BCW66H-TP Equivalent & Substitute Parts

Part Overview

The BCW66H-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for interface applications requiring moderate current switching and signal amplification. This Surface Mount device operates at collector currents up to 800 mA with a collector-emitter breakdown voltage of 45 V and transition frequency of 100 MHz. The part is classified as Active product status with full REACH compliance. Substitute parts are identified to address packaging format preferences, inventory availability, or manufacturer sourcing requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

BCW66H-TP

Micro Commercial CoIn Stock: 744BCW66H-TP Datasheet

Current PartRFQ

BCW66GLT1G

onsemiIn Stock: 380337BCW66GLT1G Datasheet

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BCW66GLT3G

onsemiIn Stock: 10114BCW66GLT3G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BCW66H-TP with BCW66GLT1G or BCW66GLT3G is based on the following electrical and mechanical parameters that remain constant across all three parts:

• Transistor Type: NPN configuration maintained
• Maximum Collector Current: 800 mA across all variants
• Collector-Emitter Breakdown Voltage: 45 V specification identical
• Vce Saturation Characteristics: 700 mV @ 50 mA, 500 mA maintained
• Collector Cutoff Current: 20 nA specification consistent
• Transition Frequency: 100 MHz performance level preserved
• Operating Temperature Range: -55°C to 150°C (TJ) identical
• Package Configuration: TO-236-3 / SOT-23-3 form factor consistent
• Mounting Type: Surface Mount technology maintained

The substitute parts differ in manufacturer (onsemi versus Micro Commercial Co), packaging format (Tape & Reel versus Bulk), maximum power dissipation (300 mW versus 330 mW), and DC current gain specification (160 @ 100 mA, 1V versus 250 @ 100 mA, 1V). These differences do not preclude functional substitution in applications where the specified electrical parameters are met.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain Active product status, ensuring continued manufacturer support and availability. The BCW66H-TP and both onsemi substitutes (BCW66GLT1G and BCW66GLT3G) share identical REACH compliance status and EAR99 export classification, permitting direct substitution from a regulatory standpoint.

The onsemi variants BCW66GLT1G and BCW66GLT3G carry ROHS3 compliance certification and MSL Level 1 (Unlimited) moisture sensitivity rating, providing additional environmental and handling assurance. The BCW66H-TP does not specify these certifications in the provided data.

Selection between BCW66GLT1G and BCW66GLT3G depends on inventory requirements: BCW66GLT1G offers 380,300 pieces in stock, while BCW66GLT3G provides 10,100 pieces. Both are supplied in Tape & Reel format suitable for automated assembly processes.

The primary electrical difference is DC current gain specification: BCW66H-TP guarantees minimum 250 hFE at 100 mA and 1V, while both onsemi parts specify minimum 160 hFE under identical conditions. Applications requiring higher current gain should retain the BCW66H-TP. The maximum power dissipation difference (330 mW versus 300 mW) is marginal and does not restrict substitution in standard interface applications.

Frequently Asked Questions (FAQ)

Q: Can BCW66GLT1G or BCW66GLT3G directly replace BCW66H-TP in existing designs?

A: Direct substitution is supported for applications where the specified electrical parameters are met. The critical parameters—collector current (800 mA), breakdown voltage (45 V), saturation voltage (700 mV @ 50 mA, 500 mA), transition frequency (100 MHz), and operating temperature range (-55°C to 150°C)—are identical across all three parts. The lower DC current gain specification (160 versus 250 hFE) in the onsemi variants must be evaluated against circuit design margins.

Q: What is the difference between BCW66GLT1G and BCW66GLT3G?

A: Both parts are electrically and mechanically identical. The difference is inventory availability: BCW66GLT1G has 380,300 pieces in stock, while BCW66GLT3G has 10,100 pieces. Both are supplied by onsemi in Tape & Reel packaging format.

Q: Why does the BCW66H-TP specify 330 mW maximum power while the onsemi substitutes specify 300 mW?

A: The power dissipation difference reflects manufacturer specification variations for the same device class. Both ratings support the same electrical performance envelope. Applications operating below 300 mW dissipation experience no functional difference.

Q: Are the package dimensions identical between BCW66H-TP and the onsemi substitutes?

A: All three parts use the TO-236-3 / SOT-23-3 Surface Mount package configuration. Physical dimensions and PCB footprints are identical, permitting direct board-level substitution without layout modification.

Q: What is the significance of the ROHS3 compliance on the onsemi parts?

A: ROHS3 compliance indicates the onsemi variants meet Restriction of Hazardous Substances Directive requirements for lead-free and restricted substance content. This certification is relevant for applications subject to environmental regulations. The BCW66H-TP does not specify ROHS status in the provided data.

Q: Does the Moisture Sensitivity Level (MSL) rating affect substitution?

A: The onsemi parts carry MSL Level 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage or handling. The BCW66H-TP does not specify MSL in the provided data. For applications with strict moisture control requirements, the onsemi variants provide documented assurance.

Q: Which part should be selected for new designs?

A: Selection depends on specific design requirements. For applications requiring maximum DC current gain (250 hFE), retain BCW66H-TP. For designs compatible with 160 hFE minimum gain and requiring ROHS3 compliance or high inventory availability, BCW66GLT1G or BCW66GLT3G are suitable. All three parts support identical electrical performance in standard interface applications.