KSE182STU Equivalent & Substitute Parts

Part Overview

The KSE182STU is an NPN bipolar junction transistor manufactured by onsemi, rated for 80V collector-emitter breakdown voltage and 3A maximum collector current. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and procurement needs. The through-hole TO-126-3 package configuration requires substitutes with compatible mechanical and electrical specifications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	80	V
Current - Collector (Ic) (Max)	3	A
Vce Saturation (Max) @ Ib, Ic	1.7V @ 600mA, 3A	—
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 100mA, 1V	—
Power - Max	1.5	W
Frequency - Transition	50	MHz
Mounting Type	Through Hole	—
Package / Case	TO-126-3	—
Operating Temperature (Max)	150	°C

Substitute Part Grouping Explanation

Substitution of the KSE182STU is determined by electrical and mechanical parameter compatibility within the NPN transistor category. The primary substitution criteria are:

Direct Electrical Equivalence Requirements:

Transistor type: NPN
Voltage - Collector Emitter Breakdown (Max): 80V minimum
Current - Collector (Ic) (Max): 3A minimum
Vce Saturation characteristics compatible with application requirements
DC Current Gain (hFE) sufficient for circuit biasing
Power dissipation rating: 1.5W minimum
Frequency - Transition: 50MHz minimum

Mechanical Compatibility Requirements:

Mounting type: Through Hole
Package / Case: TO-126-3 or equivalent TO-225AA footprint

Compliance and Status:

Product status: Active preferred for long-term availability
REACH and ECCN compliance maintained

The MJE182G qualifies as a direct substitute, meeting all electrical parameters and maintaining identical voltage and current ratings. The 2N4923G is classified as a similar part with reduced current rating (1A vs. 3A) and different power dissipation characteristics, suitable only for applications with lower current requirements.

Parameter Comparison

Parameter	KSE182STU	MJE182G	2N4923G
Manufacturer	onsemi	onsemi	onsemi
Product Status	Obsolete	Active	Active
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	80V	80V	80V
Current - Collector (Ic) (Max)	3A	3A	1A
Vce Saturation (Max) @ Ib, Ic	1.7V @ 600mA, 3A	1.7V @ 600mA, 3A	600mV @ 100mA, 1A
Current - Collector Cutoff (Max)	100nA	100nA	500µA
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 100mA, 1V	50 @ 100mA, 1V	30 @ 500mA, 1V
Power - Max	1.5W	1.5W	30W
Frequency - Transition	50MHz	50MHz	3MHz
Operating Temperature (Max)	150°C	150°C	150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-126-3	TO-126	TO-126
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MJE182G - Direct Substitute:

The MJE182G is the primary equivalent for KSE182STU replacement. This part maintains identical electrical specifications across all critical parameters: 80V breakdown voltage, 3A collector current, 1.7V saturation voltage at rated current, 50MHz transition frequency, and 1.5W power dissipation. The MJE182G holds active product status with ROHS3 compliance and REACH unaffected designation, ensuring long-term availability and regulatory compliance. The TO-126 package is mechanically compatible with TO-126-3 footprints. Inventory availability of 65,400 units supports production requirements.

2N4923G - Similar Part with Limitations:

The 2N4923G shares the 80V voltage rating and through-hole TO-126 package but differs significantly in current handling capacity (1A vs. 3A) and transition frequency (3MHz vs. 50MHz). This part is suitable only for applications where collector current does not exceed 1A and frequency response requirements are below 3MHz. The 30W power rating exceeds the original specification but does not compensate for reduced current capability. Selection of this part requires circuit redesign validation.

Frequently Asked Questions (FAQ)

Q: Can MJE182G directly replace KSE182STU without circuit modification?

A: Yes. The MJE182G maintains identical electrical specifications for voltage rating, current capacity, saturation voltage, current gain, power dissipation, and transition frequency. The TO-126 package is mechanically compatible with TO-126-3 footprints. No circuit modification is required.

Q: What are the limitations of using 2N4923G as a substitute?

A: The 2N4923G has a maximum collector current of 1A compared to the 3A rating of KSE182STU. Additionally, the transition frequency is 3MHz versus 50MHz. These differences restrict its use to low-current, low-frequency applications. Applications requiring 3A operation or 50MHz frequency response cannot use this part.

Q: Are there package compatibility concerns between TO-126 and TO-126-3?

A: Both packages are through-hole configurations with compatible pin spacing and footprints. TO-126 and TO-126-3 designations refer to the same physical package form factor, ensuring direct mechanical compatibility on PCB layouts.

Q: What compliance certifications apply to substitute parts?

A: MJE182G and 2N4923G both carry ROHS3 compliance and REACH unaffected status. Both parts have EAR99 ECCN classification. These certifications match or exceed the regulatory requirements of the obsolete KSE182STU.

Q: How does product status affect part selection?

A: MJE182G and 2N4923G hold active product status, ensuring continued manufacturing and availability. The KSE182STU is obsolete, making substitution necessary for new designs and ongoing procurement. Active status provides supply chain stability and long-term support.

Q: Are there differences in DC current gain between the parts?

A: The KSE182STU and MJE182G both specify minimum hFE of 50 @ 100mA, 1V. The 2N4923G specifies minimum hFE of 30 @ 500mA, 1V. For applications requiring consistent gain characteristics at 100mA operation, MJE182G is the appropriate choice.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message