BZX55C27 Equivalent & Substitute Parts

Part Overview

The BZX55C27 is a Zener diode manufactured by onsemi, rated for 27 V nominal Zener voltage with 500 mW maximum power dissipation. This component is packaged in a DO-35 through-hole axial configuration and operates across a temperature range of -65°C to 200°C. The part is classified as obsolete, necessitating identification of active equivalent components for ongoing design requirements and procurement needs.

Substiute Parts

BZX55C27

onsemiIn Stock: 4034BZX55C27 Datasheet

Current PartRFQ

1N5076

Microchip TechnologyIn Stock: 10001N5076 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BZX55C27 is determined by the following critical electrical and mechanical parameters:

Primary Matching Criteria:

• Zener voltage rating: 27 V nominal
• Mounting type: Through hole
• Package configuration: Axial

Secondary Compatibility Factors:

• Power dissipation capability
• Voltage tolerance
• Impedance characteristics
• Reverse leakage current specifications
• Operating temperature range

The 1N5076 qualifies as a substitute based on matching the primary criteria of 27 V Zener voltage, through-hole mounting, and axial package configuration. However, this substitute exhibits different electrical characteristics in power rating, tolerance, impedance, and leakage current, which must be evaluated against specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

The 1N5076 is an active substitute for the obsolete BZX55C27, sharing identical 27 V Zener voltage rating and through-hole axial mounting configuration. Both components maintain REACH Unaffected status and EAR99 ECCN classification.

Electrical Differences: The 1N5076 provides superior power dissipation capability at 3 W compared to the BZX55C27 at 500 mW, enabling operation in higher-power applications. The 1N5076 exhibits tighter voltage tolerance (±5% versus ±7%) and lower impedance (12 Ohms versus 80 Ohms), resulting in improved voltage regulation characteristics. Reverse leakage current is higher in the 1N5076 at 1 µA compared to 100 nA in the BZX55C27.

Temperature Range Consideration: The BZX55C27 operates to 200°C maximum, while the 1N5076 operates to 175°C maximum. Applications requiring operation above 175°C require verification of thermal requirements against the 1N5076 specification.

Procurement Status: The 1N5076 is currently in active production with available inventory, whereas the BZX55C27 is obsolete. Selection of the 1N5076 ensures long-term component availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the 1N5076 directly replace the BZX55C27 in all applications?

A: The 1N5076 shares the same 27 V Zener voltage rating and through-hole axial package, making it mechanically and electrically compatible for most applications. However, circuit-specific requirements must be evaluated, particularly regarding power dissipation limits, voltage tolerance, impedance characteristics, and maximum operating temperature.

Q: What are the key electrical differences between these parts?

A: The 1N5076 provides 3 W power dissipation versus 500 mW in the BZX55C27, tighter voltage tolerance (±5% versus ±7%), lower impedance (12 Ohms versus 80 Ohms), and higher reverse leakage current (1 µA versus 100 nA). These differences affect voltage regulation performance and power handling capability.

Q: Does the 1N5076 fit the same PCB footprint as the BZX55C27?

A: Both components use through-hole axial mounting. Physical dimensions should be verified against specific PCB design requirements, as DO-35 and axial packages may have different lead spacing and body dimensions.

Q: What is the impact of the lower maximum operating temperature of the 1N5076?

A: The 1N5076 operates to 175°C maximum, compared to 200°C for the BZX55C27. Applications requiring sustained operation above 175°C must confirm thermal compatibility with the 1N5076 specifications.

Q: Is the 1N5076 suitable for low-leakage applications?

A: The 1N5076 exhibits reverse leakage current of 1 µA at 20.6 V, compared to 100 nA at 20 V for the BZX55C27. Applications with strict leakage current requirements must evaluate whether the higher leakage of the 1N5076 is acceptable for the intended circuit function.

Q: Are both parts compliant with current regulatory requirements?

A: Both the BZX55C27 and 1N5076 maintain REACH Unaffected status and EAR99 ECCN classification, confirming compliance with current export and environmental regulations.