FMMT625QTA Bipolar (BJT) Transistor NPN 150V 1A SOT-23-3 Equivalent & Substitute Parts

Part Overview

FMMT625QTA is an NPN bipolar junction transistor (BJT) from Diodes Incorporated, designed for high voltage automotive applications. It offers a 150V collector-emitter breakdown voltage and a maximum collector current of 1A in a surface mount SOT-23-3 package. The product is listed as active and RoHS3 compliant. Identifying alternative models is necessary for ensuring supply continuity, optimizing inventory management, and meeting equivalent specifications in automotive and industrial designs where parametric compatibility and compliance are required.

Key Parameters

Parameter	Main Part (FMMT625QTA)
Manufacturer	Diodes Incorporated
Category	Transistors, Bipolar (BJT)
Transistor Type	NPN
Current - Collector (Ic) (Max)	1 A
Voltage - Collector Emitter Breakdown (Max)	150 V
Vce Saturation (Max) @ Ib, Ic	300mV @ 50mA, 1A
Current - Collector Cutoff (Max)	100nA
DC Current Gain (hFE) (Min) @ Ic, Vce	300 @ 200mA, 10V
Power - Max	625 mW
Frequency - Transition	135MHz
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	SOT-23-3
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected
Product Status	Active
Series	Automotive, AEC-Q101

Substitute Part Grouping Explanation

Substitution is strictly governed by matching electrical and mechanical parameters, including transistor type, collector current rating, collector-emitter breakdown voltage, saturation voltage, cutoff current, DC current gain, maximum power dissipation, transition frequency, operating temperature range, mounting type, and package/case. Regulatory compliance parameters such as RoHS and REACH status, and the active product status, are also used for direct parameter equivalence. Only parts meeting all listed key parameters are included in substitution consideration.

Parameter Comparison

Parameter	Main Part (FMMT625QTA)	Substitute (FMMT625TA)
Manufacturer	Diodes Incorporated	Diodes Incorporated
Category	Transistors, Bipolar (BJT)	Transistors, Bipolar (BJT)
Transistor Type	NPN	NPN
Current - Collector (Ic) (Max)	1 A	1 A
Voltage - Collector Emitter Breakdown (Max)	150 V	150 V
Vce Saturation (Max) @ Ib, Ic	300mV @ 50mA, 1A	300mV @ 50mA, 1A
Current - Collector Cutoff (Max)	100nA	100nA
DC Current Gain (hFE) (Min) @ Ic, Vce	300 @ 200mA, 10V	300 @ 200mA, 10V
Power - Max	625 mW	625 mW
Frequency - Transition	135MHz	135MHz
Operating Temperature	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	SOT-23-3	SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Active	Active

Engineering Selection Recommendations

Both FMMT625QTA and FMMT625TA are listed as RoHS3 compliant and REACH unaffected. Their active product status and identical electrical, mechanical, and packaging parameters establish full interchangeability in designs requiring high voltage NPN BJTs in SOT-23-3 packages. Where automotive AEC-Q101 series association is required, reference only the available series field per part listing.

Frequently Asked Questions (FAQ)

Q1: What key parameters must match for a substitute in the Transistors, Bipolar (BJT) category?
A1: Substitute selection requires matching transistor type (NPN), maximum collector current, maximum collector-emitter breakdown voltage, maximum power dissipation, current gain, saturation voltage, cutoff current, transition frequency, operating temperature range, mounting type, and package.

Q2: Are FMMT625QTA and FMMT625TA compatible in terms of electrical ratings and package form factor?
A2: Both parts are equivalent in collector current, voltage, gain, frequency, cutoff current, power dissipation, and use the same SOT-23-3 package case for surface mounting.

Q3: Does the substitute part maintain regulatory compliance?
A3: FMMT625TA is ROHS3 compliant and REACH unaffected, matching the compliance status of FMMT625QTA.

Q4: Is there any difference in the product status or series?
A4: Both products are active; only FMMT625QTA specifically references the Automotive, AEC-Q101 series.

Q5: Can Digi-Reel® or Cut Tape packaging options affect suitability?
A5: Packaging differences do not affect electrical or mechanical substitution suitability as long as the device package and case parameters are the same.

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