2STR1160 Equivalent & Substitute Parts

Part Overview

The 2STR1160 is an NPN bipolar junction transistor manufactured by STMicroelectronics, designed for general-purpose switching and amplification applications. The device is rated for 60 V collector-emitter breakdown voltage, 1 A maximum collector current, and 500 mW power dissipation in a surface mount SOT-23-3 package. The 2STR1160 is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility within the specified parameter ranges while offering active product status and continued availability.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	1	A
Power - Max	500	mW
Vce Saturation (Max) @ Ib, Ic	430 mV @ 100 mA, 1 A	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	180 @ 500 mA, 2 V	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Operating Temperature (TJ)	150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the 2STR1160 are classified into two categories based on electrical parameter compatibility:

Direct Electrical Equivalents (Full Parameter Match): Parts that meet or exceed all critical electrical specifications of the 2STR1160, including 60 V collector-emitter breakdown voltage, 1 A maximum collector current, and 500 mW power rating. These parts maintain the same functional performance envelope and are suitable for direct replacement in existing circuit designs.

Functional Equivalents (Reduced Parameter Ratings): Parts that operate within the same voltage and current ranges but with reduced power dissipation or different saturation characteristics. These parts are suitable for applications where the full 500 mW power rating is not required, or where lower saturation voltage is beneficial.

Key Substitution Criteria:

Transistor Type: NPN (mandatory)
Voltage - Collector Emitter Breakdown (Max): ≥ 60 V
Current - Collector (Ic) (Max): ≥ 1 A
Package / Case: TO-236-3, SC-59, SOT-23-3 (mandatory for form-fit-function compatibility)
Mounting Type: Surface Mount (mandatory)
RoHS Status: ROHS3 Compliant (mandatory)
Moisture Sensitivity Level (MSL): 1 (Unlimited) (mandatory)
Product Status: Active (required for ongoing availability)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Collector Emitter Breakdown (Max) [V]	Current - Collector (Ic) (Max) [A]	Power - Max [mW]	Vce Saturation (Max) @ Ib, Ic [mV]	DC Current Gain (hFE) (Min) @ Ic, Vce	Package / Case	Product Status	Operating Temperature (TJ) [°C]
2STR1160	STMicroelectronics	60	1	500	430 @ 100 mA, 1 A	180 @ 500 mA, 2 V	TO-236-3, SC-59, SOT-23-3	Obsolete	150
FMMT491TC	Diodes Incorporated	60	1	500	250 @ 100 mA, 1 A	100 @ 500 mA, 5 V	TO-236-3, SC-59, SOT-23-3	Active	-55 to 150
CMPT3820 TR PBFREE	Central Semiconductor Corp	60	1	350	280 @ 100 mA, 1 A	200 @ 500 mA, 5 V	TO-236-3, SC-59, SOT-23-3	Active	-65 to 150
CMPT491E TR PBFREE	Central Semiconductor Corp	60	1	350	400 @ 100 mA, 1 A	200 @ 500 mA, 5 V	TO-236-3, SC-59, SOT-23-3	Active	-65 to 150
DNBT8105-7	Diodes Incorporated	60	1	600	500 @ 100 mA, 1 A	100 @ 500 mA, 5 V	TO-236-3, SC-59, SOT-23-3	Active	-55 to 150
MMBT3904LT1G	onsemi	40	0.2	300	300 @ 5 mA, 50 mA	100 @ 10 mA, 1 V	TO-236-3, SC-59, SOT-23-3	Active	-55 to 150
MMBT3904LT3G	onsemi	40	0.2	300	300 @ 5 mA, 50 mA	100 @ 10 mA, 1 V	TO-236-3, SC-59, SOT-23-3	Active	-55 to 150
MMBTA06LT1G	onsemi	80	0.5	225	250 @ 10 mA, 100 mA	100 @ 100 mA, 1 V	TO-236-3, SC-59, SOT-23-3	Active	-55 to 150
MMBTA06LT3G	onsemi	80	0.5	225	250 @ 10 mA, 100 mA	100 @ 100 mA, 1 V	TO-236-3, SC-59, SOT-23-3	Active	-55 to 150
MMBTA42LT1G	onsemi	300	0.5	225	500 @ 2 mA, 20 mA	40 @ 30 mA, 10 V	TO-236-3, SC-59, SOT-23-3	Active	-55 to 150
MMBTA42LT3G	onsemi	300	0.5	225	500 @ 2 mA, 20 mA	40 @ 30 mA, 10 V	TO-236-3, SC-59, SOT-23-3	Active	-55 to 150

Engineering Selection Recommendations

Direct Replacement (Full Electrical Equivalence):

The FMMT491TC (Diodes Incorporated) is the primary direct replacement for the 2STR1160. This part maintains the 60 V collector-emitter breakdown voltage and 1 A maximum collector current specifications. The FMMT491TC offers improved saturation characteristics (250 mV versus 430 mV) and is classified as active product status with ROHS3 compliance and unlimited moisture sensitivity level. The extended operating temperature range (-55°C to 150°C) provides additional thermal margin compared to the 2STR1160.

The DNBT8105-7 (Diodes Incorporated) provides an alternative direct replacement with identical voltage and current ratings. This part offers enhanced power dissipation capability (600 mW versus 500 mW), making it suitable for applications requiring additional thermal headroom. The DNBT8105-7 maintains active product status and full compliance certifications.

Functional Equivalents (Reduced Power Rating):

The CMPT3820 TR PBFREE and CMPT491E TR PBFREE (Central Semiconductor Corp) maintain the 60 V and 1 A specifications but with reduced power dissipation (350 mW). These parts are suitable for applications where the full 500 mW power rating is not required. Both parts are active and ROHS3 compliant with extended operating temperature ranges (-65°C to 150°C).

Limited Substitution (Reduced Electrical Ratings):

The MMBT3904LT1G, MMBT3904LT3G, MMBTA06LT1G, MMBTA06LT3G, MMBTA42LT1G, and MMBTA42LT3G are not direct electrical equivalents due to reduced voltage or current ratings. These parts are listed as substitutes only for applications where the reduced specifications are acceptable. The MMBT3904 series (40 V, 200 mA) and MMBTA06 series (80 V, 500 mA) are suitable only for low-power applications. The MMBTA42 series (300 V, 500 mA) is suitable only for high-voltage, low-current applications. All parts maintain active product status and full compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can the FMMT491TC be used as a direct replacement for the 2STR1160 in all applications?

A: The FMMT491TC meets all critical electrical specifications for the 2STR1160, including 60 V collector-emitter breakdown voltage, 1 A maximum collector current, and 500 mW power dissipation. The identical SOT-23-3 package ensures form-fit-function compatibility. The FMMT491TC is suitable for direct replacement in existing circuit designs without modification.

Q: What is the difference between CMPT3820 TR PBFREE and CMPT491E TR PBFREE?

A: Both parts maintain the 60 V and 1 A specifications required for 2STR1160 substitution. The primary difference is saturation voltage: CMPT3820 TR PBFREE exhibits 280 mV saturation voltage, while CMPT491E TR PBFREE exhibits 400 mV saturation voltage. Selection depends on circuit requirements for saturation characteristics. Both parts are active and ROHS3 compliant.

Q: Why are MMBT3904 and MMBTA06 series listed as substitutes if they have lower current ratings?

A: These parts are listed as substitutes only for applications where the reduced current specifications (200 mA and 500 mA respectively) are acceptable. They are not suitable for applications requiring the full 1 A collector current of the 2STR1160. Circuit analysis is required to determine compatibility.

Q: Does the DNBT8105-7 offer any advantages over the FMMT491TC?

A: The DNBT8105-7 provides 600 mW power dissipation compared to 500 mW for the FMMT491TC. This additional power rating provides thermal margin in applications approaching the power dissipation limits. Both parts maintain identical voltage and current specifications and are suitable for direct replacement.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant and maintain unlimited moisture sensitivity level (MSL 1). All parts are suitable for applications requiring environmental compliance certifications.

Q: What is the significance of the SOT-23-3 package specification?

A: The SOT-23-3 package (also designated TO-236-3 or SC-59) is a three-terminal surface mount package. All substitute parts maintain this identical package specification, ensuring mechanical compatibility with existing printed circuit board layouts and assembly processes. Package compatibility is mandatory for direct substitution.

Q: Can MMBTA42LT1G or MMBTA42LT3G be used in place of the 2STR1160?

A: The MMBTA42 series is not suitable for direct replacement due to significantly different electrical specifications. While these parts maintain the 1 A current rating, the 300 V collector-emitter breakdown voltage and 225 mW power dissipation represent a different device class designed for high-voltage, low-power applications. Circuit redesign would be required for substitution.

Q: What is the difference between FMMT491TC and DNBT8105-7 in terms of product availability?

A: Both parts are classified as active product status. The DNBT8105-7 shows significantly higher inventory (110,300 pcs) compared to FMMT491TC (25,400 pcs), indicating greater availability for high-volume procurement. Selection may depend on supply chain requirements and lead time considerations.

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