KSA940H2 Equivalent & Substitute Parts

Part Overview

The KSA940H2 is a PNP bipolar junction transistor manufactured by onsemi, rated for 150 V collector-emitter breakdown voltage and 1.5 A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements where the original part is no longer readily procurable.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	150	V
Current - Collector (Ic) (Max)	1.5	A
Power - Max	1.5	W
Frequency - Transition	4	MHz
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
Operating Temperature (Max)	150	°C

Substitute Part Grouping Explanation

Substitute parts for the KSA940H2 are classified into two categories based on electrical parameter alignment:

Direct Equivalent (KSA940TU): This substitute maintains identical electrical specifications across all critical parameters: 150 V breakdown voltage, 1.5 A maximum collector current, 1.5 W power dissipation, 4 MHz transition frequency, and TO-220-3 package configuration. The KSA940TU differs only in packaging format (tube versus unspecified for the original) and product status (active versus obsolete). This part provides a direct functional replacement with no circuit redesign required.

Similar Substitute (MJE15031G): This substitute shares the same 150 V breakdown voltage and TO-220-3 package but differs in current handling capacity (8 A versus 1.5 A), power dissipation (50 W versus 1.5 W), transition frequency (30 MHz versus 4 MHz), and DC current gain characteristics. The MJE15031G is suitable for applications requiring higher current capacity and power handling within the same voltage class and package footprint.

Parameter Comparison

Parameter	KSA940H2 (Main)	KSA940TU (Direct)	MJE15031G (Similar)
Manufacturer	onsemi	onsemi	onsemi
Transistor Type	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	150 V	150 V	150 V
Current - Collector (Ic) (Max)	1.5 A	1.5 A	8 A
Vce Saturation (Max) @ Ib, Ic	1.5V @ 50mA, 500mA	1.5V @ 50mA, 500mA	500mV @ 100mA, 1A
Current - Collector Cutoff (Max)	10µA	10µA	100µA
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 500mA, 10V	40 @ 500mA, 10V	20 @ 4A, 2V
Power - Max	1.5 W	1.5 W	50 W
Frequency - Transition	4 MHz	4 MHz	30 MHz
Operating Temperature (Max)	150°C	150°C	150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

KSA940TU Selection: This part is the primary substitute for the KSA940H2. It maintains identical electrical performance specifications and is classified as active product status with ROHS3 compliance. The KSA940TU is suitable for direct replacement in existing designs without circuit modification. Inventory availability is significantly higher (35,250 pcs) compared to the original part (1,081 pcs), ensuring supply chain continuity.

MJE15031G Selection: This part is applicable only when circuit requirements permit higher current capacity (8 A versus 1.5 A) and increased power dissipation (50 W versus 1.5 W). The MJE15031G operates at higher transition frequency (30 MHz versus 4 MHz) and exhibits different saturation voltage and current gain characteristics. This substitute requires circuit analysis to confirm compatibility with existing biasing networks and load conditions. The MJE15031G is active product status with ROHS3 compliance and REACH unaffected designation.

Both substitute parts maintain the same 150 V breakdown voltage rating and TO-220-3 package configuration, ensuring mechanical and thermal interface compatibility with existing PCB layouts and heatsinking arrangements.

Frequently Asked Questions (FAQ)

Q: Can KSA940TU be used as a direct replacement for KSA940H2 without circuit modification?

A: Yes. The KSA940TU maintains identical electrical specifications including 150 V breakdown voltage, 1.5 A maximum collector current, 1.5 W power dissipation, 4 MHz transition frequency, and DC current gain characteristics. The only differences are packaging format and product status. No circuit redesign is required.

Q: What are the key differences between KSA940TU and MJE15031G?

A: The KSA940TU is a direct electrical equivalent to the KSA940H2. The MJE15031G differs in current capacity (8 A versus 1.5 A), power dissipation (50 W versus 1.5 W), transition frequency (30 MHz versus 4 MHz), saturation voltage (500 mV versus 1.5 V), and current gain characteristics. Both share the same 150 V breakdown voltage and TO-220-3 package.

Q: Is the MJE15031G suitable for all applications using KSA940H2?

A: No. The MJE15031G is suitable only for applications where higher current capacity and power dissipation are acceptable or required. Applications with strict current or power limitations must use KSA940TU. Circuit analysis is necessary to confirm compatibility with existing biasing networks.

Q: Are both substitute parts compliant with current regulatory standards?

A: Yes. Both KSA940TU and MJE15031G are ROHS3 compliant and REACH unaffected. The KSA940H2 is classified as obsolete and does not specify RoHS compliance status.

Q: What is the package compatibility between these parts?

A: All three parts (KSA940H2, KSA940TU, and MJE15031G) use the TO-220-3 through-hole package. They are mechanically and thermally compatible with existing PCB layouts and heatsinking arrangements.

Q: Why is the KSA940H2 classified as obsolete?

A: The KSA940H2 is no longer in active production. The KSA940TU serves as the active equivalent and is the recommended replacement for new designs and production runs.

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