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Diodes Incorporated SR502-T-F
- Part No.:
- SR502-T-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SR502-T-F.pdf
- Description:
- DIODE SCHOTTKY 20V 5A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:9,786
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Product details
Overview
SR502-T-F from Diodes Incorporated is a high-current Schottky barrier rectifier in DO-201AD package, rated for 20 V repetitive peak reverse voltage, 5.0 A average forward current at 90°C lead temperature, and 150 A non-repetitive surge current (8.3 ms half-sine). It delivers low forward voltage drop (0.55 V @ 5.0 A), low thermal resistance (15 K/W junction-to-lead), and integrated guard ring for transient protection - used in DC-DC converter output stages and AC/DC secondary-side rectification.
For engineers reviewing the SR502-T-F datasheet, SR502-T-F pinout, SR502-T-F application, or SR502-T-F equivalent, key selection criteria include forward voltage vs. thermal derating, surge robustness under line transients, junction capacitance impact on switching noise, and DO-201AD axial-lead mechanical compatibility with through-hole PCB layouts.
Technical Context
This device operates as a unidirectional power rectifier with metal-semiconductor junction architecture, enabling majority-carrier conduction and eliminating minority-carrier storage delay. Its guard ring structure provides edge termination to suppress avalanche breakdown during voltage transients.
Thermal performance is defined for vertical PC board mounting with 9.5 mm lead length; junction capacitance (550 pF @ 4.0 V, 1.0 MHz) reflects its trade-off between low VF and higher displacement current in high-frequency applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum repetitive reverse voltage before breakdown; sets upper limit for secondary-side flyback or buck output voltage rating. |
| I(AV) | 5.0 A @ TL = 90°C - Continuous DC output current capability with 9.5 mm lead heatsinking; defines minimum trace width and copper area requirements. |
| VF | 0.55 V @ 5.0 A - Low conduction loss directly reduces power dissipation (2.75 W typical) and improves system efficiency in 5–12 V output rails. |
| IFSM | 150 A (8.3 ms half-sine) - Withstands inrush and short-circuit surge events without failure; critical for hot-plug and load-dump immunity. |
| RθJL | 15 K/W - Junction-to-lead thermal resistance enables direct lead soldering as primary heat path; requires mechanical support for sustained 5 A operation. |
| CJ | 550 pF @ 4.0 V, 1.0 MHz - Limits high-frequency noise coupling and affects EMI filter design in SMPS outputs above 100 kHz. |
Pinout & Package
Package: DO-201AD molded plastic case with axial leads; cathode identified by band; UL 94V-0 flammability rating; weight ≈ 1.20 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Current entry point under forward bias | Connected to transformer secondary or switch-node side; must handle full load current and surge without voltage overshoot. |
| Cathode (Lead 2, banded) | Current exit point under forward bias | Connected to output capacitor and load; polarity-sensitive placement prevents reverse conduction and latch-up in synchronous designs. |
Key Features
| Feature | Design Value |
|---|---|
| High surge capacity (150 A) | Enables reliable operation during cold-start, output short, or input line dip without bond-wire fusing. |
| Low forward voltage (0.55 V) | Reduces conduction loss by >30% vs. standard PN rectifiers at 5 A, lowering thermal stress on adjacent components. |
| Guard ring protection | Suppresses edge breakdown under fast dv/dt transients, improving reliability in noisy industrial power supplies. |
| DO-201AD axial package | Supports manual or wave soldering with standardized 9.5 mm lead length; compatible with legacy through-hole assembly lines. |
Applications
| AC/DC Adapter Output Rectification | DC-DC Converter Secondary Side |
|---|---|
Use Scenario: 12 V/3 A wall adapter powering IoT gateways with variable load profiles and ambient temperatures up to 60°C. IC Role / Device Role / Timing Role: Primary unidirectional power transfer element converting transformer AC to regulated DC; no timing function. Use Value: 0.55 V forward drop minimizes heat generation in confined enclosures, while 150 A surge rating absorbs inrush from bulk capacitors. | Use Scenario: 5 V output stage of an isolated flyback converter in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Output rectifier conducting only during transformer reset phase; operates at 60–100 kHz switching frequency. Use Value: 550 pF junction capacitance limits high-frequency ringing, reducing need for snubbers and easing EMI compliance. |
| Automotive Accessory Power Supply | LED Driver Constant-Current Stage |
Use Scenario: 24 V input to 5 V/2 A supply in vehicle infotainment USB ports exposed to load dump pulses. IC Role / Device Role / Timing Role: Input-side rectifier handling alternator ripple and transient overvoltage events. Use Value: Guard ring structure withstands 120 V/50 ms load dump surges per ISO 7637-2 without degradation. | Use Scenario: Constant-current LED string driver in outdoor signage operating at 350 mA continuous with 100% duty cycle. IC Role / Device Role / Timing Role: Freewheeling diode in buck-derived constant-current topology; conducts during MOSFET off-time. Use Value: 15 K/W thermal resistance allows direct lead-mounting to chassis ground plane, maintaining <125°C junction temp at full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB520-T | Same VRRM (20 V), lower I(AV) (2.0 A), lower VF (0.52 V), DO-201AD package | Rated for lower continuous current; suitable only for ≤2 A output rails | Select SB520-T when thermal budget is tighter but load current is ≤2 A; avoid for 5 A designs. |
| SS52-T | Higher VRRM (20 V), same I(AV) (5.0 A), higher VF (0.75 V), SMA package (surface-mount) | Requires rework of PCB layout; lacks axial lead thermal path | Choose SS52-T only if space-constrained SMT assembly is mandatory and thermal vias can replace lead conduction. |
Compared with SB520-T and SS52-T, SR502-T-F uniquely balances 5 A current handling, axial-lead thermal management, and 20 V blocking in a legacy-compatible DO-201AD form factor - making it optimal for cost-sensitive, thermally demanding through-hole power supplies where redesign is not feasible.
Availability
SR502-T-F is available at Aetrix Electronics and suitable for AC/DC adapters, industrial DC-DC converters, and automotive accessory power supplies requiring stable component supply and long-term manufacturability.
Supply support for SR502-T-F 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 SR series targets high-efficiency, high-reliability power conversion in cost-sensitive industrial and consumer applications - emphasizing surge robustness, low conduction loss, and mechanical compatibility with legacy assembly processes.
FAQ
Is SR502-T-F suitable for synchronous rectification?
No. SR502-T-F is a passive Schottky rectifier and lacks gate control or logic interface required for synchronous rectification. It functions only as a diode with fixed forward/reverse behavior. For synchronous designs, discrete MOSFETs or dedicated synchronous rectifier controllers must be used instead.
What is the maximum allowable lead temperature during soldering?
The maximum lead temperature is 260°C for 10 seconds, per MIL-STD-202, Method 208. Exceeding this risks internal bond wire damage or delamination. Preheating to 150°C and using controlled iron tip temperature (≤350°C) with ≤3 sec contact time is recommended for hand soldering.
Does SR502-T-F meet RoHS and REACH requirements?
Yes. SR502-T-F is RoHS-compliant (Pb-free terminations, homogeneous material restrictions met) and REACH-conformant (SVHC content below threshold). Certificate of Compliance is available from Diodes Incorporated upon request and applies to all standard production lots.
Can SR502-T-F replace SR503-T-F in a 30 V design?
No. SR502-T-F has VRRM = 20 V and is not rated for 30 V reverse conditions. Substituting it in a 30 V design risks premature breakdown and catastrophic failure. Only SR503-T-F (30 V) or higher-rated variants (SR504–SR506) are appropriate for that voltage class.
SR502-T-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 20 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 @ 20 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
SR502-T-F FAQ
1.How can I place an order for SR502-T-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SR502-T-F 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 SR502-T-F reliable?
The price and inventory of SR502-T-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR502-T-F is usually 5 days.
3.What payment methods are accepted for SR502-T-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR502-T-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SR502-T-F?
SR502-T-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SR502-T-F 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 SR502-T-F?
For technical support, including SR502-T-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR502-T-F requirements.
6.How does Aetrix verify that SR502-T-F is sourced from the original manufacturer or authorized distributors?
All SR502-T-F 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 SR502-T-F meets industry standards.
7.What is the process for return or replacement of SR502-T-F?
All SR502-T-F units undergo pre-shipment inspection (PSI). If there is an issue with SR502-T-F, 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 SR502-T-F part is unused and in its original packaging.
Return procedure for SR502-T-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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