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Taiwan Semiconductor Corporation HER204G
- Part No.:
- HER204G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
HER204G.pdf
- Description:
- DIODE GEN PURP 300V 2A DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,254
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Product details
Overview
HER204G from Taiwan Semiconductor is a high-efficiency, glass-passivated silicon rectifier diode rated for 2 A average forward current and 400 V repetitive peak reverse voltage, with 1.0 V typical forward voltage at 2 A and 25°C, used in DC-DC converters and switching-mode power supplies.
For engineers reviewing the HER204G datasheet, HER204G pinout, HER204G application, or HER204G equivalent, key selection criteria include its DO-204AC (DO-15) package, 60 A surge capability, 50 ns reverse recovery time, low junction-to-ambient thermal resistance (60°C/W), and AEC-Q101 qualification availability in variant HER204GH.
Technical Context
This device operates as a single-die, unidirectional, high-speed switching rectifier optimized for high-frequency SMPS topologies. Its 50 ns reverse recovery time and low VF support reduced conduction and switching losses in flyback and forward converters.
The DO-204AC package enables surface-mount-compatible through-hole assembly with pure tin-plated leads compliant to J-STD-002, while the glass-passivated junction ensures stable performance across -55°C to +150°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF (Avg) | 2 A - supports continuous output current in compact 25W–50W DC-DC stages |
| VRRM | 400 V - withstands peak reverse voltage in 28V/48V industrial bus-derived SMPS |
| VF @ 2A, 25°C | 1.0 V max - limits conduction loss to ≤2.0 W at full load, improving thermal margin |
| trr | 50 ns - enables operation up to ~200 kHz without excessive switching loss penalty |
| IFSM (8.3ms) | 60 A - handles inrush and transient surges in offline input rectification |
| RθJA | 60 °C/W - allows 1.2 W dissipation with ≤72°C rise above 25°C ambient on standard PCB pad |
| IR @ 400V, 25°C | 5 µA max - ensures minimal leakage in high-impedance hold-up or sensing circuits |
Pinout & Package
HER204G uses the DO-204AC (DO-15) axial-leaded package with cathode indicated by a band. Leads are pure tin-plated and solderable per J-STD-002; polarity is unambiguous and mechanically robust for automated insertion.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry node | Connected to lower-potential side (e.g., transformer secondary center-tap or switch node) |
| Cathode | Forward current exit node | Connected to output rail or filter capacitor positive; marked with band for orientation |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable long-term reliability under humidity and thermal cycling stress |
| Low VF (1.0 V typ) | Reduces I²R conduction loss by ~25% vs. standard FR-type rectifiers at 2 A |
| 50 ns trr | Minimizes reverse recovery charge (Qrr), lowering EMI and MOSFET turn-on loss in synchronous designs |
| AEC-Q101 qualified option (HER204GH) | Validated for automotive under-hood applications including body control modules and ADAS power rails |
| RoHS & halogen-free | Meets IEC 61249-2-21 and global environmental compliance requirements for industrial and consumer end equipment |
Applications
| DC-DC Converter | Switching Inverter |
|---|---|
Use Scenario: Secondary-side rectification in isolated 24V-input, 5V/3A flyback converter for industrial PLC I/O modules. IC Role / Device Role / Timing Role: High-efficiency output rectifier replacing Schottky diodes where higher VR rating is required. Use Value: 400 V VRRM and 1.0 V VF enable >89% efficiency at full load while eliminating thermal runaway risk of Schottkys. | Use Scenario: Freewheeling path in 48V battery-fed half-bridge inverter driving HVAC blower motors. IC Role / Device Role / Timing Role: Unidirectional current clamp during dead-time commutation. Use Value: 60 A IFSM safely absorbs motor back-EMF spikes; 50 ns trr prevents cross-conduction loss in 20 kHz PWM. |
| Freewheeling Diode | Offline SMPS Input Stage |
Use Scenario: Inductive load snubbing in solenoid driver circuit for automotive door latch actuation. IC Role / Device Role / Timing Role: Freewheeling path for 12V/1.5A inductive coil during PWM deactivation. Use Value: Low VF minimizes hold energy loss; DO-15 package fits constrained board space near solenoid connector. | Use Scenario: Bridge rectifier leg in universal-input (90–264 VAC) 15W AC-DC adapter for smart home sensors. IC Role / Device Role / Timing Role: High-reliability input rectifier with margin against line surges. Use Value: 400 V VRRM provides 2× safety margin over 264 VAC peak (373 V); glass passivation resists humidity-induced leakage drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH2R04 | Same IF (2 A), VRRM (400 V), but VF = 1.3 V typ; trr = 35 ns; DO-204AL (DO-41) package | Lower VF not achieved; faster trr benefits higher-frequency designs; smaller DO-41 footprint | Prefer when layout space is tighter and switching frequency exceeds 300 kHz |
| ES2D | Same IF (2 A), VRRM (200 V); VF = 0.95 V typ; trr = 35 ns; SMD SMB package | Half the VRRM rating; unsuitable for 400 V systems; surface-mount only | Choose only for 24V–48V DC-DC outputs where board area and reflow compatibility are critical |
Compared with STTH2R04 and ES2D, HER204G delivers the lowest VF among 400 V 2 A rectifiers in DO-15, offering superior thermal performance in thermally constrained through-hole layouts, while maintaining AEC-Q101-qualified variants for automotive use cases.
Availability
HER204G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and freewheeling applications requiring stable component supply, consistent parametric performance, and long-term industrial lifecycle support.
Supply support for HER204G 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 devices, and MOSFETs for industrial and automotive markets.
The HER20xG series was developed to deliver high-efficiency, high-reliability rectification in cost-sensitive yet thermally demanding power conversion stages, targeting industrial SMPS, automotive auxiliary supplies, and renewable energy interfaces.
FAQ
What is the maximum junction temperature rating for HER204G?
The HER204G has a maximum junction temperature (TJ MAX) of +150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet Version G2105. This rating applies under steady-state and transient conditions, enabling reliable operation in enclosed industrial enclosures or under-hood automotive environments when mounted on adequate copper area.
Is HER204G RoHS and halogen-free compliant?
Yes, HER204G is RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the "Features" and "Ordering Information" sections of the Taiwan Semiconductor HER201G–HER208G datasheet (Version G2105). The molding compound meets UL 94V-0, and leads are pure tin-plated without lead or brominated flame retardants.
Does HER204G have AEC-Q101 qualification?
HER204G itself is not AEC-Q101 qualified, but the variant HER204GH (ordering code with "H" suffix) is explicitly AEC-Q101 qualified per the same datasheet. HER204GH shares identical electrical specs and DO-204AC packaging, differing only in additional automotive-grade screening and traceability documentation.
What is the reverse recovery time (trr) of HER204G and how is it measured?
The HER204G has a maximum reverse recovery time (trr) of 50 ns, measured under conditions of IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A, as specified in the "Electrical Specifications" table of the Taiwan Semiconductor HER201G–HER208G datasheet. This value reflects performance at 25°C ambient and is critical for minimizing switching loss in high-frequency converters.
What package type does HER204G use and what are its mechanical features?
HER204G uses the DO-204AC (DO-15) axial-leaded package, with glass-passivated die, pure tin-plated leads compliant to J-STD-002, and cathode polarity indicated by a band. Its weight is approximately 0.400 g, and the molding compound meets UL 94V-0 flammability rating per the "Mechanical Data" section of the official datasheet.
HER204G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-204AC, DO-15, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 300 V
- Current - Average Rectified (Io):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 300 V
- Capacitance @ Vr, F:
- 35pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
- Operating Temperature - Junction:
- -55°C ~ 150°C
HER204G FAQ
1.How can I place an order for HER204G through Aetrix?
Please submit a Request for Quotation (RFQ) for HER204G 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 HER204G reliable?
The price and inventory of HER204G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER204G is usually 5 days.
3.What payment methods are accepted for HER204G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER204G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HER204G?
HER204G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HER204G 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 HER204G?
For technical support, including HER204G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER204G requirements.
6.How does Aetrix verify that HER204G is sourced from the original manufacturer or authorized distributors?
All HER204G 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 HER204G meets industry standards.
7.What is the process for return or replacement of HER204G?
All HER204G units undergo pre-shipment inspection (PSI). If there is an issue with HER204G, 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 HER204G part is unused and in its original packaging.
Return procedure for HER204G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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