2STC5948 Equivalent & Substitute Parts

Part Overview

The 2STC5948 is an NPN bipolar junction transistor manufactured by STMicroelectronics, rated for 250 V collector-emitter breakdown voltage and 17 A maximum collector current. This device is designed for high-power switching and amplification applications in the TO-3P package configuration. The 2STC5948 is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, and thermal characteristics.

Key Parameters

Parameter	2STC5948
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	250 V
Current - Collector (Ic) (Max)	17 A
Power - Max	200 W
Frequency - Transition	25 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	80 @ 1A, 5V
Vce Saturation (Max) @ Ib, Ic	3V @ 800mA, 8A
Current - Collector Cutoff (Max)	5µA (ICBO)
Operating Temperature (TJ)	150°C
Package / Case	TO-3P-3, SC-65-3
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 2STC5948 is determined by strict equivalence across the following critical electrical and mechanical parameters:

Primary Equivalence Criteria:

Transistor type: NPN configuration
Voltage rating: 250 V collector-emitter breakdown voltage (maximum)
Current capacity: Minimum 17 A collector current (maximum)
Package type: TO-3P through-hole configuration
Saturation characteristics: Vce saturation and base-collector current parameters
Thermal rating: Operating temperature range compatibility

Substitution Classification:

Direct Equivalent: Parts that match all primary criteria with identical or superior electrical performance and active product status.

Similar Equivalent: Parts that maintain voltage and package compatibility but with minor deviations in current capacity or power dissipation that remain within acceptable application ranges for the TO-3P class.

Parameter Comparison

Parameter	2STC5948	2SC5242OTU	NJW0281G
Manufacturer	STMicroelectronics	onsemi	onsemi
Product Status	Obsolete	Active	Active
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	250 V	250 V	250 V
Current - Collector (Ic) (Max)	17 A	17 A	15 A
Power - Max	200 W	130 W	150 W
Frequency - Transition	25 MHz	30 MHz	30 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	80 @ 1A, 5V	80 @ 1A, 5V	75 @ 3A, 5V
Vce Saturation (Max) @ Ib, Ic	3V @ 800mA, 8A	3V @ 800mA, 8A	1V @ 500mA, 5A
Current - Collector Cutoff (Max)	5µA (ICBO)	5µA (ICBO)	10µA (ICBO)
Operating Temperature (TJ)	150°C	-55°C ~ 150°C	-65°C ~ 150°C
Package / Case	TO-3P-3, SC-65-3	TO-3P-3, SC-65-3	TO-3P-3, SC-65-3
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

2SC5242OTU (onsemi): This part is classified as a direct equivalent to the 2STC5948. It maintains identical voltage rating (250 V), current capacity (17 A), and saturation characteristics. The 2SC5242OTU is active in production status, ensuring long-term availability and supply chain continuity. Transition frequency is improved to 30 MHz. Power dissipation is rated at 130 W compared to the original 200 W specification. This part is suitable for applications where the 2STC5948 was previously specified, provided that thermal design accommodates the reduced power rating. ROHS3 compliance and REACH unaffected status confirm regulatory alignment.

NJW0281G (onsemi): This part is classified as a similar equivalent. It maintains the 250 V voltage rating and TO-3P package configuration but with reduced maximum collector current (15 A versus 17 A) and modified saturation characteristics. Power dissipation is rated at 150 W. The NJW0281G is active in production status with extended operating temperature range (-65°C to 150°C). This part is suitable for applications where collector current requirements do not exceed 15 A and where the improved low-temperature performance is beneficial. ROHS3 compliance and REACH unaffected status confirm regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can the 2SC5242OTU directly replace the 2STC5948 in all applications?

A: The 2SC5242OTU maintains identical voltage rating, current capacity, and saturation characteristics as the 2STC5948. However, the maximum power dissipation is reduced from 200 W to 130 W. Applications operating at the upper thermal limits of the original specification require thermal design review to confirm compatibility with the reduced power rating.

Q: What is the primary difference between the 2SC5242OTU and NJW0281G?

A: The 2SC5242OTU matches the 2STC5948 in maximum collector current (17 A), while the NJW0281G is rated for 15 A maximum collector current. The 2SC5242OTU has identical saturation characteristics (3V @ 800mA, 8A), while the NJW0281G has improved saturation performance (1V @ 500mA, 5A). Power dissipation differs: 2SC5242OTU at 130 W, NJW0281G at 150 W.

Q: Are both substitute parts available in the same package as the 2STC5948?

A: Yes. Both the 2SC5242OTU and NJW0281G are supplied in TO-3P package configuration with through-hole mounting, matching the mechanical requirements of the 2STC5948. The supplier device package designation differs slightly (2SC5242OTU uses TO-3P; NJW0281G uses TO-3P-3L), but both are compatible with standard TO-3P footprints.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both the 2SC5242OTU and NJW0281G are ROHS3 compliant and REACH unaffected, matching the regulatory status of the 2STC5948.

Q: Which substitute part should be selected for new designs?

A: The 2SC5242OTU is recommended for new designs requiring direct electrical equivalence to the 2STC5948 specification. The NJW0281G is suitable for applications where collector current does not exceed 15 A and where improved saturation characteristics or extended low-temperature operation provide design benefits.

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

A: The 2SC5242OTU has 4254 pieces in stock. The NJW0281G has 20794 pieces in stock. Both parts are active in production status, ensuring ongoing availability.

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