Equivalent & Substitute Parts for BC849CW

Part Overview

The BC849CW is a surface mount NPN bipolar junction transistor (BJT) manufactured by Taiwan Semiconductor Corporation in a SOT-323 package. It features a maximum collector-emitter voltage of 30 V, a maximum collector current of 100 mA, a power rating of 200 mW, and a minimum DC current gain of 420 @ 2 mA, 5 V. Its transition frequency is 100 MHz, and it complies with ROHS3 and REACH regulations. The part is currently listed as “Active” with substantial inventory. Finding substitute or equivalent transistor models is necessary to ensure design flexibility, supply chain robustness, and maintenance of product lifecycle requirements in the Transistors, Bipolar (BJT) component category.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	30 V
Current - Collector (Ic) (Max)	100 mA
DC Current Gain (hFE) (Min) @ Ic, Vce	420 @ 2mA, 5V
Frequency - Transition	100 MHz
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5mA, 100mA
Current - Collector Cutoff (Max)	15 nA (ICBO)
Power - Max	200 mW
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	SC-70, SOT-323

Substitute Part Grouping Explanation

Substitute and equivalent parts for the BC849CW are selected strictly by matching the following key parameters: Transistor Type, maximum collector-emitter voltage, maximum collector current, DC current gain, transition frequency, saturation voltage, collector cutoff current, maximum power dissipation, operating temperature, mounting type, and package/case. Only parts with these matching or exceeding specifications and the same surface mount SOT-323 (SC-70) package have been included as alternatives. All listed substitutes meet electrical, thermal, and mechanical requirements as stipulated by the input data.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Transistor Type	V_CE (Max)	I_C (Max)	hFE (Min) @ Ic, Vce	f_T	Vce(sat) (Max)	I_CBO (Max)	Power (Max)	Operating Temp	Mounting Type	Package / Case
BC849CW	Taiwan Semiconductor Corporation	NPN	30 V	100 mA	420 @ 2mA, 5V	100 MHz	600 mV @ 5mA, 100mA	15 nA	200 mW	-55°C ~ 150°C	Surface Mount	SC-70, SOT-323
BC848CWT1G	Fairchild Semiconductor	NPN	30 V	100 mA	420 @ 2mA, 5V	100 MHz	600 mV @ 5mA, 100mA	15 nA	150 mW	-55°C ~ 150°C	Surface Mount	SC-70, SOT-323
BC848W,115	Nexperia USA Inc.	NPN	30 V	100 mA	110 @ 2mA, 5V	100 MHz	600 mV @ 5mA, 100mA	15 nA	200 mW	150°C	Surface Mount	SC-70, SOT-323
BC846CW	Taiwan Semiconductor Corporation	NPN	65 V	100 mA	420 @ 2mA, 5V	100 MHz	600 mV @ 5mA, 100mA	15 nA	200 mW	-55°C ~ 150°C	Surface Mount	SC-70, SOT-323
BC849CW,115	NXP USA Inc.	NPN	30 V	100 mA	420 @ 2mA, 5V	100 MHz	600 mV @ 5mA, 100mA	15 nA	200 mW	150°C	Surface Mount	SC-70, SOT-323
BC849CW,135	NXP USA Inc.	NPN	30 V	100 mA	420 @ 2mA, 5V	100 MHz	600 mV @ 5mA, 100mA	15 nA	200 mW	150°C	Surface Mount	SC-70, SOT-323

Engineering Selection Recommendations

BC849CW and all listed substitutes hold “Active” product status. Compliance details, where available, include ROHS3 and REACH status. BC848W,115, BC849CW,115, and BC849CW,135 carry automotive grade qualification AEC-Q101. All substitute parts remain compliant with EAR99 ECCN and HTSUS: 8541.21.0075 classifications. These factors are the sole basis for selection in environments requiring lifecycle continuity, compliance with environmental regulations, and alignment with certification requirements.

Frequently Asked Questions (FAQ)

Q1: What criteria are used to identify substitute BJTs for BC849CW?
Substitute parts are selected strictly based on matching transistor type, voltage ratings, current ratings, DC current gain, transition frequency, saturation voltage, cutoff current, power dissipation, operating temperature, and SOT-323 (SC-70) surface mount packaging.

Q2: Are all listed substitutes compatible with the BC849CW footprint?
Yes. All alternatives use the SC-70/SOT-323 package, ensuring mechanical compatibility in PCB layouts designed for BC849CW.

Q3: How do compliance and qualification affect substitution?
Compliance to ROHS3, REACH, and presence of automotive grade AEC-Q101 qualification are included for selection where provided. All catalogued substitutes fulfill environmental and lifecycle certification status as specified.

Q4: What electrical parameters must be matched for equivalence?
The key parameters are: NPN transistor type, collector-emitter voltage and current ratings, minimum DC current gain, frequency rating, saturation voltage, cutoff current, and package type.

Q5: Does power rating affect substitution?
Only substitutes with power ratings equal to or exceeding that of BC849CW are listed, ensuring safe operation within the application’s thermal constraints when following the original design.

Q6: Are there performance differences among substitutes?
All substitutes nominally match or exceed the critical electrical and mechanical parameters provided; evaluation for unique application-specific performance must reference the input specifications only.

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