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

Taiwan Semiconductor Corporation HER103G-K

Name: HER103G-K
Brand: Taiwan Semiconductor Corporation
SKU: HER103G-K
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HER103G-K

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: HER103G-K.pdf

Description:: 50NS, 1A, 200V, HIGH EFFICIENT R

Quantity:: RFQ Add To RFQ list

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Product details

Overview

HER103G-K from Taiwan Semiconductor is a high-efficiency, glass-passivated silicon rectifier diode rated for 1 A average forward current and 200 V repetitive peak reverse voltage (V_RRM), with low 1.0 V forward voltage at 1 A and 50 ns reverse recovery time - used in DC-DC converters and freewheeling paths in switching power supplies.

For engineers reviewing the HER103G-K datasheet, HER103G-K pinout, HER103G-K application, or HER103G-K equivalent, key selection criteria include V_RRM = 200 V, I_F = 1 A, V_F = 1.0 V @ 1 A, t_rr = 50 ns, and DO-41 package compatibility with through-hole PCB assembly and thermal derating up to 150 °C junction temperature.

Technical Context

This device is a single-die, standard recovery rectifier optimized for high-frequency switching applications where low conduction loss and fast turn-off are required. Its 50 ns reverse recovery time and 15 °C/W junction-to-case thermal resistance support efficient operation in compact, thermally constrained layouts.

The DO-204AL (DO-41) package features pure tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 1A whisker resistance, with polarity indicated by cathode band and UL 94V-0 molding compound.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	200 V - Maximum non-repetitive reverse voltage the diode blocks without breakdown; defines usable input voltage range in flyback or buck-derived topologies.
I_F	1 A - Continuous average forward current rating at 75 °C ambient; determines maximum sustained output current capability in rectification stages.
V_F	1.0 V @ 1 A, 25 °C - Forward voltage drop at rated current; directly impacts conduction loss (P_cond ≈ 1.0 W) and thermal design margin.
t_rr	50 ns - Reverse recovery time under IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A; limits minimum switching frequency and reduces switching loss in SMPS.
R_θJA	60 °C/W - Junction-to-ambient thermal resistance; used to calculate junction temperature rise (ΔT_J = P_diss × 60) for board-level thermal validation.
I_FSM	30 A - Non-repetitive surge current (8.3 ms half-sine); supports inrush current handling during startup or fault transients without failure.

Pinout & Package

Package: DO-204AL (DO-41), axial leaded, glass-passivated, cathode indicated by band. Weight: 0.330 g. RoHS and halogen-free compliant.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side of rectifier path (e.g., transformer secondary center-tap or switch node in synchronous topology).
Cathode	Forward current exit / reverse blocking terminal	Marked with band; connects to output capacitor positive rail or load return; must withstand full V_RRM when reverse-biased.

Key Features

Feature	Design Value
Glass passivated junction	Enhances moisture resistance and long-term reliability under humid or thermally cycling conditions, critical for industrial power supplies.
Low V_F = 1.0 V @ 1 A	Reduces conduction losses by ~20% vs. legacy 1N400x series (V_F ≈ 1.1 V), improving efficiency in 5–24 V output converters.
t_rr = 50 ns	Enables stable operation up to ~100 kHz switching frequencies without excessive switching loss or EMI from slow turn-off.
DO-41 mechanical robustness	Supports automated axial insertion and wave soldering; meets JESD 201 Class 1A whisker resistance for high-reliability long-life deployments.

Applications

DC-DC Converter Input Rectification	Switching Mode Inverter Freewheeling
Use Scenario: AC/DC front-end or isolated DC-DC stage converting 12–48 V input to regulated 3.3–12 V output using flyback or forward topology. IC Role / Device Role / Timing Role: Primary-side unidirectional current path; conducts during MOSFET off-time and blocks reverse voltage during on-time. Use Value: 200 V V_RRM safely handles reflected voltage spikes; 1.0 V V_F minimizes heat generation in space-constrained enclosures.	Use Scenario: Bidirectional energy recovery path across inductive loads (e.g., motor windings or relay coils) in H-bridge inverters. IC Role / Device Role / Timing Role: Freewheeling diode clamping inductive kickback; conducts only during transient voltage reversal after switch turn-off. Use Value: 50 ns t_rr ensures rapid turn-off before next switching cycle, preventing cross-conduction and reducing voltage overshoot.
AC Adapter Output Stage	Industrial Power Supply Snubber Network
Use Scenario: Low-cost, high-volume wall adapters delivering ≤10 W at 5–12 V with minimal BOM count. IC Role / Device Role / Timing Role: Secondary-side output rectifier; converts transformer AC to pulsating DC prior to filtering. Use Value: DO-41 package enables manual or auto-insertion; 1 A rating supports typical adapter loads while maintaining <1.5 W dissipation at full load.	Use Scenario: RC snubber network across MOSFETs or IGBTs in 24–48 V industrial drives to suppress voltage transients. IC Role / Device Role / Timing Role: Transient voltage clamp; conducts only during nanosecond-scale overvoltage events, not steady-state. Use Value: 30 A I_FSM withstands repeated surge events; 150 °C T_JMAX allows operation near heatsink surfaces without derating.

DC-DC Converter Input Rectification

Switching Mode Inverter Freewheeling

Use Scenario: AC/DC front-end or isolated DC-DC stage converting 12–48 V input to regulated 3.3–12 V output using flyback or forward topology.

IC Role / Device Role / Timing Role: Primary-side unidirectional current path; conducts during MOSFET off-time and blocks reverse voltage during on-time.

Use Value: 200 V V_RRM safely handles reflected voltage spikes; 1.0 V V_F minimizes heat generation in space-constrained enclosures.

Use Scenario: Bidirectional energy recovery path across inductive loads (e.g., motor windings or relay coils) in H-bridge inverters.

IC Role / Device Role / Timing Role: Freewheeling diode clamping inductive kickback; conducts only during transient voltage reversal after switch turn-off.

Use Value: 50 ns t_rr ensures rapid turn-off before next switching cycle, preventing cross-conduction and reducing voltage overshoot.

AC Adapter Output Stage

Industrial Power Supply Snubber Network

Use Scenario: Low-cost, high-volume wall adapters delivering ≤10 W at 5–12 V with minimal BOM count.

IC Role / Device Role / Timing Role: Secondary-side output rectifier; converts transformer AC to pulsating DC prior to filtering.

Use Value: DO-41 package enables manual or auto-insertion; 1 A rating supports typical adapter loads while maintaining <1.5 W dissipation at full load.

Use Scenario: RC snubber network across MOSFETs or IGBTs in 24–48 V industrial drives to suppress voltage transients.

IC Role / Device Role / Timing Role: Transient voltage clamp; conducts only during nanosecond-scale overvoltage events, not steady-state.

Use Value: 30 A I_FSM withstands repeated surge events; 150 °C T_JMAX allows operation near heatsink surfaces without derating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R02	V_RRM = 200 V, I_F = 1 A, V_F = 1.15 V @ 1 A, t_rr = 35 ns, DO-41	Lower V_F in HER103G-K improves conduction efficiency; STTH1R02 offers faster t_rr but higher forward loss.	Prefer HER103G-K for thermally limited designs; STTH1R02 where switching speed dominates loss budget.
1N4934	V_RRM = 200 V, I_F = 1 A, V_F = 1.2 V @ 1 A, t_rr = 200 ns, DO-41	HER103G-K provides 4× faster recovery and 0.2 V lower V_F, enabling higher-frequency operation and cooler running.	Select HER103G-K over 1N4934 when upgrading legacy designs for efficiency or EMI reduction.

Compared with STTH1R02 and 1N4934, HER103G-K delivers optimal balance of low conduction loss (1.0 V V_F) and fast recovery (50 ns), making it preferred for cost-sensitive, thermally constrained 200 V rectification where both efficiency and switching performance matter.

Availability

HER103G-K is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and freewheeling applications requiring stable component supply, consistent DO-41 form factor, and RoHS-compliant manufacturing.

Supply support for HER103G-K 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 for industrial and consumer markets.

The HER10xG-K series was designed specifically for high-efficiency, medium-voltage rectification in compact switching power supplies - emphasizing low V_F, fast t_rr, and robust thermal performance in standard DO-41 packaging.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for HER103G-K?

The HER103G-K has a V_RRM rating of 200 V, meaning it reliably blocks up to 200 V of reverse voltage in repetitive operation. This value is confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version B2104) and defines the upper limit for safe reverse-bias operation in circuits like flyback transformers or inverter legs. Exceeding this voltage risks avalanche breakdown and permanent damage to the HER103G-K.

What is the forward voltage (V_F) of HER103G-K at 1 A and 25 °C?

The forward voltage of HER103G-K is 1.0 V at 1 A forward current and 25 °C junction temperature, as specified in the Electrical Specifications table. This measured value reflects conduction loss under nominal operating conditions and is critical for calculating power dissipation (P = I × V_F). The HER103G-K achieves this low V_F via optimized silicon processing and glass passivation, distinguishing it from general-purpose rectifiers like the 1N4004.

Is HER103G-K compatible with lead-free reflow or wave soldering processes?

Yes, HER103G-K features pure tin-plated leads that meet J-STD-002 solderability requirements and are fully compatible with lead-free wave soldering and hand-soldering. Its DO-41 package uses UL 94V-0 compliant molding compound and passes JESD 201 Class 1A whisker testing, ensuring reliable intermetallic formation and long-term joint integrity in RoHS-compliant manufacturing lines deploying the HER103G-K.

What is the reverse recovery time (t_rr) of HER103G-K, and under what test conditions?

The reverse recovery time of HER103G-K is 50 ns, measured under the standardized condition of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A, per the Electrical Specifications table. This parameter quantifies how quickly the diode transitions from conduction to blocking state, directly impacting switching loss and EMI in high-frequency converters. The HER103G-K's 50 ns t_rr enables stable operation beyond 50 kHz without significant efficiency penalty.

Does HER103G-K have a specified junction-to-ambient thermal resistance (R_θJA)?

Yes, HER103G-K has a typical R_θJA of 60 °C/W, as published in the Thermal Performance section of the datasheet. This value assumes standard JEDEC test conditions (single device on FR-4 board, 1-inch² copper pad). It is used to estimate junction temperature rise (ΔT_J = P_diss × 60) and verify thermal compliance in real-world layouts. For improved cooling, the HER103G-K's R_θJC = 15 °C/W allows heatsink attachment via case contact if mechanically feasible.

HER103G-K Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-204AL, DO-41, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 200 V

Current - Average Rectified (Io):: 1A

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

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

Reverse Recovery Time (trr):: 50 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 200 V

Capacitance @ Vr, F:: 15pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AL (DO-41)

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

HER103G-K FAQ

1.How can I place an order for HER103G-K through Aetrix?

Please submit a Request for Quotation (RFQ) for HER103G-K 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 HER103G-K reliable?

The price and inventory of HER103G-K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER103G-K is usually 5 days.

3.What payment methods are accepted for HER103G-K?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER103G-K transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HER103G-K?

HER103G-K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HER103G-K 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 HER103G-K?

For technical support, including HER103G-K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER103G-K requirements.

6.How does Aetrix verify that HER103G-K is sourced from the original manufacturer or authorized distributors?

All HER103G-K 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 HER103G-K meets industry standards.

7.What is the process for return or replacement of HER103G-K?

All HER103G-K units undergo pre-shipment inspection (PSI). If there is an issue with HER103G-K, 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 HER103G-K part is unused and in its original packaging.

Return procedure for HER103G-K:

1.Submit a request within 90 days.

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

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