2SB1218ASL Equivalent & Substitute Parts

Part Overview

The 2SB1218ASL is a PNP bipolar junction transistor manufactured by Panasonic Electronic Components, rated for 45 V collector-emitter breakdown voltage and 100 mA maximum collector current. This device is packaged in the SC-70/SOT-323 surface mount configuration and is designed for general-purpose switching and amplification applications requiring 150 mW power dissipation.

The 2SB1218ASL is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production, repair, and redesign applications. Substitute devices must maintain electrical compatibility across critical parameters including voltage ratings, current ratings, power dissipation, and package form factor.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	45	V
Current - Collector (Ic) (Max)	100	mA
Power - Max	150	mW
Frequency - Transition	80	MHz
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
Operating Temperature (Max)	150	°C

Substitute Part Grouping Explanation

Substitution of the 2SB1218ASL is determined by strict equivalence across the following electrical and mechanical parameters:

Mandatory Equivalence Criteria:

Transistor type: PNP
Voltage - Collector Emitter Breakdown (Max): 45 V minimum
Current - Collector (Ic) (Max): 100 mA minimum
Package / Case: SC-70 or SOT-323
Mounting Type: Surface Mount

Secondary Compatibility Parameters:

Power - Max: 150 mW or greater
Frequency - Transition: 80 MHz or greater
Operating Temperature: 150°C or greater

All substitute parts listed meet or exceed the mandatory equivalence criteria. Substitute parts are grouped into two categories: Direct Substitutes (functionally equivalent with identical electrical specifications) and Similar Substitutes (functionally equivalent with enhanced or equivalent electrical specifications).

Parameter Comparison

Parameter	2SB1218ASL	BC857BW-G	BC857CW-G	BC857BW,115	BC857CW,115	BC857W,115	BC860BW,115
Manufacturer	Panasonic	Comchip Technology	Comchip Technology	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	NXP USA Inc.
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP
Ic (Max)	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA
Vce Breakdown (Max)	45 V	45 V	45 V	45 V	45 V	45 V	45 V
Power - Max	150 mW	150 mW	150 mW	200 mW	200 mW	200 mW	200 mW
Frequency - Transition	80 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz
Package / Case	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature (Max)	150°C	150°C	150°C	150°C	150°C	150°C	150°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

Direct Substitutes (Comchip Technology):

BC857BW-G and BC857CW-G are direct substitutes manufactured by Comchip Technology. Both devices are active products with ROHS3 compliance and REACH unaffected status. These parts maintain the 45 V voltage rating and 100 mA current rating of the original 2SB1218ASL. The BC857CW-G variant provides higher DC current gain (420 @ 2mA, 5V) compared to BC857BW-G (220 @ 2.2mA, 5V), offering improved amplification characteristics for gain-sensitive applications. Both are supplied in Tape & Reel packaging with unlimited moisture sensitivity level (MSL 1).

Similar Substitutes (Nexperia USA Inc. / NXP USA Inc.):

BC857BW,115, BC857CW,115, BC857W,115, and BC860BW,115 are similar substitutes from Nexperia and NXP. These devices provide enhanced power dissipation (200 mW versus 150 mW) and maintain all critical electrical parameters. BC857CW,115 and BC857W,115 are available in high inventory quantities (77,847 and 19,185 units respectively) and carry automotive grade qualification (AEC-Q101). BC857W,115 provides the lowest DC current gain (125 @ 2mA, 5V), suitable for applications requiring lower gain characteristics. BC860BW,115 maintains the 220 @ 2mA, 5V gain specification and is supplied in bulk packaging.

All substitute parts are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance for new designs and production applications.

Frequently Asked Questions (FAQ)

Q: Can BC857BW-G and BC857CW-G be used interchangeably with 2SB1218ASL?

A: Yes. Both BC857BW-G and BC857CW-G meet all mandatory equivalence criteria: PNP transistor type, 45 V collector-emitter breakdown voltage, 100 mA maximum collector current, and SC-70/SOT-323 surface mount package. The primary difference is DC current gain specification, with BC857CW-G providing higher gain (420 @ 2mA, 5V) versus BC857BW-G (220 @ 2.2mA, 5V).

Q: What is the difference between Comchip Technology and Nexperia substitute parts?

A: Comchip Technology substitutes (BC857BW-G, BC857CW-G) maintain the original 150 mW power rating. Nexperia substitutes (BC857BW,115, BC857CW,115, BC857W,115, BC860BW,115) provide enhanced 200 mW power dissipation. All meet the 45 V voltage and 100 mA current requirements. Nexperia parts carry automotive grade qualification (AEC-Q101) and are available in higher inventory quantities.

Q: Are all substitute parts RoHS compliant?

A: Comchip Technology substitutes (BC857BW-G, BC857CW-G) and Nexperia substitutes (BC857BW,115, BC857CW,115, BC857W,115) are ROHS3 compliant. The original 2SB1218ASL is RoHS non-compliant. BC860BW,115 RoHS status is not specified in available documentation.

Q: What packaging options are available for substitute parts?

A: Comchip Technology substitutes are supplied in Tape & Reel (TR) packaging. Nexperia substitutes are supplied in Cut Tape (CT) & Digi-Reel® or bulk packaging. All maintain the SC-70/SOT-323 surface mount package form factor compatible with 2SB1218ASL PCB layouts.

Q: Which substitute part has the highest DC current gain?

A: BC857CW-G and BC857CW,115 both provide 420 @ 2mA, 5V DC current gain, the highest among all listed substitutes. BC857W,115 provides the lowest gain at 125 @ 2mA, 5V.

Q: Are substitute parts suitable for automotive applications?

A: BC857BW,115, BC857CW,115, BC857W,115, and BC860BW,115 carry automotive grade qualification and AEC-Q101 certification. Comchip Technology substitutes (BC857BW-G, BC857CW-G) do not specify automotive qualification.

Q: What is the operating temperature range for substitute parts?

A: Comchip Technology substitutes (BC857BW-G, BC857CW-G) operate from -65°C to 150°C. Nexperia substitutes specify maximum operating temperature of 150°C. The original 2SB1218ASL specifies maximum operating temperature of 150°C.

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