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Diodes Incorporated SR304-T
- Part No.:
- SR304-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SR304-T.pdf
- Description:
- DIODE SCHOTTKY 40V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:9,977
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Product details
Overview
SR304-T from Diodes Incorporated is a high-current Schottky barrier rectifier in DO-201AD package, rated for 40 V peak repetitive reverse voltage (VRRM), 3.0 A average rectified output current at 95°C lead temperature, and 80 A non-repetitive peak forward surge current (IFSM). It delivers low forward voltage drop (0.55 V @ 3.0 A) and low thermal resistance (20 °C/W), enabling efficient power conversion in DC/DC converters and AC/DC front-end rectification.
For engineers reviewing the SR304-T datasheet, SR304-T pinout, SR304-T application, or SR304-T equivalent, key selection criteria include its axial-leaded DO-201AD mechanical form, cathode-band polarity marking, 300 pF junction capacitance at 4 V reverse bias, and derating behavior under capacitive loads per JEDEC test conditions.
Technical Context
This device operates as a unidirectional power rectifier with metal–semiconductor junction architecture, optimized for low conduction loss in high-frequency switching power supplies. Its guard ring structure enhances transient voltage immunity, while the DO-201AD package supports vertical PCB mounting with 1.27 mm lead length for validated thermal resistance of 20 °C/W.
Electrical performance is characterized at 25°C ambient unless noted, with forward voltage measured at 3.0 A DC, reverse leakage specified at both 25°C (1.0 mA) and 100°C (20 mA), and capacitance measured at 1.0 MHz and 4.0 V reverse bias - confirming suitability for 60 Hz to mid-kHz rectification tasks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum allowable repetitive reverse voltage before breakdown; defines safe blocking range in bridge or half-wave rectifiers. |
| IO (TL = 95°C) | 3.0 A - Continuous DC output current capability with leads held at 95°C; requires thermal management on PCB. |
| VF @ 3.0 A | 0.55 V - Low conduction loss reduces power dissipation and improves efficiency in high-current paths. |
| IFSM (8.3 ms) | 80 A - Surge withstand capability for line-start transients or capacitor charging spikes without failure. |
| IR @ 40 V, 25°C | 1.0 mA - Reverse leakage sets minimum off-state power loss and impacts hold-off stability in high-impedance circuits. |
| RJA | 20 °C/W - Thermal resistance from junction to ambient under defined vertical mount condition; informs heatsinking requirements. |
| CT @ 4 V, 1 MHz | 300 pF - Junction capacitance affects high-frequency switching noise and EMI filtering design near input stages. |
Pinout & Package
Package: DO-201AD molded plastic case, UL 94V-0 rated, axial leads with cathode band marking. Weight ≈1.2 g. Moisture sensitivity Level 1 per J-STD-020A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., transformer secondary center-tap or switch node) in rectifier configurations. |
| Cathode | Current exit terminal during forward conduction; marked with band | Connected to output filter capacitor or load return; polarity must be observed to prevent reverse breakdown. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | 0.55 V @ 3.0 A enables <1.7 W conduction loss, reducing thermal stress in compact power supplies. |
| High surge current rating | 80 A IFSM supports reliable operation during cold-start surges and input capacitor inrush events. |
| Guard ring protection | Integrated guard ring improves ruggedness against voltage transients and edge breakdown in high-dv/dt environments. |
| DO-201AD mechanical standard | Industry-standard axial package ensures compatibility with legacy through-hole assembly and automated taping equipment. |
Applications
| AC/DC Adapter Input Rectification | DC/DC Converter Output Rectification |
|---|---|
Use Scenario: Converts 50/60 Hz AC mains to pulsating DC prior to bulk capacitance filtering in wall adapters. IC Role / Device Role / Timing Role: Primary rectifier diode in single-phase half-wave or full-wave bridge configuration. Use Value: 0.55 V VF minimizes heat generation at 3 A load, extending adapter lifetime and meeting thermal safety limits. | Use Scenario: Freewheeling path for synchronous or non-synchronous buck converter outputs. IC Role / Device Role / Timing Role: Uncontrolled rectifier providing low-loss current return during low-side switch off-time. Use Value: 300 pF CT avoids excessive ringing at switching nodes up to ~100 kHz, easing EMI compliance. |
| Automotive Auxiliary Power Supply | Industrial Control Power Module |
Use Scenario: Rectifies alternator-derived AC in 12 V auxiliary systems subject to load dump transients. IC Role / Device Role / Timing Role: High-surge-capable rectifier handling intermittent overloads and battery-reverse protection circuits. Use Value: Guard ring structure sustains operation under ISO 7637-2 pulse 5a/b conditions without parametric shift. | Use Scenario: Provides isolated DC bus for PLC I/O modules operating in -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Mainline rectifier in wide-temperature-input power stage with minimal derating. Use Value: Stable 20 mA IR at 100°C ensures predictable leakage in long-life industrial deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB340-T | Same VRRM (40 V), identical DO-201AD package, VF = 0.55 V @ 3.0 A, but rated for 125°C junction temperature vs. 150°C for SR304-T. | Optimized for higher ambient reliability in sealed enclosures where junction temp exceeds 125°C. | Select SB340-T when extended thermal margin above 125°C is not required and supply chain prioritizes active production status. |
| SS34-E3/57T | Same electrical ratings (40 V, 3 A), but TO-277 surface-mount package; VF = 0.52 V @ 3.0 A; RJA ≈ 35 °C/W (board-level). | Suitable for space-constrained SMT designs; requires thermal pad layout for equivalent thermal performance. | Choose SS34-E3/57T for new SMT-based power supplies where board area and automated assembly outweigh through-hole serviceability. |
Compared with SB340-T and SS34-E3/57T, SR304-T offers the widest junction temperature range (-65°C to +150°C) and proven axial-lead manufacturability, making it preferable for legacy through-hole production and high-reliability thermal cycling environments despite its "not recommended for new designs" status.
Availability
SR304-T is available at Aetrix Electronics and suitable for AC/DC adapters, DC/DC converter output stages, automotive auxiliary power supplies, and industrial control power modules requiring stable component supply across extended temperature ranges and legacy manufacturing processes.
Supply support for SR304-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 SR302–SR306 series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for cost-sensitive, thermally demanding power conversion applications where low VF and robust surge handling are critical.
FAQ
What is the maximum junction temperature rating for SR304-T?
The SR304-T has an operating junction temperature range of –65°C to +150°C, verified per datasheet DS23025 Rev. 5. This allows deployment in harsh environments such as engine compartments or industrial enclosures without thermal derating below 150°C, provided lead temperature remains ≤95°C per Fig. 1 derating curve.
Is SR304-T compatible with lead-free soldering processes?
Yes - SR304-T features axial leads solderable per MIL-STD-202, Method 208, and its DO-201AD package meets UL 94V-0 flammability rating. The device supports standard lead-free reflow profiles with peak temperatures up to 260°C, provided lead temperature at 9.5 mm from body does not exceed 260°C per JEDEC J-STD-020A Level 1 moisture sensitivity.
Why is SR304-T marked 'NOT RECOMMENDED FOR NEW DESIGNS'?
This designation reflects Diodes Incorporated's strategic shift toward the SB3X0 series, which offers improved thermal performance and tighter VF distribution. SR304-T remains fully qualified and in production for legacy support, but new designs should evaluate SB340-T or SMT alternatives like SS34-E3/57T for long-term supply assurance and enhanced specs.
How does the guard ring improve transient protection in SR304-T?
The integrated guard ring in SR304-T mitigates edge breakdown by redistributing electric field concentration at the semiconductor junction periphery. This increases the device's ability to withstand fast-rising transients (e.g., ISO 7637-2 pulses) without parameter drift or catastrophic failure, particularly in automotive and industrial power inputs exposed to load dump or inductive kickback.
SR304-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 mA @ 40 V
- Capacitance @ Vr, F:
- 300pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
SR304-T FAQ
1.How can I place an order for SR304-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SR304-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 SR304-T reliable?
The price and inventory of SR304-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR304-T is usually 5 days.
3.What payment methods are accepted for SR304-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR304-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SR304-T?
SR304-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SR304-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 SR304-T?
For technical support, including SR304-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR304-T requirements.
6.How does Aetrix verify that SR304-T is sourced from the original manufacturer or authorized distributors?
All SR304-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 SR304-T meets industry standards.
7.What is the process for return or replacement of SR304-T?
All SR304-T units undergo pre-shipment inspection (PSI). If there is an issue with SR304-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 SR304-T part is unused and in its original packaging.
Return procedure for SR304-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SR304-T Tags
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Diodes Incorporated
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