BC856ALT3G Equivalent & Substitute Parts

Part Overview

The BC856ALT3G is a PNP bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device operates at 65 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and 300 mW power dissipation in a surface-mount SOT-23-3 package. The BC856ALT3G is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Active alternatives from multiple manufacturers provide identical or enhanced electrical performance while maintaining mechanical compatibility.

Key Parameters

Parameter	BC856ALT3G Value	Unit
Transistor Type	PNP	—
Collector-Emitter Breakdown Voltage (Max)	65	V
Collector Current (Max)	100	mA
Power Dissipation (Max)	300	mW
Transition Frequency	100	MHz
DC Current Gain (hFE Min) @ Ic, Vce	125 @ 2mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	650mV @ 5mA, 100mA	—
Collector Cutoff Current (Max)	15	nA
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-23-3 (TO-236)	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BC856ALT3G is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

Transistor polarity: PNP
Collector-emitter breakdown voltage: 65 V (minimum)
Maximum collector current: 100 mA (minimum)
Package type: SOT-23-3 / TO-236 / TO-236AB (mechanically compatible)
Mounting type: Surface mount
DC current gain (hFE): minimum 125 @ 2mA, 5V
Vce saturation: 650mV @ 5mA, 100mA
Collector cutoff current: 15nA (maximum)

Allowable Variations:

Power dissipation: 250 mW to 310 mW (all exceed or meet 300 mW minimum)
Transition frequency: 100 MHz to 200 MHz (higher frequencies are acceptable)
Operating temperature range: -65°C to -55°C minimum; 150°C maximum (all meet or exceed)
DC current gain (hFE): 125 to 220 @ 2mA, 5V (higher gains acceptable)
Product status: Active substitutes preferred over obsolete
Compliance: RoHS3, REACH, AEC-Q101 certifications enhance suitability

Substitute parts are grouped by manufacturer and packaging configuration. All listed substitutes maintain full electrical and mechanical compatibility with the BC856ALT3G within the specified parameter ranges.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Power mW	fT MHz	hFE Min @ 2mA, 5V	Temp Range °C	Package	Status
BC856ALT3G	onsemi	100	65	300	100	125	-55 to 150	SOT-23-3	Obsolete
BC856ALT1G	onsemi	100	65	300	100	125	-55 to 150	SOT-23-3	Active
SBC856ALT1G	onsemi	100	65	300	100	125	-55 to 150	SOT-23-3	Active
BC856,215	Nexperia USA Inc.	100	65	250	100	125	-40 to 150	TO-236AB	Active
BC856A,215	Nexperia USA Inc.	100	65	250	100	125	-40 to 150	TO-236AB	Active
BC856A-7-F	Diodes Incorporated	100	65	300	200	125	-65 to 150	SOT-23-3	Active
BC856A-TP	Micro Commercial Co	100	65	310	200	125	-55 to 150	SOT-23	Active
BC856A-HF	Comchip Technology	100	65	250	100	125	-65 to 150	SOT-23-3	Active
BC856B,215	Nexperia USA Inc.	100	65	250	100	220	-40 to 150	TO-236AB	Active
BC856B,235	NXP USA Inc.	100	65	250	100	220	-40 to 150	SOT-23	Active
BC856B-7-F	Diodes Incorporated	100	65	300	200	220	-65 to 150	SOT-23-3	Active

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Specifications):

BC856ALT1G (onsemi) is the primary direct replacement for BC856ALT3G. Both parts share identical electrical parameters, transition frequency, and operating temperature range. BC856ALT1G is active and available in high volume (68,400 units in stock), providing immediate procurement continuity. Packaging differs only in configuration (Cut Tape & Digi-Reel vs. standard SOT-23-3), with no impact on circuit performance.

Automotive-Grade Alternatives:

SBC856ALT1G (onsemi) and BC856,215 / BC856A,215 (Nexperia USA Inc.) are AEC-Q101 qualified automotive-grade devices. These parts maintain full electrical equivalence while providing enhanced reliability documentation suitable for automotive and industrial applications. SBC856ALT1G carries the automotive designation in its part number and is RoHS3 compliant.

Enhanced Performance Substitutes:

BC856A-7-F (Diodes Incorporated) and BC856A-TP (Micro Commercial Co) offer doubled transition frequency (200 MHz vs. 100 MHz) while maintaining all other electrical parameters. These parts are suitable for applications requiring higher-speed switching performance. BC856A-7-F extends the operating temperature range to -65°C, providing enhanced low-temperature performance.

Higher Gain Variants:

BC856B series parts (BC856B,215, BC856B,235, BC856B-7-F) feature doubled DC current gain (hFE minimum 220 vs. 125). These variants are direct substitutes for applications where higher current gain is beneficial or required. BC856B-7-F combines higher gain with 200 MHz transition frequency and extended temperature range.

Selection Criteria:

Standard replacement: BC856ALT1G (onsemi)
Automotive applications: SBC856ALT1G (onsemi) or BC856,215 (Nexperia)
High-speed applications: BC856A-7-F (Diodes Incorporated)
Higher gain requirement: BC856B-7-F (Diodes Incorporated)
Extended temperature range: BC856A-7-F or BC856B-7-F (both -65°C minimum)

All recommended substitutes are active products with RoHS3 compliance and REACH compliance status.

Frequently Asked Questions (FAQ)

Q: Can BC856ALT1G be used as a direct replacement for BC856ALT3G?

A: Yes. BC856ALT1G is electrically and mechanically identical to BC856ALT3G. Both are PNP transistors with 65 V breakdown voltage, 100 mA maximum collector current, 300 mW power dissipation, and 100 MHz transition frequency. The primary difference is product status: BC856ALT1G is active while BC856ALT3G is obsolete. Packaging configuration differs (Cut Tape & Digi-Reel vs. standard), but this does not affect circuit performance.

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

A: The primary difference is DC current gain (hFE). BC856A variants specify a minimum hFE of 125 @ 2mA, 5V, while BC856B variants specify a minimum hFE of 220 @ 2mA, 5V. All other electrical parameters remain identical. BC856B is suitable for applications requiring higher current gain or where lower base drive current is desired.

Q: Are Nexperia BC856,215 and BC856A,215 suitable replacements?

A: Yes, with one consideration. Both parts are electrically equivalent to BC856ALT3G across all critical parameters. However, the operating temperature range is specified as -40°C to 150°C (vs. -55°C to 150°C for BC856ALT3G). These parts are suitable for applications operating above -40°C. Both are AEC-Q101 qualified automotive-grade devices.

Q: What is the advantage of BC856A-7-F over BC856ALT1G?

A: BC856A-7-F offers two enhancements: (1) doubled transition frequency (200 MHz vs. 100 MHz), enabling faster switching applications, and (2) extended low-temperature operating range (-65°C vs. -55°C minimum). All other electrical parameters are identical. BC856A-7-F is manufactured by Diodes Incorporated and is RoHS3 compliant.

Q: Can I use BC856B-7-F in place of BC856ALT3G?

A: Yes. BC856B-7-F is a full substitute with enhanced specifications: higher DC current gain (220 vs. 125), doubled transition frequency (200 MHz vs. 100 MHz), and extended temperature range (-65°C to 150°C). These enhancements make BC856B-7-F suitable for all applications designed for BC856ALT3G, with improved performance margins.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed are RoHS3 compliant and REACH compliant. The obsolete BC856ALT3G does not specify RoHS status. All substitutes meet current environmental and regulatory requirements.

Q: What packaging options are available?

A: All substitute parts use surface-mount packages compatible with BC856ALT3G: SOT-23-3, TO-236, TO-236AB, or SC-59 (all mechanically equivalent). Packaging configurations vary by manufacturer and supplier (Cut Tape, Digi-Reel, Tape & Reel), but the physical component package remains identical. Verify packaging configuration with your supplier for pick-and-place equipment compatibility.

Q: Which substitute offers the best overall compatibility?

A: BC856ALT1G (onsemi) provides the best direct compatibility, matching all electrical and thermal specifications of BC856ALT3G while being an active product. For automotive applications, SBC856ALT1G (onsemi) is recommended due to AEC-Q101 qualification. For applications requiring enhanced performance, BC856A-7-F or BC856B-7-F provide higher transition frequency and extended temperature range.

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