BC856A Equivalent & Substitute Parts

Part Overview

The BC856A is an active PNP bipolar junction transistor (BJT) manufactured by Taiwan Semiconductor Corporation in SOT-23 surface mount packaging. This device operates at maximum collector current of 100 mA, collector-emitter breakdown voltage of 65 V, and maximum power dissipation of 200 mW. The BC856A is suitable for general-purpose switching and amplification applications in consumer and industrial electronics.

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required, or when sourcing from multiple manufacturers is needed to ensure supply chain continuity. The parts listed below maintain electrical compatibility within the BC856 device family while offering variations in packaging, power rating, and frequency characteristics.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	100	mA
Voltage - Collector Emitter Breakdown (Max)	65	V
Vce Saturation (Max) @ Ib, Ic	650 mV @ 5 mA, 100 mA	—
Current - Collector Cutoff (Max)	100 nA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	125 @ 2 mA, 5 V	—
Power - Max	200	mW
Frequency - Transition	100	MHz
Operating Temperature	-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 within the BC856 family is determined by the following core electrical parameters: PNP transistor type, maximum collector current (100 mA), collector-emitter breakdown voltage (65 V), saturation voltage (650 mV @ 5 mA, 100 mA), and DC current gain minimum (125 @ 2 mA, 5 V). All substitute parts maintain these critical specifications.

Variations among substitute parts occur in the following areas:

Power Dissipation: The BC856A is rated at 200 mW maximum power. Substitute parts BC856A-7-F, BC856ALT1G, BC856BLT1G, and BC856BLT3G are rated at 300 mW, providing higher thermal headroom. BC856B,235 is rated at 250 mW.

Transition Frequency: The BC856A operates at 100 MHz. BC856A-7-F operates at 200 MHz, offering enhanced high-frequency performance.

DC Current Gain: The BC856A specifies minimum hFE of 125 @ 2 mA, 5 V. BC856B variants (BC856B,235, BC856BLT1G, BC856BLT3G) specify minimum hFE of 220 @ 2 mA, 5 V, indicating tighter gain control.

Collector Cutoff Current: The BC856A specifies maximum ICBO of 100 nA. All substitute parts specify 15 nA, representing lower leakage current.

Packaging Format: BC856A RFG is supplied in Tape & Reel format. BC856A-7-F is supplied in Tape & Reel. BC856ALT1G and BC856BLT1G are supplied in Cut Tape & Digi-Reel format. BC856BLT3G is supplied in Tape & Reel.

Manufacturer Variants: BC856A RFG is Taiwan Semiconductor Corporation. BC856A-7-F is Diodes Incorporated. BC856ALT1G, BC856BLT1G, and BC856BLT3G are onsemi. BC856B,235 is NXP USA Inc. (Nexperia).

All parts are RoHS3 compliant and REACH unaffected. All parts maintain SOT-23 surface mount packaging compatibility.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Vce Sat (Max)	hFE (Min)	Power (Max)	Frequency	Temp Range	ICBO (Max)	Packaging
BC856A	Taiwan Semiconductor	100 mA	65 V	650 mV	125	200 mW	100 MHz	-55 to 150°C	100 nA	SOT-23
BC856A RFG	Taiwan Semiconductor	100 mA	65 V	650 mV	125	200 mW	100 MHz	-55 to 150°C	100 nA	Tape & Reel
BC856A-7-F	Diodes Incorporated	100 mA	65 V	650 mV	125	300 mW	200 MHz	-65 to 150°C	15 nA	Tape & Reel
BC856ALT1G	onsemi	100 mA	65 V	650 mV	125	300 mW	100 MHz	-55 to 150°C	15 nA	Cut Tape & Digi-Reel
BC856B,235	NXP USA Inc.	100 mA	65 V	650 mV	220	250 mW	100 MHz	-55 to 150°C	15 nA	SOT-23
BC856BLT1G	onsemi	100 mA	65 V	650 mV	220	300 mW	100 MHz	-55 to 150°C	15 nA	Cut Tape & Digi-Reel
BC856BLT3G	onsemi	100 mA	65 V	650 mV	220	300 mW	100 MHz	-55 to 150°C	15 nA	Tape & Reel

Engineering Selection Recommendations

BC856A RFG (Taiwan Semiconductor Corporation): Direct parametric equivalent to BC856A with identical electrical specifications. Differs only in packaging format (Tape & Reel). Suitable for high-volume production requiring reel-based component handling. Active product status with RoHS3 compliance.

BC856A-7-F (Diodes Incorporated): Maintains core electrical compatibility with enhanced specifications. Provides 300 mW power rating (versus 200 mW) and 200 MHz transition frequency (versus 100 MHz), enabling operation in higher-frequency applications with greater thermal margin. Extended operating temperature range to -65°C. Lower collector cutoff current (15 nA versus 100 nA). Active product status with RoHS3 compliance. Suitable for applications requiring improved high-frequency performance or enhanced thermal headroom.

BC856ALT1G (onsemi): Maintains BC856A electrical specifications with 300 mW power rating and lower collector cutoff current (15 nA). Supplied in Cut Tape & Digi-Reel format. Active product status with RoHS3 compliance and MSL 1 rating. Suitable for applications requiring alternative packaging or onsemi device sourcing.

BC856B,235 (NXP USA Inc. / Nexperia): BC856B variant with higher DC current gain (220 versus 125 minimum). Maintains 100 MHz transition frequency and 250 mW power rating. Automotive grade with AEC-Q101 qualification. Suitable for automotive applications or where higher current gain is beneficial. Active product status.

BC856BLT1G (onsemi): BC856B variant with higher DC current gain (220 minimum) and 300 mW power rating. Supplied in Cut Tape & Digi-Reel format. Active product status with RoHS3 compliance and MSL 1 rating. Highest inventory availability (1,495,300 pcs). Suitable for high-volume production with onsemi sourcing preference.

BC856BLT3G (onsemi): BC856B variant with higher DC current gain (220 minimum) and 300 mW power rating. Supplied in Tape & Reel format. Active product status with RoHS3 compliance and MSL 1 rating. Suitable for reel-based production with onsemi sourcing and BC856B specifications.

Frequently Asked Questions (FAQ)

Q: Can BC856A be directly replaced with BC856A RFG?

A: Yes. BC856A RFG is a parametric equivalent with identical electrical specifications. The only difference is packaging format (Tape & Reel versus bulk). Both are Taiwan Semiconductor Corporation products with identical performance characteristics.

Q: What is the difference between BC856A and BC856B variants?

A: The primary difference is DC current gain. BC856A specifies minimum hFE of 125 @ 2 mA, 5 V. BC856B variants specify minimum hFE of 220 @ 2 mA, 5 V. All other core electrical parameters (Ic, Vce breakdown, saturation voltage) remain identical. BC856B provides tighter gain control and higher current amplification.

Q: Can BC856A-7-F replace BC856A in all applications?

A: BC856A-7-F maintains all core electrical specifications required for BC856A compatibility. However, BC856A-7-F offers enhanced specifications: 300 mW power (versus 200 mW), 200 MHz transition frequency (versus 100 MHz), and lower collector cutoff current (15 nA versus 100 nA). These enhancements are backward compatible and do not create functional incompatibility. BC856A-7-F is suitable as a direct replacement with performance advantages.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 indicates Moisture Sensitivity Level 1, which means unlimited shelf life without moisture control requirements. Components with MSL 1 do not require special moisture-barrier packaging or baking procedures prior to soldering. This simplifies handling and storage compared to higher MSL ratings.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected. All parts are suitable for applications requiring RoHS compliance.

Q: Which substitute part has the lowest leakage current?

A: All substitute parts except BC856A RFG specify maximum collector cutoff current (ICBO) of 15 nA. BC856A and BC856A RFG specify 100 nA. Lower leakage current reduces standby power consumption and improves circuit performance in low-power applications.

Q: Is BC856B,235 suitable for automotive applications?

A: Yes. BC856B,235 is automotive grade with AEC-Q101 qualification. This part is specifically qualified for automotive use and meets automotive reliability and quality standards.

Q: What is the difference between Cut Tape & Digi-Reel and Tape & Reel packaging?

A: Both are reel-based formats suitable for automated assembly. Tape & Reel is standard reel packaging. Cut Tape & Digi-Reel is a format that combines cut tape with Digi-Reel carrier for flexible handling. Both formats are compatible with standard pick-and-place equipment. Selection depends on production line equipment compatibility and inventory management preferences.

Q: Can BC856BLT1G replace BC856A in high-volume production?

A: Yes. BC856BLT1G maintains all core BC856A electrical specifications with enhancements: higher DC current gain (220 versus 125), 300 mW power rating (versus 200 mW), and lower leakage current (15 nA versus 100 nA). BC856BLT1G has the highest inventory availability (1,495,300 pcs) among all substitute parts, making it suitable for high-volume production with onsemi sourcing.

Q: What is the operating temperature range difference between BC856A and BC856A-7-F?

A: BC856A operates from -55°C to 150°C. BC856A-7-F operates from -65°C to 150°C. BC856A-7-F provides extended low-temperature operation capability, suitable for applications requiring operation in colder environments.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message