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

Taiwan Semiconductor Corporation HER105G

Name: HER105G
Brand: Taiwan Semiconductor Corporation
SKU: HER105G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HER105G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: HER105G.pdf

Description:: DIODE GEN PURP 400V 1A DO204AL

Quantity:: RFQ Add To RFQ list

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Product details

Overview

HER105G from Taiwan Semiconductor is a high-efficiency, glass-passivated silicon rectifier diode rated for 1 A average forward current and 400 V repetitive peak reverse voltage (V_RRM), with low 1.3 V forward voltage at 1 A and 25°C, 50 ns reverse recovery time, and DO-204AL (DO-41) package - used in DC/DC converters and freewheeling paths in switching power supplies.

For engineers reviewing the HER105G datasheet, HER105G pinout, HER105G application, or HER105G equivalent, key selection criteria include verified V_RRM = 400 V, I_F = 1 A, t_rr = 50 ns, V_F = 1.3 V @ 1 A, and thermal resistance R_θJA = 60 °C/W - all confirmed for this exact variant within the HER101G–HER108G family.

Technical Context

This single-die, axial-leaded rectifier operates as a unidirectional current switch with cathode-band polarity indication, optimized for high-frequency switching-mode power conversion where fast recovery and low conduction loss are critical. Its glass-passivated junction ensures stable performance under thermal cycling and humidity stress.

The device supports surge currents up to 30 A (8.3 ms half-sine) and maintains reliable operation across –55°C to +150°C junction temperature range, with junction-to-ambient thermal resistance of 60 °C/W enabling compact board-level thermal design without forced cooling in typical 1 A applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - maximum non-repetitive reverse voltage the diode blocks reliably in circuit; defines usable input voltage range in flyback or buck-derived topologies
I_F	1 A - continuous average forward current rating; determines minimum trace width and heatsinking for steady-state conduction
t_rr	50 ns - reverse recovery time measured at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A; enables operation up to ~2 MHz switching frequency before significant switching loss dominates
V_F	1.3 V @ 1 A, 25°C - forward voltage drop directly impacts conduction loss (P_cond ≈ 1.3 W at full load), influencing efficiency and thermal budget
C_J	15 pF @ 1 MHz, V_R = 4.0 V - junction capacitance affects high-frequency noise coupling and snubber design in hard-switched converters
R_θJA	60 °C/W - junction-to-ambient thermal resistance; with 1.3 W dissipation, expected ΔT ≈ 78°C above ambient - guides PCB copper area and airflow requirements

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, glass-passivated silicon die in molded epoxy case with pure tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Polarity indicated by cathode band.

Pin/Terminal	Circuit Role	Design Meaning
Anode (lead without band)	Forward current entry point	Connected to lower-potential node (e.g., switch node in boost, source in synchronous rectification); must handle full I_F and I_FSM
Cathode (lead with band)	Forward current exit / reverse voltage blocking terminal	Connected to higher-potential rail (e.g., output capacitor positive); withstands up to 400 V reverse bias during off-state

Key Features

Feature	Design Value
Glass-passivated junction	Enables stable leakage current (<5 µA @ 25°C) and long-term reliability under humid or thermally cycled conditions without hermetic sealing
Low V_F = 1.3 V @ 1 A	Reduces conduction loss by ~23% vs. standard 1N4007 (V_F ≈ 1.7 V), improving efficiency in 5–24 V output DC/DC stages
t_rr = 50 ns	Minimizes reverse recovery charge (Q_rr) and associated switching losses in 100 kHz–1 MHz SMPS designs, reducing EMI generation
AEC-Q101 qualified option available	Supports automotive-grade qualification path (HER105GH) for under-hood and infotainment power supply applications requiring stress-tested reliability

Applications

DC/DC Converters	Switching Inverters
Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–48 V outputs at ≤1 A. IC Role / Device Role / Timing Role: Unidirectional current valve converting high-frequency AC from transformer secondary into regulated DC output. Use Value: 1.3 V V_F and 50 ns t_rr reduce both conduction and switching losses, enabling >88% efficiency at light-to-moderate loads without active synchronous rectification.	Use Scenario: Freewheeling path in H-bridge motor inverters driving 24–48 V BLDC or stepper motors. IC Role / Device Role / Timing Role: Provides low-loss return path for inductive kickback current when upper switches turn off. Use Value: 30 A I_FSM withstands motor startup surges; 400 V V_RRM accommodates bus voltages up to 320 V DC-link with margin.
AC-DC Adapters	Industrial Power Supplies
Use Scenario: Output rectification in compact wall adapters for consumer electronics (e.g., routers, set-top boxes). IC Role / Device Role / Timing Role: Final-stage rectifier converting transformer secondary AC to low-voltage DC before linear or LDO regulation. Use Value: DO-41 package fits tight board space; RoHS/halogen-free compliance meets global regulatory requirements for mass-market devices.	Use Scenario: Input bridge or output stage in programmable logic controller (PLC) power modules operating in harsh industrial environments. IC Role / Device Role / Timing Role: High-reliability rectifier handling continuous 1 A load with exposure to vibration, wide temperature swings, and electrical transients. Use Value: –55°C to +150°C operating range and JESD 201 Class 2 whisker resistance ensure long-term stability in uncontrolled ambient conditions.

DC/DC Converters

Switching Inverters

Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 5–48 V outputs at ≤1 A.

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

Use Value: 1.3 V V_F and 50 ns t_rr reduce both conduction and switching losses, enabling >88% efficiency at light-to-moderate loads without active synchronous rectification.

Use Scenario: Freewheeling path in H-bridge motor inverters driving 24–48 V BLDC or stepper motors.

IC Role / Device Role / Timing Role: Provides low-loss return path for inductive kickback current when upper switches turn off.

Use Value: 30 A I_FSM withstands motor startup surges; 400 V V_RRM accommodates bus voltages up to 320 V DC-link with margin.

AC-DC Adapters

Industrial Power Supplies

Use Scenario: Output rectification in compact wall adapters for consumer electronics (e.g., routers, set-top boxes).

IC Role / Device Role / Timing Role: Final-stage rectifier converting transformer secondary AC to low-voltage DC before linear or LDO regulation.

Use Value: DO-41 package fits tight board space; RoHS/halogen-free compliance meets global regulatory requirements for mass-market devices.

Use Scenario: Input bridge or output stage in programmable logic controller (PLC) power modules operating in harsh industrial environments.

IC Role / Device Role / Timing Role: High-reliability rectifier handling continuous 1 A load with exposure to vibration, wide temperature swings, and electrical transients.

Use Value: –55°C to +150°C operating range and JESD 201 Class 2 whisker resistance ensure long-term stability in uncontrolled ambient conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R04	V_RRM = 400 V, I_F = 1 A, t_rr = 35 ns, V_F = 1.15 V @ 1 A - faster recovery and lower V_F, but higher cost and no AEC-Q101 option	Better suited for ultra-high-frequency (>500 kHz) or ultra-low-loss designs where 0.15 V V_F reduction justifies premium pricing	Select STTH1R04 only if t_rr < 40 ns is required and cost sensitivity is low; HER105G remains optimal for cost-constrained 100–300 kHz industrial converters
1N5622	V_RRM = 400 V, I_F = 1 A, t_rr = 100 ns, V_F = 1.4 V @ 1 A - slower recovery, higher V_F, legacy DO-41 part with no AEC-Q101 path	Acceptable for line-frequency or low-frequency (<50 kHz) rectification where recovery loss is negligible	Choose 1N5622 only for legacy redesigns or non-critical applications; HER105G delivers measurable efficiency gain in modern SMPS due to 50% faster t_rr and 0.1 V lower V_F

Compared with STTH1R04 and 1N5622, HER105G offers the best balance of speed (50 ns), conduction loss (1.3 V), qualification readiness (AEC-Q101 option), and cost for mainstream 100–300 kHz switching power supplies - making it the preferred choice where reliability, efficiency, and supply chain continuity are jointly prioritized.

Availability

HER105G is available at Aetrix Electronics and suitable for DC/DC converters, switching inverters, and industrial power supplies requiring stable component supply, consistent parametric performance, and long-term manufacturing support.

Supply support for HER105G 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 since 1979.

The HER101G–HER108G series was designed specifically for high-efficiency, high-reliability AC/DC and DC/DC power conversion in industrial, computing, and automotive auxiliary systems - emphasizing fast recovery, low forward drop, and robust thermal performance in standard DO-41 packaging.

FAQ

What is the repetitive peak reverse voltage (V_RRM) rating for HER105G?

The HER105G has a repetitive peak reverse voltage (V_RRM) rating of 400 V, as explicitly specified in the "ABSOLUTE MAXIMUM RATINGS" table for the HER105G row. This value is fixed per variant and not shared across the HER101G–HER108G family - HER105G is distinct from HER104G (300 V) and HER106G (600 V). The 400 V rating defines its safe blocking capability in circuits such as flyback transformer secondaries or DC-link freewheeling paths.

What is the forward voltage (V_F) of HER105G at 1 A and 25°C?

The forward voltage (V_F) of HER105G is 1.3 V at 1 A forward current and 25°C junction temperature, per the "ELECTRICAL SPECIFICATIONS" table. This value is specific to HER105G and differs from adjacent variants (e.g., HER104G = 1.0 V, HER106G = 1.7 V). It directly determines conduction loss (P = I × V_F ≈ 1.3 W), impacting thermal design and efficiency in continuous 1 A applications.

Does HER105G have a qualified AEC-Q101 version?

Yes - the AEC-Q101 qualified version of HER105G is designated HER105GH, as noted in the "ORDERING INFORMATION" section. The "H" suffix indicates full AEC-Q101 stress testing compliance, including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress test. HER105G itself is the standard industrial-grade variant; HER105GH is the automotive-qualified option with identical electrical specs and DO-41 packaging.

What is the reverse recovery time (t_rr) of HER105G, and under what test conditions?

The reverse recovery time (t_rr) of HER105G is 50 ns, measured under the defined conditions: forward current I_F = 0.5 A, reverse current I_R = 1.0 A, and reverse recovery current I_rr = 0.25 A. This value is confirmed in the "ELECTRICAL SPECIFICATIONS" table for HER105G and distinguishes it from slower variants (e.g., HER108G = 75 ns) and faster alternatives (e.g., STTH1R04 = 35 ns). It reflects real-world switching behavior in hard-commutated topologies.

What package type does HER105G use, and are its leads lead-free?

HER105G uses the DO-204AL (DO-41) axial-leaded package, as stated in "MECHANICAL DATA" and "ORDERING INFORMATION". Its leads are pure tin plated and fully compliant with J-STD-002 solderability requirements. The device is RoHS-compliant and halogen-free per IEC 61249-2-21, confirming lead-free construction. Polarity is marked by a visible cathode band on the body, and weight is approximately 0.330 g.

HER105G 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):: 400 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 1 A

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

Reverse Recovery Time (trr):: 50 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 400 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

HER105G FAQ

1.How can I place an order for HER105G through Aetrix?

Please submit a Request for Quotation (RFQ) for HER105G 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 HER105G reliable?

The price and inventory of HER105G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER105G is usually 5 days.

3.What payment methods are accepted for HER105G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER105G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HER105G?

HER105G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HER105G 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 HER105G?

For technical support, including HER105G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER105G requirements.

6.How does Aetrix verify that HER105G is sourced from the original manufacturer or authorized distributors?

All HER105G 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 HER105G meets industry standards.

7.What is the process for return or replacement of HER105G?

All HER105G units undergo pre-shipment inspection (PSI). If there is an issue with HER105G, 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 HER105G part is unused and in its original packaging.

Return procedure for HER105G:

1.Submit a request within 90 days.

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

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