rating (60A), and thermal specs, but the HER202G-T provides double the reverse blocking margin - making it suitable for 75–90V nominal DC buses and universal AC inputs where peak voltages exceed 70V. This difference is reflected in their respective marking codes (HER202G vs. HER201G).

What is the reverse leakage current specification for HER202G-T at elevated temperature?

At 100V reverse bias and 125°C junction temperature, the HER202G-T exhibits a maximum reverse leakage current (I_R) of 150 µA - per the datasheet's electrical specifications table. At 25°C and same voltage, leakage is limited to 5 µA. This controlled leakage ensures minimal standby power loss in always-on auxiliary supplies and supports stable regulation in high-impedance feedback networks where diode leakage could affect reference accuracy.

Can HER202G-T be used as a direct replacement for 1N4002 in existing designs?

Yes, the HER202G-T is mechanically and electrically compatible with the 1N4002 - both use DO-204AC (DO-15) package, share anode/cathode polarity marking, and have identical lead spacing. However, the HER202G-T offers superior performance: 50ns t_rr vs. >2 µs for 1N4002, 1.0V V_F vs. ~1.1V, and 60A I_FSM vs. 50A. This enables immediate efficiency and thermal improvement in legacy 1N4002-based designs without layout changes - provided the 100V V_RRM meets system voltage requirements.

HER202G-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):: 100 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 @ 100 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

HER202G-T FAQ

1.How can I place an order for HER202G-T through Aetrix?

Please submit a Request for Quotation (RFQ) for HER202G-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 HER202G-T reliable?

The price and inventory of HER202G-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER202G-T is usually 5 days.

3.What payment methods are accepted for HER202G-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER202G-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HER202G-T?

HER202G-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HER202G-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 HER202G-T?

For technical support, including HER202G-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER202G-T requirements.

6.How does Aetrix verify that HER202G-T is sourced from the original manufacturer or authorized distributors?

All HER202G-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 HER202G-T meets industry standards.

7.What is the process for return or replacement of HER202G-T?

All HER202G-T units undergo pre-shipment inspection (PSI). If there is an issue with HER202G-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 HER202G-T part is unused and in its original packaging.

Return procedure for HER202G-T:

1.Submit a request within 90 days.

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

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