FMMT497TC Equivalent & Substitute Parts

Part Overview

The FMMT497TC 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 300 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and 500 mW power dissipation. The FMMT497TC is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, and thermal characteristics while accommodating available packaging options.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	300	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	500	mW
Frequency - Transition	75	MHz
Vce Saturation (Max) @ Ib, Ic	300mV @ 25mA, 250mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	80 @ 100mA, 10V	—
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3	—

Substitute Part Grouping Explanation

Substitute parts for the FMMT497TC are classified into two categories based on electrical parameter alignment:

Category 1: Direct Parametric Equivalents

Parts in this category maintain all critical electrical specifications of the FMMT497TC: 300 V collector-emitter breakdown voltage, 500 mA maximum collector current, 500 mW power dissipation, 75 MHz transition frequency, and identical saturation voltage characteristics. These parts are functionally interchangeable at the circuit level and differ only in product status or packaging format.

Category 2: Functional Substitutes with Parameter Deviations

Parts in this category share the 300 V voltage rating and SOT-23-3 package but deviate in one or more of the following parameters: maximum collector current, power dissipation, transition frequency, or saturation voltage. These substitutes are suitable only when circuit design margins accommodate the reduced or different electrical specifications.

Key Parameters Determining Substitution:

Voltage - Collector Emitter Breakdown (Max): 300 V minimum required
Current - Collector (Ic) (Max): 500 mA for direct equivalents; lower values acceptable with design verification
Power - Max: 500 mW for direct equivalents; lower values acceptable with thermal analysis
Frequency - Transition: 75 MHz for direct equivalents
Vce Saturation: 300mV @ 25mA, 250mA for direct equivalents
Package / Case: SOT-23-3 compatibility required
Mounting Type: Surface Mount required

Parameter Comparison

Part Number	Manufacturer	Vce Breakdown (V)	Ic Max (mA)	Power Max (mW)	Frequency (MHz)	Vce Sat @ Ib, Ic	hFE Min @ Ic, Vce	Product Status	Package
FMMT497TC	Diodes Incorporated	300	500	500	75	300mV @ 25mA, 250mA	80 @ 100mA, 10V	Obsolete	SOT-23-3
FMMT497TA	Diodes Incorporated	300	500	500	75	300mV @ 25mA, 250mA	80 @ 100mA, 10V	Active	SOT-23-3
TSC497CX RFG	Taiwan Semiconductor Corporation	300	500	500	75	300mV @ 25mA, 250mA	100 @ 1mA, 10V	Active	SOT-23-3
MMBTA42LT1G	onsemi	300	500	225	50	500mV @ 2mA, 20mA	40 @ 30mA, 10V	Active	SOT-23-3
MMBTA42,215	Nexperia USA Inc.	300	100	250	50	500mV @ 2mA, 20mA	40 @ 30mA, 10V	Active	SOT-23-3
PMBTA42,215	Nexperia USA Inc.	300	100	250	50	500mV @ 2mA, 20mA	40 @ 30mA, 10V	Active	SOT-23-3
PMBTA42,235	Nexperia USA Inc.	300	100	250	50	500mV @ 2mA, 20mA	40 @ 30mA, 10V	Active	SOT-23-3
BF820,215	Nexperia USA Inc.	300	50	250	60	600mV @ 5mA, 30mA	50 @ 25mA, 20V	Active	SOT-23-3
MMBT2484LT1G	onsemi	60	100	225	—	350mV @ 100µA, 1mA	250 @ 1mA, 5V	Active	SOT-23-3
MMBT2484LT3G	onsemi	60	100	225	—	350mV @ 100µA, 1mA	250 @ 1mA, 5V	Active	SOT-23-3
MMBT6429LT1G	onsemi	45	200	225	700	600mV @ 5mA, 100mA	500 @ 100µA, 5V	Active	SOT-23-3

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended for Drop-In Replacement)

FMMT497TA and TSC497CX RFG are direct parametric equivalents to the obsolete FMMT497TC. Both parts maintain 300 V breakdown voltage, 500 mA collector current, 500 mW power dissipation, and 75 MHz transition frequency. FMMT497TA is manufactured by Diodes Incorporated with Active product status and is available in Cut Tape and Digi-Reel packaging. TSC497CX RFG is manufactured by Taiwan Semiconductor Corporation with Active product status and is available in Tape & Reel packaging. Both parts are ROHS3 compliant and REACH unaffected. Selection between these two should be based on supply chain preference and packaging requirements.

Functional Substitutes with Reduced Current Capacity

MMBTA42LT1G (onsemi) maintains the 300 V voltage rating and 500 mA collector current specification but reduces power dissipation to 225 mW and transition frequency to 50 MHz. This part is suitable for applications where the reduced power budget and lower frequency response are acceptable. MMBTA42,215 and PMBTA42,215 (Nexperia USA Inc.) further reduce maximum collector current to 100 mA and power dissipation to 250 mW while maintaining 300 V breakdown voltage. PMBTA42,215 and PMBTA42,235 include automotive qualification (AEC-Q101) and are suitable for automotive applications. These parts require circuit design verification to confirm adequate current margin.

Functional Substitutes with Reduced Voltage Rating

MMBT6429LT1G (onsemi) reduces the collector-emitter breakdown voltage to 45 V while increasing transition frequency to 700 MHz and maximum collector current to 200 mA. This part is not suitable for applications requiring 300 V operation. BF820,215 (Nexperia USA Inc.) maintains 300 V breakdown voltage but reduces maximum collector current to 50 mA and power dissipation to 250 mW. This part is suitable only for low-current applications.

Parts Not Recommended for Direct Substitution

MMBT2484LT1G and MMBT2484LT3G (onsemi) operate at 60 V maximum breakdown voltage, which is insufficient for 300 V applications. These parts are not suitable substitutes for the FMMT497TC.

Frequently Asked Questions (FAQ)

Q: Can FMMT497TA be used as a direct replacement for FMMT497TC?

A: Yes. FMMT497TA is a direct parametric equivalent with identical electrical specifications: 300 V breakdown voltage, 500 mA maximum collector current, 500 mW power dissipation, 75 MHz transition frequency, and matching saturation voltage. The primary difference is product status (Active vs. Obsolete) and packaging format availability. FMMT497TA is available in Cut Tape and Digi-Reel formats.

Q: What is the difference between MMBTA42LT1G and MMBTA42,215?

A: Both parts are manufactured by different suppliers (onsemi vs. Nexperia USA Inc.) and have different maximum collector current ratings. MMBTA42LT1G supports 500 mA maximum collector current with 225 mW power dissipation. MMBTA42,215 supports only 100 mA maximum collector current with 250 mW power dissipation. Both maintain 300 V breakdown voltage. Selection depends on circuit current requirements.

Q: Can PMBTA42,215 be used in non-automotive applications?

A: Yes. PMBTA42,215 is qualified for automotive applications (AEC-Q101) but can be used in non-automotive designs. The automotive qualification indicates additional screening and reliability testing, making it suitable for any application requiring high reliability. However, the 100 mA maximum collector current and 250 mW power dissipation must be verified against circuit requirements.

Q: Why is MMBT2484LT1G not recommended as a substitute?

A: MMBT2484LT1G operates at a maximum collector-emitter breakdown voltage of 60 V, which is insufficient for applications requiring 300 V operation. Using this part in a 300 V circuit would result in device failure. This part is suitable only for low-voltage applications.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), and individual packaging. All parts maintain the SOT-23-3 surface mount package case. Packaging selection should be based on manufacturing process requirements and supply chain logistics.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for commercial and industrial applications.

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

A: Operating temperature ranges vary by manufacturer. FMMT497TA, TSC497CX RFG, MMBTA42LT1G, MMBT2484LT1G, MMBT2484LT3G, and MMBT6429LT1G operate from -55°C to 150°C. MMBTA42,215, PMBTA42,215, PMBTA42,235, and BF820,215 operate to 150°C maximum without specified minimum temperature. Verify temperature range compatibility with application requirements.

Q: Can TSC497CX RFG be used in place of FMMT497TA?

A: Yes. TSC497CX RFG is a direct parametric equivalent with identical electrical specifications to FMMT497TA and FMMT497TC. The primary difference is manufacturer (Taiwan Semiconductor Corporation vs. Diodes Incorporated). Both parts are Active status and available in Tape & Reel packaging. Selection should be based on supply chain availability and manufacturing preference.

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