2SC4004 Equivalent & Substitute Parts

Part Overview

The 2SC4004 is an NPN bipolar junction transistor manufactured by Panasonic Electronic Components, rated for 800 V collector-emitter breakdown voltage and 1 A maximum collector current. This device is packaged in a TO-220F-A1 through-hole configuration and is designed for applications requiring high-voltage switching and amplification with a maximum power dissipation of 2 W.

The 2SC4004 is classified as an obsolete product. Locating equivalent substitute parts is necessary to support ongoing maintenance, repair, and redesign efforts for legacy equipment and systems utilizing this component.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	800	V
Current - Collector (Ic) (Max)	1	A
Power - Max	2	W
Frequency - Transition	4	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitute parts for the 2SC4004 are identified based on electrical and mechanical compatibility within the following criteria:

Electrical Compatibility Requirements:

Transistor Type: NPN (identical)
Voltage - Collector Emitter Breakdown (Max): 800 V (equal or greater)
Mounting Type: Through Hole (identical)
Package / Case: TO-220-3 family (compatible mechanical footprint)

Allowable Parameter Variations:

Current - Collector (Ic) (Max): Substitute parts may exceed the 1 A specification, provided the application circuit design accommodates higher current ratings
Power - Max: Substitute parts may exceed the 2 W specification
Frequency - Transition: Substitute parts may exceed the 4 MHz specification
Operating Temperature: Substitute parts must support 150°C or higher

The substitute parts listed below meet or exceed all critical electrical parameters while maintaining mechanical compatibility with the original TO-220-3 package family.

Parameter Comparison

Parameter	2SC4004 (Panasonic)	FJPF5027OTU (onsemi)	KSC5027OTU (onsemi)
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	800 V	800 V	800 V
Current - Collector (Ic) (Max)	1 A	3 A	3 A
Vce Saturation (Max) @ Ib, Ic	1.5 V @ 40 mA, 200 mA	2 V @ 300 mA, 1.5 A	2 V @ 300 mA, 1.5 A
Current - Collector Cutoff (Max)	50 µA (ICBO)	10 µA (ICBO)	10 µA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	3 @ 500 mA, 5 V	20 @ 200 mA, 5 V	20 @ 200 mA, 5 V
Power - Max	2 W	40 W	50 W
Frequency - Transition	4 MHz	15 MHz	15 MHz
Operating Temperature (TJ)	150°C	150°C	150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

FJPF5027OTU (onsemi) and KSC5027OTU (onsemi) are both active, production-status alternatives to the obsolete 2SC4004. Both substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and distribution.

The FJPF5027OTU and KSC5027OTU share identical electrical specifications and differ only in maximum power dissipation (40 W versus 50 W) and package designation (TO-220F-3 versus TO-220-3). Both devices are mechanically compatible with the original TO-220-3 footprint and support the same operating temperature range.

Selection between FJPF5027OTU and KSC5027OTU should be based on application-specific thermal management requirements and PCB layout constraints. Both parts exceed the electrical performance of the 2SC4004 across all critical parameters, including collector-emitter breakdown voltage, maximum collector current, and transition frequency.

Frequently Asked Questions (FAQ)

Q: Can the FJPF5027OTU or KSC5027OTU be used as direct replacements for the 2SC4004 in existing circuit designs?

A: Yes. Both substitute parts maintain the same collector-emitter breakdown voltage (800 V), NPN transistor type, and through-hole TO-220-3 package configuration. The substitute parts exceed the original specifications for maximum collector current (3 A versus 1 A), power dissipation, and transition frequency, making them electrically compatible for applications designed around the 2SC4004.

Q: What is the difference between the FJPF5027OTU and KSC5027OTU?

A: The FJPF5027OTU is rated for 40 W maximum power dissipation and uses the TO-220F-3 package designation. The KSC5027OTU is rated for 50 W maximum power dissipation and uses the TO-220-3 package designation. Both devices have identical electrical characteristics and are mechanically compatible with the original 2SC4004 footprint.

Q: Are the substitute parts available in the same packaging format as the 2SC4004?

A: The 2SC4004 is supplied in TO-220F-A1 packaging. The substitute parts are supplied in TO-220F-3 (FJPF5027OTU) and TO-220-3 (KSC5027OTU) packaging. All three package variants are mechanically compatible with standard TO-220-3 through-hole PCB layouts and mounting hardware.

Q: What compliance certifications apply to the substitute parts?

A: Both FJPF5027OTU and KSC5027OTU are ROHS3 compliant and REACH unaffected. These certifications confirm compliance with current environmental and hazardous substance restrictions applicable to electronic components in regulated markets.

Q: Why is the 2SC4004 classified as obsolete?

A: The 2SC4004 is no longer in active production by Panasonic Electronic Components. The FJPF5027OTU and KSC5027OTU represent current-generation alternatives from onsemi that provide equivalent or superior electrical performance for the same application class.

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