FMMT591TC Equivalent & Substitute Parts

Part Overview

The FMMT591TC 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 60 V collector-emitter breakdown voltage with a maximum collector current of 1 A and 500 mW power dissipation. The FMMT591TC 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 ratings, current capacity, and thermal characteristics while accommodating modern active product availability.

Key Parameters

Parameter	FMMT591TC Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	1	A
Power - Max	500	mW
Frequency - Transition	150	MHz
Vce Saturation (Max) @ Ib, Ic	350 mV @ 100 mA, 1 A	—
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 500 mA, 5 V	—
Current - Collector Cutoff (Max)	100	nA
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the FMMT591TC are classified based on electrical parameter compatibility and product status. The substitution logic is determined by the following critical parameters:

Mandatory Matching Parameters:

Transistor Type: PNP
Voltage - Collector Emitter Breakdown (Max): 60 V
Current - Collector (Ic) (Max): 1 A
Package / Case: SOT-23-3
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C (TJ)

Allowable Variation Parameters:

Power - Max: 350 mW to 600 mW (device must support minimum 500 mW application requirements or lower)
Frequency - Transition: 150 MHz or higher
Vce Saturation (Max): 330 mV to 600 mV (saturation voltage variation acceptable within circuit design margins)
DC Current Gain (hFE) (Min): 100 or higher

Substitute parts are grouped into three categories:

Direct Manufacturer Substitutes (Diodes Incorporated): Parts with identical base product number (FMMT591) or equivalent electrical specifications from the same manufacturer.
Cross-Manufacturer Direct Substitutes: Parts from alternative manufacturers (STMicroelectronics, Nexperia) meeting all mandatory parameters with active product status.
Parametric Equivalents: Parts with minor variations in non-critical parameters (power dissipation, saturation voltage) that remain functionally compatible within application tolerances.

Parameter Comparison

Parameter	FMMT591TC	DPBT8105-7	ZXTP2039FTA	FMMT591QTA	FMMT591TA	2STR2160	PBSS5160T,215
Manufacturer	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	Diodes Inc.	STMicroelectronics	Nexperia USA Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	60 V	60 V	60 V	60 V	60 V
Current - Collector (Ic) (Max)	1 A	1 A	1 A	1 A	1 A	1 A	1 A
Power - Max	500 mW	600 mW	350 mW	500 mW	500 mW	500 mW	400 mW
Frequency - Transition	150 MHz	150 MHz	150 MHz	150 MHz	150 MHz	—	220 MHz
Vce Saturation (Max) @ Ib, Ic	350 mV @ 100 mA, 1 A	600 mV @ 100 mA, 1 A	600 mV @ 100 mA, 1 A	350 mV @ 100 mA, 1 A	350 mV @ 100 mA, 1 A	480 mV @ 100 mA, 1 A	330 mV @ 100 mA, 1 A
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 500 mA, 5 V	100 @ 500 mA, 5 V	100 @ 500 mA, 5 V	100 @ 500 mA, 5 V	100 @ 500 mA, 5 V	180 @ 500 mA, 2 V	150 @ 500 mA, 5 V
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA	100 nA	100 nA	100 nA	100 nA
Operating Temperature Range	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C	—	—
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: FMMT591TA

The FMMT591TA is the preferred substitute for the obsolete FMMT591TC. This part is manufactured by Diodes Incorporated with active product status and maintains identical electrical specifications including 60 V breakdown voltage, 1 A collector current, 500 mW power dissipation, and 350 mV saturation voltage. The FMMT591TA is available in Cut Tape and Digi-Reel packaging with 37,261 pieces in stock. All compliance certifications match the original part: ROHS3 compliant, MSL 1, REACH unaffected, and EAR99 classification.

Secondary Recommendation: FMMT591QTA

The FMMT591QTA provides identical electrical performance to the FMMT591TC with the addition of automotive-grade qualification (AEC-Q101) and active product status. This part is suitable for applications requiring automotive-level reliability. Inventory availability is 8,348 pieces in Tape & Reel packaging. All electrical parameters and compliance certifications are equivalent to the original part.

Alternative Recommendation: DPBT8105-7

The DPBT8105-7 from Diodes Incorporated is an active substitute with matching voltage, current, and package specifications. This part features 600 mW power dissipation (compared to 500 mW in the original) and 600 mV saturation voltage. The higher power rating provides additional thermal margin. Inventory availability is 101,100 pieces in Tape & Reel packaging. This part is suitable for applications where increased power dissipation capability is beneficial.

Cross-Manufacturer Alternative: 2STR2160

The 2STR2160 from STMicroelectronics meets all mandatory electrical parameters with 60 V breakdown voltage, 1 A collector current, and 500 mW power dissipation. This part features 480 mV saturation voltage and higher DC current gain (180 minimum). Frequency-transition specification is not provided. Inventory availability is 191,100 pieces. This part is suitable for applications where cross-manufacturer sourcing is required.

Cross-Manufacturer Alternative: PBSS5160T,215

The PBSS5160T,215 from Nexperia USA Inc. is an active substitute meeting all mandatory parameters with 60 V breakdown voltage and 1 A collector current. This part features 220 MHz transition frequency (higher than the original 150 MHz), 400 mW power dissipation, and 330 mV saturation voltage. Inventory availability is 9,596 pieces in Tape & Reel packaging. This part is suitable for applications requiring higher frequency performance.

Not Recommended: ZXTP2039FTA

The ZXTP2039FTA from Diodes Incorporated meets all mandatory electrical parameters but features 350 mW power dissipation, which is below the original 500 mW specification. This part is suitable only for applications with reduced power requirements and should not be used as a direct replacement without thermal analysis.

Frequently Asked Questions (FAQ)

Q: Can I use FMMT591TA as a direct replacement for FMMT591TC?

A: Yes. The FMMT591TA is a direct replacement for the obsolete FMMT591TC. Both parts share identical electrical specifications including 60 V breakdown voltage, 1 A maximum collector current, 500 mW power dissipation, 350 mV saturation voltage, and 150 MHz transition frequency. The FMMT591TA is active and available in production quantities.

Q: What is the difference between FMMT591TA and FMMT591QTA?

A: The FMMT591QTA includes automotive-grade qualification (AEC-Q101) and is designated for automotive applications. Electrical specifications are identical. The FMMT591TA is the standard industrial-grade version. Selection depends on application requirements.

Q: Can I substitute DPBT8105-7 for FMMT591TC?

A: Yes, with consideration for power dissipation differences. The DPBT8105-7 has 600 mW maximum power rating compared to 500 mW in the original, and 600 mV saturation voltage compared to 350 mV. The higher saturation voltage may affect circuit performance in switching applications. Thermal analysis is not required due to higher power rating.

Q: Why does 2STR2160 have a different DC current gain specification?

A: The 2STR2160 specifies DC current gain at different test conditions (500 mA, 2 V) compared to the FMMT591TC (500 mA, 5 V). The minimum gain of 180 at 2 V is higher than the 100 minimum at 5 V for the original part. This difference reflects manufacturer test methodology and does not prevent substitution.

Q: Is PBSS5160T,215 compatible with the original FMMT591TC?

A: Yes. The PBSS5160T,215 meets all mandatory electrical parameters with 60 V breakdown voltage and 1 A collector current. The 220 MHz transition frequency is higher than the original 150 MHz, providing improved high-frequency performance. The 400 mW power rating is lower than the original 500 mW and should be considered in thermal design.

Q: What packaging options are available for substitutes?

A: All substitute parts are available in SOT-23-3 surface mount package. Packaging formats vary: FMMT591TA is available in Cut Tape and Digi-Reel; FMMT591QTA, DPBT8105-7, and PBSS5160T,215 are available in Tape & Reel; 2STR2160 is available in Cut Tape and Digi-Reel. Selection depends on production volume and assembly requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level), REACH unaffected status, and EAR99 export classification. Compliance certifications match the original FMMT591TC.

Q: Can I use ZXTP2039FTA in my design?

A: The ZXTP2039FTA is electrically compatible but features 350 mW power dissipation compared to 500 mW in the original. This part is suitable only for applications with confirmed power requirements below 350 mW. Thermal analysis is required to ensure adequate heat dissipation in your specific circuit.

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