BC857BM-TP Equivalent & Substitute Parts

Part Overview

The BC857BM-TP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This component operates at a maximum collector current of 100 mA with a collector-emitter breakdown voltage of 45 V and a transition frequency of 100 MHz. The BC857BM-TP is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. Active alternatives from the BC857 base product family are available to maintain design continuity.

Substiute Parts

BC857BM-TP

Micro Commercial CoIn Stock: 1133BC857BM-TP Datasheet

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BC857BL3-TP

Micro Commercial CoIn Stock: 747BC857BL3-TP Datasheet

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BC857BLP4-7

Diodes IncorporatedIn Stock: 1204BC857BLP4-7 Datasheet

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BC857BLP4-7B

Diodes IncorporatedIn Stock: 20816BC857BLP4-7B Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BC857BM-TP is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Transistor Type: PNP configuration
• Current - Collector (Ic) (Max): 100 mA
• Voltage - Collector Emitter Breakdown (Max): 45 V
• DC Current Gain (hFE) (Min) @ Ic, Vce: 220 @ 2 mA, 5 V
• Frequency - Transition: 100 MHz
• Operating Temperature Range: -55°C ~ 150°C (TJ)

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount
• Base Product Number: BC857

The substitute parts identified maintain these core electrical specifications while offering variations in packaging format and power dissipation ratings. All substitutes are compliant with ROHS3 and REACH requirements, ensuring regulatory alignment with the original component.

Parameter Comparison

Engineering Selection Recommendations

BC857BL3-TP (Micro Commercial Co)

The BC857BL3-TP is an active product from Micro Commercial Co maintaining the same manufacturer lineage as the obsolete BC857BM-TP. This part satisfies the core electrical requirements of 100 mA collector current and 45 V breakdown voltage. The transition to DFN1006-3 packaging represents a package variant within the BC857 family. This substitute is suitable for applications where manufacturer continuity with Micro Commercial Co is preferred and where the specified power dissipation of 150 mW is adequate.

BC857BLP4-7 and BC857BLP4-7B (Diodes Incorporated)

Both BC857BLP4-7 and BC857BLP4-7B are active products from Diodes Incorporated offering enhanced specifications relative to the BC857BM-TP. These parts maintain full electrical compatibility with DC current gain of 220 @ 2 mA, 5 V and transition frequency of 100 MHz across the -55°C to 150°C operating range. The X2-DFN1006-3 package provides increased power dissipation capability at 250 mW. The BC857BLP4-7B variant offers significantly higher inventory availability (20,777 pieces) compared to BC857BLP4-7 (1,156 pieces), supporting supply chain continuity. Both parts are ROHS3 compliant and REACH unaffected, ensuring regulatory compliance equivalent to the original component.

Frequently Asked Questions (FAQ)

Q: Can BC857BL3-TP be used as a direct replacement for BC857BM-TP?

A: The BC857BL3-TP maintains electrical compatibility with the BC857BM-TP across all specified parameters including collector current, breakdown voltage, and current gain. The primary difference is the package format change from SOT-883 to DFN1006-3. PCB layout modifications are required to accommodate the different package geometry. Both parts are ROHS3 compliant with MSL 1 rating.

Q: What are the differences between BC857BLP4-7 and BC857BLP4-7B?

A: The BC857BLP4-7 and BC857BLP4-7B are electrically identical, both manufactured by Diodes Incorporated with identical electrical specifications including 100 MHz transition frequency and 220 hFE minimum gain. Both use the X2-DFN1006-3 package. The primary distinction is inventory availability, with BC857BLP4-7B offering substantially higher stock levels. Selection between these variants should be based on procurement lead time and supply chain requirements.

Q: Are package changes between SOT-883 and DFN1006-3 compatible with existing PCB designs?

A: No. SOT-883 and DFN1006-3 packages have different footprints and pin configurations. PCB redesign is required to accommodate package substitution. The BC857BLP4-7 and BC857BLP4-7B use X2-DFN1006-3 packaging, which differs from the DFN1006-3 used by BC857BL3-TP. Verify footprint compatibility with your PCB design before component selection.

Q: Do all substitute parts meet the same regulatory requirements as BC857BM-TP?

A: Yes. All identified substitute parts (BC857BL3-TP, BC857BLP4-7, and BC857BLP4-7B) are ROHS3 compliant and REACH unaffected, matching the regulatory status of the BC857BM-TP. All parts carry MSL 1 (Unlimited) moisture sensitivity rating.

Q: Which substitute part offers the best thermal performance?

A: The BC857BLP4-7 and BC857BLP4-7B offer maximum power dissipation of 250 mW, compared to 150 mW for BC857BL3-TP. Both Diodes Incorporated variants support higher power applications within the 100 mA collector current specification. Operating temperature range remains -55°C to 150°C across all substitutes.

Q: Is the BC857BM-TP still available for procurement?

A: The BC857BM-TP is classified as obsolete. Current inventory of 1,062 pieces is available, but long-term procurement should transition to active alternatives. BC857BLP4-7B offers the highest inventory availability at 20,777 pieces, supporting sustained supply chain requirements.