MMSTA14-7-F Equivalent & Substitute Parts

Part Overview

The MMSTA14-7-F is an NPN Darlington bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-323 package. This component operates at a maximum collector current of 300 mA with a collector-emitter breakdown voltage of 30 V and a maximum power dissipation of 200 mW. The part is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified to address supply chain requirements, inventory availability, or specific application constraints while maintaining functional compatibility within the defined electrical and mechanical parameters.

Substiute Parts

MMSTA14-7-F

Diodes IncorporatedIn Stock: 6376MMSTA14-7-F Datasheet

Current PartRFQ

MMSTA14-7

Diodes IncorporatedIn Stock: 3818MMSTA14-7 Datasheet

Parametric EquivalentRFQ

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

PMBTA14,215

NXP SemiconductorsIn Stock: 99844PMBTA14,215 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MMSTA14-7-F are qualified based on the following critical parameters that determine functional compatibility:

Electrical Parameters (Must Match or Exceed):

• Transistor Type: NPN - Darlington
• Current - Collector (Ic) (Max): 300 mA minimum
• Voltage - Collector Emitter Breakdown (Max): 30 V minimum
• Vce Saturation (Max) @ Ib, Ic: 1.5V @ 100µA, 100mA
• Current - Collector Cutoff (Max): 100 nA maximum
• Power - Max: 200 mW minimum
• Frequency - Transition: 125 MHz minimum
• Operating Temperature Range: Must include -55°C to 150°C or equivalent maximum

Mechanical Parameters (Must Be Compatible):

• Mounting Type: Surface Mount
• Package / Case: SOT-323 or equivalent footprint-compatible packages (SOT-23, SMT3)

Compliance Parameters:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (enhanced or equivalent performance within the same functional class).

Parameter Comparison

Engineering Selection Recommendations

MMSTA14-7 (Diodes Incorporated)

This part is a parametric equivalent to the MMSTA14-7-F with identical electrical specifications and operating temperature range. Both parts are manufactured by Diodes Incorporated and share the same SOT-323 package. Selection of MMSTA14-7 is appropriate when supply chain continuity with the same manufacturer is required or when inventory availability of the -7-F variant is constrained.

2SD2142KT146 (Rohm Semiconductor)

This manufacturer-recommended substitute provides equivalent electrical performance with enhanced transition frequency (200 MHz versus 125 MHz). The part is supplied in SMT3 package (TO-236-3, SC-59, SOT-23-3 equivalent footprint) and maintains all critical electrical parameters including collector current, breakdown voltage, and saturation characteristics. The DC current gain specification differs (10000 @ 100mA, 5V) but remains within functional compatibility. This part is RoHS3 compliant and suitable for applications requiring higher frequency performance. Maximum operating temperature is specified to 150°C without lower temperature bound documentation.

MMBTA13-TP (Micro Commercial Co)

This substitute is qualified for applications where the SOT-23 package footprint is acceptable. The part maintains 300 mA collector current and 30 V breakdown voltage with enhanced power dissipation (225 mW versus 200 mW). DC current gain is specified at 10000 @ 150mA, 1V. Operating temperature range is -55°C to 150°C, matching the main part. This part is RoHS3 compliant and available in high inventory quantities.

MMBTA14-TP (Micro Commercial Co)

This substitute provides equivalent electrical performance to the main part with enhanced power dissipation (225 mW). The DC current gain specification (20000 @ 150mA, 1V) matches the main part's gain classification. The SOT-23 package is footprint-compatible with standard surface mount assembly processes. Operating temperature range is -55°C to 150°C. This part is RoHS3 compliant and suitable for direct substitution in applications where package size adjustment is feasible.

PMBTA14,215 (NXP Semiconductors)

This manufacturer-recommended substitute is qualified for automotive applications with AEC-Q101 qualification. The part provides enhanced collector current capability (500 mA versus 300 mA) and increased power dissipation (250 mW versus 200 mW). All critical electrical parameters including breakdown voltage, saturation characteristics, and DC current gain (20000 @ 100mA, 5V) are equivalent to the main part. The TO-236AB package is footprint-compatible with SOT-23 assembly. Maximum operating temperature is specified to 150°C. This part is RoHS3 compliant and suitable for applications requiring automotive-grade qualification or higher current capability.

Frequently Asked Questions (FAQ)

Q: Can MMSTA14-7 be used as a direct replacement for MMSTA14-7-F?

A: Yes. MMSTA14-7 is a parametric equivalent manufactured by the same supplier (Diodes Incorporated) with identical electrical specifications, operating temperature range (-55°C to 150°C), and SOT-323 package. Both parts meet ROHS3 compliance and MSL 1 requirements.

Q: What is the primary difference between the SOT-323 and SOT-23 packages?

A: SOT-323 (SC-70) and SOT-23 (SC-59, TO-236-3) are both surface mount packages with three leads but differ in physical dimensions and footprint layout. SOT-23 is larger than SOT-323. Substitution between these packages requires PCB layout verification to confirm footprint compatibility. The electrical performance of the transistor is independent of package type.

Q: Is 2SD2142KT146 suitable for high-frequency applications?

A: Yes. The 2SD2142KT146 features a transition frequency of 200 MHz, which exceeds the main part's 125 MHz specification. This enhanced frequency response makes it suitable for applications requiring higher switching speeds. All other electrical parameters remain equivalent to the main part.

Q: Can PMBTA14,215 be used in non-automotive applications?

A: Yes. PMBTA14,215 is qualified to AEC-Q101 automotive standards but is not restricted to automotive use. The part meets all electrical and compliance requirements for general industrial and commercial applications. The enhanced current capability (500 mA) and power dissipation (250 mW) provide additional design margin in non-automotive circuits.

Q: What is the significance of DC current gain (hFE) differences between substitute parts?

A: DC current gain determines the base current required to achieve a specified collector current. The main part specifies hFE of 20000 @ 100mA, 5V. Substitute parts with lower hFE values (such as 10000) require proportionally higher base current to achieve the same collector current. Circuit designs must account for these differences in base drive calculations. Parts with equal or higher hFE values provide equivalent or improved performance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (MMSTA14-7, 2SD2142KT146, MMBTA13-TP, MMBTA14-TP, and PMBTA14,215) are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity level, matching the main part's compliance profile.

Q: What operating temperature range should be verified for 2SD2142KT146 and PMBTA14,215?

A: Both parts specify a maximum operating temperature of 150°C. The 2SD2142KT146 does not document a minimum temperature specification in the provided data. The PMBTA14,215 similarly specifies only the maximum temperature to 150°C. Applications requiring operation below 0°C should verify detailed datasheets for these parts. The main part and MMBTA series parts explicitly support -55°C to 150°C operation.

Q: Can substitute parts be mixed within a single assembly?

A: Yes. All substitute parts meet the same electrical specifications for critical parameters (collector current, breakdown voltage, saturation voltage, and cutoff current). However, circuit designs should account for DC current gain variations when multiple parts are used in parallel or in applications with tight base drive tolerances. Consistent part selection within a single design is recommended for simplified manufacturing and quality control.

Q: What inventory considerations apply to these substitute parts?

A: PMBTA14,215 has the highest inventory availability (99,782 pcs), followed by MMBTA13-TP (45,493 pcs). MMSTA14-7 (3,728 pcs) and MMBTA14-TP (4,054 pcs) have moderate availability. The main part MMSTA14-7-F has 6,300 pcs in stock. Inventory levels should be verified at the time of procurement as availability is subject to change.