BCP54_L99Z Equivalent & Substitute Parts

Part Overview

The BCP54_L99Z is an NPN bipolar junction transistor manufactured by onsemi, rated for 45 V collector-emitter breakdown voltage and 1.5 A maximum collector current in a surface mount SOT-223-4 package. This device is classified as obsolete, indicating it has been discontinued by the manufacturer. Finding equivalent or substitute parts is necessary to support ongoing production requirements, maintenance operations, and design continuity for applications currently utilizing this component.

Key Parameters

Parameter	Value
Transistor Type	NPN
Current - Collector (Ic) (Max)	1.5 A
Voltage - Collector Emitter Breakdown (Max)	45 V
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 150mA, 2V
Power - Max	1.5 W
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-261-4, TO-261AA
Supplier Device Package	SOT-223-4

Substitute Part Grouping Explanation

Substitution of the BCP54_L99Z is determined by electrical and mechanical parameter equivalence. The critical parameters that define substitutability are:

Transistor Type: NPN configuration
Current Rating: Maximum collector current of 1.5 A
Voltage Rating: Collector-emitter breakdown voltage of 45 V
Saturation Characteristics: Vce saturation of 500mV at specified base and collector currents
Current Gain: DC current gain (hFE) minimum of 40 at 150mA collector current and 2V Vce
Power Dissipation: Maximum power rating of 1.5 W
Temperature Range: Operating junction temperature from -55°C to 150°C
Package: SOT-223-4 surface mount package (TO-261-4, TO-261AA case)

Parts meeting all these electrical and mechanical specifications are classified as direct equivalents and may be substituted without circuit redesign.

Parameter Comparison

Parameter	BCP54_L99Z (Main Part)	BCP54 (Substitute)
Manufacturer	onsemi	onsemi
Transistor Type	NPN	NPN
Current - Collector (Ic) (Max)	1.5 A	1.5 A
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100nA (ICBO)	100nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 150mA, 2V	40 @ 150mA, 2V
Power - Max	1.5 W	1.5 W
Operating Temperature	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount	Surface Mount
Package / Case	TO-261-4, TO-261AA	TO-261-4, TO-261AA
Supplier Device Package	SOT-223-4	SOT-223-4
Product Status	Obsolete	Active
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99
HTSUS	8541.29.0095	8541.29.0095

Engineering Selection Recommendations

The BCP54 (base part number without the _L99Z suffix) is a direct electrical and mechanical equivalent to the BCP54_L99Z. The primary distinction is product status: BCP54_L99Z is obsolete, while BCP54 maintains active production status. The BCP54 substitute is manufactured by onsemi and carries identical electrical specifications, package configuration, and regulatory compliance certifications.

For applications currently using BCP54_L99Z, the BCP54 in SOT-223-4 packaging provides full compatibility without circuit modification. The substitute part is available in higher inventory quantities (85,400 pieces) compared to the obsolete variant (1,013 pieces), supporting long-term supply chain stability. Both parts maintain REACH Unaffected status and EAR99 export classification.

The BCP54 substitute is RoHS3 compliant, providing enhanced environmental compliance for new designs and production runs.

Frequently Asked Questions (FAQ)

Q: Can BCP54 directly replace BCP54_L99Z in existing circuits?

A: Yes. The BCP54 is electrically and mechanically identical to BCP54_L99Z. All electrical parameters, including current ratings, voltage ratings, saturation characteristics, and current gain specifications, are equivalent. The SOT-223-4 package dimensions and pin configuration are identical, allowing direct substitution without circuit redesign or PCB layout modification.

Q: What is the difference between BCP54_L99Z and BCP54?

A: The primary difference is product status. BCP54_L99Z is classified as obsolete and no longer manufactured. BCP54 is an active product with ongoing production. The _L99Z suffix on the obsolete part typically indicates a specific manufacturing lot or variant designation. Electrically and mechanically, both parts are equivalent.

Q: Are there any compliance or certification differences between the two parts?

A: Both parts share identical REACH status (REACH Unaffected) and ECCN classification (EAR99). The BCP54 substitute includes RoHS3 compliance certification, which the BCP54_L99Z does not explicitly list. This makes BCP54 suitable for applications requiring enhanced environmental compliance standards.

Q: What packaging options are available for the BCP54 substitute?

A: The BCP54 substitute is supplied in Cut Tape (CT) and Digi-Reel® packaging formats, supporting both manual assembly and automated reel-fed production processes. The component package remains SOT-223-4 (TO-261-4, TO-261AA case) in all supply formats.

Q: Is the BCP54 substitute available in sufficient quantities for production?

A: Yes. The BCP54 substitute has 85,400 pieces in current inventory, providing substantial availability for production requirements. This represents a significant supply advantage over the obsolete BCP54_L99Z variant, which has limited remaining stock of 1,013 pieces.

Q: Can the BCP54 be used in high-temperature applications?

A: Yes. The BCP54 maintains the same operating temperature range as BCP54_L99Z: -55°C to 150°C junction temperature. This supports applications requiring extended temperature operation within the specified range.

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