BC848B Equivalent & Substitute Parts

Part Overview

The BC848B is an NPN bipolar junction transistor manufactured by Taiwan Semiconductor Corporation, designed for general-purpose switching and amplification applications. This surface mount device operates at 30V maximum collector-emitter voltage with a maximum collector current of 100mA and dissipates up to 200mW of power. The BC848B is classified as an active product with full RoHS3 compliance and is suitable for applications requiring compact SOT-23 packaging. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific performance requirements across multiple manufacturers.

Key Parameters

Parameter	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	500mV @ 5mA, 100mA	—
Current - Collector Cutoff (Max)	100	nA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BC848B is determined by strict equivalence across the following critical parameters: transistor type (NPN), maximum collector-emitter voltage (30V), maximum collector current (100mA), transition frequency (100MHz), and surface mount packaging (SOT-23 or TO-236-3 variants). Parts are grouped into two categories based on parametric alignment:

Parametric Equivalents maintain identical electrical specifications including DC current gain (hFE minimum of 110 @ 2mA, 5V), Vce saturation (500mV @ 5mA, 100mA), and collector cutoff current (100nA ICBO). These parts are direct functional replacements with no performance trade-offs.

Similar Parts share the core voltage, current, and frequency ratings but exhibit variations in one or more secondary parameters such as maximum power dissipation (225mW to 300mW), DC current gain (ranging from 110 to 420), Vce saturation (500mV to 600mV), or collector cutoff current (15nA to 100nA). These parts are suitable for applications where the specified parameter variations do not impact circuit performance.

Manufacturer differences and packaging variants (Tape & Reel versus bulk) do not affect electrical substitutability when core parameters align.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Power (Max) mW	hFE (Min) @ 2mA, 5V	Vce Sat (Max) @ 5mA, 100mA	Icbo (Max) nA	Freq (MHz)	Temp Range °C	Package
BC848B	Taiwan Semiconductor Corporation	100	30	200	110	500mV @ 5mA, 100mA	100	100	-55 to 150	SOT-23
BC848A RFG	Taiwan Semiconductor Corporation	100	30	200	110	500mV @ 5mA, 100mA	100	100	-55 to 150	SOT-23
BC848A	MDD	100	30	200	110	500mV @ 5mA, 100mA	100	100	-65 to 150	SOT-23
BC848A-TP	Micro Commercial Co	100	30	225	110	500mV @ 5mA, 100mA	100	100	-55 to 150	SOT-23
BC848B,235	Nexperia USA Inc.	100	30	250	200	600mV @ 5mA, 100mA	15	100	-55 to 150	TO-236AB
BC848C-TP	Micro Commercial Co	100	30	225	420	500mV @ 5mA, 100mA	100	100	-55 to 150	SOT-23
BC849BLT1G	onsemi	100	30	300	200	600mV @ 5mA, 100mA	15	100	-55 to 150	SOT-23-3 (TO-236)
BC849C,235	Nexperia USA Inc.	100	30	250	420	600mV @ 5mA, 100mA	15	100	-55 to 150	TO-236AB

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacements)

BC848A RFG and BC848A (MDD) are parametric equivalents to the BC848B, maintaining identical electrical specifications across all critical parameters. Both parts are active products with RoHS3 compliance. BC848A RFG is supplied in Tape & Reel packaging, while BC848A (MDD) offers extended lower operating temperature (-65°C minimum versus -55°C) and is available in higher inventory quantities (72,300 pieces).

Similar Parts with Acceptable Parameter Variations

BC848A-TP (Micro Commercial Co) provides a 225mW power rating versus the 200mW specification of the BC848B, with all other electrical parameters matching. This part is suitable for applications where the additional 25mW dissipation capacity does not create thermal constraints.

BC848B,235 (Nexperia USA Inc.) and BC849BLT1G (onsemi) exhibit higher DC current gain (200 versus 110), increased Vce saturation (600mV versus 500mV), and reduced collector cutoff current (15nA versus 100nA). BC848B,235 carries automotive qualification (AEC-Q101) and is suitable for automotive applications. BC849BLT1G offers the highest power dissipation (300mW) among the substitute group.

BC848C-TP (Micro Commercial Co) and BC849C,235 (Nexperia USA Inc.) feature significantly higher DC current gain (420 versus 110). BC849C,235 includes automotive qualification (AEC-Q101) and is suitable for automotive-grade applications requiring higher current gain performance.

All substitute parts maintain the 30V collector-emitter breakdown voltage, 100mA maximum collector current, and 100MHz transition frequency required for BC848B compatibility. Selection should be based on specific application requirements for power dissipation, current gain, and saturation voltage characteristics.

Frequently Asked Questions (FAQ)

Q: Can BC848A RFG be used as a direct replacement for BC848B?

A: Yes. BC848A RFG is a parametric equivalent with identical electrical specifications: 100mA collector current, 30V breakdown voltage, 110 minimum DC current gain, 500mV Vce saturation, and 100MHz transition frequency. Both are RoHS3 compliant and use SOT-23 packaging.

Q: What is the difference between BC848B and BC848B,235?

A: BC848B,235 (Nexperia) differs in DC current gain (200 versus 110), Vce saturation (600mV versus 500mV), collector cutoff current (15nA versus 100nA), and maximum power dissipation (250mW versus 200mW). BC848B,235 includes automotive qualification (AEC-Q101). Both maintain 30V, 100mA, and 100MHz specifications.

Q: Are BC849 series parts compatible with BC848B applications?

A: BC849BLT1G and BC849C,235 share the same voltage, current, and frequency ratings as BC848B but feature higher DC current gain (200 to 420 versus 110) and higher Vce saturation (600mV versus 500mV). These parts are compatible in applications where higher current gain does not cause circuit instability and where the increased saturation voltage is acceptable.

Q: What packaging options are available for BC848B substitutes?

A: All substitute parts use surface mount packaging: SOT-23, SOT-23-3, or TO-236AB variants. These are mechanically and electrically equivalent package designations for the same physical form factor. Packaging is supplied in Tape & Reel format for all listed substitutes.

Q: Does the operating temperature range affect substitutability?

A: The BC848B operates from -55°C to 150°C. BC848A (MDD) extends the lower limit to -65°C, providing broader temperature coverage. All other substitutes maintain the -55°C to 150°C range. Selection should account for application temperature requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification. BC848B,235 and BC849C,235 additionally carry automotive qualification (AEC-Q101) for applications requiring automotive-grade components.

Q: What is the significance of DC current gain (hFE) variation among substitutes?

A: DC current gain ranges from 110 (BC848A variants) to 420 (BC848C-TP, BC849C,235). Higher current gain reduces base current requirements for a given collector current. Applications sensitive to base current or biasing networks should account for this variation when selecting substitutes.

Q: Can BC848A-TP be used in high-power applications?

A: BC848A-TP dissipates 225mW maximum, compared to 200mW for BC848B. This 25mW increase provides modest additional thermal margin but does not qualify the part for high-power applications. Thermal design should account for the specific power dissipation of the selected part.

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