MPSA42,412 Equivalent & Substitute Parts Reference

Part Overview

The MPSA42,412 from NXP USA Inc. is a high-voltage NPN bipolar junction transistor (BJT) designed for through-hole mounting in the TO-92-3 package. Key features include a 300 V collector-emitter breakdown voltage, 100 mA maximum collector current, 50 MHz transition frequency, and a maximum power dissipation of 500 mW. With a maximum operating junction temperature of 150°C and ROHS3 compliance, the device is suited for a variety of high-voltage applications. As the MPSA42,412 is now classified as obsolete, it is necessary to identify substitute models with compatible electrical and mechanical parameters to ensure ongoing design support and component availability.

Key Parameters

Parameter	MPSA42,412
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	300 V
Current - Collector (Ic) (Max)	100 mA
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	500 mW
Frequency - Transition	50MHz
Operating Temperature (TJ)	150°C
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Supplier Device Package	TO-92-3
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution is strictly determined by matching the following key electrical and mechanical parameters: transistor type (NPN), collector-emitter breakdown voltage (300 V), collector current rating (100 mA minimum), DC current gain (min 40 @ 30 mA, 10 V), Vce saturation at specified Ib/Ic, maximum cutoff current (ICBO), transition frequency (50 MHz), maximum power dissipation (500 mW or greater), package type (TO-92-3 or equivalent), mounting type (through hole), and compliance with relevant RoHS and REACH statuses if required. Substitute parts must align with all listed criteria without deviation.

Parameter Comparison

Parameter	MPSA42,412 (NXP USA Inc.)	KSP42BU (onsemi)	MPSA42 (Diotec Semiconductor)
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	300 V	300 V	300 V
Current - Collector (Ic) (Max)	100 mA	500 mA	500 mA
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	500 mW	625 mW	625 mW
Frequency - Transition	50MHz	50MHz	50MHz
Operating Temperature (TJ)	150°C	150°C	150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	TO-226-3, TO-92-3 (TO-226AA)	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Supplier Device Package	TO-92-3	TO-92-3	TO-92
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not applicable

Engineering Selection Recommendations

When selecting a substitute for the obsolete MPSA42,412, confirm the product status (active or obsolete) and environmental compliance (e.g., RoHS3, REACH) based on current application requirements. Both the KSP42BU (onsemi) and the MPSA42 (Diotec Semiconductor) are active, with the KSP42BU offering ROHS3 compliance matching that of the original part. Other certifications such as ECCN and REACH status should also be verified for alignment within the intended use environment.

Frequently Asked Questions (FAQ)

Q1: What criteria are used to select substitute BJTs for the MPSA42,412?
A1: Substitution is determined by matching the key electrical parameters (transistor type, collector-emitter breakdown voltage, collector current, Vce(sat), cutoff current, DC gain, transition frequency, power rating) and mechanical/package requirements (TO-92-3 through-hole package), as well as relevant regulatory compliance.

Q2: Are the KSP42BU and Diotec MPSA42 electrically compatible with the NXP MPSA42,412?
A2: Based on provided specifications, both substitute parts are NPN transistors with equal or improved ratings for voltage, current, gain, and frequency, ensuring compatibility within specified parameter tolerances.

Q3: Does the physical package of the substitutes match the original MPSA42,412?
A3: All listed parts use the TO-92 or TO-226-3 (TO-226AA) through-hole package format, consistent with the original component’s mechanical specifications.

Q4: Should environmental compliance such as RoHS and REACH be verified when selecting a substitute?
A4: Yes. If adherence to RoHS3, REACH, or other regulations is required, only substitute parts with explicit matching compliance status should be selected.

Q5: Are there differences in maximum collector current or power rating among substitutes?
A5: Both substitutes have greater collector current and power dissipation than the original, while maintaining all other listed electrical parameters.

Q6: Is the frequency performance consistent across these substitutes?
A6: All parts list a transition frequency of 50 MHz, matching the original device’s specification.

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