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Taiwan Semiconductor Corporation SR104
- Part No.:
- SR104
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
SR104.pdf
- Description:
- DIODE SCHOTTKY 40V 1A DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:8,462
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Product details
Overview
SR104 from Taiwan Semiconductor is a 1 A, 40 V repetitive peak reverse voltage Schottky barrier rectifier in DO-204AL (DO-41) package, featuring 0.55 V forward voltage at 1 A and 500 µA reverse leakage at 25°C, used in compact DC/DC converters and AC/DC adapters.
For engineers reviewing the SR104 datasheet, SR104 pinout, SR104 application, or SR104 equivalent, key selection criteria include its AEC-Q101-qualified variant availability, 30 A surge rating, 125°C max junction temperature, and compatibility with lead-free reflow soldering per J-STD-002.
Technical Context
This single-die Schottky rectifier operates with low conduction loss due to its metal–semiconductor junction, enabling high efficiency in high-frequency switching topologies. Its guard ring structure enhances ruggedness against transient overvoltage events without external snubbers.
The device supports continuous forward current up to 1 A at 125°C ambient with derating, and withstands 8.3 ms half-sine surge currents up to 30 A - critical for input rectification stages subject to line transients or cold-start inverter loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - maximum repetitive reverse blocking voltage; defines safe operating limit in bridge or flyback output rectification |
| IF | 1 A - continuous average forward current; sets thermal design baseline for PCB copper area and heatsinking |
| VF @ 1 A, 25°C | 0.55 V - low conduction drop reduces power loss to 550 mW, improving system efficiency vs. PN diodes |
| IR @ VR, 25°C | 500 µA - low leakage enables stable hold-up in standby-mode SMPS without excessive capacitor discharge |
| IFSM | 30 A - non-repetitive surge rating allows robust startup and fault tolerance in unregulated input rails |
| TJ max | 125°C - junction temperature limit constrains thermal design margin when operating near full load at elevated ambient |
| RθJA | 90°C/W - thermal resistance from junction to ambient dictates minimum pad size and via count for 1 A continuous operation |
Pinout & Package
DO-204AL (DO-41) axial-leaded package with cathode band marking; leads are pure tin plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., transformer secondary center-tap or switch node) |
| Cathode | Forward current exit / reverse-blocking terminal | Marked by band; ties to output rail or filter capacitor positive; must be routed with low-inductance path |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring protection | Prevents edge breakdown under transient overvoltage, eliminating need for external clamping in cost-sensitive adapters |
| AEC-Q101 qualification option | Validated reliability for automotive cabin electronics where temperature cycling and vibration endurance are required |
| UL 94V-0 molding compound | Ensures flame retardancy in enclosed power supplies meeting IEC 62368-1 safety standards |
| Halogen-free construction | Complies with IEC 61249-2-21, supporting RoHS and WEEE compliance for global market access |
Applications
| AC/DC Adapter Rectification | USB-C PD Power Supply Output Stage |
|---|---|
Use Scenario: Low-profile wall adapters converting 90–264 VAC to 5–20 VDC for consumer electronics. IC Role / Device Role / Timing Role: Output rectifier in quasi-resonant flyback topology, conducting during transformer reset phase. Use Value: 0.55 V VF minimizes conduction loss at 1 A output, enabling >88% efficiency in 25 mm height designs. | Use Scenario: Secondary-side synchronous rectification replacement in 45 W USB-C PD chargers. IC Role / Device Role / Timing Role: Discrete Schottky rectifier replacing MOSFET-based sync rectifiers where control complexity must be minimized. Use Value: Eliminates gate drive circuitry while maintaining <1.2 W total loss at 3 A peak, simplifying BOM and layout. |
| Industrial DC/DC Converter Input Protection | Automotive Infotainment Power Rail Clamp |
Use Scenario: 24 V input DC/DC modules powering PLC I/O cards in factory automation cabinets. IC Role / Device Role / Timing Role: Reverse polarity and surge protection diode on main 24 V bus input, placed before primary-side controller. Use Value: 30 A IFSM withstands 500 ms load dump transients per ISO 7637-2 Pulse 5a without failure. | Use Scenario: 12 V power conditioning for head unit display backlight drivers in vehicles. IC Role / Device Role / Timing Role: Clamping diode across buck converter output to suppress inductive kickback from LED string switching. Use Value: AEC-Q101-qualified SR104H variant ensures 1000-cycle temperature cycling survival from −40°C to +125°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay SS14 | Same 1 A / 40 V rating, but VF = 0.5 V typical (slightly lower loss); RθJA = 100°C/W (higher thermal resistance) | Preferred in space-constrained layouts where 0.05 V lower VF offsets thermal penalty | Select SS14 only if board-level thermal simulation confirms adequate derating at 125°C ambient |
| ON Semiconductor SB140 | Identical DO-41 package and 40 V rating; VF = 0.52 V typical; IR = 1 mA @ 25°C (2× higher leakage) | Better for cost-driven consumer adapters where leakage impact on standby is mitigated by auxiliary supply shutdown | Choose SB140 when BOM cost reduction outweighs 0.5 mA extra standby drain in always-on systems |
Compared with SS14 and SB140, SR104 offers tighter reverse leakage (500 µA vs. ≥1 mA), verified guard ring ruggedness, and optional AEC-Q101 qualification - making it optimal for industrial and automotive-adjacent power rails demanding long-term reliability.
Availability
SR104 is available at Aetrix Electronics and suitable for AC/DC adapters, DC/DC converters, and automotive infotainment power supplies requiring stable component supply, consistent parametric performance, and traceable manufacturing history.
Supply support for SR104 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving industrial, computing, and consumer markets since 1979.
The SR102–SR115 series was designed specifically for high-efficiency, low-profile power conversion in cost-sensitive and thermally constrained applications - emphasizing ruggedness, manufacturability, and regulatory compliance.
FAQ
What is the maximum junction temperature rating for SR104?
The SR104 has a maximum junction temperature (TJ) of 125°C under standard operating conditions. This rating applies to the base SR104 variant; the AEC-Q101-qualified SR104H extends TJ to 150°C. Thermal design must ensure junction temperature remains below this limit during worst-case load and ambient conditions, using the specified 90°C/W junction-to-ambient thermal resistance.
Does SR104 support lead-free reflow soldering?
Yes, SR104 features pure tin-plated leads compliant with J-STD-002 for solderability, and its DO-204AL (DO-41) package is rated for standard lead-free reflow profiles including peak temperatures up to 260°C. The molding compound meets UL 94V-0 flammability requirements, ensuring process compatibility and safety in automated assembly lines.
Is SR104 pin-compatible with other devices in the SR102–SR115 family?
Yes, all SR102–SR115 devices share identical DO-204AL (DO-41) mechanical dimensions, anode/cathode pinout, and axial lead configuration. This allows direct substitution across the voltage range (20 V to 150 V) without PCB layout changes - provided electrical parameters such as VRRM, VF, and IR meet the target application's requirements.
What is the reverse leakage current specification for SR104 at elevated temperature?
At 100°C junction temperature, SR104 exhibits a maximum reverse leakage current (IR) of 10 mA when biased at its rated VRRM of 40 V. This value is confirmed in the Electrical Specifications table and is critical for evaluating hold-up time in offline SMPS designs operating in hot environments.
How does the guard ring feature improve reliability in SR104?
The guard ring in SR104 prevents premature edge breakdown during voltage transients by controlling electric field distribution at the die periphery. This structural enhancement allows the device to sustain dv/dt stress up to 10,000 V/µs without external snubbers - increasing robustness in flyback and LLC resonant converters where rapid voltage transitions occur across the rectifier.
SR104 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 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:
- 500 µA @ 40 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
- Operating Temperature - Junction:
- -55°C ~ 125°C
SR104 FAQ
1.How can I place an order for SR104 through Aetrix?
Please submit a Request for Quotation (RFQ) for SR104 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 SR104 reliable?
The price and inventory of SR104 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR104 is usually 5 days.
3.What payment methods are accepted for SR104?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR104 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SR104?
SR104 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SR104 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 SR104?
For technical support, including SR104 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR104 requirements.
6.How does Aetrix verify that SR104 is sourced from the original manufacturer or authorized distributors?
All SR104 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 SR104 meets industry standards.
7.What is the process for return or replacement of SR104?
All SR104 units undergo pre-shipment inspection (PSI). If there is an issue with SR104, 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 SR104 part is unused and in its original packaging.
Return procedure for SR104:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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