2SC4915-Y,LF RF Transistor NPN Equivalent & Substitute Parts

Part Overview

The 2SC4915-Y,LF is an RF transistor manufactured by Toshiba Semiconductor and Storage, classified as an NPN bipolar junction transistor (BJT) designed for RF applications. This surface mount device operates at 550MHz transition frequency with a maximum collector-emitter breakdown voltage of 30V and maximum power dissipation of 100mW. The part is currently in active product status and RoHS compliant.

Substitute parts become necessary when the primary part experiences supply constraints, inventory limitations, or when design requirements permit operation within alternative electrical and mechanical specifications. The following equivalent and substitute parts are qualified based on matching or exceeding the core electrical parameters and mechanical compatibility of the 2SC4915-Y,LF.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	30	V
Frequency - Transition	550	MHz
Noise Figure (Typ @ f)	2.3dB ~ 5dB @ 100MHz	dB
Gain	17dB ~ 23dB	dB
Power - Max	100	mW
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 1mA, 6V	—
Current - Collector (Ic) (Max)	20	mA
Operating Temperature (TJ)	125	°C
Mounting Type	Surface Mount	—
Package / Case	SC-75, SOT-416	—
RoHS Status	RoHS Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 2SC4915-Y,LF is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): ≥ 30V
Frequency - Transition: ≥ 550MHz
Power - Max: ≥ 100mW
Current - Collector (Ic) (Max): ≥ 20mA
Mounting Type: Surface Mount
Package compatibility: SC-75, SOT-416 or equivalent surface mount packages

Secondary Compatibility Factors:

DC Current Gain (hFE): Minimum 70 @ specified conditions
Operating Temperature: ≥ 125°C
RoHS Compliance: ROHS3 or RoHS Compliant
Moisture Sensitivity Level: MSL 1

Substitute parts are grouped into two categories:

Category 1: Direct Toshiba Equivalents Parts sharing the same base product number (2SC4915) with identical electrical specifications but different packaging formats (Cut Tape vs. Tape & Reel).

Category 2: Cross-Manufacturer Substitutes Parts from Infineon Technologies and Central Semiconductor Corp that meet or exceed the electrical performance envelope while maintaining surface mount or compatible through-hole packaging. These parts operate at higher frequency bands or with enhanced power handling, making them suitable for applications where the 2SC4915-Y,LF specifications are met or exceeded.

Parameter Comparison

Part Number	Manufacturer	Vce (Max) [V]	Frequency [MHz]	Power (Max) [mW]	Ic (Max) [mA]	hFE (Min)	Package	Mounting Type	RoHS Status
2SC4915-Y,LF	Toshiba	30	550	100	20	100	SC-75, SOT-416	Surface Mount	RoHS Compliant
2SC4915-O,LF	Toshiba	30	550	100	20	70	SC-75, SOT-416	Surface Mount	ROHS3 Compliant
2N918 PBFREE	Central Semiconductor Corp	15	600	200	50	20	TO-206AF, TO-72-4	Through Hole	ROHS3 Compliant
2SC5347AE-TD-E	onsemi	12	4700	1300	150	90	TO-243AA	Surface Mount	ROHS3 Compliant
BF888H6327XTSA1	Infineon Technologies	4	47000	160	30	250	SC-82A, SOT-343	Surface Mount	ROHS3 Compliant
BFP181E7764HTSA1	Infineon Technologies	12	8000	175	20	70	TO-253-4, TO-253AA	Surface Mount	ROHS3 Compliant
BFP405H6327XTSA1	Infineon Technologies	5	25000	75	25	60	SC-82A, SOT-343	Surface Mount	ROHS3 Compliant
BFP405H6740XTSA1	Infineon Technologies	5	25000	75	25	60	SC-82A, SOT-343	Surface Mount	ROHS3 Compliant
BFP640FESDH6327XTSA1	Infineon Technologies	4.7	46000	200	50	110	4-SMD, Flat Leads	Surface Mount	ROHS3 Compliant
BFR193L3E6327XTMA1	Infineon Technologies	12	8000	580	80	70	SC-101, SOT-883	Surface Mount	ROHS3 Compliant
BFR460L3E6327XTMA1	Infineon Technologies	5.8	22000	200	50	90	SC-101, SOT-883	Surface Mount	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Recommended for Pin-Compatible Replacement):

The 2SC4915-O,LF is the direct equivalent of the 2SC4915-Y,LF. Both parts share identical electrical specifications, package dimensions (SC-75, SOT-416), and mounting type (Surface Mount). The primary difference is packaging format: 2SC4915-Y,LF is supplied in Cut Tape (CT) while 2SC4915-O,LF is supplied in Tape & Reel (TR). Both parts are RoHS compliant and carry MSL 1 rating. The 2SC4915-O,LF exhibits higher inventory availability (4139 Pcs vs. 816 Pcs) and carries ROHS3 compliance certification.

Cross-Manufacturer Substitutes for Enhanced Performance Applications:

When application requirements permit operation at higher frequency bands or with increased power handling capacity, the following substitutes are qualified:

BFP405H6327XTSA1 and BFP405H6740XTSA1 (Infineon): Operate at 25GHz transition frequency with 75mW power rating. Suitable for applications requiring higher frequency performance within reduced voltage envelope (5V Vce Max). Surface mount SC-82A, SOT-343 package.
BFR193L3E6327XTMA1 (Infineon): Operates at 8GHz with 580mW power rating and 80mA maximum collector current. Suitable for higher power RF applications. Surface mount SC-101, SOT-883 package.
BFP640FESDH6327XTSA1 (Infineon): Operates at 46GHz with 200mW power rating. Suitable for ultra-high frequency applications. 4-TSFP surface mount package.

Through-Hole Alternative:

The 2N918 PBFREE (Central Semiconductor Corp) is a through-hole mounted alternative with 600MHz transition frequency and 200mW power rating. This part is suitable only for applications where through-hole mounting is required and PCB layout permits the larger TO-72 package footprint.

Obsolete Part Consideration:

The 2SC5347AE-TD-E (onsemi) is marked as Obsolete product status and should not be selected for new designs despite superior electrical specifications (4.7GHz, 1.3W power).

Frequently Asked Questions (FAQ)

Q: Can the 2SC4915-O,LF directly replace the 2SC4915-Y,LF in existing designs?

A: Yes. The 2SC4915-O,LF is electrically and mechanically identical to the 2SC4915-Y,LF. The only difference is packaging format (Tape & Reel vs. Cut Tape). Both parts use the same SC-75, SOT-416 package and surface mount process. No circuit modifications are required.

Q: What is the primary difference between the 2SC4915-Y,LF and 2SC4915-O,LF?

A: The primary difference is DC Current Gain (hFE) specification: 2SC4915-Y,LF specifies minimum 100 @ 1mA, 6V while 2SC4915-O,LF specifies minimum 70 @ 1mA, 6V. Additionally, 2SC4915-O,LF carries ROHS3 compliance versus RoHS Compliant for the -Y variant. Both parts operate identically at 30V Vce Max, 550MHz, and 100mW power rating.

Q: Can I use BFP405H6327XTSA1 as a substitute for the 2SC4915-Y,LF?

A: BFP405H6327XTSA1 is not a direct substitute. While both are NPN RF transistors in surface mount packages, the BFP405H operates at 25GHz (vs. 550MHz) with reduced voltage rating (5V Vce Max vs. 30V). Use BFP405H only if your application operates at higher frequencies and lower voltages than the 2SC4915-Y,LF specification.

Q: Is the 2N918 PBFREE suitable for my application using 2SC4915-Y,LF?

A: The 2N918 PBFREE is suitable only if your PCB design accommodates through-hole mounting (TO-72 package). The 2SC4915-Y,LF is surface mount (SC-75, SOT-416). The 2N918 offers higher power (200mW vs. 100mW) and higher collector current (50mA vs. 20mA) but lower voltage rating (15V vs. 30V). Verify your circuit voltage and frequency requirements before substitution.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 (Unlimited) indicates the component has no moisture sensitivity limitations. The part does not require special moisture-controlled storage or handling procedures. Both the 2SC4915-Y,LF and all listed substitute parts carry MSL 1 rating.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 2SC4915-Y,LF is RoHS Compliant. All listed substitute parts carry either RoHS Compliant or ROHS3 Compliant certification, confirming compliance with Restriction of Hazardous Substances regulations.

Q: Can I use BFR193L3E6327XTMA1 in place of 2SC4915-Y,LF?

A: BFR193L3E6327XTMA1 is not a direct substitute. It operates at 8GHz (vs. 550MHz) with lower voltage rating (12V vs. 30V) but significantly higher power handling (580mW vs. 100mW) and collector current (80mA vs. 20mA). The package is also different (SC-101, SOT-883 vs. SC-75, SOT-416). Use only if your application requires higher frequency and power performance.

Q: What is the inventory status of substitute parts?

A: Inventory availability varies: 2SC4915-O,LF (4139 Pcs), BFP181E7764HTSA1 (90300 Pcs), BFP405H6327XTSA1 (40333 Pcs), BFR460L3E6327XTMA1 (15872 Pcs), BFP640FESDH6327XTSA1 (3652 Pcs), BFR193L3E6327XTMA1 (882 Pcs), 2N918 PBFREE (1800 Pcs), BF888H6327XTSA1 (903 Pcs), BFP405H6740XTSA1 (914 Pcs). Verify current availability with your supplier before design commitment.

Q: Why is 2SC5347AE-TD-E listed if it is obsolete?

A: The 2SC5347AE-TD-E is included for reference only as a historical substitute option. Its Obsolete product status disqualifies it from selection in new designs. Use only for legacy system maintenance where no alternative exists.

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