FMMT417TA Equivalent & Substitute Parts

Part Overview

The FMMT417TA is a Surface Mount NPN Avalanche Mode Bipolar Junction Transistor manufactured by Diodes Incorporated, rated for 100V collector-emitter breakdown voltage and 500mA maximum collector current. This device is classified as Obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and procurement continuity. The part is housed in a SOT-23-3 package and complies with RoHS3 and REACH standards.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the FMMT417TA is determined by electrical and mechanical compatibility across the following critical parameters:

Primary Substitution Criteria:

Collector-Emitter Breakdown Voltage (VCEO): Must equal or exceed 100V
Collector Current Rating (IC Max): Must equal or exceed 500mA
Power Dissipation: Must equal or exceed 330mW
Package Type: SOT-23-3 (TO-236-3, SC-59)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

DC Current Gain (hFE): Minimum 25 at specified test conditions
Vce Saturation characteristics
Collector Cutoff Current (ICBO)
Operating Temperature Range: Minimum -55°C to 150°C

Substitute parts are categorized into two groups:

Group 1 - Direct Parametric Equivalents (Diodes Incorporated): Parts maintaining identical electrical specifications and avalanche mode operation with active product status.

Group 2 - Functional Equivalents (Alternative Manufacturers): Parts meeting or exceeding the primary electrical requirements with compatible packaging, though differing in secondary parameters such as transition frequency or current gain characteristics.

Parameter Comparison

Part Number	Manufacturer	VCEO (V)	IC Max (mA)	Power (mW)	hFE Min	fT (MHz)	Package	Status
FMMT417TA	Diodes Inc.	100	500	330	25	40	SOT-23-3	Obsolete
FMMT415TD	Diodes Inc.	100	500	330	25	40	SOT-23-3	Active
FMMT417TD	Diodes Inc.	100	500	330	25	40	SOT-23-3	Active
BCX41E6327HTSA1	Infineon	125	800	330	40	100	SOT-23-3	Last Time Buy
CMPT6517 TR PBFREE	Central Semi.	350	500	350	20	200	SOT-23-3	Active
CMPTA46 TR PBFREE	Central Semi.	450	500	350	50	20	SOT-23-3	Active
FJV1845FMTF	onsemi	120	50	300	300	110	SOT-23-3	Active
MMBT2484LT1G	onsemi	60	100	225	250	—	SOT-23-3	Active
MMBT2484LT3G	onsemi	60	100	225	250	—	SOT-23-3	Active
MMBT6429LT1G	onsemi	45	200	225	500	700	SOT-23-3	Active
NSS1C201LT1G	onsemi	100	2000	490	120	110	SOT-23-3	Active

Engineering Selection Recommendations

Tier 1 - Recommended Direct Replacements:

FMMT417TD and FMMT415TD are the primary substitutes for FMMT417TA. Both parts are manufactured by Diodes Incorporated and maintain identical electrical specifications including 100V VCEO, 500mA IC maximum, 330mW power dissipation, and 40MHz transition frequency. FMMT417TD carries Active product status with 21,800 units in stock and is available in Cut Tape and Digi-Reel packaging. FMMT415TD is also Active with 1,293 units available in Tape & Reel packaging. Both components comply with RoHS3 and REACH standards with MSL Level 1 moisture sensitivity rating.

Tier 2 - Functional Equivalents with Enhanced Ratings:

BCX41E6327HTSA1 (Infineon) provides enhanced electrical performance with 125V VCEO and 800mA IC maximum while maintaining 330mW power dissipation. This part carries Last Time Buy status and is suitable for applications requiring higher voltage or current margins. CMPT6517 TR PBFREE (Central Semiconductor) offers 350V VCEO and 200MHz transition frequency, appropriate for high-voltage applications. CMPTA46 TR PBFREE provides 450V VCEO with 236,766 units in stock, suitable for extreme voltage environments.

Tier 3 - Limited Compatibility Substitutes:

NSS1C201LT1G (onsemi) matches the 100V VCEO rating but provides significantly higher current capability (2A maximum) and power dissipation (490mW), suitable only for applications requiring higher current handling. FJV1845FMTF, MMBT2484LT1G, MMBT2484LT3G, and MMBT6429LT1G do not meet the full electrical requirements of FMMT417TA and are not recommended as direct substitutes due to insufficient voltage or current ratings.

All recommended substitutes maintain SOT-23-3 surface mount packaging, RoHS3 compliance, and MSL Level 1 moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can FMMT417TD be used as a direct replacement for FMMT417TA?

A: Yes. FMMT417TD is a direct parametric equivalent with identical electrical specifications (100V VCEO, 500mA IC, 330mW power, 40MHz fT) and SOT-23-3 packaging. The primary difference is product status (Active vs. Obsolete) and packaging format (Cut Tape & Digi-Reel vs. standard). Both are manufactured by Diodes Incorporated and comply with RoHS3 and REACH standards.

Q: What is the difference between FMMT415TD and FMMT417TD?

A: Both parts are manufactured by Diodes Incorporated and share identical electrical specifications. The primary distinction is the base product number (FMMT415 vs. FMMT417), which may reflect internal design revisions or manufacturing process differences. Both are suitable substitutes for FMMT417TA with equivalent performance characteristics.

Q: Can I use BCX41E6327HTSA1 as a substitute?

A: BCX41E6327HTSA1 can be used in applications where higher voltage (125V vs. 100V) and current (800mA vs. 500mA) ratings provide design margin. However, this part carries Last Time Buy status, indicating limited future availability. The higher transition frequency (100MHz vs. 40MHz) and different current gain characteristics (40 vs. 25) may affect circuit behavior in sensitive applications.

Q: Are MMBT2484LT1G and MMBT6429LT1G suitable replacements?

A: No. MMBT2484LT1G is rated for only 60V VCEO and 100mA IC maximum, both below FMMT417TA requirements. MMBT6429LT1G is rated for 45V VCEO and 200mA IC maximum, also insufficient. These parts do not meet the primary electrical requirements and are not recommended as substitutes.

Q: What is the significance of the packaging designations (TR, CT, Digi-Reel)?

A: TR (Tape & Reel) and CT (Cut Tape) & Digi-Reel refer to supply formats for surface mount components. TR indicates standard tape and reel packaging for automated assembly. CT & Digi-Reel indicates cut tape format with optional Digi-Reel carrier. All formats are compatible with standard pick-and-place equipment. Selection depends on production volume and assembly line requirements rather than electrical performance.

Q: Why is FMMT417TA classified as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued production and will not accept new orders. This necessitates transition to active alternatives such as FMMT417TD or FMMT415TD to ensure long-term supply chain continuity and design sustainability.

Q: Do all substitute parts comply with RoHS3 and REACH?

A: Yes. All listed substitute parts comply with RoHS3 and REACH standards. All components carry MSL Level 1 (Unlimited) moisture sensitivity rating, indicating no special moisture control requirements during storage or handling.

Q: What is the operating temperature range for substitute parts?

A: FMMT417TD, FMMT415TD, CMPT6517, and CMPTA46 support -55°C to 150°C operating range, matching FMMT417TA. BCX41E6327HTSA1 and FJV1845FMTF specify maximum junction temperature of 150°C. NSS1C201LT1G supports -55°C to 150°C. MMBT2484 variants support -55°C to 150°C. All parts are suitable for extended temperature applications.

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