BC848B Equivalent & Substitute Parts

Part Overview

The BC848B is an NPN bipolar junction transistor (BJT) manufactured by Diotec Semiconductor in the SOT-23-3 surface mount package. This device is rated for 30 V collector-emitter breakdown voltage, 100 mA maximum collector current, and 250 mW maximum power dissipation. The BC848B operates across a temperature range of -55°C to 150°C and features a transition frequency of 300 MHz with a minimum DC current gain (hFE) of 200 at 2 mA collector current and 5 V collector-emitter voltage.

The BC848B maintains Active product status and is widely used in general-purpose switching and amplification applications. Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and package specifications to ensure direct functional replacement in circuit designs.

Key Parameters

Parameter	BC848B	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	30	V
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5 mA, 100 mA	—
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) Min @ Ic, Vce	200 @ 2 mA, 5 V	—
Power - Max	250	mW
Frequency - Transition	300	MHz
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3 (TO-236)	—

Substitute Part Grouping Explanation

Substitute parts for the BC848B are classified into two categories based on electrical parameter alignment:

Parametric Equivalent: Parts that match all critical electrical specifications including collector current (100 mA), collector-emitter breakdown voltage (30 V), DC current gain (200 @ 2 mA, 5 V), saturation voltage (600 mV @ 5 mA, 100 mA), and collector cutoff current (15 nA). These parts are direct functional replacements with identical performance characteristics.

Similar Parts: Parts that maintain compatibility in collector current (100 mA), collector-emitter breakdown voltage (30 V or higher), operating temperature range (-55°C to 150°C), and package form factor (SOT-23-3), but differ in one or more of the following parameters: transition frequency (100 MHz versus 300 MHz), power dissipation rating (200–225 mW versus 250 mW), DC current gain (110–420 @ 2 mA, 5 V), saturation voltage (500 mV versus 600 mV), or collector cutoff current (100 nA versus 15 nA). These parts are suitable for applications where the specific parameter variation does not impact circuit performance.

Substitution logic is based strictly on the following key parameters:

Transistor type (NPN)
Maximum collector current (100 mA)
Collector-emitter breakdown voltage (30 V minimum)
Operating temperature range (-55°C to 150°C)
Surface mount package compatibility (SOT-23-3 / TO-236)

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	hFE Min @ 2mA, 5V	Vce Sat (Max) mV	Icbo (Max) nA	Power (Max) mW	Freq (MHz)	Temp Range °C	Package
BC848B	Diotec Semiconductor	100	30	200	600	15	250	300	-55 to 150	SOT-23-3
BC849B	Diotec Semiconductor	100	30	200	600	15	250	300	-55 to 150	SOT-23-3
BC848A RFG	Taiwan Semiconductor Corporation	100	30	110	500	100	200	100	-55 to 150	SOT-23-3
BC848A-TP	Micro Commercial Co	100	30	110	500	100	225	100	-55 to 150	SOT-23-3
BC848B RFG	Taiwan Semiconductor Corporation	100	30	200	500	100	200	100	-55 to 150	SOT-23-3
BC848C RFG	Taiwan Semiconductor Corporation	100	30	420	500	100	200	100	-55 to 150	SOT-23-3
BC848C-TP	Micro Commercial Co	100	30	420	500	100	225	100	-55 to 150	SOT-23-3
BC849BLT1G	onsemi	100	30	200	600	15	300	100	-55 to 150	SOT-23-3
BCW32,215	Nexperia USA Inc.	100	32	200	210	100	250	100	-55 to 150	SOT-23-3

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent):

BC849B from Diotec Semiconductor is the parametric equivalent to BC848B. Both devices share identical electrical specifications: 100 mA collector current, 30 V breakdown voltage, 200 hFE minimum, 600 mV saturation voltage, 15 nA collector cutoff current, 250 mW power rating, and 300 MHz transition frequency. Both maintain Active product status and are compatible with SOT-23-3 surface mount applications across the -55°C to 150°C operating range.

Compatible Substitutes with Parameter Variations:

BC848A RFG and BC848A-TP are suitable substitutes where lower transition frequency (100 MHz versus 300 MHz) and reduced DC current gain (110 versus 200) are acceptable. These parts maintain the 100 mA collector current, 30 V breakdown voltage, and SOT-23-3 package compatibility. The lower saturation voltage (500 mV) and higher collector cutoff current (100 nA) may benefit certain switching applications requiring reduced base drive requirements.

BC848B RFG and BC848C RFG from Taiwan Semiconductor Corporation maintain the 30 V breakdown voltage and 100 mA collector current with matching DC current gain (200 and 420 respectively). The reduced transition frequency (100 MHz) and power rating (200 mW) require circuit evaluation for frequency-dependent applications. BC848C variants feature elevated DC current gain (420) suitable for low-base-drive switching circuits.

BC848C-TP from Micro Commercial Co provides the same DC current gain elevation (420) as BC848C RFG with marginally higher power rating (225 mW) and maintains full SOT-23-3 package compatibility.

BC849BLT1G from onsemi is compatible with BC848B across all critical parameters except transition frequency (100 MHz versus 300 MHz) and power dissipation (300 mW versus 250 mW). This part carries ROHS3 compliance and MSL-1 moisture sensitivity rating.

BCW32,215 from Nexperia USA Inc. offers slightly elevated breakdown voltage (32 V versus 30 V) with automotive-grade qualification (AEC-Q101) and reduced saturation voltage (210 mV). This part is suitable for automotive applications requiring enhanced voltage margin and improved switching performance.

Frequently Asked Questions (FAQ)

Q: Can BC849B be used as a direct replacement for BC848B?

A: Yes. BC849B from Diotec Semiconductor is a parametric equivalent with identical electrical specifications: 100 mA collector current, 30 V breakdown voltage, 200 hFE minimum, 600 mV saturation voltage, 15 nA collector cutoff current, 250 mW power rating, and 300 MHz transition frequency. Both devices are packaged in SOT-23-3 and operate across -55°C to 150°C.

Q: What is the difference between BC848A and BC848B variants?

A: BC848A variants feature lower DC current gain (110 minimum versus 200 minimum for BC848B) and reduced transition frequency (100 MHz versus 300 MHz). BC848A also exhibits lower saturation voltage (500 mV versus 600 mV) and higher collector cutoff current (100 nA versus 15 nA). These differences make BC848A suitable for applications where lower base drive is beneficial, but unsuitable for high-frequency switching applications requiring 300 MHz performance.

Q: Are BC848C variants interchangeable with BC848B?

A: BC848C variants maintain package and voltage compatibility but feature significantly elevated DC current gain (420 minimum versus 200 minimum). The reduced transition frequency (100 MHz versus 300 MHz) and lower power rating (200 mW versus 250 mW) require circuit evaluation. BC848C is suitable for low-base-drive switching applications but not for circuits requiring 300 MHz frequency response.

Q: What is the significance of the RFG suffix in part numbers?

A: The RFG suffix indicates Taiwan Semiconductor Corporation as the manufacturer. These parts maintain electrical compatibility with Diotec Semiconductor equivalents but may differ in transition frequency and power dissipation specifications. RFG variants typically feature 100 MHz transition frequency compared to 300 MHz for Diotec parts.

Q: Can BCW32,215 replace BC848B in all applications?

A: BCW32,215 is compatible for most applications due to matching collector current (100 mA), DC current gain (200), and package form factor (SOT-23-3). However, the slightly elevated breakdown voltage (32 V versus 30 V), significantly reduced saturation voltage (210 mV versus 600 mV), and lower transition frequency (100 MHz versus 300 MHz) require circuit evaluation. BCW32,215 is automotive-qualified (AEC-Q101) and suitable for automotive applications where enhanced voltage margin is beneficial.

Q: What packaging options are available for BC848B substitutes?

A: All listed substitute parts are packaged in SOT-23-3 (TO-236-3, SC-59) surface mount configuration, maintaining mechanical compatibility with BC848B. Packaging variations include Tape & Reel (TR) for automated assembly and individual component formats. The SOT-23-3 package pinout remains consistent across all listed parts.

Q: How does transition frequency affect circuit performance?

A: Transition frequency (fT) determines the maximum frequency at which the transistor maintains useful gain. BC848B operates at 300 MHz, while most substitute parts operate at 100 MHz. For applications requiring switching speeds above 100 MHz or high-frequency amplification, BC848B or BC849B are required. For general-purpose switching and low-frequency amplification below 100 MHz, lower-frequency substitutes are acceptable.

Q: What is the impact of DC current gain (hFE) variation on circuit design?

A: DC current gain determines the base current required to achieve a specified collector current. BC848B requires minimum base current of 0.5 mA to achieve 100 mA collector current (hFE = 200). BC848A requires 0.91 mA base current (hFE = 110), while BC848C requires only 0.24 mA (hFE = 420). Lower hFE variants require higher base drive; higher hFE variants reduce base drive requirements. Circuit designs must account for these differences in base current calculations.

Q: Are there RoHS compliance differences between substitute parts?

A: BC848B from Diotec Semiconductor lists RoHS status as Not Applicable. Most substitute parts from Taiwan Semiconductor Corporation, Micro Commercial Co, onsemi, and Nexperia USA Inc. are ROHS3 Compliant. For applications requiring RoHS compliance certification, select substitute parts explicitly marked as ROHS3 Compliant.

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