MMDT4126-7-F Equivalent & Substitute Parts

Part Overview

The MMDT4126-7-F is a dual PNP bipolar junction transistor array manufactured by Diodes Incorporated in a surface mount SOT-363 package. This component is classified as obsolete, indicating discontinued production and limited availability. The part operates at a maximum collector-emitter voltage of 25V with a collector current rating of 200mA and maximum power dissipation of 200mW. Due to its obsolete status, equivalent substitute parts with enhanced electrical specifications are available to maintain design continuity and ensure long-term component availability for new designs and production requirements.

Substiute Parts

MMDT4126-7-F

Diodes IncorporatedIn Stock: 2370MMDT4126-7-F Datasheet

Current PartRFQ

MMDT3906-7-F

Diodes IncorporatedIn Stock: 56146MMDT3906-7-F Datasheet

MFR RecommendedRFQ

MBT3906DW1T1G

onsemiIn Stock: 125391MBT3906DW1T1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMDT4126-7-F is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Transistor configuration: Dual PNP array maintained across all substitutes
• Collector current rating: 200mA maximum (identical across all parts)
• Transition frequency: 250MHz (identical across all parts)
• Vce saturation characteristics: 400mV @ 5mA, 50mA (identical across all parts)
• Operating temperature range: -55°C to 150°C (identical across all parts)

Mechanical Compatibility Criteria:

• Package type: SOT-363 / SC-88 / 6-TSSOP (identical across all parts)
• Mounting type: Surface mount (identical across all parts)
• Moisture sensitivity: MSL 1 (Unlimited) (identical across all parts)

Voltage Rating Enhancement: The substitute parts feature a maximum collector-emitter breakdown voltage of 40V, compared to the 25V rating of the MMDT4126-7-F. This represents an upward-compatible specification that allows operation in circuits designed for the original part while providing enhanced voltage margin for applications requiring higher voltage tolerance.

Product Status Consideration: The MMDT4126-7-F is obsolete. Both substitute parts are active products with confirmed inventory availability, ensuring long-term supply chain reliability.

Parameter Comparison

Engineering Selection Recommendations

MMDT3906-7-F (Diodes Incorporated): This substitute maintains identical power dissipation (200mW) and collector current specifications (200mA) while providing enhanced voltage rating (40V vs. 25V). The part is manufactured by the same supplier as the original component, ensuring consistent quality and process control. Active product status with 56,100 units in inventory provides reliable long-term availability. ROHS3 compliance and MSL 1 rating match the original specification. This part is suitable for direct replacement in applications where the enhanced voltage margin is beneficial or required.

MBT3906DW1T1G (onsemi): This substitute provides equivalent electrical performance with identical collector current (200mA), transition frequency (250MHz), and saturation characteristics. The enhanced voltage rating (40V) offers improved design margin. Power dissipation is rated at 150mW, which is lower than the original 200mW specification. This part is manufactured by onsemi and carries active product status with 125,300 units in inventory, ensuring superior supply chain availability. ROHS3 compliance and MSL 1 rating are maintained. Selection of this part is appropriate for applications where the 150mW power rating is sufficient and where onsemi supply chain relationships are preferred.

Product Status Justification: Both substitute parts are active products with confirmed inventory levels significantly exceeding the obsolete MMDT4126-7-F. This ensures component availability for current production and future design cycles. All parts maintain identical compliance certifications (ROHS3, REACH Unaffected, EAR99 ECCN classification).

Frequently Asked Questions (FAQ)

Q: Can the MMDT3906-7-F or MBT3906DW1T1G be used as direct replacements for the MMDT4126-7-F?

A: Both parts are electrically and mechanically compatible with the MMDT4126-7-F. The dual PNP transistor configuration, collector current rating (200mA), transition frequency (250MHz), saturation voltage characteristics, and operating temperature range are identical. The SOT-363 package and surface mount technology are unchanged. The primary difference is the enhanced collector-emitter breakdown voltage (40V vs. 25V), which represents an upward-compatible specification improvement.

Q: What is the significance of the voltage rating difference (25V vs. 40V)?

A: The MMDT4126-7-F operates at a maximum collector-emitter breakdown voltage of 25V. The substitute parts (MMDT3906-7-F and MBT3906DW1T1G) are rated for 40V. This means the substitute parts can operate safely in circuits with higher voltage levels. For circuits designed for the original 25V specification, the 40V-rated substitutes provide additional voltage margin and are fully compatible.

Q: Are there differences in DC current gain between the original and substitute parts?

A: The MMDT4126-7-F specifies a minimum DC current gain (hFE) of 120 @ 2mA, 1V. The substitute parts specify a minimum hFE of 100 @ 10mA, 1V. These measurements are taken at different operating points, making direct comparison impractical. Both specifications fall within typical ranges for dual PNP transistor arrays and are suitable for general-purpose switching and amplification applications.

Q: What is the difference in power dissipation between the MBT3906DW1T1G and the other parts?

A: The MMDT4126-7-F and MMDT3906-7-F are both rated for 200mW maximum power dissipation. The MBT3906DW1T1G is rated for 150mW. For applications operating below 150mW, all three parts are suitable. For applications requiring power dissipation between 150mW and 200mW, the MMDT3906-7-F is the appropriate choice.

Q: Are all three parts RoHS compliant?

A: Yes. The MMDT4126-7-F, MMDT3906-7-F, and MBT3906DW1T1G are all ROHS3 compliant. All parts carry MSL 1 (Unlimited) moisture sensitivity rating and are REACH Unaffected. These certifications are identical across all three parts.

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

A: For new designs, either the MMDT3906-7-F or MBT3906DW1T1G is appropriate. The MMDT3906-7-F maintains identical power dissipation (200mW) and is manufactured by Diodes Incorporated. The MBT3906DW1T1G is manufactured by onsemi and offers the highest inventory availability (125,300 units). Selection between these two parts depends on supplier preference, supply chain strategy, and specific application power requirements.

Q: Is the SOT-363 package identical across all three parts?

A: Yes. All three parts use the SOT-363 package, also designated as 6-TSSOP or SC-88. The physical dimensions, pin configuration, and surface mount characteristics are identical. No PCB layout modifications are required when substituting between these parts.

Q: What is the inventory status of each part?

A: The MMDT4126-7-F (obsolete) has 2,270 units in stock. The MMDT3906-7-F (active) has 56,100 units available. The MBT3906DW1T1G (active) has 125,300 units available. For long-term production requirements, the active parts provide superior supply chain reliability.