BC368G Equivalent & Substitute Parts

Part Overview

The BC368G is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. It features a maximum collector current of 1 A, collector-emitter breakdown voltage of 20 V, and a power dissipation rating of 625 mW in a through-hole TO-92 package. The BC368G is classified as an obsolete product, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility while accommodating modern packaging and manufacturing standards.

Substiute Parts

BC368G

onsemiIn Stock: 1132BC368G Datasheet

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MMBT489LT1G

onsemiIn Stock: 39122MMBT489LT1G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BC368G is determined by electrical parameter compatibility within the NPN transistor category. The primary substitution candidate, MMBT489LT1G, maintains functional equivalence through the following critical parameters:

Electrical Compatibility Criteria:

• Transistor polarity: NPN (identical)
• Maximum collector current: 1 A (identical)
• Collector-emitter breakdown voltage: 30 V (exceeds 20 V requirement)
• Operating temperature range: -55°C ~ 150°C (identical)
• Power dissipation: 710 mW (exceeds 625 mW requirement)

Functional Differences: The MMBT489LT1G provides enhanced electrical performance characteristics including higher breakdown voltage (30 V vs. 20 V), improved saturation voltage (200mV vs. 500mV), lower collector cutoff current (100nA vs. 10µA), higher DC current gain (300 vs. 85), and increased transition frequency (100MHz vs. 65MHz). These parameters indicate superior performance in switching speed and leakage characteristics.

Packaging Consideration: The primary distinction between BC368G and MMBT489LT1G is the mounting technology: BC368G uses through-hole TO-92 packaging, while MMBT489LT1G uses surface-mount SOT-23-3 packaging. This difference requires circuit board redesign and assembly process modification.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The BC368G is classified as obsolete, indicating discontinued manufacturing and limited availability. The MMBT489LT1G maintains active product status with onsemi, ensuring ongoing supply chain availability and manufacturing support.

Compliance and Certifications: The MMBT489LT1G is RoHS3 compliant, whereas the BC368G does not specify RoHS compliance status. Both parts are REACH unaffected and carry EAR99 ECCN classification. The MMBT489LT1G's RoHS3 compliance aligns with current regulatory requirements for electronic components in regulated markets.

Electrical Performance: All critical electrical parameters of the MMBT489LT1G meet or exceed the BC368G specifications. The substitute part demonstrates superior performance in saturation voltage, leakage current, current gain, and transition frequency, making it suitable for applications requiring the BC368G's electrical characteristics.

Packaging and Integration: Selection between BC368G and MMBT489LT1G depends on circuit board design constraints. Through-hole TO-92 packaging (BC368G) is suitable for legacy designs and manual assembly. Surface-mount SOT-23-3 packaging (MMBT489LT1G) is required for modern automated assembly processes and high-density PCB layouts. Circuit board redesign is necessary when transitioning from BC368G to MMBT489LT1G.

Frequently Asked Questions (FAQ)

Q: Can MMBT489LT1G directly replace BC368G in existing circuits?

A: Electrical substitution is valid. The MMBT489LT1G meets all electrical requirements of the BC368G with superior performance characteristics. However, physical package differences (through-hole TO-92 vs. surface-mount SOT-23-3) require circuit board redesign and assembly process modification. Pin configuration remains compatible (collector, base, emitter).

Q: What are the key electrical advantages of MMBT489LT1G over BC368G?

A: The MMBT489LT1G provides higher collector-emitter breakdown voltage (30 V vs. 20 V), lower saturation voltage (200mV vs. 500mV), significantly lower collector cutoff current (100nA vs. 10µA), higher DC current gain (300 vs. 85), and higher transition frequency (100MHz vs. 65MHz). These characteristics result in improved switching performance and reduced leakage.

Q: Are there compatibility concerns with the different package types?

A: Package type differences require circuit board layout modifications. BC368G uses through-hole TO-92 mounting for insertion into drilled PCB holes. MMBT489LT1G uses surface-mount SOT-23-3 pads on PCB surfaces. Electrical pin functions (collector, base, emitter) are identical, but physical placement and soldering methods differ.

Q: Does MMBT489LT1G meet current regulatory requirements?

A: Yes. MMBT489LT1G is RoHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic components. BC368G does not specify RoHS compliance status, which may present regulatory concerns for new product designs.

Q: What is the inventory status of these parts?

A: BC368G has 1050 pieces in stock but is classified as obsolete with no ongoing manufacturing. MMBT489LT1G has 39085 pieces in stock and maintains active product status, ensuring continued availability and supply chain reliability.

Q: Can BC368G be used in new product designs?

A: BC368G is not recommended for new designs due to obsolete status. MMBT489LT1G is the appropriate selection for new product development, offering active manufacturing status, regulatory compliance, and superior electrical performance.

Q: Are there thermal management differences between these parts?

A: Both parts operate across identical temperature ranges (-55°C ~ 150°C junction temperature). MMBT489LT1G has higher power dissipation capability (710 mW vs. 625 mW), providing additional thermal margin. Surface-mount SOT-23-3 packaging typically offers better thermal coupling to PCB compared to through-hole TO-92 in modern designs with thermal vias.