SR108-TP Schottky Diode 80V 1A DO-41 Equivalent & Substitute Parts

Part Overview

The SR108-TP is a through-hole Schottky diode rated for 80V DC reverse voltage and 1A average rectified current, housed in a DO-41 package. This component is classified as "Not For New Designs" by the manufacturer, Micro Commercial Co. The obsolescence status of the SR108-TP necessitates identification of equivalent substitute parts that maintain electrical and mechanical compatibility for existing applications and legacy system support.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	80	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 80 V
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-55°C ~ 125°C	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the SR108-TP is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 80V minimum
Current - Average Rectified (Io): 1A minimum
Technology: Schottky
Mounting Type: Through Hole
Package / Case: DO-41 or DO-204AL (equivalent axial packages)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Within acceptable operating range
Current - Reverse Leakage @ Vr: Acceptable for application requirements
Operating Temperature Range: Sufficient for intended thermal environment

All identified substitute parts meet or exceed the primary substitution criteria. Variations in forward voltage drop, reverse leakage current, and operating temperature range are documented to enable informed selection based on specific application requirements.

Parameter Comparison

Parameter	SR108-TP (Main)	1N6760	DSB1A80	SB180-T
Manufacturer	Micro Commercial Co	Microchip Technology	Microchip Technology	Diodes Incorporated
Voltage - DC Reverse (Vr) (Max)	80 V	80 V	80 V	80 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 1 A	690 mV @ 1 A	690 mV @ 1 A	800 mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 80 V	100 µA @ 80 V	100 µA @ 80 V	500 µA @ 80 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Operating Temperature - Junction	-55°C ~ 125°C	-65°C ~ 150°C	Not specified	-65°C ~ 125°C
Product Status	Not For New Designs	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

SR108-TP Substitution Priority:

Tier 1 - Preferred Substitutes (Active Status, Full Compliance):

The SB180-T (Diodes Incorporated) is the primary recommended substitute. This part maintains ROHS3 compliance matching the original SR108-TP, operates across the same temperature range (-65°C ~ 125°C), and is in active production status. The SB180-T is supplied in Cut Tape (CT) packaging with 21,120 units in stock, ensuring availability. Forward voltage drop is 800 mV @ 1A, within 50 mV of the original specification, and reverse leakage current matches the SR108-TP at 500 µA @ 80V.

Tier 2 - Functional Equivalents (Active Status, Compliance Variance):

The 1N6760 (Microchip Technology) and DSB1A80 (Microchip Technology) are functionally equivalent substitutes with identical electrical ratings (80V, 1A, Fast Recovery). Both parts are in active production. However, both are RoHS non-compliant, which may restrict use in applications requiring RoHS3 certification. The 1N6760 offers superior reverse leakage performance (100 µA @ 80V versus 500 µA) and extended operating temperature range (-65°C ~ 150°C). The DSB1A80 is supplied in DO-204AL package variant with 1,009 units in stock.

Compliance Considerations:

Applications requiring ROHS3 compliance must select either SB180-T or SR108-TP. Legacy systems or applications without RoHS restrictions may utilize 1N6760 or DSB1A80 based on thermal and leakage current requirements.

Frequently Asked Questions (FAQ)

Q: Can the SR108-TP be directly replaced with any of the listed substitutes?

A: All listed substitutes (1N6760, DSB1A80, SB180-T) are electrically and mechanically compatible with the SR108-TP. All parts share identical voltage ratings (80V), current ratings (1A), package types (DO-41/DO-204AL), and fast recovery speed classification. Direct pin-for-pin substitution is supported without circuit modification.

Q: What is the difference between the 1N6760 and DSB1A80?

A: The 1N6760 and DSB1A80 are both manufactured by Microchip Technology and share identical electrical specifications (80V, 1A, 690 mV forward voltage, 100 µA reverse leakage). The primary difference is packaging: 1N6760 is supplied in Bulk packaging, while DSB1A80 is supplied in DO-204AL package variant. Both are RoHS non-compliant.

Q: Why does the SB180-T have higher forward voltage (800 mV) compared to the Microchip alternatives (690 mV)?

A: Forward voltage variation within the specified range reflects manufacturing process differences between Diodes Incorporated and Microchip Technology. The SB180-T specification of 800 mV @ 1A remains within acceptable operating parameters and is only 50 mV higher than the original SR108-TP (850 mV). This difference has minimal impact on circuit performance in typical rectification applications.

Q: Which substitute should be selected for RoHS3-compliant applications?

A: The SB180-T is the only active-status substitute that maintains ROHS3 compliance. The original SR108-TP is also ROHS3 compliant but is classified as "Not For New Designs." For new designs or applications requiring RoHS3 certification, SB180-T is the specified selection.

Q: What is the significance of reverse leakage current differences between substitutes?

A: The SR108-TP and SB180-T specify 500 µA @ 80V reverse leakage, while the 1N6760 and DSB1A80 specify 100 µA @ 80V. Lower reverse leakage reduces standby current consumption and heat generation in applications with sustained reverse bias. Selection depends on application sensitivity to leakage current; both specifications are acceptable for standard rectification circuits.

Q: Are there packaging differences that affect PCB layout or assembly?

A: All substitutes use through-hole axial packages (DO-41 or DO-204AL equivalent). These packages are mechanically and dimensionally compatible. The primary packaging difference is supplier format: SR108-TP is supplied in Tape & Reel (TR), 1N6760 in Bulk, DSB1A80 in DO-204AL variant, and SB180-T in Cut Tape (CT). These differences affect procurement and assembly processes but not PCB layout or component functionality.

Q: What is the operating temperature range consideration for substitute selection?

A: The SR108-TP operates from -55°C to 125°C. The SB180-T matches this range (-65°C ~ 125°C with extended lower limit). The 1N6760 offers extended range (-65°C ~ 150°C), and DSB1A80 does not specify operating temperature. For applications operating near thermal limits, the 1N6760 provides additional margin. For standard industrial applications, all substitutes are thermally adequate.

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