BC858AW-G Equivalent & Substitute Parts

Part Overview

The BC858AW-G is a PNP bipolar junction transistor manufactured by Comchip Technology, designed for general-purpose switching and amplification applications in surface mount configurations. This device operates at a maximum collector current of 100 mA with a collector-emitter breakdown voltage of 30 V and a transition frequency of 100 MHz. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1). Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained within the allowed parameter ranges for this transistor category.

Substiute Parts

BC858AW-G

Comchip TechnologyIn Stock: 1192BC858AW-G Datasheet

Current PartRFQ

NSVBC858AWT1G

onsemiIn Stock: 1079NSVBC858AWT1G Datasheet

DirectRFQ

BC858W,115

Nexperia USA Inc.In Stock: 2498BC858W,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BC858AW-G are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Transistor polarity: PNP
• Maximum collector current: 100 mA
• Collector-emitter breakdown voltage: 30 V
• Package type: SOT-323 (SC-70)
• Mounting configuration: Surface Mount, Tape & Reel
• DC current gain minimum: 125 or greater
• Transition frequency: 100 MHz or greater
• RoHS3 compliance status
• Moisture sensitivity level: 1 (Unlimited)

Acceptable Variation Ranges:

• Vce saturation: up to 650 mV at specified test conditions
• Power dissipation: 150 mW or greater
• Operating temperature range: minimum -65°C to 150°C
• Collector cutoff current: 15 nA or less

Substitutes must maintain identical or superior electrical performance within these defined parameters. Parts that exceed these specifications in power rating, frequency response, or gain characteristics remain functionally compatible for direct replacement.

Parameter Comparison

Engineering Selection Recommendations

BC858AW-G (Comchip Technology) - Primary Part

The BC858AW-G is the reference device specified for this application. All electrical parameters, package specifications, and compliance certifications are fully documented. This part maintains active production status with confirmed inventory availability.

NSVBC858AWT1G (onsemi) - Direct Substitute

The NSVBC858AWT1G is a direct functional equivalent manufactured by onsemi. Both devices share identical package type (SOT-323), mounting configuration (Surface Mount, Tape & Reel), and compliance status (RoHS3, MSL 1). The onsemi part is suitable for direct replacement in applications where the BC858AW-G is specified. Detailed electrical specifications for the onsemi device are not fully provided in the reference data; however, the part designation indicates compatibility with the BC858 series standard.

BC858W,115 (Nexperia USA Inc.) - Qualified Substitute

The BC858W,115 is a qualified substitute manufactured by Nexperia USA Inc. This device meets or exceeds all critical electrical parameters of the BC858AW-G:

• Identical collector current rating (100 mA)
• Identical collector-emitter breakdown voltage (30 V)
• Superior power dissipation rating (200 mW vs. 150 mW)
• Identical transition frequency (100 MHz)
• Identical DC current gain specification (125 minimum)
• Lower Vce saturation (600 mV vs. 650 mV)

The BC858W,115 carries Automotive grade qualification (AEC-Q101) and is suitable for applications requiring enhanced reliability. All package, mounting, and compliance specifications are identical to the primary part. This device is recommended for applications where automotive-grade components are required or where the enhanced power rating provides design margin.

Both substitute parts maintain full compatibility with the BC858AW-G in terms of pinout, package footprint, and electrical performance envelope.

Frequently Asked Questions (FAQ)

Q: Can NSVBC858AWT1G be used as a direct replacement for BC858AW-G?

A: Yes. The NSVBC858AWT1G is a direct substitute. Both devices are PNP transistors in SOT-323 packages with identical mounting type (Surface Mount, Tape & Reel), RoHS3 compliance, and MSL 1 rating. The part designation confirms compatibility with the BC858 series electrical specifications.

Q: What is the difference between BC858AW-G and BC858W,115?

A: The primary differences are manufacturer and power rating. BC858W,115 is manufactured by Nexperia and carries Automotive grade qualification (AEC-Q101). The Nexperia part has a higher maximum power dissipation (200 mW vs. 150 mW) and slightly lower Vce saturation (600 mV vs. 650 mV). All other electrical parameters, package type, and compliance specifications are equivalent or superior.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the SOT-323 package (SC-70), which defines a standard three-pin configuration. The pinout is identical across all three devices, allowing direct PCB footprint compatibility.

Q: Can BC858W,115 be used in non-automotive applications?

A: Yes. The BC858W,115 is qualified for automotive applications but is fully functional in standard industrial and consumer applications. The AEC-Q101 qualification indicates enhanced reliability and testing; it does not restrict use to automotive circuits.

Q: What is the significance of RoHS3 compliance for these parts?

A: RoHS3 compliance indicates that all three parts meet the Restriction of Hazardous Substances Directive requirements. This certification is required for products sold in the European Union and is increasingly required by global supply chains. All three substitute parts maintain this compliance status.

Q: Does moisture sensitivity level (MSL 1) affect storage or handling?

A: MSL 1 (Unlimited) indicates that these parts have no moisture sensitivity restrictions. They can be stored and handled under standard industrial conditions without special desiccant packaging or moisture control measures. This applies to all three parts listed.

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

A: BC858AW-G and NSVBC858AWT1G are specified for -65°C to 150°C. BC858W,115 is specified with a maximum junction temperature of 150°C. All three parts are suitable for industrial temperature ranges (-40°C to 85°C) and extended temperature applications.

Q: Are there any electrical performance differences that would affect circuit design?

A: The three parts are electrically equivalent within the defined parameter ranges. The BC858W,115 offers superior performance margins with higher power rating and lower saturation voltage. For most applications, these differences are not significant. Circuit designs based on the BC858AW-G specifications will function correctly with either substitute part.

Q: What inventory status should be considered when selecting a substitute?

A: BC858W,115 has the highest confirmed inventory (2443 Pcs), followed by NSVBC858AWT1G (1021 Pcs) and BC858AW-G (1090 Pcs). Inventory availability may influence selection for high-volume production requirements, but all three parts are available in production quantities.