2SC4617G Equivalent & Substitute Parts

Part Overview

The 2SC4617G is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a 50 V collector-emitter breakdown voltage, 100 mA maximum collector current, and 180 MHz transition frequency in a surface mount SC-75 (SOT-416) package. The 2SC4617G is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility within the specified parameter ranges while accommodating packaging and availability constraints.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	100	mA
Frequency - Transition	180	MHz
Power - Max	125	mW
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 1mA, 6V	—
Vce Saturation (Max) @ Ib, Ic	400mV @ 5mA, 60mA	—
Current - Collector Cutoff (Max)	500	nA
Operating Temperature (Max)	150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-75, SOT-416	—

Substitute Part Grouping Explanation

Substitute parts for the 2SC4617G are classified into three categories based on electrical and mechanical compatibility:

Parametric Equivalent: Parts that match all critical electrical specifications (Vce breakdown, Ic max, transition frequency, power dissipation, and DC current gain) while maintaining the same package footprint. These parts are direct functional replacements.

Direct Manufacturer Substitute: Parts that meet the core electrical requirements (Vce breakdown, Ic max, DC current gain) but may differ in secondary parameters such as transition frequency, power dissipation, or saturation voltage. These parts are suitable when the application does not require exact frequency or power matching.

Similar Substitute: Parts that maintain the same transistor type (NPN), voltage class, and current rating but may employ different package types or have enhanced specifications. These parts require board-level design verification due to package differences.

The following parameters determine substitution eligibility:

Transistor Type (must be NPN)
Voltage - Collector Emitter Breakdown (must be ≥50 V)
Current - Collector (Ic) (must be ≥100 mA)
DC Current Gain (hFE) (must be ≥120 @ specified conditions)
Operating Temperature (must support ≥150°C)

Parameter Comparison

Parameter	2SC4617G	S2SC4617G	BC847BTT1G	2SC4617-R-TP	2SC4617TLQ	2PC4617QM,315
Manufacturer	onsemi	onsemi	onsemi	Micro Commercial Co	Rohm Semiconductor	Nexperia USA Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	50 V	50 V	45 V	50 V	50 V	50 V
Current - Collector (Ic) (Max)	100 mA	100 mA	100 mA	150 mA	150 mA	100 mA
Frequency - Transition	180 MHz	180 MHz	100 MHz	180 MHz	180 MHz	100 MHz
Power - Max	125 mW	125 mW	225 mW	150 mW	150 mW	430 mW
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 1mA, 6V	120 @ 1mA, 6V	200 @ 2mA, 5V	120 @ 1mA, 6V	120 @ 1mA, 6V	120 @ 1mA, 6V
Vce Saturation (Max) @ Ib, Ic	400mV @ 5mA, 60mA	400mV @ 5mA, 60mA	600mV @ 5mA, 100mA	400mV @ 5mA, 50mA	400mV @ 5mA, 50mA	200mV @ 5mA, 50mA
Current - Collector Cutoff (Max)	500 nA	500 nA	15 nA	500 nA	100 nA	100 nA
Operating Temperature (Max)	150°C	150°C	150°C	150°C	150°C	150°C
Package / Case	SC-75, SOT-416	SC-75, SOT-416	SC-75, SOT-416	SOT-523	SC-75, SOT-416	SC-101, SOT-883
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

S2SC4617G (Parametric Equivalent - Recommended Primary Substitute)

The S2SC4617G is the optimal substitute for the obsolete 2SC4617G. This part is manufactured by onsemi and maintains identical electrical specifications across all critical parameters: 50 V breakdown voltage, 100 mA collector current, 180 MHz transition frequency, 125 mW power dissipation, and 120 hFE minimum gain. The S2SC4617G is supplied in Tape & Reel packaging and holds active product status with ROHS3 compliance. The identical SC-75 (SOT-416) package footprint ensures direct board-level compatibility without design modification. Inventory availability is substantial at 9,200 pieces.

2SC4617TLQ (Parametric Equivalent - Secondary Substitute)

The 2SC4617TLQ, manufactured by Rohm Semiconductor, provides parametric equivalence with enhanced current capability (150 mA maximum) and identical frequency response (180 MHz). This part maintains the 50 V breakdown voltage, 120 hFE minimum gain, and 400 mV saturation voltage. The package footprint is SC-75 (SOT-416), matching the original design. The 2SC4617TLQ is supplied in Cut Tape & Digi-Reel packaging with ROHS3 compliance and active product status. High inventory availability (474,300 pieces) supports production continuity.

2SC4617-R-TP (Similar Substitute - Package Variant)

The 2SC4617-R-TP, manufactured by Micro Commercial Co, offers enhanced current capability (150 mA maximum) and maintains the 180 MHz transition frequency and 50 V breakdown voltage. This part differs in package type (SOT-523 versus SC-75/SOT-416), requiring board-level design verification and PCB layout modification. The operating temperature range extends to −55°C, providing broader environmental coverage. This substitute is suitable for applications where package size reduction is beneficial and board redesign is acceptable.

BC847BTT1G (Direct Manufacturer Substitute - Voltage Derating)

The BC847BTT1G, manufactured by onsemi, operates at 45 V breakdown voltage, representing a 5 V reduction from the 2SC4617G specification. This part maintains 100 mA collector current and SC-75 (SOT-416) package compatibility. The transition frequency is reduced to 100 MHz, and power dissipation is increased to 225 mW. The BC847BTT1G is suitable for applications where the 45 V voltage rating is sufficient and lower frequency operation is acceptable. This part is supplied in Cut Tape & Digi-Reel packaging with active product status and ROHS3 compliance. Extensive inventory availability (305,700 pieces) supports high-volume production.

2PC4617QM,315 (Similar Substitute - Automotive Grade)

The 2PC4617QM,315, manufactured by Nexperia USA Inc., is qualified to AEC-Q100 automotive standards and features enhanced power dissipation (430 mW). This part maintains 50 V breakdown voltage and 100 mA collector current with improved saturation characteristics (200 mV). The package type is SOT-883 (SC-101), differing from the original SC-75 footprint and requiring board redesign. The 100 MHz transition frequency is reduced from the original 180 MHz specification. This substitute is appropriate for automotive applications requiring AEC-Q100 qualification and where package size optimization is a design objective.

Frequently Asked Questions (FAQ)

Q: Can the S2SC4617G be used as a direct replacement for the 2SC4617G without circuit modification?

A: Yes. The S2SC4617G maintains identical electrical specifications and the same SC-75 (SOT-416) package footprint. No circuit or board-level modifications are required for direct substitution.

Q: What is the primary difference between the 2SC4617TLQ and the original 2SC4617G?

A: The 2SC4617TLQ supports higher maximum collector current (150 mA versus 100 mA) while maintaining all other critical specifications including 50 V breakdown voltage, 180 MHz transition frequency, and 120 hFE minimum gain. The package footprint remains identical (SC-75/SOT-416).

Q: Why does the BC847BTT1G have a lower breakdown voltage (45 V) than the 2SC4617G (50 V)?

A: The BC847BTT1G is a different device family with different electrical characteristics. While it maintains the same package and current rating, the 45 V rating represents a design trade-off. This part is suitable only for applications where 45 V breakdown voltage is sufficient.

Q: Can the 2SC4617-R-TP be used without PCB redesign?

A: No. The 2SC4617-R-TP uses a SOT-523 package, which differs from the original SC-75 (SOT-416) package. PCB layout and footprint modification is required for this substitution.

Q: Is the 2PC4617QM,315 suitable for non-automotive applications?

A: Yes. The 2PC4617QM,315 meets all electrical requirements for general-purpose applications. The AEC-Q100 automotive qualification is an additional certification that does not restrict use in non-automotive designs. However, the SOT-883 package requires board redesign.

Q: What is the significance of ROHS3 compliance on substitute parts?

A: ROHS3 compliance indicates that the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. This compliance is required for products sold in the European Union and is increasingly required globally. All active substitute parts listed carry ROHS3 compliance.

Q: How does transition frequency affect circuit performance?

A: Transition frequency (fT) determines the maximum frequency at which the transistor can amplify signals. The 2SC4617G and its parametric equivalents (S2SC4617G, 2SC4617TLQ) operate at 180 MHz. Substitutes with lower transition frequency (BC847BTT1G, 2PC4617QM,315 at 100 MHz) are suitable for applications operating below 100 MHz but may not perform adequately in higher-frequency circuits.

Q: What packaging options are available for 2SC4617G substitutes?

A: The primary substitute parts are available in three package types: SC-75 (SOT-416) for S2SC4617G, 2SC4617TLQ, and BC847BTT1G; SOT-523 for 2SC4617-R-TP; and SOT-883 (SC-101) for 2PC4617QM,315. Package selection depends on board space constraints and design requirements.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. Inventory availability varies significantly among substitutes. S2SC4617G (9,200 pieces), 2SC4617TLQ (474,300 pieces), and BC847BTT1G (305,700 pieces) have substantial inventory. 2SC4617-R-TP has limited inventory (717 pieces). Inventory levels should be evaluated for production volume and supply chain continuity requirements.

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