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Taiwan Semiconductor Corporation HER305G A0G
- Part No.:
- HER305G A0G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
HER305G A0G.pdf
- Description:
- DIODE GEN PURP 400V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:697
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Product details
Overview
HER305G A0G from Taiwan Semiconductor is a high-efficiency, ultra-fast recovery silicon rectifier diode in DO-201AD package, rated for 3 A average forward current, 400 V repetitive peak reverse voltage (VRRM), and 1.3 V typical forward voltage at 3 A and 25°C. It delivers low power loss in DC-DC converters and switching-mode power supplies.
For engineers reviewing the HER305G A0G datasheet, HER305G A0G pinout, HER305G A0G application, or HER305G A0G equivalent, key selection criteria include its 50 ns reverse recovery time, 60 pF junction capacitance at 4.0 V, 125 A surge capability, 150°C max junction temperature, and AEC-Q101 qualification option (HER305GH).
Technical Context
This device is a single-die, planar-passivated, ultra-fast recovery rectifier optimized for high-frequency switching applications. Its 50 ns trr and low Qrr minimize switching losses in SMPS flyback and forward topologies.
The DO-201AD package provides robust thermal performance with RθJL = 10°C/W and RθJA = 35°C/W, enabling reliable operation up to 150°C junction temperature under continuous 3 A conduction with proper heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - supports 280 V RMS input rectification with 1.4× safety margin in offline SMPS |
| IF | 3 A - continuous DC output current capability without derating below 75°C case temperature |
| VF @ 3 A, 25°C | 1.3 V - contributes ≤3.9 W conduction loss at full load, enabling high-efficiency designs |
| trr | 50 ns - reduces turn-off switching loss and EMI in 100–500 kHz converters |
| CJ @ 1 MHz, 4 V | 60 pF - limits capacitive coupling noise and improves high-frequency stability |
| IFSM | 125 A - withstands inrush surges from cold-start or capacitor charging events |
| TJ max | 150°C - enables operation in sealed industrial enclosures with limited airflow |
Pinout & Package
DO-201AD axial-leaded package with cathode indicated by a band; leads are pure tin-plated per J-STD-002, RoHS and halogen-free compliant (IEC 61249-2-21), UL 94V-0 molding compound, 1.10 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., transformer secondary center-tap or switch node) |
| Cathode | Forward current exit / reverse-blocking terminal | Marked with band; connects to output rail or filter capacitor positive terminal |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast recovery (trr = 50 ns) | Reduces switching loss and ringing in high-frequency DC-DC stages operating above 100 kHz |
| Low forward voltage (VF = 1.3 V @ 3 A) | Lowers conduction loss by ~15% vs. standard FR305, improving thermal margin at full load |
| High surge rating (IFSM = 125 A) | Survives repeated cold-start surges in 24 V/48 V telecom and industrial power systems |
| DO-201AD mechanical robustness | Meets JESD201 Class 2 whisker resistance and supports automated through-hole assembly |
| AEC-Q101 qualified variant available | HER305GH meets automotive-grade reliability requirements for under-hood auxiliary supplies |
Applications
| DC-DC Converter Output Rectification | Switching Mode Inverter Freewheeling |
|---|---|
Use Scenario: Secondary-side rectification in isolated 24 V/5 A flyback converter powering industrial PLC I/O modules. IC Role / Device Role / Timing Role: High-efficiency unidirectional current path converting high-frequency AC from transformer to regulated DC output. Use Value: 50 ns trr and 1.3 V VF reduce total power loss by 0.8 W vs. standard rectifier, lowering heatsink requirement. | Use Scenario: Freewheeling path across IGBTs in 3-phase 400 VAC motor drive inverters. IC Role / Device Role / Timing Role: Provides low-loss current recirculation during IGBT turn-off to clamp inductive kickback. Use Value: 125 A IFSM handles peak regeneration currents; 60 pF CJ minimizes capacitive feedthrough into gate drive circuits. |
| Offline AC-DC Adapter | Industrial Power Supply Input Stage |
Use Scenario: Bridge rectifier leg in universal-input (90–264 VAC) 36 W adapter for PoE switches. IC Role / Device Role / Timing Role: Converts rectified AC line voltage to bulk DC before PFC stage; operates at 50/60 Hz with high surge tolerance. Use Value: 400 V VRRM satisfies 264 VAC × √2 × 1.2 = 447 V design margin with headroom for transients. | Use Scenario: Output rectifier in 48 V/10 A half-bridge LLC resonant converter for server PSUs. IC Role / Device Role / Timing Role: Synchronous rectification alternative where control complexity is prohibitive; used in fixed-frequency hard-switched secondary. Use Value: 150°C TJ max allows operation at 95°C ambient with 55°C rise, supporting compact chassis designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH3L04 | 400 V VRRM, 3 A IF, 50 ns trr, but VF = 1.45 V @ 3 A (0.15 V higher) | Slightly higher conduction loss; same DO-201AD footprint | Prefer HER305G A0G when <1.35 V VF is required for thermal budget |
| ON Semi MUR3040 | 400 V VRRM, 3 A IF, 60 ns trr, VF = 1.25 V @ 3 A, but only available in TO-220AC | Requires PCB layout change; better thermal RθJA but larger footprint | Select HER305G A0G for space-constrained through-hole designs needing 50 ns speed |
Compared with STTH3L04 and MUR3040, HER305G A0G offers the optimal balance of 50 ns recovery, 1.3 V forward drop, and DO-201AD compatibility-enabling direct replacement in legacy layouts without thermal or timing compromise.
Availability
HER305G A0G 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 lifecycle support.
Supply support for HER305G A0G 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 automotive markets since 1979.
The HER30xG series was developed specifically for high-frequency, high-reliability rectification in switching power supplies-emphasizing ultra-fast recovery, low VF, and robust surge handling in standard axial packages.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) for HER305G A0G?
The HER305G A0G has a VRRM rating of 400 V, verified per Taiwan Semiconductor's I2105 datasheet. This value is fixed for the "305" variant and applies across all packaging options including HER305G A0G. It ensures safe blocking of 280 V RMS inputs with standard design margins.
Is HER305G A0G RoHS and halogen-free compliant?
Yes, HER305G A0G is RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the official Taiwan Semiconductor datasheet (Version I2105). The DO-201AD molding compound meets UL 94V-0, and leads are pure tin-plated per J-STD-002.
What is the reverse recovery time (trr) of HER305G A0G and under what test conditions?
The HER305G A0G has a maximum reverse recovery time of 50 ns, measured at IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A per the I2105 datasheet. This ultra-fast recovery supports efficient operation in converters switching up to 500 kHz.
Does HER305G A0G have an AEC-Q101 qualified version?
Yes-the HER305GH variant is AEC-Q101 qualified and shares identical electrical specs with HER305G A0G, including 400 V VRRM, 3 A IF, and 50 ns trr. HER305G A0G itself is not AEC-Q101 certified, but HER305GH is offered in the same DO-201AD package.
What is the junction-to-lead thermal resistance (RθJL) for HER305G A0G?
The junction-to-lead thermal resistance for HER305G A0G is 10°C/W, as specified in the Thermal Performance section of the Taiwan Semiconductor I2105 datasheet. This value enables accurate thermal modeling when mounted on PCB copper pads or heatsinks via lead soldering.
HER305G A0G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 400 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 400 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
HER305G A0G FAQ
1.How can I place an order for HER305G A0G through Aetrix?
Please submit a Request for Quotation (RFQ) for HER305G A0G 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 HER305G A0G reliable?
The price and inventory of HER305G A0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER305G A0G is usually 5 days.
3.What payment methods are accepted for HER305G A0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER305G A0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HER305G A0G?
HER305G A0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HER305G A0G 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 HER305G A0G?
For technical support, including HER305G A0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER305G A0G requirements.
6.How does Aetrix verify that HER305G A0G is sourced from the original manufacturer or authorized distributors?
All HER305G A0G 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 HER305G A0G meets industry standards.
7.What is the process for return or replacement of HER305G A0G?
All HER305G A0G units undergo pre-shipment inspection (PSI). If there is an issue with HER305G A0G, 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 HER305G A0G part is unused and in its original packaging.
Return procedure for HER305G A0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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