MMST4124-7 Equivalent & Substitute Parts

Part Overview

The MMST4124-7 is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This device is classified as an active product with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). The MMST4124-7 is packaged in SC70-3 configuration with Cut Tape and Digi-Reel® options available.

Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and regulatory compliance. Substitute devices must maintain functional equivalence within the specified electrical parameters to ensure direct replacement capability in circuit applications.

Substiute Parts

MMST4124-7

Diodes IncorporatedIn Stock: 1137MMST4124-7 Datasheet

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CMPT3904G TR PBFREE

Central Semiconductor CorpIn Stock: 2448CMPT3904G TR PBFREE Datasheet

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PMST3904,135

Nexperia USA Inc.In Stock: 9594PMST3904,135 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MMST4124-7 are identified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

• Transistor Type: NPN configuration
• Current Rating: Maximum collector current of 0.2 A (200 mA) or greater
• Voltage Rating: Collector-emitter breakdown voltage of 25 V or greater
• Mounting Type: Surface mount technology
• Regulatory Compliance: RoHS3 compliant, REACH unaffected status
• Moisture Sensitivity: MSL 1 rating

Identified Substitute Parts:

1. CMPT3904G TR PBFREE (Central Semiconductor Corp) - SOT23 package
2. PMST3904,135 (Nexperia USA Inc.) - SOT-323 package

Both substitute devices meet or exceed the electrical specifications of the MMST4124-7 while maintaining full regulatory compliance. Package differences (SC70-3 versus SOT23/SOT-323) require physical layout verification for PCB compatibility.

Parameter Comparison

Engineering Selection Recommendations

CMPT3904G TR PBFREE Selection: This substitute is suitable for applications where the SC70-3 to SOT-23 package transition is acceptable. The device provides higher voltage rating (40 V versus 25 V) and maintains identical current specifications. RoHS3 compliance and unlimited MSL rating ensure compatibility with standard manufacturing and storage requirements. Tape & Reel packaging supports automated assembly processes.

PMST3904,135 Selection: This substitute offers the highest voltage margin (40 V) and includes automotive-grade qualification (AEC-Q101) with SOT-323 packaging. The reduced power rating (200 mW versus 350 mW for CMPT3904G) requires verification against circuit power dissipation requirements. This device is appropriate for applications requiring automotive-grade reliability or where SOT-323 package dimensions are preferred. RoHS3 compliance and unlimited MSL rating are maintained.

Regulatory Compliance: All identified substitutes maintain ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the MMST4124-7. No additional compliance verification is required for standard commercial applications.

Frequently Asked Questions (FAQ)

Q: Can CMPT3904G TR PBFREE directly replace MMST4124-7 on the PCB?

A: Electrical substitution is valid. Physical replacement requires PCB layout modification due to package differences (SC70-3 versus SOT-23). Pin configuration and footprint dimensions differ and must be verified against schematic requirements.

Q: What is the primary difference between CMPT3904G TR PBFREE and PMST3904,135?

A: Both devices meet the electrical requirements of the MMST4124-7. The primary differences are package type (SOT-23 versus SOT-323), power rating (350 mW versus 200 mW), and automotive qualification (PMST3904,135 includes AEC-Q101). Selection depends on package space constraints and application requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. CMPT3904G TR PBFREE and PMST3904,135 are both RoHS3 compliant with REACH unaffected status, matching the compliance profile of the MMST4124-7.

Q: What does MSL 1 (Unlimited) mean for storage and handling?

A: MSL 1 rating indicates unlimited shelf life without moisture bake-out requirements. All three devices (MMST4124-7, CMPT3904G TR PBFREE, and PMST3904,135) share this rating, eliminating moisture sensitivity as a substitution constraint.

Q: Can PMST3904,135 be used in non-automotive applications?

A: Yes. Automotive-grade qualification (AEC-Q101) indicates enhanced reliability testing and is suitable for general-purpose applications. The device is not restricted to automotive use.

Q: How do voltage ratings affect substitution?

A: The MMST4124-7 has a 25 V collector-emitter breakdown rating. Both substitutes (CMPT3904G TR PBFREE and PMST3904,135) have 40 V ratings, providing higher voltage margin. This allows substitution in circuits operating at or below 25 V without derating concerns.

Q: What packaging options are available for each substitute?

A: CMPT3904G TR PBFREE is supplied in Tape & Reel (TR) format. PMST3904,135 is also supplied in Tape & Reel (TR) format. Both support automated assembly processes. The MMST4124-7 is available in Cut Tape (CT) and Digi-Reel® options.