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Taiwan Semiconductor Corporation HER104G-K
- Part No.:
- HER104G-K
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
HER104G-K.pdf
- Description:
- 50NS, 1A, 300V, HIGH EFFICIENT R
- Quantity:
- Payment:
- Shipping:
Inventory:5,446
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Product details
Overview
HER104G-K from Taiwan Semiconductor is a high-efficiency, single-die, glass-passivated silicon rectifier diode rated for 1 A average forward current, 300 V repetitive peak reverse voltage (VRRM), and 30 A non-repetitive surge current (IFSM), used in freewheeling and switching-mode power supply output stages.
For engineers reviewing the HER104G-K datasheet, HER104G-K pinout, HER104G-K application, or HER104G-K equivalent, key selection criteria include its 1.0 V forward voltage at 1 A/25°C, 50 ns reverse recovery time, DO-204AL (DO-41) package with cathode band polarity marking, and suitability for DC-DC converters requiring low conduction loss and fast recovery.
Technical Context
This device operates as a unidirectional power rectifier with a single PN junction optimized for high-speed switching in medium-voltage SMPS outputs. Its glass passivation ensures stable surface leakage performance up to 125°C junction temperature, while the pure tin-plated leads meet J-STD-002 solderability standards.
The thermal design envelope is defined by RθJA = 60°C/W and RθJC = 15°C/W, supporting continuous operation at full rated current with minimal heatsinking in ambient temperatures up to 75°C when mounted on FR-4 PCBs per JEDEC standard conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - Maximum repetitive reverse voltage before breakdown; sets safe operating limit in 24–48 V output rectification with margin |
| IF(AV) | 1 A - Continuous average forward current rating; defines maximum steady-state DC output capability |
| VF @ 1A, 25°C | 1.0 V - Forward voltage drop determines conduction loss (1.0 W typical at full load) |
| trr | 50 ns - Reverse recovery time enables efficient operation up to ~200 kHz switching frequencies |
| IFSM (8.3 ms) | 30 A - Surge current rating supports inrush and transient overload without failure |
| TJ max | +150°C - Maximum junction temperature allows reliable operation in enclosed industrial power supplies |
| CJ @ 1 MHz, 4 V | 15 pF - Junction capacitance impacts high-frequency switching noise and snubber design |
Pinout & Package
HER104G-K uses the DO-204AL (DO-41) axial-leaded package with cathode indicated by a colored band. Leads are pure tin-plated and compliant with J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward current entry point | Connects to lower-potential side (e.g., transformer secondary center-tap or switch node) |
| Cathode (banded end) | Forward current exit point | Connects to output filter capacitor positive rail; polarity must be observed to prevent reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable IR ≤ 5 µA at 25°C and ≤ 150 µA at 125°C under rated VR, reducing leakage-related standby loss |
| Low VF (1.0 V @ 1 A) | Minimizes I²R conduction loss in compact 1 A DC-DC outputs, improving efficiency over standard 1N400x series |
| Fast trr = 50 ns | Reduces switching loss and EMI generation compared to general-purpose rectifiers (e.g., 1N4007: trr > 2 µs) |
| DO-41 mechanical robustness | UL 94V-0 molding compound and JESD201 Class 1A whisker resistance support long-term reliability in vibration-prone industrial environments |
Applications
| DC-DC Converter Output Rectification | Switching Inverter Freewheeling |
|---|---|
Use Scenario: Secondary-side rectification in isolated 24 V input / 5–12 V output flyback or forward converters. IC Role / Device Role / Timing Role: Unidirectional current steering diode converting high-frequency AC from transformer into regulated DC output. Use Value: 1.0 V VF and 50 ns trr reduce conduction + switching losses, enabling >88% efficiency at 1 A load without active synchronous rectification. | Use Scenario: Freewheeling path across inductive loads (e.g., motor windings, solenoids) in half-bridge inverters. IC Role / Device Role / Timing Role: Clamp inductive kickback energy during MOSFET turn-off, preventing voltage overshoot. Use Value: 30 A IFSM withstands repeated inductive surges; 300 V VRRM provides margin above 24–48 V bus rails. |
| AC-DC Adapter Secondary Rectifier | Industrial Power Supply Hold-up Diode |
Use Scenario: Output rectification in universal-input (90–264 VAC) 5–19 V adapters powering consumer electronics. IC Role / Device Role / Timing Role: High-efficiency rectifier replacing slower, higher-VF alternatives in cost-sensitive designs. Use Value: RoHS- and halogen-free compliance meets global regulatory requirements; DO-41 form factor supports automated through-hole assembly. | Use Scenario: OR-ing diode between redundant 24 V DC power modules in PLC backplanes or DIN-rail systems. IC Role / Device Role / Timing Role: Prevents reverse current flow from healthy module to failed unit during hot-swap events. Use Value: 150°C TJ max and 60°C/W RθJA allow sustained operation under elevated ambient temperatures common in control cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R03U (STMicroelectronics) | Same 1 A / 300 V rating, but TO-220AC package; VF = 0.95 V, trr = 45 ns | Requires PCB footprint change and heatsink mounting; better for higher-power derating | Select if thermal budget is tight and board space allows TO-220; not drop-in for DO-41 layouts |
| ES1D (ON Semiconductor) | SOD-123 surface-mount package; 1 A / 200 V, VF = 0.92 V, trr = 35 ns | Limited to ≤200 V circuits; requires rework for SMT assembly and lacks IFSM margin | Prefer for space-constrained, lower-voltage (<200 V) designs where 30 A surge immunity is not required |
Compared with STTH1R03U and ES1D, HER104G-K offers the only through-hole, DO-41 packaged option with 300 V rating and 30 A surge capability-critical for legacy industrial power supplies where leaded reliability and serviceability are prioritized over miniaturization.
Availability
HER104G-K is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and freewheeling applications requiring stable component supply, long-lifecycle availability, and RoHS-compliant manufacturing.
Supply support for HER104G-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 diodes, and MOSFETs for industrial and computing markets.
The HER10xG-K family was designed specifically for high-efficiency, medium-voltage rectification in cost-sensitive switching power supplies-emphasizing low VF, fast trr, and robust thermal performance in standard DO-41 packaging.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) of HER104G-K?
The HER104G-K has a VRRM of 300 V, verified per Taiwan Semiconductor's B2104 datasheet. This rating defines the highest reverse voltage the diode can block repeatedly without breakdown, making it suitable for 24–48 V output stages with safety margin. It is part of the HER101G-K to HER108G-K series spanning 50 V to 1000 V ratings.
What is the forward voltage drop (VF) of HER104G-K at 1 A and 25°C?
The HER104G-K exhibits a typical forward voltage of 1.0 V at 1 A and 25°C, as specified in the Electrical Specifications table of the official datasheet. This value directly determines conduction loss (1.0 W at full load) and is lower than general-purpose rectifiers like 1N4004 (VF ≈ 1.1 V), improving efficiency in compact power supplies.
Does HER104G-K have a fast recovery time, and what is its value?
Yes, HER104G-K is a high-efficiency rectifier with a reverse recovery time (trr) of 50 ns, measured at IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A. This fast recovery enables clean switching in SMPS operating up to ~200 kHz and reduces switching loss and EMI compared to standard rectifiers with microsecond-scale trr.
What package type does HER104G-K use, and how is polarity marked?
HER104G-K uses the DO-204AL (DO-41) axial-leaded package. Polarity is marked by a cathode band on the banded end of the body; the unbanded end is the anode. The leads are pure tin-plated and comply with J-STD-002 solderability standards, supporting both wave and hand-soldering processes.
Is HER104G-K RoHS and halogen-free compliant?
Yes, HER104G-K is RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the FEATURES section of the Taiwan Semiconductor datasheet. The molding compound meets UL 94V-0 flammability rating, and the device passes JESD201 Class 1A whisker testing-ensuring environmental compliance and long-term reliability in industrial applications.
HER104G-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):
- 300 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 @ 300 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
HER104G-K FAQ
1.How can I place an order for HER104G-K through Aetrix?
Please submit a Request for Quotation (RFQ) for HER104G-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 HER104G-K reliable?
The price and inventory of HER104G-K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER104G-K is usually 5 days.
3.What payment methods are accepted for HER104G-K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER104G-K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HER104G-K?
HER104G-K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HER104G-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 HER104G-K?
For technical support, including HER104G-K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER104G-K requirements.
6.How does Aetrix verify that HER104G-K is sourced from the original manufacturer or authorized distributors?
All HER104G-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 HER104G-K meets industry standards.
7.What is the process for return or replacement of HER104G-K?
All HER104G-K units undergo pre-shipment inspection (PSI). If there is an issue with HER104G-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 HER104G-K part is unused and in its original packaging.
Return procedure for HER104G-K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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