CLL4679 BK Zener Diode Equivalent & Substitute Parts

Part Overview

The CLL4679 BK is a 2 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 part operates across a temperature range of -65°C to 200°C and maintains ±5% voltage tolerance with specified reverse leakage characteristics.

Substiute Parts

CLL4679 BK

Central Semiconductor CorpIn Stock: 895CLL4679 BK Datasheet

Current PartRFQ

CMHZ4679 BK

Central Semiconductor CorpIn Stock: 892CMHZ4679 BK Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CLL4679 BK is determined by electrical parameter equivalence and mechanical compatibility. The primary substitution criteria are:

Electrical Parameters (Must Match):

• Zener voltage: 2 V nominal
• Tolerance: ±5%
• Maximum power dissipation: 500 mW
• Reverse leakage current: 5 µA @ 1 V
• Forward voltage: 1.5 V @ 100 mA

Mechanical Parameters (Must Be Compatible):

• Mounting type: Surface mount
• Package classification: SOD series (SOD-80, SOD-123)

The CMHZ4679 BK qualifies as a direct electrical equivalent with identical zener voltage, tolerance, power rating, and leakage specifications. The primary difference is the package format (SOD-123 versus SOD-80) and operating temperature range, which affects board-level integration and thermal management considerations.

Parameter Comparison

Engineering Selection Recommendations

The CMHZ4679 BK is an active equivalent for the obsolete CLL4679 BK based on identical electrical specifications across all critical parameters: zener voltage, tolerance, power dissipation, reverse leakage, and forward voltage characteristics.

Product Status Consideration: The CLL4679 BK is obsolete with limited inventory availability (796 pcs). The CMHZ4679 BK maintains active production status with higher inventory levels (845 pcs), ensuring long-term supply chain continuity.

Temperature Range Differential: The CLL4679 BK operates to 200°C maximum junction temperature, while the CMHZ4679 BK operates to 150°C. Applications requiring operation above 150°C require thermal analysis to confirm the substitute part remains within safe operating limits.

Package Transition: The SOD-123 package of the CMHZ4679 BK differs from the SOD-80 package of the CLL4679 BK. PCB layout modifications are required to accommodate the different footprint dimensions. Both packages are surface mount configurations with equivalent electrical performance.

Compliance: Both parts carry identical ECCN (EAR99) and HTSUS (8541.10.0050) classifications, maintaining regulatory equivalence.

Frequently Asked Questions (FAQ)

Q: Can the CMHZ4679 BK directly replace the CLL4679 BK without circuit modification?

A: Electrical substitution is direct. The zener voltage, tolerance, power rating, and leakage specifications are identical. PCB layout modification is required due to package format differences (SOD-123 versus SOD-80). Thermal analysis is required for applications operating above 150°C junction temperature.

Q: What is the primary difference between these two parts?

A: The CLL4679 BK uses SOD-80 (MINI-MELF) packaging with a 200°C maximum operating temperature. The CMHZ4679 BK uses SOD-123 packaging with a 150°C maximum operating temperature. All electrical parameters are identical.

Q: Why is the CLL4679 BK listed as obsolete?

A: The CLL4679 BK is classified as obsolete by the manufacturer. The CMHZ4679 BK is the active production equivalent, ensuring availability for new designs and ongoing production.

Q: Are there any compliance or certification differences?

A: Both parts carry identical ECCN (EAR99) and HTSUS (8541.10.0050) classifications. No compliance differences exist between the two parts.

Q: What footprint changes are required when transitioning from CLL4679 BK to CMHZ4679 BK?

A: SOD-80 and SOD-123 packages have different physical dimensions and pad layouts. PCB footprint redesign is required. Consult the respective datasheets for precise dimensional specifications and pad configurations.

Q: Is the CMHZ4679 BK suitable for high-temperature applications above 150°C?

A: The CMHZ4679 BK is rated to 150°C maximum junction temperature. Applications requiring operation above 150°C require thermal analysis to confirm the part remains within safe operating limits or alternative components must be evaluated.