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Diodes Incorporated HER303-T
- Part No.:
- HER303-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
HER303-T.pdf
- Description:
- DIODE GEN PURP 200V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:2,400
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Product details
Overview
HER303-T from Diodes Incorporated is a 3.0A high-efficiency axial-lead rectifier diode with 200V maximum recurrent peak reverse voltage (VRRM), 1.1V forward voltage drop at 3.0A DC, and 50ns reverse recovery time-designed for AC/DC input stage rectification in offline power supplies and industrial SMPS.
For engineers reviewing the HER303-T datasheet, HER303-T pinout, HER303-T application, or HER303-T equivalent, key selection criteria include its 125A non-repetitive surge rating, low 10µA reverse leakage at 25°C, DO-201AD package thermal performance, and compatibility with 60Hz half-wave resistive/inductive loads.
Technical Context
This device operates as a single-phase, half-wave silicon rectifier optimized for high-speed switching and low conduction loss. Its 50ns reverse recovery time (TRR) and 70pF junction capacitance at 4V reverse bias support efficient operation in 20–100kHz switch-mode power conversion stages.
The DO-201AD package provides mechanical robustness with solderable axial leads compliant to MIL-STD-202 Method 208, enabling reliable through-hole mounting in high-vibration environments. Thermal derating begins at 50°C ambient, maintaining 3.0A average forward current up to that point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 200 V - Maximum repetitive reverse voltage the diode blocks without breakdown in AC line applications. |
| I(AV) | 3.0 A - Average forward rectified current at 50°C ambient with 9.5mm lead length, defining continuous power handling. |
| VF @ 3.0A | 1.1 V - Forward voltage drop determining conduction loss and thermal rise in rectifier bridges or input stages. |
| TRR | 50 ns - Reverse recovery time affecting switching losses and EMI in high-frequency SMPS designs. |
| IR @ 25°C | 10 µA - DC reverse leakage current at rated blocking voltage, critical for low-power standby efficiency. |
| CJ @ 4V | 70 pF - Junction capacitance influencing high-frequency impedance and snubber design in flyback converters. |
Pinout & Package
HER303-T uses the DO-201AD axial-lead plastic package with cathode indicated by a color band on the body. Leads are plated for solderability per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward current entry node | Connected to AC source or transformer secondary during positive half-cycle conduction. |
| Cathode (banded end) | Forward current exit node | Routes rectified DC to bulk capacitor or downstream converter; polarity marking prevents reverse installation. |
Key Features
| Feature | Design Value |
|---|---|
| High surge current rating | 125A peak (8.3ms half-sine) enables robust startup and fault tolerance in unregulated AC inputs. |
| Low forward voltage drop | 1.1V at 3.0A reduces conduction loss by ~15% vs. standard 1N540x series, improving thermal margin. |
| Fast reverse recovery | 50ns TRR minimizes switching loss and ringing in 50–100kHz flyback and forward converters. |
| UL 94V-0 flammability | Plastic encapsulation meets safety standards for enclosed industrial power supply housings. |
Applications
| AC/DC Adapter Input Rectification | Industrial SMPS Front-End |
|---|---|
Use Scenario: 100–240VAC input stage of wall-mounted adapters for consumer electronics. IC Role / Device Role / Timing Role: High-efficiency half-wave rectifier converting AC line to pulsating DC prior to bulk capacitance. Use Value: 1.1V VF and 3.0A I(AV) enable compact heatsink-free designs up to 36W output. | Use Scenario: Input rectification in 100–500W industrial switch-mode power supplies. IC Role / Device Role / Timing Role: Primary-side rectifier handling 60Hz line frequency with high surge immunity. Use Value: 125A IFM rating withstands inrush currents from large input capacitors and cold-start conditions. |
| UPS Battery Charger Stage | Motor Drive Auxiliary Power Supply |
Use Scenario: AC-to-DC conversion feeding battery charging circuitry in line-interactive UPS systems. IC Role / Device Role / Timing Role: Unidirectional current path isolating AC input from DC bus during battery backup mode. Use Value: 10µA IR at 25°C ensures minimal standby drain when AC is absent and system runs on battery. | Use Scenario: Auxiliary 24V DC supply generation from mains for gate drivers and control logic in 3-phase inverters. IC Role / Device Role / Timing Role: Isolated rectifier in transformer-coupled auxiliary winding circuit. Use Value: 50ns TRR suppresses voltage spikes induced by fast-switching IGBT gate drive transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UF3003-T | 200V VRRM, 50ns TRR, but lower VF (0.95V @ 3.0A); DO-201AD package. | Higher efficiency in continuous conduction mode; preferred where thermal headroom is constrained. | Select UF3003-T for new designs requiring lower conduction loss and faster soft recovery. |
| HER203G | 200V VRRM, 3.0A I(AV), but slower TRR (75ns); TO-220AC package with tab heat sinking. | Higher thermal dissipation capability; suited for forced-air-cooled 500W+ systems. | Choose HER203G when board-level airflow or heatsinking supports higher power density. |
Compared with HER303-T, UF3003-T offers lower forward loss and improved EMI behavior due to softer recovery, while HER203G trades speed for superior thermal management in high-power chassis-mounted supplies.
Availability
HER303-T is available at Aetrix Electronics and suitable for AC/DC adapter input rectification, industrial SMPS front-end designs, and UPS battery charger stages requiring stable component supply and legacy design continuity.
Supply support for HER303-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The HER301–HER305 series targets cost-sensitive, high-volume power conversion applications where efficiency, surge robustness, and axial-lead reliability are prioritized over ultra-fast recovery or surface-mount integration.
FAQ
Is HER303-T RoHS compliant?
Yes, HER303-T is RoHS compliant and lead-free per Diodes Incorporated's product change notice PCN-2018-001. The device meets EU Directive 2011/65/EU requirements, including exemption 7a for lead in high-melting-temperature type solders used in axial-lead termination plating.
What is the maximum operating temperature for HER303-T?
The HER303-T has a junction temperature range of –65°C to +150°C and storage temperature range matching. Continuous operation at full 3.0A load requires ambient ≤50°C with 9.5mm lead length; derating to 1.5A occurs at 100°C ambient per Figure 1 in DS25003 Rev. 7.
Can HER303-T replace 1N5403 in existing designs?
Yes-HER303-T is a direct functional upgrade to 1N5403: same DO-201AD package, 200V VRRM, and 3.0A I(AV), but with 50ns TRR (vs. 2000ns), 1.1V VF (vs. 1.2V), and 125A IFM (vs. 200A). No layout changes needed; improves efficiency and EMI.
Why is HER303-T marked "Not Recommended for New Designs"?
Diodes Incorporated discontinued HER303-T for new designs per DS25003 Rev. 7, recommending UF3003-T instead due to its lower VF (0.95V), softer recovery, and enhanced reliability. HER303-T remains supported for legacy repair and production continuity with no announced last-time-buy date.
HER303-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):
- 200 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 @ 200 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
HER303-T FAQ
1.How can I place an order for HER303-T through Aetrix?
Please submit a Request for Quotation (RFQ) for HER303-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 HER303-T reliable?
The price and inventory of HER303-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER303-T is usually 5 days.
3.What payment methods are accepted for HER303-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER303-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HER303-T?
HER303-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HER303-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 HER303-T?
For technical support, including HER303-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER303-T requirements.
6.How does Aetrix verify that HER303-T is sourced from the original manufacturer or authorized distributors?
All HER303-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 HER303-T meets industry standards.
7.What is the process for return or replacement of HER303-T?
All HER303-T units undergo pre-shipment inspection (PSI). If there is an issue with HER303-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 HER303-T part is unused and in its original packaging.
Return procedure for HER303-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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