KSC5039H2 Equivalent & Substitute Parts

Part Overview

The KSC5039H2 is an NPN bipolar junction transistor manufactured by onsemi, rated for 400 V collector-emitter breakdown voltage and 5 A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility within the specified parameter ranges while accommodating the through-hole TO-220 package family.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	400	V
Current - Collector (Ic) (Max)	5	A
Power - Max	70	W
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the KSC5039H2 is determined by the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (required match)
Voltage - Collector Emitter Breakdown (Max): minimum 400 V (equal or higher acceptable)
Current - Collector (Ic) (Max): minimum 5 A (equal or higher acceptable)
Power - Max: minimum 70 W (equal or higher acceptable)
Operating Temperature: 150°C (TJ) (equal or higher acceptable)
Mounting Type: Through Hole (required match)
Package / Case: TO-220-3 family (required match)

Substitute parts are grouped into two categories based on their electrical ratings relative to the KSC5039H2:

Category A - Direct Electrical Equivalents: Parts meeting or exceeding all primary criteria with minimal parameter variance.

Category B - Functional Equivalents: Parts with higher voltage or current ratings that provide enhanced performance margins while maintaining compatibility within the TO-220-3 package family.

Parameter Comparison

Part Number	Manufacturer	Voltage - Collector Emitter Breakdown (Max) [V]	Current - Collector (Ic) (Max) [A]	Power - Max [W]	Operating Temperature (TJ) [°C]	Package / Case	Product Status
KSC5039H2	onsemi	400	5	70	150	TO-220-3	Obsolete
TSC742CZ C0G	Taiwan Semiconductor Corporation	420	5	70	150	TO-220-3	Active
BUJ103A,127	WeEn Semiconductors	400	4	80	150	TO-220-3	Active
BUL38D	STMicroelectronics	450	5	80	150	TO-220-3	Active
BUL49D	STMicroelectronics	450	5	80	150	TO-220-3	Active
BUL742C	STMicroelectronics	400	4	70	150	TO-220-3	Active
PHD13005,127	WeEn Semiconductors	400	4	75	150	TO-220-3	Active
ST13005	STMicroelectronics	400	4	75	150	TO-220-3	Active

Engineering Selection Recommendations

Category A - Direct Electrical Equivalents (Recommended Primary Substitutes):

TSC742CZ C0G (Taiwan Semiconductor Corporation) provides the closest electrical match to the KSC5039H2. This part maintains 5 A collector current capacity, 70 W power rating, and 150°C operating temperature. The voltage rating of 420 V exceeds the original 400 V specification, providing additional design margin. Product status is active with ROHS3 compliance and REACH unaffected designation.

BUL38D (STMicroelectronics) offers enhanced electrical performance with 450 V breakdown voltage and 5 A collector current, matching the original current specification. Power rating increases to 80 W, providing additional thermal margin. Product status is active with ROHS3 compliance, unlimited moisture sensitivity level, and REACH unaffected designation. High inventory availability (8725 units) supports supply chain continuity.

Category B - Functional Equivalents (Secondary Substitutes):

BUL742C (STMicroelectronics) maintains 400 V voltage rating and 70 W power rating identical to the KSC5039H2. Collector current is rated at 4 A, which is 1 A below the original specification. This part is suitable for applications where the full 5 A current capacity is not required. Product status is active with ROHS3 compliance and extensive inventory availability (25200 units).

PHD13005,127 (WeEn Semiconductors) and ST13005 (STMicroelectronics) both provide 400 V voltage rating with 4 A collector current and 75 W power rating. These parts are suitable for reduced-current applications. Both maintain active product status with ROHS3 compliance.

BUJ103A,127 (WeEn Semiconductors) provides 400 V voltage rating with 80 W power rating but is limited to 4 A collector current. This part is appropriate for applications not requiring the full 5 A specification. Product status is active with RoHS compliance and unlimited moisture sensitivity level.

BUL49D (STMicroelectronics) offers enhanced voltage rating of 450 V with 5 A collector current and 80 W power rating. This part provides the highest performance margin among available substitutes. Product status is active with ROHS3 compliance and good inventory availability (6200 units).

Frequently Asked Questions (FAQ)

Q: Can TSC742CZ C0G directly replace KSC5039H2 in all applications?

A: TSC742CZ C0G meets or exceeds all primary electrical parameters of the KSC5039H2 (400 V minimum, 5 A collector current, 70 W power, 150°C operating temperature) and shares the TO-220-3 package. Direct substitution is supported within the specified electrical operating range. Verify circuit design does not depend on specific DC current gain (hFE) characteristics, as this parameter differs between parts.

Q: What is the difference between BUL38D and BUL49D?

A: Both BUL38D and BUL49D are manufactured by STMicroelectronics with identical voltage (450 V) and current (5 A) ratings in the TO-220-3 package. Primary differences exist in saturation voltage characteristics and DC current gain specifications. Both parts provide equivalent substitution capability for the KSC5039H2. Selection between these parts depends on specific circuit saturation voltage requirements.

Q: Why do some substitute parts have 4 A collector current instead of 5 A?

A: Parts such as BUL742C, PHD13005,127, ST13005, and BUJ103A,127 are rated for 4 A maximum collector current, which is 1 A below the KSC5039H2 specification. These parts are suitable for applications where the circuit design does not require the full 5 A capacity. Circuit analysis must confirm that maximum operating current does not exceed 4 A for these substitutes.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed carry either ROHS3 Compliant or RoHS Compliant designations. The KSC5039H2 is classified as obsolete and does not carry RoHS certification. Substitution with RoHS-compliant parts supports compliance with current environmental regulations.

Q: What is the significance of moisture sensitivity level (MSL) differences?

A: The KSC5039H2 carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Most substitute parts also carry MSL 1 (Unlimited), with the exception of TSC742CZ C0G, which carries MSL 3 (168 Hours). MSL 3 designation requires controlled storage and handling conditions with a 168-hour floor life after moisture exposure. Selection of MSL 1 parts (BUL38D, BUL49D, BUL742C, PHD13005,127, ST13005, BUJ103A,127) eliminates moisture sensitivity management requirements.

Q: Can substitute parts be used in existing PCB designs without modification?

A: All substitute parts utilize the TO-220-3 through-hole package, which maintains mechanical compatibility with existing PCB designs. Pin configuration and lead spacing are identical across the TO-220-3 family. Direct PCB substitution is supported without layout modification. Verify that thermal management provisions (heatsink contact area and mounting hardware) are adequate for the substitute part's power dissipation characteristics.

Q: Which substitute part offers the best supply chain availability?

A: BUL742C (STMicroelectronics) provides the highest inventory availability with 25200 units in stock, followed by BUL38D with 8725 units. Both parts maintain active product status and support long-term supply continuity. TSC742CZ C0G offers 1066 units with active status, providing an alternative source for direct electrical equivalents.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message