KSC2073 Equivalent & Substitute Parts

Part Overview

The KSC2073 is an NPN bipolar junction transistor (BJT) manufactured by onsemi, rated for 150 V collector-emitter breakdown voltage and 1.5 A maximum collector current in a TO-220-3 through-hole package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	150	V
Current - Collector (Ic) (Max)	1.5	A
Power - Max	25	W
Frequency - Transition	4	MHz
Vce Saturation (Max) @ Ib, Ic	1 V @ 50 mA, 500 mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 500 mA, 10 V	—
Current - Collector Cutoff (Max)	10	µA
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the KSC2073 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Transistor Type: NPN configuration
Voltage - Collector Emitter Breakdown (Max): minimum 150 V
Current - Collector (Ic) (Max): minimum 1.5 A
Power - Max: minimum 25 W
Vce Saturation (Max) @ Ib, Ic: 1 V @ 50 mA, 500 mA
DC Current Gain (hFE) (Min) @ Ic, Vce: minimum 40 @ 500 mA, 10 V

Mechanical Compatibility Requirements:

Mounting Type: Through Hole
Package / Case: TO-220-3

Parts are classified into two categories:

Direct Equivalents: Parts meeting all electrical parameters within specified tolerances and identical package configuration.

Similar Substitutes: Parts meeting core electrical requirements with variations in secondary parameters (such as higher voltage or frequency ratings) that do not compromise circuit functionality.

Parameter Comparison

Parameter	KSC2073 (onsemi)	KSC2073TU (Fairchild)	KSC2073H2TU (onsemi)	TIP47 (NTE Electronics)
Transistor Type	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	150 V	150 V	150 V	250 V
Current - Collector (Ic) (Max)	1.5 A	1.5 A	1.5 A	1 A
Power - Max	25 W	25 W	25 W	40 W
Frequency - Transition	4 MHz	4 MHz	4 MHz	10 MHz
Vce Saturation (Max) @ Ib, Ic	1 V @ 50 mA, 500 mA	1 V @ 50 mA, 500 mA	1 V @ 50 mA, 500 mA	1 V @ 200 mA, 1 A
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 500 mA, 10 V	40 @ 500 mA, 10 V	60 @ 500 mA, 10 V	30 @ 300 mA, 10 V
Current - Collector Cutoff (Max)	10 µA	10 µA	10 µA	1 mA
Operating Temperature (TJ)	150°C	150°C	150°C	−65°C to 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Last Time Buy	Active

Engineering Selection Recommendations

KSC2073TU (Fairchild Semiconductor) - Direct Equivalent

The KSC2073TU is a direct electrical and mechanical equivalent to the KSC2073. This part maintains identical ratings across all critical parameters: 150 V collector-emitter breakdown voltage, 1.5 A maximum collector current, 25 W power dissipation, and 4 MHz transition frequency. The part is in active production status with substantial inventory availability (91,950 pcs), ensuring supply continuity. This is the primary recommended substitute for direct replacement applications.

KSC2073H2TU (onsemi) - Direct Equivalent with Enhanced Gain

The KSC2073H2TU is manufactured by onsemi and provides identical electrical specifications to the KSC2073 with the exception of DC current gain, which is specified at a minimum of 60 @ 500 mA, 10 V compared to 40 for the original part. This higher gain characteristic does not compromise compatibility and may provide improved circuit performance. The part is classified as Last Time Buy, indicating limited future availability. Packaging is specified as Tube format. RoHS3 compliance is confirmed.

TIP47 (NTE Electronics, Inc) - Similar Substitute with Parameter Variations

The TIP47 is a similar substitute suitable for applications where the KSC2073 specifications can accommodate higher voltage and power ratings. The TIP47 is rated for 250 V collector-emitter breakdown voltage (versus 150 V), 1 A maximum collector current (versus 1.5 A), and 40 W power dissipation (versus 25 W). The transition frequency is 10 MHz, higher than the KSC2073's 4 MHz. The collector cutoff current is specified at 1 mA, which is higher than the KSC2073's 10 µA specification. The part is in active production with high inventory availability (26,200 pcs). This substitute is applicable only when circuit design permits the noted parameter variations and does not require the full 1.5 A collector current capability.

Frequently Asked Questions (FAQ)

Q: Can the KSC2073TU be used as a direct replacement for the KSC2073?

A: Yes. The KSC2073TU meets all electrical and mechanical specifications of the KSC2073, including voltage rating (150 V), current rating (1.5 A), power dissipation (25 W), and package configuration (TO-220-3). The part is in active production status.

Q: What is the difference between KSC2073H2TU and KSC2073?

A: The KSC2073H2TU is electrically equivalent to the KSC2073 with one exception: the minimum DC current gain (hFE) is specified at 60 @ 500 mA, 10 V, compared to 40 for the original part. All other parameters are identical. The KSC2073H2TU is supplied in Tube packaging and is classified as Last Time Buy.

Q: Is the TIP47 a suitable substitute for the KSC2073?

A: The TIP47 is a similar substitute only for applications where the following parameter variations are acceptable: maximum collector current of 1 A (versus 1.5 A), collector-emitter breakdown voltage of 250 V (versus 150 V), and collector cutoff current of 1 mA (versus 10 µA). The TIP47 is not suitable for applications requiring the full 1.5 A collector current specification.

Q: What is the package configuration for all substitute parts?

A: All substitute parts (KSC2073TU, KSC2073H2TU, and TIP47) are supplied in TO-220-3 through-hole package configuration, maintaining mechanical compatibility with the original KSC2073.

Q: Why is the KSC2073 classified as obsolete?

A: The KSC2073 is no longer in active production. The KSC2073TU (Fairchild Semiconductor) and KSC2073H2TU (onsemi) are the recommended active alternatives for new designs and production continuity.

Q: Are there compliance or certification differences between the substitute parts?

A: The KSC2073H2TU is confirmed RoHS3 compliant. The KSC2073TU and TIP47 compliance status is not specified in the provided data. All parts are classified as REACH Unaffected or have REACH Unaffected status where specified.

Q: What inventory status should be considered when selecting a substitute?

A: The KSC2073TU has the highest inventory availability at 91,950 pcs. The KSC2073H2TU is classified as Last Time Buy with 1,230 pcs available. The TIP47 has 26,200 pcs available. For long-term supply assurance, the KSC2073TU is the preferred selection.

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