2SC6144 Equivalent & Substitute Parts

Part Overview

The 2SC6144 is an NPN bipolar junction transistor manufactured by onsemi, rated for 50 V collector-emitter breakdown voltage and 10 A maximum collector current. This device is packaged in TO-220ML configuration for through-hole mounting applications. The 2SC6144 is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain compatibility across critical electrical parameters including voltage rating, current capacity, and thermal characteristics while accommodating differences in packaging and performance specifications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	10	A
Power - Max	2	W
Frequency - Transition	330	MHz
Operating Temperature (Max)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the 2SC6144 is determined by the following critical parameters:

Mandatory Matching Criteria:

Transistor Type: NPN configuration
Current - Collector (Ic) (Max): 10 A minimum
Voltage - Collector Emitter Breakdown (Max): 50 V minimum
Mounting Type: Through Hole
Package / Case: TO-220-3 family

Acceptable Variation Parameters:

Frequency - Transition: May vary based on application requirements
Power - Max: May exceed specification
Vce Saturation: May vary within acceptable operating ranges
DC Current Gain (hFE): May vary with different test conditions

The substitute parts 2SC4024 and D44H8G meet the mandatory matching criteria for NPN configuration, 10 A collector current, and through-hole TO-220 family packaging. Both devices support the required voltage and current specifications, though with differing secondary characteristics in frequency response and power dissipation capability.

Parameter Comparison

Parameter	2SC6144 (Main)	2SC4024 (Substitute)	D44H8G (Substitute)
Manufacturer	onsemi	Sanken Electric USA Inc.	onsemi
Product Status	Obsolete	Active	Active
Transistor Type	NPN	NPN	NPN
Current - Collector (Ic) (Max)	10 A	10 A	10 A
Voltage - Collector Emitter Breakdown (Max)	50 V	50 V	60 V
Vce Saturation (Max)	360 mV @ 300 mA, 6 A	500 mV @ 100 mA, 5 A	1 V @ 400 mA, 8 A
Current - Collector Cutoff (Max)	10 µA	10 µA	10 µA
DC Current Gain (hFE) (Min)	200 @ 270 mA, 2 V	300 @ 1 A, 4 V	40 @ 4 A, 1 V
Power - Max	2 W	35 W	2 W
Frequency - Transition	330 MHz	24 MHz	50 MHz
Operating Temperature (Max)	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
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

2SC4024 (Sanken Electric USA Inc.): The 2SC4024 is an active product with ROHS3 compliance, providing direct voltage and current rating equivalence to the 2SC6144. This device offers superior power dissipation capability (35 W versus 2 W), accommodating applications requiring higher thermal performance. The 2SC4024 exhibits lower transition frequency (24 MHz) compared to the 2SC6144 (330 MHz), making it suitable for lower-frequency switching applications. The higher DC current gain (300 minimum) supports efficient base drive requirements in many circuit topologies.

D44H8G (onsemi): The D44H8G is an active product with ROHS3 compliance, manufactured by the same supplier as the 2SC6144. This device provides a 60 V voltage rating, exceeding the 2SC6144 specification and offering additional design margin in voltage-constrained applications. The D44H8G maintains equivalent power dissipation (2 W) and collector current (10 A) specifications. The transition frequency (50 MHz) falls between the 2SC6144 and 2SC4024, supporting mid-range frequency applications. The lower DC current gain (40 minimum) requires higher base drive current in circuit implementations.

Both substitute parts support through-hole TO-220 family mounting, ensuring mechanical compatibility with existing PCB layouts. Selection between substitutes depends on application-specific requirements for frequency response, power dissipation, and current gain characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 2SC4024 directly replace the 2SC6144 in all applications?

A: The 2SC4024 meets the mandatory electrical criteria (NPN type, 10 A collector current, 50 V voltage rating, TO-220 package). However, the reduced transition frequency (24 MHz versus 330 MHz) limits applicability to lower-frequency switching circuits. Applications requiring high-frequency operation must evaluate circuit performance with the lower bandwidth characteristic.

Q: What is the primary advantage of the D44H8G over the 2SC6144?

A: The D44H8G provides a higher voltage rating (60 V versus 50 V), offering additional design margin in applications approaching the 50 V specification limit. Both devices share equivalent power dissipation and collector current ratings, with the D44H8G suitable for circuits requiring enhanced voltage headroom.

Q: Are there packaging differences between the substitute parts and the 2SC6144?

A: All three devices use TO-220-3 family packaging for through-hole mounting. The 2SC6144 specifies TO-220ML packaging, while the 2SC4024 uses TO-220F and the D44H8G uses standard TO-220. These variants represent different manufacturing formats within the TO-220-3 family and are mechanically compatible with standard TO-220 PCB footprints.

Q: How do the DC current gain specifications affect circuit design?

A: The 2SC6144 specifies 200 minimum hFE, the 2SC4024 specifies 300 minimum hFE, and the D44H8G specifies 40 minimum hFE. Higher current gain reduces base drive requirements; lower current gain requires increased base current for equivalent collector current. Circuit designs must account for these differences in base resistor selection and drive capability.

Q: What compliance certifications apply to substitute parts?

A: The 2SC4024 and D44H8G both carry ROHS3 compliance certification. The 2SC6144 does not specify RoHS status. All three devices are classified as REACH Unaffected and carry EAR99 ECCN designation.

Q: Is the 2SC6144 still available for procurement?

A: The 2SC6144 is classified as obsolete. The 2SC4024 and D44H8G are both active products with current inventory availability, making them preferred choices for new designs and ongoing production requirements.

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