KSD288W Equivalent & Substitute Parts

Part Overview

The KSD288W is an NPN bipolar junction transistor manufactured by onsemi, rated for 55 V collector-emitter breakdown voltage and 3 A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The 25 W power dissipation rating and specified saturation characteristics position this transistor for general-purpose switching and amplification applications requiring moderate power handling in standard through-hole form factors.

Substiute Parts

KSD288W

onsemiIn Stock: 897KSD288W Datasheet

Current PartRFQ

TIP31A

Solid State Inc.In Stock: 49340TIP31A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete KSD288W is based on electrical parameter compatibility within the following criteria:

Mandatory Matching Parameters:

• Transistor polarity: NPN
• Mounting type: Through Hole
• Package form factor: TO-220-3 or equivalent TO-220 variant
• Collector current rating: Equal to or greater than 3 A
• Collector-emitter breakdown voltage: Equal to or greater than 55 V
• Power dissipation capability: Equal to or greater than 25 W

The TIP31A meets these substitution criteria through equivalent or superior electrical ratings across all critical parameters while maintaining identical mechanical compatibility and through-hole mounting configuration.

Parameter Comparison

Engineering Selection Recommendations

The TIP31A is a direct functional substitute for the obsolete KSD288W. The TIP31A provides superior electrical performance across multiple parameters: 60 V breakdown voltage exceeds the 55 V requirement, 40 W power rating surpasses the 25 W specification, and identical 3 A collector current capacity maintains current-handling equivalence. Both devices share identical TO-220-3 through-hole packaging, ensuring mechanical and thermal interface compatibility without modification to existing PCB layouts or heat sink mounting arrangements.

The TIP31A carries Active product status with RoHS3 compliance certification, providing long-term availability and regulatory alignment for new designs and production continuity. The KSD288W's Obsolete classification necessitates transition to the TIP31A for sustained component supply and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can the TIP31A directly replace the KSD288W without circuit modification?

A: Yes. The TIP31A meets or exceeds all critical electrical parameters of the KSD288W while maintaining identical TO-220-3 package geometry and through-hole mounting configuration. No circuit redesign is required for direct substitution.

Q: What is the significance of the higher power rating on the TIP31A?

A: The TIP31A's 40 W maximum power dissipation rating compared to the KSD288W's 25 W provides additional thermal margin in applications operating near maximum power levels. This does not alter switching or amplification characteristics but improves reliability in thermally constrained environments.

Q: Are there differences in saturation voltage between these devices?

A: The TIP31A exhibits 1.2 V saturation voltage compared to the KSD288W's 1 V at specified test conditions. This 0.2 V difference is within typical circuit tolerance for switching applications and does not preclude direct substitution in standard switching or amplification circuits.

Q: Does the TIP31A maintain the same thermal characteristics in TO-220-3 packaging?

A: Both devices use identical TO-220-3 through-hole packaging with equivalent thermal interface properties. Heat sink mounting and thermal management strategies remain unchanged between the two devices.

Q: What compliance certifications apply to the TIP31A?

A: The TIP31A is RoHS3 compliant and carries Active product status, ensuring regulatory alignment and long-term manufacturing support. The KSD288W's Obsolete status makes the TIP31A the recommended choice for new designs and ongoing production.