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Taiwan Semiconductor Corporation HER155G
- Part No.:
- HER155G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
HER155G.pdf
- Description:
- DIODE GEN PURP 400V 1.5A DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,790
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Product details
Overview
HER155G from Taiwan Semiconductor is a high-efficiency, glass-passivated silicon rectifier diode rated for 1.5A average forward current and 400V repetitive peak reverse voltage (VRRM), with low forward voltage drop (1.3V at 1.5A, 25°C) and fast reverse recovery time (50ns). It is used in DC-DC converters and switching-mode power supplies where thermal efficiency and surge robustness are critical.
For engineers reviewing the HER155G datasheet, HER155G pinout, HER155G application, or HER155G equivalent, key selection criteria include its DO-204AC (DO-15) package, AEC-Q101 qualification option (HER155GH), junction temperature limit of 150°C, and verified 50A surge capability - all essential for automotive and industrial power conversion designs.
Technical Context
The HER155G employs a single-die, planar passivated junction structure optimized for high-speed switching and low conduction loss. Its 400V VRRM rating and 50ns trr enable efficient operation in high-frequency flyback and forward converter topologies.
Thermal performance is defined by a junction-to-ambient thermal resistance of 60°C/W in standard PCB mounting, and it sustains 50A non-repetitive surge current (8.3ms half-sine) without degradation - critical for handling transient overloads in SMPS freewheeling paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Maximum reverse blocking voltage before breakdown; defines usable input voltage range in AC/DC and DC/DC stages |
| IF(AV) | 1.5 A - Continuous forward current rating at 75°C ambient; sets minimum heatsinking requirement |
| VF @ 1.5A | 1.3 V - Forward voltage drop at rated current; directly determines conduction loss (1.95W) and thermal load |
| trr | 50 ns - Reverse recovery time; enables stable operation up to ~2 MHz switching frequency with minimal switching loss |
| IFSM | 50 A - Peak non-repetitive surge current; supports inrush and fault-current handling without failure |
| TJ max | 150 °C - Maximum junction temperature; allows operation in under-hood automotive environments with proper derating |
| CJ @ 4V | 35 pF - Junction capacitance at 4V reverse bias; impacts high-frequency noise coupling and EMI filter design |
Pinout & Package
HER155G is housed in a DO-204AC (DO-15) axial-leaded package with cathode indicated by a band. Leads are pure tin-plated and solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., switch node or ground return) in freewheeling path |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; connects to output rail or inductor node requiring unidirectional current flow |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances humidity resistance and long-term reliability in harsh environments (e.g., automotive under-hood) |
| Low VF (1.3V @ 1.5A) | Reduces conduction losses by ~15% vs. standard FR15x series, improving system efficiency at full load |
| 50ns reverse recovery | Minimizes switching tail current and associated EMI in >100 kHz SMPS designs |
| AEC-Q101 qualified version available | HER155GH meets stress-test requirements for automotive power electronics (e.g., body control modules) |
| RoHS & halogen-free | Complies with IEC 61249-2-21; suitable for green manufacturing and export-regulated markets |
Applications
| DC–DC Converter | Switching Mode Inverter |
|---|---|
Use Scenario: Secondary-side rectification in isolated 12V–48V telecom DC–DC modules operating at 200–500 kHz. IC Role / Device Role / Timing Role: High-efficiency output rectifier replacing Schottky diodes where higher reverse voltage margin is required. Use Value: 400V VRRM provides 2× safety margin over 200V reflected output transients; 1.3V VF limits power loss to ≤2W at 1.5A. | Use Scenario: Freewheeling path in 3-phase motor drive inverters with 300V DC bus. IC Role / Device Role / Timing Role: Clamp diode across IGBTs to recirculate inductive energy during turn-off. Use Value: 50ns trr prevents cross-conduction during hard-switching; 50A IFSM absorbs motor stall surges. |
| Automotive Body Control Module | Industrial Power Supply |
Use Scenario: Input rectification in 12V battery-fed BCM power rails exposed to load-dump transients. IC Role / Device Role / Timing Role: Primary AC/DC or DC/DC front-end rectifier with surge resilience. Use Value: AEC-Q101-qualified HER155GH variant ensures 150°C TJ operation and whisker-resistant leads for 15-year field life. | Use Scenario: Output stage rectification in 24V/48V industrial PLC power supplies with wide ambient range (−40°C to +85°C). IC Role / Device Role / Timing Role: High-reliability, low-loss rectifier in thermally constrained enclosures. Use Value: 60°C/W RθJA enables operation at full 1.5A without heatsink below 50°C ambient; DO-15 footprint simplifies legacy board reuse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1L06S | 600V VRRM, 1.1A IF(AV), 1.15V VF @ 1.1A, 50ns trr, SOD-123FL package | Lower current rating and surface-mount format; unsuitable for through-hole legacy designs | Select when space-constrained PCB layout requires SMT and higher VRRM is needed |
| ON Semi MUR1540 | 400V VRRM, 1.5A IF(AV), 1.25V VF @ 1.5A, 60ns trr, DO-15 package, no AEC-Q101 option | Similar electrical specs but lacks automotive qualification and has slightly slower recovery | Choose for cost-sensitive industrial use where AEC-Q101 is not mandated |
Compared with STTH1L06S and MUR1540, the HER155G uniquely balances 400V/1.5A rating, 50ns speed, DO-15 compatibility, and AEC-Q101 availability - making it optimal for automotive-qualified through-hole rectification where thermal margin and surge robustness are prioritized over ultra-low VF.
Availability
HER155G is available at Aetrix Electronics and suitable for DC–DC converters, switching-mode inverters, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for HER155G 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 automotive, industrial, and consumer markets since 1979.
The HER15xG series was designed specifically for high-reliability, high-efficiency rectification in automotive-grade and industrial power conversion systems - emphasizing rugged junction passivation, surge tolerance, and extended temperature operation.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) for HER155G?
The HER155G has a VRRM rating of 400 V, as confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version I2105). This value is fixed for the HER155G variant and distinguishes it from adjacent family members like HER154G (300 V) and HER156G (600 V). Operating above 400 V risks irreversible junction breakdown.
Is HER155G RoHS and halogen-free compliant?
Yes, HER155G is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the Taiwan Semiconductor datasheet. The molding compound and lead finish meet environmental compliance requirements for export and green manufacturing without requiring special handling or exemptions.
What is the forward voltage (VF) of HER155G at 1.5A and 25°C?
The HER155G exhibits a typical forward voltage of 1.3 V at 1.5 A and 25°C junction temperature, per the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) and represents the conduction loss baseline used for thermal design and efficiency calculations in power supply applications.
Does HER155G have an AEC-Q101 qualified version?
Yes, the AEC-Q101 qualified version is designated HER155GH, as specified in the Ordering Information table. It shares identical electrical and thermal specifications with HER155G but undergoes additional stress testing per AEC-Q101 standards for automotive power electronics, including temperature cycling, highly accelerated life testing, and whisker resistance validation.
What is the reverse recovery time (trr) of HER155G and how is it tested?
The HER155G has a maximum reverse recovery time of 50 ns, measured under conditions of IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A, as defined in the Electrical Specifications table. This test condition reflects real-world switching behavior in flyback and forward converters, ensuring predictable turn-off characteristics and minimal switching loss in high-frequency designs.
HER155G 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):
- 400 V
- Current - Average Rectified (Io):
- 1.5A
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 1.5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 400 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
HER155G FAQ
1.How can I place an order for HER155G through Aetrix?
Please submit a Request for Quotation (RFQ) for HER155G 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 HER155G reliable?
The price and inventory of HER155G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER155G is usually 5 days.
3.What payment methods are accepted for HER155G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER155G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HER155G?
HER155G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HER155G 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 HER155G?
For technical support, including HER155G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER155G requirements.
6.How does Aetrix verify that HER155G is sourced from the original manufacturer or authorized distributors?
All HER155G 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 HER155G meets industry standards.
7.What is the process for return or replacement of HER155G?
All HER155G units undergo pre-shipment inspection (PSI). If there is an issue with HER155G, 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 HER155G part is unused and in its original packaging.
Return procedure for HER155G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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