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Diodes Incorporated SR102-T
- Part No.:
- SR102-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
SR102-T.pdf
- Description:
- DIODE SCHOTTKY 20V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
SR102-T from Diodes Incorporated is a high-current, low-forward-drop Schottky barrier rectifier in DO-41 axial package, rated for 20 V maximum recurrent peak reverse voltage (VRRM), 1.0 A average forward rectified current at 75°C lead temperature, and 25 A non-repetitive peak forward surge current (IFSM). It delivers low power loss in DC/DC output rectification and reverse polarity protection circuits.
For engineers reviewing the SR102-T datasheet, SR102-T pinout, SR102-T application, or SR102-T equivalent, key selection criteria include its 0.55 V forward voltage at 1.0 A, 15 K/W junction-to-lead thermal resistance, 110 pF typical total capacitance at 4.0 V reverse bias, and DO-41 mechanical compatibility with through-hole PCB layouts requiring axial-leaded high-efficiency rectifiers.
Technical Context
The SR102-T employs a planar Schottky barrier structure with guard ring design to suppress edge breakdown and improve transient surge robustness. Its low VF and high IFSM support high-efficiency secondary-side rectification in offline SMPS and battery-powered systems where conduction loss and surge immunity are critical.
Thermal performance is defined by junction-to-lead resistance (15 K/W), not junction-to-ambient, requiring proper lead length (9.5 mm) and board mounting per JEDEC standards. Capacitance (110 pF @ 4 V, 1 MHz) and reverse leakage (1.0 mA @ 20 V, 25°C) reflect trade-offs between speed, leakage, and voltage rating inherent to 20 V-class Schottky devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum repetitive reverse voltage before avalanche; sets upper limit for blocking capability in DC/DC or reverse polarity circuits. |
| I(AV) | 1.0 A @ TL = 75°C - Continuous forward current rating with 9.5 mm lead length; derates to ~0.7 A at 100°C lead temp. |
| VF | 0.55 V @ IF = 1.0 A - Low conduction loss enables higher efficiency than PN diodes; reduces heat generation in compact layouts. |
| IFSM | 25 A @ 8.3 ms half-sine - Withstands inrush surges during power-up or load transients without failure. |
| CT | 110 pF @ VR = 4.0 V, 1 MHz - Limits high-frequency switching noise and affects EMI filtering requirements in SMPS outputs. |
| RJL | 15 K/W - Thermal resistance from junction to lead; requires adequate copper pour and lead length control for thermal management. |
Pinout & Package
DO-41 molded plastic axial package with cathode band marking; leads are solderable per MIL-STD-202, Method 208. Weight: 0.35 g. UL 94V-0 flammability rating. Moisture sensitivity Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry point | Connected to lower-potential side (e.g., ground or return path) in rectification; must handle full load current and surge. |
| Cathode (banded end) | Forward current exit / reverse blocking terminal | Connected to higher-potential node (e.g., output rail); reverse voltage applied here during off-state; band identifies polarity for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| High surge capacity | 25 A IFSM supports repeated cold-start events in industrial power supplies without degradation. |
| Low forward voltage drop | 0.55 V at 1.0 A reduces conduction loss by >40% vs. comparable 1N400x PN rectifiers, improving system efficiency. |
| Guard ring structure | Enhances transient voltage immunity and prevents premature edge breakdown under fast-rising reverse transients. |
| DO-41 axial mechanical form | Enables manual assembly and wave soldering; compatible with legacy through-hole footprints and automated taping equipment. |
Applications
| AC-DC Adapter Output Rectification | Reverse Polarity Protection |
|---|---|
Use Scenario: Secondary-side rectification in 5–24 V wall adapters powering consumer electronics. IC Role / Device Role / Timing Role: Schottky rectifier conducting forward current during positive half-cycle; blocks reverse voltage during off-time. Use Value: 0.55 V VF minimizes heat rise in confined enclosures; 25 A IFSM handles capacitor charging surges without derating. | Use Scenario: Input protection for USB-powered peripherals and IoT sensors against incorrect power connection. IC Role / Device Role / Timing Role: Anode tied to input supply, cathode to system rail; conducts only when polarity is correct. Use Value: Low VF ensures minimal voltage drop (<0.6 V) across protection path, preserving operating margin for 3.3 V or 5 V logic. |
| DC/DC Converter Synchronous Rectifier Replacement | Automotive Accessory Power Supply |
Use Scenario: Low-cost replacement for active synchronous rectifiers in low-power isolated flyback converters. IC Role / Device Role / Timing Role: Passive rectifier replacing MOSFET + driver; no control timing required. Use Value: Eliminates gate drive complexity and cost while maintaining <1 V output loss at 1 A, suitable for <5 W designs. | Use Scenario: 12 V input conditioning for infotainment USB hubs and LED lighting modules in passenger vehicles. IC Role / Device Role / Timing Role: Reverse polarity clamp on main power rail; withstands load dump transients via guard ring and surge rating. Use Value: 20 V VRRM and 25 A IFSM meet ISO 7637-2 Pulse 1/2a requirements when combined with TVS clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB120-T | Same DO-41 package, 20 V VRRM, but lower VF (0.50 V @ 1 A) and higher IFSM (30 A); uses advanced epitaxial process. | Better suited for thermally constrained 5 W adapters where <0.55 V drop is critical. | Select SB120-T if efficiency gain justifies minor cost increase and footprint compatibility is confirmed. |
| 1N5817 | Legacy DO-41 Schottky; 20 V VRRM, but higher VF (0.45 V min, typically 0.55–0.65 V), lower IFSM (25 A same, but less consistent surge margin). | Acceptable for non-surge-critical linear supplies; lacks guard ring, limiting transient robustness. | Prefer SR102-T over 1N5817 where ISO-compliant surge immunity or long-term reliability in automotive-adjacent use is required. |
Compared with SB120-T and 1N5817, the SR102-T offers balanced VF, surge, and transient performance with verified guard ring protection-making it optimal for cost-sensitive industrial adapters needing proven ruggedness without premium pricing.
Availability
SR102-T is available at Aetrix Electronics and suitable for AC-DC adapters, reverse polarity protection circuits, DC/DC converter outputs, and automotive accessory power supplies requiring stable component supply and DO-41 axial lead compatibility.
Supply support for SR102-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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.
The SR102-T belongs to the SRxx series of high-current Schottky rectifiers designed for efficient, reliable, and cost-effective power conversion in consumer, industrial, and automotive auxiliary power systems.
FAQ
Is SR102-T RoHS compliant and halogen-free?
Yes. SR102-T meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The DO-41 molding compound and lead finish (matte tin) comply with all applicable substance restrictions, including lead-free reflow profiles up to 260°C peak.
Can SR102-T replace a 1N4001 in a 12 V power supply?
No. While both are DO-41 rectifiers, the 1N4001 is a silicon PN diode (1.1 V VF, 50 V VRRM), whereas SR102-T is a 20 V Schottky with 0.55 V VF. Substituting it into a 50 V circuit risks reverse breakdown; it is only safe in ≤20 V blocking applications.
What is the maximum allowable lead temperature during soldering?
The SR102-T supports wave soldering per MIL-STD-202, Method 208, with peak lead temperature not exceeding 260°C for ≤10 seconds. Hand soldering should use iron tip temperature ≤350°C and contact time <3 seconds per lead to avoid internal bond damage.
Does SR102-T require heatsinking in 1 A continuous operation?
No external heatsink is required at 1 A if mounted vertically on a PCB with 9.5 mm lead length and ≥1 cm² copper pour per lead. Junction temperature remains below 125°C at TA = 50°C due to 15 K/W RJL and low VF; thermal derating begins above 75°C ambient.
SR102-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 20 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 mA @ 20 V
- Capacitance @ Vr, F:
- 110pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
- Operating Temperature - Junction:
- -65°C ~ 150°C
SR102-T FAQ
1.How can I place an order for SR102-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SR102-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 SR102-T reliable?
The price and inventory of SR102-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR102-T is usually 5 days.
3.What payment methods are accepted for SR102-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR102-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SR102-T?
SR102-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SR102-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 SR102-T?
For technical support, including SR102-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR102-T requirements.
6.How does Aetrix verify that SR102-T is sourced from the original manufacturer or authorized distributors?
All SR102-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 SR102-T meets industry standards.
7.What is the process for return or replacement of SR102-T?
All SR102-T units undergo pre-shipment inspection (PSI). If there is an issue with SR102-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 SR102-T part is unused and in its original packaging.
Return procedure for SR102-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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