3STR1630 Equivalent & Substitute Parts

Part Overview

The 3STR1630 is an NPN bipolar junction transistor manufactured by STMicroelectronics, designed for general-purpose switching and amplification applications. This device features a 30 V collector-emitter breakdown voltage, 6 A maximum collector current, and 500 mW power dissipation in a surface mount SOT-23-3 package. The part 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)	30	V
Current - Collector (Ic) (Max)	6	A
Power - Max	500	mW
Frequency - Transition	100	MHz
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Operating Temperature (Max)	150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 3STR1630 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN configuration required
Voltage - Collector Emitter Breakdown (Max): Minimum 30 V
Current - Collector (Ic) (Max): Minimum 6 A for direct replacement; lower current ratings acceptable for reduced-load applications
Power - Max: Minimum 500 mW for equivalent thermal performance
Package / Case: SOT-23-3 or compatible surface mount package
Mounting Type: Surface Mount
Operating Temperature: 150°C maximum junction temperature

Secondary Compatibility Parameters:

Frequency - Transition: 100 MHz minimum for signal integrity
RoHS Compliance: ROHS3 Compliant preferred for regulatory alignment
Moisture Sensitivity Level: MSL 1 (Unlimited) preferred for handling consistency

Substitute parts are grouped into two categories:

Category A - Full Current Replacement (6 A capable): Parts meeting or exceeding the 6 A collector current specification with 30 V or higher breakdown voltage. These provide direct functional replacement without circuit redesign.

Category B - Reduced Current Substitutes (1 A to 3 A range): Parts with lower maximum collector current but matching 30 V breakdown voltage and 500 mW power dissipation. These are suitable for applications where the full 6 A capability is not required, reducing thermal stress and improving reliability in current-limited circuits.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) [A]	Vce Breakdown (Max) [V]	Power (Max) [mW]	Frequency [MHz]	Package	Status	RoHS
3STR1630	STMicroelectronics	6	30	500	100	SOT-23-3	Obsolete	ROHS3
2SC2411-P-TP	Micro Commercial Co	0.5	32	200	250	SOT-23	Active	—
2SC2411KT146Q	Rohm Semiconductor	0.5	32	200	250	SOT-23-3	Active	ROHS3
2SC2411KT146R	Rohm Semiconductor	0.5	32	200	250	SOT-23-3	Active	ROHS3
2SC5916TLQ	Rohm Semiconductor	2	30	500	250	SC-96	Active	ROHS3
2SD1781KT146Q	Rohm Semiconductor	0.8	32	200	150	SOT-23-3	Active	ROHS3
2SD1781KT146R	Rohm Semiconductor	0.8	32	200	150	SOT-23-3	Active	ROHS3
2SD2657TL	Rohm Semiconductor	1.5	30	1000	300	SC-96	Active	ROHS3
2SD2671TL	Rohm Semiconductor	2	30	1000	280	SC-96	Active	ROHS3
2SD2673TL	Rohm Semiconductor	3	30	1000	200	SC-96	Active	ROHS3
2SD2675TL	Rohm Semiconductor	1	30	500	320	SC-96	Active	ROHS3

Engineering Selection Recommendations

For Direct Functional Replacement (SOT-23-3 Package, 6 A Capability):

No active substitute parts are available that match both the 6 A collector current specification and the SOT-23-3 package form factor. The 3STR1630 represents a high-current density design in a compact surface mount package. Direct replacement within the same package is not available from the provided substitute list.

For Reduced-Current Applications (SOT-23-3 Package, ≤1 A):

The following parts provide active product status with SOT-23-3 package compatibility:

2SC2411KT146Q (Rohm Semiconductor): 500 mA maximum collector current, 32 V breakdown voltage, 250 MHz transition frequency. ROHS3 compliant with MSL 1. Suitable for low-current signal switching applications.
2SC2411KT146R (Rohm Semiconductor): Identical electrical specifications to 2SC2411KT146Q with higher inventory availability (75,100 pcs). Preferred for production volume requirements.
2SD1781KT146Q and 2SD1781KT146R (Rohm Semiconductor): 800 mA maximum collector current, 32 V breakdown voltage, 150 MHz transition frequency. ROHS3 compliant with MSL 1. Suitable for moderate-current applications requiring higher current handling than 2SC2411 variants.

For Increased Power Dissipation (SC-96 Package, 1 W Power Rating):

The following parts provide enhanced thermal performance with 1 W power dissipation in SC-96 package:

2SD2675TL (Rohm Semiconductor): 1 A maximum collector current, 30 V breakdown voltage, 320 MHz transition frequency, 500 mW power rating. ROHS3 compliant. Closest electrical match to 3STR1630 in terms of voltage and power specifications.
2SD2657TL (Rohm Semiconductor): 1.5 A maximum collector current, 30 V breakdown voltage, 300 MHz transition frequency, 1 W power rating. ROHS3 compliant. Suitable for applications requiring higher current than 2SD2675TL.
2SD2671TL (Rohm Semiconductor): 2 A maximum collector current, 30 V breakdown voltage, 280 MHz transition frequency, 1 W power rating. ROHS3 compliant. Intermediate current option.
2SD2673TL (Rohm Semiconductor): 3 A maximum collector current, 30 V breakdown voltage, 200 MHz transition frequency, 1 W power rating. ROHS3 compliant. Highest current option in SC-96 package, approaching 6 A capability.
2SC5916TLQ (Rohm Semiconductor): 2 A maximum collector current, 30 V breakdown voltage, 250 MHz transition frequency, 500 mW power rating. ROHS3 compliant. Alternative 2 A option.

Selection Criteria Summary:

All recommended substitutes maintain ROHS3 compliance and MSL 1 moisture sensitivity rating. Product status is active for all recommended parts, ensuring long-term availability. Voltage specifications (30 V or 32 V breakdown) are compatible with the original 3STR1630 design. Selection between SOT-23-3 and SC-96 package options depends on circuit board layout constraints and thermal management requirements. SC-96 package variants provide superior thermal performance through increased package size and enhanced heat dissipation characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 2SC2411KT146R directly replace the 3STR1630 in all applications?

A: No. The 2SC2411KT146R is rated for 500 mA maximum collector current, while the 3STR1630 is rated for 6 A. Direct replacement is only suitable for applications where the circuit current requirement does not exceed 500 mA. For higher-current applications, use 2SD2673TL (3 A) or evaluate circuit redesign.

Q: What is the difference between 2SC2411KT146Q and 2SC2411KT146R?

A: Both parts have identical electrical specifications (500 mA, 32 V, 250 MHz, 200 mW). The difference is in packaging format and inventory availability. 2SC2411KT146R has significantly higher stock (75,100 pcs vs. 17,920 pcs) and is preferred for production orders.

Q: Why do the SC-96 package substitutes have higher power ratings (1 W vs. 500 mW)?

A: The SC-96 package provides a larger physical footprint and improved thermal coupling to the PCB, enabling higher power dissipation. This is a design advantage, not a limitation. Circuits designed for 500 mW operation will function correctly with 1 W-rated devices.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts are ROHS3 compliant. The 2SC2411-P-TP from Micro Commercial Co does not specify RoHS status in the provided data and should be verified before use in RoHS-regulated applications.

Q: What is the significance of the MSL 1 (Unlimited) rating?

A: MSL 1 indicates unlimited shelf life without moisture baking requirements. All recommended substitutes carry this rating, matching the original 3STR1630 specification. This simplifies inventory management and reduces handling complexity.

Q: Can I use 2SD2673TL as a direct replacement for 3STR1630?

A: The 2SD2673TL provides 3 A maximum collector current (50% of the 3STR1630 rating) with matching 30 V breakdown voltage and superior 1 W power dissipation. It is suitable for applications where 3 A current is sufficient. The SC-96 package differs from SOT-23-3, requiring PCB layout modification. Verify circuit current requirements before substitution.

Q: What is the difference between transition frequency specifications (100 MHz vs. 250 MHz)?

A: Transition frequency (fT) indicates the frequency at which transistor current gain drops to unity. Higher transition frequency provides better high-frequency performance. Substitutes with 250 MHz or higher fT are suitable for applications originally designed for 100 MHz fT. Lower fT substitutes should be evaluated for frequency-dependent circuit performance.

Q: Is the 2SC5916TLQ suitable for replacing 3STR1630?

A: The 2SC5916TLQ provides 2 A maximum collector current with matching 30 V breakdown voltage and 500 mW power dissipation. It is suitable for applications where 2 A current is sufficient. The SC-96 package requires PCB layout modification from SOT-23-3. This part is an intermediate option between low-current SOT-23-3 variants and higher-current SC-96 options.

Q: Why is 2SD2675TL recommended as the closest match?

A: The 2SD2675TL matches the original 3STR1630 in three critical parameters: 30 V breakdown voltage, 500 mW power dissipation, and 1 A collector current capability. While current rating is reduced from 6 A to 1 A, the voltage and power specifications are identical. This part is recommended for applications where 1 A current is sufficient and thermal performance is critical.

Q: Can multiple lower-current transistors be paralleled to achieve 6 A capability?

A: Paralleling transistors is not addressed in the provided technical specifications and falls outside the scope of direct substitution analysis. Circuit design modifications of this nature require detailed thermal and current-sharing analysis beyond the parameter comparison provided.

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