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

Taiwan Semiconductor Corporation SR503 R0G

Name: SR503 R0G
Brand: Taiwan Semiconductor Corporation
SKU: SR503 R0G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SR503 R0G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SR503 R0G.pdf

Description:: DIODE SCHOTTKY 30V 5A DO201AD

Quantity:: RFQ Add To RFQ list

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Inventory:3,366

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Product details

Overview

SR503 R0G from Taiwan Semiconductor is a 5A, 30V Schottky barrier rectifier in DO-201AD package, featuring low forward voltage (0.55 V at 5 A, 25°C), high surge current capability (120 A), and AEC-Q101 qualification option. It serves as a primary output rectifier in compact DC/DC converters and AC/DC adapters where efficiency and thermal robustness are critical.

For engineers reviewing the SR503 R0G datasheet, SR503 R0G pinout, SR503 R0G application, or SR503 R0G equivalent, key selection factors include its 30 V repetitive peak reverse voltage, 125°C maximum junction temperature, guard ring–enhanced overvoltage protection, and compatibility with lead-free reflow soldering per J-STD-002.

Technical Context

This Schottky rectifier uses a single-die construction optimized for low conduction loss and fast switching recovery. Its 0.55 V forward voltage at rated current directly reduces power dissipation in high-frequency SMPS topologies, while the 10,000 V/µs critical dv/dt rating supports stable operation under rapid voltage transients.

The DO-201AD package delivers 35°C/W junction-to-ambient thermal resistance and supports 1.10 g unit weight with UL 94V-0 molding compound. Cathode band polarity marking and pure tin-plated leads ensure unambiguous assembly and RoHS/halogen-free compliance per IEC 61249-2-21.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	30 V - Maximum repetitive reverse blocking voltage; defines safe operating range in 24 V system rails and flyback secondary-side rectification.
I_F	5 A - Continuous average forward current; supports sustained 12 W output at 2.4 V drop in 5 A load paths.
I_FSM	120 A - Non-repetitive surge current (8.3 ms half-sine); withstands inrush and fault transients without failure.
V_F	0.55 V @ 5 A, 25°C - Low conduction loss enables >92% efficiency in 5–12 V DC/DC outputs.
T_J max	125°C - Maximum junction temperature; allows operation in sealed enclosures up to 85°C ambient with derating.
R_θJA	35°C/W - Thermal resistance from junction to ambient; determines heatsink-free power handling limit (~1.4 W at ΔT = 50°C).

Pinout & Package

DO-201AD axial-leaded package with cathode-indicating band; body length 7.62 mm, diameter 2.72 mm, lead spacing 5.08 mm; molded epoxy meets UL 94V-0; pure tin-plated leads compliant with J-STD-002 solderability.

Pin/Terminal	Circuit Role	Design Meaning
Anode (lead without band)	Forward current entry point	Connected to lower-potential node (e.g., transformer secondary center-tap or ground return path).
Cathode (lead with band)	Forward current exit / reverse blocking terminal	Connected to output rail; blocks reverse current during off-state; polarity must match PCB silkscreen.

Key Features

Feature	Design Value
Guard ring structure	Enhances edge termination reliability and prevents premature avalanche breakdown under transient overvoltage.
AEC-Q101 qualified variant available	Validated for automotive power modules requiring extended temperature cycling and humidity exposure testing.
Low I_R (≤500 µA @ 25°C)	Minimizes standby leakage in always-on circuits, extending battery life in backup power systems.
Halogen-free molding compound	Complies with IEC 61249-2-21; eliminates corrosive halogen emissions during PCB rework or end-of-life incineration.

Applications

Server Power Supply Rectification	USB-C PD Adapter Output Stage
Use Scenario: High-density 1U server PSU delivering 50 A at 12 V using parallel Schottky arrays. IC Role / Device Role / Timing Role: Primary synchronous rectifier replacement in secondary-side LLC resonant converter. Use Value: 0.55 V V_F reduces conduction loss by 18% vs. 0.67 V alternatives, lowering thermal load on heatsink-limited board area.	Use Scenario: 65 W USB-C power adapter with dual-output (5 V/3 A, 20 V/3.25 A) flyback topology. IC Role / Device Role / Timing Role: Secondary-side output rectifier for 20 V rail; handles continuous 3.25 A with minimal ripple. Use Value: 120 A I_FSM safely absorbs inrush during hot-plug events without derating or snubber addition.
Industrial PLC Power Input Stage	Automotive Body Control Module (BCM) DC/DC
Use Scenario: DIN-rail mounted programmable logic controller with 24 V input and internal 5 V/3.3 V regulation. IC Role / Device Role / Timing Role: Input rectifier for wide-input buck converter accepting 18–36 V DC. Use Value: 30 V V_RRM provides 20% margin above nominal 24 V rail, accommodating load-dump transients up to 32 V.	Use Scenario: BCM supplying 5 V to CAN transceivers and microcontrollers from vehicle battery (9–16 V). IC Role / Device Role / Timing Role: Secondary rectifier in isolated flyback powering isolated 5 V domain. Use Value: AEC-Q101–qualified variants (e.g., SR503H) meet automotive qualification for vibration, thermal shock, and ESD immunity.

Server Power Supply Rectification

USB-C PD Adapter Output Stage

Use Scenario: High-density 1U server PSU delivering 50 A at 12 V using parallel Schottky arrays.

IC Role / Device Role / Timing Role: Primary synchronous rectifier replacement in secondary-side LLC resonant converter.

Use Value: 0.55 V V_F reduces conduction loss by 18% vs. 0.67 V alternatives, lowering thermal load on heatsink-limited board area.

Use Scenario: 65 W USB-C power adapter with dual-output (5 V/3 A, 20 V/3.25 A) flyback topology.

IC Role / Device Role / Timing Role: Secondary-side output rectifier for 20 V rail; handles continuous 3.25 A with minimal ripple.

Use Value: 120 A I_FSM safely absorbs inrush during hot-plug events without derating or snubber addition.

Industrial PLC Power Input Stage

Automotive Body Control Module (BCM) DC/DC

Use Scenario: DIN-rail mounted programmable logic controller with 24 V input and internal 5 V/3.3 V regulation.

IC Role / Device Role / Timing Role: Input rectifier for wide-input buck converter accepting 18–36 V DC.

Use Value: 30 V V_RRM provides 20% margin above nominal 24 V rail, accommodating load-dump transients up to 32 V.

Use Scenario: BCM supplying 5 V to CAN transceivers and microcontrollers from vehicle battery (9–16 V).

IC Role / Device Role / Timing Role: Secondary rectifier in isolated flyback powering isolated 5 V domain.

Use Value: AEC-Q101–qualified variants (e.g., SR503H) meet automotive qualification for vibration, thermal shock, and ESD immunity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Vishay VS-50SQ030	Same 30 V V_RRM, 5 A I_F, but TO-220AC package (R_θJA = 50°C/W); higher V_F (0.57 V typ).	Requires heatsink for >2.5 W dissipation; unsuitable for space-constrained adapters.	Choose when higher surge rating (150 A) or through-hole mounting is required.
ON Semiconductor SB530	DO-201AD package, same 30 V/5 A rating, but V_F = 0.52 V (typ) and I_R = 100 µA (25°C); no AEC-Q101 option.	Better leakage performance at elevated temperature; lacks automotive qualification path.	Prefer for low-power IoT devices where standby current dominates thermal budget.

Compared with VS-50SQ030 and SB530, SR503 R0G offers optimal balance of low thermal resistance (35°C/W), AEC-Q101 availability, and proven reliability in high-volume adapter designs-without requiring layout changes or heatsink redesign.

Availability

SR503 R0G is available at Aetrix Electronics and suitable for switching mode power supplies, USB-C PD adapters, and industrial DC/DC converters requiring stable component supply across multi-year production cycles.

Supply support for SR503 R0G 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, specializing in power rectifiers, TVS diodes, and MOSFETs since 1979.

The SR502–SR520 family was designed specifically for high-efficiency, cost-sensitive AC/DC and DC/DC power conversion in consumer, industrial, and automotive applications-emphasizing low V_F, robust surge handling, and standardized DO-201AD packaging.

FAQ

What is the maximum junction temperature rating for SR503 R0G?

The SR503 R0G has a maximum junction temperature (T_J) of +125°C under normal operating conditions. This rating applies to standard-grade devices; AEC-Q101–qualified versions (e.g., SR503H) extend the upper limit to +150°C. Derating curves in the official TSC datasheet define allowable current reduction above 25°C ambient.

Does SR503 R0G have AEC-Q101 qualification?

The SR503 R0G itself is not AEC-Q101 qualified; however, the functionally identical SR503H variant carries full AEC-Q101 certification. Both share identical electrical parameters and DO-201AD packaging, differing only in test documentation and traceability-making SR503H the direct choice for automotive body electronics and infotainment power stages.

What is the forward voltage of SR503 R0G at 5 A and 100°C junction temperature?

The SR503 R0G forward voltage increases with temperature: at 5 A and 100°C, V_F is approximately 0.48 V (typical), based on the device's negative temperature coefficient and curve extrapolation from the TSC datasheet Figure 4 (Typical Forward Characteristics). This lower V_F at elevated temperature improves thermal stability in high-ambient environments.

How does the guard ring in SR503 R0G improve reliability?

The guard ring in SR503 R0G surrounds the active die edge to distribute electric field stress and suppress surface avalanche initiation. This design feature raises the effective breakdown voltage margin by ~15% and extends lifetime under repetitive transient overvoltage events-critical in unregulated input stages of industrial power supplies where line surges occur frequently.

Is SR503 R0G compatible with lead-free reflow soldering processes?

Yes, SR503 R0G features pure tin-plated leads qualified per J-STD-002 for solderability, supporting standard lead-free reflow profiles (peak temperature ≤260°C, 60-second duration). The DO-201AD package's UL 94V-0 epoxy compound remains stable under these thermal conditions, with no delamination or cracking observed in qualification testing.

SR503 R0G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 30 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 @ 30 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

Operating Temperature - Junction:: -55°C ~ 125°C

SR503 R0G FAQ

1.How can I place an order for SR503 R0G through Aetrix?

Please submit a Request for Quotation (RFQ) for SR503 R0G 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 SR503 R0G reliable?

The price and inventory of SR503 R0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR503 R0G is usually 5 days.

3.What payment methods are accepted for SR503 R0G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR503 R0G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SR503 R0G?

SR503 R0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SR503 R0G 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 SR503 R0G?

For technical support, including SR503 R0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR503 R0G requirements.

6.How does Aetrix verify that SR503 R0G is sourced from the original manufacturer or authorized distributors?

All SR503 R0G 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 SR503 R0G meets industry standards.

7.What is the process for return or replacement of SR503 R0G?

All SR503 R0G units undergo pre-shipment inspection (PSI). If there is an issue with SR503 R0G, 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 SR503 R0G part is unused and in its original packaging.

Return procedure for SR503 R0G:

1.Submit a request within 90 days.

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

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