CLL4709 BK TIN/LEAD Equivalent & Substitute Parts

Part Overview

The CLL4709 BK TIN/LEAD is a surface mount Zener diode rated at 24 V nominal with 500 mW power dissipation and ±5% tolerance. Manufactured by Central Semiconductor Corp, this component is packaged in DO-213AC (MINI-MELF, SOD-80) format. The part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support, maintenance, and production continuity. Substitute parts must maintain electrical performance across voltage regulation, power handling, and thermal operating ranges while accommodating alternative package formats.

Substiute Parts

CLL4709 BK TIN/LEAD

Central Semiconductor CorpIn Stock: 3494CLL4709 BK TIN/LEAD Datasheet

Current PartRFQ

CMHZ4709 BK TIN/LEAD

Central Semiconductor CorpIn Stock: 824CMHZ4709 BK TIN/LEAD Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CLL4709 BK TIN/LEAD are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters (Must Match):

• Voltage - Zener (Nom): 24 V
• Tolerance: ±5%
• Power - Max: 500 mW
• Current - Reverse Leakage @ Vr: 10 nA @ 18.2 V
• Voltage - Forward (Vf) (Max) @ If: 1.5 V @ 100 mA

Mechanical Parameters (Must Be Compatible):

• Mounting Type: Surface Mount
• Package / Case: Alternative surface mount packages acceptable if footprint compatibility is verified

Operational Parameters (Must Support):

• Operating Temperature Range: Must support minimum -65°C to 150°C; extended range to 200°C is not required for substitution

The CMHZ4709 BK TIN/LEAD meets all electrical parameter requirements and operates as a direct functional equivalent. The primary difference is the package format (SOD-123 versus SOD-80) and the reduced upper operating temperature limit (150°C versus 200°C).

Parameter Comparison

Engineering Selection Recommendations

The CMHZ4709 BK TIN/LEAD is a functional equivalent to the obsolete CLL4709 BK TIN/LEAD for applications requiring a 24 V, 500 mW Zener diode with ±5% tolerance. Both components are manufactured by Central Semiconductor Corp and share identical electrical specifications.

Selection Basis:

The CMHZ4709 BK TIN/LEAD is classified as Active product status, ensuring ongoing availability and manufacturing support. The CLL4709 BK TIN/LEAD is obsolete, making the CMHZ4709 the appropriate choice for new designs and production continuity.

Package Consideration:

The CMHZ4709 uses SOD-123 packaging instead of the original SOD-80 (DO-213AC, MINI-MELF). PCB layout modifications are required to accommodate the different footprint. SOD-123 is a standard surface mount package with established design guidelines and manufacturing processes.

Operating Temperature:

The CMHZ4709 operates across -65°C to 150°C, which covers the standard industrial temperature range. Applications requiring operation above 150°C must evaluate thermal management or alternative component selection. The original CLL4709 extended to 200°C; this difference must be assessed against specific application requirements.

Compliance:

The CMHZ4709 is REACH Unaffected, indicating compliance with current regulatory requirements. The original CLL4709 is RoHS non-compliant. For applications subject to RoHS or REACH regulations, the CMHZ4709 is the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Can the CMHZ4709 BK TIN/LEAD directly replace the CLL4709 BK TIN/LEAD without circuit modification?

A: Electrical substitution is direct; both components have identical Zener voltage (24 V), tolerance (±5%), power rating (500 mW), and forward voltage characteristics. However, PCB layout modification is required due to package format differences (SOD-123 versus SOD-80). The different footprints are not interchangeable without redesign.

Q: What is the impact of the reduced operating temperature range on the CMHZ4709?

A: The CMHZ4709 operates from -65°C to 150°C, compared to the CLL4709 range of -65°C to 200°C. For applications operating below 150°C junction temperature, this difference has no impact. Applications requiring sustained operation above 150°C must evaluate thermal design or select alternative components.

Q: Are there any compliance differences between the two parts?

A: The CMHZ4709 is REACH Unaffected and carries Active product status. The CLL4709 is RoHS non-compliant and obsolete. For new designs and applications subject to environmental regulations, the CMHZ4709 is the compliant choice.

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

A: SOD-80 (MINI-MELF) and SOD-123 are both surface mount diode packages with different physical dimensions and footprints. SOD-123 is smaller and more compact. PCB design files, assembly specifications, and pick-and-place programming must be updated to accommodate the SOD-123 package.

Q: Is the CMHZ4709 available in the same tin/lead finish as the original?

A: Yes, the CMHZ4709 BK TIN/LEAD designation indicates the same tin/lead finish as the original CLL4709 BK TIN/LEAD.

Q: What inventory status should be considered for production planning?

A: The CLL4709 BK TIN/LEAD has 3,475 pieces in stock but is obsolete with no future manufacturing. The CMHZ4709 BK TIN/LEAD has 762 pieces in stock and is Active product status, ensuring continued availability for future orders.