MPSA42_D74Z Equivalent & Substitute Parts

Part Overview

The MPSA42_D74Z 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_D74Z carries an obsolete product status, making identification of equivalent and substitute parts essential for design continuity and procurement planning. Active alternatives with identical electrical specifications are available from multiple manufacturers.

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_D74Z is determined by strict equivalence across the following electrical and mechanical parameters:

Transistor Type: NPN configuration
Maximum Collector Current (Ic): 500 mA
Collector-Emitter Breakdown Voltage (VCEO): 300 V
Saturation Voltage (Vce Sat): 500 mV @ 2 mA, 20 mA
Collector Cutoff Current (ICBO): 100 nA
DC Current Gain (hFE): 40 minimum @ 30 mA, 10 V
Maximum Power Dissipation: 625 mW
Transition Frequency: 50 MHz
Operating Temperature Range: -55°C to 150°C
Package Type: TO-92-3 through-hole configuration

All substitute parts listed below meet these specifications without deviation. Substitution is valid only when all parameters match or exceed the requirements of the original MPSA42_D74Z.

Parameter Comparison

Parameter	MPSA42_D74Z (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	500 mV @ 2 mA, 20 mA	500 mV @ 2 mA, 20 mA	500 mV @ 2 mA, 20 mA
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 30 mA, 10 V	40 @ 30 mA, 10 V	40 @ 30 mA, 10 V
Power - Max	625 mW	625 mW	625 mW
Frequency - Transition	50 MHz	50 MHz	50 MHz
Operating Temperature Range	-55°C to 150°C	Up to 150°C	-55°C to 150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

KSP42TA (onsemi) is a direct parametric equivalent with active product status. This part carries ROHS3 compliance certification and is available in high inventory quantities (55,300 pcs). The KSP42TA is supplied in cut tape packaging and maintains all electrical specifications identical to the MPSA42_D74Z. Selection of the KSP42TA is appropriate for new designs and production continuity where onsemi sourcing is preferred.

MPSA42 (Diotec Semiconductor) is a direct parametric equivalent with active product status. This part maintains the full operating temperature range (-55°C to 150°C) and all electrical specifications of the original MPSA42_D74Z. The MPSA42 from Diotec is available in high inventory quantities (27,010 pcs) and is supplied in cut tape packaging. Selection of the Diotec MPSA42 is appropriate when alternative manufacturer sourcing is required for supply chain resilience.

Both substitute parts are electrically and mechanically interchangeable with the MPSA42_D74Z in TO-92-3 through-hole applications. Selection between KSP42TA and MPSA42 (Diotec) should be based on procurement requirements, supply chain strategy, and manufacturer preference.

Frequently Asked Questions (FAQ)

Q: Can the KSP42TA replace the MPSA42_D74Z in existing designs?

A: Yes. The KSP42TA meets all electrical specifications of the MPSA42_D74Z, including collector current (500 mA), breakdown voltage (300 V), saturation voltage (500 mV), current gain (40 minimum), power dissipation (625 mW), and transition frequency (50 MHz). Both devices use identical TO-92-3 through-hole packaging with formed leads. Direct substitution is valid without circuit modification.

Q: What is the difference between the KSP42TA and the Diotec MPSA42?

A: Both parts are parametric equivalents with identical electrical specifications. The primary differences are manufacturer (onsemi vs. Diotec), packaging format (cut tape vs. cut tape), and compliance certifications. The KSP42TA carries ROHS3 compliance; the Diotec MPSA42 RoHS status is not applicable. Both are suitable for direct substitution.

Q: Does the operating temperature range differ between substitutes?

A: The KSP42TA specification indicates operation up to 150°C maximum junction temperature. The MPSA42_D74Z and Diotec MPSA42 both specify -55°C to 150°C operating range. For applications requiring the full -55°C lower temperature limit, the Diotec MPSA42 is the preferred selection.

Q: Are there packaging differences between the MPSA42_D74Z and substitute parts?

A: All three parts use TO-92-3 through-hole packaging with formed leads (TO-226AA). The MPSA42_D74Z and Diotec MPSA42 are supplied in standard through-hole format. The KSP42TA is supplied in cut tape packaging. Physical dimensions and lead configuration are identical; packaging format affects only handling and automated assembly compatibility.

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

A: Yes. All three parts share identical TO-92-3 package geometry and lead spacing. PCB footprints designed for the MPSA42_D74Z accommodate the KSP42TA and Diotec MPSA42 without modification. Lead forming and insertion characteristics are equivalent across all three parts.

Q: What compliance certifications apply to each substitute?

A: The KSP42TA carries ROHS3 compliance and REACH Unaffected status. The Diotec MPSA42 RoHS status is not applicable; REACH status is vendor undefined. The MPSA42_D74Z carries REACH Unaffected status. All three parts are classified under ECCN EAR99 and HTSUS 8541.21.0095.

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