FMMT597TC Equivalent & Substitute Parts

Part Overview

The FMMT597TC is a PNP 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 200 mA and 500 mW power dissipation. The FMMT597TC 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 performance characteristics suitable for specific application requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	300	V
Current - Collector (Ic) (Max)	200	mA
Power - Max	500	mW
Frequency - Transition	75	MHz
Vce Saturation (Max) @ Ib, Ic	250mV @ 20mA, 100mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 50mA, 10V	—
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the FMMT597TC is determined by the following critical parameters: transistor type (PNP), collector-emitter breakdown voltage (300 V minimum), maximum collector current (200 mA minimum), power dissipation capability (500 mW minimum), transition frequency (75 MHz minimum), saturation voltage characteristics, DC current gain, operating temperature range (-55°C to 150°C), surface mount packaging (SOT-23-3 compatible), and automotive-grade qualification (AEC-Q101).

Parametric equivalents maintain all electrical specifications and packaging identical to the FMMT597TC. Functional substitutes provide alternative performance characteristics while remaining compatible with the same package footprint and mounting technology. Substitutes with higher collector current ratings, voltage ratings, or frequency capabilities are suitable for applications where the FMMT597TC specifications exceed minimum requirements. Substitutes with reduced ratings require application-level verification that the lower specifications remain adequate for the intended circuit function.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce(br) V	Power mW	fT MHz	hFE (Min)	Package	Grade	AEC-Q101
FMMT597TC	Diodes Incorporated	Obsolete	200	300	500	75	100	SOT-23-3	Automotive	Yes
FMMT597TA	Diodes Incorporated	Active	200	300	500	75	100	SOT-23-3	Automotive	Yes
2SA1721RTE85LF	Toshiba Semiconductor and Storage	Active	100	300	150	50	30	SOT-23-3	—	—
BF821,215	Nexperia USA Inc.	Active	50	300	250	60	50	SOT-23-3	Automotive	Yes
MMBT6520LT1G	onsemi	Active	500	350	225	200	20	SOT-23-3	—	—
MMBTA92,215	Nexperia USA Inc.	Active	100	300	250	50	25	SOT-23-3	Automotive	Yes
MMBTA92LT1G	onsemi	Active	500	300	300	50	25	SOT-23-3	—	—
NSVMMBT6520LT1G	onsemi	Active	500	350	225	200	20	SOT-23-3	Automotive	Yes
NSVMSB92T1G	onsemi	Active	—	300	—	—	—	SOT-23-3	—	—
PMBTA92,215	Nexperia USA Inc.	Active	100	300	250	50	25	SOT-23-3	Automotive	Yes

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement)

FMMT597TA from Diodes Incorporated is the parametric equivalent to FMMT597TC. This part maintains identical electrical specifications, package configuration, and automotive qualification. FMMT597TA is active in production with substantial inventory availability (32,400 pcs), making it the primary replacement for obsolete FMMT597TC applications. Both parts are ROHS3 compliant, AEC-Q101 qualified, and suitable for automotive-grade applications.

Automotive-Grade Substitutes (AEC-Q101 Qualified)

For applications where collector current requirements do not exceed 100 mA, MMBTA92,215 and PMBTA92,215 from Nexperia USA Inc. provide active alternatives with automotive qualification. Both parts maintain 300 V collector-emitter breakdown voltage and are AEC-Q101 qualified. These substitutes operate at reduced maximum collector current (100 mA) and power dissipation (250 mW) compared to FMMT597TC specifications.

BF821,215 from Nexperia USA Inc. is an automotive-grade substitute suitable for applications with maximum collector current requirements of 50 mA. This part maintains 300 V breakdown voltage and AEC-Q101 qualification.

NSVMMBT6520LT1G from onsemi provides an automotive-grade substitute with enhanced performance characteristics: 500 mA maximum collector current, 350 V collector-emitter breakdown voltage, and 200 MHz transition frequency. This part is AEC-Q101 qualified and suitable for applications requiring higher current capacity or voltage margin.

Non-Automotive Substitutes

MMBT6520LT1G and MMBTA92LT1G from onsemi are active substitutes without automotive qualification. MMBT6520LT1G offers 500 mA collector current and 350 V breakdown voltage with 200 MHz transition frequency. MMBTA92LT1G provides 500 mA collector current at 300 V breakdown voltage. These parts are suitable for non-automotive applications where AEC-Q101 qualification is not required.

2SA1721RTE85LF from Toshiba Semiconductor and Storage is an active substitute with reduced specifications: 100 mA maximum collector current, 150 mW power dissipation, and 50 MHz transition frequency. This part lacks automotive qualification and is suitable only for applications where these reduced ratings are acceptable.

Frequently Asked Questions (FAQ)

Q: Can FMMT597TA directly replace FMMT597TC in all applications?

A: Yes. FMMT597TA is a parametric equivalent with identical electrical specifications, package configuration, and automotive qualification. The only difference is product status (active versus obsolete) and packaging format (Tape & Reel versus bulk). Direct substitution is appropriate for all FMMT597TC applications.

Q: What is the primary difference between FMMT597TC and MMBTA92,215?

A: MMBTA92,215 has a maximum collector current rating of 100 mA compared to FMMT597TC's 200 mA. Both maintain 300 V collector-emitter breakdown voltage and are automotive-grade AEC-Q101 qualified. MMBTA92,215 is suitable for applications where collector current does not exceed 100 mA.

Q: Are MMBT6520LT1G and NSVMMBT6520LT1G interchangeable?

A: Both parts have identical electrical specifications and SOT-23-3 packaging. The primary difference is that NSVMMBT6520LT1G is automotive-grade AEC-Q101 qualified, while MMBT6520LT1G is not. For automotive applications, NSVMMBT6520LT1G is required. For non-automotive applications, either part is acceptable.

Q: Can I use MMBTA92LT1G as a substitute for FMMT597TC?

A: MMBTA92LT1G has a maximum collector current of 500 mA and power dissipation of 300 mW, both exceeding FMMT597TC specifications. The part maintains 300 V collector-emitter breakdown voltage and SOT-23-3 packaging. However, MMBTA92LT1G lacks automotive qualification. This substitute is suitable for non-automotive applications where the higher current capacity is acceptable.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 qualification indicates the part meets automotive industry reliability and quality standards. FMMT597TC and its automotive-grade substitutes (FMMT597TA, MMBTA92,215, PMBTA92,215, BF821,215, NSVMMBT6520LT1G) are AEC-Q101 qualified and suitable for automotive applications. Non-qualified substitutes are restricted to non-automotive use.

Q: Why does NSVMSB92T1G have incomplete specifications in the comparison table?

A: NSVMSB92T1G specifications were not fully provided in the source data. Only transistor type (PNP), collector-emitter breakdown voltage (300 V), and package information (SOT-23-3) are confirmed. Complete electrical specifications for this part are not available for detailed comparison.

Q: Can BF821,215 replace FMMT597TC in high-current applications?

A: No. BF821,215 has a maximum collector current rating of 50 mA, which is insufficient for applications requiring the FMMT597TC's 200 mA capability. BF821,215 is suitable only for applications with collector current requirements not exceeding 50 mA.

Q: What packaging formats are available for equivalent parts?

A: FMMT597TC is supplied in bulk packaging. FMMT597TA (the parametric equivalent) is available in Tape & Reel format. Most substitute parts are available in Cut Tape or Tape & Reel packaging. Verify packaging format compatibility with assembly equipment before procurement.

Q: Is MMBT6520LT1G suitable for automotive applications?

A: MMBT6520LT1G is not AEC-Q101 qualified and is not suitable for automotive applications. For automotive use, NSVMMBT6520LT1G (the automotive-qualified equivalent) must be used instead.

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