MPSA42RLRPG Equivalent & Substitute Parts

Part Overview

The MPSA42RLRPG 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 Through Hole TO-92 (TO-226-3) configuration with a maximum power dissipation of 625 mW and transition frequency of 50 MHz.

The MPSA42RLRPG is classified as an obsolete product. Identification of equivalent and substitute parts is necessary to support ongoing maintenance, repair, and redesign activities for legacy equipment and systems utilizing this component.

Substiute Parts

MPSA42RLRPG

onsemiIn Stock: 837MPSA42RLRPG Datasheet

Current PartRFQ

KSP42TA

onsemiIn Stock: 55353KSP42TA Datasheet

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MMBTA42LT1G

onsemiIn Stock: 205291MMBTA42LT1G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MPSA42RLRPG is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Transistor Type: NPN
• Voltage - Collector Emitter Breakdown (Max): 300 V
• Current - Collector (Ic) (Max): 500 mA
• DC Current Gain (hFE) (Min) @ Ic, Vce: 40 @ 30mA, 10V
• Vce Saturation (Max) @ Ib, Ic: 500mV @ 2mA, 20mA
• Current - Collector Cutoff (Max): 100 nA (ICBO)
• Frequency - Transition: 50 MHz

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole or Surface Mount (application-dependent)
• Package / Case: TO-92-3 (direct replacement) or SOT-23-3 (surface mount alternative)

Substitute parts are grouped into two categories:

1. Direct Through Hole Replacement: KSP42TA maintains identical electrical specifications and Through Hole mounting, with active product status and RoHS3 compliance.

2. Surface Mount Alternative: MMBTA42LT1G provides equivalent electrical performance in a Surface Mount SOT-23-3 package, suitable for applications where board-level redesign to surface mount technology is feasible.

Parameter Comparison

Engineering Selection Recommendations

For Direct Through Hole Replacement:

The KSP42TA is the primary substitute for the MPSA42RLRPG in applications requiring Through Hole mounting. Both devices share identical electrical specifications and are manufactured by onsemi. The KSP42TA holds active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The KSP42TA is suitable for direct pin-compatible replacement in existing PCB designs without modification.

For Surface Mount Applications:

The MMBTA42LT1G provides equivalent electrical performance with a Surface Mount SOT-23-3 package. This substitute is appropriate for new designs or redesigned assemblies utilizing surface mount technology. The MMBTA42LT1G maintains active product status and ROHS3 compliance. The maximum power dissipation of 225 mW is lower than the MPSA42RLRPG (625 mW); thermal design verification is required for applications operating at maximum current and voltage ratings.

Compliance and Availability:

Both substitute parts are REACH Unaffected and carry EAR99 classification, matching the regulatory profile of the original MPSA42RLRPG. The KSP42TA and MMBTA42LT1G are actively manufactured and stocked, providing supply chain continuity for legacy system support.

Frequently Asked Questions (FAQ)

Q: Can the KSP42TA be used as a direct replacement for the MPSA42RLRPG without PCB modification?

A: Yes. The KSP42TA is pin-compatible with the MPSA42RLRPG and maintains identical electrical specifications. Both devices use the TO-92-3 Through Hole package with the same pin configuration. No PCB modification is required.

Q: What is the primary difference between the KSP42TA and MMBTA42LT1G?

A: The KSP42TA is a Through Hole device in TO-92-3 package, while the MMBTA42LT1G is a Surface Mount device in SOT-23-3 package. The MMBTA42LT1G has a lower maximum power rating (225 mW versus 625 mW). All other electrical parameters are equivalent.

Q: Can the MMBTA42LT1G be used in a Through Hole application?

A: No. The MMBTA42LT1G is a Surface Mount device and cannot be directly installed in Through Hole PCB designs. PCB redesign to accommodate surface mount technology is required.

Q: Is the MMBTA42LT1G suitable for high-power applications?

A: The MMBTA42LT1G has a maximum power dissipation of 225 mW, compared to 625 mW for the MPSA42RLRPG. Applications requiring sustained operation near maximum current and voltage ratings should use the KSP42TA or verify thermal performance with the MMBTA42LT1G.

Q: Are there any temperature range differences between the substitutes?

A: The KSP42TA operating temperature range extends to 150°C maximum, while the MPSA42RLRPG and MMBTA42LT1G both operate from -55°C to 150°C. For applications requiring the full -55°C lower temperature limit, the MMBTA42LT1G is preferred over the KSP42TA.

Q: What is the product status of each substitute?

A: The MPSA42RLRPG is obsolete. Both KSP42TA and MMBTA42LT1G are active products with current manufacturing and distribution support.

Q: Are both substitutes RoHS compliant?

A: Yes. The KSP42TA and MMBTA42LT1G are both ROHS3 compliant. The MPSA42RLRPG is REACH Unaffected, and both substitutes maintain this regulatory status.