CLL5221B BK Equivalent & Substitute Parts

Part Overview

The CLL5221B BK is a Zener diode rated at 2.4 V nominal with 500 mW power dissipation, manufactured by Central Semiconductor Corp in the SOD-80 (DO-213AC, MINI-MELF) surface mount package. This component is classified as obsolete, indicating discontinued production and limited availability for new designs. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this Zener diode specification.

Substiute Parts

CLL5221B BK

Central Semiconductor CorpIn Stock: 734CLL5221B BK Datasheet

Current PartRFQ

CMHZ5221B BK

Central Semiconductor CorpIn Stock: 916CMHZ5221B BK Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CLL5221B BK is determined by strict electrical and mechanical parameter matching within the Zener diode category. The primary substitution criteria are:

Electrical Parameters (Must Match):

• Zener voltage: 2.4 V nominal
• Tolerance: ±5%
• Power rating: 500 mW minimum
• Impedance (Max): 30 Ohms maximum
• Reverse leakage current: 100 µA @ 1 V maximum

Mechanical Parameters (Must Match):

• Mounting type: Surface Mount
• Package compatibility: SOD-80 or equivalent surface mount packages

The CMHZ5221B BK from Central Semiconductor Corp satisfies all electrical parameters and operates as a direct functional equivalent. While packaged in SOD-123 rather than SOD-80, both packages are surface mount configurations with compatible footprint characteristics for most applications. The substitute part maintains identical Zener voltage, tolerance, power rating, impedance, and reverse leakage specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: CMHZ5221B BK

The CMHZ5221B BK is the recommended substitute for the obsolete CLL5221B BK. This part maintains identical electrical specifications across all critical parameters: Zener voltage, tolerance, power rating, impedance, and reverse leakage current. Both components are manufactured by Central Semiconductor Corp, ensuring consistent quality and performance characteristics.

The CMHZ5221B BK holds Active product status, providing assured long-term availability and supply chain stability compared to the obsolete CLL5221B BK. This substitution eliminates obsolescence risk while preserving circuit functionality.

Package Consideration:

The substitute part is packaged in SOD-123, a standard surface mount package, compared to the SOD-80 (MINI-MELF) package of the original part. Both are surface mount configurations suitable for automated assembly. PCB layout modifications may be required to accommodate the different package footprint. SOD-123 is a widely supported package in modern PCB design tools and manufacturing processes.

Compliance:

The CMHZ5221B BK carries REACH Unaffected status and maintains the same ECCN (EAR99) and HTSUS (8541.10.0050) classifications as the original part, ensuring regulatory compliance across supply chain and export requirements.

Frequently Asked Questions (FAQ)

Q: Can the CMHZ5221B BK directly replace the CLL5221B BK in existing designs?

A: The CMHZ5221B BK provides electrical equivalence with identical Zener voltage, tolerance, power rating, impedance, and reverse leakage specifications. PCB layout modifications are required due to the package change from SOD-80 to SOD-123. Electrical functionality remains unchanged.

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 packages for discrete diodes. SOD-123 is a smaller, more compact package widely used in modern surface mount applications. Both packages are compatible with standard PCB assembly processes, but footprint dimensions differ and require separate PCB design layouts.

Q: Why is the CLL5221B BK classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production of this part. The CMHZ5221B BK, with identical electrical specifications and Active product status, ensures continued availability and eliminates supply chain discontinuity.

Q: Are there any temperature rating differences between the main part and substitute?

A: The CLL5221B BK operates across -65°C to 200°C (TJ), while the CMHZ5221B BK operates to 150°C (TJ) maximum. For applications requiring operation above 150°C, the substitute part may not be suitable. For standard operating ranges below 150°C, the substitute provides full compatibility.

Q: What compliance certifications apply to the CMHZ5221B BK?

A: The CMHZ5221B BK carries REACH Unaffected status, ECCN classification EAR99, and HTSUS code 8541.10.0050, matching the regulatory framework of the original part.

Q: Are there alternative Zener diodes from other manufacturers with the same specifications?

A: The substitute list includes cross-reference part numbers from other manufacturers: BZT52C2V4-7-F, DDZ9681-7, BZT52C2V4T-7, BZT52C2V4S-7-F, and MMSZ5221BS-7-F. These parts maintain the 2.4 V Zener voltage and 500 mW power rating specifications. Package and performance characteristics vary by manufacturer and should be evaluated against specific application requirements.