MPSA42_D27Z Equivalent & Substitute Parts

Part Overview

The MPSA42_D27Z 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 designed for through-hole mounting in TO-92-3 package configuration and operates across a temperature range of -55°C to 150°C. The part is currently classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the MPSA42_D27Z is determined by electrical and mechanical parameter equivalence across the following criteria:

Electrical Parameters (Critical for Substitution):

Transistor type: NPN configuration
Maximum collector current: 500 mA
Collector-emitter breakdown voltage: 300 V
Saturation voltage characteristics: 500mV @ 2mA, 20mA
Collector cutoff current: 100nA (ICBO)
DC current gain (hFE): 40 minimum @ 30mA, 10V
Maximum power dissipation: 625 mW
Transition frequency: 50MHz

Mechanical Parameters (Critical for Substitution):

Mounting type: Through Hole
Package designation: TO-92-3 (TO-226AA) with formed leads

Substitute parts must satisfy all electrical parameters within the specified tolerances and maintain mechanical compatibility with the TO-92-3 package footprint. Packaging format (Cut Tape, Tube, or Reel) does not affect electrical or mechanical substitution eligibility.

Parameter Comparison

Parameter	MPSA42_D27Z (onsemi)	KSP42TA (onsemi)	MPSA42 (Diotec)
Transistor Type	NPN	NPN	NPN
Current - Collector (Ic) (Max)	500 mA	500 mA	500 mA
Voltage - Collector Emitter Breakdown (Max)	300 V	300 V	300 V
Vce Saturation (Max) @ Ib, Ic	500mV @ 2mA, 20mA	500mV @ 2mA, 20mA	500mV @ 2mA, 20mA
Current - Collector Cutoff (Max)	100nA (ICBO)	100nA (ICBO)	100nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 30mA, 10V	40 @ 30mA, 10V	40 @ 30mA, 10V
Power - Max	625 mW	625 mW	625 mW
Frequency - Transition	50MHz	50MHz	50MHz
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
Operating Temperature	-55°C ~ 150°C (TJ)	150°C (TJ)	-55°C ~ 150°C (TJ)

Engineering Selection Recommendations

KSP42TA (onsemi): This part is a direct manufacturer substitute with identical electrical specifications and package configuration. The KSP42TA maintains active product status and carries RoHS3 compliance certification. The operating temperature specification lists 150°C maximum, which covers the upper range of the original part. This substitute is suitable for applications requiring active product support and regulatory compliance documentation.

MPSA42 (Diotec Semiconductor): This part is a parametric equivalent offering identical electrical characteristics and package compatibility. The MPSA42 from Diotec maintains active product status and supports the full operating temperature range of -55°C to 150°C, matching the original specification. REACH status is listed as vendor undefined. This substitute is suitable for applications where alternative manufacturer sourcing is acceptable.

Selection between substitute parts should be based on procurement requirements, supply chain preferences, and compliance documentation needs specific to the application.

Frequently Asked Questions (FAQ)

Q: Can KSP42TA replace MPSA42_D27Z in all applications?

A: KSP42TA is electrically and mechanically equivalent to MPSA42_D27Z across all specified parameters. Both devices are NPN transistors with 300 V breakdown voltage, 500 mA maximum collector current, and TO-92-3 package configuration. The primary difference is product status: MPSA42_D27Z is obsolete while KSP42TA is active.

Q: What is the difference between the operating temperature ranges?

A: MPSA42_D27Z specifies -55°C to 150°C operating temperature. KSP42TA lists 150°C as the maximum junction temperature. For applications requiring operation below 0°C, MPSA42 from Diotec Semiconductor provides the full -55°C to 150°C range.

Q: Are there packaging format differences between these parts?

A: MPSA42_D27Z is supplied in standard packaging format. KSP42TA is available in Cut Tape (CT) format. MPSA42 from Diotec is available in Cut Tape (CT) format. All three parts use identical TO-92-3 package configuration with formed leads. Packaging format does not affect electrical or mechanical compatibility.

Q: What compliance certifications apply to each substitute?

A: KSP42TA carries RoHS3 compliance certification. MPSA42_D27Z and MPSA42 from Diotec do not list RoHS compliance status. All three parts are REACH unaffected or vendor undefined. Compliance requirements should be verified against specific application standards.

Q: Can these parts be used interchangeably in PCB designs?

A: Yes. All three parts share identical TO-92-3 package footprints with formed leads, enabling direct PCB layout compatibility. No circuit board modifications are required for substitution.

Q: What are the key electrical parameters that must match for substitution?

A: Critical parameters for substitution are: NPN transistor type, 500 mA maximum collector current, 300 V collector-emitter breakdown voltage, 500mV saturation voltage at specified bias conditions, 100nA collector cutoff current, 40 minimum DC current gain at 30mA/10V, 625 mW maximum power dissipation, and 50MHz transition frequency.

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