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Taiwan Semiconductor Corporation HER205G-T
- Part No.:
- HER205G-T
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
HER205G-T.pdf
- Description:
- 50NS, 2A, 400V, HIGH EFFICIENT R
- Quantity:
- Payment:
- Shipping:
Inventory:6,806
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Product details
Overview
HER205G-T from Taiwan Semiconductor is a 2A, 400V fast recovery rectifier diode in DO-204AC (DO-15) package, featuring 1.3V forward voltage at 2A/25°C, 50ns reverse recovery time, and 5µA reverse leakage at 25°C - used in switching-mode power supplies for freewheeling and output rectification.
For engineers reviewing the HER205G-T datasheet, HER205G-T pinout, HER205G-T application, or HER205G-T equivalent, key selection criteria include VRRM=400V, IFSM=60A surge rating, TJ(max)=150°C, RθJA=60°C/W thermal resistance, and DO-15 mechanical compatibility with high-reliability DC-DC converters.
Technical Context
This single-die, glass-passivated fast recovery rectifier operates with low conduction loss and controlled reverse recovery behavior, enabling efficient high-frequency switching in SMPS topologies. Its 50ns trr and 1.3V VF at rated current support reduced switching losses compared to standard recovery diodes.
The device uses pure tin-plated leads compliant with J-STD-002, meets JESD 201 Class 1A whisker resistance, and is RoHS- and halogen-free per IEC 61249-2-21 - suitable for industrial-grade power conversion where thermal stability and lead-free assembly are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - maximum repetitive reverse voltage; defines safe blocking capability in 400V-rated output stages |
| IF(AV) | 2 A - average forward current; supports continuous 2A DC output in TO-220 or PCB-mounted heatsink designs |
| IFSM | 60 A - non-repetitive surge current; withstands 8.3ms half-sine surges during startup or fault conditions |
| VF @ 2A, 25°C | 1.3 V - forward voltage drop; determines conduction loss of ~2.6W at full load, impacting thermal design |
| trr | 50 ns - reverse recovery time; limits minimum switching frequency and reduces EMI in >50kHz converters |
| TJ(max) | 150 °C - maximum junction temperature; enables operation in enclosed, high-ambient environments up to 100°C with proper derating |
| CJ @ 4V | 35 pF - junction capacitance at 4V reverse bias; affects high-frequency snubber and ringing behavior |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, glass-passivated, cathode indicated by band. Weight: 0.400g. UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., switch node or transformer secondary center-tap) |
| Cathode | Forward current exit / reverse blocking terminal | Connected to output rail or filter capacitor positive; polarity marked by band |
Key Features
| Feature | Design Value |
|---|---|
| Fast recovery time | 50 ns trr enables clean turn-off in 100–500 kHz SMPS without excessive switching loss or voltage overshoot |
| Glass passivated junction | Enhances moisture resistance and long-term reliability under humid or thermally cycled conditions |
| Low forward voltage | 1.3 V at 2A reduces conduction loss by ~15% vs. comparable 1N5408 (1.2V spec but higher real-world VF at temp) |
| High surge rating | 60A IFSM accommodates inrush currents in offline AC-DC front-ends without degradation |
| RoHS & halogen-free | Complies with IEC 61249-2-21; supports green manufacturing and end-of-life recycling requirements |
Applications
| DC-DC Converter Output Rectification | Switch-Mode Inverter Freewheeling |
|---|---|
Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering 12–48V DC output. IC Role / Device Role / Timing Role: Fast recovery rectifier conducting during transformer reset phase; blocks reverse voltage during primary switch on-time. Use Value: 400V VRRM safely handles reflected transients; 50ns trr minimizes reverse recovery charge loss, improving efficiency above 100kHz. | Use Scenario: Freewheeling path across inductive loads (e.g., motor windings or relay coils) in H-bridge inverters. IC Role / Device Role / Timing Role: Provides low-loss return path for inductive current when main switches turn off. Use Value: 60A IFSM absorbs high-energy flyback spikes; 1.3V VF limits heat generation during sustained freewheeling pulses. |
| AC-DC Adapter Secondary Rectification | Industrial Power Supply Input Stage |
Use Scenario: Output rectification in universal-input (90–264VAC) 15–65W adapters powering consumer electronics. IC Role / Device Role / Timing Role: Converts transformer secondary AC to regulated DC; operates in discontinuous conduction mode (DCM). Use Value: DO-15 package fits compact layouts; 5µA IR at 25°C ensures minimal standby leakage in energy-efficient designs. | Use Scenario: Bulk rectification in 200–400W industrial PSUs with active PFC front-end and LLC resonant stage. IC Role / Device Role / Timing Role: Handles high peak currents during line-voltage zero-crossings and transient overloads. Use Value: 150°C TJ(max) and 60°C/W RθJA allow reliable operation with minimal heatsinking in convection-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH2R04 | VRRM=400V, VF=1.35V@2A, trr=45ns, DO-204AC package | Slightly faster recovery but higher VF; same thermal profile and footprint | Preferable where EMI reduction is critical and 50mV VF penalty is acceptable |
| ON Semi MUR240 | VRRM=400V, VF=1.25V@2A, trr=60ns, DO-204AC package | Lower VF improves conduction efficiency but slower recovery increases switching loss at >200kHz | Better for lower-frequency (<100kHz), high-current applications where thermal margin is constrained |
Compared with STTH2R04 and MUR240, the HER205G-T offers balanced performance: its 50ns trr and 1.3V VF provide optimal trade-off between switching and conduction loss in mid-frequency SMPS (100–300kHz), while maintaining identical DO-15 mounting and thermal interface.
Availability
HER205G-T is available at Aetrix Electronics and suitable for DC-DC converters, switching-mode inverters, and freewheeling applications requiring stable component supply, consistent parametric performance, and long-term industrial availability.
Supply support for HER205G-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 rectifiers, TVS diodes, MOSFETs, and power ICs.
The HER20xG-T series was designed specifically for high-efficiency, high-reliability AC-DC and DC-DC power conversion systems demanding fast recovery, low VF, and robust surge handling in compact axial packages.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) for HER205G-T?
The HER205G-T has a VRRM of 400 V, meaning it can reliably block up to 400 volts of reverse voltage in repetitive operation. This rating is confirmed in the absolute maximum ratings table for the HER205G-T specifically - not extrapolated from adjacent variants. Designers must ensure circuit transient voltages remain below this value with appropriate safety margin.
What is the forward voltage drop of HER205G-T at 2A and 25°C?
The HER205G-T exhibits a typical forward voltage (VF) of 1.3 V at 2A and 25°C, as specified in the electrical characteristics table. This value is measured under pulsed conditions (PW = 0.3 ms) and represents conduction loss under nominal load - critical for thermal and efficiency calculations in power supply designs using the HER205G-T.
Does HER205G-T have a defined reverse recovery time, and what is its value?
Yes, the HER205G-T has a specified reverse recovery time (trr) of 50 ns, measured at IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A. This parameter is explicitly listed for HER205G-T in the electrical specifications table and directly impacts switching loss and EMI in high-frequency power converters using the HER205G-T.
What package type does HER205G-T use, and are its leads lead-free?
The HER205G-T uses the DO-204AC (DO-15) axial package with pure tin-plated leads that are solderable per J-STD-002 and RoHS-compliant. The device is halogen-free per IEC 61249-2-21, and its molding compound meets UL 94V-0 flammability rating - all verified in the mechanical data section for the HER205G-T variant.
What is the maximum junction temperature and thermal resistance of HER205G-T?
The HER205G-T has a maximum junction temperature (TJ(max)) of 150°C and a junction-to-ambient thermal resistance (RθJA) of 60°C/W under standard test conditions. These values are documented in the absolute maximum ratings and thermal performance sections and apply directly to the HER205G-T in DO-15 package with no heatsink.
HER205G-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):
- 400 V
- Current - Average Rectified (Io):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 400 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
HER205G-T FAQ
1.How can I place an order for HER205G-T through Aetrix?
Please submit a Request for Quotation (RFQ) for HER205G-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 HER205G-T reliable?
The price and inventory of HER205G-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER205G-T is usually 5 days.
3.What payment methods are accepted for HER205G-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER205G-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HER205G-T?
HER205G-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HER205G-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 HER205G-T?
For technical support, including HER205G-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER205G-T requirements.
6.How does Aetrix verify that HER205G-T is sourced from the original manufacturer or authorized distributors?
All HER205G-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 HER205G-T meets industry standards.
7.What is the process for return or replacement of HER205G-T?
All HER205G-T units undergo pre-shipment inspection (PSI). If there is an issue with HER205G-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 HER205G-T part is unused and in its original packaging.
Return procedure for HER205G-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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