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Diodes Incorporated HER304-T
- Part No.:
- HER304-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
HER304-T.pdf
- Description:
- DIODE GEN PURP 300V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:7,943
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Product details
Overview
HER304-T from Diodes Incorporated is a 3.0A high-efficiency axial-lead rectifier diode with 300V 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 industrial SMPS.
For engineers reviewing the HER304-T datasheet, HER304-T pinout, HER304-T application, or HER304-T equivalent, key selection criteria include VRRM derating margin, IFM surge capability under 8.3ms half-sine conditions, TJ max of +150°C, and DO-201AD package thermal performance in convection-cooled layouts.
Technical Context
This device operates as a single-phase, half-wave silicon rectifier optimized for 60Hz resistive or inductive loads. Its 50ns reverse recovery time (TRR) and 70pF junction capacitance (CJ at 4V, 1MHz) support moderate-speed switching while minimizing commutation loss and EMI generation.
The DO-201AD package enables 3.0A average forward current (I(AV)) at TA = 50°C with 9.5mm lead length, and withstands non-repetitive surge currents up to 125A (JEDEC method). Leakage remains ≤150µA at full load and TC = 55°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - Maximum repetitive reverse blocking voltage; sets minimum insulation margin for 230VAC mains input designs. |
| I(AV) | 3.0 A - Average forward current rating at 50°C ambient with 9.5mm leads; defines continuous power handling in open-frame supplies. |
| VF @ 3.0A | 1.1 V - Forward voltage drop at rated DC current; determines conduction loss (3.3W typical at full load). |
| TRR | 50 ns - Reverse recovery time under IF=0.5A, IR=1.0A, IRR=0.25A; limits switching frequency suitability and snubber sizing. |
| IFM | 125 A - Non-repetitive peak surge current (8.3ms half-sine); supports cold-start inrush without failure. |
| TJ Range | –65°C to +150°C - Operating junction temperature range; enables use in sealed industrial enclosures without active cooling. |
Pinout & Package
HER304-T uses the DO-201AD axial-leaded plastic package (UL 94V-0 rated), with cathode identified 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 (Lead 1) | Forward current entry point | Connected to AC input phase or transformer secondary; must handle full RMS current and surge transients. |
| Cathode (Lead 2, banded end) | Forward current exit / reverse blocking node | Connects to bulk capacitor positive rail; reverse leakage (≤150 µA at TC=55°C) affects standby power loss. |
Key Features
| Feature | Design Value |
|---|---|
| High surge current rating | 125A non-repetitive peak (8.3ms) - sustains repeated cold-start events in industrial AC-DC converters. |
| Low forward voltage drop | 1.1V at 3.0A - reduces conduction loss by ~15% vs. standard 1N54xx series at same current. |
| Fast reverse recovery | 50ns TRR - lowers switching loss and EMI in 20–50kHz rectifier stages compared to general-purpose diodes. |
| High-temperature operation | +150°C max junction temperature - supports compact PCB layouts with limited airflow in enclosed power modules. |
Applications
| Industrial AC-DC Power Supply | LED Driver Input Stage |
|---|---|
Use Scenario: Rectifying 230VAC mains input in DIN-rail mounted 30W–60W industrial power supplies. IC Role / Device Role / Timing Role: Primary-side unidirectional current path; blocks reverse voltage during negative AC half-cycles. Use Value: 300V VRRM provides 2.2× safety margin over 230VAC peak (325V), reducing risk of catastrophic failure under line surges. | Use Scenario: Bridge rectification in constant-current LED drivers for street lighting. IC Role / Device Role / Timing Role: High-current AC input rectifier in discrete bridge configuration. Use Value: 3.0A I(AV) and 125A IFM support sustained 2.5A LED load with 20% margin and tolerate lamp hot-plug inrush. |
| UPS Battery Charger Input | Appliance Motor Control Rectifier |
Use Scenario: Input rectification in line-interactive UPS battery charging circuits operating from 100–240VAC inputs. IC Role / Device Role / Timing Role: Half-wave rectifier feeding regulated charger IC; handles variable input voltage and backup mode transitions. Use Value: –65°C to +150°C operating range ensures reliable startup at sub-zero warehouse temperatures and sustained operation during extended backup cycles. | Use Scenario: DC bus rectification in universal motor control boards for power tools and vacuum cleaners. IC Role / Device Role / Timing Role: Main rectifier converting transformer output to DC bus for TRIAC or MOSFET driver stages. Use Value: 50ns TRR minimizes voltage spikes across motor windings during commutation, reducing audible noise and brush arcing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UF3004-T | VRRM = 300V, TRR = 50ns, VF = 1.0V @ 3.0A, I(AV) = 3.0A - faster soft recovery, lower VF | Better EMI profile in high-frequency SMPS; preferred where TRR consistency matters more than cost | Select UF3004-T when designing new products requiring long-term supply continuity and improved switching behavior. |
| ES3D-E3/57T | VRRM = 200V, TRR = 35ns, VF = 0.95V @ 3.0A, I(AV) = 3.0A - lower VRRM, faster, lower VF, SMC package | Not suitable for 230VAC input; requires PCB layout change due to surface-mount footprint | Choose ES3D-E3/57T only if redesigning for SMT assembly and operating below 170VAC RMS input. |
Compared with HER304-T, UF3004-T offers identical voltage/current ratings with superior softness and lower conduction loss, while ES3D-E3/57T trades off reverse voltage headroom for higher speed and SMT compatibility-neither is pin-compatible, and both require circuit validation.
Availability
HER304-T is available at Aetrix Electronics and suitable for industrial AC-DC power supplies, LED driver input stages, and UPS battery charger circuits requiring stable component supply and legacy design support.
Supply support for HER304-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 HER30x series belongs to Diodes' high-efficiency rectifier product line, engineered specifically for cost-sensitive, thermally constrained AC/DC front-end applications demanding reliability at elevated ambient temperatures.
FAQ
Is HER304-T suitable for use in 230VAC input power supplies?
Yes. With a 300V VRRM rating and 210V VRMS limit, HER304-T provides a 2.2× safety margin above the 325V peak of 230VAC mains, meeting standard derating requirements for Class II isolation and transient robustness in industrial power supplies.
What is the thermal resistance from junction to ambient for HER304-T?
HER304-T does not specify RθJA in its datasheet. Thermal performance depends on PCB copper area, lead length (9.5mm standard), and airflow. At TA = 50°C, it delivers 3.0A I(AV); derating curves show usable current drops to ~1.8A at TA = 75°C under natural convection.
Can HER304-T replace HER303-T or HER305-T in an existing design?
HER304-T may substitute for HER303-T (200V) if reverse voltage margin is sufficient; it cannot safely replace HER305-T (400V) in 400V-rated circuits. Forward characteristics (VF, TRR, I(AV)) are consistent across the HER301–HER305 family, enabling direct substitution within VRRM compliance limits.
Why is HER304-T marked as "Not Recommended for New Designs"?
Diodes Incorporated has discontinued HER304-T and recommends UF3004-T as its functional successor-offering identical VRRM/I(AV) ratings, lower VF (1.0V), softer recovery, and active long-term supply. HER304-T remains available for legacy repair and continuity, but no future revisions or extended lifecycle support are planned.
HER304-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):
- 300 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 @ 300 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
HER304-T FAQ
1.How can I place an order for HER304-T through Aetrix?
Please submit a Request for Quotation (RFQ) for HER304-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 HER304-T reliable?
The price and inventory of HER304-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER304-T is usually 5 days.
3.What payment methods are accepted for HER304-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER304-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HER304-T?
HER304-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HER304-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 HER304-T?
For technical support, including HER304-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER304-T requirements.
6.How does Aetrix verify that HER304-T is sourced from the original manufacturer or authorized distributors?
All HER304-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 HER304-T meets industry standards.
7.What is the process for return or replacement of HER304-T?
All HER304-T units undergo pre-shipment inspection (PSI). If there is an issue with HER304-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 HER304-T part is unused and in its original packaging.
Return procedure for HER304-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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