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Taiwan Semiconductor Corporation HER154G
- Part No.:
- HER154G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
HER154G.pdf
- Description:
- DIODE GEN PURP 300V 1.5A DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,480
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Product details
Overview
HER154G 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 1.0V forward voltage at 1.5A and 50ns reverse recovery time-used in DC-DC converters and switching-mode power supplies.
For engineers reviewing the HER154G datasheet, HER154G pinout, HER154G application, or HER154G equivalent, key selection criteria include VRRM=400V, VF=1.0V @1.5A, trr=50ns, TJ(max)=150°C, and DO-204AC (DO-15) package compatibility with standard through-hole PCB layouts.
Technical Context
The HER154G is a single-die, planar-junction, fast-recovery rectifier optimized for high-frequency switching applications. Its 50ns reverse recovery time and 35pF junction capacitance support efficient operation in SMPS operating up to several hundred kHz.
Designed with glass passivation for enhanced reliability, it delivers low conduction loss (VF = 1.0V at IF = 1.5A, TJ = 25°C) and withstands 50A non-repetitive surge current (8.3ms half-sine), making it suitable for freewheeling and output rectification where thermal management and dynamic response are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - maximum repetitive reverse blocking voltage; defines safe operating range in flyback or boost output stages |
| IF(AV) | 1.5 A - continuous average forward current; sets thermal design baseline for heatsinking and trace width |
| VF @1.5A | 1.0 V - forward voltage drop at rated current; directly determines conduction loss (1.5W max at full load) |
| trr | 50 ns - reverse recovery time; enables stable operation in 100–500 kHz switching converters |
| TJ(max) | 150 °C - maximum junction temperature; supports operation in industrial ambient environments up to 85°C with derating |
| RθJA | 60 °C/W - junction-to-ambient thermal resistance; used to calculate required PCB copper area for thermal relief |
| CJ | 35 pF @1MHz, 4V - junction capacitance; impacts EMI filtering requirements and snubber design |
Pinout & Package
HER154G 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward current entry point | Connected to lower-potential node (e.g., switch node in buck converter or transformer secondary center-tap) |
| Cathode (banded end) | Forward current exit / reverse blocking terminal | Connected to output rail or filter capacitor; polarity must be observed to prevent catastrophic failure |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable long-term performance under humidity and thermal cycling; meets JESD201 Class 2 whisker resistance |
| Fast recovery (trr = 50 ns) | Reduces switching losses and EMI generation in high-frequency SMPS designs above 100 kHz |
| Low VF (1.0 V @1.5A) | Lowers conduction loss by ~15% vs. standard 1N4007 (1.1V), improving efficiency in 12V/24V output rails |
| RoHS & halogen-free | Complies with IEC 61249-2-21; supports environmentally compliant manufacturing and end-of-life handling |
| UL 94V-0 molding compound | Provides flame-retardant encapsulation essential for industrial and automotive-grade power supplies |
Applications
| DC-DC Converter Output Rectification | Switching Mode Inverter Freewheeling |
|---|---|
Use Scenario: Used as secondary-side rectifier in isolated 12V/24V DC-DC converters delivering up to 1.5A. IC Role / Device Role / Timing Role: Power rectifier converting high-frequency AC from transformer secondary into regulated DC output. Use Value: Low VF (1.0V) minimizes conduction loss; 50ns trr prevents cross-conduction loss during synchronous switching transitions. | Use Scenario: Placed across inductive loads (e.g., relay coils, motor windings) in 24V industrial inverters. IC Role / Device Role / Timing Role: Freewheeling diode providing low-impedance path for inductive kickback current. Use Value: 50A IFSM rating safely clamps transient energy; 400V VRRM exceeds typical bus voltage spikes in 24V systems. |
| AC-DC Adapter Secondary Side | LED Driver Constant-Current Stage |
Use Scenario: Output rectifier in compact 5–12V wall adapters powering consumer electronics. IC Role / Device Role / Timing Role: Unidirectional current path after transformer, feeding bulk capacitor and regulator stage. Use Value: DO-15 package fits standard through-hole footprints; 1.5A rating supports >15W output with margin. | Use Scenario: Used in constant-current LED driver output stage driving 1–3串联 white LEDs (9–12V total Vf). IC Role / Device Role / Timing Role: Rectifies high-frequency AC from flyback transformer to supply LED string. Use Value: 400V VRRM accommodates reflected voltage transients; 1.0V VF improves overall driver efficiency at 350mA–700mA loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1L06 | VRRM = 600V, VF = 1.15V @1.5A, trr = 55ns, DO-41 package | Higher voltage rating but larger VF and slower recovery; requires different footprint | Select when 600V blocking is needed and board space allows DO-41 layout change |
| ON Semi MUR1540 | VRRM = 400V, VF = 1.25V @1.5A, trr = 35ns, DO-41 package | Faster recovery but higher VF; not drop-in due to DO-41 vs. DO-15 lead spacing | Prefer for ultra-fast recovery-critical designs where VF penalty is acceptable and re-layout is feasible |
Compared with STTH1L06 and MUR1540, HER154G offers optimal balance of 400V rating, 1.0V VF, 50ns trr, and DO-15 compatibility-enabling direct replacement in legacy DO-15 footprints without thermal or electrical compromise.
Availability
HER154G 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 availability.
Supply support for HER154G 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 consumer markets since 1979.
The HER15xG series was designed specifically for high-efficiency, high-reliability rectification in compact, thermally constrained power supplies-emphasizing low VF, fast trr, and robust packaging for automotive-qualified and industrial-grade use.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) for HER154G?
The HER154G has a VRRM of 400 V, meaning it can reliably block up to 400 volts of reverse voltage in repetitive operation. This value is fixed per the device's marking and datasheet specification-HER154G is the fourth member of the HER151G–HER158G family, where "4" corresponds to 400V. Exceeding this rating risks avalanche breakdown or permanent damage.
Does HER154G meet AEC-Q101 qualification?
No-standard HER154G is not AEC-Q101 qualified. Only variants marked with an "H" suffix (e.g., HER154GH) are AEC-Q101 certified. The base HER154G part complies with RoHS and halogen-free standards and is rated for industrial temperature range (−55°C to +150°C), but automotive qualification requires explicit "H" ordering code.
What is the forward voltage drop of HER154G at 1.5A and 25°C?
The forward voltage (VF) of HER154G is 1.0 V maximum at IF = 1.5 A and TJ = 25°C, per the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) and represents worst-case conduction loss-actual VF decreases slightly at lower currents and increases with junction temperature.
Can HER154G replace a 1N4007 in a 24V power supply?
HER154G can replace 1N4007 only if the circuit operates below 400V reverse stress and benefits from faster recovery and lower VF. While both are DO-15 devices, 1N4007 has VRRM = 1000V but VF ≈ 1.1V and trr > 2 µs-making HER154G superior for high-frequency SMPS but unsuitable for line-frequency rectification where 1000V blocking is required. Verify reverse voltage margin before substitution.
What is the junction-to-ambient thermal resistance (RθJA) of HER154G?
The RθJA of HER154G is 60 °C/W, measured on a standard FR-4 PCB with 1-inch² copper pad per JEDEC 51-3. This value assumes no additional heatsinking; actual thermal performance improves with larger copper areas or forced airflow. For continuous 1.5A operation, ensure junction temperature stays ≤150°C using this RθJA and calculated power dissipation (P = VF × IF ≈ 1.5 W).
HER154G 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):
- 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 @ 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
HER154G FAQ
1.How can I place an order for HER154G through Aetrix?
Please submit a Request for Quotation (RFQ) for HER154G 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 HER154G reliable?
The price and inventory of HER154G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER154G is usually 5 days.
3.What payment methods are accepted for HER154G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER154G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HER154G?
HER154G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HER154G 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 HER154G?
For technical support, including HER154G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER154G requirements.
6.How does Aetrix verify that HER154G is sourced from the original manufacturer or authorized distributors?
All HER154G 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 HER154G meets industry standards.
7.What is the process for return or replacement of HER154G?
All HER154G units undergo pre-shipment inspection (PSI). If there is an issue with HER154G, 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 HER154G part is unused and in its original packaging.
Return procedure for HER154G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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