SR104-T Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR104-T is a 40V, 1A Schottky rectifier diode manufactured by Diodes Incorporated in DO-41 axial through-hole packaging. This component is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing design and production requirements. Schottky diodes in this voltage and current class are widely used in power supply circuits, reverse polarity protection, and high-frequency rectification applications where fast recovery characteristics are essential.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Maximum @ If	600 mV @ 1 A	mV @ A
Speed - Fast Recovery	≤ 500 ns, > 200 mA (Io)	ns
Current - Reverse Leakage @ Vr	1	mA @ 40 V
Capacitance @ Vr, F	110	pF @ 4V, 1MHz
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-65 to 150	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SR104-T is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) rating of 40V or higher
Current - Average Rectified (Io) rating of 1A or higher
Technology classification as Schottky
Mounting type as Through Hole
Package compatibility with DO-41 or DO-204AL axial configuration

Secondary Compatibility Factors:

Forward voltage (Vf) characteristics at rated current
Reverse leakage current specifications
Fast recovery speed classification (≤ 500 ns)
Operating temperature range encompassing the application environment
Regulatory compliance (RoHS3, REACH)

Substitute parts are grouped into two categories: Direct Electrical Equivalents (matching all primary parameters within specified tolerances) and Functional Alternatives (meeting primary criteria with minor parameter variations that do not compromise circuit performance).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) mV @ If	Reverse Leakage @ Vr	Capacitance pF @ 4V, 1MHz	Tj (°C)	Product Status	RoHS Status
SR104-T	Diodes Incorporated	40	1	600 @ 1 A	1 mA @ 40 V	110	-65 to 150	Obsolete	ROHS3 Compliant
1N5819-T	Diodes Incorporated	40	1	600 @ 1 A	1 mA @ 40 V	110	-65 to 125	Active	ROHS3 Compliant
SB140-T	Diodes Incorporated	40	1	500 @ 1 A	500 µA @ 40 V	—	-65 to 125	Active	ROHS3 Compliant
1N5819-AP	Micro Commercial Co	40	1	600 @ 1 A	1 mA @ 40 V	110	-55 to 125	Active	—
1N5819-BP	Micro Commercial Co	40	1	600 @ 1 A	1 mA @ 40 V	110	-55 to 125	Active	—
1N5819-TP	Micro Commercial Co	40	1	600 @ 1 A	1 mA @ 40 V	110	-55 to 125	Active	ROHS3 Compliant
1N5819	Microchip Technology	45	1	490 @ 1 A	50 µA @ 45 V	70	-65 to 125	Active	—
1N5819 B0G	Taiwan Semiconductor Corporation	40	1	600 @ 1 A	1 mA @ 40 V	55	-55 to 125	Active	ROHS3 Compliant
1N5819-1	Microchip Technology	45	1	340 @ 1 A	50 µA @ 45 V	70	-65 to 125	Active	RoHS non-compliant
1N5819-E3/53	Vishay General Semiconductor - Diodes Division	40	1	900 @ 3.1 A	1 mA @ 40 V	110	-65 to 125	Active	ROHS3 Compliant
1N5819-E3/54	Vishay General Semiconductor - Diodes Division	40	1	600 @ 1 A	1 mA @ 40 V	110	-65 to 125	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (Recommended Primary Substitutes):

1N5819-T (Diodes Incorporated), 1N5819-E3/54 (Vishay), and 1N5819 B0G (Taiwan Semiconductor Corporation) provide direct electrical equivalence to the SR104-T across all critical parameters. These parts maintain 40V reverse voltage rating, 1A average rectified current, 600 mV forward voltage at 1A, and 110 pF capacitance. All three are active products with ROHS3 compliance. The 1N5819-T offers the highest inventory availability (75,300 units) and identical temperature range to the original part (-65°C to 125°C). The 1N5819-E3/54 provides the largest stock (38,300 units) with established supply chain presence through Vishay distribution channels.

Tier 2 - Functional Alternatives (Secondary Substitutes):

1N5819-AP, 1N5819-BP, and 1N5819-TP (Micro Commercial Co) maintain electrical equivalence with identical voltage, current, and forward voltage specifications. These parts operate within a narrower temperature range (-55°C to 125°C), suitable for applications not requiring the full -65°C lower limit. The 1N5819-TP is ROHS3 compliant and available in cut tape packaging (2,099 units in stock).

SB140-T (Diodes Incorporated) operates at 40V/1A with improved forward voltage characteristics (500 mV versus 600 mV), resulting in lower power dissipation. Reverse leakage is higher at 500 µA, which may be acceptable in non-critical applications. This part is ROHS3 compliant and active.

Tier 3 - Enhanced Performance Alternatives:

1N5819 (Microchip Technology) and 1N5819-1 (Microchip Technology) provide 45V reverse voltage rating with superior reverse leakage characteristics (50 µA versus 1 mA). The 1N5819-1 exhibits significantly lower forward voltage (340 mV at 1A), reducing thermal dissipation. However, 1N5819-1 is RoHS non-compliant. The standard 1N5819 (Microchip) lacks RoHS certification data but offers 30,400 units in inventory.

Compliance Considerations:

For applications requiring ROHS3 compliance, select from: 1N5819-T, 1N5819-E3/54, SB140-T, 1N5819-TP, or 1N5819 B0G. All these parts carry explicit ROHS3 Compliant designation. Avoid 1N5819-1 (RoHS non-compliant) unless legacy system requirements mandate its use.

Temperature Range Considerations:

The original SR104-T operates to 150°C junction temperature. Most active substitutes limit operation to 125°C. For applications requiring the full 150°C capability, no direct substitute exists within the provided alternatives. Verify application maximum junction temperature requirements before selection.

Frequently Asked Questions (FAQ)

Q: Can 1N5819-T directly replace SR104-T in existing designs?

A: Yes. The 1N5819-T is a direct electrical equivalent with identical voltage (40V), current (1A), forward voltage (600 mV @ 1A), and capacitance (110 pF) specifications. Both use DO-41 axial through-hole packaging. The primary difference is product status (active versus obsolete) and operating temperature range (125°C versus 150°C maximum junction temperature). Verify that your application does not require operation above 125°C junction temperature.

Q: What is the difference between 1N5819-E3/54 and 1N5819-E3/53?

A: Both parts are manufactured by Vishay and share identical electrical ratings at the 1A operating point (40V, 1A, 600 mV forward voltage). The 1N5819-E3/53 specifies forward voltage at 3.1A (900 mV), indicating different characterization conditions. For 1A applications, both parts are functionally equivalent. The 1N5819-E3/54 has significantly higher inventory (38,300 units versus 9,777 units).

Q: Is SB140-T a suitable replacement for SR104-T?

A: SB140-T meets the primary substitution criteria (40V, 1A, DO-41 package, Schottky technology, fast recovery). It offers improved forward voltage performance (500 mV versus 600 mV at 1A), reducing power dissipation by approximately 17%. Reverse leakage is higher (500 µA versus 1 mA), which is acceptable in most rectification circuits. SB140-T is suitable for applications where lower forward voltage drop is beneficial and higher reverse leakage is tolerable.

Q: Why do some 1N5819 variants show 45V rating instead of 40V?

A: The 1N5819 base part number is manufactured by multiple suppliers with slight variations. Microchip Technology's 1N5819 and 1N5819-1 are rated at 45V reverse voltage, providing additional voltage margin. This higher rating does not prevent use in 40V applications; it simply indicates enhanced voltage capability. The 45V rating is a superset of the 40V requirement and is fully compatible.

Q: What packaging options are available for substitutes?

A: All listed substitutes maintain DO-41 axial through-hole packaging, ensuring mechanical compatibility with SR104-T footprints. Packaging variants include Cut Tape (CT) for automated assembly, Bulk for manual handling, and standard tape configurations. Select packaging based on assembly process requirements. For through-hole manual assembly or rework, any variant is acceptable.

Q: Are there temperature range limitations I should consider?

A: The original SR104-T operates to -65°C to 150°C junction temperature. Most active substitutes limit operation to -65°C to 125°C (Diodes Incorporated and Vishay parts) or -55°C to 125°C (Micro Commercial Co parts). If your application requires operation above 125°C junction temperature, no direct substitute exists in the provided list. Verify maximum junction temperature in your thermal analysis before part selection.

Q: Which substitute offers the best inventory availability?

A: The 1N5819-T (Diodes Incorporated) provides the highest inventory with 75,300 units in stock, followed by 1N5819-E3/54 (Vishay) with 38,300 units. Both are active products with ROHS3 compliance and identical electrical specifications to SR104-T at the 1A operating point. For immediate availability and supply chain continuity, 1N5819-T is the preferred selection.

Q: Can I use Microchip's 1N5819 in place of SR104-T?

A: Microchip's 1N5819 is functionally compatible with superior specifications: 45V reverse voltage (versus 40V), lower reverse leakage (50 µA versus 1 mA), and lower forward voltage (490 mV versus 600 mV at 1A). These improvements reduce power dissipation and provide additional voltage margin. However, RoHS compliance status is not specified for this part. Verify compliance requirements for your application before selection.

Q: What is the significance of the -E3/54 suffix on Vishay parts?

A: The -E3/54 suffix indicates Vishay's packaging and distribution code. The /54 designates the specific tape and reel configuration for automated assembly. The -E3 prefix indicates the product line variant. For electrical performance, 1N5819-E3/54 is identical to other 1N5819 variants from Vishay at the 1A operating point. The suffix does not affect substitution compatibility.

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