BC848ALT1 Equivalent & Substitute Parts

Part Overview

The BC848ALT1 is an NPN bipolar junction transistor manufactured by onsemi, rated for 30V collector-emitter breakdown voltage and 100mA maximum collector current in a SOT-23 surface mount package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. The BC848ALT1 serves as a general-purpose small-signal switching and amplification transistor in consumer and industrial applications.

Key Parameters

Parameter	BC848ALT1 Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	30 V
Current - Collector (Ic) (Max)	100 mA
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BC848ALT1 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Transistor Type: NPN (mandatory match)
Voltage - Collector Emitter Breakdown (Max): 30V minimum
Current - Collector (Ic) (Max): 100mA minimum
DC Current Gain (hFE): 110 minimum @ 2mA, 5V

Mechanical Compatibility Requirements:

Package / Case: TO-236-3, SC-59, or SOT-23-3 (pin-compatible)
Mounting Type: Surface Mount

Compliance Requirements:

RoHS Status: ROHS3 Compliant preferred for new designs
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts meeting these criteria are grouped into two categories: direct equivalents from onsemi (BC848ALT1G) and functionally compatible alternatives from other manufacturers that maintain electrical and mechanical compatibility within the specified parameter ranges.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max)	Vce Breakdown (Max)	hFE (Min) @ Ic, Vce	Power (Max)	Frequency - Transition	Package	RoHS Status
BC848ALT1	onsemi	Obsolete	100 mA	30 V	Not specified	Not specified	Not specified	SOT-23-3	RoHS non-compliant
BC848ALT1G	onsemi	Active	100 mA	30 V	110 @ 2mA, 5V	300 mW	100 MHz	SOT-23-3	ROHS3 Compliant
BC848A-TP	Micro Commercial Co	Active	100 mA	30 V	110 @ 2mA, 5V	225 mW	100 MHz	SOT-23-3	ROHS3 Compliant
BC848AE6327HTSA1	Infineon Technologies	Obsolete	100 mA	30 V	110 @ 2mA, 5V	330 mW	250 MHz	SOT-23-3	ROHS3 Compliant
BC848B RFG	Taiwan Semiconductor Corporation	Active	100 mA	30 V	200 @ 2mA, 5V	200 mW	100 MHz	SOT-23-3	ROHS3 Compliant
BC848C RFG	Taiwan Semiconductor Corporation	Active	100 mA	30 V	420 @ 2mA, 5V	200 mW	100 MHz	SOT-23-3	ROHS3 Compliant
BC849C,235	Nexperia USA Inc.	Active	100 mA	30 V	420 @ 2mA, 5V	250 mW	100 MHz	SOT-23-3	ROHS3 Compliant
BC849C-TP	Micro Commercial Co	Active	100 mA	30 V	420 @ 2mA, 5V	225 mW	100 MHz	SOT-23-3	ROHS3 Compliant
BSR17A	onsemi	Active	200 mA	40 V	100 @ 10mA, 1V	350 mW	300 MHz	SOT-23-3	ROHS3 Compliant
BCW31,215	NXP USA Inc.	Active	100 mA	32 V	110 @ 2mA, 5V	250 mW	100 MHz	SOT-23-3	Not specified
BCW32,215	Nexperia USA Inc.	Active	100 mA	32 V	200 @ 2mA, 5V	250 mW	100 MHz	SOT-23-3	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: BC848ALT1G

The BC848ALT1G from onsemi is the direct active equivalent of the BC848ALT1. It maintains identical electrical specifications (30V Vce breakdown, 100mA Ic, 110 hFE minimum) and mechanical compatibility (SOT-23-3 package). The BC848ALT1G carries ROHS3 compliance, addressing the RoHS non-compliance status of the obsolete BC848ALT1. This part is recommended for direct replacement in new designs and production transitions.

Secondary Recommendations for Equivalent Performance:

BC848A-TP (Micro Commercial Co) and BC849C-TP (Micro Commercial Co) provide equivalent electrical performance with ROHS3 compliance. Both maintain the 30V/100mA ratings and SOT-23-3 package compatibility. These parts are suitable where manufacturer diversification is required.

BC848B RFG and BC848C RFG (Taiwan Semiconductor Corporation) offer active product status with ROHS3 compliance. The BC848C RFG provides higher DC current gain (420 hFE) compared to the BC848ALT1 specification, suitable for applications requiring enhanced gain characteristics.

Automotive-Grade Alternative:

BC849C,235 (Nexperia USA Inc.) is AEC-Q101 qualified and carries automotive-grade designation. This part maintains 30V/100mA electrical specifications with ROHS3 compliance and is appropriate for automotive and industrial applications requiring qualification documentation.

Higher Performance Alternative:

BSR17A (onsemi) exceeds the BC848ALT1 specifications with 40V Vce breakdown, 200mA Ic maximum, and 300MHz transition frequency. This part is suitable for applications requiring enhanced voltage and current handling or higher-frequency operation, while maintaining SOT-23-3 package compatibility and ROHS3 compliance.

Compliance Consideration:

All recommended active substitutes carry ROHS3 compliance, addressing the RoHS non-compliance status of the obsolete BC848ALT1. For applications requiring RoHS compliance certification, selection from the active substitute list is mandatory.

Frequently Asked Questions (FAQ)

Q: Can BC848ALT1G directly replace BC848ALT1 without circuit modification?

A: Yes. The BC848ALT1G maintains identical electrical ratings (30V Vce breakdown, 100mA Ic, 110 hFE minimum @ 2mA, 5V) and mechanical compatibility (SOT-23-3 package). No circuit modifications are required for direct substitution.

Q: What is the primary difference between BC848 and BC849 series transistors?

A: The BC849 series exhibits higher DC current gain (hFE) specifications. BC849C-TP specifies 420 hFE minimum @ 2mA, 5V, compared to 110 hFE minimum for BC848A variants. Both maintain identical voltage and current ratings (30V, 100mA) and SOT-23-3 package compatibility. Selection depends on gain requirements for the specific application.

Q: Are BCW31,215 and BCW32,215 suitable replacements for BC848ALT1?

A: BCW31,215 and BCW32,215 are functionally compatible substitutes with slightly elevated voltage ratings (32V Vce breakdown versus 30V). Both maintain 100mA Ic maximum and SOT-23-3 package compatibility. These parts are suitable for applications where the additional voltage margin is beneficial. BCW32,215 carries ROHS3 compliance; BCW31,215 RoHS status is not specified.

Q: When should BSR17A be selected instead of BC848ALT1 equivalents?

A: BSR17A is selected when application requirements exceed BC848ALT1 specifications. BSR17A provides 40V Vce breakdown (versus 30V), 200mA Ic maximum (versus 100mA), and 300MHz transition frequency (versus 100MHz). Applications requiring higher voltage headroom, increased current capacity, or higher-frequency operation benefit from BSR17A selection. SOT-23-3 package compatibility is maintained.

Q: What packaging options are available for BC848 equivalents?

A: BC848 equivalents are available in Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), and Bulk packaging formats. BC848ALT1G is supplied in Cut Tape & Digi-Reel format. BC848A-TP and BC849C-TP are supplied in Tape & Reel format. Packaging selection depends on production volume and assembly requirements. All variants maintain SOT-23-3 mechanical compatibility.

Q: Is RoHS compliance mandatory for BC848ALT1 replacement?

A: For new designs and production transitions, ROHS3 compliance is strongly indicated. The BC848ALT1 is RoHS non-compliant. All recommended active substitutes (BC848ALT1G, BC848A-TP, BC849C-TP, BC848B RFG, BC848C RFG, BC849C,235, BSR17A, BCW32,215) carry ROHS3 compliance. Regulatory requirements and customer specifications determine whether RoHS compliance is mandatory for specific applications.

Q: Can BC848ALT1 be used in new production if inventory remains available?

A: The BC848ALT1 is classified as obsolete. While existing inventory may be available, new production should transition to active equivalents to ensure long-term supply continuity and compliance with current regulatory standards. BC848ALT1G is the recommended direct replacement for production continuity.

Q: What is the significance of the hFE (DC Current Gain) variation among BC848 variants?

A: DC current gain variation affects transistor amplification characteristics. BC848A variants specify 110 hFE minimum, BC848B variants specify 200 hFE minimum, and BC848C variants specify 420 hFE minimum. Higher hFE values reduce base current requirements for a given collector current, affecting circuit biasing and power consumption. Application circuit design determines whether hFE variation is acceptable or requires specific selection.

Q: Are all substitute parts qualified for the same operating temperature range?

A: Most active substitutes specify -55°C to 150°C operating temperature range. BC849C,235 and BCW31,215 specify maximum operating temperature of 150°C without lower limit specification. Verify operating temperature specifications for specific application requirements, particularly for extreme temperature environments.

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