KSE350STU Equivalent & Substitute Parts

Part Overview

The KSE350STU is a PNP bipolar junction transistor manufactured by onsemi, rated for 300 V collector-emitter breakdown voltage and 500 mA maximum collector current in a TO-126-3 through-hole package. This device is classified as obsolete, indicating discontinuation from the manufacturer. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability for production, and support long-term product maintenance and repair operations.

Key Parameters

Parameter	Value
Transistor Type	PNP
Voltage - Collector Emitter Breakdown (Max)	300 V
Current - Collector (Ic) (Max)	500 mA
Power - Max	20 W
DC Current Gain (hFE) (Min) @ Ic, Vce	30 @ 50mA, 10V
Current - Collector Cutoff (Max)	100µA (ICBO)
Mounting Type	Through Hole
Package / Case	TO-225AA, TO-126-3
Operating Temperature (Max)	150°C (TJ)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the KSE350STU is determined by electrical and mechanical parameter equivalence across the following criteria:

Electrical Parameters (Critical for Functional Compatibility):

Transistor polarity: PNP type required
Voltage rating: 300 V collector-emitter breakdown voltage
Current rating: 500 mA maximum collector current
Power dissipation: 20 W or greater
DC current gain: 30 (minimum) @ 50mA, 10V
Collector cutoff current: 100µA (ICBO)

Mechanical Parameters (Required for Physical Compatibility):

Mounting type: Through hole configuration
Package compatibility: TO-126-3 or equivalent TO-225AA footprint

Compliance Parameters:

RoHS3 compliance status
REACH unaffected classification

The substitute parts MJE350G (onsemi) and MJE350 (STMicroelectronics) meet all electrical specifications and mounting requirements. Both devices are active products with current manufacturing status, ensuring long-term availability and supply chain stability.

Parameter Comparison

Parameter	KSE350STU (onsemi)	MJE350G (onsemi)	MJE350 (STMicroelectronics)
Transistor Type	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	300 V	300 V	300 V
Current - Collector (Ic) (Max)	500 mA	500 mA	500 mA
Power - Max	20 W	20 W	20.8 W
DC Current Gain (hFE) (Min) @ Ic, Vce	30 @ 50mA, 10V	30 @ 50mA, 10V	30 @ 50mA, 10V
Current - Collector Cutoff (Max)	100µA (ICBO)	100µA (ICBO)	100µA (ICBO)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-225AA, TO-126-3	TO-225AA, TO-126-3	TO-225AA, TO-126-3
Operating Temperature (Max)	150°C (TJ)	150°C (TJ)	150°C (TJ)
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

MJE350G (onsemi) is the primary substitute for KSE350STU applications. This device maintains identical electrical specifications and is manufactured by the same original equipment manufacturer. MJE350G is classified as an active product with current production status, ensuring consistent availability and supply chain reliability. The device is supplied in bulk packaging and meets all RoHS3 and REACH compliance requirements. Operating temperature range extends to -65°C, providing enhanced low-temperature performance compared to the original part.

MJE350 (STMicroelectronics) serves as an alternative substitute when MJE350G availability is constrained. This device meets all critical electrical parameters and exceeds power dissipation specifications at 20.8 W. The STMicroelectronics variant is supplied in tube packaging and maintains active product status. Physical compatibility is confirmed through TO-126-3 package equivalence. Both RoHS3 and REACH compliance certifications are satisfied.

Selection between MJE350G and MJE350 depends on supply availability, packaging requirements, and manufacturer preference within design specifications. Both devices are electrically and mechanically interchangeable with the obsolete KSE350STU.

Frequently Asked Questions (FAQ)

Q: Can MJE350G directly replace KSE350STU in existing circuit designs?

A: Yes. MJE350G meets all electrical specifications including voltage rating (300 V), current rating (500 mA), power dissipation (20 W), and DC current gain (30 @ 50mA, 10V). Physical compatibility is confirmed through identical TO-126-3 package designation. No circuit modifications are required.

Q: What is the difference between MJE350G and MJE350?

A: Both devices meet identical electrical specifications for the KSE350STU application. The primary differences are manufacturer (onsemi versus STMicroelectronics), packaging format (bulk versus tube), and power rating (20 W versus 20.8 W). The STMicroelectronics variant provides slightly higher power dissipation capability.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All three devices share TO-126-3 package designation and TO-225AA footprint compatibility. Through-hole mounting configuration is identical across all variants. PCB layout and mechanical assembly procedures remain unchanged.

Q: Do the substitute parts meet current compliance requirements?

A: Yes. Both MJE350G and MJE350 are RoHS3 compliant and REACH unaffected, matching the compliance status of the original KSE350STU. These certifications satisfy current regulatory requirements for electronic component manufacturing and distribution.

Q: Why is KSE350STU classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Substitute parts MJE350G and MJE350 are active products with current manufacturing status, ensuring long-term availability for new designs and replacement applications.

Q: What is the operating temperature range for substitute parts?

A: MJE350G operates from -65°C to 150°C junction temperature, exceeding the original KSE350STU specification of 150°C maximum. MJE350 (STMicroelectronics) operates to 150°C maximum junction temperature, matching the original specification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message