SR104 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR104 is an active-status Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40V DC reverse voltage and 1A average rectified current in a DO-204AL (DO-41) through-hole axial package. This component is designed for fast-recovery applications with switching speeds ≤500ns at currents >200mA. The SR104 is ROHS3 compliant and REACH unaffected, with unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified to address packaging format variations (Tape & Reel versus Cut Tape), manufacturer availability, and inventory requirements while maintaining electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Max	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Max @ If	550 mV @ 1 A	mV
Speed - Fast Recovery	≤500ns, >200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 40V
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SR104 are classified into three categories based on electrical parameter alignment and packaging format:

Parametric Equivalent (Identical Electrical Specifications): Parts with matching voltage rating (40V), current rating (1A), forward voltage (550 mV @ 1A), reverse leakage (500 µA @ 40V), and fast-recovery speed characteristics. These parts differ only in packaging format (Cut Tape versus Tape & Reel).

Direct Manufacturer Equivalents (Minor Parameter Variance): Parts with voltage ratings at or above 40V, matching 1A current rating, and fast-recovery speed ≤500ns. Forward voltage and reverse leakage may vary within acceptable operating ranges. Package format is DO-41 or DO-204AL axial configuration.

Similar Alternatives (Functional Compatibility): Parts meeting the core electrical requirements (40V minimum reverse voltage, 1A current rating, fast-recovery Schottky technology, through-hole axial mounting) with acceptable parameter tolerances for general rectification applications.

Key parameters determining substitution eligibility:

Voltage - DC Reverse (Vr) ≥ 40V
Current - Average Rectified (Io) = 1A
Technology = Schottky
Speed = Fast Recovery ≤500ns, >200mA
Mounting Type = Through Hole
Package = DO-204AL, DO-41, or DO-204AC axial configuration

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) mV	Ir @ Vr (µA)	Package	Tj (°C)	RoHS
SR104	Taiwan Semiconductor Corporation	40	1	550 @ 1A	500 @ 40V	DO-204AL (DO-41)	-55 to 125	ROHS3
SR104 A0G	Taiwan Semiconductor Corporation	40	1	550 @ 1A	500 @ 40V	DO-204AL (DO-41)	-55 to 125	ROHS3
1N5819	Microchip Technology	45	1	490 @ 1A	50 @ 45V	DO-204AL (DO-41)	-65 to 125	—
1N5819RL	STMicroelectronics	40	1	550 @ 1A	500 @ 40V	DO-204AL (DO-41)	-65 to 150	ROHS3
SB140	Fairchild Semiconductor	40	1	500 @ 1A	500 @ 40V	DO-204AC (DO-15)	-50 to 150	—
SB140-T	Diodes Incorporated	40	1	500 @ 1A	500 @ 40V	DO-204AL (DO-41)	-65 to 125	ROHS3
SB140E-G	Comchip Technology	40	1	500 @ 1A	500 @ 40V	DO-204AL (DO-41)	-65 to 125	ROHS3
10DQ04	SMC Diode Solutions	40	1	550 @ 1A	500 @ 40V	DO-204AL (DO-41)	-65 to 125	ROHS3
1N5819-E3/53	Vishay General Semiconductor - Diodes Division	40	1	900 @ 3.1A	1000 @ 40V	DO-204AL (DO-41)	-65 to 125	ROHS3
1N5819-E3/54	Vishay General Semiconductor - Diodes Division	40	1	600 @ 1A	1000 @ 40V	DO-204AL (DO-41)	-65 to 125	ROHS3
1N5819-E3/73	Vishay General Semiconductor - Diodes Division	40	1	600 @ 1A	1000 @ 40V	DO-204AL (DO-41)	-65 to 125	ROHS3

Engineering Selection Recommendations

Parametric Equivalent Selection: SR104 A0G is the direct parametric equivalent, differing only in packaging format (Cut Tape instead of Tape & Reel). This part maintains identical electrical specifications and compliance certifications. Selection is appropriate when Cut Tape packaging is acceptable for assembly processes.

Direct Manufacturer Equivalent Selection: 1N5819 (Microchip Technology) and 1N5819RL (STMicroelectronics) are direct equivalents with enhanced voltage ratings (45V and 40V respectively) and improved reverse leakage characteristics. Both maintain 1A current rating and fast-recovery Schottky technology. 1N5819RL offers extended maximum junction temperature (150°C) and ROHS3 compliance, suitable for high-temperature applications.

Compatible Alternative Selection: SB140-T (Diodes Incorporated) and SB140E-G (Comchip Technology) provide functional compatibility with identical 40V/1A ratings, DO-41 axial packaging, and ROHS3 compliance. Forward voltage is reduced to 500 mV, offering improved efficiency. Both support extended operating temperature ranges (-65°C to 125°C).

Package Format Consideration: SB140 (Fairchild Semiconductor) uses DO-204AC (DO-15) package instead of DO-204AL (DO-41). While electrically compatible, physical dimensions differ. This part is suitable only when DO-15 package footprint is acceptable in the application circuit.

Inventory and Availability: 1N5819-E3/54 (Vishay) offers the highest inventory availability (38,300 units) with ROHS3 compliance and -65°C to 125°C operating range. Forward voltage specification at 1A (600 mV) is within acceptable tolerance for general rectification applications.

Compliance Verification: All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the SR104 regulatory profile. MSL 1 (Unlimited) moisture sensitivity is consistent across parametric equivalents and direct alternatives.

Frequently Asked Questions (FAQ)

Q: Can SR104 A0G be used as a direct replacement for SR104?

A: Yes. SR104 A0G is a parametric equivalent with identical electrical specifications (40V, 1A, 550 mV forward voltage, 500 µA reverse leakage). The only difference is packaging format: SR104 A0G is supplied in Cut Tape (CT) format while SR104 is supplied in Tape & Reel (TR) format. Both are ROHS3 compliant with MSL 1 rating.

Q: What is the primary difference between SR104 and 1N5819?

A: The 1N5819 (Microchip Technology) has a higher reverse voltage rating (45V versus 40V) and significantly lower reverse leakage current (50 µA @ 45V versus 500 µA @ 40V). Forward voltage is also lower (490 mV @ 1A versus 550 mV @ 1A). These characteristics make 1N5819 suitable for applications requiring lower leakage and improved efficiency, though it is not ROHS3 certified.

Q: Is SB140 compatible with SR104 in all applications?

A: SB140 is electrically compatible (40V, 1A, Schottky technology) but uses a different package format: DO-204AC (DO-15) instead of DO-204AL (DO-41). Physical dimensions and PCB footprints differ. SB140 is suitable only when the DO-15 package footprint is acceptable in the circuit design.

Q: Why do some substitute parts show higher reverse leakage current?

A: Reverse leakage current (Ir) varies among manufacturers and production batches. Parts such as 1N5819-E3/53, 1N5819-E3/54, and 1N5819-E3/73 show 1 mA @ 40V leakage compared to SR104's 500 µA @ 40V. This difference remains within acceptable operating ranges for general rectification applications but may affect performance in precision analog circuits requiring minimal leakage.

Q: Can I substitute SR104 with 10DQ04?

A: Yes. 10DQ04 (SMC Diode Solutions) meets all electrical requirements: 40V reverse voltage, 1A current rating, fast-recovery Schottky technology, and DO-41 axial package. It is ROHS3 compliant with -65°C to 125°C operating range. Note that 10DQ04 is REACH Affected, whereas SR104 is REACH Unaffected. Verify REACH compliance requirements for your application before selection.

Q: What is the advantage of using 1N5819RL over SR104?

A: 1N5819RL (STMicroelectronics) offers three advantages: (1) extended maximum junction temperature to 150°C, suitable for high-temperature environments; (2) identical electrical specifications at 40V/1A with 550 mV forward voltage; (3) ROHS3 compliance matching SR104. Operating temperature range extends to -65°C, providing wider thermal operating window.

Q: Are all substitute parts available in the same packaging options?

A: No. Most substitutes are available in Cut Tape (CT) format. SR104 is supplied in Tape & Reel (TR) format. SR104 A0G provides the same part in Cut Tape format. Verify packaging format requirements for your assembly process before part selection.

Q: Which substitute offers the best efficiency for low-power applications?

A: 1N5819 (Microchip Technology) offers the lowest forward voltage (490 mV @ 1A) and lowest reverse leakage (50 µA @ 45V), making it optimal for efficiency-critical applications. SB140-T and SB140E-G also provide reduced forward voltage (500 mV @ 1A) compared to SR104 (550 mV @ 1A).

Q: Is temperature range a critical factor in selecting a substitute?

A: Temperature range becomes critical only if your application operates outside SR104's specified range (-55°C to 125°C). Substitutes such as 1N5819RL (-65°C to 150°C), SB140-T (-65°C to 125°C), and SB140E-G (-65°C to 125°C) provide extended ranges. For standard industrial applications within -55°C to 125°C, all listed substitutes are acceptable.

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