2SC3503DSTU Equivalent & Substitute Parts

Part Overview

The 2SC3503DSTU is an NPN bipolar junction transistor manufactured by onsemi, rated for 300 V collector-emitter breakdown voltage and 100 mA maximum collector current. This device is packaged in TO-126-3 through-hole configuration and is rated for 7 W maximum power dissipation with a transition frequency of 150 MHz. The 2SC3503DSTU carries an obsolete product status. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	300	V
Current - Collector (Ic) (Max)	100	mA
Power - Max	7	W
Frequency - Transition	150	MHz
Vce Saturation (Max) @ Ib, Ic	600 mV @ 2 mA, 20 mA	—
Current - Collector Cutoff (Max)	100	nA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-126-3	—

Substitute Part Grouping Explanation

Substitution of the 2SC3503DSTU is determined by electrical and mechanical parameter equivalence. The critical parameters governing substitution are:

Transistor type (NPN)
Voltage rating (300 V collector-emitter breakdown)
Current rating (100 mA maximum collector current)
Power dissipation (7 W)
Transition frequency (150 MHz)
Saturation voltage characteristics (600 mV @ 2 mA, 20 mA)
Collector cutoff current (100 nA maximum)
Operating temperature range (-55°C to 150°C)
Through-hole mounting configuration
TO-126-3 package compatibility

The substitute parts identified—KSC3503DS and KSC3503DSTU—meet all electrical specifications and mechanical requirements. These parts are manufactured by onsemi and maintain identical functional parameters with the main part. Differences exist only in product status (active versus obsolete), packaging format (bulk versus tube), and DC current gain minimum specification at specific operating points.

Parameter Comparison

Parameter	2SC3503DSTU	KSC3503DS	KSC3503DSTU
Manufacturer	onsemi	onsemi	onsemi
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	300 V	300 V	300 V
Current - Collector (Ic) (Max)	100 mA	100 mA	100 mA
Power - Max	7 W	7 W	7 W
Frequency - Transition	150 MHz	150 MHz	150 MHz
Vce Saturation (Max) @ Ib, Ic	600 mV @ 2 mA, 20 mA	600 mV @ 2 mA, 20 mA	600 mV @ 2 mA, 20 mA
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA
DC Current Gain (hFE) (Min) @ Ic, Vce	60 @ 10 mA, 10 V	60 @ 10 mA, 10 V	40 @ 10 mA, 10 V
Operating Temperature Range	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-126-3	TO-126-3	TO-126-3
Product Status	Obsolete	Active	Active
Packaging Format	Tube	Bulk	Tube
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Both KSC3503DS and KSC3503DSTU are direct functional equivalents to the 2SC3503DSTU. Selection between these substitutes is based on the following criteria:

KSC3503DS is recommended for applications requiring bulk packaging and maximum current gain specification. This part carries active product status and ROHS3 compliance certification, ensuring long-term availability and regulatory alignment with modern manufacturing standards.

KSC3503DSTU is recommended for applications where tube packaging is required for automated assembly processes. This part also carries active product status and ROHS3 compliance certification. The DC current gain minimum specification is 40 @ 10 mA, 10 V, which is lower than the 2SC3503DSTU specification of 60 @ 10 mA, 10 V. This difference must be evaluated against circuit design requirements.

Both substitute parts maintain identical electrical performance across all critical parameters including voltage rating, current rating, power dissipation, transition frequency, saturation voltage, and operating temperature range. Both parts are REACH unaffected and carry EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can KSC3503DS and KSC3503DSTU be used interchangeably with 2SC3503DSTU?

A: Yes. Both parts meet all electrical and mechanical specifications required for direct substitution. The primary difference is DC current gain minimum specification for KSC3503DSTU (40 @ 10 mA, 10 V versus 60 @ 10 mA, 10 V). Circuit designs must accommodate this specification variance.

Q: What is the significance of the product status difference?

A: The 2SC3503DSTU carries obsolete status, indicating onsemi has discontinued production and support. KSC3503DS and KSC3503DSTU carry active status, ensuring continued manufacturing, technical support, and long-term availability.

Q: Are there packaging considerations for substitution?

A: Yes. The 2SC3503DSTU is supplied in tube packaging. KSC3503DS is supplied in bulk packaging, while KSC3503DSTU is supplied in tube packaging. Bulk packaging is suitable for manual assembly and reel-based automated processes. Tube packaging is suitable for automated pick-and-place assembly systems. Select the packaging format appropriate for your manufacturing process.

Q: Do the substitute parts meet current regulatory requirements?

A: Yes. Both KSC3503DS and KSC3503DSTU carry ROHS3 compliance certification and REACH unaffected status. The 2SC3503DSTU does not specify RoHS status. Both substitutes meet current regulatory requirements for electronic component manufacturing and distribution.

Q: What is the impact of the DC current gain difference in KSC3503DSTU?

A: The KSC3503DSTU specifies a minimum DC current gain of 40 @ 10 mA, 10 V, compared to 60 @ 10 mA, 10 V for the 2SC3503DSTU. This represents a lower current gain specification. Circuit designs relying on specific current gain values must be evaluated to determine if this specification variance affects performance. KSC3503DS maintains the original 60 @ 10 mA, 10 V specification.

Q: Are all three parts manufactured by the same company?

A: Yes. All three parts—2SC3503DSTU, KSC3503DS, and KSC3503DSTU—are manufactured by onsemi. The KSC prefix indicates a onsemi commercial-grade designation, while the 2SC prefix indicates a standard industrial designation.

Q: What are the REACH and export classification implications?

A: All three parts carry REACH unaffected status and EAR99 export classification. These designations indicate the parts are not subject to REACH substance restrictions and are not controlled for export purposes under the Export Administration Regulations.

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