BC849B-AP Equivalent & Substitute Parts

Part Overview

The BC849B-AP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This device operates at 30 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and transition frequency of 100 MHz. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility within specified parameter ranges.

Key Parameters

Parameter	BC849B-AP Value	Unit
Transistor Type	NPN	—
Collector Current (Ic) Max	100	mA
Collector-Emitter Breakdown Voltage (Max)	30	V
Vce Saturation (Max) @ Ib, Ic	500 mV @ 5 mA, 100 mA	—
Collector Cutoff Current (Max)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	200 @ 2 mA, 5 V	—
Power Dissipation (Max)	225	mW
Transition Frequency	100	MHz
Operating Temperature Range	−55 to 150	°C
Package Type	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the BC849B-AP are classified into three categories based on electrical parameter compatibility and product status:

Direct Substitutes maintain identical or superior electrical specifications within the same package footprint (SOT-23-3). These parts satisfy all critical parameters: NPN transistor type, 30 V minimum collector-emitter breakdown voltage, 100 mA collector current rating, 100 MHz transition frequency, and surface mount SOT-23-3 packaging. Direct substitutes are preferred for drop-in replacement applications.

Upgrade Substitutes provide enhanced specifications while maintaining backward compatibility. These parts exceed minimum requirements in power dissipation, transition frequency, or current gain while preserving the same voltage and current ratings and package type. Upgrade substitutes are suitable when improved performance margins are beneficial.

Similar Alternatives share the same package and core electrical characteristics but may differ in secondary parameters such as transition frequency, power dissipation, or current gain specifications. These parts are compatible when the application does not require the exact specifications of the original part.

Substitution eligibility is determined by the following mandatory parameters:

Transistor type: NPN
Collector current (Ic) rating: minimum 100 mA
Collector-emitter breakdown voltage: minimum 30 V
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
RoHS compliance: ROHS3 Compliant

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce(br) (Max) V	Vce Sat (Max) mV	hFE (Min) @ 2mA, 5V	Power (Max) mW	Freq (MHz)	Temp Range °C	Package
BC849B-AP	Micro Commercial Co	Obsolete	100	30	500	200	225	100	−55 to 150	SOT-23-3
BC849B,215	Nexperia USA Inc.	Active	100	30	600	200	250	100	−55 to 150	SOT-23-3
BCW32LT1G	onsemi	Active	100	32	250	200	225	—	−55 to 150	SOT-23-3
BC849B,235	Nexperia USA Inc.	Active	100	30	600	200	250	100	−55 to 150	SOT-23-3
NSVBCW32LT1G	onsemi	Active	100	32	250	200	225	—	−55 to 150	SOT-23-3
BC848AE6327HTSA1	Infineon Technologies	Obsolete	100	30	600	110	330	250	−55 to 150	SOT-23-3
BC848B RFG	Taiwan Semiconductor Corporation	Active	100	30	500	200	200	100	−55 to 150	SOT-23-3
BC848B-13-F	Diodes Incorporated	Active	100	30	600	450	310	300	−65 to 150	SOT-23-3
BC848C RFG	Taiwan Semiconductor Corporation	Active	100	30	500	420	200	100	−55 to 150	SOT-23-3
BC849BLT1G	onsemi	Active	100	30	600	200	300	100	−55 to 150	SOT-23-3
BC849C,235	Nexperia USA Inc.	Active	100	30	600	420	250	100	−55 to 150	SOT-23-3

Engineering Selection Recommendations

Primary Recommendation: BC849B,215 (Nexperia USA Inc.)

BC849B,215 is the optimal direct substitute for BC849B-AP. This part maintains identical electrical specifications across all critical parameters: 100 mA collector current, 30 V collector-emitter breakdown voltage, 100 MHz transition frequency, and SOT-23-3 package compatibility. The part is active in production with AEC-Q101 automotive qualification, ensuring long-term availability and supply chain stability. RoHS3 compliance and unlimited moisture sensitivity level (MSL 1) match the original specification.

Secondary Recommendation: BC849B,235 (Nexperia USA Inc.)

BC849B,235 provides identical electrical performance to BC849B,215 with equivalent active product status and automotive qualification. This variant is suitable for applications requiring tape and reel packaging in higher volume quantities. Both Nexperia variants are functionally interchangeable with the obsolete BC849B-AP.

Alternative Recommendation: BCW32LT1G (onsemi)

BCW32LT1G is an active substitute offering enhanced collector-emitter breakdown voltage (32 V versus 30 V), providing additional voltage margin. This part maintains 100 mA collector current, 100 mW power dissipation equivalent to the original, and identical SOT-23-3 package footprint. The BCW32LT1G is suitable for applications where voltage headroom improvement is advantageous.

Performance-Enhanced Alternative: BC849BLT1G (onsemi)

BC849BLT1G provides superior power dissipation capability (300 mW versus 225 mW) while maintaining all other specifications identical to BC849B-AP. This part is active in production and suitable for applications requiring increased thermal margin or higher power handling capacity within the same package.

Compatibility Note for BC848 Series

BC848B RFG, BC848B-13-F, and BC848C RFG are similar alternatives sharing the same package and voltage/current ratings. These parts are compatible with BC849B-AP in applications where the BC848 base product number is acceptable. BC848B-13-F offers enhanced transition frequency (300 MHz) and power dissipation (310 mW) for performance-critical applications.

Frequently Asked Questions (FAQ)

Q: Can BC849B,215 be used as a direct replacement for BC849B-AP?

A: Yes. BC849B,215 is a direct substitute meeting all electrical and mechanical requirements. Both parts are NPN transistors with 100 mA collector current, 30 V breakdown voltage, 100 MHz transition frequency, and SOT-23-3 package compatibility. BC849B,215 is active in production, addressing the obsolescence of BC849B-AP.

Q: What is the difference between BC849B,215 and BC849B,235?

A: Both parts are electrically identical with matching specifications. The primary difference is packaging format: BC849B,215 is supplied in cut tape and digi-reel format, while BC849B,235 is supplied in tape and reel format. Selection depends on procurement and assembly requirements.

Q: Is BCW32LT1G compatible with BC849B-AP?

A: Yes, with the following consideration: BCW32LT1G has a higher collector-emitter breakdown voltage rating (32 V versus 30 V). This provides additional voltage margin and is compatible in all applications designed for BC849B-AP. The 32 V rating does not create incompatibility; it represents an enhancement.

Q: Why do some substitute parts have different transition frequencies?

A: Transition frequency is a secondary parameter that does not affect substitutability for general-purpose switching applications. BC849B-AP specifies 100 MHz; substitutes with higher frequencies (such as BC848B-13-F at 300 MHz) are fully compatible and provide performance margin. Substitutes with unspecified transition frequency (such as BCW32LT1G) are also compatible when transition frequency is not a critical application requirement.

Q: Can BC848 series parts replace BC849B-AP?

A: Yes. BC848B RFG, BC848B-13-F, and BC848C RFG are compatible alternatives. All three parts share identical package (SOT-23-3), voltage rating (30 V), and current rating (100 mA) with BC849B-AP. The primary difference is the base product number (BC848 versus BC849), which does not affect electrical compatibility. These parts are suitable when BC848 series availability is preferred.

Q: What is the significance of AEC-Q101 qualification on substitute parts?

A: AEC-Q101 qualification indicates automotive-grade reliability testing and is present on BC849B,215, BC849B,235, and BC849C,235. This qualification is not required for BC849B-AP but provides additional assurance of quality and long-term availability for applications requiring automotive-grade components.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance matching BC849B-AP. This ensures compatibility with environmental and regulatory requirements across all recommended alternatives.

Q: Can BC849BLT1G be used in place of BC849B-AP?

A: Yes. BC849BLT1G is fully compatible with enhanced power dissipation capability (300 mW versus 225 mW). This part is suitable for applications where thermal margin improvement is beneficial or where the original design can accommodate the higher power rating without modification.

Q: What packaging options are available for BC849B substitutes?

A: All recommended substitutes use SOT-23-3 (TO-236-3, SC-59) surface mount package, maintaining identical PCB footprint and assembly compatibility with BC849B-AP. Packaging format variations (cut tape, digi-reel, or tape and reel) do not affect electrical or mechanical compatibility; selection depends on procurement and assembly process requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message