BC857AM,315 Equivalent & Substitute Parts

Part Overview

The BC857AM,315 is a PNP bipolar junction transistor manufactured by Nexperia USA Inc., designed for general-purpose switching and amplification applications. This surface mount device operates at 45 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and transition frequency of 100 MHz. The part is classified as Active product status and carries AEC-Q101 automotive qualification. Substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative packaging formats are required for design optimization, or when supply chain constraints necessitate sourcing from alternative manufacturers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	100	mA
Collector-Emitter Breakdown Voltage (Max)	45	V
Transition Frequency	100	MHz
Power Dissipation (Max)	150	mW
Mounting Type	Surface Mount	—
Operating Temperature Range	Up to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BC857AM,315 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor polarity must be PNP
Collector current rating must be 100 mA or greater
Collector-emitter breakdown voltage must be 45 V or greater
Transition frequency must be 100 MHz or greater
Mounting type must be surface mount
Operating temperature range must support 150°C maximum junction temperature
RoHS3 compliance and MSL 1 rating required

Secondary Considerations:

Package format may differ (SOT-883, 3-UFDFN, 3-XFDFN, SOT-1123) provided PCB layout accommodates the alternative footprint
Power dissipation rating may exceed the original specification
DC current gain and saturation voltage variations are acceptable within the specified operating conditions

Substitute parts that do not meet all primary criteria are not electrically equivalent and present functional or reliability risks.

Parameter Comparison

Parameter	BC857AM,315	2DA1774QLP-7	BC857BLP-7	BC857BLP4-7	BC857BLP4-7B	DP0150BLP4-7	NST857BF3T5G
Manufacturer	Nexperia USA Inc.	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	onsemi
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP
Ic (Max) [mA]	100	100	100	100	100	100	100
Vce Breakdown (Max) [V]	45	40	45	45	45	50	45
Frequency - Transition [MHz]	100	100	100	100	100	80	100
Power - Max [mW]	150	250	250	250	250	450	290
Package / Case	SC-101, SOT-883	3-UFDFN	3-UFDFN	3-XFDFN	3-XFDFN	3-XFDFN	SOT-1123
Operating Temperature [°C]	Up to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Discontinued at DiGi Electronics	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Electrical Equivalents (Recommended Primary Substitutes):

BC857BLP-7, BC857BLP4-7, and BC857BLP4-7B (all manufactured by Diodes Incorporated) are direct electrical equivalents to the BC857AM,315. These parts maintain identical PNP polarity, 45 V collector-emitter breakdown voltage, 100 mA collector current rating, and 100 MHz transition frequency. All three parts are Active product status with ROHS3 compliance and MSL 1 rating. The primary difference is package format: BC857BLP-7 uses 3-UFDFN packaging, while BC857BLP4-7 and BC857BLP4-7B use 3-XFDFN packaging. PCB layout compatibility must be verified before selection.

Secondary Electrical Equivalents:

NST857BF3T5G (onsemi) meets all primary substitution criteria with identical electrical specifications. This part uses SOT-1123 packaging, which differs from the original SOT-883 format. The part is Active status with full ROHS3 and MSL 1 compliance.

Conditional Substitutes:

2DA1774QLP-7 (Diodes Incorporated) operates at 40 V collector-emitter breakdown voltage, which is below the 45 V specification of the BC857AM,315. This part is not recommended for applications requiring the full 45 V rating. Additionally, this part is marked as Discontinued at DiGi Electronics, limiting long-term availability.

DP0150BLP4-7 (Diodes Incorporated) operates at 50 V collector-emitter breakdown voltage and 80 MHz transition frequency. While the voltage rating exceeds the original specification, the transition frequency of 80 MHz falls below the 100 MHz requirement. This part is not suitable for applications requiring 100 MHz performance.

Compliance and Certification:

All recommended substitute parts carry ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original BC857AM,315 specification. No additional qualification testing is required based on provided certifications.

Frequently Asked Questions (FAQ)

Q: Can I substitute BC857BLP-7 for BC857AM,315 in my design?

A: Yes. BC857BLP-7 is electrically equivalent to BC857AM,315, maintaining identical PNP polarity, 45 V breakdown voltage, 100 mA collector current, and 100 MHz transition frequency. The primary difference is package format: BC857BLP-7 uses 3-UFDFN while BC857AM,315 uses SOT-883. PCB footprint compatibility must be verified before implementation.

Q: What is the difference between BC857BLP4-7 and BC857BLP4-7B?

A: Both parts are electrically identical PNP transistors with 45 V breakdown voltage, 100 mA collector current, and 100 MHz transition frequency. Both use 3-XFDFN packaging. The primary difference is inventory availability: BC857BLP4-7 has 1,156 pieces in stock while BC857BLP4-7B has 20,777 pieces in stock. Selection should be based on supply chain requirements.

Q: Why is 2DA1774QLP-7 not recommended as a substitute?

A: 2DA1774QLP-7 operates at 40 V collector-emitter breakdown voltage, which is below the 45 V specification of BC857AM,315. Applications requiring the full 45 V rating cannot use this part. Additionally, this part is marked as Discontinued at DiGi Electronics, limiting future availability.

Q: Can I use DP0150BLP4-7 instead of BC857AM,315?

A: DP0150BLP4-7 is not recommended. While it exceeds the voltage specification at 50 V, its transition frequency is 80 MHz, which falls below the 100 MHz requirement of BC857AM,315. Applications requiring 100 MHz performance cannot use this part.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts (BC857BLP-7, BC857BLP4-7, BC857BLP4-7B, and NST857BF3T5G) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original BC857AM,315 specification.

Q: What package formats are available for BC857 PNP transistors?

A: The BC857AM,315 uses SOT-883 packaging. Substitute parts are available in alternative surface mount formats: 3-UFDFN (BC857BLP-7), 3-XFDFN (BC857BLP4-7, BC857BLP4-7B, DP0150BLP4-7), and SOT-1123 (NST857BF3T5G). PCB layout must accommodate the selected package footprint.

Q: Which substitute part has the highest power dissipation rating?

A: DP0150BLP4-7 has the highest power dissipation rating at 450 mW, compared to 150 mW for BC857AM,315. However, DP0150BLP4-7 does not meet the 100 MHz transition frequency requirement and is not recommended as a substitute.

Q: Can I use NST857BF3T5G from onsemi as a substitute?

A: Yes. NST857BF3T5G is electrically equivalent to BC857AM,315 with identical PNP polarity, 45 V breakdown voltage, 100 mA collector current, and 100 MHz transition frequency. The primary difference is package format: NST857BF3T5G uses SOT-1123 while BC857AM,315 uses SOT-883. PCB footprint compatibility must be verified.

Q: Are there any NPN transistor substitutes for the BC857AM,315?

A: No. The BC857AM,315 is a PNP transistor. NPN transistors such as 2DC4617QLP-7 have opposite polarity and cannot be used as direct substitutes. Circuit redesign would be required to use NPN devices.

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