CMPTH81 BK Equivalent & Substitute Parts

Part Overview

The CMPTH81 BK is an RF transistor manufactured by Central Semiconductor Corp, classified as a PNP bipolar junction transistor (BJT) designed for radio frequency applications. This component operates at a transition frequency of 600MHz with a maximum collector-emitter breakdown voltage of 20V and maximum power dissipation of 225mW in a surface mount SOT-23 package.

The CMPTH81 BK is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	20	V
Frequency - Transition	600	MHz
Power - Max	225	mW
DC Current Gain (hFE) (Min) @ Ic, Vce	60 @ 5mA, 10V	—
Current - Collector (Ic) (Max)	50	mA
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CMPTH81 BK is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Criteria:

Transistor type must be PNP
Voltage - Collector Emitter Breakdown (Max) must equal or exceed 20V
Frequency - Transition must equal or exceed 600MHz
Power - Max must equal or exceed 225mW
DC Current Gain (hFE) (Min) @ Ic, Vce must equal or exceed 60 @ 5mA, 10V
Current - Collector (Ic) (Max) must equal or exceed 50mA
Operating Temperature Range must encompass -55°C to 150°C (TJ)
Package / Case must be compatible with TO-236-3, SC-59, or SOT-23-3
Mounting Type must be Surface Mount

The MMBTH81 manufactured by onsemi meets all specified electrical and mechanical parameters and is identified as a direct substitute for the CMPTH81 BK.

Parameter Comparison

Parameter	CMPTH81 BK (Central Semiconductor)	MMBTH81 (onsemi)	Match Status
Transistor Type	PNP	PNP	Equivalent
Voltage - Collector Emitter Breakdown (Max)	20V	20V	Equivalent
Frequency - Transition	600MHz	600MHz	Equivalent
Power - Max	225mW	225mW	Equivalent
DC Current Gain (hFE) (Min) @ Ic, Vce	60 @ 5mA, 10V	60 @ 5mA, 10V	Equivalent
Current - Collector (Ic) (Max)	50mA	50mA	Equivalent
Operating Temperature Range	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	Equivalent
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent
Product Status	Obsolete	Active	Substitute is Active

Engineering Selection Recommendations

The MMBTH81 manufactured by onsemi is the direct equivalent substitute for the CMPTH81 BK. Selection of the MMBTH81 is supported by the following factors:

Product Status: The MMBTH81 is listed as Active, ensuring ongoing availability and supply chain continuity compared to the obsolete CMPTH81 BK.

Compliance and Certifications: The MMBTH81 is ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements for electronic components in industrial and commercial applications.

Electrical and Mechanical Equivalence: All critical parameters—including transistor type, voltage rating, frequency response, power dissipation, current gain, collector current, operating temperature range, and package specifications—are identical between the CMPTH81 BK and MMBTH81.

Packaging and Handling: Both components share identical moisture sensitivity classification (MSL 1, Unlimited), eliminating additional handling or storage considerations during substitution.

The MMBTH81 is suitable for direct replacement in applications previously designed with the CMPTH81 BK without circuit modification or re-qualification.

Frequently Asked Questions (FAQ)

Q: Can the MMBTH81 be used as a direct replacement for the CMPTH81 BK without circuit modifications?

A: Yes. The MMBTH81 is electrically and mechanically equivalent to the CMPTH81 BK across all specified parameters. Direct substitution is supported without circuit redesign.

Q: What is the primary reason for substituting the CMPTH81 BK?

A: The CMPTH81 BK is obsolete. The MMBTH81 is an active product with equivalent specifications and assured supply availability.

Q: Are the package specifications identical between these two parts?

A: Yes. Both the CMPTH81 BK and MMBTH81 use the TO-236-3, SC-59, SOT-23-3 surface mount package with identical pin configurations and footprints.

Q: Do the CMPTH81 BK and MMBTH81 have different moisture sensitivity requirements?

A: No. Both components are classified as MSL 1 (Unlimited), indicating identical moisture sensitivity and storage requirements.

Q: What compliance certifications does the MMBTH81 carry?

A: The MMBTH81 is ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory standards for electronic components.

Q: Are there any differences in operating temperature range between these parts?

A: No. Both components operate across the identical temperature range of -55°C to 150°C (TJ).

Q: Can the MMBTH81 handle the same RF frequency applications as the CMPTH81 BK?

A: Yes. Both components have a transition frequency of 600MHz and are suitable for identical RF applications.

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