FMMT591-TP Equivalent & Substitute Parts

Part Overview

The FMMT591-TP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, rated for 60V collector-emitter breakdown voltage and 1A maximum collector current. This surface mount device in SOT-23 packaging is designed for general-purpose switching and amplification applications requiring moderate power dissipation of 500mW. The part is active in production status with RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, manufacturing discontinuation, or application-specific requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	1	A
Voltage - Collector Emitter Breakdown (Max)	60	V
Power - Max	500	mW
Frequency - Transition	150	MHz
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the FMMT591-TP is determined by the following critical parameters:

Mandatory Matching Criteria:

Transistor Type: PNP
Current - Collector (Ic) Max: 1A
Voltage - Collector Emitter Breakdown (Max): 60V
Package / Case: SOT-23-3 (TO-236-3, SC-59)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Power - Max: 500mW or greater
Frequency - Transition: 150MHz or greater
Operating Temperature Range: -55°C to 150°C or equivalent
DC Current Gain (hFE): Variation acceptable within application requirements
Vce Saturation: Lower values indicate improved performance

All identified substitute parts meet the mandatory matching criteria. Variations in power dissipation and transition frequency represent equal or superior electrical capability.

Parameter Comparison

Parameter	FMMT591-TP (Micro Commercial Co)	2STR2160 (STMicroelectronics)	FMMT591QTA (Diodes Incorporated)	DSS5160T-7 (Diodes Incorporated)
Transistor Type	PNP	PNP	PNP	PNP
Current - Collector (Ic) Max	1 A	1 A	1 A	1 A
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	60 V	60 V
Vce Saturation (Max) @ Ib, Ic	600mV @ 100mA, 1A	480mV @ 100mA, 1A	350mV @ 100mA, 1A	340mV @ 100mA, 1A
Current - Collector Cutoff (Max)	100nA	100nA	100nA	100nA
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 500mA, 5V	180 @ 500mA, 2V	100 @ 500mA, 5V	150 @ 500mA, 5V
Power - Max	500 mW	500 mW	500 mW	725 mW
Frequency - Transition	150 MHz	—	150 MHz	150 MHz
Operating Temperature Range	-55°C to 150°C	150°C	-55°C to 150°C	-55°C to 150°C
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

FMMT591QTA (Diodes Incorporated) is the primary substitute for FMMT591-TP applications. This part maintains identical base product numbering (FMMT591), matching electrical specifications including 150MHz transition frequency and -55°C to 150°C operating range. FMMT591QTA carries AEC-Q101 automotive qualification, providing enhanced reliability for demanding environments. Vce saturation is improved at 350mV compared to the original 600mV specification. Packaging is identical SOT-23-3 surface mount. RoHS3 compliance and unlimited moisture sensitivity rating are maintained.

DSS5160T-7 (Diodes Incorporated) serves as an alternative substitute with superior power dissipation capability at 725mW versus the original 500mW rating. This part maintains all critical electrical parameters including 60V breakdown voltage, 1A collector current, and 150MHz transition frequency. Operating temperature range matches the original specification. Vce saturation performance is superior at 340mV. This part is suitable for applications requiring enhanced thermal margin or higher power handling.

2STR2160 (STMicroelectronics) is a functional equivalent meeting all mandatory electrical and mechanical criteria. This part provides improved DC current gain at 180 (minimum) and reduced Vce saturation at 480mV. However, transition frequency specification is not provided in the datasheet. Operating temperature specification indicates maximum junction temperature of 150°C without explicit minimum temperature rating. This part is suitable for applications where transition frequency is not a critical design parameter.

All substitute parts are active in production status with full RoHS3 compliance and REACH unaffected status, ensuring regulatory compliance and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can FMMT591QTA be used as a direct replacement for FMMT591-TP?

A: Yes. FMMT591QTA meets all mandatory electrical and mechanical specifications. Both parts share the same base product number (FMMT591), identical 60V breakdown voltage, 1A collector current rating, 150MHz transition frequency, and SOT-23-3 surface mount packaging. Operating temperature range is identical at -55°C to 150°C. FMMT591QTA provides improved Vce saturation performance at 350mV.

Q: What is the difference between DSS5160T-7 and FMMT591-TP?

A: DSS5160T-7 differs primarily in power dissipation rating (725mW versus 500mW) and Vce saturation (340mV versus 600mV). All other critical parameters are identical: 60V breakdown voltage, 1A collector current, 150MHz transition frequency, -55°C to 150°C operating range, and SOT-23-3 packaging. The higher power rating makes DSS5160T-7 suitable for applications with elevated thermal requirements.

Q: Is 2STR2160 compatible with FMMT591-TP in all applications?

A: 2STR2160 is electrically compatible for applications where transition frequency is not a design-critical parameter. The part meets all mandatory specifications including 60V breakdown voltage, 1A collector current, and SOT-23-3 packaging. However, transition frequency is not specified in the datasheet, and operating temperature minimum is not explicitly stated. Applications requiring guaranteed 150MHz transition frequency or -55°C minimum operating temperature should use FMMT591QTA or DSS5160T-7.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. FMMT591QTA, 2STR2160, and DSS5160T-7 are all ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1), matching the original FMMT591-TP specification.

Q: What is the advantage of FMMT591QTA over the original FMMT591-TP?

A: FMMT591QTA provides AEC-Q101 automotive qualification, indicating enhanced reliability testing and quality assurance. Vce saturation is improved at 350mV compared to 600mV on the original part. All other electrical specifications remain identical, including 150MHz transition frequency and -55°C to 150°C operating range.

Q: Can DSS5160T-7 be used in applications with strict power budget constraints?

A: DSS5160T-7 has a higher power dissipation rating (725mW) than FMMT591-TP (500mW), but this represents maximum allowable dissipation, not typical operating power. Actual power consumption depends on circuit design and operating conditions. DSS5160T-7 is suitable for applications where thermal margin is required or where higher power handling capability is beneficial.

Q: Are there packaging differences between these substitute parts?

A: All parts use identical SOT-23-3 surface mount packaging (also designated TO-236-3 or SC-59). Mechanical compatibility is guaranteed for PCB layout and assembly processes. Packaging differences exist only in supplier delivery format: FMMT591-TP and FMMT591QTA are supplied in Tape & Reel format, while 2STR2160 is available in Cut Tape & Digi-Reel format.

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