FMMT417TC Equivalent & Substitute Parts

Part Overview

The FMMT417TC is a Surface Mount NPN Avalanche Mode Bipolar Junction Transistor manufactured by Diodes Incorporated. This device is rated for 100V collector-emitter breakdown voltage with a maximum collector current of 500mA and 330mW power dissipation in a SOT-23-3 package. The FMMT417TC is classified as Obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and procurement needs.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the FMMT417TC is determined by electrical and mechanical compatibility across the following critical parameters:

Primary Substitution Criteria:

Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 100V
Current - Collector (Ic) (Max): Must equal or exceed 500mA
Power - Max: Must equal or exceed 330mW
Package / Case: Must be SOT-23-3 (TO-236-3, SC-59) or equivalent
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must encompass -55°C to 150°C or higher

Substitution Categories:

Category 1: Direct Parametric Equivalents (Diodes Incorporated) Parts meeting all primary criteria with identical or superior electrical specifications and active product status. These represent the preferred substitution path for the obsolete FMMT417TC.

Category 2: Manufacturer Recommended Alternatives (Higher Voltage or Current Ratings) Parts exceeding the FMMT417TC specifications in voltage, current, or frequency performance. These provide enhanced capability for applications requiring margin or future design flexibility.

Category 3: Functional Alternatives (Specialized Applications) Parts with different electrical characteristics suitable for specific application requirements where the primary criteria may be relaxed based on circuit design.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce Breakdown (Max) V	Power (Max) mW	Frequency MHz	Package	Inventory
FMMT417TC	Diodes Incorporated	Obsolete	500	100	330	40	SOT-23-3	892
FMMT415TD	Diodes Incorporated	Active	500	100	330	40	SOT-23-3	1293
FMMT417TD	Diodes Incorporated	Active	500	100	330	40	SOT-23-3	21800
BCX41E6327HTSA1	Infineon Technologies	Last Time Buy	800	125	330	100	SOT-23-3	39916
CMPT6517 TR PBFREE	Central Semiconductor Corp	Active	500	350	350	200	SOT-23	38062
CMPTA42E TR PBFREE	Central Semiconductor Corp	Active	500	350	350	75	SOT-23	27143
CMPTA46 TR PBFREE	Central Semiconductor Corp	Active	500	450	350	20	SOT-23	236766
FJV1845FMTF	onsemi	Active	50	120	300	110	SOT-23-3	80300
MMBT2484LT1G	onsemi	Active	100	60	225	—	SOT-23-3	9200
MMBT2484LT3G	onsemi	Active	100	60	225	—	SOT-23-3	30428
MMBT6429LT1G	onsemi	Active	200	45	225	700	SOT-23-3	155200

Engineering Selection Recommendations

Tier 1: Direct Substitutes (Recommended)

FMMT415TD and FMMT417TD from Diodes Incorporated are direct parametric equivalents to the FMMT417TC. Both devices maintain identical electrical specifications (100V breakdown, 500mA collector current, 330mW power, 40MHz transition frequency) and SOT-23-3 packaging. FMMT417TD is preferred due to superior inventory availability (21,800 units) and Active product status. Both parts are ROHS3 compliant with MSL 1 rating, matching the original device compliance profile.

Tier 2: Enhanced Performance Alternatives

BCX41E6327HTSA1 (Infineon Technologies) exceeds FMMT417TC specifications with 125V breakdown voltage, 800mA collector current, and 100MHz transition frequency while maintaining 330mW power dissipation and SOT-23-3 packaging. This part is suitable for applications requiring higher performance margin. Product status is Last Time Buy, indicating limited future availability.

CMPT6517 TR PBFREE and CMPTA42E TR PBFREE (Central Semiconductor Corp) provide 350V breakdown voltage with 500mA collector current and 350mW power dissipation. CMPT6517 offers 200MHz transition frequency, while CMPTA42E provides 75MHz. Both are Active status with substantial inventory. These parts are applicable where higher voltage rating is required.

CMPTA46 TR PBFREE (Central Semiconductor Corp) provides the highest voltage rating at 450V with 500mA collector current and 350mW power dissipation. Transition frequency is 20MHz. This part is Active with the largest inventory (236,766 units) and is suitable for high-voltage applications.

Tier 3: Limited Current Applications

FJV1845FMTF (onsemi) is rated for 50mA maximum collector current and 120V breakdown voltage. This part is suitable only for low-current applications and does not meet the 500mA requirement of the FMMT417TC.

MMBT2484LT1G and MMBT2484LT3G (onsemi) are rated for 100mA maximum collector current and 60V breakdown voltage. These parts do not meet the 500mA current or 100V voltage requirements of the FMMT417TC.

MMBT6429LT1G (onsemi) is rated for 200mA maximum collector current and 45V breakdown voltage. This part does not meet the 500mA current or 100V voltage requirements of the FMMT417TC.

Frequently Asked Questions (FAQ)

Q: Can FMMT417TD be used as a direct replacement for FMMT417TC?

A: Yes. FMMT417TD is a direct parametric equivalent with identical electrical specifications (100V breakdown, 500mA collector current, 330mW power, 40MHz transition frequency) and SOT-23-3 packaging. The primary difference is product status (Active vs. Obsolete) and packaging format (Cut Tape & Digi-Reel vs. standard). FMMT417TD is the recommended substitution path.

Q: What is the difference between FMMT415TD and FMMT417TD?

A: Both parts are parametric equivalents with identical electrical specifications. The primary difference is the base product number designation (FMMT415 vs. FMMT417). Both are manufactured by Diodes Incorporated, are ROHS3 compliant, and available in SOT-23-3 packaging. FMMT417TD has higher inventory availability.

Q: Can I use BCX41E6327HTSA1 in place of FMMT417TC?

A: BCX41E6327HTSA1 exceeds FMMT417TC specifications in voltage (125V vs. 100V), current (800mA vs. 500mA), and frequency (100MHz vs. 40MHz) while maintaining equivalent power dissipation (330mW) and SOT-23-3 packaging. Electrical compatibility is confirmed. However, product status is Last Time Buy, indicating limited future procurement availability.

Q: Are the Central Semiconductor parts (CMPT6517, CMPTA42E, CMPTA46) suitable substitutes?

A: These parts meet or exceed the 500mA collector current and 330mW power requirements. However, they provide significantly higher voltage ratings (350V to 450V) compared to the FMMT417TC (100V). These parts are suitable only for applications where higher voltage rating is required or beneficial. They are not direct substitutes for standard 100V applications.

Q: Why are MMBT2484 and MMBT6429 parts not recommended?

A: These onsemi parts do not meet the FMMT417TC electrical requirements. MMBT2484 is limited to 100mA collector current and 60V breakdown voltage. MMBT6429 is limited to 200mA collector current and 45V breakdown voltage. The FMMT417TC requires 500mA at 100V, which these parts cannot provide.

Q: What is the significance of the SOT-23-3 package designation?

A: SOT-23-3 (also designated TO-236-3 or SC-59) is a three-lead Surface Mount package. All recommended substitutes maintain this package format, ensuring mechanical and electrical compatibility with existing PCB layouts and soldering processes. Package compatibility is a primary substitution criterion.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and have MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the FMMT417TC. This ensures regulatory and environmental compatibility across all recommended alternatives.

Q: What inventory considerations should guide part selection?

A: FMMT417TD offers the highest inventory (21,800 units) among direct equivalents, ensuring long-term procurement availability. CMPTA46 TR PBFREE provides the largest overall inventory (236,766 units) if higher voltage rating is acceptable. FJV1845FMTF and MMBT6429LT1G also offer substantial inventory but do not meet electrical requirements for standard applications.

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