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Diodes Incorporated HER302-T
- Part No.:
- HER302-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
HER302-T.pdf
- Description:
- DIODE GEN PURP 100V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:2,582
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Product details
Overview
HER302-T from Diodes Incorporated is a 3.0A high-efficiency axial-lead rectifier diode with 100V maximum recurrent peak reverse voltage (VRRM), 1.1V forward voltage at 3.0A, and 50ns reverse recovery time - designed for AC/DC input stage rectification in offline power supplies and auxiliary power rails.
For engineers reviewing the HER302-T datasheet, HER302-T pinout, HER302-T application, or HER302-T equivalent, key selection criteria include its 125A non-repetitive surge rating, low 10µA reverse leakage at 25°C, UL 94V-0 flammability compliance, and DO-201AD package thermal performance under 50°C ambient derating.
Technical Context
This device operates as a single-phase, half-wave silicon rectifier optimized for 60Hz line-frequency applications with resistive or inductive loads. Its 50ns reverse recovery time and 70pF junction capacitance support moderate-speed switching while maintaining low conduction loss.
The DO-201AD package enables axial mounting with 9.5mm lead length, supporting 3.0A average forward current at TA = 50°C and requiring heatsinking above 55°C case temperature due to 150µA full-load reverse current at TC = 55°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 100 V - Maximum repetitive reverse voltage before breakdown; defines safe AC input voltage ceiling (e.g., ≤70V RMS). |
| I(AV) | 3.0 A - Average forward current at 50°C ambient with 9.5mm leads; sets continuous DC output capability. |
| VF @ 3.0A | 1.1 V - Forward drop at rated current; determines conduction loss (3.3W) and thermal rise in linear regulation stages. |
| TRR | 50 ns - Reverse recovery time under IF=0.5A, IR=1.0A; limits usable frequency to ≤100kHz in flyback snubbers. |
| IR @ 25°C | 10 µA - Reverse leakage at rated DC blocking voltage; ensures minimal standby power loss in high-impedance bias networks. |
| CJ @ 4V | 70 pF - Junction capacitance at 4V reverse bias; affects EMI filtering design and high-frequency noise coupling. |
Pinout & Package
DO-201AD molded plastic package with axial plated leads; cathode indicated by color band; approx. weight 1.2 g; UL 94V-0 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | AC input connection point | Accepts incoming AC waveform; must withstand peak inverse voltage and surge currents during zero-crossing transitions. |
| Cathode | DC output connection point | Delivers rectified unidirectional current; polarity marking ensures correct orientation in bridge or single-diode configurations. |
Key Features
| Feature | Design Value |
|---|---|
| High surge current rating | 125A peak for 8.3ms - sustains inrush during cold-start of capacitive-input power supplies without failure. |
| Low forward voltage drop | 1.1V at 3.0A - reduces power dissipation by ~15% vs. standard 1N540x series, easing thermal management. |
| Fast reverse recovery | 50ns - minimizes switching loss in quasi-resonant converters operating up to 100kHz. |
| Low leakage current | 10µA at 25°C - preserves battery backup integrity and prevents false triggering in high-impedance sensing circuits. |
Applications
| AC/DC Adapter Input Stage | Industrial Control Power Supply |
|---|---|
Use Scenario: Rectifying 120VAC mains input in wall-mounted adapters for consumer electronics. IC Role / Device Role / Timing Role: Primary-side unidirectional current converter enabling capacitor-input filter operation. Use Value: 3.0A rating supports 36W output designs; 100V VRRM provides 20% margin over 120VAC peak (170V). | Use Scenario: Providing isolated +24V auxiliary rail for PLC I/O modules in factory automation. IC Role / Device Role / Timing Role: Half-wave rectifier in transformer secondary winding feeding linear regulator. Use Value: 125A surge rating survives motor drive back-EMF transients; DO-201AD allows through-hole rework on legacy PCBs. |
| LED Driver Auxiliary Supply | Appliance Main Power Rectification |
Use Scenario: Generating low-power bias voltage for LED driver ICs in smart lighting fixtures. IC Role / Device Role / Timing Role: Standby rectifier powering control logic during dimming cycles. Use Value: 10µA reverse leakage extends deep-sleep battery life; 50ns TRR avoids interference with PWM dimming signals. | Use Scenario: Full-wave rectification in microwave oven high-voltage transformer secondaries. IC Role / Device Role / Timing Role: High-current path component handling intermittent 10A surges during magnetron ignition. Use Value: 125A IFM rating exceeds IEC 60335 surge requirements; UL 94V-0 housing resists arc tracking in humid environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UF3002-T | Same DO-201AD package; 100V VRRM; 50ns TRR; but VF = 1.0V @ 3.0A and IR = 5µA @ 25°C. | Lower conduction loss and leakage; preferred for energy-efficient standby supplies. | Select UF3002-T when optimizing for <10mW no-load power or extended thermal margin. |
| GBU4M | Bridge rectifier (4-pin GBU package); 600V VRRM; 4A I(AV); VF = 1.1V @ 4A; TRR = 250ns. | Provides full-wave rectification in single-package form; slower recovery limits high-frequency use. | Choose GBU4M only when replacing discrete diode bridges or requiring >100V isolation margin. |
Compared with HER302-T, UF3002-T delivers lower forward loss and leakage for efficiency-critical designs, while GBU4M trades speed for integrated full-wave functionality - neither is pin-compatible, and both require layout revision.
Availability
HER302-T is available at Aetrix Electronics and suitable for AC/DC adapter input stages, industrial control power supplies, LED driver auxiliary supplies, and appliance main power rectification requiring stable component supply despite end-of-life status.
Supply support for HER302-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 centers across Asia and manufacturing in China, Taiwan, and the U.S.
The HER30x series belongs to Diodes' high-efficiency rectifier product line, engineered specifically for cost-sensitive, thermally constrained AC/DC front-end applications where reliability under surge conditions is critical.
FAQ
Is HER302-T still in active production?
No - Diodes Incorporated has discontinued HER302-T and marked it "Not Recommended for New Designs." It remains available through authorized distributors with remaining legacy stock, and Aetrix Electronics maintains traceable inventory with full lot documentation for ongoing production support.
What is the maximum allowable case temperature for continuous operation?
The datasheet specifies 150µA full-cycle average reverse current at TC = 55°C, indicating that sustained operation above 55°C case temperature requires derating. Thermal design must ensure TC ≤ 55°C for rated 3.0A I(AV), typically achieved using ≥1.5 cm² copper pour on FR-4 PCB.
Can HER302-T replace HER301-T in a 50V design?
Yes - HER302-T has identical package, pinout, and thermal characteristics as HER301-T, with higher VRRM (100V vs. 50V). Substitution is electrically safe and improves voltage margin, though forward voltage and recovery time are unchanged, so dynamic behavior remains consistent.
Does HER302-T meet RoHS and REACH requirements?
Yes - HER302-T complies with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, as confirmed in Diodes Incorporated's official material declarations. Lead-free solderability is validated per MIL-STD-202, Method 208, and the device carries the "Pb-Free" marking on packaging.
HER302-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):
- 100 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 @ 100 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
HER302-T FAQ
1.How can I place an order for HER302-T through Aetrix?
Please submit a Request for Quotation (RFQ) for HER302-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 HER302-T reliable?
The price and inventory of HER302-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER302-T is usually 5 days.
3.What payment methods are accepted for HER302-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER302-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HER302-T?
HER302-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HER302-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 HER302-T?
For technical support, including HER302-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER302-T requirements.
6.How does Aetrix verify that HER302-T is sourced from the original manufacturer or authorized distributors?
All HER302-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 HER302-T meets industry standards.
7.What is the process for return or replacement of HER302-T?
All HER302-T units undergo pre-shipment inspection (PSI). If there is an issue with HER302-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 HER302-T part is unused and in its original packaging.
Return procedure for HER302-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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