MPSA42RLRP Equivalent & Substitute Parts

Part Overview

The MPSA42RLRP is a Bipolar (BJT) NPN transistor manufactured by onsemi, rated for 300 V collector-emitter breakdown voltage and 500 mA maximum collector current. This device is packaged in a Through Hole TO-92 (TO-226-3) configuration with a maximum power dissipation of 625 mW and transition frequency of 50 MHz. The MPSA42RLRP is classified as obsolete, making identification of equivalent substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

MPSA42RLRP

onsemiIn Stock: 698MPSA42RLRP Datasheet

Current PartRFQ

KSP42TA

onsemiIn Stock: 55353KSP42TA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MPSA42RLRP is determined by strict equivalence across the following electrical and mechanical parameters:

• Transistor Type: NPN configuration required
• Maximum Collector Current (Ic): 500 mA minimum rating
• Collector-Emitter Breakdown Voltage (Vce(BR)CEO): 300 V minimum rating
• Saturation Voltage (Vce(sat)): 500 mV maximum @ specified test conditions
• Collector Cutoff Current (ICBO): 100 nA maximum
• Maximum Power Dissipation: 625 mW minimum rating
• Transition Frequency (fT): 50 MHz minimum
• Package Type: Through Hole TO-92-3 (TO-226) configuration
• Operating Temperature Range: Support for -55°C to 150°C junction temperature

The KSP42TA meets all specified electrical parameters and maintains mechanical compatibility through identical TO-92-3 Through Hole packaging. The substitute part is classified as Active product status with RoHS3 compliance, providing enhanced procurement availability compared to the obsolete MPSA42RLRP.

Parameter Comparison

Engineering Selection Recommendations

The KSP42TA is a direct electrical and mechanical equivalent to the MPSA42RLRP. Both devices share identical ratings across all critical parameters: collector current, breakdown voltage, saturation voltage, cutoff current, power dissipation, and transition frequency. Both are packaged in Through Hole TO-92-3 (TO-226) configuration, ensuring pin-compatible board-level substitution.

The KSP42TA provides two significant advantages over the obsolete MPSA42RLRP:

1. Product Status: The KSP42TA is classified as Active, ensuring long-term procurement availability and supply chain continuity.
2. Regulatory Compliance: The KSP42TA is RoHS3 compliant, whereas the MPSA42RLRP is RoHS non-compliant. This compliance status is relevant for applications subject to RoHS regulations.

Both parts maintain REACH Unaffected status and share identical ECCN and HTSUS classifications. The KSP42TA is supplied in Cut Tape (CT) packaging format, which is standard for active production components.

Frequently Asked Questions (FAQ)

Q: Can the KSP42TA be used as a direct replacement for the MPSA42RLRP in existing designs?

A: Yes. The KSP42TA is electrically and mechanically equivalent to the MPSA42RLRP across all specified parameters. Both devices are rated for 300 V collector-emitter breakdown voltage, 500 mA maximum collector current, 625 mW power dissipation, and 50 MHz transition frequency. Both are packaged in Through Hole TO-92-3 configuration, enabling direct pin-compatible substitution on printed circuit boards.

Q: What are the key electrical parameters that determine substitution compatibility?

A: Substitution compatibility is determined by equivalence across the following parameters: NPN transistor type, 500 mA maximum collector current, 300 V collector-emitter breakdown voltage, 500 mV saturation voltage at specified test conditions, 100 nA maximum collector cutoff current, 625 mW maximum power dissipation, and 50 MHz minimum transition frequency.

Q: Are there packaging differences between the MPSA42RLRP and KSP42TA?

A: Both devices use identical Through Hole TO-92-3 (TO-226) packaging with formed leads. The primary difference is in supplier packaging format: the MPSA42RLRP is supplied in standard packaging, while the KSP42TA is supplied in Cut Tape (CT) format. This does not affect board-level compatibility or electrical performance.

Q: Why is the KSP42TA preferred over the MPSA42RLRP?

A: The KSP42TA is classified as Active product status, ensuring ongoing availability and supply chain support. The MPSA42RLRP is obsolete, which restricts procurement options. Additionally, the KSP42TA is RoHS3 compliant, whereas the MPSA42RLRP is RoHS non-compliant. For applications subject to RoHS regulations, the KSP42TA is the appropriate selection.

Q: Are there any DC current gain (hFE) differences between these devices?

A: The MPSA42RLRP specifies a minimum DC current gain of 25 @ 1 mA, 10 V. The KSP42TA specifies a minimum DC current gain of 40 @ 30 mA, 10 V. These measurements are taken at different collector current levels and therefore are not directly comparable. Both devices meet the electrical requirements for NPN transistor operation within their specified operating ranges.

Q: What is the operating temperature range for the KSP42TA?

A: The KSP42TA is rated for a maximum junction temperature (TJ) of 150°C. The MPSA42RLRP is rated for -55°C to 150°C. The KSP42TA specification provided does not include a minimum operating temperature; however, both devices are suitable for standard industrial temperature ranges and share the same maximum temperature rating.