FMMTA42QTA Equivalent & Substitute Parts Reference

Part Overview

The FMMTA42QTA from Diodes Incorporated is an NPN Bipolar Junction Transistor (BJT) rated for high voltage (300 V), moderate current (200 mA), and packaged in SOT-23-3. It is AEC-Q101 automotive qualified and in active production. Alternate or equivalent models are sometimes required for supply chain assurance, multi-sourcing, and production continuity, especially when optimizing based on inventory availability or procurement logistics.

Key Parameters

Manufacturer Part Number	Manufacturer	Transistor Type	Voltage - Collector Emitter Breakdown (Max)	Current - Collector (Ic) (Max)	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Frequency - Transition	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package	Qualification	RoHS Status	REACH Status
FMMTA42QTA	Diodes Incorporated	NPN	300 V	200 mA	500mV @ 2mA, 20mA	100nA (ICBO)	40 @ 30mA, 10V	310 mW	50MHz	-55°C ~ 150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23-3	AEC-Q101	ROHS3 Compliant	REACH Unaffected

Substitute Part Grouping Explanation

Equivalent and substitute parts for the FMMTA42QTA are selected by strict equivalence in transistor type (NPN), package (TO-236-3, SC-59, SOT-23-3 or direct equivalent), maximum collector-emitter voltage rating, maximum collector current, saturation voltage, current gain, cutoff current, maximum power dissipation, transition frequency, operating temperature, automotive qualification, and RoHS/REACH compliance. Only parts matching all specified fields are considered.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Transistor Type	Voltage - Collector Emitter Breakdown (Max)	Current - Collector (Ic) (Max)	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Frequency - Transition	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package	Qualification	RoHS Status	REACH Status
FMMTA42QTA	Diodes Incorporated	NPN	300 V	200 mA	500mV @ 2mA, 20mA	100nA (ICBO)	40 @ 30mA, 10V	310 mW	50MHz	-55°C ~ 150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23-3	AEC-Q101	ROHS3 Compliant	REACH Unaffected
BFN24E6327HTSA1	Infineon Technologies	NPN	250 V	200 mA	400mV @ 2mA, 20mA	100nA (ICBO)	40 @ 30mA, 10V	360 mW	70MHz	150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	PG-SOT23	-	ROHS3 Compliant	REACH Unaffected

Engineering Selection Recommendations

FMMTA42QTA is active and AEC-Q101 qualified, suitable for automotive and high-reliability applications.
BFN24E6327HTSA1 is listed as “Last Time Buy,” which may impact long-term procurement but is ROHS3 Compliant and REACH Unaffected.
Both parts are surface mount and are compliant with current RoHS and REACH status requirements. For applications requiring AEC-Q101, only FMMTA42QTA meets the specified qualification.

Frequently Asked Questions (FAQ)

Q1: Which key parameters define the substitutability of NPN BJTs in surface-mount SOT-23-3?
A1: Key parameters are transistor polarity (NPN), voltage - collector emitter breakdown (max), collector current (max), power dissipation, current gain, cutoff current, package/case equivalence, and compliance certifications.

Q2: Is there a difference in package compatibility between FMMTA42QTA and BFN24E6327HTSA1?
A2: Both parts are supplied in TO-236-3, SC-59, SOT-23-3 package classes. Supplier-specific package variants (SOT-23-3 vs PG-SOT23) are mechanically and footprint equivalent for normal mounting processes.

Q3: What role does automotive (AEC-Q101) qualification play in part substitution?
A3: For applications that require automotive or high-reliability components, AEC-Q101 qualification is mandatory. FMMTA42QTA includes this qualification, while BFN24E6327HTSA1 does not specify it.

Q4: Are both FMMTA42QTA and BFN24E6327HTSA1 compliant with RoHS and REACH regulations?
A4: Both listed parts are ROHS3 Compliant and REACH Unaffected.

Q5: Why is it necessary to consider the operating temperature rating when selecting a substitute?
A5: The maximum junction temperature rating impacts device reliability and application environment suitability. Both parts have comparable high-temperature ratings as specified.

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