KSC839YBU Equivalent & Substitute Parts

Part Overview

The KSC839YBU is an NPN bipolar junction transistor manufactured by onsemi, rated for 30 V collector-emitter breakdown voltage and 100 mA maximum collector current in a TO-92-3 through-hole package. This device is classified as obsolete, necessitating identification of active substitute components for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility within the specified parameter ranges while offering active product status and current availability.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	30	V
Current - Collector (Ic) (Max)	100	mA
Vce Saturation (Max) @ Ib, Ic	400 mV @ 1 mA, 10 mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 2 mA, 12 V	—
Power - Max	250	mW
Frequency - Transition	200	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—

Substitute Part Grouping Explanation

Substitute parts for the KSC839YBU are selected based on the following critical parameters:

Electrical Compatibility Criteria:

Transistor type must be NPN
Voltage - Collector Emitter Breakdown (Max) must equal or exceed 30 V
Current - Collector (Ic) (Max) must equal or exceed 100 mA
Package / Case must be TO-92-3 (TO-226-3)
Mounting type must be Through Hole

The identified substitute parts, LP395Z/NOPB and LP395Z/LFT1, both manufactured by Texas Instruments, satisfy these electrical and mechanical compatibility requirements. Both devices feature a 36 V collector-emitter breakdown voltage rating, which exceeds the 30 V requirement of the original part. Both maintain the TO-92-3 through-hole package configuration, ensuring direct mechanical and electrical compatibility in existing circuit designs.

Parameter Comparison

Parameter	KSC839YBU (onsemi)	LP395Z/NOPB (TI)	LP395Z/LFT1 (TI)
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	30 V	36 V	36 V
Current - Collector (Ic) (Max)	100 mA	—	—
Power - Max	250 mW	—	—
Frequency - Transition	200 MHz	—	—
Operating Temperature	150°C (TJ)	0°C ~ 125°C (TA)	0°C ~ 125°C (TA)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3
Product Status	Obsolete	Active	Active
RoHS Status	—	ROHS3 Compliant	—

Engineering Selection Recommendations

LP395Z/NOPB (Texas Instruments): This substitute is supplied in bulk packaging and carries active product status. The device is ROHS3 compliant, meeting current environmental and regulatory requirements. With 36 V collector-emitter breakdown voltage, it provides 6 V margin above the KSC839YBU specification. This part is suitable for applications requiring high-volume procurement and standard bulk handling.

LP395Z/LFT1 (Texas Instruments): This substitute is supplied in cut tape packaging and carries active product status. The device maintains the same 36 V collector-emitter breakdown voltage rating as the LP395Z/NOPB variant. This packaging format is appropriate for automated assembly processes and applications requiring tape-and-reel component handling.

Both Texas Instruments LP395Z variants provide equivalent electrical performance within the specified parameter ranges and offer superior product lifecycle status compared to the obsolete KSC839YBU. Selection between LP395Z/NOPB and LP395Z/LFT1 depends on procurement and assembly methodology requirements rather than electrical performance differences.

Frequently Asked Questions (FAQ)

Q: Can LP395Z/NOPB or LP395Z/LFT1 directly replace KSC839YBU in existing designs?

A: Yes. Both substitute parts maintain identical TO-92-3 through-hole package configuration and NPN transistor type. The 36 V collector-emitter breakdown voltage rating of the LP395Z variants exceeds the 30 V requirement of the KSC839YBU, providing electrical compatibility for applications operating within the original design specifications.

Q: What is the difference between LP395Z/NOPB and LP395Z/LFT1?

A: The primary difference is packaging format. LP395Z/NOPB is supplied in bulk packaging, while LP395Z/LFT1 is supplied in cut tape packaging. Both devices are electrically identical and carry active product status from Texas Instruments. Selection depends on procurement requirements and assembly process compatibility.

Q: Are there electrical parameter differences between the KSC839YBU and LP395Z variants?

A: The LP395Z variants feature a higher collector-emitter breakdown voltage rating (36 V versus 30 V). Complete electrical parameter specifications for the LP395Z devices are not provided in the available documentation. Detailed datasheets should be consulted for applications requiring specific performance characteristics such as DC current gain, saturation voltage, or transition frequency.

Q: Is the operating temperature range compatible?

A: The KSC839YBU specifies a maximum junction temperature (TJ) of 150°C, while the LP395Z variants specify an ambient temperature range of 0°C to 125°C (TA). Applications operating near the upper temperature limits of the original design should be evaluated against the LP395Z ambient temperature specification.

Q: Are the substitute parts RoHS compliant?

A: LP395Z/NOPB is ROHS3 compliant. RoHS compliance status for LP395Z/LFT1 is not specified in the available documentation. Applications subject to RoHS requirements should verify compliance documentation with the component supplier.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message