KSC2073H2 Equivalent & Substitute Parts

Part Overview

The KSC2073H2 is an NPN bipolar junction transistor 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 support and procurement continuity. The KSC2073H2 delivers 25 W maximum power dissipation with a 4 MHz transition frequency, suitable for general-purpose switching and amplification applications requiring moderate voltage and current ratings.

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
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
Frequency - Transition	4	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the KSC2073H2 is determined by electrical and mechanical parameter compatibility within the NPN bipolar junction transistor category. The critical parameters governing substitution are:

Electrical Parameters:

Voltage - Collector Emitter Breakdown (Max): 150 V minimum
Current - Collector (Ic) (Max): 1.5 A minimum
Power - Max: 25 W minimum
Vce Saturation (Max) @ Ib, Ic: 1 V @ 50 mA, 500 mA
DC Current Gain (hFE) (Min) @ Ic, Vce: 40 @ 500 mA, 10 V minimum
Current - Collector Cutoff (Max): 10 µA maximum
Frequency - Transition: 4 MHz minimum
Operating Temperature (TJ): 150°C minimum

Mechanical Parameters:

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

Substitute parts are classified into two categories:

Direct Equivalents: Parts meeting or exceeding all electrical and mechanical parameters with identical or superior ratings.

Similar Substitutes: Parts with comparable electrical performance but with parameter variations that require circuit-level evaluation for specific application contexts.

Parameter Comparison

Parameter	KSC2073H2 (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
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
Frequency - Transition	4 MHz	4 MHz	4 MHz	10 MHz
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): This part is a direct electrical equivalent to the KSC2073H2, matching all critical electrical parameters including voltage, current, power, saturation characteristics, current gain, and transition frequency. The KSC2073TU maintains active product status, ensuring long-term availability and supply chain continuity. This part is the primary substitute for new designs and procurement requiring the KSC2073H2 specification.

KSC2073H2TU (onsemi): This part is a variant of the original KSC2073H2 with identical electrical ratings except for DC Current Gain (hFE) minimum of 60 @ 500 mA, 10 V, which exceeds the original specification of 40. The KSC2073H2TU is packaged in tube format and carries Last Time Buy status, indicating limited future availability. This part is suitable for applications where the higher current gain is acceptable or beneficial. RoHS3 compliance is documented for this variant.

TIP47 (NTE Electronics, Inc): This part is a similar substitute with notable parameter variations. The TIP47 provides higher voltage rating (250 V versus 150 V) and higher power dissipation (40 W versus 25 W), but delivers reduced maximum collector current (1 A versus 1.5 A) and lower DC current gain minimum (30 versus 40). The TIP47 exhibits higher collector cutoff current (1 mA versus 10 µA) and superior transition frequency (10 MHz versus 4 MHz). The TIP47 is RoHS non-compliant. This part is suitable for applications where voltage headroom is prioritized and collector current requirements do not exceed 1 A.

Frequently Asked Questions (FAQ)

Q: Can the KSC2073TU directly replace the KSC2073H2 without circuit modification?

A: Yes. The KSC2073TU is a direct electrical equivalent with identical ratings for voltage, current, power, saturation voltage, current gain, and transition frequency. Both parts use the TO-220-3 through-hole package. No circuit modification is required for substitution.

Q: What is the difference between KSC2073H2 and KSC2073H2TU?

A: Both parts are manufactured by onsemi with identical electrical specifications except for DC Current Gain (hFE) minimum, which is 60 for the KSC2073H2TU versus 40 for the KSC2073H2. The KSC2073H2TU is supplied in tube packaging and carries Last Time Buy status. The higher current gain of the KSC2073H2TU is compatible with applications designed for the original part.

Q: Is the TIP47 a suitable replacement for the KSC2073H2?

A: The TIP47 is a similar substitute with parameter trade-offs. It provides higher voltage and power ratings but reduced collector current capacity (1 A versus 1.5 A) and lower current gain (30 minimum versus 40 minimum). The TIP47 is suitable for applications where maximum collector current does not exceed 1 A and higher voltage rating is beneficial. The TIP47 is RoHS non-compliant, which may affect regulatory compliance requirements.

Q: Why is the KSC2073H2 marked as obsolete?

A: The KSC2073H2 is classified as obsolete by onsemi. The KSC2073TU from Fairchild Semiconductor and the KSC2073H2TU from onsemi are available alternatives with active or Last Time Buy status to support ongoing applications.

Q: Are all substitute parts available in TO-220-3 packaging?

A: Yes. The KSC2073TU, KSC2073H2TU, and TIP47 are all supplied in TO-220-3 through-hole packages, ensuring mechanical compatibility with existing PCB designs.

Q: What is the inventory status of these substitute parts?

A: KSC2073TU (Fairchild) has 91,950 pieces in stock with active product status. KSC2073H2TU (onsemi) has 1,230 pieces in stock with Last Time Buy status. TIP47 (NTE Electronics) has 26,200 pieces in stock with active product status.

Q: Does the higher DC Current Gain of KSC2073H2TU affect circuit performance?

A: The KSC2073H2TU minimum DC Current Gain of 60 @ 500 mA, 10 V exceeds the original specification of 40. Higher current gain reduces base drive requirements for saturation. Circuits designed for the original part will operate within specification with the KSC2073H2TU, as the higher gain provides additional design margin.

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