2SB1140-R-TP Equivalent & Substitute Parts

Part Overview

The 2SB1140-R-TP is a Surface Mount PNP Bipolar Junction Transistor manufactured by Micro Commercial Co, rated for 50V collector-emitter breakdown voltage and 2A maximum collector current. This component is classified as Obsolete, indicating discontinuation from active production. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor topology.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	2	A
Voltage - Collector Emitter Breakdown (Max)	50	V
Power - Max	500	mW
Frequency - Transition	80	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-243AA	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the 2SB1140-R-TP is determined by the following critical parameters:

Mandatory Matching Criteria:

Transistor Type: PNP
Current - Collector (Ic) (Max): 2 A
Voltage - Collector Emitter Breakdown (Max): 50 V
Mounting Type: Surface Mount
Package / Case: TO-243AA
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Power - Max: Substitute parts may exceed 500 mW (higher power rating is acceptable)
Frequency - Transition: Substitute parts may exceed 80 MHz (higher frequency capability is acceptable)
DC Current Gain (hFE): Variations permitted within device specifications
Vce Saturation: Variations permitted within device specifications
Current - Collector Cutoff (ICBO): Variations permitted within device specifications

All four substitute parts meet the mandatory matching criteria and are therefore electrically and mechanically compatible with the 2SB1140-R-TP in TO-243AA surface mount applications.

Parameter Comparison

Parameter	2SB1140-R-TP	2SA1797T100P	2SAR553PT100	2SB1123S-TD-E	2SB1123T-TD-E
Manufacturer	Micro Commercial Co	Rohm Semiconductor	Rohm Semiconductor	onsemi	onsemi
Transistor Type	PNP	PNP	PNP	PNP	PNP
Current - Collector (Ic) (Max)	2 A	2 A	2 A	2 A	2 A
Voltage - Collector Emitter Breakdown (Max)	50 V	50 V	50 V	50 V	50 V
Power - Max	500 mW	2 W	2 W	500 mW	500 mW
Frequency - Transition	80 MHz	200 MHz	320 MHz	150 MHz	150 MHz
Operating Temperature (Max)	150°C	150°C	150°C	150°C	150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Not For New Designs	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation: 2SAR553PT100

The 2SAR553PT100 manufactured by Rohm Semiconductor is the preferred substitute for the 2SB1140-R-TP. This part maintains full electrical and mechanical compatibility while offering Active product status, ensuring long-term availability and supply chain stability. The 2SAR553PT100 provides enhanced performance characteristics including 320 MHz transition frequency and 2W power dissipation, both exceeding the original specification. ROHS3 compliance and REACH Unaffected status confirm regulatory alignment.

Secondary Recommendations: 2SB1123T-TD-E and 2SB1123S-TD-E

Both onsemi variants (2SB1123T-TD-E and 2SB1123S-TD-E) are Active products offering direct electrical and mechanical substitution. These parts maintain the 500 mW power rating and 150 MHz transition frequency, closely matching the original 2SB1140-R-TP performance envelope. The 2SB1123T-TD-E is available in Cut Tape & Digi-Reel packaging with higher inventory levels (25,400 pcs), while the 2SB1123S-TD-E is supplied in Tape & Reel format. Both are ROHS3 compliant and REACH Unaffected.

Alternative Option: 2SA1797T100P

The 2SA1797T100P from Rohm Semiconductor provides electrical compatibility with enhanced power handling (2W) and frequency response (200 MHz). However, this part carries Not For New Designs status, limiting its suitability for new applications. Existing designs currently utilizing this part may continue procurement, but migration to Active alternatives is recommended for long-term sustainability.

Frequently Asked Questions (FAQ)

Q: Can the 2SAR553PT100 directly replace the 2SB1140-R-TP without circuit modification?

A: Yes. The 2SAR553PT100 maintains identical electrical ratings for collector current (2A), collector-emitter breakdown voltage (50V), and surface mount TO-243AA packaging. The enhanced power dissipation (2W vs. 500mW) and transition frequency (320MHz vs. 80MHz) provide superior performance margins without requiring design changes.

Q: What is the difference between the 2SB1123T-TD-E and 2SB1123S-TD-E?

A: Both parts are electrically identical PNP transistors with 2A collector current and 50V breakdown voltage. The primary difference is packaging format: 2SB1123T-TD-E is supplied in Cut Tape & Digi-Reel format, while 2SB1123S-TD-E is supplied in Tape & Reel format. Selection depends on assembly line requirements and inventory management preferences.

Q: Why is the 2SA1797T100P marked as "Not For New Designs"?

A: The Not For New Designs status indicates the manufacturer has discontinued active development and support for this part. While existing inventory remains available for current production, this classification signals potential future discontinuation. New designs should prioritize Active status parts such as 2SAR553PT100 or the 2SB1123 series to ensure long-term supply chain continuity.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All four substitute parts (2SA1797T100P, 2SAR553PT100, 2SB1123S-TD-E, and 2SB1123T-TD-E) are ROHS3 compliant, matching the original 2SB1140-R-TP environmental certification status.

Q: What is the significance of the TO-243AA package specification?

A: The TO-243AA package is a three-terminal surface mount configuration (SOT-89 equivalent) with standardized pin spacing and footprint. All substitute parts utilize this identical package, ensuring mechanical compatibility with existing printed circuit board layouts without requiring PCB redesign.

Q: Can substitute parts with higher power ratings (2W) be used in applications designed for 500mW?

A: Yes. Higher power ratings provide additional thermal margin and design flexibility. A 2W-rated device operates safely within a 500mW application envelope. The enhanced power dissipation capability does not introduce compatibility issues and may improve thermal performance in the application.

Q: What inventory levels are available for each substitute part?

A: Current inventory levels are: 2SAR553PT100 (23,995 pcs), 2SB1123T-TD-E (25,400 pcs), 2SA1797T100P (51,100 pcs), and 2SB1123S-TD-E (13,200 pcs). These quantities support both immediate procurement and long-term production planning requirements.

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