FMMTL619TC Equivalent & Substitute Parts

Part Overview

The FMMTL619TC is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-23-3 package. This device operates at 50V collector-emitter breakdown voltage with a maximum collector current of 1.25A and 500mW power dissipation. The transistor features a transition frequency of 180MHz and operates across a temperature range of -55°C to 150°C.

The FMMTL619TC is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for applications utilizing this transistor.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	-
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	1.25	A
Power - Max	500	mW
Frequency - Transition	180	MHz
Vce Saturation (Max) @ Ib, Ic	330mV @ 125mA, 1.25A	-
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 500mA, 5V	-
Operating Temperature	-55 to 150	°C
Package / Case	SOT-23-3 (TO-236-3, SC-59)	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the FMMTL619TC is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN configuration
Package / Case: SOT-23-3 surface mount form factor
Voltage - Collector Emitter Breakdown: minimum 50V
Current - Collector (Ic) (Max): minimum 1.25A
Power - Max: minimum 500mW
Operating Temperature Range: must encompass -55°C to 150°C or equivalent industrial range
RoHS Compliance: ROHS3 Compliant

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents - Parts with identical or superior electrical specifications and the same package type, differing only in packaging format (tape & reel versus cut tape).

Category 2: Functional Substitutes - Parts with reduced current or power ratings but maintaining voltage specifications and package compatibility, suitable for applications not requiring full 1.25A collector current.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Frequency (Transition)	Package	Product Status	RoHS
FMMTL619TC	Diodes Incorporated	1.25A	50V	500mW	180MHz	SOT-23-3	Obsolete	ROHS3
FMMTL619TA	Diodes Incorporated	1.25A	50V	500mW	180MHz	SOT-23-3	Active	ROHS3
2SD1484KT146Q	Rohm Semiconductor	500mA	50V	200mW	250MHz	SOT-23-3	Active	ROHS3
2SD1484KT146R	Rohm Semiconductor	500mA	50V	200mW	250MHz	SOT-23-3	Active	ROHS3
BC817-40LT1G	onsemi	500mA	45V	300mW	100MHz	SOT-23-3	Active	ROHS3
CMPT3820 TR PBFREE	Central Semiconductor Corp	1A	60V	350mW	150MHz	SOT-23-3	Active	ROHS3
CPH3216-TL-EX	onsemi	1A	50V	900mW	420MHz	SOT-23-3	Active	ROHS3
MMBT2484LT1G	onsemi	100mA	60V	225mW	-	SOT-23-3	Active	ROHS3
MMBT2484LT3G	onsemi	100mA	60V	225mW	-	SOT-23-3	Active	ROHS3
MMBT3904LT1G	onsemi	200mA	40V	300mW	300MHz	SOT-23-3	Active	ROHS3
MMBT3904LT3G	onsemi	200mA	40V	300mW	300MHz	SOT-23-3	Active	ROHS3

Engineering Selection Recommendations

Direct Parametric Equivalent:

FMMTL619TA is the primary substitute for FMMTL619TC. Both parts are manufactured by Diodes Incorporated and share identical electrical specifications: 1.25A collector current, 50V breakdown voltage, 500mW power dissipation, and 180MHz transition frequency. The FMMTL619TA is in active production status, ensuring long-term availability. The only difference is packaging format (tape & reel versus cut tape). This part maintains full compatibility with existing designs.

Secondary Substitutes for Current-Limited Applications:

For applications where collector current requirements do not exceed 1A, the CMPT3820 TR PBFREE (Central Semiconductor Corp) provides superior voltage margin (60V breakdown) and equivalent power handling (350mW). This part is in active production status and ROHS3 compliant.

For applications where collector current does not exceed 500mA, the 2SD1484KT146R (Rohm Semiconductor) offers higher transition frequency (250MHz) while maintaining 50V breakdown voltage. This part is in active production status with substantial inventory availability.

High-Frequency Alternative:

The CPH3216-TL-EX (onsemi) provides the highest transition frequency (420MHz) with 1A collector current capability and 50V breakdown voltage. This part is suitable for applications requiring enhanced high-frequency performance and is in active production status.

Lower Current Alternatives:

The MMBT3904LT1G and MMBT3904LT3G (onsemi) are suitable only for applications requiring maximum 200mA collector current. These parts feature 300MHz transition frequency but operate at reduced voltage (40V breakdown). The BC817-40LT1G (onsemi) similarly supports 500mA maximum collector current at 45V breakdown voltage.

The MMBT2484LT1G and MMBT2484LT3G (onsemi) are restricted to 100mA collector current applications and are not suitable for designs requiring the full 1.25A capability of the FMMTL619TC.

All recommended substitutes maintain ROHS3 compliance and MSL-1 moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage procedures.

Frequently Asked Questions (FAQ)

Q: Can FMMTL619TA directly replace FMMTL619TC in existing designs?

A: Yes. FMMTL619TA is a direct parametric equivalent with identical electrical specifications. The only difference is packaging format (tape & reel). Both parts are SOT-23-3 surface mount devices with 1.25A collector current, 50V breakdown voltage, and 500mW power dissipation. No circuit modifications are required.

Q: What is the primary limitation when selecting substitute parts for FMMTL619TC?

A: The primary limitation is collector current capacity. The FMMTL619TC supports 1.25A maximum collector current. Substitute parts with lower current ratings (such as MMBT3904 at 200mA or BC817 at 500mA) are only suitable for applications not requiring the full current specification. Verify application current requirements before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant and maintain MSL-1 moisture sensitivity rating, ensuring compatibility with standard manufacturing processes and storage requirements.

Q: What is the difference between FMMTL619TA and FMMTL619TC?

A: Both parts are electrically identical. FMMTL619TC is supplied in cut tape format, while FMMTL619TA is supplied in tape & reel format. FMMTL619TC is classified as obsolete, while FMMTL619TA is in active production. For new designs and ongoing production, FMMTL619TA is the recommended choice.

Q: Can CMPT3820 TR PBFREE replace FMMTL619TC in high-current applications?

A: CMPT3820 TR PBFREE is suitable only for applications requiring maximum 1A collector current. The FMMTL619TC supports 1.25A. If the application requires the full 1.25A specification, CMPT3820 is not appropriate. If application current does not exceed 1A, CMPT3820 provides superior voltage margin (60V versus 50V) and is in active production status.

Q: What is the significance of transition frequency differences among substitute parts?

A: Transition frequency (fT) indicates the maximum frequency at which the transistor maintains useful gain. The FMMTL619TC operates at 180MHz. Substitutes with higher transition frequencies (such as CPH3216-TL-EX at 420MHz or 2SD1484 at 250MHz) are suitable for high-frequency applications. Substitutes with lower transition frequencies (such as BC817-40LT1G at 100MHz) are restricted to lower-frequency applications. Verify application frequency requirements before substitution.

Q: Are packaging differences between SOT-23-3 and SMT3 significant?

A: Yes. SOT-23-3 and SMT3 are distinct package designations. While both are surface mount packages with similar physical dimensions, they may have different pin configurations or lead specifications. Verify package compatibility with PCB design and assembly equipment before substitution. The FMMTL619TC uses SOT-23-3 package; substitutes must also specify SOT-23-3 or equivalent package designation.

Q: What inventory considerations apply to substitute selection?

A: FMMTL619TA has substantial inventory availability (68,350 pieces), ensuring reliable supply for production requirements. CPH3216-TL-EX has limited inventory (703 pieces). When selecting substitutes, consider both immediate availability and long-term supply continuity. Active production status indicates ongoing manufacturing support.

Q: Can MMBT3904 series parts replace FMMTL619TC?

A: MMBT3904 series parts (MMBT3904LT1G and MMBT3904LT3G) are not suitable as direct replacements. These parts support only 200mA maximum collector current, compared to 1.25A for FMMTL619TC. Additionally, MMBT3904 operates at 40V breakdown voltage, below the 50V specification of FMMTL619TC. These parts are suitable only for low-current applications not requiring the full specifications of the original device.

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