SR310 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR310 is an active-status Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 100V DC reverse voltage and 3A average rectified current in a through-hole DO-201AD axial package. This component is designed for fast-recovery rectification applications requiring low forward voltage drop and rapid switching characteristics. Equivalent and substitute parts are identified based on matching or exceeding the electrical specifications and mechanical compatibility of the original SR310 design.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	100	µA @ 100 V
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SR310 are classified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Equal to or greater than 100V
Current - Average Rectified (Io): Equal to or greater than 3A
Technology: Schottky
Mounting Type: Through Hole
Package / Case: DO-201AD or compatible DO-201 variant
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Direct Equivalents maintain identical or superior electrical ratings with compatible packaging. Similar Substitutes meet the core electrical requirements but may have variations in forward voltage, reverse leakage current, or current capacity that remain within acceptable operating parameters for the SR310 application.

Parameter Comparison

Parameter	SR310 (Main)	SB3100	SB3100-T	SB5100-T	31DQ10
Manufacturer	Taiwan Semiconductor Corporation	Diotec Semiconductor	Diodes Incorporated	Diodes Incorporated	SMC Diode Solutions
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	3 A	3 A	3 A	5 A	3.3 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A	780 mV @ 3 A	790 mV @ 3 A	800 mV @ 5 A	850 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 100 V	600 µA @ 100 V	500 µA @ 100 V	500 µA @ 100 V	1 mA @ 100 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-201AD, Axial	DO-201AA, DO-27, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Operating Temperature - Junction	-55°C ~ 150°C	-50°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-40°C ~ 150°C
Technology	Schottky	Schottky	Schottky	Schottky	Schottky
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

SB3100-T (Diodes Incorporated) is the primary direct equivalent for the SR310. This part maintains identical voltage and current ratings (100V, 3A), operates across an extended temperature range (-65°C to 150°C), and is packaged in DO-201AD format. The SB3100-T exhibits lower forward voltage (790 mV vs. 850 mV) and is ROHS3 compliant with REACH Unaffected status. This substitute is suitable for direct replacement in applications where the SR310 is currently specified.

SB3100 (Diotec Semiconductor) provides equivalent electrical performance with 100V and 3A ratings. Forward voltage is reduced to 780 mV, offering improved efficiency. The part is available in DO-201AA and DO-27 packages in addition to axial configuration. Operating temperature range is -50°C to 150°C. ROHS3 compliance is confirmed; REACH status requires verification upon request. This substitute is compatible with SR310 applications requiring standard through-hole mounting.

31DQ10 (SMC Diode Solutions) exceeds the SR310 specifications with a 3.3A current rating while maintaining 100V reverse voltage. Forward voltage matches the SR310 at 850 mV @ 3A. The part includes specified capacitance (110pF @ 5V, 1MHz) and operates from -40°C to 150°C. ROHS3 compliance and REACH Affected status are documented. This substitute is applicable where higher current margin is required.

SB5100-T (Diodes Incorporated) provides increased current capacity at 5A while maintaining 100V reverse voltage, suitable for applications requiring higher current handling. Forward voltage is 800 mV @ 5A. Operating temperature extends to -65°C. ROHS3 compliant with REACH Unaffected status. This substitute is selected when the SR310 current rating is insufficient for the application.

All substitute parts maintain Schottky technology, fast-recovery characteristics, and through-hole mounting compatibility with the SR310. Selection is based on application requirements for current capacity, temperature range, and forward voltage performance.

Frequently Asked Questions (FAQ)

Q: Can the SB3100-T directly replace the SR310 in existing circuit designs?

A: Yes. The SB3100-T maintains identical voltage (100V) and current (3A) ratings as the SR310 and is packaged in the same DO-201AD axial format. Both parts are ROHS3 compliant and operate across overlapping temperature ranges. Direct substitution is supported without circuit modification.

Q: What is the difference between SB3100 and SB3100-T?

A: Both parts are manufactured by Diodes Incorporated with identical electrical specifications (100V, 3A). The primary difference is packaging: SB3100-T is supplied in Cut Tape (CT) format, while SB3100 packaging is not specified. SB3100 is available in multiple package options including DO-201AA and DO-27 variants. Forward voltage performance is comparable (780 mV vs. 790 mV).

Q: When should the 31DQ10 be selected over the SR310?

A: The 31DQ10 is selected when the application requires higher current capacity (3.3A vs. 3A) or when specified capacitance characteristics (110pF @ 5V, 1MHz) are required. The 31DQ10 maintains 100V reverse voltage and DO-201AD packaging compatibility. Operating temperature range is -40°C to 150°C, which may be limiting in extreme cold environments compared to the SR310 (-55°C minimum).

Q: Is the SB5100-T suitable for applications designed for the SR310?

A: The SB5100-T is suitable when the application requires higher current capacity (5A vs. 3A) or when design margins for current handling are necessary. The part maintains 100V reverse voltage and DO-201AD packaging. Forward voltage is slightly higher (800 mV @ 5A). The SB5100-T is not required for applications where the SR310 current rating is adequate.

Q: What compliance certifications are consistent across all substitute parts?

A: All substitute parts (SB3100, SB3100-T, SB5100-T, 31DQ10) are ROHS3 compliant. REACH status varies: SB3100-T, SB5100-T, and SR310 are REACH Unaffected; SB3100 requires verification upon request; 31DQ10 is REACH Affected. All parts carry EAR99 ECCN classification where specified.

Q: Are there package compatibility considerations when substituting the SR310?

A: The SR310 is specified in DO-201AD axial package. All primary substitutes (SB3100-T, SB5100-T, 31DQ10) are available in DO-201AD format. SB3100 offers additional package options (DO-201AA, DO-27) but maintains axial configuration. Mechanical fit and PCB layout compatibility are preserved across all recommended substitutes.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage variations among substitutes range from 780 mV (SB3100) to 850 mV (SR310, 31DQ10). Lower forward voltage reduces power dissipation and heat generation. In rectification applications, this difference typically results in improved efficiency. Circuit design should account for forward voltage when precision voltage regulation is required, though the variation is generally acceptable in standard rectifier applications.

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

A: Reverse leakage current varies from 100 µA (SR310) to 1 mA (31DQ10) at 100V. Higher leakage increases standby power consumption and heat generation. The SR310 exhibits the lowest leakage. For applications sensitive to leakage current, SB3100-T or SB5100-T (500 µA) provide acceptable performance. The 31DQ10 (1 mA) is suitable for applications where leakage is not a critical parameter.

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