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

Taiwan Semiconductor Corporation SR004

Name: SR004
Brand: Taiwan Semiconductor Corporation
SKU: SR004
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SR004

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: SR004.pdf

Description:: DIODE SCHOTTKY 40V 500MA DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:4,247

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Product details

Overview

SR004 from Taiwan Semiconductor is a 40 V, 0.5 A Schottky barrier rectifier in DO-204AL (DO-41) package, featuring 0.55 V forward voltage at 0.5 A and 500 µA reverse leakage at 25°C, used in compact DC-DC converters and AC adapters requiring low-loss rectification.

For engineers reviewing the SR004 datasheet, SR004 pinout, SR004 application, or SR004 equivalent, key selection criteria include its 40 V repetitive peak reverse voltage, 30 A surge capability, 125°C max junction temperature, AEC-Q101 qualification option, and DO-41 mechanical compatibility with legacy through-hole power designs.

Technical Context

The SR004 operates as a single-die, unidirectional Schottky rectifier optimized for high-frequency switching applications. Its low VF (0.55 V typ.) and low CJ (110 pF) minimize conduction and capacitive losses, while the guard ring structure enhances transient overvoltage robustness without external snubbers.

Thermal performance is defined by R_θJA = 50°C/W in free-air conditions, supporting continuous 0.5 A operation up to 125°C junction temperature. Reverse leakage remains ≤500 µA at 25°C and ≤10 mA at 100°C, enabling stable performance across industrial ambient ranges.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in 36 V nominal DC bus or 28 V automotive systems
I_F	0.5 A - Continuous forward current rating; supports output stages in sub-10 W SMPS and USB-C PD adapters
V_F @ 0.5 A	0.55 V typ. - Low conduction loss reduces heat generation and improves efficiency in high-duty-cycle operation
I_R @ 25°C	500 µA max - Minimal leakage preserves standby power budget in always-on embedded power rails
I_FSM	30 A - Withstands 8.3 ms half-sine surge; accommodates inrush in offline input rectification
T_J max	125°C - Enables use in sealed enclosures or thermally constrained PCB layouts without forced cooling
C_J	110 pF @ 1 MHz, 4 V - Low junction capacitance minimizes switching noise and EMI in >100 kHz converters

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 (lead without band)	Forward current entry point	Connected to lower-potential side (e.g., transformer secondary center-tap or switch node return)
Cathode (lead with band)	Forward current exit / reverse blocking terminal	Connected to output rail or filter capacitor positive; blocks reverse voltage up to 40 V

Key Features

Feature	Design Value
Guard ring structure	Improves ruggedness against transient overvoltage events without requiring external clamping components
AEC-Q101 qualified version available	Validated for automotive under-hood environments including temperature cycling, humidity, and mechanical shock
RoHS and halogen-free compliance	Meets IEC 61249-2-21 and EU RoHS directives for environmentally regulated electronics manufacturing
UL 94V-0 molding compound	Provides flame-retardant encapsulation essential for safety-critical power supplies and industrial equipment

Applications

USB-C Power Adapter	Industrial PLC Power Module
Use Scenario: Secondary-side synchronous rectification in 20–30 W USB-C PD adapter with 5–20 V output range. IC Role / Device Role / Timing Role: Schottky rectifier replacing diode in flyback output stage to reduce conduction loss and improve thermal margin. Use Value: 0.55 V V_F cuts rectifier power loss by ~40% vs. standard silicon diode, enabling smaller heatsink and higher efficiency at full load.	Use Scenario: Input rectification for 24 V DC auxiliary supply in programmable logic controller backplane. IC Role / Device Role / Timing Role: Primary AC/DC front-end rectifier handling 120 VAC-derived 34 VDC bus with intermittent surges. Use Value: 30 A I_FSM withstands repeated motor-start transients; 125°C T_J rating ensures reliability in enclosed control cabinet environments.
Automotive Body Control Module	Medical Portable Monitor Power Supply
Use Scenario: Reverse polarity protection and load dump suppression in 12 V battery-fed body control unit. IC Role / Device Role / Timing Role: Cathode-connected to system rail, anode to battery input-functions as blocking diode during load dump events. Use Value: Guard ring design sustains 40 V reverse standoff during ISO 7637-2 pulse 5a (load dump), eliminating need for TVS augmentation.	Use Scenario: Output rectification in isolated 5 V/3.3 V dual-rail power supply for battery-powered patient monitor. IC Role / Device Role / Timing Role: Low-leakage (500 µA) Schottky rectifier minimizing standby current draw in sleep mode. Use Value: Sub-mA reverse current extends battery runtime in low-power monitoring states without compromising isolation integrity.

USB-C Power Adapter

Industrial PLC Power Module

Use Scenario: Secondary-side synchronous rectification in 20–30 W USB-C PD adapter with 5–20 V output range.

IC Role / Device Role / Timing Role: Schottky rectifier replacing diode in flyback output stage to reduce conduction loss and improve thermal margin.

Use Value: 0.55 V V_F cuts rectifier power loss by ~40% vs. standard silicon diode, enabling smaller heatsink and higher efficiency at full load.

Use Scenario: Input rectification for 24 V DC auxiliary supply in programmable logic controller backplane.

IC Role / Device Role / Timing Role: Primary AC/DC front-end rectifier handling 120 VAC-derived 34 VDC bus with intermittent surges.

Use Value: 30 A I_FSM withstands repeated motor-start transients; 125°C T_J rating ensures reliability in enclosed control cabinet environments.

Automotive Body Control Module

Medical Portable Monitor Power Supply

Use Scenario: Reverse polarity protection and load dump suppression in 12 V battery-fed body control unit.

IC Role / Device Role / Timing Role: Cathode-connected to system rail, anode to battery input-functions as blocking diode during load dump events.

Use Value: Guard ring design sustains 40 V reverse standoff during ISO 7637-2 pulse 5a (load dump), eliminating need for TVS augmentation.

Use Scenario: Output rectification in isolated 5 V/3.3 V dual-rail power supply for battery-powered patient monitor.

IC Role / Device Role / Timing Role: Low-leakage (500 µA) Schottky rectifier minimizing standby current draw in sleep mode.

Use Value: Sub-mA reverse current extends battery runtime in low-power monitoring states without compromising isolation integrity.

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-2EQH04-M3/54	Same 40 V V_RRM, 0.5 A I_F, but VF = 0.52 V typ. and CJ = 100 pF; DO-204AL package	Slightly lower VF improves efficiency marginally; tighter CJ tolerance aids EMI filtering predictability	Preferred where <0.53 V VF is required for thermal-limited designs; identical footprint enables drop-in replacement
ON Semiconductor SB0540	40 V V_RRM, 0.5 A I_F, VF = 0.54 V typ., IR = 100 µA max at 25°C; also DO-204AL	Lower leakage supports ultra-low-power standby; not AEC-Q101 qualified	Select when leakage <200 µA is critical and automotive qualification is unnecessary

Compared with SR004, VS-2EQH04-M3/54 offers marginally better conduction efficiency, while SB0540 delivers superior leakage performance at the expense of automotive qualification-both retain DO-41 compatibility but differ in reliability validation scope and thermal trade-offs.

Availability

SR004 is available at Aetrix Electronics and suitable for USB-C adapters, industrial PLC power modules, and automotive body control units requiring stable component supply with consistent parametric performance and long-term manufacturability.

Supply support for SR004 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 global industrial, computing, and automotive markets since 1979.

The SR002–SR010 series was designed specifically for cost-sensitive, high-volume power conversion applications demanding reliable Schottky performance in standardized through-hole packages with extended thermal and surge robustness.

FAQ

What is the maximum junction temperature rating for SR004?

The SR004 has a maximum junction temperature (T_J) rating of +125°C under continuous operation. This allows reliable use in enclosed power supplies and automotive under-dash environments where ambient temperatures may reach 85°C, provided thermal design maintains junction temperature within this limit using the specified R_θJA = 50°C/W.

Is SR004 AEC-Q101 qualified?

The base SR004 part is not automatically AEC-Q101 qualified; however, the SR004H variant-identifiable by the "H" suffix in the ordering code-is fully AEC-Q101 qualified. Engineers must specify SR004H for automotive applications requiring stress-tested reliability per the AEC standard.

What does the marking "SR004" on the device body indicate?

The marking "SR004" on the SR004 device body identifies the exact part number and confirms it belongs to the 40 V V_RRM variant within the SR002–SR010 Schottky rectifier family. It is laser-marked on the cathode-banded end of the DO-41 package per standard TSC marking conventions.

Can SR004 replace a standard silicon rectifier like 1N4004?

Yes, SR004 can replace 1N4004 in many low-current applications due to its identical DO-41 package and 40 V rating, but with significantly lower forward voltage (0.55 V vs. ~0.9 V) and faster recovery. However, SR004's higher reverse leakage requires verification in high-impedance or precision bias networks where 1N4004's <5 µA leakage may be preferred.

What is the typical junction capacitance of SR004 and why does it matter?

The SR004 exhibits a typical junction capacitance (C_J) of 110 pF at 1 MHz and 4.0 V reverse bias. This value directly impacts high-frequency switching noise and EMI generation in DC-DC converters; lower C_J reduces capacitive coupling into sensitive control circuits and eases EMI filter design compared to higher-capacitance alternatives.

SR004 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):: 500mA

Voltage - Forward (Vf) (Max) @ If:: 550 mV @ 500 mA

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 500 µA @ 40 V

Capacitance @ Vr, F:: 110pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AL (DO-41)

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

SR004 FAQ

1.How can I place an order for SR004 through Aetrix?

Please submit a Request for Quotation (RFQ) for SR004 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 SR004 reliable?

The price and inventory of SR004 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR004 is usually 5 days.

3.What payment methods are accepted for SR004?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR004 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SR004?

SR004 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SR004 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 SR004?

For technical support, including SR004 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR004 requirements.

6.How does Aetrix verify that SR004 is sourced from the original manufacturer or authorized distributors?

All SR004 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 SR004 meets industry standards.

7.What is the process for return or replacement of SR004?

All SR004 units undergo pre-shipment inspection (PSI). If there is an issue with SR004, 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 SR004 part is unused and in its original packaging.

Return procedure for SR004:

1.Submit a request within 90 days.

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

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