BC847CMB,315 Equivalent & Substitute Parts

Part Overview

The BC847CMB,315 is an NPN bipolar junction transistor manufactured by Nexperia USA Inc., designed for general-purpose switching and amplification applications. This surface mount device operates at a maximum collector voltage of 45 V with a collector current rating of 100 mA and a transition frequency of 100 MHz. The part is classified as Active product status and carries AEC-Q101 automotive qualification, making it suitable for automotive and industrial applications. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Substiute Parts

BC847CMB,315

Nexperia USA Inc.In Stock: 10197BC847CMB,315 Datasheet

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BC847BLP4-7B

Diodes IncorporatedIn Stock: 11007BC847BLP4-7B Datasheet

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NST847BF3T5G

onsemiIn Stock: 6422NST847BF3T5G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BC847CMB,315 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Transistor Type: NPN
• Maximum Collector Current (Ic): 100 mA
• Maximum Collector-Emitter Breakdown Voltage: 45 V
• Transition Frequency: 100 MHz
• Maximum Operating Temperature: 150°C or higher
• Surface Mount configuration
• RoHS3 compliance
• Moisture Sensitivity Level 1

Acceptable Variations:

• Package form factor (DFN1006B-3, X2-DFN1006-3, SOT-1123) provided mechanical fit is verified
• DC Current Gain (hFE) minimum values may vary within the NPN classification
• Vce Saturation specifications may differ within acceptable operating ranges
• Maximum Power dissipation may exceed the original specification (250 mW minimum)
• Operating temperature range may extend below 0°C

The identified substitute parts BC847BLP4-7B and NST847BF3T5G meet these criteria and are classified as Active products with equivalent electrical performance.

Parameter Comparison

Engineering Selection Recommendations

BC847BLP4-7B (Diodes Incorporated): This substitute maintains identical electrical specifications to the BC847CMB,315 across all critical parameters: 100 mA collector current, 45 V breakdown voltage, 100 MHz transition frequency, and 250 mW power dissipation. The package form factor is 3-XFDFN (X2-DFN1006-3), which is mechanically compatible with the original DFN1006B-3 footprint. Both devices are ROHS3 compliant with MSL 1 rating and Active product status. The DC Current Gain minimum is lower (200 vs. 420 @ 2mA, 5V), which may require circuit verification in gain-sensitive applications. Operating temperature range extends to −55°C, providing broader environmental coverage.

NST847BF3T5G (onsemi): This substitute meets all critical electrical parameters with 100 mA collector current, 45 V breakdown voltage, and 100 MHz transition frequency. The maximum power dissipation is 290 mW, exceeding the original 250 mW specification. The package form factor is SOT-1123, which differs from the original DFN1006B-3. PCB layout and footprint modifications are required for this substitution. Both devices are ROHS3 compliant with MSL 1 rating and Active product status. The DC Current Gain minimum is 200 @ 2mA, 5V. Operating temperature range extends to −55°C.

Selection between substitutes depends on package compatibility requirements and thermal design margins. BC847BLP4-7B is preferred for direct footprint compatibility. NST847BF3T5G is suitable when package form factor flexibility exists and additional thermal headroom is beneficial.

Frequently Asked Questions (FAQ)

Q: Can BC847BLP4-7B be used as a direct replacement for BC847CMB,315 without PCB modifications?

A: BC847BLP4-7B uses the 3-XFDFN package form factor (X2-DFN1006-3), which is mechanically compatible with the original DFN1006B-3 footprint. Direct PCB substitution is possible without layout modifications. However, the DC Current Gain minimum specification differs (200 vs. 420), requiring circuit performance verification in applications where gain is a critical design parameter.

Q: What are the key differences between BC847BLP4-7B and NST847BF3T5G?

A: Both substitutes meet the core electrical requirements (100 mA, 45 V, 100 MHz). The primary differences are: (1) Package form factor—BC847BLP4-7B uses 3-XFDFN while NST847BF3T5G uses SOT-1123, requiring different PCB footprints; (2) Maximum power dissipation—NST847BF3T5G is rated at 290 mW versus 250 mW for both other devices; (3) Vce Saturation specifications differ between the parts. NST847BF3T5G requires PCB redesign due to package differences.

Q: Are all three parts (BC847CMB,315, BC847BLP4-7B, NST847BF3T5G) suitable for automotive applications?

A: BC847CMB,315 carries AEC-Q101 automotive qualification. BC847BLP4-7B and NST847BF3T5G are not specified with automotive qualification in the provided data. Automotive application suitability must be confirmed through manufacturer documentation and design requirements before substitution.

Q: What is the significance of the DC Current Gain (hFE) difference between these parts?

A: BC847CMB,315 specifies hFE minimum of 420 @ 2mA, 5V, while both substitutes specify 200 @ 2mA, 5V. In circuits where transistor gain directly affects performance (such as current amplification stages or biasing networks), this difference may require recalculation of base current requirements and circuit validation. Applications with fixed base current biasing are less sensitive to this variation.

Q: Can NST847BF3T5G be used in the same PCB layout as BC847CMB,315?

A: No. NST847BF3T5G uses SOT-1123 package while BC847CMB,315 uses DFN1006B-3. These packages have different pin configurations and footprints. PCB redesign is required for NST847BF3T5G substitution.

Q: Are moisture sensitivity and RoHS compliance identical across all three parts?

A: Yes. All three parts are rated MSL 1 (Unlimited moisture sensitivity) and ROHS3 compliant, ensuring equivalent handling and environmental compliance requirements.

Q: What is the operating temperature range for each part?

A: BC847CMB,315 is specified to 150°C maximum junction temperature. BC847BLP4-7B and NST847BF3T5G both specify −55°C to 150°C operating range, providing extended low-temperature capability.