MPSA44-AP Equivalent & Substitute Parts Reference

Part Overview

The MPSA44-AP is an NPN bipolar junction transistor (BJT) from Micro Commercial Co, featuring a collector-emitter voltage rating of 400 V, a maximum collector current of 300 mA, and a 625 mW power dissipation capability in a TO-92 package. This part is categorized under “Transistors, Bipolar (BJT)” and designed for through-hole mounting. The product status is “Obsolete,” which necessitates the identification of suitable alternative models with matching key parameters for use in existing and new designs requiring similar electrical and mechanical characteristics.

Substiute Parts

MPSA44-AP

Micro Commercial CoIn Stock: 975MPSA44-AP Datasheet

Current PartRFQ

KSP44TA

onsemiIn Stock: 171471KSP44TA Datasheet

DirectRFQ

KSP44TF

onsemiIn Stock: 105401KSP44TF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute and equivalent part selection for the MPSA44-AP is based exclusively on explicit matching of the following key parameters: transistor type (NPN), collector current rating (300 mA), collector-emitter voltage rating (400 V), Vce saturation (750 mV @ 5mA, 50mA), DC current gain (hFE) (min 50 @ 10mA, 10V), power dissipation (625 mW), through-hole mounting, and TO-92 package form factor. Compliance status, such as RoHS3, is also included to ensure regulatory compatibility. Substitute parts are selected without extrapolation, strictly adhering to these specified parameters.

Parameter Comparison

Engineering Selection Recommendations

The MPSA44-AP is classified as “Obsolete.” Both KSP44TA and KSP44TF are listed as “Active” and are ROHS3 Compliant, matching the original part's environmental compliance requirements. No differences in the critical electrical and mechanical parameters required for substitution exist outside the explicitly provided parameter set. Selection can be based on compliance status and inventory availability within the given supply chain data.

Frequently Asked Questions (FAQ)

Q1: What are the essential parameters for selecting a substitute for the MPSA44-AP?
A1: Substitute selection is based on transistor type, collector-emitter voltage rating, collector current rating, DC current gain (hFE), power dissipation, Vce(sat) value at specified Ib and Ic, mounting style, package type, and RoHS compliance.

Q2: Are package and lead form factors identical in these substitute parts?
A2: All referenced parts have TO-226-3, TO-92-3 (TO-226AA) Formed Leads, and are designed for through-hole mounting, consistent with the original MPSA44-AP.

Q3: Is compliance with RoHS standards maintained across all substitute parts?
A3: The MPSA44-AP, KSP44TA, and KSP44TF are all ROHS3 Compliant.

Q4: Are there differences in the electrical ratings among these parts?
A4: All substitutes match the main parameters, including collector-emitter voltage, collector current, DC current gain, power dissipation, and Vce(sat) specification. The collector cutoff current for substitutes is 500nA versus 100nA for the original; all other parameters are fully aligned per the provided input.

Q5: Does inventory or product status affect suitability as a substitute?
A5: The MPSA44-AP is marked “Obsolete,” while KSP44TA and KSP44TF are listed as “Active,” making them suitable alternatives when availability is a consideration.