BC857CT-TP Equivalent & Substitute Parts

Part Overview

The BC857CT-TP is an active PNP bipolar junction transistor manufactured by Micro Commercial Co, designed for interface applications in surface mount configurations. This component operates at a maximum collector current of 100 mA with a collector-emitter breakdown voltage of 45 V and a transition frequency of 100 MHz. The device is packaged in SOT-523 surface mount form factor with a maximum power dissipation of 150 mW and operates across a temperature range of -55°C to 150°C.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for the application circuit.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Frequency - Transition	100	MHz
Power - Max	150	mW
Mounting Type	Surface Mount	—
Package / Case	SOT-523	—
Operating Temperature Range	-55 to 150	°C
Product Status	Active	—

Substitute Part Grouping Explanation

Substitution eligibility for the BC857CT-TP is determined by the following critical parameters:

Electrical Compatibility Requirements:

Transistor type must be PNP
Collector current rating must be equal to or greater than 100 mA
Collector-emitter breakdown voltage must be equal to or greater than 45 V
Transition frequency must be equal to or greater than 100 MHz
Operating temperature range must encompass or exceed -55°C to 150°C

Mechanical Compatibility Requirements:

Package type must be SOT-523 or equivalent surface mount form factor
Mounting type must be surface mount

The CMUT5087E TR PBFREE meets these substitution criteria with equivalent or superior electrical ratings and compatible packaging specifications.

Parameter Comparison

Parameter	BC857CT-TP	CMUT5087E TR PBFREE	Unit
Manufacturer	Micro Commercial Co	Central Semiconductor Corp	—
Transistor Type	PNP	PNP	—
Current - Collector (Ic) Max	100	100	mA
Voltage - Collector Emitter Breakdown (Max)	45	50	V
Vce Saturation (Max)	650 mV @ 5 mA, 100 mA	225 mV @ 10 mA, 100 mA	V
Current - Collector Cutoff (Max)	15	50	nA
DC Current Gain (hFE) Min	420 @ 2 mA, 5 V	390 @ 100 µA, 5 V	—
Power - Max	150	350	mW
Frequency - Transition	100	100	MHz
Operating Temperature Range	-55 to 150	-65 to 150	°C
Mounting Type	Surface Mount	Surface Mount	—
Package / Case	SOT-523	SOT-523	—
Product Status	Active	Active	—

Engineering Selection Recommendations

Both the BC857CT-TP and CMUT5087E TR PBFREE are active products with equivalent electrical performance in the critical parameters of collector current, transition frequency, and package form factor. The CMUT5087E TR PBFREE provides superior ratings in collector-emitter breakdown voltage (50 V versus 45 V) and maximum power dissipation (350 mW versus 150 mW), making it suitable for applications requiring higher voltage or power margins.

The CMUT5087E TR PBFREE carries RoHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) designation, indicating enhanced environmental and handling characteristics. Both devices are REACH Unaffected and classified under ECCN EAR99.

The BC857CT-TP is supplied in bulk packaging, while the CMUT5087E TR PBFREE is supplied in tape and reel format, which may influence procurement and assembly considerations.

Frequently Asked Questions (FAQ)

Q: Can the CMUT5087E TR PBFREE directly replace the BC857CT-TP in existing designs?

A: Yes. Both devices are PNP transistors with identical collector current ratings (100 mA), matching transition frequency (100 MHz), and compatible SOT-523 surface mount packaging. The CMUT5087E TR PBFREE meets or exceeds all critical electrical parameters of the BC857CT-TP.

Q: What are the differences in saturation voltage between these parts?

A: The BC857CT-TP exhibits a maximum Vce saturation of 650 mV at 5 mA and 100 mA collector current. The CMUT5087E TR PBFREE exhibits a maximum Vce saturation of 225 mV at 10 mA and 100 mA collector current. Lower saturation voltage in the CMUT5087E TR PBFREE may reduce power dissipation in switching applications.

Q: Are there temperature range differences?

A: The BC857CT-TP operates from -55°C to 150°C. The CMUT5087E TR PBFREE operates from -65°C to 150°C, providing an extended lower temperature operating range.

Q: What is the significance of the packaging difference (bulk versus tape and reel)?

A: Bulk packaging is suitable for manual assembly or small-volume applications. Tape and reel packaging is optimized for automated pick-and-place assembly processes. The electrical and mechanical specifications remain identical; packaging format affects procurement and assembly workflow only.

Q: Are both parts RoHS compliant?

A: The BC857CT-TP lists REACH Unaffected status. The CMUT5087E TR PBFREE is RoHS3 Compliant with REACH Unaffected status, indicating full compliance with current environmental regulations.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: The BC857CT-TP does not specify an MSL rating in the provided data. The CMUT5087E TR PBFREE is rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

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