2N5679 Equivalent & Substitute Parts

Part Overview

The 2N5679 is a PNP bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 1 A maximum collector current in a TO-39 metal can package. This component is classified as obsolete, which necessitates identification of functionally equivalent substitute parts for new designs and ongoing production requirements. The 2N5679 is non-RoHS compliant and represents legacy semiconductor technology still in use for maintenance and repair applications.

Substiute Parts

2N5679

onsemiIn Stock: 9142N5679 Datasheet

Current PartRFQ

ZTX553

Diodes IncorporatedIn Stock: 99204ZTX553 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2N5679 is determined by strict equivalence across the following electrical and mechanical parameters:

• Transistor Type: Must be PNP configuration
• Maximum Collector Current (Ic): Must be rated for 1 A or greater
• Collector-Emitter Breakdown Voltage: Must be rated for 100 V or greater
• Maximum Power Dissipation: Must be rated for 1 W or greater
• DC Current Gain (hFE): Minimum value must be 40 or greater at specified operating conditions
• Mounting Configuration: Through-hole technology required for mechanical compatibility

The ZTX553 manufactured by Diodes Incorporated meets all electrical parameter requirements for direct substitution. Both devices share identical ratings for collector current, breakdown voltage, power dissipation, and minimum current gain. The ZTX553 operates across an extended temperature range (-55°C to 200°C) and includes transition frequency specification (150 MHz), providing enhanced performance characteristics while maintaining backward compatibility with 2N5679 circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The ZTX553 is a direct electrical equivalent to the 2N5679 and is suitable for substitution in applications requiring PNP transistor functionality at 100 V, 1 A ratings. The ZTX553 is manufactured by Diodes Incorporated and maintains active product status with full ROHS3 compliance, providing long-term availability and regulatory alignment for new designs.

Key considerations for selection:

• Product Status: The 2N5679 is obsolete; the ZTX553 is active and recommended for new applications
• Regulatory Compliance: The ZTX553 is ROHS3 compliant, whereas the 2N5679 is non-compliant
• Package Compatibility: The 2N5679 uses TO-39 metal can packaging; the ZTX553 uses E-Line (TO-92 compatible) packaging. Physical board layout modifications may be required
• Electrical Performance: The ZTX553 demonstrates superior saturation voltage characteristics (250 mV versus 1 V) and lower collector cutoff current (100 nA versus 10 µA), indicating improved switching performance
• Temperature Range: The ZTX553 specifies operating temperature range (-55°C to 200°C); the 2N5679 does not provide this specification

Frequently Asked Questions (FAQ)

Q: Can the ZTX553 directly replace the 2N5679 in existing circuit boards?

A: The ZTX553 is electrically equivalent and functionally compatible. However, the package difference (TO-39 versus E-Line/TO-92) requires physical layout verification. The three-lead configuration is identical, but lead spacing and mounting hole dimensions differ between packages. Mechanical adaptation or board redesign may be necessary.

Q: What are the primary electrical differences between these devices?

A: Both devices meet the core electrical specifications (1 A, 100 V, 1 W, hFE ≥ 40). The ZTX553 exhibits lower saturation voltage (250 mV versus 1 V) and lower collector cutoff current (100 nA versus 10 µA), resulting in improved switching characteristics and reduced leakage current.

Q: Is the ZTX553 suitable for new product designs?

A: Yes. The ZTX553 is active product status with ROHS3 compliance, making it appropriate for new designs. The 2N5679 is obsolete and should not be specified for new applications.

Q: Are there any temperature operating range considerations?

A: The ZTX553 specifies operating temperature range of -55°C to 200°C. The 2N5679 does not provide operating temperature specification in the available data. Applications requiring defined temperature performance should reference the ZTX553 datasheet.

Q: What is the impact of the package change from TO-39 to E-Line?

A: The TO-39 is a metal can package; the E-Line is a plastic package compatible with TO-92 footprints. This change affects thermal characteristics, mechanical mounting, and board layout. The E-Line package typically provides lower thermal mass and different lead configuration. Circuit board modifications are required for physical compatibility.

Q: Can the 2N5679 still be sourced?

A: The 2N5679 is classified as obsolete. While inventory may exist from legacy stock (869 pieces noted as available), long-term availability is not assured. The ZTX553 is the recommended alternative for ongoing production and new applications.