FMMT38CTC Equivalent & Substitute Parts

Part Overview

The FMMT38CTC 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 60 V collector-emitter breakdown voltage with a maximum collector current of 300 mA and 330 mW power dissipation. The FMMT38CTC is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across critical electrical parameters including voltage rating, current capacity, and thermal operating range.

Substiute Parts

FMMT38CTC

Diodes IncorporatedIn Stock: 1180FMMT38CTC Datasheet

Current PartRFQ

BCV47TC

Diodes IncorporatedIn Stock: 21132BCV47TC Datasheet

MFR RecommendedRFQ

2SD1383KT146B

Rohm SemiconductorIn Stock: 575062SD1383KT146B Datasheet

MFR RecommendedRFQ

2SD2142KT146

Rohm SemiconductorIn Stock: 191142SD2142KT146 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FMMT38CTC is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Transistor Type: NPN - Darlington configuration
• Package / Case: SOT-23-3 (TO-236-3, SC-59)
• Mounting Type: Surface Mount
• Voltage - Collector Emitter Breakdown (Max): Equal to or greater than 60 V
• Current - Collector (Ic) (Max): Equal to or greater than 300 mA
• Power - Max: Equal to or greater than 330 mW
• Operating Temperature Range: Minimum -55°C to maximum 150°C
• RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories based on voltage rating alignment:

Category 1 - Full Voltage Rating Match (60 V): BCV47TC maintains the 60 V collector-emitter breakdown voltage specification, providing direct substitution with enhanced current capacity and transition frequency.

Category 2 - Reduced Voltage Rating (30-32 V): 2SD2142KT146 and 2SD1383KT146B operate at reduced voltage ratings (30 V and 32 V respectively) and are suitable only for applications where the circuit design does not require the full 60 V rating of the original component.

Parameter Comparison

Engineering Selection Recommendations

BCV47TC (Diodes Incorporated) is the primary substitute for the FMMT38CTC. This part is manufactured by the same supplier, maintains the 60 V collector-emitter breakdown voltage specification, and exceeds the original current capacity at 500 mA. The BCV47TC is in active production status with ROHS3 compliance and unlimited moisture sensitivity level. The higher DC current gain (10000 vs. 5000) and transition frequency of 170 MHz provide enhanced performance characteristics. This substitute is suitable for direct replacement in applications requiring the full 60 V voltage rating.

2SD2142KT146 (Rohm Semiconductor) and 2SD1383KT146B (Rohm Semiconductor) are alternative substitutes with reduced voltage ratings of 30 V and 32 V respectively. Both parts maintain the 300 mA collector current specification and are in active production status with ROHS3 compliance. These substitutes are applicable only to circuit designs where the maximum operating voltage does not exceed 30 V or 32 V. The 2SD2142KT146 provides a higher DC current gain of 10000, while the 2SD1383KT146B matches the original gain specification at 5000. Both Rohm devices feature higher transition frequencies (200-250 MHz) compared to the original FMMT38CTC.

Selection between substitute parts depends on the specific voltage requirements of the application. Applications requiring 60 V operation must use BCV47TC. Applications operating at 30 V or below may use either Rohm device based on current gain and frequency requirements.

Frequently Asked Questions (FAQ)

Q: Can BCV47TC be used as a direct replacement for FMMT38CTC?

A: Yes. BCV47TC is a direct substitute for FMMT38CTC. Both devices share the same 60 V collector-emitter breakdown voltage, SOT-23-3 package, and surface mount configuration. BCV47TC exceeds the original specifications in collector current capacity (500 mA vs. 300 mA) and provides higher DC current gain (10000 vs. 5000). The part is in active production status.

Q: What is the difference between BCV47TC and the Rohm substitutes?

A: BCV47TC maintains the 60 V voltage rating of the original FMMT38CTC, while 2SD2142KT146 and 2SD1383KT146B operate at reduced voltage ratings of 30 V and 32 V respectively. Selection depends on the maximum voltage requirements of the application circuit. All three substitutes share the SOT-23-3 package and surface mount configuration.

Q: Can 2SD2142KT146 or 2SD1383KT146B be used in applications requiring 60 V operation?

A: No. The 2SD2142KT146 and 2SD1383KT146B are rated for maximum collector-emitter breakdown voltages of 30 V and 32 V respectively. These parts are not suitable for applications requiring 60 V operation. Use BCV47TC for 60 V applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. BCV47TC, 2SD2142KT146, and 2SD1383KT146B are all ROHS3 compliant. All substitutes meet the same environmental and regulatory requirements as the original FMMT38CTC.

Q: What is the package compatibility between FMMT38CTC and substitute parts?

A: All substitute parts use the SOT-23-3 package (also designated TO-236-3 or SC-59), which is identical to the original FMMT38CTC. No PCB layout modifications are required for substitution.

Q: Do the substitute parts have different thermal operating ranges?

A: BCV47TC maintains the same operating temperature range as FMMT38CTC (-55°C to 150°C). The Rohm substitutes (2SD2142KT146 and 2SD1383KT146B) specify a maximum junction temperature of 150°C, which is compatible with the original specification.

Q: What is the inventory status of substitute parts?

A: BCV47TC has 21,078 pieces in stock. 2SD2142KT146 has 19,091 pieces in stock. 2SD1383KT146B has 57,400 pieces in stock. All substitutes are in active production with established supply chains.