BC846B Equivalent & Substitute Parts

Part Overview

The BC846B is an NPN bipolar junction transistor manufactured by onsemi in SOT-23-3 surface mount packaging. This device is classified as obsolete but remains in stock with 1,340,300 units available. The BC846B operates at maximum collector voltage of 65V with 100mA collector current capability and 200mW power dissipation. The part is designed for general-purpose switching and amplification applications in consumer and industrial electronics.

Equivalent and substitute parts are necessary due to the obsolete product status of the BC846B. Active alternatives from onsemi and other manufacturers provide improved specifications, enhanced compliance certifications, and guaranteed long-term availability. Substitutes maintain electrical compatibility while offering superior performance characteristics and manufacturing support.

Key Parameters

Parameter	BC846B (Main Part)	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	65	V
Current - Collector (Ic) (Max)	100	mA
Power - Max	200	mW
Frequency - Transition	100	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2mA, 5V	—
Operating Temperature Range	-65 to 150	°C
Package / Case	SOT-23-3	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitute parts for the BC846B are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes maintain all critical electrical parameters within the same operating envelope. These parts share identical collector voltage (65V), collector current (100mA), and NPN configuration. Direct substitutes include BC846BLT3G, SBC846BLT1G, BC846B,215, and BC846B-7-F. These parts are pin-compatible and functionally interchangeable in existing circuit designs.

Similar Substitutes provide equivalent functionality with variations in secondary parameters. BC846ALT1G and BC846ALT3G maintain 65V/100mA ratings but feature reduced DC current gain (110 vs. 200 minimum). SBC846ALT1G combines automotive qualification with reduced gain specifications. MMBT6429LT1G operates at lower voltage (45V) with higher current capability (200mA) and significantly higher transition frequency (700MHz), suitable for applications requiring enhanced speed performance.

Substitution logic is based on the following key parameters:

Transistor type (NPN configuration)
Collector-emitter breakdown voltage (65V maximum)
Maximum collector current (100mA)
Package compatibility (SOT-23-3)
Operating temperature range (-55°C to 150°C minimum)

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Power mW	hFE (Min)	Freq MHz	Temp °C	Status	Package
BC846B	onsemi	100	65	200	200	100	-65 to 150	Obsolete	SOT-23-3
BC846BLT3G	onsemi	100	65	300	200	100	-55 to 150	Active	SOT-23-3
SBC846BLT1G	onsemi	100	65	300	200	100	-55 to 150	Active	SOT-23-3
BC846ALT1G	onsemi	100	65	300	110	100	-55 to 150	Active	SOT-23-3
BC846ALT3G	onsemi	100	65	300	110	100	-55 to 150	Active	SOT-23-3
BC846BLT1G	onsemi	100	65	300	200	100	-55 to 150	Active	SOT-23-3
SBC846ALT1G	onsemi	100	65	300	110	100	-55 to 150	Active	SOT-23-3
BC846B,215	Nexperia USA Inc.	100	65	250	200	100	-55 to 150	Active	SOT-23-3
BC846B-7-F	Diodes Incorporated	100	65	300	200	300	-65 to 150	Active	SOT-23-3
MMBT6429LT1G	onsemi	200	45	225	500	700	-55 to 150	Active	SOT-23-3
2SC5866TLQ	Rohm Semiconductor	2000	60	500	120	200	-55 to 150	Active	TSMT3

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible, Electrically Equivalent):

BC846BLT3G and BC846BLT1G from onsemi are the primary direct substitutes. Both maintain identical electrical specifications to the BC846B with enhanced power dissipation (300mW vs. 200mW) and active product status. BC846BLT3G is available in Cut Tape & Digi-Reel packaging with 20,300 units in stock. BC846BLT1G is available in Cut Tape & Digi-Reel packaging with 305,200 units in stock. Both parts are RoHS3 compliant and REACH unaffected.

SBC846BLT1G provides automotive-grade qualification with AEC-Q101 certification, suitable for automotive and harsh environment applications. This part maintains identical electrical specifications with 95,400 units available in Tape & Reel packaging.

BC846B,215 from Nexperia USA Inc. is an active alternative with 66,300 units in stock. This part operates within the same electrical envelope with 250mW power rating and is RoHS3 compliant.

BC846B-7-F from Diodes Incorporated offers enhanced transition frequency (300MHz vs. 100MHz) while maintaining all other critical parameters. This part has the largest inventory (3,005,300 units) and supports the full operating temperature range (-65°C to 150°C) matching the original BC846B specification.

For Applications Requiring Enhanced Performance:

BC846ALT1G and BC846ALT3G provide active alternatives with reduced DC current gain (110 minimum vs. 200). These parts are suitable for applications where lower gain is acceptable. BC846ALT1G has 1,529,200 units available in Cut Tape & Digi-Reel packaging. BC846ALT3G has 25,400 units available in Tape & Reel packaging.

SBC846ALT1G combines automotive qualification with reduced gain specifications, available in Tape & Reel packaging with 71,300 units in stock.

MMBT6429LT1G is suitable only for applications where lower voltage (45V) and higher current (200mA) are acceptable, with significantly enhanced frequency response (700MHz). This part is not recommended as a direct substitute due to different voltage and current ratings.

2SC5866TLQ from Rohm Semiconductor is not recommended for BC846B substitution due to incompatible package (TSMT3 vs. SOT-23-3), significantly higher current rating (2A), and different electrical characteristics.

Frequently Asked Questions (FAQ)

Q: Can BC846BLT3G directly replace BC846B in existing designs?

A: Yes. BC846BLT3G maintains identical collector voltage (65V), collector current (100mA), DC current gain (200 minimum), and transition frequency (100MHz). The part is pin-compatible in SOT-23-3 packaging. Enhanced power dissipation (300mW vs. 200mW) provides additional design margin.

Q: What is the difference between BC846BLT1G and BC846BLT3G?

A: Both parts are electrically identical with identical specifications. The primary difference is packaging: BC846BLT3G is supplied in Cut Tape & Digi-Reel format, while BC846BLT1G is supplied in Cut Tape & Digi-Reel format. Inventory levels differ (305,200 vs. 20,300 units).

Q: Why should I select SBC846BLT1G over standard BC846BLT3G?

A: SBC846BLT1G includes automotive-grade qualification and AEC-Q101 certification. Select this part for automotive applications, industrial environments, or applications requiring enhanced reliability documentation. Electrical specifications are identical to BC846BLT3G.

Q: Can BC846ALT1G replace BC846B?

A: BC846ALT1G is electrically compatible with reduced DC current gain (110 minimum vs. 200 minimum). This part is suitable for applications where lower gain is acceptable or where the circuit design compensates for reduced gain through increased base current. Verify circuit performance before production implementation.

Q: Is BC846B-7-F from Diodes Incorporated a suitable substitute?

A: Yes. BC846B-7-F maintains all critical electrical parameters with enhanced transition frequency (300MHz vs. 100MHz). This part supports the full operating temperature range (-65°C to 150°C) and is RoHS3 compliant. The higher frequency capability provides additional performance margin for high-speed applications.

Q: Why is MMBT6429LT1G not recommended as a BC846B substitute?

A: MMBT6429LT1G operates at lower maximum voltage (45V vs. 65V) and higher collector current (200mA vs. 100mA). While packaged in SOT-23-3, the different electrical ratings make this part unsuitable for direct substitution. Use only in applications specifically designed for 45V/200mA operation.

Q: What is the difference between onsemi and Nexperia BC846B variants?

A: BC846B,215 from Nexperia USA Inc. maintains identical electrical specifications to onsemi BC846B with 250mW power rating. Both parts are RoHS3 compliant and pin-compatible. Selection between manufacturers depends on supply chain requirements and inventory availability.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed are RoHS3 compliant. The original BC846B (obsolete) does not specify RoHS status. All substitutes are REACH unaffected and carry EAR99 export classification.

Q: What packaging options are available for BC846B substitutes?

A: Substitute parts are available in Cut Tape & Digi-Reel (CT) and Tape & Reel (TR) packaging formats. All parts maintain SOT-23-3 (TO-236-3, SC-59) package compatibility. Select packaging based on production volume and assembly equipment requirements.

Q: Can I use BC846B-7-F in temperature-critical applications?

A: Yes. BC846B-7-F supports the full operating temperature range (-65°C to 150°C), matching the original BC846B specification. This part is suitable for military, aerospace, and extreme environment applications requiring extended temperature operation.

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