2SA2127 Equivalent & Substitute Parts

Part Overview

The 2SA2127 is an obsolete PNP bipolar junction transistor manufactured by onsemi, rated for 50V collector-emitter breakdown voltage and 2A maximum collector current. Designed for through-hole mounting in 3-MP package configuration, this component was utilized in applications requiring moderate power dissipation and switching frequencies up to 420MHz. Due to its obsolete product status, equivalent substitute parts are necessary for ongoing production, maintenance, and design continuity in legacy systems.

Substiute Parts

2SA2127

onsemiIn Stock: 9502SA2127 Datasheet

Current PartRFQ

2SA2126-H

onsemiIn Stock: 9352SA2126-H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2SA2127 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Transistor polarity: PNP configuration required
• Voltage rating: Minimum 50V collector-emitter breakdown voltage
• Current capability: Minimum 2A collector current rating
• Power dissipation: Minimum 1W rating
• Frequency response: Transition frequency of 420MHz or higher
• DC current gain: Minimum hFE of 200 at specified test conditions
• Saturation voltage: Maximum 400mV at specified bias conditions
• Operating temperature: Maximum junction temperature of 150°C or higher
• Mounting configuration: Through-hole package type
• Package compatibility: TO-226-3 or TO-92-3 Long Body form factor

The 2SA2126-H qualifies as a substitute based on meeting or exceeding all critical electrical parameters while maintaining through-hole mounting compatibility.

Parameter Comparison

Engineering Selection Recommendations

The 2SA2127 is classified as obsolete, necessitating component substitution for continued system support. The 2SA2126-H provides electrical compatibility as a PNP transistor with matching voltage and current gain specifications. Both components maintain identical REACH compliance status and export classification (EAR99).

Substitution Considerations:

The 2SA2126-H exceeds the collector current specification (3A versus 2A) and maintains matching DC current gain characteristics. However, the substitute exhibits a lower maximum power rating (800mW versus 1W) and reduced transition frequency (390MHz versus 420MHz). The 2SA2126-H utilizes a different package configuration (TO-251-3 Short Leads/IPak versus TO-226-3/TO-92-3 Long Body), requiring physical board layout modifications and potential PCB redesign for mounting compatibility.

Both components maintain identical operating temperature ratings (150°C junction temperature) and collector cutoff current specifications. The 2SA2126-H carries RoHS3 compliance certification, whereas the 2SA2127 compliance status is not specified in available documentation.

Frequently Asked Questions (FAQ)

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

A: Direct pin-for-pin replacement is not possible due to package configuration differences. The 2SA2127 uses TO-226-3 or TO-92-3 Long Body through-hole packages, while the 2SA2126-H uses TO-251-3 Short Leads (IPak) configuration. PCB layout modifications are required for mechanical mounting compatibility.

Q: What are the electrical limitations when substituting the 2SA2126-H for the 2SA2127?

A: The 2SA2126-H provides higher collector current capability (3A versus 2A) and maintains matching DC current gain (200 @ 100mA, 2V). However, the maximum power dissipation is reduced (800mW versus 1W), and the transition frequency is lower (390MHz versus 420MHz). Applications requiring the full 1W power rating or 420MHz frequency response may require alternative evaluation.

Q: Are there compliance or regulatory differences between these components?

A: Both components maintain identical REACH compliance status (REACH Unaffected) and export classification (EAR99). The 2SA2126-H carries RoHS3 compliance certification. Both components are classified as obsolete products.

Q: What is the significance of the different Vce saturation test conditions?

A: The 2SA2127 specifies saturation voltage at 400mV (50mA base current, 1A collector current), while the 2SA2126-H specifies 520mV (100mA base current, 2A collector current). These measurements occur at different bias points and cannot be directly compared. Application-specific saturation voltage requirements must be evaluated against the actual operating conditions in the target circuit.

Q: Does the higher collector current rating of the 2SA2126-H create compatibility issues?

A: The 3A collector current rating of the 2SA2126-H exceeds the 2A requirement of the 2SA2127. This provides design margin for current handling but does not create incompatibility. The substitute can safely operate at or below the original component's current specifications.

Q: What packaging considerations apply to this substitution?

A: The 2SA2127 through-hole packages (TO-226-3 Long Body, TO-92-3 Long Body) differ significantly from the 2SA2126-H IPak configuration (TO-251-3 Short Leads). Lead spacing, mounting hole requirements, and thermal characteristics differ between package types. Physical board redesign is necessary for mechanical compatibility.