MPSA18RLRPG Equivalent & Substitute Parts

Part Overview

The MPSA18RLRPG is a Bipolar (BJT) NPN transistor manufactured by onsemi, rated for 45 V collector-emitter breakdown voltage and 200 mA maximum collector current. This device is packaged in a Through Hole TO-92 (TO-226-3) configuration and is rated for 625 mW maximum power dissipation with a transition frequency of 160 MHz. The MPSA18RLRPG is classified as an Obsolete product. Identification of equivalent and substitute parts is necessary to support ongoing design requirements and ensure component availability for production and maintenance applications.

Substiute Parts

MPSA18RLRPG

onsemiIn Stock: 715MPSA18RLRPG Datasheet

Current PartRFQ

2N4401BU

onsemiIn Stock: 99862N4401BU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MPSA18RLRPG is determined by the following critical parameters: transistor type (NPN), mounting configuration (Through Hole TO-92), maximum power dissipation (625 mW), and operating temperature range (-55°C to 150°C). A substitute part must maintain compatibility with these core specifications to ensure functional equivalence in the target application.

The 2N4401BU is identified as a substitute part. While this device exhibits different electrical ratings in certain parameters (40 V breakdown voltage versus 45 V, 600 mA maximum collector current versus 200 mA, and 250 MHz transition frequency versus 160 MHz), it shares the same physical package (TO-92-3), identical maximum power dissipation (625 mW), matching operating temperature range (-55°C to 150°C), and identical transistor type (NPN). The substitute part is classified as Active product status, ensuring ongoing availability and support.

Parameter Comparison

Engineering Selection Recommendations

The 2N4401BU is suitable as a substitute for the MPSA18RLRPG in applications where the electrical parameter differences are accommodated by circuit design. The substitute part is manufactured by the same supplier (onsemi) and maintains identical physical packaging (TO-92-3) and thermal operating range (-55°C to 150°C). The 2N4401BU is classified as Active product status, ensuring long-term availability and manufacturing support.

Circuit designs utilizing the MPSA18RLRPG must account for the following parameter deviations when implementing the 2N4401BU: the collector-emitter breakdown voltage is reduced from 45 V to 40 V, the maximum collector current is increased from 200 mA to 600 mA, and the transition frequency is increased from 160 MHz to 250 MHz. These differences require verification that the application circuit operates within the reduced voltage rating and that the increased current capability does not introduce unintended circuit behavior.

Both devices carry REACH Unaffected status and EAR99 ECCN classification. The MPSA18RLRPG carries Moisture Sensitivity Level (MSL) 1 (Unlimited), while the 2N4401BU is classified as Not Applicable for MSL.

Frequently Asked Questions (FAQ)

Q: Can the 2N4401BU directly replace the MPSA18RLRPG in all applications?

A: Direct replacement is possible only in applications where the circuit operates at collector-emitter voltages of 40 V or lower. The MPSA18RLRPG is rated for 45 V breakdown voltage, while the 2N4401BU is rated for 40 V. Circuit designs must be evaluated to confirm voltage compliance.

Q: What are the physical package differences between these parts?

A: Both the MPSA18RLRPG and 2N4401BU use identical TO-92-3 (TO-226-3) Through Hole packaging. No physical modifications to printed circuit board layouts or component mounting are required.

Q: How do the current ratings differ between these transistors?

A: The MPSA18RLRPG is rated for a maximum collector current of 200 mA, while the 2N4401BU is rated for 600 mA. Applications designed for the lower current rating of the MPSA18RLRPG will operate within the safe operating area of the 2N4401BU. Applications requiring currents between 200 mA and 600 mA must use the 2N4401BU.

Q: Are there frequency response differences?

A: The MPSA18RLRPG has a transition frequency of 160 MHz, while the 2N4401BU has a transition frequency of 250 MHz. The higher frequency capability of the 2N4401BU does not prevent its use in lower-frequency applications.

Q: What is the product availability status of each part?

A: The MPSA18RLRPG is classified as Obsolete. The 2N4401BU is classified as Active, indicating ongoing manufacturing and supplier support.

Q: Are there compliance or regulatory differences?

A: Both parts carry REACH Unaffected status and EAR99 ECCN classification. The MPSA18RLRPG carries Moisture Sensitivity Level 1 (Unlimited), while the 2N4401BU is classified as Not Applicable for MSL. Both devices operate across the identical temperature range of -55°C to 150°C.