BCW66G_D87Z Equivalent & Substitute Parts

Part Overview

The BCW66G_D87Z is an NPN bipolar junction transistor manufactured by onsemi, rated for 45 V collector-emitter breakdown voltage and 1 A maximum collector current in a surface mount SOT-23-3 package. This device is classified as obsolete, indicating discontinuation from active production. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	45	V
Current - Collector (Ic) (Max)	1	A
Power - Max	350	mW
Frequency - Transition	100	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	160 @ 100mA, 1V	—
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	—
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3 (TO-236)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the BCW66G_D87Z is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (required match)
Voltage - Collector Emitter Breakdown (Max): 45 V or greater
Package / Case: SOT-23-3 (TO-236) surface mount (required match)
Mounting Type: Surface Mount (required match)
Operating Temperature Range: Must encompass or exceed -55°C to 150°C

Secondary Compatibility Parameters:

Current - Collector (Ic) (Max): 1 A or greater (for direct replacement without derating)
Power - Max: 350 mW or greater
Frequency - Transition: 100 MHz or greater
DC Current Gain (hFE): Minimum 160 @ 100mA, 1V or equivalent specification
Vce Saturation: 700mV @ 50mA, 500mA or lower

Substitute parts are grouped into three categories based on current rating capability: full-current substitutes (≥1 A), mid-range substitutes (500 mA to 800 mA), and lower-current substitutes (100 mA). Selection depends on circuit current requirements and thermal design constraints.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce(BR)	Power (Max)	fT	hFE (Min)	Vce Sat	Temp Range	Package	Status
BCW66G_D87Z	onsemi	1 A	45 V	350 mW	100 MHz	160 @ 100mA, 1V	700mV @ 50mA, 500mA	-55 to 150°C	SOT-23-3	Obsolete
BC817-16LT1G	onsemi	500 mA	45 V	300 mW	100 MHz	100 @ 100mA, 1V	700mV @ 50mA, 500mA	-65 to 150°C	SOT-23-3	Active
BC817-25LT3G	onsemi	500 mA	45 V	300 mW	100 MHz	160 @ 100mA, 1V	700mV @ 50mA, 500mA	-65 to 150°C	SOT-23-3	Active
BC847BLT3G	onsemi	100 mA	45 V	300 mW	100 MHz	200 @ 2mA, 5V	600mV @ 5mA, 100mA	-55 to 150°C	SOT-23-3	Active
BC847CLT1G	onsemi	100 mA	45 V	300 mW	100 MHz	420 @ 2mA, 5V	600mV @ 5mA, 100mA	-55 to 150°C	SOT-23-3	Active
BC847CLT3G	onsemi	100 mA	45 V	300 mW	100 MHz	420 @ 2mA, 5V	600mV @ 5mA, 100mA	-55 to 150°C	SOT-23-3	Active
BCW66GLT1G	onsemi	800 mA	45 V	300 mW	100 MHz	160 @ 100mA, 1V	700mV @ 50mA, 500mA	-55 to 150°C	SOT-23-3	Active
BCW66GLT3G	onsemi	800 mA	45 V	300 mW	100 MHz	160 @ 100mA, 1V	700mV @ 50mA, 500mA	-55 to 150°C	SOT-23-3	Active
BCX19LT1G	onsemi	500 mA	45 V	300 mW	—	100 @ 100mA, 1V	620mV @ 50mA, 500mA	-55 to 150°C	SOT-23-3	Active
CPH3216-TL-EX	onsemi	1 A	50 V	900 mW	420 MHz	200 @ 100mA, 2V	190mV @ 10mA, 500mA	—	3-CPH	Active
MMBT2222ALT1G	onsemi	600 mA	40 V	225 mW	300 MHz	100 @ 150mA, 10V	1V @ 50mA, 500mA	-55 to 150°C	SOT-23-3	Active

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

BCW66GLT1G and BCW66GLT3G are the primary recommended substitutes. Both devices maintain identical electrical characteristics to the BCW66G_D87Z, including 45 V breakdown voltage, 160 hFE minimum specification, and 700 mV saturation voltage. These parts differ only in current rating (800 mA versus 1 A) and power dissipation (300 mW versus 350 mW). Both are active products with ROHS3 compliance and unlimited moisture sensitivity rating. BCW66GLT1G offers higher inventory availability (380,300 units) compared to BCW66GLT3G (10,100 units).

Mid-Range Substitutes (Current-Limited Applications):

BC817-25LT3G provides electrical equivalence with identical hFE specification (160 @ 100mA, 1V) and saturation voltage characteristics. This device is rated for 500 mA maximum collector current and 300 mW power dissipation, suitable for applications where circuit current does not exceed 500 mA. BC817-25LT3G is an active product with ROHS3 compliance and extended temperature range (-65°C to 150°C). BC817-16LT1G offers similar current and power ratings with lower hFE specification (100 @ 100mA, 1V) and higher inventory availability (305,400 units).

Lower-Current Substitutes (Signal-Level Applications):

BC847CLT1G and BC847CLT3G are suitable for applications requiring maximum 100 mA collector current. These devices maintain 45 V breakdown voltage and 100 MHz transition frequency. BC847CLT1G provides 420 hFE minimum specification with 80,100 units in stock. BC847CLT3G offers identical electrical characteristics with 90,200 units available. Both are active products with ROHS3 compliance.

Alternative Package Consideration:

CPH3216-TL-EX is a 1 A rated device with 50 V breakdown voltage and superior performance characteristics (420 MHz transition frequency, 900 mW power dissipation). However, this device uses a 3-CPH package rather than SOT-23-3, requiring circuit board layout modification and is not recommended as a direct substitute without design review.

Compliance Status:

All recommended substitute parts are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance and long-term supply availability.

Frequently Asked Questions (FAQ)

Q: Can BC847CLT1G replace BCW66G_D87Z in all applications?

A: BC847CLT1G is electrically compatible for applications where collector current does not exceed 100 mA. The BCW66G_D87Z is rated for 1 A maximum collector current. If circuit design requires currents between 100 mA and 1 A, BC847CLT1G will not function correctly and may be damaged. For applications requiring full 1 A capability, use BCW66GLT1G or BCW66GLT3G.

Q: What is the difference between BCW66GLT1G and BCW66GLT3G?

A: Both devices are electrically identical with 800 mA maximum collector current, 45 V breakdown voltage, and 160 hFE minimum specification. The primary difference is packaging format: BCW66GLT1G is supplied in Cut Tape format, while BCW66GLT3G is supplied in Tape & Reel format. BCW66GLT1G has significantly higher inventory availability (380,300 units versus 10,100 units).

Q: Is the SOT-23-3 package identical across all substitute parts?

A: Yes. All recommended substitute parts use the SOT-23-3 (TO-236) surface mount package with identical pin configuration and footprint. No circuit board layout modification is required when substituting between these devices.

Q: Why is CPH3216-TL-EX not recommended as a direct substitute despite matching current rating?

A: CPH3216-TL-EX uses a 3-CPH package rather than SOT-23-3, requiring different circuit board footprint and assembly process. Additionally, operating temperature range is not specified for this device. While electrical performance exceeds the BCW66G_D87Z, package incompatibility prevents direct substitution without design modification.

Q: Can MMBT2222ALT1G be used as a substitute?

A: MMBT2222ALT1G is not recommended. Although it provides SOT-23-3 package compatibility and active product status with AEC-Q101 automotive qualification, it has a 40 V maximum breakdown voltage compared to the 45 V requirement of BCW66G_D87Z. Additionally, saturation voltage is higher (1 V versus 700 mV), and power dissipation is lower (225 mW versus 350 mW), indicating reduced current handling capability.

Q: What is the impact of lower hFE specification in BC817-16LT1G?

A: BC817-16LT1G specifies 100 hFE minimum at 100 mA and 1 V, compared to 160 for BCW66G_D87Z. Lower hFE requires higher base current to achieve saturation, increasing power dissipation in base drive circuits. For applications with tight base current budgets or requiring minimum base drive, BC817-25LT3G (160 hFE) is preferred over BC817-16LT1G.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts carry ROHS3 compliance certification. The BCW66G_D87Z does not specify RoHS status. All substitutes are REACH unaffected and carry EAR99 export classification.

Q: What is the significance of extended temperature range in BC817 series?

A: BC817-16LT1G and BC817-25LT3G specify -65°C to 150°C operating range compared to -55°C to 150°C for BCW66G_D87Z. Extended lower temperature limit provides additional margin for applications operating in cold environments. This does not affect substitution suitability for standard -55°C to 150°C applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message