MPSA64G PNP Darlington Transistor Equivalent & Substitute Parts

Part Overview

The MPSA64G is a PNP Darlington bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 500 mA, collector-emitter breakdown voltage of 30 V, and operates across a temperature range of -55°C to 150°C. The MPSA64G is packaged in a through-hole TO-92 (TO-226-3) configuration with a maximum power dissipation of 625 mW.

The MPSA64G is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to support ongoing maintenance, repair, and redesign efforts for legacy systems and applications where this component is currently deployed.

Substiute Parts

MPSA64G

onsemiIn Stock: 809MPSA64G Datasheet

Current PartRFQ

MMBTA64LT1G

onsemiIn Stock: 23209MMBTA64LT1G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MPSA64G is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Transistor type must be PNP - Darlington configuration
• Maximum collector current (Ic) must be 500 mA or greater
• Collector-emitter breakdown voltage (VCEO) must be 30 V or greater
• Vce saturation must not exceed 1.5 V at specified bias conditions (100µA, 100mA)
• DC current gain (hFE) minimum must be 20000 or greater at 100mA, 5V
• Transition frequency must be 125 MHz or greater
• Operating temperature range must encompass -55°C to 150°C

Mechanical Compatibility Criteria:

• Package type must be compatible with the application's mounting requirements (through-hole or surface-mount)
• Pinout configuration must match TO-92 or equivalent three-terminal Darlington topology

The MMBTA64LT1G meets all electrical equivalence criteria but differs in mounting type (surface-mount SOT-23-3 versus through-hole TO-92). This substitute is electrically compatible but requires PCB layout and assembly process modifications.

Parameter Comparison

Engineering Selection Recommendations

MMBTA64LT1G as Primary Substitute:

The MMBTA64LT1G is the direct electrical equivalent of the MPSA64G, manufactured by the same supplier (onsemi) and maintaining identical electrical specifications across all critical parameters. The substitute part is classified as Active product status, ensuring ongoing availability and supply chain continuity compared to the obsolete MPSA64G.

The MMBTA64LT1G carries RoHS3 compliance certification, meeting current environmental and regulatory standards. Both parts maintain MSL 1 (Unlimited) moisture sensitivity classification and REACH Unaffected status.

Mounting Type Consideration:

The primary distinction between these parts is the package configuration. The MPSA64G uses through-hole TO-92 mounting, while the MMBTA64LT1G uses surface-mount SOT-23-3 packaging. Selection between these parts depends on the application's PCB assembly process and mechanical mounting requirements. The MMBTA64LT1G's reduced maximum power dissipation (225 mW versus 625 mW) reflects the thermal characteristics of the smaller surface-mount package and must be evaluated against application thermal demands.

Compliance and Availability:

For new designs or redesigns, the MMBTA64LT1G is the recommended selection due to its active product status and modern compliance certifications. For through-hole applications requiring direct pin-compatible replacement, the MPSA64G remains the specified part, though long-term availability may be limited due to obsolete status.

Frequently Asked Questions (FAQ)

Q: Can the MMBTA64LT1G directly replace the MPSA64G in existing through-hole PCB designs?

A: The MMBTA64LT1G cannot be directly soldered into through-hole pads designed for the TO-92 package. The MMBTA64LT1G uses SOT-23-3 surface-mount packaging with different lead geometry and spacing. PCB layout modification and assembly process changes are required. For through-hole applications, the MPSA64G remains the specified component.

Q: Are the electrical characteristics identical between MPSA64G and MMBTA64LT1G?

A: Yes. Both parts share identical electrical specifications for collector current (500 mA), collector-emitter breakdown voltage (30 V), saturation voltage (1.5 V), current gain (20000 minimum), and transition frequency (125 MHz). Operating temperature range is also identical (-55°C to 150°C).

Q: What is the significance of the power rating difference (625 mW versus 225 mW)?

A: The power rating difference reflects the thermal dissipation capability of each package type. The TO-92 through-hole package (MPSA64G) can dissipate 625 mW, while the smaller SOT-23-3 surface-mount package (MMBTA64LT1G) is rated for 225 mW. Applications requiring sustained power dissipation above 225 mW must use the MPSA64G or select an alternative package with higher thermal capability.

Q: Why is the MPSA64G classified as obsolete?

A: The MPSA64G is an older through-hole component. onsemi has transitioned this product line to surface-mount alternatives such as the MMBTA64LT1G to align with modern manufacturing processes and market demand for compact, automated assembly solutions.

Q: Can I use the MMBTA64LT1G in a new design if the original application used MPSA64G?

A: Yes, provided the application's PCB design accommodates surface-mount SOT-23-3 packaging and the thermal requirements do not exceed 225 mW continuous dissipation. The electrical performance is equivalent. Verify that the application's thermal environment and power budget align with the MMBTA64LT1G's specifications.

Q: What compliance certifications apply to both parts?

A: Both the MPSA64G and MMBTA64LT1G carry MSL 1 (Unlimited) moisture sensitivity classification and REACH Unaffected status. The MMBTA64LT1G additionally carries RoHS3 compliance certification, reflecting its active product status and alignment with current environmental regulations.

Q: Are there any pinout differences between MPSA64G and MMBTA64LT1G?

A: Both parts are three-terminal PNP Darlington transistors with identical functional pinout (Base, Collector, Emitter). Physical lead geometry and spacing differ due to package type differences (TO-92 versus SOT-23-3), but the electrical function of each terminal is equivalent.