2SA2127-AE Equivalent & Substitute Parts

Part Overview

The 2SA2127-AE is a PNP bipolar junction transistor manufactured by onsemi, rated for 50 V collector-emitter breakdown voltage and 2 A maximum collector current. This component is designed for through-hole mounting in TO-226-3 and TO-92-3 long body packages. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity.

Substiute Parts

2SA2127-AE

onsemiIn Stock: 11412SA2127-AE Datasheet

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2SA2126-H

onsemiIn Stock: 9352SA2126-H Datasheet

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MPS751

Fairchild SemiconductorIn Stock: 1377MPS751 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2SA2127-AE is determined by the following critical parameters:

Primary Substitution Criteria:

• Transistor type must be PNP
• Collector-emitter breakdown voltage must be greater than or equal to 50 V
• Maximum collector current must be greater than or equal to 2 A
• Maximum power dissipation must be greater than or equal to 1 W
• Operating temperature range must support 150°C (TJ)
• Mounting type must be through-hole compatible

Secondary Compatibility Factors:

• DC current gain (hFE) characteristics
• Vce saturation voltage
• Transition frequency
• Package form factor compatibility

The 2SA2126-H and MPS751 satisfy the primary substitution criteria and are therefore classified as equivalent parts for the 2SA2127-AE.

Parameter Comparison

Engineering Selection Recommendations

2SA2126-H Substitution: The 2SA2126-H is an obsolete onsemi PNP transistor that meets all primary substitution criteria. It provides higher maximum collector current (3 A versus 2 A) and maintains identical DC current gain characteristics (200 @ 100mA, 2V). However, the 2SA2126-H features a different package form factor (TO-251-3 short leads versus TO-92-3 long body), which may require PCB layout modifications. Power dissipation is lower at 800 mW compared to 1 W. Transition frequency is slightly lower at 390 MHz versus 420 MHz. This part is suitable for applications where package compatibility can be accommodated.

MPS751 Substitution: The MPS751 is an active-status Fairchild Semiconductor PNP transistor that satisfies all primary substitution criteria. It maintains the same maximum collector current (2 A) and supports the same operating temperature (150°C). The MPS751 offers higher collector-emitter breakdown voltage (60 V versus 50 V), providing additional voltage margin. Package compatibility is direct with TO-92-3 form factor. However, the MPS751 exhibits lower DC current gain (75 @ 1A, 2V versus 200 @ 100mA, 2V) and significantly lower transition frequency (75 MHz versus 420 MHz). Power dissipation is lower at 625 mW. The active product status of the MPS751 provides long-term availability assurance.

Compliance and Certification: The 2SA2127-AE carries REACH Unaffected status and EAR99 export classification. The MPS751 maintains identical export classification (EAR99). The 2SA2126-H is ROHS3 compliant, whereas the 2SA2127-AE does not specify RoHS compliance. All three parts are suitable for applications requiring EAR99 classification.

Frequently Asked Questions (FAQ)

Q: Can the 2SA2126-H directly replace the 2SA2127-AE in existing PCB designs?

A: The 2SA2126-H is electrically compatible as a PNP transistor with equivalent voltage and current ratings. However, the package form factor differs (TO-251-3 short leads versus TO-92-3 long body), requiring PCB layout verification and potential rework of through-hole mounting positions.

Q: What is the primary advantage of selecting the MPS751 over the 2SA2126-H?

A: The MPS751 is an active-status product with confirmed long-term availability, whereas both the 2SA2127-AE and 2SA2126-H are classified as obsolete. The MPS751 also provides higher collector-emitter breakdown voltage (60 V) and direct TO-92-3 package compatibility with the original 2SA2127-AE.

Q: Are there frequency-dependent applications where the MPS751 is unsuitable?

A: Yes. The MPS751 transition frequency is 75 MHz, significantly lower than the 2SA2127-AE (420 MHz) and 2SA2126-H (390 MHz). Applications requiring high-frequency switching or RF performance should retain the 2SA2127-AE or use the 2SA2126-H. The MPS751 is suitable for low-frequency switching and audio applications.

Q: What is the impact of lower DC current gain in the MPS751?

A: The MPS751 exhibits a minimum DC current gain of 75 @ 1A, 2V, compared to 200 @ 100mA, 2V for the 2SA2127-AE. This requires higher base current to achieve equivalent collector current levels. Circuit designs must account for increased base drive requirements when substituting with the MPS751.

Q: Can the 2SA2126-H be used in applications requiring 1 W power dissipation?

A: The 2SA2126-H is rated for 800 mW maximum power dissipation, which is below the 1 W specification of the 2SA2127-AE. Applications requiring sustained 1 W dissipation should not use the 2SA2126-H without thermal analysis confirming operation within safe limits.

Q: Are all three parts suitable for 150°C operating temperature applications?

A: Yes. The 2SA2127-AE, 2SA2126-H, and MPS751 all support maximum junction temperature (TJ) of 150°C, making them suitable for high-temperature environments within this specification.

Q: What packaging considerations apply when substituting these parts?

A: The 2SA2127-AE and MPS751 both use TO-92-3 package form factor, enabling direct physical substitution. The 2SA2126-H uses TO-251-3 short leads (IPak), requiring PCB redesign for mounting compatibility. Verify lead spacing and through-hole positioning before implementing the 2SA2126-H substitution.