BCW68G Equivalent & Substitute Parts

Part Overview

The BCW68G is a PNP bipolar junction transistor manufactured by onsemi, designed for surface mount applications in the SOT-23-3 package. This device is rated for 45 V collector-emitter breakdown voltage with a maximum collector current of 800 mA and operates across a temperature range of -55°C to 150°C. The BCW68G is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with modified parameters within acceptable design tolerances.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Ic) Maximum	800	mA
Collector-Emitter Breakdown Voltage (Vceo)	45	V
Vce Saturation @ Ib, Ic	1.5 V @ 30 mA, 300 mA	—
Collector Cutoff Current (Icbo)	20	nA
DC Current Gain (hFE) @ Ic, Vce	160 @ 100 mA, 1 V	—
Power Dissipation Maximum	350	mW
Transition Frequency	100	MHz
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-23-3 (TO-236)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the BCW68G is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Direct Equivalence:

Transistor polarity (PNP)
Collector-emitter breakdown voltage (45 V minimum)
Package type (SOT-23-3)
Operating temperature range (-55°C to 150°C)
Transition frequency (100 MHz)

Parameters Allowing Functional Substitution:

Collector current rating (800 mA or higher)
Power dissipation (350 mW or higher)
DC current gain (hFE minimum 160 @ 100 mA, 1 V or equivalent specification)
Vce saturation characteristics

The BCW68GLT1G serves as the direct equivalent, sharing identical electrical specifications with active product status. The BC807 series (BC807-16LT1G, BC807-16LT3G, BC807-25LT1G, BC807-25LT3G, BC807-40LT1G, BC807-40LT3G) and BC857 series (BC857ALT1G, BC857BLT1G, BC857BLT3G) function as substitutes with reduced collector current ratings (500 mA or 100 mA respectively) but maintain voltage, frequency, and package compatibility. These substitutes are suitable for applications where the full 800 mA current capability is not required.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vceo (Max) V	Power (Max) mW	hFE @ 100mA, 1V	Frequency MHz	Package	Packaging Type
BCW68G	onsemi	Obsolete	800	45	350	160	100	SOT-23-3	—
BCW68GLT1G	onsemi	Active	800	45	225	120 @ 10mA, 1V	100	SOT-23-3	Cut Tape & Digi-Reel
BC807-16LT1G	onsemi	Active	500	45	300	100 @ 100mA, 1V	100	SOT-23-3	Cut Tape & Digi-Reel
BC807-16LT3G	onsemi	Active	500	45	300	100 @ 100mA, 1V	100	SOT-23-3	Tape & Reel
BC807-25LT1G	onsemi	Active	500	45	300	160 @ 100mA, 1V	100	SOT-23-3	Cut Tape & Digi-Reel
BC807-25LT3G	onsemi	Active	500	45	300	160 @ 100mA, 1V	100	SOT-23-3	Cut Tape & Digi-Reel
BC807-40LT1G	onsemi	Active	500	45	300	250 @ 100mA, 1V	100	SOT-23-3	Cut Tape & Digi-Reel
BC807-40LT3G	onsemi	Active	500	45	300	250 @ 100mA, 1V	100	SOT-23-3	Cut Tape & Digi-Reel
BC857ALT1G	onsemi	Active	100	45	300	125 @ 2mA, 5V	100	SOT-23-3	Tape & Reel
BC857BLT1G	onsemi	Active	100	45	300	220 @ 2mA, 5V	100	SOT-23-3	Cut Tape & Digi-Reel
BC857BLT3G	onsemi	Active	100	45	300	220 @ 2mA, 5V	100	SOT-23-3	Tape & Reel

Engineering Selection Recommendations

Direct Equivalent Selection:

The BCW68GLT1G is the recommended direct replacement for the obsolete BCW68G. This part maintains identical collector current (800 mA), collector-emitter breakdown voltage (45 V), transition frequency (100 MHz), and package configuration (SOT-23-3). The BCW68GLT1G carries active product status and is RoHS3 compliant, ensuring long-term availability and regulatory compliance for new designs. The primary difference is reduced maximum power dissipation (225 mW versus 350 mW), which is acceptable for most applications operating within the 800 mA current specification.

Substitute Selection for Reduced Current Applications:

When application requirements permit collector current reduction to 500 mA, the BC807 series provides active alternatives with maintained voltage and frequency specifications. Selection within the BC807 series depends on DC current gain requirements and packaging preference:

BC807-16LT1G or BC807-16LT3G: Minimum hFE of 100 @ 100 mA, 1 V
BC807-25LT1G or BC807-25LT3G: Minimum hFE of 160 @ 100 mA, 1 V (matches BCW68G specification)
BC807-40LT1G or BC807-40LT3G: Minimum hFE of 250 @ 100 mA, 1 V

Substitute Selection for Low Current Applications:

When application requirements permit collector current reduction to 100 mA, the BC857 series provides active alternatives:

BC857ALT1G: Minimum hFE of 125 @ 2 mA, 5 V (Tape & Reel packaging)
BC857BLT1G: Minimum hFE of 220 @ 2 mA, 5 V (Cut Tape & Digi-Reel packaging)
BC857BLT3G: Minimum hFE of 220 @ 2 mA, 5 V (Tape & Reel packaging)

Packaging Considerations:

All listed parts are available in SOT-23-3 surface mount packages. Packaging format selection (Cut Tape & Digi-Reel versus Tape & Reel) depends on production volume and assembly requirements. All parts maintain identical pinout and footprint compatibility.

Compliance Status:

All active substitute parts carry RoHS3 compliance certification and REACH unaffected status, meeting current regulatory requirements for electronic component procurement.

Frequently Asked Questions (FAQ)

Q: Can BCW68GLT1G directly replace BCW68G in all applications?

A: BCW68GLT1G is the direct equivalent for BCW68G with identical electrical specifications for collector current (800 mA), voltage (45 V), and frequency (100 MHz). The reduced power dissipation rating (225 mW versus 350 mW) does not affect functionality in standard applications. Verify that your circuit design does not require the full 350 mW dissipation capability before substitution.

Q: What is the difference between BC807-25LT1G and BC807-25LT3G?

A: Both parts are electrically identical with 500 mA collector current and 160 @ 100 mA, 1 V DC current gain. The difference is packaging format: BC807-25LT1G is supplied in Cut Tape & Digi-Reel format, while BC807-25LT3G is supplied in Tape & Reel format. Select based on your assembly equipment and production volume requirements.

Q: Can I use BC857BLT1G as a substitute for BCW68G?

A: BC857BLT1G is a functional substitute only for applications where collector current does not exceed 100 mA. The part maintains the 45 V voltage rating, 100 MHz frequency, and SOT-23-3 package compatibility. If your application requires currents between 100 mA and 800 mA, use BC807 series parts instead.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed (BCW68GLT1G, BC807 series, and BC857 series) are RoHS3 compliant. The obsolete BCW68G does not carry RoHS certification. Compliance status is critical for new product designs and procurement in regulated markets.

Q: What determines whether I should use BC807 or BC857 series?

A: Selection is determined by maximum collector current requirement. BC807 series supports up to 500 mA, while BC857 series supports up to 100 mA. If your application requires 500 mA to 800 mA, use BCW68GLT1G or BC807 series. If your application requires only up to 100 mA, BC857 series is acceptable.

Q: Do all parts share the same pinout?

A: All listed parts use the SOT-23-3 package with identical pinout configuration. Direct footprint compatibility is maintained across all substitutes, allowing straightforward PCB layout reuse.

Q: What is the significance of the hFE specification differences?

A: DC current gain (hFE) determines the base current required to achieve a specified collector current. Higher hFE values require less base drive. BCW68G specifies 160 @ 100 mA, 1 V. BC807-25 series matches this specification, while BC807-16 series provides lower gain (100) and BC807-40 series provides higher gain (250). Select based on your circuit's base drive capability and design requirements.

Q: Can I mix different BC807 variants in the same design?

A: All BC807 variants maintain identical collector current (500 mA), voltage (45 V), frequency (100 MHz), and package specifications. Differences in hFE and packaging format do not prevent mixing within a single design, provided your circuit accommodates the hFE variation or you select a single variant for consistency.

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