KSH41CITU Equivalent & Substitute Parts

Part Overview

The KSH41CITU is an NPN bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 6 A maximum collector current. This device is packaged in a Through Hole I-PAK (TO-251-3 Short Leads) configuration and is designed for applications requiring moderate power dissipation up to 1.75 W. The KSH41CITU is classified as obsolete, making identification of functionally equivalent substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	100	V
Current - Collector (Ic) (Max)	6	A
Power - Max	1.75	W
Vce Saturation (Max) @ Ib, Ic	1.5V @ 600mA, 6A	—
DC Current Gain (hFE) (Min) @ Ic, Vce	15 @ 3A, 4V	—
Frequency - Transition	3	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-251-3 Short Leads, IPak, TO-251AA	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the KSH41CITU is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Transistor type must be NPN
Voltage - Collector Emitter Breakdown (Max) must be ≥ 100 V
Current - Collector (Ic) (Max) must be ≥ 6 A
Power - Max must be ≥ 1.75 W
Operating Temperature (TJ) must be ≥ 150°C
Mounting type must be Through Hole
Package / Case must be TO-251-3 Short Leads, IPak, or TO-251AA

Mechanical Compatibility Criteria:

Package configuration must support direct physical replacement in existing PCB layouts

The substitute parts listed below are evaluated against these criteria. Parts that do not meet all electrical requirements are identified with their specific limitations.

Parameter Comparison

Parameter	KSH41CITU	2SC4134T-E	2SD1816S-H
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	100 V	100 V	100 V
Current - Collector (Ic) (Max)	6 A	1 A	4 A
Power - Max	1.75 W	800 mW	1 W
Vce Saturation (Max) @ Ib, Ic	1.5V @ 600mA, 6A	400mV @ 40mA, 400mA	400mV @ 200mA, 2A
DC Current Gain (hFE) (Min) @ Ic, Vce	15 @ 3A, 4V	200 @ 100mA, 5V	140 @ 500mA, 5V
Frequency - Transition	3 MHz	120 MHz	180 MHz
Operating Temperature (TJ)	150°C	150°C	150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-251-3 Short Leads, IPak, TO-251AA	TO-251-3 Short Leads, IPak, TO-251AA	TO-251-3 Short Leads, IPak, TO-251AA
Product Status	Obsolete	Active	Obsolete

Engineering Selection Recommendations

2SC4134T-E: This part does not meet the electrical requirements for direct substitution. The maximum collector current rating of 1 A is insufficient for applications requiring the 6 A capability of the KSH41CITU. The maximum power dissipation of 800 mW is also below the 1.75 W requirement. This part is suitable only for applications with reduced current demands. The 2SC4134T-E holds Active product status and is RoHS3 compliant, providing long-term availability.

2SD1816S-H: This part does not meet the electrical requirements for direct substitution. The maximum collector current rating of 4 A falls short of the 6 A requirement of the KSH41CITU. The maximum power dissipation of 1 W is below the 1.75 W specification. This part is suitable for applications with current demands up to 4 A. The 2SD1816S-H is classified as Obsolete, similar to the KSH41CITU. RoHS3 compliance is confirmed.

Substitution Feasibility: Neither substitute part meets all electrical parameters required for direct replacement of the KSH41CITU in applications demanding the full 6 A collector current and 1.75 W power dissipation. Both parts share identical package configuration and operating temperature range, ensuring mechanical compatibility. Selection of either substitute requires circuit redesign or application reassessment to accommodate reduced current and power ratings.

Frequently Asked Questions (FAQ)

Q: Can the 2SC4134T-E directly replace the KSH41CITU? A: No. The 2SC4134T-E has a maximum collector current of 1 A and maximum power dissipation of 800 mW, both insufficient for the KSH41CITU specification of 6 A and 1.75 W. Direct substitution is not possible without circuit modification.

Q: Can the 2SD1816S-H directly replace the KSH41CITU? A: No. The 2SD1816S-H has a maximum collector current of 4 A and maximum power dissipation of 1 W, both below the KSH41CITU requirements of 6 A and 1.75 W. Direct substitution is not possible without circuit modification.

Q: Are the substitute parts mechanically compatible with the KSH41CITU? A: Yes. Both substitute parts use the same TO-251-3 Short Leads (I-PAK) package configuration, enabling physical replacement in existing PCB layouts. However, electrical compatibility must be verified for the specific application.

Q: What is the primary difference between the KSH41CITU and the substitute parts? A: The KSH41CITU is rated for 6 A collector current and 1.75 W power dissipation. The 2SC4134T-E is limited to 1 A and 800 mW, while the 2SD1816S-H is limited to 4 A and 1 W. Both substitutes have higher transition frequencies (120 MHz and 180 MHz respectively) compared to the KSH41CITU (3 MHz).

Q: What is the product status of each part? A: The KSH41CITU and 2SD1816S-H are both classified as Obsolete. The 2SC4134T-E is Active, providing superior long-term availability and procurement reliability.

Q: Are compliance certifications equivalent across all parts? A: The KSH41CITU is REACH Unaffected. The 2SC4134T-E is RoHS3 Compliant and REACH Unaffected. The 2SD1816S-H is RoHS3 Compliant and REACH Unaffected. Compliance requirements for the target application must be verified before selection.

Q: What is the significance of the DC Current Gain (hFE) differences? A: The substitute parts exhibit higher DC current gain values at lower collector currents compared to the KSH41CITU. The 2SC4134T-E shows hFE of 200 @ 100mA, and the 2SD1816S-H shows hFE of 140 @ 500mA, versus the KSH41CITU at hFE of 15 @ 3A. These differences reflect the lower current ratings of the substitute parts and affect base drive requirements in circuit design.

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