BC856B Equivalent & Substitute Parts

Part Overview

The BC856B is an active PNP bipolar junction transistor (BJT) manufactured by Taiwan Semiconductor Corporation. This surface mount device is specified for general-purpose switching and amplification applications in the -55°C to 150°C operating temperature range. The BC856B is housed in a SOT-23 package and is ROHS3 compliant and REACH unaffected. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part number becomes unavailable or when alternative packaging formats are required.

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	650mV @ 5mA, 100mA	mV
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	220 @ 2mA, 5V	—
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 of the BC856B is determined by electrical and mechanical parameter equivalence within the PNP bipolar transistor category. The critical parameters that define substitutability are:

Transistor Type: PNP configuration
Maximum Collector Current (Ic): 100 mA
Collector-Emitter Breakdown Voltage: 65 V
Saturation Voltage (Vce): 650 mV @ specified base and collector currents
DC Current Gain (hFE): Minimum 220 @ 2mA, 5V
Transition Frequency: 100 MHz
Power Dissipation: 200 mW or greater
Operating Temperature Range: -55°C to 150°C
Package Type: SOT-23 surface mount
Compliance: ROHS3 and REACH unaffected status

Substitute parts are grouped into two categories:

Parametric Equivalent: BC856B RFG maintains identical electrical specifications and differs only in packaging format (Tape & Reel versus bulk).

Similar Manufacturer Parts: BC856ALT1G and BC856BLT1G are manufactured by onsemi and provide equivalent or superior electrical performance with enhanced power dissipation capability (300 mW versus 200 mW) and improved collector cutoff current specifications.

Parameter Comparison

Parameter	BC856B	BC856B RFG	BC856ALT1G	BC856BLT1G
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	onsemi	onsemi
Transistor Type	PNP	PNP	PNP	PNP
Current - Collector (Ic) (Max)	100 mA	100 mA	100 mA	100 mA
Voltage - Collector Emitter Breakdown (Max)	65 V	65 V	65 V	65 V
Vce Saturation (Max) @ Ib, Ic	650mV @ 5mA, 100mA	650mV @ 5mA, 100mA	650mV @ 5mA, 100mA	650mV @ 5mA, 100mA
Current - Collector Cutoff (Max)	100 nA	100 nA	15 nA	15 nA
DC Current Gain (hFE) (Min) @ Ic, Vce	220 @ 2mA, 5V	220 @ 2mA, 5V	125 @ 2mA, 5V	220 @ 2mA, 5V
Power - Max	200 mW	200 mW	300 mW	300 mW
Frequency - Transition	100 MHz	100 MHz	100 MHz	100 MHz
Operating Temperature	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Packaging Format	Bulk	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

BC856B RFG is the direct parametric equivalent to the BC856B. This part maintains identical electrical specifications and is manufactured by the same supplier. The distinction is packaging format: BC856B RFG is supplied in Tape & Reel format, while the BC856B is supplied in bulk. Selection of BC856B RFG is appropriate for high-volume production environments where automated tape-fed assembly is employed.

BC856ALT1G and BC856BLT1G are manufactured by onsemi and provide enhanced performance characteristics. Both parts meet or exceed the electrical requirements of the BC856B. BC856ALT1G specifies a minimum DC current gain (hFE) of 125 @ 2mA, 5V, which is lower than the BC856B specification of 220. BC856BLT1G maintains the hFE specification at 220 @ 2mA, 5V, matching the BC856B. Both onsemi parts offer increased power dissipation capability (300 mW versus 200 mW) and improved collector cutoff current performance (15 nA versus 100 nA). All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the primary part.

Frequently Asked Questions (FAQ)

Q: Can BC856B RFG be used as a direct replacement for BC856B?

A: Yes. BC856B RFG is a parametric equivalent with identical electrical specifications. The only difference is packaging format: BC856B RFG is supplied in Tape & Reel format for automated assembly, while BC856B is supplied in bulk. Both parts are manufactured by Taiwan Semiconductor Corporation and are electrically interchangeable.

Q: What are the differences between BC856ALT1G and BC856BLT1G?

A: Both parts are manufactured by onsemi and provide enhanced performance compared to the BC856B. The primary difference is DC current gain specification: BC856ALT1G specifies a minimum hFE of 125 @ 2mA, 5V, while BC856BLT1G specifies 220 @ 2mA, 5V. BC856BLT1G matches the BC856B hFE specification exactly. Both parts offer superior power dissipation (300 mW) and improved collector cutoff current (15 nA).

Q: Are all substitute parts available in the same SOT-23 package?

A: Yes. All listed substitute parts are housed in the SOT-23 package (TO-236-3, SC-59, SOT-23-3). Pin configuration and physical dimensions are identical across all parts, enabling direct board-level substitution without layout modification.

Q: Do the substitute parts maintain the same operating temperature range?

A: Yes. All substitute parts operate across the -55°C to 150°C temperature range, matching the BC856B specification. This ensures thermal performance equivalence across all environmental conditions.

Q: Are all substitute parts ROHS3 compliant and REACH unaffected?

A: Yes. BC856B RFG, BC856ALT1G, and BC856BLT1G are all ROHS3 compliant and REACH unaffected, maintaining regulatory alignment with the primary BC856B part.

Q: What is the significance of the improved collector cutoff current (ICBO) in the onsemi parts?

A: The onsemi parts (BC856ALT1G and BC856BLT1G) specify a maximum collector cutoff current of 15 nA, compared to 100 nA for the BC856B. Lower collector cutoff current indicates reduced leakage current in the off state, which can improve circuit performance in low-power or high-impedance applications. This represents an enhancement over the BC856B specification.

Q: Can BC856ALT1G be used in applications requiring the full 220 hFE specification?

A: BC856ALT1G specifies a minimum hFE of 125 @ 2mA, 5V, which is lower than the BC856B requirement of 220. Applications with strict hFE requirements should use BC856BLT1G, which maintains the 220 hFE specification. BC856ALT1G is suitable for applications where hFE ≥ 125 is acceptable.

Q: What packaging formats are available for each substitute part?

A: BC856B RFG is supplied in Tape & Reel (TR) format. BC856ALT1G and BC856BLT1G are supplied in Cut Tape (CT) & Digi-Reel® format. The BC856B is supplied in bulk. Selection depends on assembly process requirements and volume considerations.

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