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Taiwan Semiconductor Corporation HER157G-K
- Part No.:
- HER157G-K
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
HER157G-K.pdf
- Description:
- 75NS, 1.5A, 800V, HIGH EFFICIENT
- Quantity:
- Payment:
- Shipping:
Inventory:9,057
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Product details
Overview
HER157G-K from Taiwan Semiconductor is a high-efficiency, glass-passivated silicon rectifier diode rated for 1.5 A average forward current and 800 V repetitive peak reverse voltage in a DO-204AC (DO-15) package. It delivers low forward voltage (1.7 V max at 1.5 A, 25°C), fast reverse recovery (75 ns), and high surge capability (50 A, 8.3 ms), making it suitable for switching-mode power supplies and DC-DC converters.
For engineers reviewing the HER157G-K datasheet, HER157G-K pinout, HER157G-K application, or HER157G-K equivalent, key selection criteria include its 800 V VRRM, 75 ns trr, 1.7 V VF max, DO-15 mechanical compatibility, and RoHS/halogen-free compliance for industrial and energy-efficient power conversion designs.
Technical Context
The HER157G-K is a single-die, standard recovery rectifier optimized for high-frequency switching applications where low conduction loss and controlled reverse recovery are critical. Its 75 ns reverse recovery time and 20 pF junction capacitance support operation in SMPS operating up to several hundred kHz.
Thermally, it features a junction-to-ambient thermal resistance of 60 °C/W and operates across –55°C to +150°C junction temperature range. The device uses pure tin-plated leads compliant with J-STD-002 and passes JESD 201 Class 1A whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - Maximum non-repetitive reverse blocking voltage; defines safe operating ceiling in flyback or boost topologies |
| IF | 1.5 A - Continuous average forward current rating at 75°C ambient; determines heatsink sizing in linear derating |
| trr | 75 ns - Measured under IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A; enables efficient operation in 100–500 kHz SMPS |
| VF | 1.7 V max at 1.5 A, 25°C - Directly impacts conduction loss and thermal load in high-duty-cycle rectification |
| IFSM | 50 A - Peak non-repetitive surge current (8.3 ms half-sine); supports cold-start and transient overload resilience |
| RθJA | 60 °C/W - Junction-to-ambient thermal resistance; used to calculate temperature rise without heatsink |
| CJ | 20 pF at 1 MHz, 4 V - Affects high-frequency switching noise and snubber design in resonant circuits |
Pinout & Package
Package: DO-204AC (DO-15), axial leaded, glass-passivated, cathode indicated by band. Weight: 0.400 g. Molding compound meets UL 94V-0.
| 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 return) |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; connects to output rail or filter capacitor positive; blocks 800 V reverse |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable long-term reliability and moisture resistance without hermetic sealing |
| Low VF (1.7 V max) | Reduces conduction losses by ~15% vs. legacy 1N4007 in same 1.5 A application |
| 75 ns trr | Minimizes switching loss and EMI generation compared to general-purpose rectifiers (>200 ns) |
| RoHS & halogen-free | Complies with IEC 61249-2-21; supports green manufacturing and end-of-life recycling requirements |
| 50 A IFSM | Withstands inrush currents during power-up without degradation in typical 12–48 V input converters |
Applications
| Switching Mode Power Supply (SMPS) | DC-DC Converter Output Rectification |
|---|---|
Use Scenario: Used as primary output rectifier in isolated flyback or forward converters delivering 5–24 V at ≤1.5 A. IC Role / Device Role / Timing Role: High-voltage, medium-current unidirectional current valve converting transformer AC to regulated DC. Use Value: 75 ns trr and 1.7 V VF reduce switching loss and thermal stress versus slower, higher-VF alternatives. | Use Scenario: Rectifies secondary-side output in non-isolated buck-derived converters with 800 V input stage clamping. IC Role / Device Role / Timing Role: Freewheeling diode providing current path during high-side switch off-time. Use Value: 50 A IFSM handles transient overloads; DO-15 footprint allows direct replacement in legacy layouts. |
| Industrial Inverter DC Bus Clamp | Freewheeling Diode in Relay/Contactor Snubbers |
Use Scenario: Clamps inductive kickback in motor drive DC bus protection circuits. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting bus overvoltage during regeneration or fault events. Use Value: 800 V VRRM provides margin above 600 V nominal bus; 60 °C/W RθJA enables natural-convection mounting. | Use Scenario: Absorbs back-EMF when de-energizing solenoids, relays, or contactors in PLC I/O modules. IC Role / Device Role / Timing Role: Passive freewheeling element routing inductive energy into dissipation path. Use Value: Glass passivation ensures long-term stability under repeated surge stress; 0.4 g weight suits compact PCB mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1L5R0DJF | 1.5 A, 600 V VRRM, 50 ns trr, TO-220AC package | Lower voltage rating; requires redesign if >600 V blocking needed | Preferred where faster recovery and heatsink-mounting are prioritized over voltage headroom |
| ON Semi MUR1580CT | 1.5 A, 800 V, dual common-cathode configuration, TO-220AB | Not single-diode; requires layout change and may increase board area | Only suitable when dual-output or synchronous rectification topology demands paired devices |
Compared with STTH1L5R0DJF and MUR1580CT, the HER157G-K offers optimal balance of 800 V blocking, DO-15 footprint compatibility, and 75 ns recovery-making it ideal for space-constrained, cost-sensitive SMPS where voltage margin and axial lead assembly are essential.
Availability
HER157G-K is available at Aetrix Electronics and suitable for switching mode power supplies, DC-DC converters, and industrial inverters requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for HER157G-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, serving global power, automotive, and industrial markets since 1979.
The HER series high-efficiency rectifiers are designed specifically for high-frequency, high-reliability power conversion-emphasizing low VF, fast trr, and robust thermal performance in standard axial packages.
FAQ
What is the maximum junction temperature rating for HER157G-K?
The HER157G-K has a maximum junction temperature (TJ) rating of +150°C, with an operational range from –55°C to +150°C. This rating is specified in the Absolute Maximum Ratings table and validated under steady-state thermal conditions. Derating curves in the datasheet define allowable IF reduction above 75°C ambient. Thermal design must account for RθJA = 60 °C/W when no heatsink is used.
Is HER157G-K suitable as a direct replacement for 1N4007 in high-frequency applications?
No-while both are DO-15 rectifiers, the HER157G-K is not a drop-in replacement for 1N4007 in high-frequency use. The 1N4007 has >2 µs reverse recovery and 1.1 A rating, whereas HER157G-K offers 75 ns trr and 1.5 A IF. Substituting HER157G-K improves efficiency in SMPS but requires verifying layout clearance, thermal margin, and voltage derating per application.
What does the 'G' suffix in HER157G-K signify?
The 'G' in HER157G-K indicates green molding compound compliant with RoHS and halogen-free standards per IEC 61249-2-21. It is part of Taiwan Semiconductor's standardized marking code: HER157G-K = device marking "HER157G", green compound, tape-and-reel packaging (K). The 'K' denotes 3,500 units per reel.
Does HER157G-K have a specified reverse recovery charge (Qrr) value?
No-Qrr is not published in the official HER157G-K datasheet (Version B2105). Only trr = 75 ns is specified under defined test conditions (IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A). Designers requiring Qrr should consult TSC application notes or characterize using standard double-pulse test setups.
Can HER157G-K be used in surface-mount designs?
No-HER157G-K is exclusively offered in the through-hole DO-204AC (DO-15) axial package. It lacks SMD variants such as SMB or SMC. For surface-mount equivalents, consider Taiwan Semiconductor's HER157S (SMB) or alternative vendors' 800 V SMD rectifiers-but note that pinout, thermal path, and surge ratings differ significantly from HER157G-K.
HER157G-K 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):
- 800 V
- Current - Average Rectified (Io):
- 1.5A
- Voltage - Forward (Vf) (Max) @ If:
- 1.7 V @ 1.5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 75 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 800 V
- Capacitance @ Vr, F:
- 20pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
- Operating Temperature - Junction:
- -55°C ~ 150°C
HER157G-K FAQ
1.How can I place an order for HER157G-K through Aetrix?
Please submit a Request for Quotation (RFQ) for HER157G-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 HER157G-K reliable?
The price and inventory of HER157G-K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER157G-K is usually 5 days.
3.What payment methods are accepted for HER157G-K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER157G-K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HER157G-K?
HER157G-K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HER157G-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 HER157G-K?
For technical support, including HER157G-K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER157G-K requirements.
6.How does Aetrix verify that HER157G-K is sourced from the original manufacturer or authorized distributors?
All HER157G-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 HER157G-K meets industry standards.
7.What is the process for return or replacement of HER157G-K?
All HER157G-K units undergo pre-shipment inspection (PSI). If there is an issue with HER157G-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 HER157G-K part is unused and in its original packaging.
Return procedure for HER157G-K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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