MPSA13G NPN Darlington Transistor Equivalent & Substitute Parts

Part Overview

The MPSA13G is an NPN Darlington bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. It features a 30 V collector-emitter breakdown voltage, 500 mA maximum collector current, and 625 mW power dissipation in a Through Hole TO-92 package.

The MPSA13G is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production and repair requirements for legacy systems utilizing this transistor.

Substiute Parts

MPSA13G

onsemiIn Stock: 18234MPSA13G Datasheet

Current PartRFQ

KSP13BU

onsemiIn Stock: 105188KSP13BU Datasheet

DirectRFQ

MMBTA13LT1G

onsemiIn Stock: 152300MMBTA13LT1G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MPSA13G are identified based on electrical and mechanical parameter compatibility. The primary substitution criteria are:

Electrical Parameters:

• Transistor type: NPN - Darlington configuration
• Maximum collector current: 500 mA or greater
• Collector-emitter breakdown voltage: 30 V or greater
• Vce saturation characteristics: 1.5 V @ 100 µA, 100 mA
• DC current gain (hFE): 10000 minimum @ 100 mA, 5 V
• Transition frequency: 125 MHz or greater

Mechanical Parameters:

• Mounting type: Through Hole or Surface Mount
• Package compatibility: TO-92-3 (Through Hole) or SOT-23-3 (Surface Mount)

Substitutes are classified into two categories:

Direct Substitute (Identical Electrical & Mechanical): KSP13BU maintains all electrical specifications and uses the same Through Hole TO-92-3 package, providing pin-for-pin compatibility.

Similar Substitute (Electrical Compatibility with Package Variation): MMBTA13LT1G meets all electrical specifications but uses a Surface Mount SOT-23-3 package and has a reduced maximum collector current of 300 mA and power dissipation of 225 mW. This part is suitable for applications where collector current does not exceed 300 mA and surface mount technology is acceptable.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Pin-for-Pin Compatible):

Select KSP13BU when the design requires Through Hole mounting and full electrical equivalence to the MPSA13G. The KSP13BU is an active product with ROHS3 compliance, providing long-term availability and regulatory alignment. All electrical parameters, including maximum collector current (500 mA) and power dissipation (625 mW), are identical to the MPSA13G. The TO-92-3 package footprint is mechanically compatible with existing PCB layouts designed for the MPSA13G.

For Surface Mount Applications:

Select MMBTA13LT1G when the design permits Surface Mount technology and collector current requirements do not exceed 300 mA. The MMBTA13LT1G maintains electrical equivalence in all critical parameters (Vce saturation, DC current gain, transition frequency, collector-emitter breakdown voltage) and is an active product with ROHS3 compliance. The reduced maximum collector current (300 mA) and power dissipation (225 mW) must be verified against circuit requirements before selection. The SOT-23-3 package requires PCB layout modification.

Both substitute parts are manufactured by onsemi, carry REACH Unaffected status, and are classified under ECCN EAR99 and HTSUS 8541.21.0075, matching the regulatory classification of the MPSA13G.

Frequently Asked Questions (FAQ)

Q: Can KSP13BU be used as a direct replacement for MPSA13G without PCB modification?

A: Yes. The KSP13BU is electrically and mechanically equivalent to the MPSA13G. Both use the TO-92-3 Through Hole package with identical pin configuration. No PCB layout changes are required.

Q: What is the primary difference between KSP13BU and MMBTA13LT1G?

A: The primary differences are mounting type and current rating. KSP13BU is a Through Hole device with 500 mA maximum collector current, while MMBTA13LT1G is a Surface Mount device with 300 mA maximum collector current. Both maintain identical electrical characteristics for voltage, gain, and saturation parameters.

Q: Can MMBTA13LT1G replace MPSA13G in all applications?

A: MMBTA13LT1G can replace MPSA13G only in applications where collector current does not exceed 300 mA and power dissipation does not exceed 225 mW. Additionally, the design must accommodate Surface Mount technology. Verify circuit current requirements before substitution.

Q: Why is MPSA13G listed as obsolete?

A: The MPSA13G is classified as obsolete by the manufacturer. Active equivalent products (KSP13BU and MMBTA13LT1G) are available to support ongoing production and design requirements.

Q: Are there compliance or regulatory differences between the three parts?

A: KSP13BU and MMBTA13LT1G are both ROHS3 compliant active products. All three parts carry REACH Unaffected status and are classified under the same ECCN and HTSUS codes, indicating regulatory equivalence.

Q: What is the operating temperature range for each part?

A: MPSA13G and MMBTA13LT1G both operate from -55°C to 150°C. KSP13BU operates up to 150°C; the lower temperature limit is not specified in available documentation.

Q: Can these parts be used interchangeably in existing designs?

A: KSP13BU provides direct interchangeability with MPSA13G. MMBTA13LT1G requires design review to confirm current and power requirements are within its reduced ratings and that Surface Mount technology is acceptable for the application.