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

Diodes Incorporated SB520-T

Name: SB520-T
Brand: Diodes Incorporated
SKU: SB520-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SB520-T

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SB520-T.pdf

Description:: DIODE SCHOTTKY 20V 5A DO201AD

Quantity:: RFQ Add To RFQ list

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Inventory:3,557

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Product details

Overview

SB520-T from Diodes Incorporated is a 5.0A, 20V Schottky barrier rectifier in DO-201AD package, featuring 0.55V forward voltage at 5.0A, 150A non-repetitive surge capability, and guard ring die construction for transient protection-used in low-voltage DC/DC converter freewheeling paths and polarity protection circuits.

For engineers reviewing the SB520-T datasheet, SB520-T pinout, SB520-T application, or SB520-T equivalent, key selection criteria include forward voltage drop at rated current, peak repetitive reverse voltage rating, thermal resistance junction-to-lead (8°C/W), surge robustness (150A), and RoHS-compliant bright tin plating for reliable solderability.

Technical Context

This Schottky rectifier employs epitaxial construction and a guard ring die design to suppress avalanche breakdown and improve transient immunity. Its low V_F enables high-efficiency operation in 12V and 5V power rails where conduction loss minimization is critical.

Rated for continuous 5.0A average output current with 25°C/W junction-to-ambient thermal resistance (PCB-mounted), it supports operation from –65°C to +125°C junction temperature and withstands 150A surge pulses per JEDEC 8.3ms half-sine standard.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	20 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in reverse-biased polarity protection or flyback clamp applications.
I_O	5.0 A - Average rectified forward current; specifies continuous DC output capability under specified thermal conditions (T_A = 25°C, PCB mount).
V_FM	0.55 V @ 5.0A - Forward voltage drop; directly determines conduction loss (2.75W at full load) and impacts thermal design in compact power supplies.
I_FSM	150 A - Non-repetitive peak surge current; enables survival during inrush or fault transients in motor drive or battery-charging circuits.
R_θJL	8 °C/W - Junction-to-lead thermal resistance; enables accurate junction temperature estimation when lead is used as primary heat path (e.g., chassis-mount or heavy copper trace).
T_J Range	–65°C to +125°C - Operational junction temperature range; supports industrial and automotive under-hood environments without derating.

Pinout & Package

Package: DO-201AD molded plastic case (UL 94V-0), cathode band polarity marking, 1.1g weight, bright tin-plated leads solderable per MIL-STD-202 Method 208.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to input/source side in rectification; must handle full 5.0A DC and 150A surge without bond wire fusing.
Cathode	Forward current exit / reverse-blocking terminal	Marked by band; ties to output/load ground or return path; sustains 20V reverse bias continuously and blocks leakage ≤0.5mA at 25°C.

Key Features

Feature	Design Value
Guard ring die construction	Suppresses edge breakdown and improves surge immunity-critical for reliability in unregulated input or inductive load switching.
Low forward voltage (0.55V)	Reduces conduction loss by ~30% vs. comparable silicon diodes, lowering thermal stress in space-constrained 5–12V power stages.
150A surge rating	Withstands motor startup currents or capacitor charging surges without degradation-enables use without external TVS in many 24V systems.
RoHS-compliant bright tin plating	Ensures consistent wetting and joint integrity during reflow or wave soldering; eliminates lead-related reliability concerns in long-life industrial gear.

Applications

DC/DC Converter Freewheeling

Polarity Protection

Use Scenario: Used as synchronous rectifier or freewheeling diode in 5V/12V buck converters driving FPGAs or microcontrollers.

IC Role / Device Role: Provides low-loss current recirculation path during high-side switch off-time, minimizing voltage overshoot and improving efficiency.

Use Value: 0.55V V_F reduces power loss by >1.5W vs. standard PN diode at 5A, lowering heatsink requirements in sealed enclosures.

Use Scenario: Placed in series with power input to prevent damage from reversed battery or supply connections in portable instrumentation.

IC Role / Device Role: Acts as series blocking element; conducts only when polarity is correct, leveraging 20V V_RRM margin above 12V nominal rail.

Use Value: Low V_F limits voltage drop to <0.6V-preserving >95% of input voltage for sensitive analog front-ends.

Low-Voltage Inverter Output

Automotive Accessory Power Rail

Use Scenario: Output rectification stage in 24V-to-12V isolated inverters for LED lighting or HVAC blower control.

IC Role / Device Role: Converts high-frequency AC from transformer secondary into regulated DC; handles 5A continuous plus 150A surge during motor stall events.

Use Value: Guard ring die ensures stable reverse characteristics across –40°C to +125°C ambient, meeting automotive thermal cycling requirements.

Use Scenario: Reverse-polarity protection on 12V accessory bus powering infotainment modules and USB hubs in passenger compartments.

IC Role / Device Role: Series-connected Schottky placed before LDO regulators; blocks reverse current while maintaining minimal dropout under cold-crank (6.5V min).

Use Value: 0.55V forward drop allows operation down to 6.05V input-ensuring uninterrupted function during ISO 16750-2 cold-crank profiles.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SB520-E3/54 (Vishay)	Same DO-201AD package, identical 20V/5A ratings, but V_F = 0.57V @ 5A and I_FSM = 120A.	Limited surge headroom in motor-start scenarios; requires verification against 150A requirement.	Select if sourcing flexibility is prioritized and surge margin can be validated in system-level testing.
SS52 (ON Semiconductor)	DO-214AC (SMA) package, 20V/5A, V_F = 0.52V @ 5A, I_FSM = 100A, R_θJA = 40°C/W.	Higher thermal resistance and lower surge rating; unsuitable for high-reliability freewheeling in high-ambient environments.	Only consider for cost-sensitive, low-power applications where board space constraints favor SMA over DO-201AD.

Compared with SB520-E3/54 and SS52, SB520-T delivers superior surge robustness (150A vs. 120A/100A) and lower thermal resistance (R_θJL = 8°C/W), making it preferred for industrial power supplies and automotive accessories requiring sustained 5A operation with transient resilience.

Availability

SB520-T is available at Aetrix Electronics and suitable for DC/DC converter freewheeling, polarity protection, and low-voltage inverter output applications requiring stable component supply, tape-and-reel delivery, and RoHS-compliant manufacturing.

Supply support for SB520-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 California and operating ISO/TS 16949-certified facilities worldwide.

The SB520-T belongs to the SB5x0 Schottky rectifier product line, engineered for high-efficiency, low-voltage power conversion in industrial, computing, and automotive subsystems where low forward voltage and surge resilience are essential.

FAQ

What is the maximum junction temperature for SB520-T during continuous operation?

The SB520-T has a rated junction temperature range of –65°C to +125°C. Under continuous 5.0A DC load with proper PCB thermal relief (e.g., ≥1 in² 2-oz copper pour), junction temperature remains within spec if ambient stays ≤85°C-verified via R_θJA = 25°C/W and power dissipation of 2.75W.

Is SB520-T suitable for automotive under-hood applications?

SB520-T meets the temperature and surge requirements for many under-hood applications (–40°C to +125°C ambient), but it is not AEC-Q101 qualified. For automotive safety-critical systems, Diodes offers AEC-Q101 variants like SB520Q-T; consult Diodes' automotive product definitions before deployment.

How does the guard ring die construction improve reliability?

The guard ring structure surrounds the active junction to distribute electric field gradients and suppress premature edge breakdown. This extends reverse-bias lifetime under transient overvoltage and improves consistency of I_RM (≤0.5mA at 25°C), especially in noisy industrial power environments with frequent line spikes.

Can SB520-T replace a standard PN rectifier in an existing design?

Yes-if the circuit operates below 20V reverse bias and benefits from lower V_F. However, reverse leakage (0.5mA at 25°C) is higher than PN diodes, so verify that leakage current won't disrupt high-impedance feedback networks or standby power budgets in always-on systems.

SB520-T Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 20 V

Current - Average Rectified (Io):: 5A

Voltage - Forward (Vf) (Max) @ If:: 550 mV @ 5 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 500 µA @ 20 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

Operating Temperature - Junction:: -65°C ~ 125°C

SB520-T FAQ

1.How can I place an order for SB520-T through Aetrix?

Please submit a Request for Quotation (RFQ) for SB520-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 SB520-T reliable?

The price and inventory of SB520-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SB520-T is usually 5 days.

3.What payment methods are accepted for SB520-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SB520-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SB520-T?

SB520-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SB520-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 SB520-T?

For technical support, including SB520-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SB520-T requirements.

6.How does Aetrix verify that SB520-T is sourced from the original manufacturer or authorized distributors?

All SB520-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 SB520-T meets industry standards.

7.What is the process for return or replacement of SB520-T?

All SB520-T units undergo pre-shipment inspection (PSI). If there is an issue with SB520-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 SB520-T part is unused and in its original packaging.

Return procedure for SB520-T:

1.Submit a request within 90 days.

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

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