MMSD301T1 Schottky Diode Equivalent & Substitute Parts

Part Overview

The MMSD301T1 is an obsolete Schottky diode manufactured by onsemi, rated for 30V DC reverse voltage with 225mW power dissipation in SOD-123 surface mount packaging. This component is classified as RoHS non-compliant and is no longer in active production. Due to its obsolete status, equivalent substitute parts are necessary for new designs, repairs, and production continuity. Suitable alternatives must maintain electrical compatibility within the 30V reverse voltage specification while accommodating modern RoHS3 compliance requirements.

Substiute Parts

MMSD301T1

onsemiIn Stock: 4508MMSD301T1 Datasheet

Current PartRFQ

MMSD301T1G

onsemiIn Stock: 505118MMSD301T1G Datasheet

DirectRFQ

PMEG3005EH,115

Nexperia USA Inc.In Stock: 6221PMEG3005EH,115 Datasheet

SimilarRFQ

SD101CW-E3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 18682SD101CW-E3-08 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MMSD301T1 is determined by the following mandatory parameters:

Critical Electrical Parameters:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 30V
• Technology: Must be Schottky diode type
• Current rating: Must support the application's forward current requirements

Critical Mechanical Parameters:

• Package / Case: SOD-123 or compatible surface mount package
• Mounting Type: Surface mount configuration

Compliance Parameters:

• RoHS Status: Active substitutes must be RoHS3 compliant
• Moisture Sensitivity Level: MSL 1 (Unlimited) preferred for handling compatibility
• REACH Status: REACH Unaffected status maintained across all substitutes

The three substitute parts listed below meet these criteria with varying current ratings and forward voltage characteristics, allowing selection based on specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

MMSD301T1G (onsemi)

The MMSD301T1G is the direct manufacturer equivalent from onsemi. It maintains the same 30V reverse voltage rating and SOD-123 package footprint as the obsolete MMSD301T1. This part is RoHS3 compliant and carries Active product status. The 200mA current rating and 600mV forward voltage at 10mA provide baseline performance for low-to-moderate current applications. This substitute is recommended for designs requiring minimal component qualification changes and direct footprint compatibility.

PMEG3005EH,115 (Nexperia USA Inc.)

The PMEG3005EH,115 maintains the 30V reverse voltage specification but is packaged in SOD-123F, a variant of the SOD-123 family. This part supports higher current levels at 500mA with superior forward voltage characteristics (430mV @ 500mA). The maximum junction temperature of 150°C exceeds the MMSD301T1G specification. This substitute is suitable for applications requiring higher current capacity and improved thermal performance. PCB layout verification is necessary to confirm SOD-123F package compatibility with existing SOD-123 footprints.

SD101CW-E3-08 (Vishay General Semiconductor - Diodes Division)

The SD101CW-E3-08 provides a 40V reverse voltage rating, exceeding the 30V requirement of the MMSD301T1. This part is rated for 30mA average rectified current in SOD-123 packaging. The higher reverse voltage rating provides additional design margin for transient overvoltage conditions. This substitute is appropriate for applications where reverse voltage margin is prioritized and current requirements do not exceed 30mA. The 900mV forward voltage at 15mA is higher than alternatives and should be evaluated for power dissipation impact.

Compliance Considerations

All three substitute parts are RoHS3 compliant and REACH Unaffected, addressing the non-compliance status of the obsolete MMSD301T1. All maintain MSL 1 (Unlimited) moisture sensitivity classification, preserving handling and storage procedures.

Frequently Asked Questions (FAQ)

Q: Can MMSD301T1G directly replace MMSD301T1 without PCB modifications?

A: Yes. The MMSD301T1G maintains identical SOD-123 package geometry, 30V reverse voltage rating, and Schottky technology. Direct footprint substitution is supported without PCB layout changes.

Q: What is the difference between SOD-123 and SOD-123F packages?

A: SOD-123F is a variant of the SOD-123 family with identical lead pitch and footprint compatibility in most applications. The PMEG3005EH,115 in SOD-123F can be mounted on standard SOD-123 pads. Physical dimensions should be verified against PCB design files to confirm clearance compatibility.

Q: Why does SD101CW-E3-08 have a 40V rating when the original part is 30V?

A: The SD101CW-E3-08 is rated for 40V maximum reverse voltage, which exceeds the 30V requirement. This higher rating provides additional safety margin against transient overvoltage events. The part remains suitable for 30V applications as long as the 30mA current rating meets circuit requirements.

Q: Which substitute should be selected for new production designs?

A: Selection depends on current requirements. For applications requiring 200mA or less, MMSD301T1G is the direct equivalent. For applications requiring up to 500mA, PMEG3005EH,115 is appropriate. For applications requiring 30mA or less with enhanced reverse voltage margin, SD101CW-E3-08 is suitable. All three are RoHS3 compliant and recommended for new designs.

Q: Are there thermal performance differences between substitutes?

A: Yes. The PMEG3005EH,115 specifies a maximum junction temperature of 150°C, compared to 125°C for MMSD301T1G and SD101CW-E3-08. The PMEG3005EH,115 also exhibits lower forward voltage (430mV @ 500mA), resulting in reduced power dissipation at higher currents. Thermal analysis should be performed for applications operating near maximum junction temperature limits.

Q: What is the impact of forward voltage differences on circuit performance?

A: Forward voltage variations affect voltage drop across the diode and power dissipation. The PMEG3005EH,115 at 430mV @ 500mA provides the lowest forward voltage, minimizing power loss in high-current applications. The SD101CW-E3-08 at 900mV @ 15mA exhibits higher forward voltage and is suitable only for low-current circuits where this voltage drop is acceptable.

Q: Are all substitutes available in the same packaging format?

A: MMSD301T1G and SD101CW-E3-08 are available in SOD-123 packaging. The PMEG3005EH,115 is available in SOD-123F. Packaging availability may vary by supplier and order quantity. Verify packaging options with component distributors for specific procurement requirements.