FMMT415TA Equivalent & Substitute Parts

Part Overview

The FMMT415TA is a Surface Mount NPN Avalanche Mode Bipolar Junction Transistor manufactured by Diodes Incorporated, rated for 100 V collector-emitter breakdown voltage and 500 mA maximum collector current. This device is packaged in SOT-23-3 (TO-236-3) configuration with a maximum power dissipation of 330 mW and transition frequency of 40 MHz. The FMMT415TA is classified as Obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with modified parameters suitable for specific application requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Avalanche Mode	—
Collector Current (Max)	500	mA
Collector-Emitter Breakdown Voltage (Max)	100	V
Vce Saturation (Max)	500 mV @ 1 mA, 10 mA	—
Collector Cutoff Current (Max)	100	nA
DC Current Gain (hFE Min)	25 @ 10 mA, 10 V	—
Power Dissipation (Max)	330	mW
Transition Frequency	40	MHz
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the FMMT415TA is determined by electrical parameter compatibility within the SOT-23-3 surface mount package. The critical parameters governing substitution are collector current rating, collector-emitter breakdown voltage, power dissipation capability, and DC current gain characteristics. Parts are grouped into two categories:

Parametric Equivalents maintain identical electrical specifications across all key parameters, ensuring direct replacement without circuit modification. These parts satisfy the full operational envelope of the original FMMT415TA.

Functional Substitutes provide alternative electrical characteristics that remain compatible with application requirements while offering enhanced performance in specific parameters. Substitutes may feature higher breakdown voltage, increased collector current capacity, or improved frequency response, provided the original circuit design accommodates these enhancements. Substitutes with reduced ratings (lower voltage or current) are suitable only for applications where the original part was over-specified.

The following parameters determine substitution validity:

Collector-Emitter Breakdown Voltage (must equal or exceed application requirement)
Maximum Collector Current (must equal or exceed application requirement)
Power Dissipation (must equal or exceed application requirement)
Package/Case (must be SOT-23-3 compatible)
Operating Temperature Range (must encompass application operating conditions)
RoHS and Moisture Sensitivity compliance (must match or exceed original specifications)

Parameter Comparison

Parameter	FMMT415TA	FMMT415TD	FMMT417TD	BCX41E6327HTSA1	FJV1845FMTF	MMBT2484LT3G	MMBT6429LT1G
Manufacturer	Diodes Inc.	Diodes Inc.	Diodes Inc.	Infineon	onsemi	onsemi	onsemi
Product Status	Obsolete	Active	Active	Last Time Buy	Active	Active	Active
Transistor Type	NPN - Avalanche Mode	NPN - Avalanche Mode	NPN - Avalanche Mode	NPN	NPN	NPN	NPN
Ic (Max) [mA]	500	500	500	800	50	100	200
Vce Breakdown (Max) [V]	100	100	100	125	120	60	45
Vce Saturation (Max) [mV]	500 @ 1mA, 10mA	500 @ 1mA, 10mA	500 @ 1mA, 10mA	900 @ 30mA, 300mA	300 @ 1mA, 10mA	350 @ 100µA, 1mA	600 @ 5mA, 100mA
Icbo (Max) [nA]	100	100	100	10000	50	10	100
hFE (Min)	25 @ 10mA, 10V	25 @ 10mA, 10V	25 @ 10mA, 10V	40 @ 200mA, 1V	300 @ 1mA, 6V	250 @ 1mA, 5V	500 @ 100µA, 5V
Power (Max) [mW]	330	330	330	330	300	225	225
Frequency - Transition [MHz]	40	40	40	100	110	—	700
Operating Temperature [°C]	-55 to 150	-55 to 150	-55 to 150	to 150	to 150	-55 to 150	-55 to 150
Package	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents)

FMMT415TD and FMMT417TD are parametric equivalents of the FMMT415TA, maintaining identical electrical specifications including 100 V breakdown voltage, 500 mA collector current, 330 mW power dissipation, and 40 MHz transition frequency. Both parts are manufactured by Diodes Incorporated and are classified as Active products, ensuring long-term availability and supply continuity. FMMT415TD is available in Tape & Reel packaging with 1,293 units in stock. FMMT417TD is available in Cut Tape & Digi-Reel packaging with 21,800 units in stock. Both parts are ROHS3 compliant with MSL 1 rating and are suitable for direct substitution in existing designs without circuit modification.

Functional Substitutes with Enhanced Specifications

BCX41E6327HTSA1 (Infineon Technologies) provides enhanced electrical performance with 125 V breakdown voltage, 800 mA collector current, and 100 MHz transition frequency, while maintaining 330 mW power dissipation and SOT-23-3 packaging. This part is classified as Last Time Buy. The increased current and voltage ratings accommodate applications requiring higher performance margins. The higher transition frequency (100 MHz versus 40 MHz) supports faster switching applications. This part is suitable for applications where the FMMT415TA was over-specified or where enhanced performance is beneficial.

FJV1845FMTF (onsemi) is rated for 120 V breakdown voltage, 50 mA collector current, and 110 MHz transition frequency with 300 mW power dissipation. This part is classified as Active. The reduced collector current rating (50 mA versus 500 mA) restricts this part to low-current applications. The higher transition frequency and improved saturation characteristics (300 mV versus 500 mV) make this part suitable for high-speed switching circuits operating at reduced current levels.

MMBT2484LT3G (onsemi) is rated for 60 V breakdown voltage, 100 mA collector current, and 225 mW power dissipation. This part is classified as Active with 30,428 units in stock. The reduced voltage and current ratings restrict this part to applications where the original FMMT415TA was over-specified. This part is suitable for low-voltage, low-current applications within the 60 V and 100 mA envelope.

MMBT6429LT1G (onsemi) is rated for 45 V breakdown voltage, 200 mA collector current, and 700 MHz transition frequency with 225 mW power dissipation. This part is classified as Active with 155,200 units in stock. The significantly higher transition frequency (700 MHz) and reduced voltage rating (45 V) make this part suitable for high-frequency applications operating at reduced voltage levels. The reduced power dissipation (225 mW) requires thermal design consideration.

All substitute parts maintain SOT-23-3 packaging compatibility, ROHS3 compliance, and MSL 1 rating, ensuring compatibility with existing assembly processes and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can FMMT415TD be used as a direct replacement for FMMT415TA?

A: Yes. FMMT415TD is a parametric equivalent with identical electrical specifications: 100 V breakdown voltage, 500 mA collector current, 330 mW power dissipation, 40 MHz transition frequency, and SOT-23-3 packaging. FMMT415TD is manufactured by Diodes Incorporated and classified as Active, providing long-term availability. No circuit modification is required.

Q: What is the difference between FMMT415TD and FMMT417TD?

A: FMMT415TD and FMMT417TD are parametric equivalents with identical electrical specifications. The primary difference is packaging format: FMMT415TD is supplied in Tape & Reel (TR) format, while FMMT417TD is supplied in Cut Tape (CT) & Digi-Reel format. Both parts are manufactured by Diodes Incorporated and are classified as Active. Selection depends on assembly equipment compatibility and procurement requirements.

Q: Can BCX41E6327HTSA1 replace FMMT415TA in all applications?

A: BCX41E6327HTSA1 provides enhanced specifications (125 V breakdown, 800 mA collector current, 100 MHz transition frequency) compared to FMMT415TA (100 V, 500 mA, 40 MHz). This part is suitable for applications where higher performance margins are beneficial or where the original part was over-specified. However, BCX41E6327HTSA1 is classified as Last Time Buy, indicating limited future availability. For new designs requiring long-term supply, FMMT415TD or FMMT417TD are preferred.

Q: Why are MMBT2484LT3G and MMBT6429LT1G listed as substitutes if they have lower voltage ratings?

A: MMBT2484LT3G (60 V) and MMBT6429LT1G (45 V) are functional substitutes suitable only for applications where the original FMMT415TA (100 V) was over-specified. These parts are listed because they share the same SOT-23-3 package and NPN transistor type. Selection of these parts requires verification that the application voltage requirements do not exceed the substitute part ratings. These parts are not suitable for 100 V applications.

Q: Are all substitute parts available in the same packaging as FMMT415TA?

A: Yes. All equivalent and substitute parts listed are available in SOT-23-3 (TO-236-3, SC-59) surface mount packaging, ensuring mechanical and thermal compatibility with existing PCB designs and assembly processes. Packaging format variations (Tape & Reel, Cut Tape, Digi-Reel) depend on supplier and procurement requirements but do not affect electrical performance or PCB mounting compatibility.

Q: What compliance certifications apply to all listed parts?

A: All equivalent and substitute parts are ROHS3 compliant and carry Moisture Sensitivity Level (MSL) 1 rating (Unlimited), indicating no moisture sensitivity restrictions. All parts are REACH Unaffected. These certifications ensure compatibility with modern assembly processes and environmental regulations.

Q: Which substitute part offers the highest frequency performance?

A: MMBT6429LT1G offers the highest transition frequency at 700 MHz, compared to FMMT415TA at 40 MHz. However, MMBT6429LT1G is rated for only 45 V breakdown voltage and 200 mA collector current. This part is suitable for high-frequency applications operating within the 45 V and 200 mA envelope. BCX41E6327HTSA1 offers 100 MHz transition frequency with higher voltage and current ratings (125 V, 800 mA), providing a balance between frequency performance and power handling capability.

Q: What is the inventory status of equivalent parts?

A: FMMT415TD (Diodes Incorporated) has 1,293 units in stock. FMMT417TD (Diodes Incorporated) has 21,800 units in stock. Both parts are classified as Active, ensuring continued availability. FMMT415TA (original part) has 17,591 units in stock but is classified as Obsolete. For new procurement, FMMT415TD or FMMT417TD are recommended to ensure long-term supply continuity.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message