2STR1230 Equivalent & Substitute Parts

Part Overview

The 2STR1230 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, 1.5 A maximum collector current, and 500 mW power dissipation in a surface mount SOT-23-3 package. The 2STR1230 is classified as obsolete, necessitating identification of active substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	30	V
Current - Collector (Ic) (Max)	1.5	A
Power - Max	500	mW
Vce Saturation (Max) @ Ib, Ic	850mV @ 200mA, 2A	—
DC Current Gain (hFE) (Min) @ Ic, Vce	180 @ 500mA, 2V	—
Current - Collector Cutoff (Max)	100	nA
Operating Temperature (Max)	150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 2STR1230 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN configuration required
Voltage Rating: Collector-emitter breakdown voltage must equal or exceed 30 V
Current Rating: Maximum collector current must equal or exceed 1.5 A
Power Dissipation: Maximum power rating must equal or exceed 500 mW
Package: Surface mount SOT-23-3 (TO-236-3, SC-59) or compatible package
Mounting Type: Surface mount configuration

Secondary Compatibility Factors:

Operating temperature range must support 150°C maximum junction temperature
RoHS3 compliance and MSL rating for manufacturing compatibility
DC current gain and saturation voltage characteristics for circuit performance

Substitute parts are grouped into two categories based on package type and power rating:

Category A - SOT-23-3 Package (200 mW Power Rating): Parts 2SC2411-P-TP, 2SC2411KT146Q, and 2SC2411KT146R operate at reduced power levels (200 mW) and lower current ratings (500 mA maximum). These parts are suitable for applications where the 1.5 A current requirement can be met through parallel configuration or where actual circuit current demands are lower than the 2STR1230 maximum rating.

Category B - SOT-23-3 Package (200 mW Power Rating, Higher Current): Parts 2SD1781KT146Q and 2SD1781KT146R support 800 mA collector current with 200 mW power dissipation, providing intermediate current capability between low-current and high-current options.

Category C - SOT-23-3 Package (Direct Electrical Match): Part 2SD2657KT146 matches the 2STR1230 with 1.5 A collector current, 30 V voltage rating, and 200 mW power dissipation in SOT-23-3 package, providing the closest electrical equivalent.

Category D - Larger Package Options (1 W Power Rating): Parts 2SD2657TL, 2SD2671TL, and 2SD2673TL utilize SC-96 (TSMT3) packages with 1 W power dissipation, supporting 1.5 A, 2 A, and 3 A collector currents respectively at 30 V rating. These parts accommodate higher power dissipation requirements but require PCB layout modifications due to different package footprint.

Category E - Higher Voltage Rating: Part 2SC5866TLR operates at 60 V collector-emitter breakdown voltage with 2 A collector current and 500 mW power dissipation in SC-96 package, suitable for applications requiring higher voltage margin.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) [A]	Vce(br) [V]	Power [mW]	Package	Status	hFE (Min)
2STR1230	STMicroelectronics	1.5	30	500	SOT-23-3	Obsolete	180
2SC2411-P-TP	Micro Commercial Co	0.5	32	200	SOT-23	Active	82
2SC2411KT146Q	Rohm Semiconductor	0.5	32	200	SOT-23-3	Active	120
2SC2411KT146R	Rohm Semiconductor	0.5	32	200	SOT-23-3	Active	120
2SC5866TLR	Rohm Semiconductor	2.0	60	500	SC-96	Active	120
2SD1781KT146Q	Rohm Semiconductor	0.8	32	200	SOT-23-3	Active	120
2SD1781KT146R	Rohm Semiconductor	0.8	32	200	SOT-23-3	Active	180
2SD2657KT146	Rohm Semiconductor	1.5	30	200	SOT-23-3	Active	270
2SD2657TL	Rohm Semiconductor	1.5	30	1000	SC-96	Active	270
2SD2671TL	Rohm Semiconductor	2.0	30	1000	SC-96	Active	270
2SD2673TL	Rohm Semiconductor	3.0	30	1000	SC-96	Active	270

Engineering Selection Recommendations

Direct Replacement (Same Package, Same Electrical Class):

The 2SD2657KT146 manufactured by Rohm Semiconductor provides the closest electrical match to the 2STR1230. Both devices feature 1.5 A maximum collector current, 30 V collector-emitter breakdown voltage, and SOT-23-3 surface mount package. The 2SD2657KT146 is active in production status with ROHS3 compliance and MSL 1 rating, ensuring manufacturing compatibility. The primary difference is reduced power dissipation (200 mW versus 500 mW), which is acceptable for applications where actual power dissipation remains below 200 mW. This part requires no PCB layout modification.

Higher Power Dissipation Requirement:

For applications requiring the full 500 mW power dissipation capability, the 2SD2657TL offers 1.5 A collector current at 30 V in an SC-96 (TSMT3) package with 1 W power rating. This part maintains electrical compatibility while providing enhanced thermal performance. PCB layout modification is required to accommodate the different package footprint. The 2SD2657TL is active in production with ROHS3 compliance and MSL 1 rating.

Higher Current Requirement:

The 2SD2671TL and 2SD2673TL support 2 A and 3 A collector currents respectively at 30 V in SC-96 packages with 1 W power dissipation. These parts are suitable when circuit requirements exceed 1.5 A. Both devices are active in production with full compliance certifications.

Higher Voltage Margin Requirement:

The 2SC5866TLR provides 60 V collector-emitter breakdown voltage with 2 A collector current and 500 mW power dissipation in SC-96 package. This part is selected when higher voltage margin is required for circuit protection. The part is active in production with ROHS3 compliance.

Lower Current Applications:

The 2SC2411KT146Q, 2SC2411KT146R, and 2SD1781KT146Q/R series support reduced collector currents (500 mA to 800 mA) with 32 V voltage rating in SOT-23-3 packages. These parts are suitable for applications where actual circuit current demands are significantly lower than 1.5 A. All parts are active in production with ROHS3 compliance and MSL 1 rating.

Frequently Asked Questions (FAQ)

Q: Can the 2SC2411KT146Q directly replace the 2STR1230 in all applications?

A: The 2SC2411KT146Q operates at 500 mA maximum collector current, which is one-third the 2STR1230 rating of 1.5 A. Direct replacement is limited to applications where actual circuit current does not exceed 500 mA. For circuits requiring 1.5 A capability, the 2SD2657KT146 is the appropriate substitute.

Q: What is the difference between 2SD2657KT146 and 2SD2657TL?

A: Both parts feature identical electrical ratings (1.5 A, 30 V). The primary difference is package type: 2SD2657KT146 uses SOT-23-3 (same as 2STR1230), while 2SD2657TL uses SC-96 (TSMT3). The SC-96 package provides 1 W power dissipation versus 200 mW for SOT-23-3. Select 2SD2657KT146 for direct PCB compatibility; select 2SD2657TL when higher power dissipation is required.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. The 2STR1230 is also ROHS3 compliant. Compliance certification is maintained across all active substitute options.

Q: What does MSL 1 (Unlimited) mean for component selection?

A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life without moisture exposure controls. All substitute parts listed carry MSL 1 rating, matching the 2STR1230 specification. This ensures equivalent handling and storage requirements.

Q: Can I use 2SC5866TLR as a substitute if my circuit only requires 30 V?

A: Yes. The 2SC5866TLR operates at 60 V collector-emitter breakdown voltage, which exceeds the 30 V requirement. Higher voltage rating provides additional safety margin. The 2 A collector current capability also exceeds the 1.5 A requirement. This part is suitable when higher voltage and current margins are beneficial for circuit reliability.

Q: Why does 2SD2657KT146 show lower power rating (200 mW) than 2STR1230 (500 mW)?

A: The 2SD2657KT146 uses SOT-23-3 package with thermal limitations of 200 mW. The 2STR1230 also specifies 500 mW in SOT-23-3, indicating higher thermal performance in the same package. For applications requiring full 500 mW dissipation, select 2SD2657TL (SC-96 package, 1 W rating) or 2SC5866TLR (SC-96 package, 500 mW rating).

Q: Are there any frequency or switching speed differences between substitutes?

A: Transition frequency specifications vary among substitutes. The 2STR1230 does not specify transition frequency. Substitute parts range from 150 MHz to 330 MHz. For applications sensitive to switching speed, verify that the selected substitute's transition frequency meets circuit requirements.

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

A: Both parts are electrically identical with 500 mA collector current, 32 V voltage rating, and SOT-23-3 package. The difference is packaging format: KT146Q is Cut Tape (CT) & Digi-Reel format, while KT146R is also Cut Tape (CT) & Digi-Reel format. Both are active in production and suitable for equivalent applications.

Q: Can I parallel multiple 2SC2411 devices to achieve 1.5 A capability?

A: Paralleling transistors for current addition requires careful circuit design including current-sharing resistors and thermal management. While technically possible, this approach increases component count and complexity. The 2SD2657KT146 or 2SD2657TL provide direct 1.5 A capability without paralleling complexity.

Q: Is the 2SD1781KT146R suitable for the 2STR1230 application?

A: The 2SD1781KT146R supports 800 mA collector current at 32 V, which is below the 2STR1230 rating of 1.5 A at 30 V. This part is suitable only for applications where actual circuit current does not exceed 800 mA. For full 1.5 A capability, select 2SD2657KT146 or higher-rated alternatives.

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