KSE180S Equivalent & Substitute Parts

Part Overview

The KSE180S is an NPN bipolar junction transistor manufactured by onsemi, rated for 40V collector-emitter breakdown voltage and 3A maximum collector current. This component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. The KSE180S operates at 50MHz transition frequency with 1.5W maximum power dissipation in a Through Hole TO-126-3 package configuration.

Substiute Parts

KSE180S

onsemiIn Stock: 2098KSE180S Datasheet

Current PartRFQ

MJE180STU

Fairchild SemiconductorIn Stock: 6784MJE180STU Datasheet

DirectRFQ

MJE180G

onsemiIn Stock: 1527MJE180G Datasheet

Parametric EquivalentRFQ

MJE180 PBFREE

Central Semiconductor CorpIn Stock: 2120MJE180 PBFREE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KSE180S is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

• Transistor Type: NPN configuration
• Current - Collector (Ic) (Max): 3 A
• Voltage - Collector Emitter Breakdown (Max): 40 V
• 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: 50MHz
• Mounting Type: Through Hole
• Package / Case: TO-126-3

All identified substitute parts meet these electrical specifications and physical package requirements. Substitutes are classified as either Direct Manufacturer equivalents or Parametric Equivalents based on specification alignment and product status.

Parameter Comparison

Engineering Selection Recommendations

MJE180STU (Fairchild Semiconductor) - Direct Manufacturer Equivalent

The MJE180STU is classified as a Direct Manufacturer equivalent. This part maintains active product status and provides full electrical and mechanical compatibility with the KSE180S. The MJE180STU is suitable for applications requiring immediate component availability and ongoing production support.

MJE180G (onsemi) - Parametric Equivalent

The MJE180G is classified as a Parametric Equivalent manufactured by onsemi, the original manufacturer of the KSE180S. This part holds active product status and is ROHS3 compliant. The MJE180G provides continuity within the onsemi product family and is appropriate for designs requiring compliance certification and long-term supply assurance.

MJE180 PBFREE (Central Semiconductor Corp) - Parametric Equivalent

The MJE180 PBFREE is classified as a Parametric Equivalent with obsolete product status. While electrically and mechanically equivalent, this part shares obsolete classification with the KSE180S. Selection of this substitute is appropriate only when existing inventory must be utilized or when design constraints require Central Semiconductor sourcing.

For new designs and production continuity, MJE180G or MJE180STU are the recommended selections based on active product status and compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can the MJE180STU directly replace the KSE180S in existing circuit designs?

A: Yes. The MJE180STU meets all electrical parameters including collector current (3A), collector-emitter breakdown voltage (40V), saturation voltage (1.7V @ 600mA, 3A), DC current gain (50 @ 100mA, 1V), power rating (1.5W), and transition frequency (50MHz). Physical package configuration is identical (TO-126-3 Through Hole). No circuit modifications are required.

Q: What is the difference between a Direct Manufacturer equivalent and a Parametric Equivalent?

A: A Direct Manufacturer equivalent is sourced from a different manufacturer but maintains identical electrical and mechanical specifications. A Parametric Equivalent is sourced from the original manufacturer or alternative manufacturers and meets all specified electrical and mechanical parameters. Both categories provide full functional compatibility.

Q: Why is the KSE180S classified as obsolete?

A: The KSE180S has reached end-of-life status with the manufacturer. Active equivalent alternatives are available to support ongoing production and new design requirements.

Q: Are there compliance differences between the substitute parts?

A: The MJE180G is ROHS3 compliant. The MJE180STU and MJE180 PBFREE compliance status is not specified in available documentation. All parts maintain REACH Unaffected status. Compliance requirements should be verified against specific application and regional regulations.

Q: Can the MJE180G and MJE180STU be used interchangeably?

A: Yes. Both parts meet identical electrical specifications and physical package requirements. Selection between these parts is determined by supplier availability, compliance certifications, and procurement preferences.

Q: What is the significance of the TO-126-3 package designation?

A: The TO-126-3 package is a Through Hole configuration with three leads. All substitute parts utilize this identical package, ensuring mechanical compatibility with existing printed circuit board layouts and assembly processes.

Q: Are there any current cutoff differences between the KSE180S and substitute parts?

A: The KSE180S specifies 100nA (ICBO) maximum collector cutoff current. The MJE180STU specifies 100µA (ICBO), which is higher. This difference may affect leakage characteristics in specific applications. The MJE180G and MJE180 PBFREE specify 100nA (ICBO), matching the original part.