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Diodes Incorporated HER301-T
- Part No.:
- HER301-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
HER301-T.pdf
- Description:
- DIODE GEN PURP 50V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:5,623
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Product details
Overview
HER301-T from Diodes Incorporated is a 3.0A, 50V high-efficiency axial-lead rectifier diode in DO-201AD package, featuring 1.1V forward voltage at 3.0A DC, 50ns reverse recovery time, and 10µA reverse leakage at 25°C - used in AC/DC input stage of offline power supplies and auxiliary rail rectification.
For engineers reviewing the HER301-T datasheet, HER301-T pinout, HER301-T application, or HER301-T equivalent, key selection criteria include peak surge current rating (125A), junction temperature range (–65°C to +150°C), low VF for thermal efficiency, and UL 94V-0 flammability compliance in industrial power adapters.
Technical Context
This high-speed silicon rectifier employs a planar epitaxial construction optimized for fast switching in single-phase, half-wave 60Hz applications with resistive or inductive loads. Its 50ns reverse recovery time and 70pF junction capacitance at 4V reverse bias support efficient operation up to ~1MHz switching frequencies in flyback snubber and output rectification circuits.
The device operates across –65°C to +150°C junction temperature and maintains 150µA max reverse current at full load and 55°C case temperature, enabling reliable performance in thermally constrained environments such as enclosed wall adapters and LED drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum non-repetitive peak reverse voltage; defines safe blocking capability in AC line transients. |
| I(AV) | 3.0 A - Average forward current at 50°C ambient with 9.5mm lead length; sets continuous power delivery limit. |
| VF @ 3.0A | 1.1 V - Forward voltage drop at rated DC current; directly determines conduction loss (3.3W) and thermal design margin. |
| TRR | 50 ns - Reverse recovery time under IF=0.5A, IR=1.0A, IRR=0.25A; critical for EMI control in high-frequency SMPS. |
| IR @ 25°C | 10 µA - Max DC reverse leakage at rated VDC; ensures low standby power in always-on circuits. |
| CJ @ 4V | 70 pF - Junction capacitance at 1 MHz and 4V reverse bias; impacts high-frequency switching losses and ringing. |
Pinout & Package
DO-201AD plastic package with axial leads; cathode indicated by color band. Total weight ≈1.2 g. Lead finish complies with MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to AC source or transformer secondary; must withstand 125A surge without bond wire failure. |
| Cathode | Forward current exit / reverse blocking terminal | Marked with color band; ties to output capacitor positive; reverse voltage applied here during off-state. |
Key Features
| Feature | Design Value |
|---|---|
| High surge current rating | 125A non-repetitive peak (8.3ms half-sine); enables robust startup and fault tolerance in unregulated inputs. |
| Low forward voltage | 1.1V at 3.0A DC reduces conduction loss by ~15% vs. standard 1N540x series, improving thermal headroom. |
| Fast reverse recovery | 50ns TRR minimizes switching loss and EMI generation in 20–100kHz flyback converters. |
| UL 94V-0 plastic case | Self-extinguishing housing meets safety standards for Class II power supplies without additional flame barriers. |
Applications
| AC/DC Wall Adapter Input Rectification | Industrial Control Auxiliary Power Supply |
|---|---|
Use Scenario: Converts 120/230VAC mains to unregulated DC in compact 5–15W isolated adapters. IC Role / Device Role / Timing Role: Primary-side rectifier in single-phase half-wave configuration; handles 50/60Hz line frequency. Use Value: 3.0A average current and 125A surge rating sustain repeated cold-start surges without degradation. | Use Scenario: Provides +12V/–12V bias rails for PLC I/O modules operating in factory environments. IC Role / Device Role / Timing Role: Secondary-side rectifier in dual-output flyback; operates at 65kHz switching frequency. Use Value: 50ns TRR and 70pF CJ reduce switching node ringing and improve regulation stability under dynamic load steps. |
| LED Driver Bulk Capacitor Charging | UPS Battery Charger Input Stage |
Use Scenario: Charges bulk electrolytic capacitor after bridge rectification in constant-current LED drivers. IC Role / Device Role / Timing Role: High-efficiency freewheeling path during MOSFET off-time in buck-derived topologies. Use Value: 1.1V VF lowers heat generation in sealed enclosures where forced cooling is unavailable. | Use Scenario: Rectifies transformer output in offline battery charger for 12V/24V lead-acid systems. IC Role / Device Role / Timing Role: Input-stage rectifier handling intermittent high-current charge pulses. Use Value: 150µA max IR at 55°C case temperature ensures minimal self-discharge during long standby periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UF3001-T | Same DO-201AD package; 50V VRRM; 50ns TRR; but lower VF (1.0V @ 3.0A) and higher IR (50µA @ 25°C). | Optimized for higher-frequency SMPS (>100kHz); slightly better efficiency but reduced blocking margin at elevated temperature. | Select UF3001-T when minimizing conduction loss is prioritized over worst-case leakage in hot environments. |
| 1N5401 | Same 50V/3.0A rating but slower TRR (2000ns), higher VF (1.2V), and no UL 94V-0 certification. | Suitable only for low-frequency linear supplies; not recommended for switch-mode designs due to excessive switching loss. | Choose 1N5401 only for cost-sensitive, non-SMPS legacy replacements where EMI and efficiency are not critical. |
Compared with HER301-T, UF3001-T offers marginally better conduction efficiency but trades off leakage stability, while 1N5401 lacks speed and safety certification - making HER301-T the balanced choice for thermally demanding, medium-frequency industrial rectification.
Availability
HER301-T is available at Aetrix Electronics and suitable for AC/DC adapter design, industrial auxiliary power supply development, and LED driver bulk charging requiring stable component supply and long-term BOM continuity.
Supply support for HER301-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection devices for industrial, computing, and consumer markets.
The HER301-T belongs to the HER30x high-efficiency rectifier family, engineered for low-loss, high-reliability AC/DC conversion in space-constrained power supplies where thermal performance and surge robustness are critical.
FAQ
Is HER301-T RoHS compliant?
Yes, HER301-T meets RoHS Directive 2011/65/EU requirements. The device uses lead-free plating on axial leads and halogen-free molding compound, verified per Diodes Incorporated's material declarations and test reports (IPC-J-STD-020 compliant).
What is the maximum allowable case temperature for continuous operation?
The maximum case temperature (TC) is 55°C for full-rated 3.0A average forward current. Derating begins above this point per Figure 1 in DS25003 Rev. 7–4; at 75°C TC, I(AV) drops to ~2.2A to maintain junction temperature ≤150°C.
Can HER301-T replace HER302-T in a 100V circuit?
No. HER301-T has 50V VRRM and is unsafe for 100V circuits. HER302-T (100V VRRM) is required. Substituting HER301-T risks catastrophic reverse breakdown during line surges or ripple peaks exceeding 50V.
Does HER301-T have a qualified AEC-Q101 rating for automotive use?
No. HER301-T is not AEC-Q101 qualified. It is specified for industrial and commercial applications only. For automotive-grade alternatives, consider Diodes Incorporated's APx30x series, which undergo full AEC-Q101 stress testing and qualification.
HER301-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 50 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
HER301-T FAQ
1.How can I place an order for HER301-T through Aetrix?
Please submit a Request for Quotation (RFQ) for HER301-T 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 HER301-T reliable?
The price and inventory of HER301-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER301-T is usually 5 days.
3.What payment methods are accepted for HER301-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER301-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HER301-T?
HER301-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HER301-T 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 HER301-T?
For technical support, including HER301-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER301-T requirements.
6.How does Aetrix verify that HER301-T is sourced from the original manufacturer or authorized distributors?
All HER301-T 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 HER301-T meets industry standards.
7.What is the process for return or replacement of HER301-T?
All HER301-T units undergo pre-shipment inspection (PSI). If there is an issue with HER301-T, 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 HER301-T part is unused and in its original packaging.
Return procedure for HER301-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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