KSC2881OTF Equivalent & Substitute Parts

Part Overview

The KSC2881OTF is an NPN bipolar junction transistor manufactured by onsemi, rated for 120V collector-emitter breakdown voltage and 800mA maximum collector current in a surface mount SOT-89-3 package. This device is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. The part delivers 1W maximum power dissipation with a transition frequency of 120MHz, suitable for general-purpose switching and amplification applications requiring moderate voltage and current ratings.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	120	V
Current - Collector (Ic) (Max)	800	mA
Power - Max	1	W
Frequency - Transition	120	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	80 @ 100mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	1V @ 50mA, 500mA	—
Current - Collector Cutoff (Max)	100	nA
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-243AA	—

Substitute Part Grouping Explanation

Substitution of the KSC2881OTF is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor type must be NPN
Collector-emitter breakdown voltage must be ≥120V
Maximum collector current must be ≥800mA
Power dissipation must be ≥1W
Transition frequency must support the application bandwidth
DC current gain (hFE) must meet or exceed minimum specifications
Saturation voltage characteristics must be compatible with circuit requirements

Mechanical Compatibility Criteria:

Surface mount mounting type required
Package footprint must be compatible with TO-243AA or equivalent land pattern
Moisture sensitivity level must be acceptable for assembly processes

Substitute parts are classified into two categories: Direct Parametric Equivalents (matching all key electrical specifications) and Functional Substitutes (meeting minimum electrical requirements with acceptable trade-offs in secondary parameters).

Parameter Comparison

Parameter	KSC2881OTF (Main)	2SCR372P5T100Q	2SCR372P5T100R	BSR43,115	2SC2881-O-TP
Manufacturer	onsemi	Rohm Semiconductor	Rohm Semiconductor	Nexperia USA Inc.	Micro Commercial Co
Transistor Type	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	120V	120V	120V	80V	120V
Current - Collector (Ic) (Max)	800mA	700mA	700mA	1A	800mA
Power - Max	1W	500mW	500mW	1.35W	1W
Frequency - Transition	120MHz	220MHz	220MHz	100MHz	120MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	80 @ 100mA, 5V	120 @ 100mA, 5V	120 @ 100mA, 5V	100 @ 100mA, 5V	80 @ 100mA, 5V
Vce Saturation (Max) @ Ib, Ic	1V @ 50mA, 500mA	300mV @ 50mA, 500mA	300mV @ 50mA, 500mA	500mV @ 50mA, 500mA	1V @ 50mA, 500mA
Current - Collector Cutoff (Max)	100nA	1µA	1µA	100nA	100nA
Operating Temperature (TJ)	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
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Parametric Equivalent:

The 2SC2881-O-TP manufactured by Micro Commercial Co is the direct parametric equivalent to the KSC2881OTF. This part matches all critical electrical specifications including 120V breakdown voltage, 800mA maximum collector current, 1W power rating, and 120MHz transition frequency. The DC current gain and saturation voltage characteristics are identical. The 2SC2881-O-TP is currently in active production status with RoHS3 compliance, providing a seamless replacement path for obsolete KSC2881OTF inventory. This part is recommended as the primary substitute for direct board-level replacement.

Functional Substitutes with Trade-offs:

The 2SCR372P5T100Q and 2SCR372P5T100R from Rohm Semiconductor are functionally compatible substitutes. Both parts maintain the 120V breakdown voltage requirement and provide superior transition frequency performance at 220MHz. However, these parts are rated for 700mA maximum collector current (100mA below the main part specification) and 500mW power dissipation (50% of the main part rating). These devices are suitable for applications where collector current does not exceed 700mA and power dissipation remains below 500mW. Both Rohm parts are in active production with RoHS3 compliance and identical operating temperature ratings.

The BSR43,115 from Nexperia USA Inc. is a functional substitute with different electrical characteristics. This part provides higher current capability at 1A and superior power dissipation at 1.35W, but operates at a reduced breakdown voltage of 80V. The BSR43,115 is suitable only for applications where the 80V breakdown voltage is acceptable and collector current requirements exceed 800mA. This part is in active production with RoHS3 compliance.

All substitute parts maintain surface mount mounting type and TO-243AA package compatibility with the original KSC2881OTF.

Frequently Asked Questions (FAQ)

Q: Can the 2SC2881-O-TP directly replace the KSC2881OTF without circuit modifications?

A: Yes. The 2SC2881-O-TP is a direct parametric equivalent with identical electrical specifications across all critical parameters including breakdown voltage, collector current rating, power dissipation, transition frequency, and saturation voltage characteristics. No circuit modifications are required for direct substitution.

Q: What are the limitations of using 2SCR372P5T100Q or 2SCR372P5T100R as substitutes?

A: The Rohm Semiconductor parts (2SCR372P5T100Q and 2SCR372P5T100R) have reduced maximum collector current (700mA versus 800mA) and power dissipation (500mW versus 1W). These parts are suitable only for applications where actual operating collector current does not exceed 700mA and power dissipation remains below 500mW. The higher transition frequency (220MHz) may provide performance benefits in high-frequency applications. Verify circuit operating conditions before substitution.

Q: Is the BSR43,115 suitable as a replacement for the KSC2881OTF?

A: The BSR43,115 is a functional substitute only for applications where the reduced breakdown voltage of 80V is acceptable. This part is not suitable for circuits requiring the full 120V breakdown voltage rating of the KSC2881OTF. The BSR43,115 offers higher current capability (1A) and power dissipation (1.35W), making it suitable for higher-power applications within the 80V voltage constraint.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 2SC2881-O-TP, 2SCR372P5T100Q, 2SCR372P5T100R, and BSR43,115 are all RoHS3 compliant. The original KSC2881OTF RoHS status was not specified in the provided data.

Q: Do all substitute parts use the same package footprint?

A: Yes. All substitute parts use the TO-243AA package / case designation with surface mount mounting type, ensuring mechanical compatibility with existing PCB layouts designed for the KSC2881OTF.

Q: What is the inventory status of substitute parts?

A: The 2SCR372P5T100Q has 10,300 units in stock, 2SCR372P5T100R has 3,400 units in stock, 2SC2881-O-TP has 821 units in stock, and BSR43,115 has 1,880 units in stock. All parts are available as new original components.

Q: Which substitute part should be selected for new designs?

A: For new designs requiring the full electrical specification of the KSC2881OTF, the 2SC2881-O-TP is the recommended choice due to identical parametric matching and active production status. For applications with reduced current or power requirements, the 2SCR372P5T100Q or 2SCR372P5T100R offer enhanced transition frequency performance. Selection should be based on specific circuit operating conditions and voltage/current requirements.

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