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Diodes Incorporated SR103-T
- Part No.:
- SR103-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
SR103-T.pdf
- Description:
- DIODE SCHOTTKY 30V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:8,533
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Product details
Overview
SR103-T from Diodes Incorporated is a high-current, low-forward-voltage Schottky barrier rectifier in DO-41 axial package, rated for 30 V repetitive peak reverse voltage (VRRM), 1.0 A average forward current at 75°C lead temperature, and 25 A non-repetitive surge current (IFSM). It delivers low power loss with 0.60 V max forward voltage at 1.0 A and features guard-ring protection for transient immunity-used in AC/DC input stage rectification of industrial power supplies.
For engineers reviewing the SR103-T datasheet, SR103-T pinout, SR103-T application, or SR103-T equivalent, key selection criteria include verified VRRM=30 V, VF≤0.60 V @1A, IFSM=25 A, thermal resistance RJL=15 K/W, and DO-41 axial mechanical compatibility with legacy through-hole PCB layouts.
Technical Context
This Schottky rectifier uses a planar epitaxial construction with integrated guard ring to suppress edge breakdown under transient overvoltage conditions. Its low junction-to-lead thermal resistance (15 K/W) enables sustained 1.0 A conduction at TL = 75°C with standard vertical PCB mounting and 9.5 mm lead length.
Electrical behavior is characterized at 25°C ambient unless specified; forward voltage exhibits minimal temperature coefficient, while reverse leakage remains ≤1.0 mA at 25°C and ≤10 mA at 100°C under rated DC blocking voltage (VDC = 30 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 30 V - Maximum repetitive reverse voltage the device blocks without breakdown; defines safe operating limit in bridge or half-wave rectifier configurations. |
| I(AV) | 1.0 A @ TL = 75°C - Average forward current rating with 9.5 mm lead length; derating required above 75°C per Fig. 1. |
| VF | 0.60 V max @ 1.0 A - Forward voltage drop directly impacts conduction loss and thermal load in power conversion stages. |
| IFSM | 25 A - Peak non-repetitive surge current capability (8.3 ms half-sine); critical for handling line-start surges and capacitor-input filter inrush. |
| RJL | 15 K/W - Junction-to-lead thermal resistance; determines temperature rise across leads under steady-state conduction, guiding heatsinking decisions. |
| CT | 80 pF typical @ 4 V, 1 MHz - Junction capacitance affects high-frequency switching noise and EMI in SMPS input stages. |
Pinout & Package
DO-41 axial-leaded plastic package with cathode band marking; leads are solderable per MIL-STD-202, Method 208. Mechanical dimensions: overall length 25.4 mm (max), body diameter 4.1–5.2 mm, lead diameter 0.71–0.86 mm, lead spacing 2.0–2.7 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry point | Connected to AC source or transformer secondary; must withstand full surge current and RMS voltage stress. |
| Cathode (banded end) | Forward current exit / reverse voltage reference | Connected to output rail or smoothing capacitor; polarity marking prevents reverse-bias installation error. |
Key Features
| Feature | Design Value |
|---|---|
| High surge capacity | 25 A IFSM supports robust operation during cold-start inrush in capacitor-input rectifiers. |
| Low forward voltage | 0.60 V max @ 1 A reduces conduction loss by ~30% vs. comparable silicon diodes, lowering thermal design burden. |
| Guard ring structure | Enhances transient voltage immunity and improves long-term reliability under repetitive line spikes. |
| UL 94V-0 rated encapsulant | Ensures flame-retardant compliance in safety-critical industrial and medical power supplies. |
Applications
| AC/DC Adapter Input Stage | Industrial DC Power Supply Input |
|---|---|
Use Scenario: Rectifying 50/60 Hz AC from wall transformer into unregulated DC for linear regulators or buck pre-regulators. IC Role / Device Role / Timing Role: Primary rectifier in single-phase half-wave or full-wave bridge configuration. Use Value: Low VF minimizes heat generation in compact enclosures; DO-41 axial form factor fits legacy adapter PCB footprints. | Use Scenario: Front-end rectification in DIN-rail mounted 24 V DC power supplies powering PLC I/O modules. IC Role / Device Role / Timing Role: High-reliability AC input rectifier subjected to frequent line transients and wide ambient temperature swings. Use Value: Guard ring and 15 K/W thermal resistance enable stable operation at TA = 70°C with no forced airflow. |
| LED Driver Bulk Capacitor Charging | Embedded System Auxiliary Power Supply |
Use Scenario: Charging bulk electrolytic capacitor after bridge rectifier in constant-current LED driver. IC Role / Device Role / Timing Role: Secondary rectifier handling pulsed charging current with high peak-to-average ratio. Use Value: 25 A IFSM accommodates repeated capacitor-charging surges without degradation; low CT limits high-frequency ringing. | Use Scenario: Providing isolated +5 V or +3.3 V auxiliary bias for microcontroller, sensors, and communication ICs. IC Role / Device Role / Timing Role: Low-loss rectifier in flyback or forward converter secondary side. Use Value: 0.60 V VF improves light-load efficiency; UL 94V-0 housing meets IPC-7351B safety clearance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB130-T | VRRM = 30 V, VF = 0.55 V @ 1 A, IFSM = 30 A, same DO-41 package | Lower VF and higher surge rating; optimized for higher-efficiency designs where thermal margin is constrained | Select SB130-T when upgrading for improved conduction loss or surge resilience without layout change. |
| SS13 | VRRM = 30 V, VF = 0.5 V @ 1 A, IFSM = 20 A, SMA surface-mount package | Surface-mount footprint replaces axial leads; lower profile but requires rework of PCB assembly process | Choose SS13 only if transitioning to SMT manufacturing and accepting reduced surge margin. |
Compared with SR103-T, SB130-T offers lower conduction loss and higher surge tolerance in identical packaging, while SS13 enables miniaturization at the cost of leaded-mount compatibility and surge capability.
Availability
SR103-T is available at Aetrix Electronics and suitable for industrial power supplies, AC/DC adapters, and embedded auxiliary power circuits requiring stable component supply and proven through-hole reliability.
Supply support for SR103-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 high-efficiency power management and signal integrity solutions.
The SR-series Schottky rectifiers target cost-sensitive, high-volume power conversion applications where low VF, surge robustness, and axial-mount compatibility are prioritized over ultra-low leakage or RF performance.
FAQ
Is SR103-T RoHS compliant and halogen-free?
Yes. SR103-T meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The DO-41 molded case uses UL 94V-0 compliant epoxy with no brominated flame retardants or chlorine-based additives.
Can SR103-T replace SR102-T in an existing design?
Yes, with verification of reverse voltage margin. SR103-T has VRRM = 30 V versus SR102-T's 20 V; it maintains identical package, thermal characteristics, and forward current rating. Ensure system-level reverse stress does not exceed 30 V before substitution.
What is the maximum allowable lead temperature during hand soldering?
Per Diodes Incorporated's assembly guidelines, peak hand-soldering temperature must not exceed 350°C for ≤3 seconds. Lead length should remain ≥9.5 mm to maintain thermal derating integrity; shorter leads reduce I(AV) capability due to increased junction temperature.
Why is SR103-T marked "NOT RECOMMENDED FOR NEW DESIGN"?
This advisory reflects Diodes Incorporated's product roadmap shift toward the SB1x0 series, which offers improved VF, tighter parameter distribution, and enhanced surge robustness. SR103-T remains fully qualified and supported for legacy production and repair, with no announced obsolescence date.
SR103-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):
- 30 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 @ 30 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
SR103-T FAQ
1.How can I place an order for SR103-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SR103-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 SR103-T reliable?
The price and inventory of SR103-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR103-T is usually 5 days.
3.What payment methods are accepted for SR103-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR103-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SR103-T?
SR103-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SR103-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 SR103-T?
For technical support, including SR103-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR103-T requirements.
6.How does Aetrix verify that SR103-T is sourced from the original manufacturer or authorized distributors?
All SR103-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 SR103-T meets industry standards.
7.What is the process for return or replacement of SR103-T?
All SR103-T units undergo pre-shipment inspection (PSI). If there is an issue with SR103-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 SR103-T part is unused and in its original packaging.
Return procedure for SR103-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SR103-T Tags
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