2SC3649S-TD-E Equivalent & Substitute Parts

Part Overview

The 2SC3649S-TD-E is an NPN bipolar junction transistor manufactured by onsemi, designed for surface mount applications in the TO-243AA package. This transistor operates at a maximum collector voltage of 160 V with a maximum collector current of 1.5 A and a maximum power dissipation of 500 mW. The device features a transition frequency of 120 MHz and is suitable for general-purpose switching and amplification circuits. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Alternative equivalent and substitute parts are available to accommodate different packaging requirements and current specifications while maintaining electrical compatibility within defined parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	160	V
Current - Collector (Ic) (Max)	1.5	A
Power - Max	500	mW
Frequency - Transition	120	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 100mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	450mV @ 50mA, 500mA	—
Operating Temperature (TJ)	150	°C
Package / Case	TO-243AA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 2SC3649S-TD-E is determined by electrical parameter compatibility and packaging format. The critical parameters that define substitution eligibility are: transistor type (NPN), maximum collector-emitter breakdown voltage (160 V), maximum power dissipation (500 mW), transition frequency (120 MHz), DC current gain minimum specification (100 @ 100mA, 5V), and package type (TO-243AA surface mount).

Substitute parts are grouped into two categories:

Parametric Equivalent: The 2SC3649T-TD-E maintains identical electrical specifications to the main part, including maximum collector current of 1.5 A and saturation voltage characteristics. The difference is limited to packaging format (Tape & Reel versus Cut Tape & Digi-Reel).

Similar Specification Substitutes: The 2SC3648S-TD-E and 2SC3648T-TD-E provide reduced maximum collector current (700 mA versus 1.5 A) and modified saturation voltage characteristics (400mV @ 25mA, 250mA versus 450mV @ 50mA, 500mA). These parts maintain identical voltage ratings, power dissipation, frequency response, and package specifications. The reduced current rating and altered saturation parameters define their application scope.

All substitute parts share the same TO-243AA package, surface mount mounting type, 160 V breakdown voltage, 500 mW power rating, 120 MHz transition frequency, and ROHS3 compliance status.

Parameter Comparison

Parameter	2SC3649S-TD-E (Main)	2SC3649T-TD-E	2SC3648S-TD-E	2SC3648T-TD-E
Transistor Type	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	160 V	160 V	160 V	160 V
Current - Collector (Ic) (Max)	1.5 A	1.5 A	700 mA	700 mA
Power - Max	500 mW	500 mW	500 mW	500 mW
Frequency - Transition	120 MHz	120 MHz	120 MHz	120 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 100mA, 5V	100 @ 100mA, 5V	100 @ 100mA, 5V	100 @ 100mA, 5V
Vce Saturation (Max) @ Ib, Ic	450mV @ 50mA, 500mA	450mV @ 50mA, 500mA	400mV @ 25mA, 250mA	400mV @ 25mA, 250mA
Operating Temperature (TJ)	150°C	150°C	150°C	150°C
Package / Case	TO-243AA	TO-243AA	TO-243AA	TO-243AA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

2SC3649T-TD-E: This part is a direct parametric equivalent to the 2SC3649S-TD-E. Selection of this substitute is appropriate when Tape & Reel packaging is required for both applications. Both parts maintain identical electrical specifications, including 1.5 A maximum collector current and 450 mV saturation voltage characteristics. Both parts are active production status with ROHS3 compliance and unlimited moisture sensitivity rating.

2SC3648S-TD-E and 2SC3648T-TD-E: These parts are suitable substitutes when maximum collector current requirements do not exceed 700 mA. The reduced current specification and modified saturation voltage characteristics (400 mV @ 25mA, 250mA) define the operational envelope for these devices. Selection between the S and T variants depends on packaging format requirements: Cut Tape & Digi-Reel for the 2SC3648S-TD-E or Tape & Reel for the 2SC3648T-TD-E. Both variants are active production status with ROHS3 compliance and unlimited moisture sensitivity rating.

All substitute parts maintain the same TO-243AA package footprint, surface mount compatibility, 160 V breakdown voltage rating, 500 mW power dissipation limit, 120 MHz transition frequency, and regulatory compliance status as the main part.

Frequently Asked Questions (FAQ)

Q: Can the 2SC3649T-TD-E be used as a direct replacement for the 2SC3649S-TD-E?

A: Yes. The 2SC3649T-TD-E is a parametric equivalent with identical electrical specifications. The only difference is the packaging format: the main part uses Tape & Reel (TR) packaging while the substitute uses Tape & Reel (TR) as well. Both parts are suitable for direct substitution in applications requiring 1.5 A maximum collector current.

Q: What are the limitations when substituting with 2SC3648S-TD-E or 2SC3648T-TD-E?

A: The 2SC3648 series has a maximum collector current rating of 700 mA, compared to 1.5 A for the 2SC3649 series. Additionally, the saturation voltage characteristics differ: 400 mV @ 25mA, 250mA for the 2SC3648 versus 450 mV @ 50mA, 500mA for the 2SC3649. These parts are suitable only for applications where collector current does not exceed 700 mA and where the modified saturation characteristics are acceptable.

Q: Are all substitute parts in the same package?

A: Yes. All parts listed—2SC3649S-TD-E, 2SC3649T-TD-E, 2SC3648S-TD-E, and 2SC3648T-TD-E—use the TO-243AA surface mount package. The physical footprint and mounting requirements are identical across all variants.

Q: What is the difference between Cut Tape & Digi-Reel and Tape & Reel packaging?

A: Both are tape-based packaging formats for surface mount components. Tape & Reel (TR) is the standard reel format for automated assembly. Cut Tape (CT) & Digi-Reel® provides the same components in cut tape format with optional Digi-Reel packaging. The electrical specifications and component performance are identical; the difference is in the supply format and handling method.

Q: Do all substitute parts have the same compliance certifications?

A: Yes. All parts—2SC3649S-TD-E, 2SC3649T-TD-E, 2SC3648S-TD-E, and 2SC3648T-TD-E—are ROHS3 compliant, REACH unaffected, and have unlimited moisture sensitivity rating (MSL 1). All parts are active production status from onsemi.

Q: Can I use a 2SC3648 part in a circuit designed for 2SC3649?

A: Substitution is possible only if the circuit design does not require collector current exceeding 700 mA and if the modified saturation voltage characteristics (400 mV @ 25mA, 250mA) are compatible with the circuit operation. The 2SC3648 series provides reduced current capability and different saturation behavior compared to the 2SC3649 series.

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