FMMTA13TC NPN Darlington Transistor Equivalent & Substitute Parts

Part Overview

The FMMTA13TC 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 40 V collector-emitter breakdown voltage and 300 mA maximum collector current with a maximum power dissipation of 330 mW. The FMMTA13TC is classified as obsolete, necessitating identification of active substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Substiute Parts

FMMTA13TC

Diodes IncorporatedIn Stock: 898FMMTA13TC Datasheet

Current PartRFQ

2SD1383KT146B

Rohm SemiconductorIn Stock: 575062SD1383KT146B Datasheet

MFR RecommendedRFQ

2SD2142KT146

Rohm SemiconductorIn Stock: 191142SD2142KT146 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the FMMTA13TC must satisfy the following electrical and mechanical criteria:

Mandatory Compatibility Parameters:

• Transistor Type: NPN - Darlington configuration
• Package / Case: SOT-23-3 (TO-236-3, SC-59)
• Mounting Type: Surface Mount
• Current - Collector (Ic) Max: 300 mA (equal or greater)
• Voltage - Collector Emitter Breakdown: Must support minimum 40 V application requirements

Acceptable Variation Parameters:

• Power - Max: May be lower than 330 mW if application power dissipation permits
• Vce Saturation: May vary within acceptable switching performance margins
• DC Current Gain (hFE): May differ from 10000 minimum if application gain requirements are met
• Frequency - Transition: Additional capability does not disqualify substitution

The identified substitute parts meet these criteria while offering active product status and improved availability compared to the obsolete FMMTA13TC.

Parameter Comparison

Engineering Selection Recommendations

2SD2142KT146 (Primary Substitute): This Rohm Semiconductor component maintains the highest electrical compatibility with the FMMTA13TC. It provides identical maximum collector current (300 mA) and DC current gain specification (10000 @ 100mA, 5V). The 30 V collector-emitter breakdown voltage is lower than the original 40 V specification; this substitution is suitable for applications operating at or below 30 V. The component is ROHS3 compliant and carries active product status with substantial inventory availability (19091 Pcs). The reduced power rating (200 mW versus 330 mW) requires verification that application power dissipation does not exceed this limit.

2SD1383KT146B (Secondary Substitute): This Rohm Semiconductor alternative provides the same maximum collector current (300 mA) and SOT-23-3 package compatibility. The 32 V collector-emitter breakdown voltage accommodates applications up to 32 V. The DC current gain is specified at 5000 minimum (50% of the original), which is acceptable for applications not requiring the higher gain of the FMMTA13TC. This component offers the highest inventory availability (57400 Pcs) and active product status. The reduced power rating (200 mW) applies the same constraint as the primary substitute.

Both substitutes are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance equivalent to the original component.

Frequently Asked Questions (FAQ)

Q: Can the 2SD2142KT146 or 2SD1383KT146B be used in all applications where the FMMTA13TC was specified?

A: Direct substitution depends on application voltage requirements. The FMMTA13TC is rated for 40 V breakdown voltage. The 2SD2142KT146 is rated for 30 V and the 2SD1383KT146B for 32 V. Both substitutes are suitable only for applications operating at or below their respective voltage ratings. Applications requiring the full 40 V rating cannot use these substitutes.

Q: What is the impact of the reduced DC current gain in the 2SD1383KT146B?

A: The 2SD1383KT146B specifies a minimum DC current gain of 5000 at 100 mA and 5 V, compared to 10000 for the FMMTA13TC. Applications requiring high current gain for low base drive current operation may experience reduced performance. Applications with adequate base drive current will not be affected by this difference.

Q: Are the power dissipation differences significant?

A: The FMMTA13TC is rated for 330 mW maximum power dissipation, while both substitutes are rated for 200 mW. Applications dissipating more than 200 mW will exceed the substitute component ratings. Thermal management and duty cycle analysis are required to confirm that application power dissipation remains within the 200 mW limit.

Q: Do the substitute parts have identical package dimensions?

A: Yes. Both the FMMTA13TC and the substitute parts use the SOT-23-3 package (also designated TO-236-3 or SC-59). Pin configuration and footprint are identical, permitting direct board-level substitution without layout modification.

Q: What is the difference between the two substitute options?

A: The 2SD2142KT146 provides higher voltage capability (30 V versus 32 V) and maintains the original DC current gain specification (10000). The 2SD1383KT146B offers higher inventory availability and slightly higher voltage capability (32 V) but with reduced DC current gain (5000). Selection depends on whether the application requires the higher gain specification or benefits from greater inventory availability.

Q: Are both substitutes RoHS and REACH compliant?

A: Yes. Both the 2SD2142KT146 and 2SD1383KT146B are ROHS3 compliant and REACH unaffected, matching the compliance status of the original FMMTA13TC.