MMBTA13-7 NPN Darlington Transistor Equivalent & Substitute Parts

Part Overview

The MMBTA13-7 is an NPN Darlington bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-23-3 package. This device is rated for 30 V collector-emitter breakdown voltage with a maximum collector current of 300 mA and 300 mW power dissipation. The part is qualified to AEC-Q101 automotive standards and operates across a temperature range of -55°C to 150°C.

The MMBTA13-7 is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain electrical and mechanical compatibility with existing designs. Substitute parts must satisfy the same functional requirements while meeting current product availability and compliance standards.

Substiute Parts

MMBTA13-7

Diodes IncorporatedIn Stock: 1203MMBTA13-7 Datasheet

Current PartRFQ

MMBTA13-7-F

Diodes IncorporatedIn Stock: 15405MMBTA13-7-F Datasheet

Parametric EquivalentRFQ

SMMBTA13LT1G

onsemiIn Stock: 21485SMMBTA13LT1G Datasheet

DirectRFQ

2SD2142KT146

Rohm SemiconductorIn Stock: 191142SD2142KT146 Datasheet

MFR RecommendedRFQ

MMBTA13-TP

Micro Commercial CoIn Stock: 45575MMBTA13-TP Datasheet

MFR RecommendedRFQ

MMBTA14-TP

Micro Commercial CoIn Stock: 4111MMBTA14-TP Datasheet

MFR RecommendedRFQ

MMBTA14LT1G

onsemiIn Stock: 125375MMBTA14LT1G Datasheet

MFR RecommendedRFQ

PMBTA13,215

Nexperia USA Inc.In Stock: 1962PMBTA13,215 Datasheet

MFR RecommendedRFQ

PMBTA14,215

NXP SemiconductorsIn Stock: 99844PMBTA14,215 Datasheet

MFR RecommendedRFQ

SMMBTA14LT1G

onsemiIn Stock: 15490SMMBTA14LT1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMBTA13-7 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Transistor type: NPN - Darlington configuration
• Collector current rating: 300 mA minimum
• Collector-emitter breakdown voltage: 30 V minimum
• Vce saturation: 1.5 V @ 100 µA, 100 mA
• Collector cutoff current: 100 nA maximum
• DC current gain (hFE): 10000 minimum @ specified conditions
• Transition frequency: 125 MHz minimum
• Power dissipation: 300 mW minimum

Mechanical Equivalence Criteria:

• Package: SOT-23-3 (TO-236-3, SC-59) surface mount
• Mounting type: Surface mount
• Moisture sensitivity: MSL 1 (Unlimited)
• Pin configuration: Three-terminal (base, collector, emitter)

Compliance Criteria:

• RoHS compliance status
• REACH compliance status
• Automotive grade and AEC-Q101 qualification where applicable

Substitute parts are grouped into two categories: direct parametric equivalents that match all electrical specifications, and functional equivalents that satisfy the core electrical requirements while offering enhanced performance characteristics or improved product availability.

Parameter Comparison

Engineering Selection Recommendations

Direct Parametric Equivalent (Recommended Primary Substitute):

MMBTA13-7-F (Diodes Incorporated) is the direct equivalent to the MMBTA13-7. This part maintains identical electrical specifications including 300 mA collector current, 30 V breakdown voltage, 10000 hFE minimum, and 300 mW power dissipation. The primary distinction is product status: MMBTA13-7-F is active with 15356 units in stock, whereas the original MMBTA13-7 is discontinued. MMBTA13-7-F is ROHS3 compliant, addressing regulatory requirements not met by the original part. Packaging is identical SOT-23-3 surface mount. This substitution requires no circuit redesign.

Alternative Equivalents with Reduced Power Dissipation:

SMMBTA13LT1G (onsemi), MMBTA13-TP (Micro Commercial Co), and 2SD2142KT146 (Rohm Semiconductor) satisfy all core electrical requirements with reduced maximum power dissipation (225 mW or 200 mW versus 300 mW). These parts are suitable for applications where the original 300 mW specification provides design margin. All three are active products with ROHS3 compliance. SMMBTA13LT1G and MMBTA13-TP maintain the -55°C to 150°C operating range; 2SD2142KT146 specifies 150°C maximum junction temperature without lower limit documentation.

Higher Current Gain Alternatives:

MMBTA14-TP (Micro Commercial Co), MMBTA14LT1G (onsemi), and SMMBTA14LT1G (onsemi) provide doubled DC current gain (20000 hFE minimum) while maintaining all other electrical parameters. These parts are suitable for applications requiring enhanced current amplification. All are active with ROHS3 compliance and -55°C to 150°C operating range.

Extended Current Rating Options:

PMBTA13,215 (Nexperia USA Inc.) and PMBTA14,215 (NXP Semiconductors) are rated for 500 mA collector current versus 300 mA, providing increased current handling capacity within the same SOT-23-3 package. Both maintain 30 V breakdown voltage and are AEC-Q101 qualified automotive grade. PMBTA13,215 matches the original 10000 hFE specification; PMBTA14,215 provides 20000 hFE. These parts are suitable for designs requiring higher current capability without package change.

Product Availability and Compliance:

All recommended substitutes are active products with ROHS3 compliance and MSL 1 moisture sensitivity rating. Inventory levels range from 1937 to 125300 units across the substitute options, ensuring supply chain continuity. Selection should prioritize MMBTA13-7-F for direct replacement, with alternative selections based on specific application requirements for power dissipation, current gain, or current rating.

Frequently Asked Questions (FAQ)

Q: Can MMBTA13-7-F be used as a direct replacement for MMBTA13-7?

A: Yes. MMBTA13-7-F is electrically and mechanically identical to MMBTA13-7, with identical ratings for collector current (300 mA), breakdown voltage (30 V), current gain (10000 hFE minimum), and power dissipation (300 mW). The primary difference is product status: MMBTA13-7-F is active and ROHS3 compliant. No circuit modifications are required.

Q: What is the difference between MMBTA13 and MMBTA14 series parts?

A: The MMBTA13 and MMBTA14 series differ in DC current gain specification. MMBTA13 parts specify 10000 hFE minimum, while MMBTA14 parts specify 20000 hFE minimum. All other electrical parameters including collector current (300 mA), breakdown voltage (30 V), and power dissipation remain equivalent. Selection depends on application requirements for current amplification.

Q: Are PMBTA13,215 and PMBTA14,215 compatible with MMBTA13-7 designs?

A: PMBTA13,215 and PMBTA14,215 are mechanically compatible (SOT-23-3 package) and electrically compatible for voltage and frequency specifications. However, these parts are rated for 500 mA collector current versus 300 mA for MMBTA13-7. They are suitable substitutes for applications where higher current capability is beneficial or required. Power dissipation is 250 mW versus 300 mW for the original part.

Q: What is the significance of the -7-F suffix in MMBTA13-7-F?

A: The -7-F designation indicates the specific product variant and packaging configuration from Diodes Incorporated. The -F suffix denotes Tape & Reel (TR) packaging format. This is a standard manufacturer designation and does not affect electrical compatibility with the original MMBTA13-7.

Q: Can I use SMMBTA13LT1G or SMMBTA14LT1G as substitutes?

A: Yes. Both SMMBTA13LT1G and SMMBTA14LT1G are onsemi products in SOT-23-3 packages with identical electrical specifications to their non-S counterparts. The S prefix indicates automotive-grade qualification. Both maintain the -55°C to 150°C operating range and are ROHS3 compliant. Selection between SMMBTA13LT1G (10000 hFE) and SMMBTA14LT1G (20000 hFE) depends on current gain requirements.

Q: What are the packaging differences among substitute options?

A: All substitute parts listed are surface mount devices in SOT-23-3 (TO-236-3, SC-59) packages, maintaining mechanical compatibility with MMBTA13-7. Packaging format variations include Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, and Bulk configurations. These format differences affect procurement and handling but do not impact electrical performance or circuit compatibility.

Q: Is RoHS compliance important for MMBTA13-7 substitution?

A: The original MMBTA13-7 is RoHS non-compliant. All active substitute parts listed are ROHS3 compliant, meeting current regulatory requirements for lead-free and restricted substance compliance. For applications subject to RoHS regulations, ROHS3-compliant substitutes are required. MMBTA13-7-F is the recommended choice for direct replacement with improved compliance status.

Q: Can 2SD2142KT146 replace MMBTA13-7 in all applications?

A: 2SD2142KT146 satisfies core electrical requirements with equivalent collector current (300 mA), breakdown voltage (30 V), and current gain (10000 hFE). However, it specifies 200 MHz transition frequency versus 125 MHz for MMBTA13-7, and 200 mW power dissipation versus 300 mW. It is suitable for applications where these specifications provide adequate performance margin. The operating temperature range is -55°C to 150°C, matching the original part.

Q: What factors should determine my choice among the substitute options?

A: Selection should be based on: (1) product availability and supply chain requirements, (2) RoHS and regulatory compliance status, (3) required DC current gain (10000 hFE for MMBTA13 series, 20000 hFE for MMBTA14 series), (4) maximum collector current requirement (300 mA for standard parts, 500 mA for PMBTA series), (5) power dissipation margin needed in the application, and (6) automotive qualification requirements (AEC-Q101 for Nexperia and NXP parts). MMBTA13-7-F is recommended as the primary substitute for direct replacement.