2DD2678-13 Equivalent & Substitute Parts

Part Overview

The 2DD2678-13 is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This device features a 12 V collector-emitter breakdown voltage, 3 A maximum collector current, and 900 mW power dissipation capability in a surface mount SOT-89-3 package. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility within the specified electrical and mechanical parameters.

Substiute Parts

2DD2678-13

Diodes IncorporatedIn Stock: 302602DD2678-13 Datasheet

Current PartRFQ

FCX688BTA

Diodes IncorporatedIn Stock: 15754FCX688BTA Datasheet

MFR RecommendedRFQ

PBSS301NX,115

NXP USA Inc.In Stock: 428530PBSS301NX,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2DD2678-13 is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

• Transistor type: NPN configuration
• Collector-emitter breakdown voltage: 12 V maximum
• Package type: SOT-89-3 surface mount
• Mounting technology: Surface mount
• Compliance: RoHS3 compliant

Allowable Parameter Variations: Substitute parts may exceed the original specifications in the following areas without compromising circuit compatibility:

• Maximum collector current (Ic): Original 3 A; substitutes may provide higher ratings
• Maximum power dissipation: Original 900 mW; substitutes may provide higher ratings
• Transition frequency: Original 170 MHz; substitutes may provide lower ratings
• DC current gain (hFE): Variations acceptable within active region operation

The identified substitute parts FCX688BTA and PBSS301NX,115 satisfy all mandatory equivalence criteria and maintain backward compatibility with applications designed for the 2DD2678-13.

Parameter Comparison

Engineering Selection Recommendations

FCX688BTA (Diodes Incorporated)

The FCX688BTA is an active product offering direct functional equivalence to the 2DD2678-13. Both devices are manufactured by Diodes Incorporated and share identical electrical ratings for collector current (3 A) and collector-emitter breakdown voltage (12 V). The FCX688BTA provides enhanced power dissipation capability (2 W versus 900 mW) and maintains the same operating temperature range (-55°C to 150°C). This part is suitable for direct replacement in existing designs without circuit modification. RoHS3 compliance and REACH unaffected status align with the original part specifications.

PBSS301NX,115 (NXP USA Inc.)

The PBSS301NX,115 is an active product from NXP USA Inc. (Nexperia brand) that exceeds the original 2DD2678-13 specifications in collector current (5.3 A versus 3 A) and power dissipation (2.1 W versus 900 mW). The device maintains the 12 V collector-emitter breakdown voltage and surface mount SOT-89 package configuration. The transition frequency is lower (140 MHz versus 170 MHz), which does not restrict compatibility in applications operating below this frequency threshold. RoHS3 compliance and REACH unaffected status are maintained. This part is suitable for applications requiring higher current capacity or thermal margin.

Both substitute parts satisfy mandatory equivalence criteria and are available in active production status, ensuring long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can the FCX688BTA directly replace the 2DD2678-13 without circuit modifications?

A: Yes. The FCX688BTA maintains identical electrical specifications for collector current (3 A) and collector-emitter breakdown voltage (12 V), operates across the same temperature range (-55°C to 150°C), and uses the same SOT-89-3 surface mount package. No circuit modifications are required.

Q: What is the primary advantage of the PBSS301NX,115 over the 2DD2678-13?

A: The PBSS301NX,115 provides higher maximum collector current (5.3 A versus 3 A) and greater power dissipation capability (2.1 W versus 900 mW). These enhancements allow operation in applications with higher current demands or improved thermal performance. The 12 V collector-emitter breakdown voltage remains equivalent.

Q: Are there any frequency limitations when substituting with the PBSS301NX,115?

A: The PBSS301NX,115 has a transition frequency of 140 MHz, compared to 170 MHz for the 2DD2678-13. This lower frequency rating does not restrict compatibility in applications operating below 140 MHz. Applications requiring operation above 140 MHz should use the FCX688BTA (150 MHz) or retain the original 2DD2678-13 specification.

Q: Do the substitute parts maintain RoHS3 compliance?

A: Yes. Both FCX688BTA and PBSS301NX,115 are RoHS3 compliant and REACH unaffected, matching the compliance status of the original 2DD2678-13.

Q: What is the difference between SOT-89-3 and SOT-89 packaging?

A: Both designations refer to the same three-lead surface mount package (TO-243AA). The nomenclature variation reflects different manufacturer documentation standards. Physical dimensions and pin configurations are equivalent, ensuring mechanical compatibility in PCB layouts designed for the 2DD2678-13.

Q: Can the FCX688BTA and PBSS301NX,115 be used interchangeably in the same application?

A: Both parts are functionally compatible with the 2DD2678-13 and share the same package type. However, they differ in maximum collector current (3 A versus 5.3 A) and transition frequency (150 MHz versus 140 MHz). Selection between these substitutes depends on specific application requirements for current capacity and frequency response. Either part is suitable for applications within the original 2DD2678-13 specifications.

Q: Is the 2DD2678-13 still available for new designs?

A: The 2DD2678-13 is classified as obsolete. New designs should specify either FCX688BTA or PBSS301NX,115 to ensure long-term supply availability and manufacturing continuity.