BC857T,115 PNP Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The BC857T,115 is a PNP bipolar junction transistor manufactured by NXP USA Inc., designed for general-purpose switching and amplification applications. This device operates at 45 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and 150 mW power dissipation in an SC-75 surface mount package.

The BC857T,115 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Active alternatives from multiple manufacturers provide compatible electrical and mechanical characteristics suitable for direct replacement in existing designs.

Key Parameters

Parameter	BC857T,115	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	45	V
Current - Collector (Ic) (Max)	100	mA
Power - Max	150	mW
Frequency - Transition	100	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	125 @ 2mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	400mV @ 5mA, 100mA	—
Current - Collector Cutoff (Max)	15nA	—
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-75, SOT-416	—
RoHS Status	ROHS3 Compliant	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitute parts for the BC857T,115 are selected based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Transistor Type: PNP (required for circuit polarity compatibility)
Voltage - Collector Emitter Breakdown (Max): 45 V (minimum threshold for voltage rating)
Current - Collector (Ic) (Max): ≥100 mA (equal or higher current capability)
Frequency - Transition: 100 MHz (switching speed requirement)
Power - Max: ≥150 mW (thermal capability)

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount (PCB assembly compatibility)
Package / Case: SOT-23-3 or TO-236-3 (pin-compatible alternatives to SC-75)

Compliance & Status:

Product Status: Active (ongoing availability)
RoHS Status: ROHS3 Compliant (environmental compliance)
Moisture Sensitivity Level: 1 (Unlimited) (handling and storage compatibility)

All substitute parts listed meet or exceed the BC857T,115 electrical specifications while maintaining surface mount compatibility. The BC807 series variants from Diodes Incorporated, Micro Commercial Co, and onsemi provide higher current ratings (500 mA) and power dissipation (300–310 mW), ensuring robust performance in replacement applications.

Parameter Comparison

Parameter	BC857T,115	BC807-16-7-F	BC807-16-TP	BC807-16LT1G	BC807-16LT3G	BC807-25-7-F	BC807-25-TP	BC807-25LT1G	BC807-25LT3G	BC807-40-7-F	BC807-40-TP	Unit
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	—
Voltage - Collector Emitter Breakdown (Max)	45	45	45	45	45	45	45	45	45	45	45	V
Current - Collector (Ic) (Max)	100	500	500	500	500	500	500	500	500	500	500	mA
Power - Max	150	310	300	300	300	310	300	300	300	310	300	mW
Frequency - Transition	100	100	100	100	100	100	100	100	100	100	100	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	125 @ 2mA, 5V	100 @ 100mA, 1V	100 @ 100mA, 1V	100 @ 100mA, 1V	100 @ 100mA, 1V	160 @ 100mA, 1V	160 @ 100mA, 1V	160 @ 100mA, 1V	160 @ 100mA, 1V	250 @ 100mA, 1V	250 @ 100mA, 1V	—
Vce Saturation (Max) @ Ib, Ic	400mV @ 5mA, 100mA	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA	—
Current - Collector Cutoff (Max)	15nA	100nA	200nA	100nA	100nA	100nA	200nA	100nA	100nA	100nA	200nA	nA
Operating Temperature (TJ)	150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	-55 to 150	°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	—
Package / Case	SC-75, SOT-416	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	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	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	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	—
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active	—

Engineering Selection Recommendations

Primary Selection Criteria:

All listed BC807 variants are active products with ROHS3 compliance and MSL 1 rating, ensuring long-term availability and environmental regulatory compliance. The BC857T,115 is obsolete; therefore, substitution is necessary for new designs and ongoing production support.

Manufacturer-Specific Considerations:

onsemi BC807-25LT1G and BC807-25LT3G: Highest inventory availability (293,400 and 305,300 units respectively). Both variants provide identical electrical specifications with 160 mA minimum DC current gain at 100 mA collector current. The LT1G variant is supplied in Cut Tape & Digi-Reel packaging; LT3G is supplied in Cut Tape & Digi-Reel packaging. Both support extended operating temperature range (-55°C to 150°C).
Diodes Incorporated BC807-25-7-F and BC807-40-7-F: Provide 310 mW power dissipation (highest among substitutes). BC807-25-7-F offers 160 mA minimum DC current gain; BC807-40-7-F offers 250 mA minimum DC current gain. Both are supplied in Cut Tape & Digi-Reel packaging with 26,100 and 17,100 units in stock respectively.
Micro Commercial Co BC807-25-TP and BC807-40-TP: Provide 300 mW power dissipation with Tape & Reel packaging. BC807-25-TP offers 160 mA minimum DC current gain (28,010 units); BC807-40-TP offers 250 mA minimum DC current gain (1,430 units).
Diodes Incorporated BC807-16-7-F and onsemi BC807-16LT1G/BC807-16LT3G: Provide 100 mA minimum DC current gain. BC807-16-7-F offers 310 mW power dissipation (15,635 units); onsemi variants offer 300 mW (146,930 and 30,400 units respectively).

Package Compatibility Note:

The BC857T,115 uses SC-75 (SOT-416) packaging. All substitute parts use SOT-23-3 (TO-236-3, SC-59) packaging. PCB layout modification is required for physical placement compatibility, though electrical pin configuration remains compatible for PNP operation.

Frequently Asked Questions (FAQ)

Q1: Can BC807 series transistors directly replace BC857T,115 without PCB modification?

A: Electrical substitution is direct; however, physical package differences require PCB layout modification. The BC857T,115 uses SC-75 (SOT-416) packaging, while all BC807 substitutes use SOT-23-3 (TO-236-3) packaging. Pin functions remain electrically compatible for PNP operation, but footprint redesign is necessary.

Q2: What is the primary advantage of BC807 substitutes over the obsolete BC857T,115?

A: BC807 variants provide higher collector current capability (500 mA vs. 100 mA) and greater power dissipation (300–310 mW vs. 150 mW). All substitutes are active products with confirmed long-term availability, whereas BC857T,115 is obsolete. Extended operating temperature range (-55°C to 150°C) provides additional thermal margin compared to the BC857T,115 (150°C maximum).

Q3: Are there differences in DC current gain (hFE) among BC807 variants?

A: Yes. BC807-16 variants specify 100 mA minimum hFE at 100 mA collector current. BC807-25 variants specify 160 mA minimum hFE. BC807-40 variants specify 250 mA minimum hFE. Selection depends on circuit gain requirements. Higher hFE variants (BC807-40) require lower base drive current for equivalent collector current.

Q4: Which BC807 variant offers the best inventory availability?

A: onsemi BC807-25LT1G and BC807-25LT3G provide the highest inventory levels (293,400 and 305,300 units respectively). Both offer identical electrical specifications with 160 mA minimum DC current gain and 300 mW power dissipation. LT1G is supplied in Cut Tape & Digi-Reel; LT3G is supplied in Cut Tape & Digi-Reel packaging.

Q5: What is the difference between Diodes Incorporated and onsemi BC807-25 variants?

A: Diodes Incorporated BC807-25-7-F provides 310 mW power dissipation and 100 nA maximum collector cutoff current. onsemi BC807-25LT1G and BC807-25LT3G provide 300 mW power dissipation and identical 100 nA maximum collector cutoff current. Electrical performance is equivalent; packaging and supplier availability differ.

Q6: Is the BC857T,115 automotive-grade qualification (AEC-Q101) maintained in BC807 substitutes?

A: The provided BC807 substitute data does not specify AEC-Q101 qualification. If automotive-grade qualification is required for your application, contact the respective manufacturer (Diodes Incorporated, Micro Commercial Co, or onsemi) to confirm AEC-Q101 compliance for specific BC807 part numbers.

Q7: Can BC807-16 variants be used instead of BC807-25 or BC807-40 variants?

A: BC807-16 variants are electrically compatible and provide the same 45 V breakdown voltage, 500 mA collector current, and 100 MHz transition frequency. The primary difference is lower DC current gain (100 mA minimum vs. 160 or 250 mA). Use BC807-16 only if circuit design accommodates lower gain; otherwise, select BC807-25 or BC807-40 for higher gain margin.

Q8: What packaging options are available for BC807 substitutes?

A: All BC807 substitutes use SOT-23-3 (TO-236-3, SC-59) surface mount packaging. Packaging format options include Cut Tape & Digi-Reel (Diodes Incorporated, onsemi LT1G/LT3G variants) and Tape & Reel (Micro Commercial Co, onsemi LT3G). Select based on assembly process requirements and tape reel compatibility.

Q9: Are all BC807 substitutes RoHS3 compliant?

A: Yes. All listed BC807 variants are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard PCB assembly processes and long-term storage without desiccant requirements.

Q10: What is the operating temperature range difference between BC857T,115 and BC807 substitutes?

A: BC857T,115 specifies 150°C maximum junction temperature. BC807 substitutes specify -55°C to 150°C operating range, providing 55°C lower temperature margin at the cold end. This extended range supports applications requiring operation in wider environmental temperature conditions.

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