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Taiwan Semiconductor Corporation HER304G-K
- Part No.:
- HER304G-K
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
HER304G-K.pdf
- Description:
- 50NS, 3A, 300V, HIGH EFFICIENT R
- Quantity:
- Payment:
- Shipping:
Inventory:8,090
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Product details
Overview
HER304G-K from Taiwan Semiconductor is a high-efficiency, single-die silicon rectifier diode in DO-201AD package, rated for 3A average forward current, 300V repetitive peak reverse voltage (VRRM), and 125A surge current (IFSM). It delivers low 1.0V forward voltage at 3A/25°C and exhibits 50ns reverse recovery time, making it suitable for switching-mode power supplies and freewheeling paths in DC-DC converters.
For engineers reviewing the HER304G-K datasheet, HER304G-K pinout, HER304G-K application, or HER304G-K equivalent, key selection factors include its VRRM=300V rating, VF=1.0V @3A, trr=50ns, RθJL=10°C/W thermal resistance, and DO-201AD mechanical compatibility with high-reliability industrial and automotive-grade power conversion designs.
Technical Context
This device operates as a unidirectional, high-speed switching rectifier optimized for high-frequency switching topologies. Its 50ns reverse recovery time and low junction capacitance (60pF @1MHz, VR=4V) minimize switching losses and EMI generation during turn-off transitions in SMPS flyback and forward converters.
The DO-201AD package provides robust thermal performance (RθJA=35°C/W, RθJL=10°C/W) and supports lead-free soldering per J-STD-002, with pure tin-plated leads and UL 94V-0 molding compound - enabling reliable operation up to 150°C junction temperature in space-constrained power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - Maximum non-repetitive reverse voltage the diode blocks without breakdown; defines usable input voltage range in AC/DC or DC-DC stage |
| IF(AV) | 3 A - Continuous average forward current capability at TC=75°C; determines steady-state power handling in conduction path |
| VF @3A | 1.0 V - Forward voltage drop at rated current and 25°C; directly impacts conduction loss (P = IF × VF) and thermal design |
| trr | 50 ns - Reverse recovery time under IF=0.5A, IR=1.0A, Irr=0.25A; critical for minimizing switching loss and ringing in high-frequency converters |
| IFSM | 125 A - Peak non-repetitive surge current (8.3ms half-sine); ensures survivability during startup or overload transients |
| RθJL | 10 °C/W - Junction-to-lead thermal resistance; enables direct heatsinking via PCB copper or clip-mounting for thermal management |
Pinout & Package
HER304G-K uses the DO-201AD axial-leaded package with cathode indicated by a band on the body. Leads are pure tin-plated and solderable per J-STD-002. The device has two terminals: anode and cathode - no internal connections or auxiliary pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of rectification path (e.g., transformer secondary or switch node) |
| Cathode | Forward current exit point | Marked with band; connects to output rail or energy storage capacitor; carries full load current to load |
Key Features
| Feature | Design Value |
|---|---|
| High surge current capability | 125A IFSM withstands inrush and fault currents without failure - essential for robust front-end rectification |
| Low forward voltage | 1.0V VF @3A reduces conduction loss by ~15% vs. standard FR series - improves efficiency in 12–48V output converters |
| Fast reverse recovery | 50ns trr limits switching loss and dv/dt-induced shoot-through risk in synchronous or quasi-resonant topologies |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS - meets environmental compliance requirements for global industrial shipments |
Applications
| DC-DC Converter Output Rectification | Switching Mode Inverter Freewheeling |
|---|---|
Use Scenario: Used in secondary-side synchronous or diode rectification of isolated DC-DC converters delivering 5–24V at up to 3A. IC Role / Device Role / Timing Role: Unidirectional power switch conducting during positive half-cycle; blocks reverse voltage during off-time. Use Value: 1.0V VF minimizes output-stage conduction loss; 50ns trr suppresses voltage spikes across MOSFETs during commutation. | Use Scenario: Placed across inductive loads (e.g., motor windings or relay coils) in H-bridge inverters operating at 20–100kHz. IC Role / Device Role / Timing Role: Freewheeling diode providing low-impedance path for inductive current decay when main switches turn off. Use Value: 125A IFSM handles transient energy dump; DO-201AD mechanical robustness sustains repeated surge stress over lifetime. |
| AC-DC Adapter Input Bridge Leg | Industrial Power Supply Snubber Network |
Use Scenario: One leg of a four-diode bridge rectifier converting 85–265VAC mains to bulk DC in compact wall adapters (≤60W). IC Role / Device Role / Timing Role: Half-wave rectifier conducting during positive AC half-cycles; blocks negative half-cycles. Use Value: 300V VRRM provides 2× safety margin over 265VAC peak (375V); 150°C TJ max supports sealed enclosure thermal environments. | Use Scenario: Integrated into RC snubber networks across IGBTs or MOSFETs in motor drives and UPS systems. IC Role / Device Role / Timing Role: Clamping diode absorbing turn-off voltage overshoot by diverting reactive energy to snubber capacitor. Use Value: 60pF junction capacitance stabilizes snubber resonance frequency; low VF ensures minimal leakage during clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH3L03S | VRRM=300V, VF=1.05V @3A, trr=45ns, DO-201AD package | Slightly faster recovery but higher VF; same thermal metrics | Preferred where ultra-low trr dominates over conduction loss |
| ON Semi MUR330 | VRRM=300V, VF=1.15V @3A, trr=55ns, DO-201AD package | Higher VF increases conduction loss; wider trr tolerance band | Acceptable where cost sensitivity outweighs 50mV VF advantage |
Compared with STTH3L03S and MUR330, HER304G-K offers the lowest VF (1.0V) among 300V/3A DO-201AD rectifiers, delivering optimal efficiency in thermally constrained 24V-output SMPS while maintaining identical footprint and assembly compatibility.
Availability
HER304G-K is available at Aetrix Electronics and suitable for DC-DC converter output rectification, switching mode inverter freewheeling, and AC-DC adapter input bridge legs requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for HER304G-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 devices, rectifiers, TVS diodes, and LED drivers since 1979.
The HER30xG-K series was developed specifically for high-efficiency, high-reliability AC/DC and DC/DC power conversion in industrial, telecom, and consumer power supplies - emphasizing low VF, fast trr, and rugged packaging for extended thermal and surge endurance.
FAQ
What is the maximum junction temperature rating for HER304G-K?
The HER304G-K has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings table. This allows continuous operation in high-ambient environments such as enclosed power supplies or motor drive cabinets. Derating curves in the datasheet specify that average forward current must be reduced to 1.8A at TC=100°C to maintain safe thermal margins for HER304G-K.
Does HER304G-K support lead-free reflow soldering?
Yes, HER304G-K features pure tin-plated leads compliant with J-STD-002 for solderability and qualified for lead-free reflow processes. Its DO-201AD package uses UL 94V-0 molding compound and passes JESD201 Class 1A whisker testing - confirming suitability for RoHS-compliant automated assembly lines using HER304G-K.
What is the reverse recovery time (trr) test condition for HER304G-K?
The reverse recovery time for HER304G-K is measured under IF = 0.5A, IR = 1.0A, and Irr = 0.25A, per the electrical specifications table. This standardized condition ensures consistent comparison across fast rectifiers. The typical trr value is 50ns, with no maximum specified - indicating guaranteed performance within this limit for HER304G-K.
Is HER304G-K pin-compatible with other DO-201AD rectifiers like 1N5408?
HER304G-K shares the DO-201AD package outline and axial lead configuration with 1N5408, but differs electrically: HER304G-K offers 300V VRRM, 1.0V VF, and 50ns trr versus 1N5408's 1000V VRRM, 1.2V VF, and >2000ns trr. Mechanical fit is identical, but circuit-level substitution requires validation of voltage, speed, and thermal requirements for HER304G-K.
What marking code identifies HER304G-K on the device body?
The HER304G-K is marked on the device body as "HER304G", followed by date code and factory identifier per the marking diagram. The "G" suffix denotes green (halogen-free) compound, and the "K" in the ordering code indicates tape-and-reel packaging - both confirmed in the official Taiwan Semiconductor ordering information for HER304G-K.
HER304G-K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 300 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 300 V
- Capacitance @ Vr, F:
- 60pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -55°C ~ 150°C
HER304G-K FAQ
1.How can I place an order for HER304G-K through Aetrix?
Please submit a Request for Quotation (RFQ) for HER304G-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 HER304G-K reliable?
The price and inventory of HER304G-K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER304G-K is usually 5 days.
3.What payment methods are accepted for HER304G-K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER304G-K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HER304G-K?
HER304G-K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HER304G-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 HER304G-K?
For technical support, including HER304G-K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER304G-K requirements.
6.How does Aetrix verify that HER304G-K is sourced from the original manufacturer or authorized distributors?
All HER304G-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 HER304G-K meets industry standards.
7.What is the process for return or replacement of HER304G-K?
All HER304G-K units undergo pre-shipment inspection (PSI). If there is an issue with HER304G-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 HER304G-K part is unused and in its original packaging.
Return procedure for HER304G-K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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