BC847AMTF Equivalent & Substitute Parts

Part Overview

The BC847AMTF is an NPN bipolar junction transistor manufactured by onsemi, housed in a SOT-23-3 surface mount package. This device is rated for 45 V collector-emitter breakdown voltage and 100 mA maximum collector current, with a maximum power dissipation of 310 mW. The BC847AMTF is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and legacy system support.

Key Parameters

Parameter	BC847AMTF Value
Transistor Type	NPN
Current - Collector (Ic) Max	100 mA
Voltage - Collector Emitter Breakdown (Max)	45 V
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5 mA, 100 mA
Current - Collector Cutoff (Max)	15 nA (ICBO)
DC Current Gain (hFE) Min @ Ic, Vce	110 @ 2 mA, 5 V
Power - Max	310 mW
Frequency - Transition	300 MHz
Operating Temperature	150°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the BC847AMTF is determined by the following critical parameters:

Direct Electrical Compatibility Requirements:

Transistor type must be NPN
Collector-emitter breakdown voltage must be 45 V or greater
Maximum collector current must be 100 mA or greater
Package must be SOT-23-3 (TO-236-3, SC-59)
Surface mount mounting type

Acceptable Substitution Categories:

Category 1: Direct Equivalents (100% Pin and Electrical Compatible) Parts that maintain identical maximum ratings and electrical characteristics within the BC847 base product family. These parts are fully interchangeable with the BC847AMTF in existing designs.

Category 2: Higher Current Capability (BC817 Series) Parts rated for 500 mA maximum collector current while maintaining 45 V breakdown voltage and SOT-23-3 packaging. These parts provide enhanced current handling capability and are electrically compatible for applications requiring higher current capacity.

All substitute parts listed are active product status from onsemi, ensuring long-term availability and supply chain continuity compared to the obsolete BC847AMTF.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max)	Vce Breakdown (Max)	Vce Sat @ Ib, Ic	hFE Min @ Ic, Vce	Power (Max)	Frequency (Transition)	Operating Temp	Package	RoHS Status
BC847AMTF	onsemi	Obsolete	100 mA	45 V	600 mV @ 5 mA, 100 mA	110 @ 2 mA, 5 V	310 mW	300 MHz	150°C (TJ)	SOT-23-3	REACH Unaffected
BC847ALT1G	onsemi	Active	100 mA	45 V	600 mV @ 5 mA, 100 mA	110 @ 2 mA, 5 V	300 mW	100 MHz	-55°C ~ 150°C (TJ)	SOT-23-3	ROHS3 Compliant
BC847BLT1G	onsemi	Active	100 mA	45 V	600 mV @ 5 mA, 100 mA	200 @ 2 mA, 5 V	300 mW	100 MHz	-55°C ~ 150°C (TJ)	SOT-23-3	ROHS3 Compliant
BC847BLT3G	onsemi	Active	100 mA	45 V	600 mV @ 5 mA, 100 mA	200 @ 2 mA, 5 V	300 mW	100 MHz	-55°C ~ 150°C (TJ)	SOT-23-3	ROHS3 Compliant
BC847CLT1G	onsemi	Active	100 mA	45 V	600 mV @ 5 mA, 100 mA	420 @ 2 mA, 5 V	300 mW	100 MHz	-55°C ~ 150°C (TJ)	SOT-23-3	ROHS3 Compliant
BC817-16LT1G	onsemi	Active	500 mA	45 V	700 mV @ 50 mA, 500 mA	100 @ 100 mA, 1 V	300 mW	100 MHz	-65°C ~ 150°C (TJ)	SOT-23-3	ROHS3 Compliant
BC817-16LT3G	onsemi	Active	500 mA	45 V	700 mV @ 50 mA, 500 mA	100 @ 100 mA, 1 V	300 mW	100 MHz	-65°C ~ 150°C (TJ)	SOT-23-3	ROHS3 Compliant
BC817-25LT1G	onsemi	Active	500 mA	45 V	700 mV @ 50 mA, 500 mA	160 @ 100 mA, 1 V	300 mW	100 MHz	-65°C ~ 150°C (TJ)	SOT-23-3	ROHS3 Compliant
BC817-25LT3G	onsemi	Active	500 mA	45 V	700 mV @ 50 mA, 500 mA	160 @ 100 mA, 1 V	300 mW	100 MHz	-65°C ~ 150°C (TJ)	SOT-23-3	ROHS3 Compliant
BC817-40LT1G	onsemi	Active	500 mA	45 V	700 mV @ 50 mA, 500 mA	250 @ 100 mA, 1 V	300 mW	100 MHz	-65°C ~ 150°C (TJ)	SOT-23-3	ROHS3 Compliant
BC817-40LT3G	onsemi	Active	500 mA	45 V	700 mV @ 50 mA, 500 mA	250 @ 100 mA, 1 V	300 mW	100 MHz	-65°C ~ 150°C (TJ)	SOT-23-3	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

BC847ALT1G, BC847BLT1G, BC847BLT3G, and BC847CLT1G are active product alternatives within the BC847 base product family. These parts maintain the same maximum collector current (100 mA) and collector-emitter breakdown voltage (45 V) as the BC847AMTF. All substitute parts are ROHS3 compliant and REACH unaffected, providing regulatory compliance advantages over the obsolete BC847AMTF. The primary differences among these alternatives are DC current gain specifications and operating temperature ranges, which expand to -55°C minimum compared to the BC847AMTF specification.

For Enhanced Current Capability:

BC817-16LT1G, BC817-16LT3G, BC817-25LT1G, BC817-25LT3G, BC817-40LT1G, and BC817-40LT3G are suitable for applications requiring higher collector current capacity (500 mA maximum). These parts maintain the 45 V breakdown voltage and SOT-23-3 package compatibility. The BC817 series offers extended operating temperature range (-65°C to 150°C) and varying DC current gain specifications. Selection among BC817 variants depends on required hFE characteristics and packaging format (Cut Tape & Digi-Reel versus Tape & Reel).

All listed substitute parts are active product status from onsemi, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can BC847ALT1G directly replace BC847AMTF in existing designs?

A: Yes. BC847ALT1G maintains identical maximum ratings for collector current (100 mA) and collector-emitter breakdown voltage (45 V), with matching saturation voltage characteristics and SOT-23-3 packaging. The primary difference is active product status and ROHS3 compliance, which provide regulatory advantages.

Q: What is the difference between BC847 and BC817 series transistors?

A: The BC817 series is rated for 500 mA maximum collector current, compared to 100 mA for the BC847 series. Both maintain 45 V breakdown voltage and SOT-23-3 packaging. BC817 parts are suitable for applications requiring higher current handling capability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, providing regulatory compliance advantages over the obsolete BC847AMTF.

Q: What is the significance of the hFE suffix in BC847 and BC817 part numbers?

A: The hFE suffix indicates the DC current gain specification. BC847ALT1G specifies hFE minimum of 110, BC847BLT1G specifies 200, and BC847CLT1G specifies 420. BC817 variants specify hFE values of 100, 160, or 250 depending on the specific part number. Selection depends on circuit requirements for current amplification.

Q: Can I use BC817-40LT1G in place of BC847AMTF?

A: BC817-40LT1G is electrically compatible for applications where the BC847AMTF operates below 100 mA collector current. The higher current rating (500 mA) and different saturation voltage characteristics (700 mV at 50 mA, 500 mA versus 600 mV at 5 mA, 100 mA) require circuit analysis to confirm suitability. The BC817-40LT1G is appropriate for designs requiring enhanced current capacity or higher hFE (250 minimum).

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

A: Cut Tape & Digi-Reel packaging is supplied on cut tape with reel options for automated assembly. Tape & Reel packaging is supplied on continuous reel format. Both formats contain identical electronic components; packaging selection depends on assembly equipment and production volume requirements.

Q: Is the operating temperature range important for substitution?

A: Operating temperature range affects component suitability for specific applications. BC847ALT1G, BC847BLT1G, BC847BLT3G, and BC847CLT1G specify -55°C to 150°C, while BC817 variants specify -65°C to 150°C. The BC847AMTF specifies only 150°C maximum. Applications requiring low-temperature operation benefit from substitute parts with extended minimum temperature ratings.

Q: Why is the BC847AMTF classified as obsolete?

A: Obsolete product status indicates the manufacturer has discontinued production. Active substitute parts from the BC847 and BC817 families provide equivalent or enhanced functionality with continued manufacturing support and supply availability.

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