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KSD73O Equivalent & Substitute Parts
Part Overview
The KSD73O is an NPN bipolar junction transistor manufactured by onsemi, rated for 60V collector-emitter breakdown voltage and 5A 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 KSD73O delivers 30W maximum power dissipation with a 20MHz transition frequency, suitable for general-purpose switching and amplification applications requiring moderate voltage and current ratings.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Transistor Type | NPN | — |
| Voltage - Collector Emitter Breakdown (Max) | 60 | V |
| Current - Collector (Ic) (Max) | 5 | A |
| Power - Max | 30 | W |
| Frequency - Transition | 20 | MHz |
| Package / Case | TO-220-3 | — |
| Mounting Type | Through Hole | — |
| Operating Temperature (TJ) | 150 | °C |
Substitute Part Grouping Explanation
Substitution of the KSD73O is determined by electrical and mechanical compatibility within the following criteria:
Electrical Compatibility Requirements:
- Transistor type must be NPN
- Collector-emitter breakdown voltage must equal or exceed 60V
- Maximum collector current must equal or exceed 5A
- Package and mounting type must be TO-220-3 through-hole
Mechanical Compatibility Requirements:
- Identical package designation: TO-220-3
- Identical mounting configuration: Through-hole
The TIP41C meets these substitution criteria with enhanced electrical ratings (100V breakdown voltage, 6A collector current) while maintaining the same physical package and mounting interface. The higher voltage and current ratings of the TIP41C provide design margin for the KSD73O application space.
Parameter Comparison
| Parameter | KSD73O (onsemi) | TIP41C (NTE Electronics) | Unit |
|---|---|---|---|
| Transistor Type | NPN | NPN | — |
| Voltage - Collector Emitter Breakdown (Max) | 60 | 100 | V |
| Current - Collector (Ic) (Max) | 5 | 6 | A |
| Vce Saturation (Max) | 2V @ 500mA, 5A | 1.5V @ 600mA, 6A | V |
| Power - Max | 30 | 2 | W |
| Frequency - Transition | 20 | 3 | MHz |
| Operating Temperature (TJ) | 150 | 150 | °C |
| Package / Case | TO-220-3 | TO-220-3 | — |
| Mounting Type | Through Hole | Through Hole | — |
| Product Status | Obsolete | Active | — |
Engineering Selection Recommendations
The TIP41C is a direct substitute for the KSD73O based on product status and electrical parameter compatibility. The KSD73O is classified as obsolete, whereas the TIP41C maintains active product status with established supply chain availability (105,100 pieces in stock versus 1,100 pieces for the KSD73O). Both devices share identical TO-220-3 package and through-hole mounting specifications, ensuring mechanical interchangeability without PCB redesign.
The TIP41C provides superior electrical ratings across voltage (100V versus 60V) and current (6A versus 5A) parameters, establishing design margin for applications originally specified for the KSD73O. The TIP41C is RoHS3 compliant, supporting modern manufacturing and environmental compliance requirements. Both devices operate at identical maximum junction temperatures (150°C).
Selection of the TIP41C eliminates obsolescence risk while maintaining functional equivalence and improving long-term component availability.
Frequently Asked Questions (FAQ)
Q: Can the TIP41C directly replace the KSD73O without circuit modification?
A: Yes. Both devices are NPN transistors in TO-220-3 packages with identical through-hole mounting. The TIP41C exceeds the KSD73O electrical specifications (100V versus 60V breakdown voltage; 6A versus 5A collector current), ensuring functional compatibility in circuits designed for the KSD73O.
Q: What are the key differences between the KSD73O and TIP41C?
A: The primary differences are product status (KSD73O is obsolete; TIP41C is active), power rating (KSD73O: 30W; TIP41C: 2W), and transition frequency (KSD73O: 20MHz; TIP41C: 3MHz). The TIP41C provides higher voltage and current ratings with lower power dissipation capability and reduced frequency response.
Q: Are there any package or pinout differences between these devices?
A: No. Both devices use the TO-220-3 package with identical through-hole mounting configuration and pinout. No PCB modifications are required for substitution.
Q: Why is the TIP41C recommended despite lower power rating?
A: The TIP41C is recommended due to active product status and established supply availability. The 2W power rating of the TIP41C is sufficient for applications within the electrical parameter envelope of the KSD73O (5A at 60V). Applications requiring the full 30W dissipation capability of the KSD73O require thermal management evaluation independent of device selection.
Q: What compliance certifications apply to the TIP41C?
A: The TIP41C is RoHS3 compliant. Both the KSD73O and TIP41C carry EAR99 export classification and are unaffected by REACH regulations.
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