MPSH81 Equivalent & Substitute Parts

Part Overview

The MPSH81 is an RF transistor with PNP polarity manufactured by onsemi, designed for radio frequency applications requiring 20V collector-emitter breakdown voltage and 600MHz transition frequency. This component is packaged in a Through Hole TO-92-3 configuration and rated for 350mW maximum power dissipation with 50mA maximum collector current.

The MPSH81 carries an Obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this RF transistor.

Substiute Parts

MPSH81

onsemiIn Stock: 887MPSH81 Datasheet

Current PartRFQ

MMBTH81

onsemiIn Stock: 15492MMBTH81 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MPSH81 is determined by electrical and mechanical parameter compatibility. The following criteria establish valid substitution:

Electrical Parameters (Must Match):

• Transistor Type: PNP
• Voltage - Collector Emitter Breakdown (Max): 20V
• Frequency - Transition: 600MHz
• Current - Collector (Ic) (Max): 50mA
• DC Current Gain (hFE) (Min) @ Ic, Vce: 60 @ 5mA, 10V
• Operating Temperature Range: -55°C to 150°C (TJ)

Mechanical Parameters (Functional Equivalence):

• Package / Case: TO-92-3 or equivalent surface mount alternative with identical electrical performance

The MMBTH81 satisfies all electrical parameter requirements and operates within the same temperature range. While the MMBTH81 utilizes a surface mount SOT-23-3 package instead of Through Hole TO-92-3, it maintains electrical equivalence through identical transistor specifications. The power rating difference (225mW vs. 350mW) reflects package thermal characteristics and does not affect functional substitution in applications within the 225mW thermal envelope.

Parameter Comparison

Engineering Selection Recommendations

MMBTH81 as Primary Substitute:

The MMBTH81 is the direct electrical equivalent of the MPSH81 for RF transistor applications. All critical electrical parameters—polarity, voltage rating, frequency response, current capacity, and gain characteristics—are identical. Both components operate across the same temperature range and maintain equivalent moisture sensitivity classification.

The MMBTH81 carries Active product status from onsemi, ensuring ongoing availability and supply chain support. This addresses the primary limitation of the obsolete MPSH81. The component is RoHS3 compliant, providing regulatory alignment for modern manufacturing environments.

Package Consideration:

The MMBTH81 utilizes surface mount SOT-23-3 packaging, whereas the MPSH81 uses Through Hole TO-92-3 packaging. This difference requires PCB layout modification and assembly process adjustment. Applications requiring Through Hole mounting must evaluate alternative solutions or implement surface mount assembly capabilities.

The power rating difference (225mW vs. 350mW) reflects thermal dissipation capability of the respective packages. Applications operating within 225mW power envelope experience no functional limitation. Applications requiring sustained power dissipation above 225mW must remain on Through Hole solutions or implement thermal management modifications for surface mount alternatives.

Frequently Asked Questions (FAQ)

Q: Can the MMBTH81 directly replace the MPSH81 in existing PCB designs?

A: Electrical substitution is valid. However, PCB layout modification is required due to package differences. The MPSH81 uses Through Hole TO-92-3 mounting, while the MMBTH81 uses surface mount SOT-23-3 mounting. Existing Through Hole footprints cannot accommodate the MMBTH81 without PCB redesign.

Q: Are the electrical characteristics identical between MPSH81 and MMBTH81?

A: Yes. Both components share identical transistor type (PNP), voltage rating (20V), frequency response (600MHz), current capacity (50mA), and DC current gain (60 @ 5mA, 10V). Operating temperature ranges are identical (-55°C to 150°C).

Q: What is the significance of the power rating difference (350mW vs. 225mW)?

A: The power rating reflects the thermal dissipation capability of each package. The Through Hole TO-92-3 package (MPSH81) dissipates 350mW, while the surface mount SOT-23-3 package (MMBTH81) dissipates 225mW. Applications operating within the 225mW envelope experience no functional impact. Higher power applications require Through Hole solutions.

Q: Is the MMBTH81 available in the same packaging format as the MPSH81?

A: No. The MMBTH81 is available in Cut Tape (CT) and Digi-Reel® surface mount packaging. The MPSH81 was supplied in Through Hole format. Assembly process and PCB design must accommodate surface mount technology for MMBTH81 implementation.

Q: What is the product status difference, and why does it matter?

A: The MPSH81 is Obsolete, indicating discontinued manufacturing and limited availability. The MMBTH81 is Active, ensuring ongoing production, supply chain availability, and manufacturer support. Active status is critical for long-term design sustainability.

Q: Are compliance certifications equivalent between the two parts?

A: Yes. Both components are REACH Unaffected and carry identical Moisture Sensitivity Level (MSL) classification of 1 (Unlimited). The MMBTH81 is additionally RoHS3 compliant, providing enhanced regulatory alignment for modern manufacturing standards.

Q: Can applications designed for MPSH81 operate with MMBTH81 without circuit modification?

A: Circuit modification is not required if power dissipation remains within 225mW. PCB layout and assembly process modifications are mandatory due to package differences. Electrical circuit operation remains unchanged.