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Diodes Incorporated SR104-T
- Part No.:
- SR104-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
SR104-T.pdf
- Description:
- DIODE SCHOTTKY 40V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:3,821
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Product details
Overview
SR104-T from Diodes Incorporated is a high-current, low-forward-drop Schottky barrier rectifier in DO-41 axial package, rated for 40 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 converter output stages and AC-DC front-end rectification where efficiency and thermal performance are critical.
For engineers reviewing the SR104-T datasheet, SR104-T pinout, SR104-T application, or SR104-T equivalent, key selection considerations include its 0.70 V forward voltage at 1.0 A, 110 pF typical junction capacitance at 4.0 V, 15 K/W thermal resistance (junction-to-lead), 1.0 mA max reverse leakage at 25°C, and DO-41 mechanical compatibility with legacy through-hole power supplies.
Technical Context
This Schottky rectifier uses a guard-ringed die structure to enhance transient voltage immunity and reduce leakage under high reverse bias. Its metal–semiconductor junction enables fast switching (no minority-carrier storage) and eliminates reverse recovery charge, making it suitable for high-frequency switching topologies up to several hundred kHz.
The device operates across –65°C to +150°C junction temperature range and is rated for vertical PCB mounting with 1.27 mm lead length. Its UL 94V-0 molded plastic case and axial solderable leads comply with MIL-STD-202 Method 208 for reliability in industrial power conversion environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum sustainable reverse voltage before breakdown; defines usable input voltage headroom in 24 V or 36 V DC systems. |
| I(AV) | 1.0 A @ TL = 75°C - Continuous DC output current capability with 9.5 mm lead length; derates to ~0.7 A at 100°C. |
| VF | 0.70 V @ 1.0 A - Low conduction loss reduces heat generation in high-duty-cycle rectifiers. |
| IFSM | 25 A, 8.3 ms half-sine - Withstands inrush surges from capacitive inputs or cold-start conditions without failure. |
| CT | 110 pF @ 4.0 V, 1.0 MHz - Limits high-frequency noise coupling and affects EMI filter design in SMPS outputs. |
| RJL | 15 K/W - Thermal resistance from junction to lead; enables estimation of junction temperature rise above ambient using measured lead temp. |
Pinout & Package
DO-41 axial-leaded package: cylindrical molded plastic body with cathode band marking; leads are tinned copper, solderable per MIL-STD-202 Method 208; polarity indicated by single black band on cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded lead) | Input current entry point | Connected to higher-potential node (e.g., transformer secondary or switch-node); must withstand full surge current. |
| Cathode (banded lead) | Output current exit point | Connected to output capacitor or load; carries full average current and defines reference for voltage drop measurement. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Improves transient voltage immunity and stabilizes reverse leakage under fast-rising dv/dt conditions. |
| Low VF at rated current | 0.70 V @ 1.0 A reduces conduction losses by ~30% vs. comparable silicon rectifiers, lowering heatsink requirements. |
| High surge rating | 25 A IFSM supports robust operation during line transients or capacitor charging without bond-wire fusing. |
| UL 94V-0 flammability | Ensures flame-retardant housing integrity under fault-induced overheating in enclosed power supplies. |
Applications
| AC-DC Adapter Output Stage | DC-DC Converter Secondary Rectifier |
|---|---|
Use Scenario: 12 V/1 A wall adapter with bridge rectifier and linear regulator or buck post-regulator. IC Role / Device Role / Timing Role: Output rectifier converting transformer AC to regulated DC; handles continuous 1 A load with minimal voltage drop. Use Value: 0.70 V VF minimizes dropout and thermal stress, enabling compact enclosure without forced airflow. | Use Scenario: Isolated flyback or forward converter delivering 5 V/1 A to microcontroller subsystems. IC Role / Device Role / Timing Role: Synchronous rectification alternative where gate drive complexity is avoided; placed on secondary winding. Use Value: Zero reverse recovery eliminates switching loss spikes, improving light-load efficiency over 85%. |
| Industrial Sensor Power Supply | LED Driver Output Rectification |
Use Scenario: 24 V input power module powering analog sensors in PLC I/O modules. IC Role / Device Role / Timing Role: Input-stage rectifier feeding bulk capacitor; exposed to 100 V surge events per IEC 61000-4-5. Use Value: Guard ring and 25 A IFSM sustain repeated 1 kV/2 Ω surges without parameter shift or failure. | Use Scenario: Constant-current LED driver with transformer-isolated output and capacitive filtering. IC Role / Device Role / Timing Role: Final rectifier before smoothing capacitor; conducts pulsed current at 100–200 kHz switching frequency. Use Value: 110 pF CT limits high-frequency ringing, reducing conducted EMI without adding snubber components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB140-T | Same DO-41 package, 40 V VRRM, but lower VF (0.55 V @ 1 A) and higher IFSM (30 A); newer process with tighter IR spec. | Better suited for high-efficiency, thermally constrained designs; replaces SR104-T where <0.6 V VF is required. | Select SB140-T when upgrading legacy designs for improved efficiency or extended surge margin. |
| SS14 | DO-214AC (SMA) surface-mount package; identical 40 V/1 A ratings but VF = 0.55 V and CT = 100 pF; no axial leads. | Requires PCB rework for SMT assembly; not mechanically interchangeable in through-hole layouts. | Choose SS14 only for new SMT-based designs prioritizing board space savings over leaded compatibility. |
Compared with SR104-T, SB140-T offers superior forward voltage and surge rating in the same footprint, while SS14 provides identical electrical performance in a smaller SMT package-neither is a drop-in replacement without layout or thermal interface changes.
Availability
SR104-T is available at Aetrix Electronics and suitable for AC-DC adapters, industrial sensor power supplies, DC-DC converter secondary stages, and LED driver output rectification requiring stable component supply and long-term obsolescence management.
Supply support for SR104-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 SR series Schottky rectifiers target cost-sensitive, high-volume power conversion applications where reliability, thermal stability, and legacy package compatibility are essential design constraints.
FAQ
What is the maximum operating temperature for SR104-T?
The SR104-T has a specified junction and storage temperature range of –65°C to +150°C. Its thermal resistance (RJL = 15 K/W) allows safe operation up to 150°C junction temperature when lead temperature is maintained ≤100°C per derating curve. Ambient temperature limits depend on PCB layout and airflow.
Is SR104-T suitable for synchronous rectification?
No-SR104-T is a passive Schottky diode, not a controlled MOSFET. It cannot be actively gated like a synchronous rectifier. However, it serves as a low-loss, zero-recovery alternative in low-power flyback or forward converters where gate-drive complexity must be avoided.
Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGN"?
This note reflects Diodes Incorporated's product roadmap: the SB1X0 series (e.g., SB140-T) supersedes SR104-T with improved VF, tighter IR, and enhanced surge robustness. SR104-T remains fully qualified and supported for existing designs and legacy replacements.
Can SR104-T replace a 1N5819 in a 5 V/1 A supply?
Yes-SR104-T matches 1N5819's 40 V VRRM and 1 A I(AV) rating, but offers lower VF (0.70 V vs. typical 0.475 V at 0.5 A for 1N5819) and higher IFSM (25 A vs. 20 A). At 1 A, SR104-T's VF is slightly higher, so verify thermal margin and efficiency targets before substitution.
SR104-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):
- 40 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 600 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 mA @ 40 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
SR104-T FAQ
1.How can I place an order for SR104-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SR104-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 SR104-T reliable?
The price and inventory of SR104-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR104-T is usually 5 days.
3.What payment methods are accepted for SR104-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR104-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SR104-T?
SR104-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SR104-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 SR104-T?
For technical support, including SR104-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR104-T requirements.
6.How does Aetrix verify that SR104-T is sourced from the original manufacturer or authorized distributors?
All SR104-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 SR104-T meets industry standards.
7.What is the process for return or replacement of SR104-T?
All SR104-T units undergo pre-shipment inspection (PSI). If there is an issue with SR104-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 SR104-T part is unused and in its original packaging.
Return procedure for SR104-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SR104-T Tags
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