2SA2126-H Equivalent & Substitute Parts

Part Overview

The 2SA2126-H is an obsolete PNP bipolar junction transistor manufactured by onsemi, rated for 50V collector-emitter breakdown voltage and 3A maximum collector current. This through-hole mounted device operates at a maximum junction temperature of 150°C with 800mW power dissipation capability and 390MHz transition frequency. Due to its obsolete product status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and component sourcing in applications requiring PNP transistor functionality within specified electrical and mechanical parameters.

Substiute Parts

2SA2126-H

onsemiIn Stock: 9352SA2126-H Datasheet

Current PartRFQ

NJD1718T4G

onsemiIn Stock: 2407NJD1718T4G Datasheet

MFR RecommendedRFQ

2SB1201T-E

onsemiIn Stock: 7342SB1201T-E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2SA2126-H is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Transistor type must be PNP
• Voltage - Collector Emitter Breakdown (Max) must equal or exceed 50V
• Current - Collector (Ic) (Max) must equal or exceed application requirements
• Power dissipation capability must support circuit operation
• Mounting type and package compatibility with PCB design
• RoHS3 compliance for regulatory alignment

Substitute Classification:

The NJD1718T4G is classified as a manufacturer-recommended substitute. This part maintains the 50V breakdown voltage specification and PNP transistor type. However, it operates as a surface-mount device in DPAK package with reduced maximum collector current (2A versus 3A) and lower transition frequency (80MHz versus 390MHz). The NJD1718T4G is active product status with higher power dissipation capability (1.68W).

The 2SB1201T-E is classified as a similar substitute. This part maintains through-hole mounting in the same TO-251-3 package as the 2SA2126-H, operates at 50V breakdown voltage, and shares PNP transistor type. Maximum collector current is reduced to 2A, transition frequency is 150MHz, and power dissipation remains at 800mW. The 2SB1201T-E is active product status.

Parameter Comparison

Engineering Selection Recommendations

For Through-Hole PCB Designs:

The 2SB1201T-E is the appropriate selection when PCB layout requires through-hole mounting in the TO-251-3 package. This part maintains identical package geometry and lead configuration as the 2SA2126-H, enabling direct mechanical substitution. Both parts are ROHS3 compliant and rated for 150°C maximum junction temperature. The 2SB1201T-E is active product status with established supply chain availability. Applications requiring maximum collector current of 2A or less are fully supported. Transition frequency of 150MHz accommodates moderate-speed switching applications.

For Surface-Mount PCB Designs:

The NJD1718T4G is the manufacturer-recommended substitute for designs utilizing surface-mount technology. This part requires PCB redesign to accommodate DPAK package footprint and is not a direct mechanical replacement. The NJD1718T4G provides superior power dissipation capability (1.68W) and is active product status. Applications requiring maximum collector current of 2A or less are supported. Transition frequency of 80MHz is suitable for lower-speed switching applications. This part is ROHS3 compliant.

Compliance Considerations:

Both substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original 2SA2126-H. Selection between through-hole and surface-mount options depends on PCB assembly technology and design constraints rather than electrical performance requirements.

Frequently Asked Questions (FAQ)

Q: Can the NJD1718T4G directly replace the 2SA2126-H without PCB modification?

A: No. The NJD1718T4G uses DPAK surface-mount package, while the 2SA2126-H uses through-hole TO-251-3 package. PCB footprint redesign is required. The 2SB1201T-E provides direct through-hole package compatibility.

Q: What is the impact of reduced collector current (2A) when substituting for the 3A rated 2SA2126-H?

A: Applications must operate within 2A maximum collector current limits. Circuits designed for 3A operation require redesign or alternative component selection. Verify application current requirements before substitution.

Q: Are both substitute parts ROHS3 compliant?

A: Yes. Both the NJD1718T4G and 2SB1201T-E are ROHS3 compliant, matching the compliance status of the 2SA2126-H.

Q: How does transition frequency affect substitution suitability?

A: The 2SA2126-H operates at 390MHz, the 2SB1201T-E at 150MHz, and the NJD1718T4G at 80MHz. Applications requiring high-frequency switching performance above 150MHz are not supported by either substitute. Verify circuit switching frequency requirements.

Q: Which substitute part has better availability?

A: The NJD1718T4G has higher inventory (2313 pcs) compared to the 2SB1201T-E (698 pcs). Both are active product status with established supply chains.

Q: Can the 2SB1201T-E be used as a direct pin-for-pin replacement?

A: Yes. The 2SB1201T-E uses identical TO-251-3 package and lead configuration as the 2SA2126-H, enabling direct mechanical and electrical substitution within the specified parameter limits.

Q: What is the difference between "MFR Recommended" and "Similar" substitute classifications?

A: The NJD1718T4G is manufacturer-recommended but requires PCB redesign due to different package type. The 2SB1201T-E is similar in that it maintains package compatibility but with reduced electrical performance specifications. Selection depends on design constraints and application requirements.