CLL4711 TR Zener Diode Equivalent & Substitute Parts

Part Overview

The CLL4711 TR is a 27 V, 500 mW Zener diode manufactured by Central Semiconductor Corp in SOD-80 (DO-213AC, MINI-MELF) surface mount packaging. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The obsolete status of the CLL4711 TR makes substitute part selection critical for maintaining circuit functionality while ensuring component availability and supply chain continuity.

Substiute Parts

CLL4711 TR

Central Semiconductor CorpIn Stock: 1024CLL4711 TR Datasheet

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CMHZ4711 TR

Central Semiconductor CorpIn Stock: 827CMHZ4711 TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CLL4711 TR are identified based on electrical parameter equivalence and mechanical compatibility within the Zener diode category. The primary substitution criteria are:

Electrical Parameters (Must Match):

• Voltage - Zener (Nominal): 27 V
• Tolerance: ±5%
• Power - Maximum: 500 mW
• Current - Reverse Leakage @ Vr: 10 nA @ 20.4 V
• Voltage - Forward (Max) @ If: 1.5 V @ 100 mA

Mechanical Parameters (Must Be Compatible):

• Mounting Type: Surface Mount
• Package / Case: SOD-80 or equivalent surface mount packages

The CMHZ4711 TR qualifies as a direct electrical equivalent with identical zener voltage, tolerance, power rating, and leakage characteristics. While the operating temperature range differs (CMHZ4711 TR: -65°C to 150°C versus CLL4711 TR: -65°C to 200°C), the electrical performance parameters remain equivalent. The CMHZ4711 TR is packaged in SOD-123, a standard surface mount package compatible with modern PCB assembly processes.

Parameter Comparison

Engineering Selection Recommendations

The CMHZ4711 TR is the primary substitute for the obsolete CLL4711 TR. Both components share identical electrical specifications for zener voltage (27 V), tolerance (±5%), power dissipation (500 mW), reverse leakage current (10 nA @ 20.4 V), and forward voltage characteristics (1.5 V @ 100 mA). The CMHZ4711 TR is currently in active production status, ensuring long-term availability and supply chain reliability.

The package transition from SOD-80 to SOD-123 represents a standard industry evolution in surface mount Zener diode packaging. Both packages are surface mount configurations suitable for automated PCB assembly. The SOD-123 package is widely supported by modern manufacturing processes and component libraries.

The operating temperature range of the CMHZ4711 TR (-65°C to 150°C) is narrower than the CLL4711 TR (-65°C to 200°C). Applications requiring operation above 150°C junction temperature require thermal analysis to confirm the CMHZ4711 TR is suitable for the intended operating environment.

Export compliance classifications (ECCN: EAR99) and tariff codes (HTSUS: 8541.10.0050) are identical between the main part and substitute, indicating no regulatory barriers to substitution.

Frequently Asked Questions (FAQ)

Q: Can the CMHZ4711 TR directly replace the CLL4711 TR in existing designs?

A: The CMHZ4711 TR provides electrical equivalence with identical zener voltage, tolerance, power rating, and leakage specifications. The primary design consideration is the package change from SOD-80 to SOD-123. PCB layout modifications are required to accommodate the different package footprint. Thermal performance should be evaluated if the application operates near the 150°C maximum junction temperature limit.

Q: What is the difference between SOD-80 and SOD-123 packages?

A: SOD-80 (DO-213AC, MINI-MELF) and SOD-123 are both surface mount Zener diode packages with different physical dimensions and land patterns. SOD-123 is a more compact package widely adopted in modern surface mount assembly. Component placement and routing on the PCB will differ between packages, requiring design layout updates.

Q: Are there any compliance or regulatory differences between CLL4711 TR and CMHZ4711 TR?

A: Both components share identical ECCN (EAR99) and HTSUS (8541.10.0050) classifications. No additional regulatory documentation or compliance modifications are required for substitution from a trade or export control perspective.

Q: What is the significance of the obsolete status of the CLL4711 TR?

A: Obsolete status indicates the CLL4711 TR is no longer manufactured and existing inventory is limited. The CMHZ4711 TR, with active production status, ensures continued availability for new production runs and design revisions. Substitution to an active part number is necessary for long-term supply chain sustainability.

Q: How should thermal performance be evaluated when substituting to CMHZ4711 TR?

A: The CMHZ4711 TR has a maximum junction temperature of 150°C compared to 200°C for the CLL4711 TR. Applications operating at high ambient temperatures or with high power dissipation should verify that the thermal design maintains junction temperature below 150°C. Thermal modeling or testing may be required for applications near this limit.

Q: Are the electrical characteristics identical between CLL4711 TR and CMHZ4711 TR?

A: Yes. Both components have identical zener voltage (27 V), tolerance (±5%), maximum power dissipation (500 mW), reverse leakage current (10 nA @ 20.4 V), and forward voltage characteristics (1.5 V @ 100 mA). Electrical circuit performance is equivalent.