KSC2073H2TSTU Equivalent & Substitute Parts

Part Overview

The KSC2073H2TSTU is an NPN bipolar junction transistor manufactured by onsemi, rated for 150V collector-emitter breakdown voltage and 1.5A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. The part delivers 25W maximum power dissipation with a 4MHz transition frequency, suitable for general-purpose switching and amplification applications in power electronics.

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	1V @ 50mA, 500mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 500mA, 10V	—
Current - Collector Cutoff (Max)	10µA	—
Package / Case	TO-220-3	—
Mounting Type	Through Hole	—
Operating Temperature (Max)	150	°C

Substitute Part Grouping Explanation

Substitution eligibility for the KSC2073H2TSTU is determined by the following critical parameters: transistor type (NPN), package configuration (TO-220-3 through-hole), and electrical ratings within acceptable operating ranges. Substitute parts must maintain compatibility across voltage rating, current capacity, power dissipation, and thermal characteristics.

Substitutes are classified into two categories:

Direct Equivalents maintain identical or near-identical electrical specifications and are pin-compatible replacements. These parts satisfy the original design requirements without circuit modification.

Similar Alternatives provide enhanced or alternative electrical characteristics while maintaining the same package and basic functional classification. These parts may require circuit evaluation to confirm suitability for specific applications.

The following parameters establish substitution boundaries:

Collector-emitter breakdown voltage must equal or exceed 150V
Maximum collector current must equal or exceed 1.5A
Maximum power dissipation must equal or exceed 25W
Package must be TO-220-3 through-hole configuration
Transistor type must be NPN

Parameter Comparison

Parameter	KSC2073H2TSTU	KSC2073TU	BU406G	TIP47
Manufacturer	onsemi	Fairchild Semiconductor	onsemi	NTE Electronics, Inc
Product Status	Obsolete	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	150V	150V	200V	250V
Current - Collector (Ic) (Max)	1.5A	1.5A	7A	1A
Power - Max	25W	25W	60W	40W
Frequency - Transition	4MHz	4MHz	10MHz	10MHz
Vce Saturation (Max) @ Ib, Ic	1V @ 50mA, 500mA	1V @ 50mA, 500mA	1V @ 500mA, 5A	1V @ 200mA, 1A
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 500mA, 10V	40 @ 500mA, 10V	Not specified	30 @ 300mA, 10V
Current - Collector Cutoff (Max)	10µA	10µA	5mA	1mA
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature (Max)	150°C	150°C	150°C	150°C

Engineering Selection Recommendations

KSC2073TU is the primary direct equivalent for the KSC2073H2TSTU. This part is manufactured by Fairchild Semiconductor and maintains identical electrical specifications including 150V breakdown voltage, 1.5A collector current, 25W power rating, and 4MHz transition frequency. The KSC2073TU is currently in active production status, ensuring supply continuity and availability. Both parts share identical saturation voltage characteristics and DC current gain parameters. This substitute requires no circuit modification and provides direct functional replacement.

BU406G is an enhanced alternative manufactured by onsemi. This device exceeds the original specifications with 200V breakdown voltage, 7A collector current capability, and 60W power dissipation. The BU406G operates at 10MHz transition frequency, providing improved switching performance. This part is suitable for applications requiring higher current capacity or voltage margin. Circuit evaluation is necessary to confirm compatibility with existing thermal management and current-limiting designs.

TIP47 is a similar alternative manufactured by NTE Electronics, Inc. This device provides 250V breakdown voltage and 40W power dissipation, exceeding the original voltage rating. However, the TIP47 is rated for 1A maximum collector current, which is below the 1.5A requirement of the original part. The TIP47 operates at 10MHz transition frequency. This substitute is applicable only to applications where collector current does not exceed 1A.

Selection priority is based on product status and specification alignment: KSC2073TU for direct replacement, BU406G for enhanced performance requirements, and TIP47 for voltage-margin applications with reduced current demands.

Frequently Asked Questions (FAQ)

Q: Can KSC2073TU be used as a direct replacement for KSC2073H2TSTU?

A: Yes. The KSC2073TU maintains identical electrical specifications including 150V breakdown voltage, 1.5A maximum collector current, 25W power dissipation, and 4MHz transition frequency. Both parts are NPN transistors in TO-220-3 through-hole packages with matching saturation voltage and DC current gain characteristics. No circuit modification is required.

Q: What is the primary difference between KSC2073H2TSTU and BU406G?

A: The BU406G provides enhanced electrical ratings: 200V breakdown voltage (versus 150V), 7A collector current (versus 1.5A), and 60W power dissipation (versus 25W). The BU406G also operates at 10MHz transition frequency compared to 4MHz. Both parts are NPN transistors in TO-220-3 packages. The BU406G is suitable for applications requiring higher current capacity or voltage headroom.

Q: Is TIP47 suitable for all applications using KSC2073H2TSTU?

A: No. The TIP47 is rated for 1A maximum collector current, which is below the 1.5A specification of the KSC2073H2TSTU. The TIP47 is applicable only to applications where collector current does not exceed 1A. The TIP47 does provide higher voltage rating (250V) and power dissipation (40W).

Q: Are all substitute parts available in the same package configuration?

A: Yes. The KSC2073H2TSTU, KSC2073TU, BU406G, and TIP47 are all configured in TO-220-3 through-hole packages. All parts are pin-compatible and require identical mounting and thermal management approaches.

Q: What compliance certifications apply to these substitute parts?

A: The KSC2073TU and BU406G are manufactured by onsemi and Fairchild Semiconductor respectively, with REACH Unaffected status. The TIP47 is RoHS non-compliant. All parts carry EAR99 ECCN classification. Compliance requirements for specific applications must be verified against design specifications.

Q: Can BU406G be used in circuits designed for 1.5A operation?

A: Yes. The BU406G is rated for 7A maximum collector current, which exceeds the 1.5A requirement. The part will operate safely at 1.5A. However, thermal management design must account for the higher power dissipation capability (60W versus 25W) to prevent unintended thermal effects in the circuit.

Q: What is the inventory status of substitute parts?

A: KSC2073TU has 91,950 pieces in stock. BU406G has 1,427 pieces in stock. TIP47 has 26,200 pieces in stock. The original KSC2073H2TSTU has 5,039 pieces in stock but is classified as obsolete.

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