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Diodes Incorporated SR503-T
- Part No.:
- SR503-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SR503-T.pdf
- Description:
- DIODE SCHOTTKY 30V 5A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:9,255
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Product details
Overview
SR503-T from Diodes Incorporated is a high-current Schottky barrier rectifier in DO-201AD package, rated for 30 V repetitive peak reverse voltage, 5.0 A average forward current at 90°C, and 150 A non-repetitive surge current. It delivers low forward voltage drop (0.67 V @ 5.0 A), low thermal resistance (10 K/W), and junction capacitance of 400 pF, enabling efficient power conversion in DC/DC converters and AC/DC front-end rectification.
For engineers reviewing the SR503-T datasheet, SR503-T pinout, SR503-T application, or SR503-T equivalent, key selection criteria include its 30 V blocking rating, 5.0 A thermal current limit, axial-leaded DO-201AD mechanical form factor, and cathode-band polarity marking-critical for high-efficiency, high-surge industrial power supplies and automotive auxiliary power modules.
Technical Context
This Schottky rectifier uses a guard-ringed silicon die to enhance transient voltage immunity and reduce leakage under high-temperature reverse bias. Its low VF and low RθJL enable minimal conduction and thermal losses in continuous-duty switching power applications.
Designed for single-phase, half-wave, 60 Hz operation with resistive or inductive loads, it supports vertical PCB mounting with 9.5 mm lead length and meets UL 94V-0 flammability requirements. Junction capacitance is characterized at 1.0 MHz and 4.0 V reverse bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 30 V - Maximum repetitive peak reverse voltage; defines safe DC/AC blocking capability in rectifier stage |
| I(AV) | 5.0 A @ TL = 90°C - Continuous forward current rating with 9.5 mm lead length; sets thermal design margin for heatsinkless operation |
| IFSM | 150 A - Peak surge current for 8.3 ms half-sine wave; determines robustness against line transients and inrush events |
| VF | 0.67 V @ 5.0 A - Forward voltage drop at rated DC current; directly impacts conduction loss and efficiency in 12–24 V systems |
| RθJL | 10 K/W - Thermal resistance from junction to lead; enables direct lead-to-PCB heat path without additional heatsinking |
| CJ | 400 pF @ 4.0 V, 1.0 MHz - Junction capacitance; affects high-frequency switching noise and EMI filter sizing |
Pinout & Package
Package: DO-201AD molded plastic case with axial leads, cathode band marking, UL 94V-0 rated material, and 1.20 g mass. Mounting position is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input source (e.g., transformer secondary or switching node); must withstand full surge current |
| Cathode | Forward current exit point | Connected to output rail or smoothing capacitor; marked by band; carries full load current and ripple |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Improves transient voltage immunity and reduces IR drift under high dV/dt stress |
| Low forward voltage drop | 0.67 V @ 5.0 A minimizes power loss in 12–24 V DC/DC stages and improves system efficiency |
| High surge capacity | 150 A IFSM supports reliable operation during cold-start, motor startup, and lightning-induced surges |
| UL 94V-0 plastic case | Ensures flame-retardant enclosure compliance for industrial and transportation end equipment |
Applications
| AC/DC Adapter Front-End | Automotive Auxiliary Power Supply |
|---|---|
Use Scenario: Rectifying 12–24 VAC transformer output in wall adapters and open-frame power supplies. IC Role / Device Role / Timing Role: Primary unidirectional power switch converting AC to pulsating DC before filtering and regulation. Use Value: 0.67 V VF and 5.0 A rating enable compact, thermally efficient designs without forced air cooling. | Use Scenario: Converting alternator output or battery-charger output in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Input rectifier in dual-battery isolators and USB-C PD auxiliary rails. Use Value: 150 A surge rating handles alternator load dump transients; DO-201AD axial leads simplify through-hole assembly on engine bay PCBs. |
| Industrial DC/DC Converter Input Stage | LED Driver Bulk Rectification |
Use Scenario: High-reliability rectification in 24–48 V input isolated DC/DC modules for PLCs and HMIs. IC Role / Device Role / Timing Role: Main AC or HV DC input rectifier feeding bulk capacitor and primary-side controller. Use Value: 10 K/W RθJL allows direct lead-to-copper pour thermal transfer, reducing need for thermal vias or external heatsinks. | Use Scenario: Off-line LED driver input stage converting rectified 100–277 VAC to high-voltage DC bus. IC Role / Device Role / Timing Role: Bulk rectifier in constant-current LED drivers for street lighting and commercial fixtures. Use Value: 30 V VRRM supports use in lower-voltage auxiliary rails (e.g., control logic supply) derived from main rectified bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB530-T | Same DO-201AD package, 30 V VRRM, but lower VF (0.55 V @ 5 A) and higher IFSM (200 A) | Better suited for high-efficiency, high-surge environments like solar charge controllers | Select SB530-T when lower conduction loss and enhanced surge margin are required; note tighter VF tolerance |
| SS53-T | DO-214AC (SMA) package, 30 V VRRM, 5 A rating, VF = 0.55 V @ 5 A, surface-mount only | Enables automated SMT assembly but requires PCB layout revision and lacks axial-lead mechanical robustness | Choose SS53-T for space-constrained, high-volume production where reflow compatibility is mandatory |
Compared with SR503-T, SB530-T offers superior surge handling and lower conduction loss in identical through-hole packaging, while SS53-T trades mechanical ruggedness for SMT scalability-making SR503-T optimal for cost-sensitive, serviceable, or vibration-prone through-hole power supplies.
Availability
SR503-T is available at Aetrix Electronics and suitable for AC/DC adapters, automotive auxiliary power supplies, industrial DC/DC converters, and LED driver bulk rectification requiring stable component supply and long-term manufacturability.
Supply support for SR503-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 SR503-T belongs to the SR50x high-current Schottky rectifier product line, engineered for high-efficiency, high-surge-capability AC/DC and DC/DC power conversion in cost-sensitive, thermally constrained applications.
FAQ
What is the maximum operating temperature for SR503-T?
The SR503-T has a storage and operating junction temperature range of –65°C to +150°C. Its 5.0 A average forward current rating is specified at 90°C lead temperature, and thermal resistance is measured with 9.5 mm vertical lead length on PCB-designers must ensure lead-to-ambient thermal path sustains this condition under full load.
Is SR503-T RoHS compliant and halogen-free?
Yes, SR503-T is RoHS compliant and halogen-free per Diodes Incorporated's standard product specifications. The DO-201AD package uses UL 94V-0 rated molding compound, and all materials meet JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for through-hole assembly processes.
Can SR503-T replace SR502-T in an existing design?
Yes, SR503-T is a direct upgrade from SR502-T: both share DO-201AD package, axial leads, and cathode band polarity, but SR503-T offers higher 30 V VRRM (vs. 20 V) and identical 5.0 A/150 A ratings. No layout change is needed, though designers should verify reverse voltage margin in the circuit exceeds 30 V.
Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?
The notice refers to Diodes Incorporated's recommendation to adopt the newer SB5xx series (e.g., SB530) for new designs due to improved VF, IFSM, and process maturity. SR503-T remains fully qualified, in active production, and supported with full datasheet, reliability data, and long-term supply assurance for legacy and maintenance programs.
SR503-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):
- 30 V
- Current - Average Rectified (Io):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 mA @ 30 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
SR503-T FAQ
1.How can I place an order for SR503-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SR503-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 SR503-T reliable?
The price and inventory of SR503-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR503-T is usually 5 days.
3.What payment methods are accepted for SR503-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR503-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SR503-T?
SR503-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SR503-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 SR503-T?
For technical support, including SR503-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR503-T requirements.
6.How does Aetrix verify that SR503-T is sourced from the original manufacturer or authorized distributors?
All SR503-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 SR503-T meets industry standards.
7.What is the process for return or replacement of SR503-T?
All SR503-T units undergo pre-shipment inspection (PSI). If there is an issue with SR503-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 SR503-T part is unused and in its original packaging.
Return procedure for SR503-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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