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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Diodes Incorporated SR105-T

Name: SR105-T
Brand: Diodes Incorporated
SKU: SR105-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SR105-T

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: SR105-T.pdf

Description:: DIODE SCHOTTKY 50V 1A DO41

Quantity:: RFQ Add To RFQ list

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Inventory:5,696

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Product details

Overview

SR105-T from Diodes Incorporated is a high-current, low-forward-drop Schottky barrier rectifier in DO-41 axial package, rated for 50 V maximum recurrent peak reverse voltage, 1.0 A average forward rectified current at 75°C lead temperature, and 25 A non-repetitive peak forward surge current. It delivers high efficiency in low-voltage DC power supplies and AC/DC adapters where low conduction loss and fast switching are critical.

For engineers reviewing the SR105-T datasheet, SR105-T pinout (anode/cathode axial leads), SR105-T application in low-loss rectification, or SR105-T equivalent for 50 V/1 A Schottky replacement, this page provides verified electrical parameters, thermal behavior, mechanical dimensions, and validated alternatives aligned with JEDEC test conditions and UL 94V-0 compliance.

Technical Context

This device operates as a unidirectional power rectifier with metal–semiconductor junction architecture, optimized for minimal forward voltage drop and rapid recovery-no minority-carrier storage delay. Its guard ring structure enhances transient voltage immunity, and its axial DO-41 package enables through-hole mounting on vertical PCBs with defined thermal resistance of 15 K/W (junction-to-lead).

Rated for continuous operation from –65°C to +150°C, it exhibits 110 pF typical junction capacitance at 4.0 V reverse bias and 1.0 mA maximum reverse leakage at 25°C, making it suitable for high-frequency, low-noise secondary-side rectification in switch-mode power supplies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - Maximum repetitive reverse blocking capability without breakdown under normal operating conditions.
I_(AV)	1.0 A @ T_L = 75°C - Sustained DC output current with 9.5 mm lead length; derate linearly above 75°C per Fig. 1.
V_F	0.70 V @ 1.0 A - Low conduction loss enabling >90% efficiency in 3.3–5 V output rails.
I_FSM	25 A, 8.3 ms half-sine - Withstands inrush surges common during AC input cycling or cold-start in offline SMPS.
R_θJL	15 K/W - Quantifies thermal path from junction to lead; used with lead temp to estimate max junction temp.
C_T	110 pF @ 4.0 V, 1.0 MHz - Limits high-frequency noise coupling and affects EMI filter design in flyback outputs.

Pinout & Package

DO-41 molded plastic package with axial leads; cathode identified by band. Lead finish solderable per MIL-STD-202, Method 208. Dimensions: A = 25.4 mm (max), B = 4.1–5.2 mm, C = 0.71–0.86 mm, D = 2.0–2.7 mm. Weight ≈ 0.35 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Input terminal for forward conduction	Connected to transformer secondary or switching node; carries full load current during positive half-cycle.
Cathode (banded end)	Output terminal for forward conduction	Feeds filtered DC bus; polarity marking ensures correct orientation to prevent reverse-bias failure.

Key Features

Feature	Design Value
High surge capacity	25 A I_FSM withstands repeated cold-start events without degradation.
Low forward voltage	0.70 V @ 1.0 A reduces conduction loss by ~30% vs. standard PN rectifiers at same rating.
Guard ring protection	Enhances ruggedness against ESD and line transients per IEC 61000-4-2 Level 3.
UL 94V-0 flammability	Self-extinguishing epoxy meets safety standards for enclosed power supplies.

Applications

AC/DC Adapter Secondary Rectification

USB Power Delivery Output Stage

Use Scenario: 5 V/2 A output stage in wall-mounted AC/DC adapter with flyback topology.

IC Role / Device Role / Timing Role: Primary unidirectional power rectifier converting transformer AC to DC; no timing function.

Use Value: 0.70 V V_F minimizes heat generation at 2 A, enabling compact heatsink-free design per thermal derating curve.

Use Scenario: Secondary-side rectification in USB PD 3.0 compliant 5–20 V programmable supply.

IC Role / Device Role / Timing Role: Discrete Schottky diode providing low-loss DC output path; no control or communication role.

Use Value: 110 pF C_T limits high-frequency ringing, easing EMI compliance in 100–300 kHz SMPS designs.

Industrial 24 V DC Power Supply

LED Driver Constant-Current Stage

Use Scenario: Input rectification for DIN-rail mounted 24 V/3 A industrial power module.

IC Role / Device Role / Timing Role: High-reliability mains-input rectifier handling 100% load continuously at 60°C ambient.

Use Value: R_θJL = 15 K/W allows junction temperature ≤125°C with proper lead length and board copper area.

Use Scenario: Output rectifier in isolated LED driver feeding constant-current buck stage.

IC Role / Device Role / Timing Role: Freewheeling/rectifying diode in secondary synchronous rectification circuit.

Use Value: Guard ring structure prevents premature failure during LED string open-circuit transients.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SB150-T	Same DO-41 package, 50 V V_RRM, but lower V_F = 0.55 V @ 1.0 A and higher I_FSM = 30 A.	Better suited for thermally constrained 5 V/3 A adapters requiring <0.6 V drop.	Select when lower conduction loss and higher surge margin outweigh cost sensitivity.
SS15-E3/5AT	DO-214AC (SMA) surface-mount package, 50 V V_RRM, V_F = 0.55 V @ 1.0 A, I_FSM = 30 A.	Requires rework of PCB layout; eliminates axial lead insertion but increases assembly complexity.	Choose for automated SMT production and space-constrained layouts where through-hole is not feasible.

Compared with SR105-T, SB150-T offers superior thermal performance and surge robustness in identical packaging, while SS15-E3/5AT trades axial mount simplicity for SMT scalability and slightly better electrical specs-both require validation of thermal pad layout or lead-forming tooling.

Availability

SR105-T is available at Aetrix Electronics and suitable for AC/DC adapters, industrial 24 V power supplies, and USB PD output stages requiring stable component supply, long-term manufacturability, and UL-certified reliability.

Supply support for SR105-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, headquartered in Plano, Texas, with design centers across Asia and Europe.

The SR-series Schottky rectifiers target cost-sensitive, high-volume power conversion applications where low VF, surge tolerance, and regulatory compliance are prioritized over ultra-high-speed switching.

FAQ

Is SR105-T RoHS compliant and halogen-free?

Yes. SR105-T meets RoHS Directive 2011/65/EU and is halogen-free per Diodes Incorporated specification DS23002 Rev. 5, confirmed by material declarations and manufacturing process controls. No brominated flame retardants are used in the UL 94V-0 epoxy molding compound.

Can SR105-T replace SR104-T in an existing design?

Yes, with verification. SR105-T has identical DO-41 package and thermal characteristics but higher V_RRM (50 V vs. 40 V) and slightly higher V_F (0.70 V vs. 0.60 V @ 1.0 A). Ensure reverse voltage stress remains below 50 V and thermal margin accommodates the 0.1 V increase in conduction loss.

What is the maximum allowable lead temperature during soldering?

The maximum lead temperature is 260°C for 10 seconds per J-STD-020A, consistent with DO-41 axial lead specifications. Reflow or wave solder profiles must avoid exceeding this limit to prevent internal bond wire damage or epoxy delamination.

Why is SR105-T marked "NOT RECOMMENDED FOR NEW DESIGN"?

This notice reflects Diodes Incorporated's product roadmap shift toward the SB1x0 series, which offers improved V_F, higher I_FSM, and enhanced surge robustness. SR105-T remains fully qualified and supported for legacy production and repair, with no announced discontinuance date.

SR105-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):: 50 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 700 mV @ 1 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 1 mA @ 50 V

Capacitance @ Vr, F:: 80pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-41

Operating Temperature - Junction:: -65°C ~ 150°C

SR105-T FAQ

1.How can I place an order for SR105-T through Aetrix?

Please submit a Request for Quotation (RFQ) for SR105-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 SR105-T reliable?

The price and inventory of SR105-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR105-T is usually 5 days.

3.What payment methods are accepted for SR105-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR105-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SR105-T?

SR105-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SR105-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 SR105-T?

For technical support, including SR105-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR105-T requirements.

6.How does Aetrix verify that SR105-T is sourced from the original manufacturer or authorized distributors?

All SR105-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 SR105-T meets industry standards.

7.What is the process for return or replacement of SR105-T?

All SR105-T units undergo pre-shipment inspection (PSI). If there is an issue with SR105-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 SR105-T part is unused and in its original packaging.

Return procedure for SR105-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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