MBR3100 Equivalent & Substitute Parts

Part Overview

The MBR3100 is a Schottky rectifier diode rated for 100 V DC reverse voltage and 3 A average rectified current in a through-hole axial package (DO-201AA/DO-27). This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The MBR3100 is manufactured by onsemi and features fast recovery characteristics suitable for rectification applications requiring low forward voltage drop and rapid switching response.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	790 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	600	µA @ 100 V
Mounting Type	Through Hole	—
Package / Case	DO-201AA, DO-27, Axial	—
Operating Temperature - Junction	-65°C ~ 175°C	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the MBR3100 is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 100 V minimum
Current - Average Rectified (Io): 3 A minimum
Technology: Schottky
Mounting Type: Through Hole
Package / Case: DO-201 series or Axial compatible

Secondary Compatibility Factors:

Forward voltage drop (Vf) within acceptable operating range
Fast recovery speed characteristic (≤ 500ns, > 200mA)
Reverse leakage current performance
Operating temperature range coverage

Substitute parts are grouped into two categories:

Direct Equivalents (3 A rated current): Parts with identical 3 A current rating and 100 V voltage rating, maintaining the same electrical performance envelope as the MBR3100.

Higher Current Alternatives (12 A rated current): Parts with 12 A current rating and 100 V voltage rating, suitable for applications where the MBR3100 is used but higher current capacity is available or required.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Product Status	RoHS Status
MBR3100	onsemi	100 V	3	790 mV @ 3 A	600 µA @ 100 V	DO-201AA, DO-27, Axial	Obsolete	RoHS non-compliant
SB3100	Diotec Semiconductor	100 V	3	780 mV @ 3 A	600 µA @ 100 V	DO-201AA, DO-27, Axial	Active	ROHS3 Compliant
31DQ10	SMC Diode Solutions	100 V	3.3	850 mV @ 3 A	1 mA @ 100 V	DO-201AD, Axial	Active	ROHS3 Compliant
SB12100-AP	Micro Commercial Co	100 V	12	850 mV @ 12 A	500 µA @ 100 V	DO-201AD, Axial	Active	Not specified
SB12100-BP	Micro Commercial Co	100 V	12	850 mV @ 12 A	500 µA @ 100 V	DO-201AD, Axial	Active	Not specified
SB12100-TP	Micro Commercial Co	100 V	12	850 mV @ 12 A	500 µA @ 100 V	DO-201AD, Axial	Active	Not specified
SB3100-T	Diodes Incorporated	100 V	3	790 mV @ 3 A	500 µA @ 100 V	DO-201AD, Axial	Active	ROHS3 Compliant
SB3100E-G	Comchip Technology	100 V	3	850 mV @ 3 A	500 µA @ 100 V	DO-201AD, Axial	Active	ROHS3 Compliant
SB3H100-E3/73	Vishay General Semiconductor - Diodes Division	100 V	3	800 mV @ 3 A	20 µA @ 100 V	DO-201AD, Axial	Active	ROHS3 Compliant
SR3010-AP	Micro Commercial Co	100 V	3	850 mV @ 3 A	1 mA @ 100 V	DO-201AD, Axial	Active	Not specified
SR3010-BP	Micro Commercial Co	100 V	3	850 mV @ 3 A	1 mA @ 100 V	DO-201AD, Axial	Active	Not specified

Engineering Selection Recommendations

For Direct Replacement (Equivalent Performance):

SB3100-T (Diodes Incorporated) and SB3100 (Diotec Semiconductor) are the primary direct equivalents to the MBR3100. Both parts maintain the 100 V / 3 A electrical specification with forward voltage characteristics within 10 mV of the original device. Both are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain stability. SB3100-T offers superior compliance documentation and is available in cut tape packaging.

SB3H100-E3/73 (Vishay General Semiconductor - Diodes Division) provides an alternative with notably lower reverse leakage current (20 µA versus 600 µA), beneficial for applications sensitive to leakage performance. This part is ROHS3 compliant and actively produced.

For Applications Requiring Higher Current Capacity:

SB12100-AP, SB12100-BP, and SB12100-TP (all Micro Commercial Co) provide 12 A current rating at 100 V, suitable for designs where the MBR3100 is used but higher current handling is available or required. These parts maintain the same voltage rating and fast recovery characteristics. Inventory availability is confirmed for all three variants.

For Marginal Current Increase:

31DQ10 (SMC Diode Solutions) offers 3.3 A current rating, providing a modest increase over the 3 A specification while maintaining 100 V voltage rating. This part is ROHS3 compliant and actively produced.

Compliance Considerations:

The MBR3100 is RoHS non-compliant. All recommended direct equivalents (SB3100, SB3100-T, SB3H100-E3/73, SB3100E-G, 31DQ10) are ROHS3 compliant, supporting modern manufacturing and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can SB3100-T directly replace MBR3100 in existing designs?

A: Yes. SB3100-T meets all electrical specifications of the MBR3100: 100 V reverse voltage, 3 A average rectified current, fast recovery Schottky technology, and through-hole axial package compatibility. Forward voltage is identical at 790 mV @ 3 A. The part is actively produced and ROHS3 compliant.

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

A: Both parts are electrically equivalent with identical 100 V / 3 A ratings and 780-790 mV forward voltage. SB3100-T is supplied in cut tape packaging by Diodes Incorporated, while SB3100 is supplied by Diotec Semiconductor. Selection depends on packaging requirements and supplier preference.

Q: Can I use SB12100-TP instead of MBR3100?

A: SB12100-TP is electrically compatible with the MBR3100 in terms of voltage rating (100 V) and package type (DO-201AD axial). However, it is rated for 12 A average rectified current versus the MBR3100's 3 A rating. This part is suitable for applications where higher current capacity is beneficial or required, but it is not necessary for circuits designed for 3 A operation.

Q: What is the significance of the lower reverse leakage in SB3H100-E3/73?

A: SB3H100-E3/73 exhibits reverse leakage of 20 µA @ 100 V compared to 600 µA in the MBR3100. Lower reverse leakage reduces standby current consumption and heat generation in applications sensitive to leakage performance. This characteristic makes SB3H100-E3/73 preferable for precision rectification circuits or low-power applications.

Q: Are all substitute parts available in the same package as MBR3100?

A: All substitute parts are available in through-hole axial packages compatible with MBR3100 mounting. The MBR3100 uses DO-201AA/DO-27 packaging. Substitute parts use DO-201AD or equivalent axial packages, which are mechanically and electrically compatible with the original package footprint.

Q: Which substitute part has the best RoHS compliance status?

A: All recommended direct equivalents (SB3100, SB3100-T, SB3H100-E3/73, SB3100E-G, 31DQ10) are ROHS3 compliant. The MBR3100 is RoHS non-compliant. Selection of any active substitute part ensures compliance with modern environmental and manufacturing standards.

Q: Can SR3010-BP be used as a substitute?

A: SR3010-BP meets the 100 V / 3 A electrical specification and is available in through-hole axial package. However, it exhibits higher reverse leakage (1 mA @ 100 V) and operates at a lower maximum junction temperature (-55°C ~ 125°C) compared to the MBR3100 (-65°C ~ 175°C). This part is suitable for applications within its temperature range but may not be optimal for high-temperature environments.

Q: What is the primary reason to select SB3100 over other equivalents?

A: SB3100 (Diotec Semiconductor) provides the closest electrical match to MBR3100 with forward voltage of 780 mV @ 3 A and reverse leakage of 600 µA @ 100 V. It is actively produced, ROHS3 compliant, and offers high inventory availability (77,600 pcs). Selection depends on supplier preference and packaging requirements.

Q: Are there temperature range differences between MBR3100 and its substitutes?

A: Yes. The MBR3100 operates from -65°C to 175°C. Most substitutes operate within -40°C to 150°C or -55°C to 125°C ranges. SB3H100-E3/73 specifies a maximum junction temperature of 175°C, matching the MBR3100. For applications requiring the full -65°C to 175°C range, SB3H100-E3/73 or SB3100-T are recommended.

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