MMBT3904M-TP Equivalent & Substitute Parts

Part Overview

The MMBT3904M-TP is a surface mount NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This device operates at a maximum collector current of 200 mA with a collector-emitter breakdown voltage of 40 V and a maximum power dissipation of 100 mW. The part is classified as obsolete, necessitating identification of active equivalent alternatives to ensure continued design support and procurement availability. Substitute parts must maintain electrical compatibility across critical parameters including collector current rating, breakdown voltage, and saturation characteristics while accommodating different package configurations.

Substiute Parts

MMBT3904M-TP

Micro Commercial CoIn Stock: 1232MMBT3904M-TP Datasheet

Current PartRFQ

MMBT3904L3-TP

Micro Commercial CoIn Stock: 1050MMBT3904L3-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMBT3904M-TP is determined by strict equivalence across the following critical electrical parameters:

• Transistor Type: NPN configuration required for functional compatibility
• Collector Current Rating (Ic Max): 200 mA minimum to support existing circuit current demands
• Collector-Emitter Breakdown Voltage (Vce(BR)CEO): 40 V minimum to maintain voltage margin in the application
• Power Dissipation (Pmax): Minimum 100 mW to accommodate thermal requirements
• Mounting Type: Surface mount technology for PCB assembly compatibility
• Base Product Number: MMBT3904 series designation ensures electrical equivalence within the manufacturer's product line

The MMBT3904L3-TP qualifies as a direct substitute based on matching all critical electrical parameters. While the substitute part features a different package configuration (DFN1006-3 versus SOT-883) and increased power rating (150 mW versus 100 mW), these differences represent design improvements that maintain backward compatibility. The substitute part carries active product status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

The MMBT3904L3-TP is the qualified substitute for the obsolete MMBT3904M-TP based on the following engineering criteria:

Electrical Equivalence: Both parts maintain identical collector current (200 mA), collector-emitter breakdown voltage (40 V), and base product designation (MMBT3904). These parameters ensure functional interchangeability in switching and amplification circuits.

Compliance Enhancement: The substitute part carries ROHS3 compliance status, representing an advancement over the original RoHS Compliant designation. This upgrade ensures compatibility with current regulatory requirements and procurement standards.

Product Status: The MMBT3904L3-TP holds active product status, guaranteeing ongoing manufacturer support, documented availability, and supply chain reliability. The obsolete status of the main part necessitates transition to this active alternative.

Power Rating Advantage: The substitute part provides 150 mW maximum power dissipation compared to 100 mW in the original part. This increased thermal capability provides design margin without requiring circuit modification.

Package Consideration: The substitute employs a DFN1006-3 package versus the SOT-883 package of the main part. PCB layout modifications are required to accommodate the different package footprint. Both packages are surface mount configurations with MSL 1 rating, maintaining equivalent moisture handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the MMBT3904L3-TP directly replace the MMBT3904M-TP without circuit modification?

A: Electrical substitution is direct based on matching collector current, breakdown voltage, and base product designation. However, package geometry differs (DFN1006-3 versus SOT-883), requiring PCB footprint redesign. Circuit functionality remains unchanged.

Q: What is the significance of the increased power rating (150 mW versus 100 mW) in the substitute part?

A: The higher power rating provides additional thermal margin in the application. Circuits designed for the 100 mW specification operate within the 150 mW capability of the substitute part, ensuring safe operation with reduced thermal stress.

Q: Are there any compliance differences between the main part and substitute?

A: The substitute part carries ROHS3 compliance, which supersedes the RoHS Compliant designation of the original part. Both parts maintain MSL 1 (Unlimited) moisture sensitivity rating. The upgrade in compliance status supports current procurement and regulatory requirements.

Q: Why is the MMBT3904M-TP classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production and support. The MMBT3904L3-TP represents the active continuation within the MMBT3904 product family, ensuring design continuity and supply availability.

Q: What parameters must remain constant for substitution to be valid?

A: Collector current (200 mA), collector-emitter breakdown voltage (40 V), transistor type (NPN), and base product number (MMBT3904) are the critical parameters determining substitution validity. These parameters ensure functional equivalence in the application circuit.

Q: Does the package change affect electrical performance?

A: Package geometry does not alter electrical performance characteristics. Both SOT-883 and DFN1006-3 packages provide equivalent electrical functionality. The package change requires only PCB layout modification, not circuit redesign.