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Taiwan Semiconductor Corporation HER104G
- Part No.:
- HER104G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
HER104G.pdf
- Description:
- DIODE GEN PURP 300V 1A DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,597
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Product details
Overview
HER104G from Taiwan Semiconductor is a high-efficiency, glass-passivated silicon rectifier diode rated for 300 V repetitive peak reverse voltage (VRRM), 1 A average forward current (IF), and 30 A non-repetitive surge current (IFSM), with 1.0 V forward voltage at 1 A and 25°C - used in DC-DC converters and switching-mode power supplies.
For engineers reviewing the HER104G datasheet, HER104G pinout, HER104G application, or HER104G equivalent, key selection criteria include its DO-41 package, 50 ns reverse recovery time (trr), 15 pF junction capacitance at 1 MHz/4 V, 60 °C/W junction-to-ambient thermal resistance, and AEC-Q101 qualification availability in variant HER104GH.
Technical Context
This single-die, axial-leaded rectifier operates as a unidirectional conduction device in high-frequency switching power stages. Its glass-passivated junction ensures stable leakage performance up to 125°C (IR = 150 µA) and supports reliable freewheeling in flyback and boost topologies.
The HER104G delivers low conduction loss (VF = 1.0 V @ 1 A) and fast switching response (trr = 50 ns), enabling efficient operation in 50–500 kHz SMPS designs where thermal management and reverse recovery are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - maximum repetitive reverse voltage before breakdown; defines safe operating range in 24–48 V output DC-DC stages |
| IF | 1 A - continuous average forward current; sets minimum heatsinking requirement for sustained load conditions |
| IFSM | 30 A - peak non-repetitive surge rating; withstands inrush during cold-start or short-circuit recovery |
| VF @ 1 A, 25°C | 1.0 V - forward voltage drop; determines conduction loss of ~1.0 W at full load |
| trr | 50 ns - reverse recovery time; enables stable operation up to ~500 kHz without excessive switching loss |
| CJ @ 1 MHz, 4 V | 15 pF - junction capacitance; limits high-frequency displacement current and EMI generation |
| RθJA | 60 °C/W - thermal resistance from junction to ambient; requires ≤ 75°C ambient for 150°C max junction temp at full IF |
Pinout & Package
Package: DO-204AL (DO-41), axial leaded, glass-passivated silicon die, cathode indicated by band, RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward current entry point | Connected to lower-potential node (e.g., switch node in boost, source in synchronous rectification) |
| Cathode (banded end) | Forward current exit / reverse blocking terminal | Connected to output rail or filter capacitor; blocks reverse voltage up to 300 V |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable IR < 5 µA at 25°C and < 150 µA at 125°C, reducing standby leakage in energy-sensitive designs |
| 50 ns reverse recovery time | Minimizes switching loss and ringing in high-frequency converters (e.g., 300–500 kHz QR flyback) |
| 15 pF junction capacitance | Limits capacitive coupling noise and improves EMI profile vs. slower rectifiers (e.g., 1N4007: ~30 pF) |
| DO-41 mechanical robustness | Meets JESD201 Class 2 whisker test and UL 94V-0 flammability, supporting industrial and automotive-grade reliability |
Applications
| DC-DC Converter | Switching Inverter |
|---|---|
Use Scenario: Secondary-side rectification in isolated 12 V/1 A offline flyback converter powering IoT gateway logic rails. IC Role / Device Role / Timing Role: High-efficiency unidirectional current path delivering regulated output while minimizing conduction and switching losses. Use Value: 1.0 V VF and 50 ns trr reduce total power loss by ~18% versus standard 1N4007 in same layout, improving thermal margin. | Use Scenario: Freewheeling diode across IGBT in 48 V battery-fed motor drive inverter stage. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during IGBT turn-off, clamping inductive kickback. Use Value: 30 A IFSM withstands motor stall surges; 300 V VRRM covers bus voltage + safety margin in 48 V systems. |
| AC-DC Adapter | Industrial Power Supply |
Use Scenario: Output rectification in compact 5 V/2 A USB-C adapter using quasi-resonant topology. IC Role / Device Role / Timing Role: Fast-recovery rectifier synchronized with primary-side switching to minimize reverse recovery spikes. Use Value: 15 pF CJ reduces high-frequency noise injection into output filter, easing EMI compliance (CISPR 32 Class B). | Use Scenario: Input bridge leg in 24 V/5 A DIN-rail mounted PLC power module. IC Role / Device Role / Timing Role: Handles line-frequency rectification with high surge tolerance during AC input transients. Use Value: Glass passivation and 150°C TJ max ensure >10-year life under continuous 60°C ambient industrial operation. |
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 | VRRM = 400 V, VF = 1.15 V @ 1 A, trr = 45 ns, DO-41 package | Higher VRRM suits 48 V systems; slightly higher VF increases conduction loss | Prefer when 400 V rating is required and 45 ns trr provides marginal EMI advantage |
| ON Semi MUR1040 | VRRM = 400 V, VF = 1.25 V @ 1 A, trr = 35 ns, DO-41 package | Faster trr but higher VF; optimized for ultra-high-frequency SMPS (>1 MHz) | Select only if system operates >600 kHz and can tolerate +0.25 V VF penalty |
Compared with STTH1R04 and MUR1040, the HER104G offers the lowest VF (1.0 V) in the 300 V class, making it optimal for thermally constrained 1 A DC-DC outputs where conduction loss dominates over switching loss.
Availability
HER104G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial power supplies requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for HER104G 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, serving industrial, computing, and consumer markets since 1979.
The HER101G–HER108G family is designed for high-efficiency, high-reliability rectification in space-constrained power conversion systems - emphasizing low VF, fast trr, and robust thermal performance in standard DO-41 packaging.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) for HER104G?
The HER104G has a VRRM rating of 300 V, meaning it reliably blocks reverse voltages up to this level without breakdown. This value is fixed per the datasheet's absolute maximum ratings table and applies across the full operating temperature range. Exceeding 300 V risks irreversible junction failure. The HER104G is part of a series where '104' directly encodes the 300 V rating (HER101G = 50 V, HER102G = 100 V, etc.).
What is the forward voltage drop (VF) of HER104G at 1 A and 25°C?
The HER104G exhibits a typical forward voltage of 1.0 V at 1 A and 25°C, as specified in the electrical characteristics table. This value is measured under pulsed conditions (PW = 0.3 ms) to avoid self-heating effects. At elevated temperatures or higher currents, VF decreases slightly due to negative temperature coefficient of silicon diodes, but design margins should be based on the 1.0 V typ value.
Does HER104G have AEC-Q101 qualification?
The base HER104G is not AEC-Q101 qualified; however, the variant HER104GH is explicitly listed as AEC-Q101 qualified in the ordering information section. HER104GH shares identical electrical and thermal specs but adds automotive-grade process controls and testing. For automotive applications, HER104GH must be specified - HER104G alone does not meet AEC-Q101 requirements.
What is the reverse recovery time (trr) of HER104G, and under what conditions is it measured?
The HER104G has a maximum reverse recovery time (trr) of 50 ns, measured under the condition IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A. This test reflects real-world switching behavior in flyback and forward converters. The 50 ns value places HER104G in the "ultrafast" rectifier category, distinguishing it from general-purpose diodes like 1N4007 (trr > 2 µs).
What package type does HER104G use, and what are its key mechanical features?
The HER104G uses the DO-204AL (DO-41) axial-leaded package, with pure tin-plated leads compliant with J-STD-002 solderability standards and passing JESD201 Class 2 whisker testing. The molding compound meets UL 94V-0 flammability, and polarity is marked by a visible cathode band. Its weight is approximately 0.330 g, and it supports manual or automated through-hole assembly.
HER104G 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 FAQ
1.How can I place an order for HER104G through Aetrix?
Please submit a Request for Quotation (RFQ) for HER104G 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 reliable?
The price and inventory of HER104G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER104G is usually 5 days.
3.What payment methods are accepted for HER104G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER104G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HER104G?
HER104G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HER104G 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?
For technical support, including HER104G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER104G requirements.
6.How does Aetrix verify that HER104G is sourced from the original manufacturer or authorized distributors?
All HER104G 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 meets industry standards.
7.What is the process for return or replacement of HER104G?
All HER104G units undergo pre-shipment inspection (PSI). If there is an issue with HER104G, 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 part is unused and in its original packaging.
Return procedure for HER104G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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