KSE13003AS Equivalent & Substitute Parts

Part Overview

The KSE13003AS is an NPN bipolar junction transistor manufactured by onsemi, rated for 400 V collector-emitter breakdown voltage and 1.5 A maximum collector current in a TO-126-3 through-hole package. This device is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement continuity. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	400	V
Current - Collector (Ic) (Max)	1.5	A
Power - Max	20	W
Frequency - Transition	4	MHz
Operating Temperature (Max)	150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-126-3	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Electrical Compatibility Requirements:

Transistor type must be NPN
Voltage - Collector Emitter Breakdown (Max) must be ≥ 400 V
Current - Collector (Ic) (Max) must be ≥ 1.5 A
Power - Max must be ≥ 20 W
Operating Temperature (Max) must be ≥ 150°C

Mechanical Compatibility Requirements:

Mounting type must be Through Hole
Package / Case must be compatible with TO-126-3 footprint

Substitute parts are classified into two categories:

Direct Equivalent: Parts meeting all electrical parameters within the specified ranges and maintaining identical or superior performance characteristics.

Similar Equivalent: Parts meeting core electrical parameters with variations in secondary characteristics (such as power rating, saturation voltage, or package designation) that do not compromise functional compatibility in typical applications.

Parameter Comparison

Parameter	KSE13003AS (Main)	FJE3303H1TU (Direct)	ST13003-K (Similar)
Manufacturer	onsemi	onsemi	STMicroelectronics
Product Status	Obsolete	Active	Active
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	400 V	400 V	400 V
Current - Collector (Ic) (Max)	1.5 A	1.5 A	1.5 A
Vce Saturation (Max) @ Ib, Ic	3V @ 500mA, 1.5A	3V @ 500mA, 1.5A	1.5V @ 500mA, 1.5A
DC Current Gain (hFE) (Min) @ Ic, Vce	8 @ 500mA, 2V	8 @ 500mA, 2V	5 @ 1A, 2V
Power - Max	20 W	20 W	40 W
Frequency - Transition	4 MHz	4 MHz	Not specified
Operating Temperature (Max)	150°C (TJ)	150°C (TJ)	150°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-126-3	TO-126-3	SOT-32-3
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

FJE3303H1TU (Direct Equivalent - Recommended Primary Choice)

The FJE3303H1TU is manufactured by onsemi and maintains identical electrical specifications to the KSE13003AS across all critical parameters: 400 V breakdown voltage, 1.5 A collector current, 20 W power rating, 4 MHz transition frequency, and 150°C maximum operating temperature. This part is currently in active production status with 1483 units in stock. The FJE3303H1TU is ROHS3 compliant and carries identical REACH and ECCN classifications. The TO-126-3 package provides direct mechanical compatibility. This part is the optimal substitute for direct replacement applications.

ST13003-K (Similar Equivalent - Alternative Selection)

The ST13003-K is manufactured by STMicroelectronics and meets the core electrical requirements with enhanced performance characteristics. It maintains 400 V breakdown voltage and 1.5 A collector current ratings. The ST13003-K provides superior power dissipation capability at 40 W (versus 20 W), lower saturation voltage at 1.5 V (versus 3 V), and extended operating temperature range from -40°C to 150°C. This part is in active production with 105300 units in stock and is ROHS3 compliant. The package designation is SOT-32-3, which is mechanically compatible with TO-126-3 footprints in through-hole applications. The ST13003-K is suitable for applications requiring enhanced thermal performance or lower saturation losses.

Frequently Asked Questions (FAQ)

Q: Can FJE3303H1TU be used as a direct replacement for KSE13003AS?

A: Yes. The FJE3303H1TU maintains identical electrical specifications across all critical parameters including voltage rating, current rating, power dissipation, and frequency response. Both parts use the TO-126-3 package. The FJE3303H1TU is the direct equivalent.

Q: What are the differences between FJE3303H1TU and ST13003-K?

A: Both parts meet the core electrical requirements of 400 V, 1.5 A, and 150°C operation. The ST13003-K offers higher power rating (40 W versus 20 W), lower saturation voltage (1.5 V versus 3 V), and wider operating temperature range (-40°C to 150°C). The ST13003-K uses SOT-32-3 package designation versus TO-126-3, though both are mechanically compatible through-hole packages.

Q: Are there package compatibility concerns with ST13003-K?

A: The ST13003-K uses SOT-32-3 package designation while the KSE13003AS uses TO-126-3. Both are through-hole packages with compatible mechanical footprints. Verify PCB layout compatibility with the specific package outline before selection.

Q: What is the inventory status of these substitutes?

A: FJE3303H1TU has 1483 units in stock. ST13003-K has 105300 units in stock. Both parts are in active production.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both FJE3303H1TU and ST13003-K are ROHS3 compliant. The original KSE13003AS RoHS status is not specified.

Q: Which substitute should be selected for thermal-constrained applications?

A: The ST13003-K is suitable for applications requiring enhanced thermal performance due to its 40 W power rating and lower saturation voltage characteristics.

Q: Can both substitutes be used interchangeably in the same design?

A: Both parts meet the minimum electrical requirements for KSE13003AS replacement. However, differences in saturation voltage and power rating may affect circuit performance. Verify application-specific requirements before selecting between them.

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