BCW66G-TP Equivalent & Substitute Parts

Part Overview

The BCW66G-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for interface applications in surface mount configurations. This device operates at a maximum collector current of 800 mA with a collector-emitter breakdown voltage of 45 V and a transition frequency of 100 MHz. The part is currently active in production with 764 units in stock.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter ranges. Alternative devices may be required due to supply chain considerations, packaging format availability, or specific application requirements within the defined electrical envelope.

Key Parameters

Parameter	BCW66G-TP Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	800	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max) @ Ib, Ic	700 mV @ 50 mA, 500 mA	—
Current - Collector Cutoff (Max)	20	nA
DC Current Gain (hFE) Min @ Ic, Vce	160 @ 100 mA, 1 V	—
Power - Max	200	mW
Frequency - Transition	100	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—

Substitute Part Grouping Explanation

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

Primary Substitution Criteria:

Transistor Type: NPN configuration required
Voltage - Collector Emitter Breakdown: minimum 45 V
Frequency - Transition: minimum 100 MHz
Operating Temperature Range: -55°C to 150°C minimum
Mounting Type: Surface Mount
Package / Case: TO-236-3, SC-59, or SOT-23-3 compatible

Secondary Compatibility Parameters:

Current - Collector (Ic) Max: 500 mA or greater
DC Current Gain (hFE) Min: 100 or greater at specified test conditions
Vce Saturation: 700 mV or less at specified conditions

Substitute parts are grouped into two categories based on current handling capability:

Category A - Full Current Rating (800 mA): Parts meeting or exceeding the 800 mA collector current specification of the BCW66G-TP.

Category B - Reduced Current Rating (500-600 mA): Parts with collector current ratings between 500 mA and 600 mA, suitable for applications where the full 800 mA capability is not required.

Parameter Comparison

Parameter	BCW66G-TP	BC817-16 RFG	BC817-25 RFG	BC817-40 RFG	BCW66GLT1G	BCW66GVL	MMBT2222A RFG
Manufacturer	Micro Commercial Co	Taiwan Semiconductor	Taiwan Semiconductor	Taiwan Semiconductor	onsemi	Nexperia USA Inc.	Taiwan Semiconductor
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN	NPN
Ic (Max) [mA]	800	500	500	500	800	800	600
Vce Breakdown (Max) [V]	45	45	45	45	45	45	40
Vce Saturation (Max) [mV]	700 @ 50mA, 500mA	700 @ 50mA, 500mA	700 @ 50mA, 500mA	700 @ 50mA, 500mA	700 @ 50mA, 500mA	450 @ 50mA, 500mA	1000 @ 50mA, 500mA
Icbo (Max)	20 nA	100 nA	100 nA	100 nA	20 nA	5 µA	10 nA
hFE (Min) @ Ic, Vce	160 @ 100mA, 1V	100 @ 100mA, 1V	160 @ 100mA, 1V	250 @ 100mA, 1V	160 @ 100mA, 1V	160 @ 100mA, 1V	100 @ 150mA, 10V
Power (Max) [mW]	200	300	300	300	300	250	300
Frequency - Transition [MHz]	100	100	100	100	100	100	300
Operating Temperature [°C]	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
Package	SOT-23	SOT-23	SOT-23	SOT-23	SOT-23-3	TO-236AB	SOT-23
Packaging Format	Bulk	Tape & Reel	Tape & Reel	Tape & Reel	Tape & Reel	Tape & Reel	Tape & Reel
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Category A - Full Current Rating Substitutes (800 mA):

BCW66GLT1G (onsemi): This part maintains electrical equivalence to the BCW66G-TP across all critical parameters, including 800 mA collector current, 45 V breakdown voltage, 100 MHz transition frequency, and identical DC current gain specification. The device is ROHS3 compliant and available in high volume (380,300 units). Packaging is supplied as Tape & Reel in SOT-23-3 format, compatible with the original specification. Power dissipation is rated at 300 mW, exceeding the 200 mW specification of the BCW66G-TP.

BCW66GVL (Nexperia USA Inc.): This part meets the 800 mA current requirement and 45 V breakdown voltage specification. The device carries AEC-Q101 automotive qualification and is ROHS3 compliant. Operating temperature range extends to 150°C. Vce saturation is specified at 450 mV, lower than the BCW66G-TP specification of 700 mV, indicating improved switching performance. Collector cutoff current is specified at 5 µA, higher than the BCW66G-TP at 20 nA. Power dissipation is rated at 250 mW. Packaging is supplied as Tape & Reel in TO-236AB format.

Category B - Reduced Current Rating Substitutes (500-600 mA):

BC817-16 RFG (Taiwan Semiconductor Corporation): This part is suitable for applications where collector current does not exceed 500 mA. Electrical parameters match the BCW66G-TP for voltage breakdown (45 V), transition frequency (100 MHz), and operating temperature range (-55°C to 150°C). DC current gain is specified at 100 @ 100 mA, 1 V, lower than the BCW66G-TP minimum of 160. The device is ROHS3 compliant with MSL rating of 1 (Unlimited). Packaging is Tape & Reel in SOT-23 format.

BC817-25 RFG (Taiwan Semiconductor Corporation): This part is suitable for applications where collector current does not exceed 500 mA. Electrical parameters match the BCW66G-TP for voltage breakdown (45 V), transition frequency (100 MHz), and operating temperature range (-55°C to 150°C). DC current gain is specified at 160 @ 100 mA, 1 V, matching the BCW66G-TP specification. The device is ROHS3 compliant with MSL rating of 1 (Unlimited). Packaging is Tape & Reel in SOT-23 format. Inventory availability is 86,300 units.

BC817-40 RFG (Taiwan Semiconductor Corporation): This part is suitable for applications where collector current does not exceed 500 mA. Electrical parameters match the BCW66G-TP for voltage breakdown (45 V), transition frequency (100 MHz), and operating temperature range (-55°C to 150°C). DC current gain is specified at 250 @ 100 mA, 1 V, exceeding the BCW66G-TP minimum of 160. The device is ROHS3 compliant with MSL rating of 1 (Unlimited). Packaging is Tape & Reel in SOT-23 format.

MMBT2222A RFG (Taiwan Semiconductor Corporation): This part operates at reduced voltage and current specifications relative to the BCW66G-TP. Collector-emitter breakdown voltage is 40 V, below the 45 V specification of the BCW66G-TP. Collector current is rated at 600 mA, below the 800 mA specification. Transition frequency is 300 MHz, exceeding the 100 MHz specification. Vce saturation is specified at 1000 mV @ 50 mA, 500 mA, higher than the BCW66G-TP specification of 700 mV. This part is suitable only for applications with reduced voltage and current requirements. The device is ROHS3 compliant. Packaging is Tape & Reel in SOT-23 format.

Frequently Asked Questions (FAQ)

Q: Can BC817-16 RFG be used as a direct replacement for BCW66G-TP?

A: BC817-16 RFG is electrically compatible with BCW66G-TP for applications where collector current does not exceed 500 mA. Both devices share identical voltage breakdown (45 V), transition frequency (100 MHz), and operating temperature range (-55°C to 150°C). However, the BC817-16 RFG has a lower DC current gain minimum (100 vs. 160), which may affect circuit performance in gain-dependent applications. Packaging is compatible (SOT-23).

Q: What is the primary difference between BC817-25 RFG and BC817-40 RFG?

A: Both parts are electrically equivalent except for DC current gain specification. BC817-25 RFG specifies a minimum hFE of 160 @ 100 mA, 1 V, matching the BCW66G-TP. BC817-40 RFG specifies a minimum hFE of 250 @ 100 mA, 1 V, providing higher current gain. Both are rated for 500 mA maximum collector current and share identical voltage and frequency specifications.

Q: Is BCW66GLT1G a pin-for-pin replacement for BCW66G-TP?

A: BCW66GLT1G is mechanically and electrically compatible with BCW66G-TP. Both devices use SOT-23 package variants (SOT-23-3 and TO-236-3 are equivalent designations). Pin configuration is identical. Electrical specifications are equivalent across all critical parameters: 800 mA collector current, 45 V breakdown voltage, 100 MHz transition frequency, and 160 minimum DC current gain.

Q: Why does MMBT2222A RFG have a higher transition frequency than BCW66G-TP?

A: MMBT2222A RFG is specified with a 300 MHz transition frequency compared to 100 MHz for BCW66G-TP. This reflects different device design and semiconductor process technology. However, MMBT2222A RFG operates at reduced voltage (40 V vs. 45 V) and current (600 mA vs. 800 mA) specifications, making it suitable only for applications with lower electrical requirements.

Q: What is the significance of Vce saturation differences between BCW66GVL and BCW66G-TP?

A: BCW66GVL specifies Vce saturation at 450 mV @ 50 mA, 500 mA, compared to 700 mV for BCW66G-TP. Lower saturation voltage indicates reduced voltage drop across the transistor in the saturated state, resulting in lower power dissipation and improved switching efficiency. This characteristic makes BCW66GVL suitable for applications requiring optimized thermal performance.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. The BCW66G-TP does not specify RoHS status in the provided data. All substitute devices carry explicit ROHS3 Compliant designation and are suitable for applications requiring RoHS compliance.

Q: What packaging format differences exist between substitute parts?

A: BCW66G-TP is supplied in Bulk packaging. All substitute parts are supplied in Tape & Reel (TR) format. BCW66GLT1G and BCW66GVL use SOT-23-3 (TO-236) package designations, while BC817 variants and MMBT2222A RFG use standard SOT-23 designation. All packages are mechanically compatible with TO-236-3, SC-59, or SOT-23-3 footprints.

Q: Can MMBT2222A RFG be used in applications designed for BCW66G-TP?

A: MMBT2222A RFG is not recommended as a direct replacement for BCW66G-TP due to reduced electrical specifications. The 40 V breakdown voltage is below the 45 V requirement, and 600 mA collector current is below the 800 mA specification. Use MMBT2222A RFG only in applications with confirmed reduced voltage and current requirements.

Q: What is the inventory status of substitute parts?

A: BCW66GLT1G has the highest inventory availability at 380,300 units. BC817-25 RFG has 86,300 units. BCW66GVL has 87,535 units. BC817-40 RFG has 5,598 units. BC817-16 RFG has 7,087 units. MMBT2222A RFG has 20,864 units. BCW66G-TP has 764 units in stock.

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