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Taiwan Semiconductor Corporation HER308G B0G
- Part No.:
- HER308G B0G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
HER308G B0G.pdf
- Description:
- DIODE GEN PURP 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:8,157
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Product details
Overview
HER308G from Taiwan Semiconductor is a high-efficiency, ultra-fast recovery rectifier diode in DO-201AD package, rated for 3A average forward current, 1000V repetitive peak reverse voltage (VRRM), and 75ns reverse recovery time (trr). It serves as a primary output rectifier in high-frequency switching power supplies for industrial DC–DC converters and AC–DC adapters.
For engineers reviewing the HER308G datasheet, HER308G pinout, HER308G application, or HER308G equivalent, key selection criteria include its 1.7V max forward voltage at 3A, 125A surge capability, 10°C/W junction-to-lead thermal resistance, AEC-Q101 qualification option (HER308GH), and DO-201AD mechanical compatibility with legacy through-hole layouts.
Technical Context
The HER308G employs a single-die epitaxial planar construction optimized for fast soft-recovery behavior, minimizing switching losses in 50–500 kHz SMPS topologies. Its 1000V VRRM rating enables use in PFC stages and offline flyback secondary rectification where high voltage margin is required.
Thermal performance is defined by RθJL = 10°C/W and RθJA = 35°C/W, supporting reliable operation up to TJ = 150°C. Reverse leakage remains ≤10 µA at 25°C and ≤200 µA at 125°C under rated VR, ensuring low standby loss in energy-sensitive designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 1000 V - Withstands peak reverse voltage in 800 VAC input circuits or 600 VDC bus applications without breakdown. |
| IF | 3 A - Sustains continuous forward conduction in medium-power SMPS outputs (e.g., 12–48 V @ 25–100 W). |
| trr | 75 ns - Enables efficient operation in high-frequency converters (>200 kHz) with reduced switching loss and EMI. |
| VF (max) | 1.7 V @ 3 A, 25°C - Limits conduction loss to ≤5.1 W per device, critical for thermal management in compact enclosures. |
| IFSM | 125 A - Survives cold-start surges and transient overloads common in industrial power-up sequences. |
| RθJL | 10 °C/W - Allows direct heatsinking via PCB copper pour or clip-mounting to maintain junction temperature below 150°C at full load. |
Pinout & Package
DO-201AD axial-leaded package with cathode band marking; leads are pure tin-plated, J-STD-002 solderable, and meet JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry point | Connected to lower-potential node (e.g., transformer secondary center-tap or switch node in synchronous rectification). |
| Cathode (banded end) | Forward current exit / reverse blocking terminal | Connected to output rail; polarity marking ensures correct orientation during manual or automated placement. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast recovery (trr ≤ 75 ns) | Reduces switching loss and ringing in high-frequency converters, improving efficiency by 0.5–1.2% vs. standard FRDs. |
| Low VF (1.7 V max @ 3 A) | Minimizes I²R conduction loss, enabling smaller heatsinks or higher ambient operating temperatures. |
| AEC-Q101 qualified variant available (HER308GH) | Validated for automotive under-hood applications including engine control modules and ADAS power supplies. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally regulated electronics manufacturing. |
Applications
| Industrial DC–DC Converters | Offline AC–DC Adapters |
|---|---|
Use Scenario: Isolated 24 V/3 A output stage in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Output rectifier converting high-frequency transformer secondary AC to regulated DC. Use Value: 75 ns trr and 1.7 V VF reduce switching loss and thermal stress, extending MTBF beyond 100,000 hours. | Use Scenario: Secondary-side rectification in universal-input (90–264 VAC) laptop adapters. IC Role / Device Role / Timing Role: Freewheeling diode in quasi-resonant flyback topology. Use Value: 1000 V VRRM provides 2× safety margin over reflected output voltage spikes, eliminating need for snubbers. |
| Automotive Power Supplies | Renewable Energy Inverters |
Use Scenario: 12 V auxiliary supply in battery management systems (BMS) for EV traction batteries. IC Role / Device Role / Timing Role: Input rectifier for DC–DC converter fed from 48 V vehicle bus. Use Value: AEC-Q101-qualified HER308GH variant ensures reliability under 105°C ambient and vibration stress per ISO 16750. | Use Scenario: DC link rectification in micro-inverters for solar panel string outputs (up to 600 VDC). IC Role / Device Role / Timing Role: High-voltage freewheeling path during MPPT switching transitions. Use Value: 125 A IFSM withstands lightning-induced transients on rooftop PV arrays per IEC 61000-4-5 Level 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-HER308 | Identical VRRM (1000 V), IF (3 A), trr (75 ns), and DO-201AD package; VF slightly higher at 1.75 V max. | No AEC-Q101 variant offered; limited automotive qualification support. | Select for cost-sensitive industrial designs where AEC-Q101 is not required. |
| ON Semiconductor MUR3080CT | Dual common-cathode configuration (2×3 A), 800 V VRRM, 60 ns trr; TO-220AC package, not DO-201AD compatible. | Requires PCB redesign; suited for dual-output or interleaved converters, not single-diode replacement. | Choose only when dual-diode functionality or lower trr justifies layout change and thermal derating. |
Compared with VS-HER308, HER308G offers tighter VF tolerance and AEC-Q101 availability; versus MUR3080CT, it provides drop-in DO-201AD compatibility but trades off dual-diode integration and sub-60 ns recovery.
Availability
HER308G is available at Aetrix Electronics and suitable for industrial DC–DC converters, offline AC–DC adapters, and renewable energy inverters requiring stable component supply and long-term manufacturability.
Supply support for HER308G 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 global industrial, computing, and automotive markets since 1979.
The HER30xG series was designed specifically for high-efficiency, high-reliability rectification in switching-mode power supplies, emphasizing low VF, fast trr, and robust surge handling across 50–1000 V voltage grades.
FAQ
What is the maximum junction temperature rating for HER308G?
The HER308G has a maximum junction temperature (TJ) of +150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet (Version I2105). This allows operation in high-ambient environments such as enclosed industrial enclosures or under-hood automotive locations when properly heatsinked. Derating curves confirm usable current down to zero at 150°C case temperature.
Is HER308G pin-compatible with other HER30xG series diodes?
Yes, all HER301G through HER308G share identical DO-201AD package dimensions, lead spacing, and cathode-band polarity marking-making them mechanically interchangeable on the same footprint. However, electrical parameters differ significantly: HER308G is rated for 1000 V VRRM, while HER301G is only 50 V; substituting without circuit review risks catastrophic failure.
Does HER308G meet automotive qualification standards?
The base HER308G is not AEC-Q101 qualified, but Taiwan Semiconductor offers the HER308GH variant-identical electrically and mechanically-with full AEC-Q101 stress test compliance for temperature cycling, humidity bias, and mechanical shock. HER308GH is recommended for automotive power supply designs requiring qualification evidence.
What is the typical reverse recovery time (trr) of HER308G and how is it measured?
The HER308G has a maximum reverse recovery time (trr) of 75 ns, measured under conditions of IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A per the Taiwan Semiconductor datasheet. This value reflects soft-recovery behavior critical for reducing EMI and switching loss in high-frequency SMPS, and is validated using standardized double-pulse test circuits per JEDEC guidelines.
How does the forward voltage (VF) of HER308G vary with temperature and current?
HER308G exhibits a positive temperature coefficient for VF: at 3 A, VF is typically 1.5 V at 25°C and rises to ~1.65 V at 125°C. The datasheet specifies a maximum of 1.7 V at 25°C, with no upper limit given at elevated temperatures-designers must apply thermal derating and verify worst-case conduction loss using the provided forward characteristics curve (Fig.4) in the HER301G–HER308G datasheet.
HER308G B0G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 1000 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 1.7 V @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 75 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 1000 V
- Capacitance @ Vr, F:
- 35pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -55°C ~ 150°C
HER308G B0G FAQ
1.How can I place an order for HER308G B0G through Aetrix?
Please submit a Request for Quotation (RFQ) for HER308G B0G 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 HER308G B0G reliable?
The price and inventory of HER308G B0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER308G B0G is usually 5 days.
3.What payment methods are accepted for HER308G B0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER308G B0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HER308G B0G?
HER308G B0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HER308G B0G 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 HER308G B0G?
For technical support, including HER308G B0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER308G B0G requirements.
6.How does Aetrix verify that HER308G B0G is sourced from the original manufacturer or authorized distributors?
All HER308G B0G 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 HER308G B0G meets industry standards.
7.What is the process for return or replacement of HER308G B0G?
All HER308G B0G units undergo pre-shipment inspection (PSI). If there is an issue with HER308G B0G, 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 HER308G B0G part is unused and in its original packaging.
Return procedure for HER308G B0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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