MPSA42_J22Z Equivalent & Substitute Parts

Part Overview

The MPSA42_J22Z is an NPN bipolar junction transistor manufactured by onsemi, rated for 300 V collector-emitter breakdown voltage and 500 mA maximum collector current. This device is packaged in a TO-92-3 through-hole configuration and is designed for general-purpose switching and amplification applications. The MPSA42_J22Z carries an obsolete product status, making identification of equivalent and substitute components necessary for ongoing design support, maintenance, and production continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	500	mA
Voltage - Collector Emitter Breakdown (Max)	300	V
Vce Saturation (Max) @ Ib, Ic	500 mV @ 2 mA, 20 mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	40 @ 30 mA, 10 V	—
Power - Max	625	mW
Frequency - Transition	50	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—

Substitute Part Grouping Explanation

Substitution of the MPSA42_J22Z is determined by strict equivalence across the following electrical and mechanical parameters:

Transistor Type: NPN configuration
Maximum Collector Current: 500 mA
Collector-Emitter Breakdown Voltage: 300 V
Saturation Voltage: 500 mV @ 2 mA, 20 mA
Collector Cutoff Current: 100 nA (ICBO)
DC Current Gain (hFE): 40 minimum @ 30 mA, 10 V
Maximum Power Dissipation: 625 mW
Transition Frequency: 50 MHz
Package Type: TO-92-3 through-hole configuration

All substitute parts listed below meet these electrical specifications and are compatible with the same PCB footprint and mounting methodology as the MPSA42_J22Z.

Parameter Comparison

Parameter	MPSA42_J22Z (onsemi)	KSP42BU (onsemi)	MPSA42 (Diotec)	MPSA42BK (Diotec)
Transistor Type	NPN	NPN	NPN	NPN
Ic (Max)	500 mA	500 mA	500 mA	500 mA
Vce Breakdown (Max)	300 V	300 V	300 V	300 V
Vce Saturation (Max)	500 mV @ 2 mA, 20 mA	500 mV @ 2 mA, 20 mA	500 mV @ 2 mA, 20 mA	500 mV @ 2 mA, 20 mA
Icbo (Max)	100 nA	100 nA	100 nA	100 nA
hFE (Min) @ Ic, Vce	40 @ 30 mA, 10 V	40 @ 30 mA, 10 V	40 @ 30 mA, 10 V	40 @ 30 mA, 10 V
Power (Max)	625 mW	625 mW	625 mW	625 mW
Frequency - Transition	50 MHz	50 MHz	50 MHz	50 MHz
Operating Temperature	-55 to 150 °C	150 °C	-55 to 150 °C	-55 to 150 °C
Package	TO-92-3	TO-92-3	TO-92	TO-92
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

KSP42BU (onsemi) is the primary substitute for the MPSA42_J22Z. This part maintains full electrical equivalence across all critical parameters and is manufactured by the same supplier as the original component. The KSP42BU carries active product status and is RoHS3 compliant, ensuring long-term availability and regulatory compliance. Inventory availability is substantial at 105,200 pieces.

MPSA42 (Diotec Semiconductor) provides an alternative substitute with identical electrical specifications. This part is supplied in cut tape packaging and maintains active product status. The operating temperature range extends from -55°C to 150°C, matching the original specification. Inventory availability is 27,010 pieces.

MPSA42BK (Diotec Semiconductor) is a secondary substitute supplied in box packaging. This part meets all electrical requirements and maintains active product status. Inventory availability is 20,778 pieces. The operating temperature range is -55°C to 150°C.

All three substitute parts are suitable for direct replacement in applications where the MPSA42_J22Z was originally specified. Selection among substitutes should be based on packaging requirements, supplier preference, and inventory availability for the specific application.

Frequently Asked Questions (FAQ)

Q: Can the KSP42BU replace the MPSA42_J22Z in all applications?

A: Yes. The KSP42BU meets all electrical specifications of the MPSA42_J22Z, including collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency. Both devices use the TO-92-3 package and are pin-compatible.

Q: What is the difference between the MPSA42 (Diotec) and MPSA42BK (Diotec)?

A: Both parts are electrically identical and meet the same specifications as the MPSA42_J22Z. The primary difference is packaging: MPSA42 is supplied in cut tape format, while MPSA42BK is supplied in box format. Selection depends on procurement and assembly requirements.

Q: Are there any compliance or regulatory differences between the substitutes?

A: The KSP42BU is RoHS3 compliant. The Diotec parts (MPSA42 and MPSA42BK) do not have RoHS status specified. All parts are REACH unaffected and carry EAR99 classification. Compliance requirements should be verified against specific application standards.

Q: Does the operating temperature range differ between substitutes?

A: The KSP42BU specifies a maximum operating temperature of 150°C without a minimum value stated. The MPSA42 and MPSA42BK both specify -55°C to 150°C. For applications requiring the full -55°C to 150°C range, the Diotec parts are preferred.

Q: Are all substitutes available in the same package configuration?

A: All substitutes use TO-92-3 or TO-92 through-hole packages, which are mechanically and electrically compatible. The TO-92 and TO-92-3 designations refer to the same physical package with three leads suitable for through-hole PCB mounting.

Q: What inventory levels are available for each substitute?

A: KSP42BU: 105,200 pieces; MPSA42 (Diotec): 27,010 pieces; MPSA42BK (Diotec): 20,778 pieces. Inventory levels should be confirmed at the time of procurement.

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