BC857AW,135 Equivalent & Substitute Parts

Part Overview

The BC857AW,135 is a small-signal PNP bipolar junction transistor manufactured by Nexperia USA Inc. in SOT-323 surface mount packaging. This component operates at a maximum collector current of 100 mA, collector-emitter breakdown voltage of 45 V, and maximum power dissipation of 200 mW. The device is qualified to AEC-Q101 automotive standards and carries Active product status. Equivalent and substitute parts are identified to support procurement flexibility, packaging format variations, and alternative sourcing from qualified manufacturers while maintaining electrical and mechanical compatibility within specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
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
DC Current Gain (hFE) Min @ Ic, Vce	125 @ 2 mA, 5 V	—
Power - Max	200	mW
Frequency - Transition	100	MHz
Operating Temperature (TJ)	150	°C
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BC857AW,135 is determined by strict equivalence across the following critical parameters: transistor type (PNP), maximum collector current (100 mA), collector-emitter breakdown voltage (45 V), maximum power dissipation (200 mW), surface mount packaging format, and base product number (BC857). Parts are grouped into three categories based on substitution relationship:

Parametric Equivalents maintain identical electrical specifications and differ only in packaging format (Bulk vs. Tape & Reel) or minor manufacturer designation variations. These parts are direct functional replacements.

Direct Manufacturer Equivalents share the same electrical specifications but originate from alternative manufacturers (Diodes Incorporated) and may exhibit minor variations in transition frequency (200 MHz vs. 100 MHz) or saturation voltage (650 mV vs. 600 mV) within acceptable tolerances.

Similar Parts maintain core electrical parameters (PNP type, 100 mA collector current, 45 V breakdown voltage) but differ in one or more secondary characteristics such as package type (SOT-23 vs. SOT-323), power rating (310 mW vs. 200 mW), DC current gain range, or base product designation (BC807, BC857A, BC857B, BC857C variants). These parts require design verification for specific application constraints.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce Breakdown (Max) V	Vce Sat (Max) mV	hFE (Min)	Frequency MHz	Power (Max) mW	Package	Packaging Format	AEC-Q101
BC857AW,135	Nexperia USA Inc.	100	45	600	125	100	200	SOT-323	Tape & Reel	Yes
BC857AW,115	NXP Semiconductors	100	45	600	125	100	200	SOT-323	Bulk	Yes
BC857W,115	Nexperia USA Inc.	100	45	600	125	100	200	SOT-323	Cut Tape & Digi-Reel	Yes
BC857W,135	NXP USA Inc.	100	45	600	125	100	200	SOT-323	Bulk	Yes
BC857AW-7-F	Diodes Incorporated	100	45	650	125	200	200	SOT-323	Tape & Reel	No
BC807-25W-7	Diodes Incorporated	500	45	700	160	100	200	SOT-323	Cut Tape & Digi-Reel	No
BC857A-TP	Micro Commercial Co	100	45	650	125	200	310	SOT-23	Tape & Reel	No
BC857BTT1G	onsemi	100	45	650	220	100	200	SOT-416	Cut Tape & Digi-Reel	No
BC857BW-7-F	Diodes Incorporated	100	45	650	220	200	200	SOT-323	Tape & Reel	No
BC857BWT1G	onsemi	100	100	650	220	100	150	SOT-323	Cut Tape & Digi-Reel	No
BC857CW-7-F	Diodes Incorporated	100	45	650	420	200	200	SOT-323	Tape & Reel	No

Engineering Selection Recommendations

Parametric Equivalents (BC857AW,115, BC857W,115, BC857W,135) are direct functional replacements for the BC857AW,135. These parts maintain identical electrical specifications and AEC-Q101 automotive qualification. Selection among these equivalents is determined by packaging format availability and procurement requirements. BC857AW,115 and BC857W,135 are available in Bulk format; BC857W,115 is supplied in Cut Tape & Digi-Reel format. All three are ROHS3 compliant and carry Active product status.

Direct Manufacturer Equivalent (BC857AW-7-F) from Diodes Incorporated provides functional substitution with transition frequency increased to 200 MHz and saturation voltage increased to 650 mV. This part does not carry AEC-Q101 qualification. Selection is appropriate for non-automotive applications where the higher transition frequency is beneficial and automotive qualification is not required.

Similar Parts (BC807-25W-7, BC857A-TP, BC857BTT1G, BC857BW-7-F, BC857CW-7-F) share the core PNP type and 100 mA collector current specification but introduce variations that require design-level evaluation:

BC807-25W-7 exhibits 500 mA maximum collector current, exceeding the 100 mA specification of the main part. This part is suitable only for applications requiring higher current capability.

BC857A-TP uses SOT-23 packaging instead of SOT-323, introducing different footprint and thermal characteristics. Power dissipation is increased to 310 mW. This part is suitable for applications with different PCB layout constraints.

BC857BTT1G, BC857BW-7-F, and BC857CW-7-F employ SOT-323 packaging but exhibit elevated DC current gain (220 to 420 at 2 mA, 5 V) compared to the 125 minimum specification of the main part. These variants are suitable for applications where higher current gain is beneficial or neutral.

BC857BWT1G exhibits reduced maximum power dissipation (150 mW vs. 200 mW), requiring thermal design verification in power-limited applications.

All substitute parts carry ROHS3 compliance and Active product status. None of the substitute parts listed carry AEC-Q101 automotive qualification except the parametric equivalents.

Frequently Asked Questions (FAQ)

Q: Can BC857AW,115 be used as a direct replacement for BC857AW,135?

A: Yes. BC857AW,115 is a parametric equivalent with identical electrical specifications. The difference is packaging format: BC857AW,135 is supplied in Tape & Reel format, while BC857AW,115 is supplied in Bulk format. Both maintain AEC-Q101 automotive qualification and ROHS3 compliance.

Q: What is the difference between BC857W,115 and BC857AW,135?

A: Both parts are parametric equivalents with identical electrical specifications (100 mA collector current, 45 V breakdown voltage, 200 mW power, 100 MHz transition frequency). BC857W,115 is supplied in Cut Tape & Digi-Reel format, while BC857AW,135 is supplied in Tape & Reel format. Both carry AEC-Q101 qualification.

Q: Can BC857AW-7-F from Diodes Incorporated replace BC857AW,135?

A: BC857AW-7-F provides functional substitution with identical collector current (100 mA) and breakdown voltage (45 V). However, it exhibits higher transition frequency (200 MHz vs. 100 MHz) and higher saturation voltage (650 mV vs. 600 mV). This part does not carry AEC-Q101 automotive qualification. Use is appropriate for non-automotive applications where these parameter variations are acceptable.

Q: Why is BC807-25W-7 listed as a similar part if it has 500 mA collector current?

A: BC807-25W-7 shares the same base product family (BC80x series), PNP type, 45 V breakdown voltage, and SOT-323 packaging. However, the 500 mA collector current specification exceeds the 100 mA maximum of BC857AW,135. This part is suitable only for applications requiring higher current capability and is not a direct substitute for current-limited designs.

Q: What is the significance of the different DC current gain (hFE) values among substitute parts?

A: DC current gain determines the base current required to achieve a specified collector current. BC857AW,135 specifies minimum hFE of 125 at 2 mA collector current and 5 V collector-emitter voltage. Substitute parts with higher hFE values (BC857BW-7-F at 220, BC857CW-7-F at 420) require less base current for the same collector current. Parts with identical or higher hFE are suitable substitutes; lower hFE values require design verification.

Q: Can BC857A-TP in SOT-23 packaging be used instead of BC857AW,135 in SOT-323?

A: BC857A-TP provides electrical equivalence (100 mA collector current, 45 V breakdown voltage, 125 minimum hFE) but uses SOT-23 packaging instead of SOT-323. This introduces different PCB footprint, pin spacing, and thermal characteristics. Power dissipation is increased to 310 mW. Use requires PCB layout redesign and thermal analysis. This part does not carry AEC-Q101 qualification.

Q: What does AEC-Q101 qualification mean for automotive applications?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. It specifies reliability, quality, and performance requirements for automotive-grade components. Only BC857AW,135, BC857AW,115, BC857W,115, and BC857W,135 carry this qualification. Use of non-qualified parts in automotive applications requires explicit design approval and risk assessment.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed in this reference carry ROHS3 compliance status, indicating conformance to Restriction of Hazardous Substances Directive requirements.

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

A: Tape & Reel format supplies components on continuous carrier tape wound on reels, suitable for automated assembly. Cut Tape & Digi-Reel format supplies components on cut tape segments or small reels for lower-volume applications. Bulk format supplies loose components in trays or bags. Electrical specifications are identical across all formats; selection is based on procurement volume and assembly equipment compatibility.

Q: Can BC857BWT1G with 150 mW maximum power be used in applications designed for 200 mW dissipation?

A: BC857BWT1G exhibits reduced maximum power dissipation (150 mW vs. 200 mW). Use in applications designed for 200 mW dissipation requires thermal design verification to ensure actual power dissipation remains below 150 mW under worst-case operating conditions. This part is suitable only if thermal analysis confirms compliance.

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