BC860AMTF Equivalent & Substitute Parts

Part Overview

The BC860AMTF is a PNP bipolar junction transistor manufactured by onsemi, housed in a SOT-23-3 surface mount package. This component is classified as obsolete, though 45,400 units remain in stock. The BC860AMTF is designed for general-purpose switching and amplification applications requiring a 45 V collector-emitter breakdown voltage and 100 mA maximum collector current. Due to its obsolete status, equivalent and substitute parts with active product status are necessary for new designs and long-term supply chain continuity.

Key Parameters

Parameter	BC860AMTF Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	45	V
Current - Collector (Ic) (Max)	100	mA
Vce Saturation (Max) @ Ib, Ic	650 mV @ 5 mA, 100 mA	—
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	110 @ 2 mA, 5 V	—
Power - Max	310	mW
Frequency - Transition	150	MHz
Package / Case	SOT-23-3	—
Mounting Type	Surface Mount	—
Operating Temperature (Max)	150	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BC860AMTF is determined by the following critical parameters:

Mandatory Matching Parameters:

Transistor Type: PNP
Package / Case: SOT-23-3 (TO-236-3, SC-59)
Mounting Type: Surface Mount
Voltage - Collector Emitter Breakdown (Max): ≥ 45 V
Current - Collector (Max): ≥ 100 mA
Vce Saturation (Max) @ Ib, Ic: ≤ 650 mV @ 5 mA, 100 mA
Current - Collector Cutoff (Max): ≤ 15 nA
Power - Max: ≥ 310 mW
Operating Temperature (Max): ≥ 150 °C

Flexible Parameters (May Exceed Specification):

DC Current Gain (hFE): May be higher than 110
Frequency - Transition: May be lower or higher than 150 MHz
Product Status: Active status preferred for new designs

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (100 mA Current Rating): BC857ALT1G, BC857BLT1G, BC857CLT1G, BC857CLT3G, BCW70LT1G

These parts maintain the 100 mA collector current specification and identical saturation voltage characteristics, providing direct functional replacement.

Category B - Higher Current Capability (500 mA Current Rating): BC807-16LT1G, BC807-40LT1G, BC807-40LT3G

These parts exceed the current specification with 500 mA capability, suitable for applications requiring additional current headroom while maintaining voltage and package compatibility.

Category C - Higher Current Capability (200 mA Current Rating): MMBT3906LT1G, MMBT3906LT3G

These parts provide 200 mA capability with enhanced frequency performance (250 MHz), though with reduced voltage rating (40 V instead of 45 V).

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce Breakdown (Max) V	Vce Sat (Max) mV	hFE (Min)	Power (Max) mW	Freq (MHz)	Temp (Max) °C	Package	RoHS
BC860AMTF	onsemi	Obsolete	100	45	650	110	310	150	150	SOT-23-3	—
BC857ALT1G	onsemi	Active	100	45	650	125	300	100	150	SOT-23-3	ROHS3
BC857BLT1G	onsemi	Active	100	45	650	220	300	100	150	SOT-23-3	ROHS3
BC857CLT1G	onsemi	Active	100	45	650	420	300	100	150	SOT-23-3	ROHS3
BC857CLT3G	onsemi	Active	100	45	650	420	300	100	150	SOT-23-3	ROHS3
BCW70LT1G	onsemi	Active	100	45	300	215	225	—	150	SOT-23-3	ROHS3
BC807-16LT1G	onsemi	Active	500	45	700	100	300	100	150	SOT-23-3	ROHS3
BC807-40LT1G	onsemi	Active	500	45	700	250	300	100	150	SOT-23-3	ROHS3
BC807-40LT3G	onsemi	Active	500	45	700	250	300	100	150	SOT-23-3	ROHS3
MMBT3906LT1G	onsemi	Active	200	40	400	100	300	250	150	SOT-23-3	ROHS3
MMBT3906LT3G	onsemi	Active	200	40	400	100	300	250	150	SOT-23-3	ROHS3

Engineering Selection Recommendations

For Direct Replacement (100 mA Applications):

BC857ALT1G, BC857BLT1G, and BC857CLT1G are recommended as primary substitutes. All three maintain the 100 mA collector current specification, 45 V breakdown voltage, and identical saturation voltage characteristics. These parts carry Active product status and ROHS3 compliance, ensuring long-term availability and regulatory conformance. The BC857 series variants differ only in DC current gain (hFE), with BC857ALT1G providing the closest match to the original BC860AMTF specification at 125 hFE minimum.

For Applications Requiring Enhanced Current Capability:

BC807-16LT1G, BC807-40LT1G, and BC807-40LT3G provide 500 mA maximum collector current while maintaining 45 V breakdown voltage and SOT-23-3 packaging. These parts are suitable for designs where current margin is required. The BC807-40 variants offer higher DC current gain (250 hFE minimum) compared to BC807-16LT1G (100 hFE minimum).

For Applications with Reduced Voltage Requirements:

MMBT3906LT1G and MMBT3906LT3G are suitable only for circuits where the 40 V collector-emitter breakdown voltage is acceptable. These parts provide 200 mA capability and superior frequency performance (250 MHz), but the reduced voltage rating restricts their use to lower-voltage applications.

For Reduced Power Dissipation:

BCW70LT1G maintains 100 mA current and 45 V voltage specifications with lower maximum power rating (225 mW versus 310 mW). This part is suitable for power-sensitive applications but exhibits lower saturation voltage (300 mV) and lacks specified transition frequency data.

All recommended substitutes are manufactured by onsemi, carry ROHS3 compliance, and maintain MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental specifications.

Frequently Asked Questions (FAQ)

Q: Can BC857ALT1G directly replace BC860AMTF in all applications?

A: BC857ALT1G meets all mandatory electrical parameters: 100 mA collector current, 45 V breakdown voltage, identical saturation voltage (650 mV @ 5 mA, 100 mA), and SOT-23-3 package. The primary difference is transition frequency (100 MHz versus 150 MHz). Direct replacement is valid for applications where the lower frequency specification does not impact circuit performance.

Q: What is the difference between BC857ALT1G, BC857BLT1G, and BC857CLT1G?

A: These three parts are electrically identical except for DC current gain (hFE) specification. BC857ALT1G specifies 125 hFE minimum, BC857BLT1G specifies 220 hFE minimum, and BC857CLT1G specifies 420 hFE minimum. Selection depends on circuit bias requirements. Higher hFE variants require less base current for the same collector current.

Q: Why do BC807 parts have higher collector current (500 mA) than the original BC860AMTF (100 mA)?

A: BC807 parts are designed for higher-current applications. They maintain the same 45 V breakdown voltage and SOT-23-3 package but provide additional current capability. These parts are suitable for BC860AMTF replacement when the application requires current margin or when higher current capacity is beneficial.

Q: Can MMBT3906LT1G replace BC860AMTF?

A: MMBT3906LT1G is not a direct replacement. While it maintains SOT-23-3 packaging and 100 mA minimum current capability, the collector-emitter breakdown voltage is reduced to 40 V (versus 45 V required). Use MMBT3906LT1G only in applications where 40 V breakdown voltage is acceptable.

Q: What does "Active" product status mean compared to "Obsolete"?

A: Active status indicates the manufacturer continues production and supports the part with full technical documentation and supply chain availability. Obsolete status indicates the manufacturer has discontinued production. Substituting BC860AMTF (Obsolete) with an Active part ensures long-term design support and component availability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance certification. The original BC860AMTF does not specify RoHS status. ROHS3 compliance ensures the parts meet current environmental and regulatory requirements for electronic component manufacturing.

Q: What is the significance of packaging variants (CT & Digi-Reel® versus Tape & Reel)?

A: Packaging variants indicate different supply formats. Cut Tape (CT) & Digi-Reel® packaging is suitable for mixed-volume orders and manual assembly. Tape & Reel (TR) packaging is optimized for high-volume automated assembly. Both formats contain identical electronic components; selection depends on manufacturing process requirements.

Q: Can I use BC807-40LT1G and BC807-40LT3G interchangeably?

A: Yes. BC807-40LT1G and BC807-40LT3G are electrically identical. The designation difference (LT1G versus LT3G) indicates different packaging reel configurations. Both parts have identical electrical specifications and can be used interchangeably in circuit designs.

Q: Why does BCW70LT1G have lower saturation voltage (300 mV) than other substitutes?

A: BCW70LT1G is optimized for switching applications with enhanced saturation characteristics. The lower saturation voltage (300 mV @ 500 µA, 10 mA) reduces power dissipation during saturation. This part is suitable for applications prioritizing low saturation voltage, though the measurement conditions differ from other parts listed.

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