BC849AW Equivalent & Substitute Parts

Part Overview

The BC849AW is an NPN bipolar junction transistor manufactured by Taiwan Semiconductor Corporation, designed for small-signal switching and amplification applications. This device features a 30V collector-emitter breakdown voltage, 100mA maximum collector current, and 200mW power dissipation in a surface-mount SOT-323 package. The BC849AW holds Active product status with 885 pieces currently in stock. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific requirements where alternative manufacturers or enhanced specifications are beneficial.

Key Parameters

Parameter	BC849AW Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	30	V
Current - Collector (Ic) (Max)	100	mA
Power - Max	200	mW
Frequency - Transition	100	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	110 @ 2mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	600mV @ 5mA, 100mA	—
Current - Collector Cutoff (Max)	15	nA
Operating Temperature Range	-55 to 150	°C
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the BC849AW is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 30V
Current - Collector (Ic) (Max): 100mA
Vce Saturation (Max) @ Ib, Ic: 600mV @ 5mA, 100mA
Current - Collector Cutoff (Max): 15nA (ICBO)
Package / Case: SC-70, SOT-323
Mounting Type: Surface Mount

Parameters Permitting Variation:

Power - Max: 150mW to 250mW (equal to or greater than 200mW acceptable)
Frequency - Transition: 100MHz to 250MHz (equal to or greater than 100MHz acceptable)
DC Current Gain (hFE) (Min): 110 to 420 @ 2mA, 5V (equal to or greater than 110 acceptable)
Operating Temperature Range: -55°C to 150°C (upper limit 150°C minimum acceptable)

Substitute parts are grouped by manufacturer and product status. All identified substitutes maintain full electrical and mechanical compatibility with the BC849AW while offering alternative sourcing options and, in certain cases, enhanced performance specifications.

Parameter Comparison

Parameter	BC849AW (TSC)	BC848BWH6327XTSA1 (Infineon)	BC848BWT106 (Rohm)	BC848CWT1G (Fairchild)	BC848W,115 (Nexperia)
Transistor Type	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	30V	30V	30V	30V	30V
Current - Collector (Ic) (Max)	100mA	100mA	100mA	100mA	100mA
Power - Max	200mW	250mW	200mW	150mW	200mW
Frequency - Transition	100MHz	250MHz	200MHz	100MHz	100MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	110 @ 2mA, 5V	200 @ 2mA, 5V	200 @ 2mA, 5V	420 @ 2mA, 5V	110 @ 2mA, 5V
Vce Saturation (Max) @ Ib, Ic	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA
Current - Collector Cutoff (Max)	15nA	15nA	100nA	15nA	15nA
Operating Temperature Range	-55 to 150°C	150°C (Max)	150°C (Max)	-55 to 150°C	150°C (Max)
Package / Case	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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Last Time Buy	Active	Active	Active

Engineering Selection Recommendations

BC848W,115 (Nexperia USA Inc.)

The BC848W,115 is a parametric equivalent offering identical electrical specifications to the BC849AW with 15,100 pieces in stock. This part qualifies for automotive applications under AEC-Q101 certification and carries Active product status. Selection of this part is appropriate for designs requiring automotive-grade components or where Nexperia supply chain preference is established.

BC848BWT106 (Rohm Semiconductor)

The BC848BWT106 maintains full electrical compatibility with the BC849AW and provides the highest inventory availability at 61,700 pieces. This part carries Active product status and is supplied in Cut Tape and Digi-Reel packaging. The collector cutoff current specification of 100nA represents a minor deviation from the BC849AW baseline of 15nA; this remains within acceptable substitution parameters for general-purpose switching applications.

BC848BWH6327XTSA1 (Infineon Technologies)

The BC848BWH6327XTSA1 offers enhanced performance specifications with 250mW power dissipation and 250MHz transition frequency, exceeding the BC849AW baseline. This part carries Last Time Buy status with 894 pieces available. Selection is appropriate for applications requiring higher frequency operation or thermal margin, provided supply continuity is confirmed with the manufacturer.

BC848CWT1G (Fairchild Semiconductor)

The BC848CWT1G provides full electrical compatibility with the BC849AW and features the highest DC current gain specification at 420 (minimum). This part carries Active product status with 15,400 pieces in stock. The 150mW power rating represents a reduction from the BC849AW baseline; selection is appropriate for low-power applications where thermal dissipation is not a limiting factor.

Frequently Asked Questions (FAQ)

Q: Can the BC848W,115 directly replace the BC849AW in existing designs?

A: Yes. The BC848W,115 maintains identical electrical specifications across all critical parameters including voltage rating, current rating, saturation voltage, and frequency response. Direct substitution is supported without circuit modification. The part qualifies for automotive applications under AEC-Q101 certification.

Q: What is the significance of the BC848BWH6327XTSA1 Last Time Buy status?

A: Last Time Buy status indicates that Infineon has announced end-of-life for this part number. While 894 pieces are currently available, future procurement may not be possible. This part is suitable for immediate requirements but should not be selected for long-term production planning without confirming alternative sourcing.

Q: How does the BC848BWT106 collector cutoff current specification of 100nA compare to the BC849AW baseline of 15nA?

A: The BC848BWT106 exhibits higher leakage current at 100nA versus the BC849AW baseline of 15nA. This specification remains within acceptable substitution parameters for switching applications. In precision analog circuits requiring minimal leakage, the BC849AW or BC848CWT1G are preferred.

Q: Is the BC848CWT1G suitable for applications requiring 200mW power dissipation?

A: The BC848CWT1G is rated for 150mW maximum power dissipation, which is below the BC849AW baseline of 200mW. This part is suitable for applications where power dissipation does not exceed 150mW. For designs requiring the full 200mW capability, select BC849AW, BC848W,115, BC848BWT106, or BC848BWH6327XTSA1.

Q: Are all substitute parts available in SOT-323 packaging?

A: Yes. All identified substitute parts are supplied in SC-70 or SOT-323 surface-mount packages with identical pin configurations and footprints. PCB layout and assembly processes require no modification.

Q: Which substitute part offers the highest frequency performance?

A: The BC848BWH6327XTSA1 provides 250MHz transition frequency, compared to the BC849AW baseline of 100MHz. The BC848BWT106 offers 200MHz transition frequency. Both parts support higher-frequency applications while maintaining full voltage and current compatibility.

Q: Do all substitute parts comply with RoHS and REACH regulations?

A: Yes. All identified substitute parts carry ROHS3 compliance and REACH Unaffected status, matching the BC849AW regulatory profile. All parts are suitable for applications subject to environmental compliance requirements.

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