CLL4707 BK Zener Diode Equivalent & Substitute Parts

Part Overview

The CLL4707 BK is a 20 V, 500 mW Zener diode manufactured by Central Semiconductor Corp in SOD-80 (DO-213AC, MINI-MELF) surface mount package. 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 with ±5% voltage tolerance and 10 nA reverse leakage current at 15.2 V.

Substiute Parts

CLL4707 BK

Central Semiconductor CorpIn Stock: 1060CLL4707 BK Datasheet

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CMHZ4707 BK

Central Semiconductor CorpIn Stock: 1035CMHZ4707 BK Datasheet

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TLZ20-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 981TLZ20-GS08 Datasheet

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TLZ20A-GS08

Vishay General Semiconductor - Diodes DivisionIn Stock: 4785TLZ20A-GS08 Datasheet

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TLZ20A-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 1142TLZ20A-GS18 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the CLL4707 BK is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage: 20 V nominal
• Power dissipation: 500 mW maximum
• Mounting type: Surface mount
• Package compatibility: SOD-80 (DO-213AC, MINI-MELF) preferred for direct mechanical and electrical compatibility

Secondary Compatibility Factors:

• Reverse leakage current characteristics
• Forward voltage drop specifications
• Operating temperature range
• Voltage tolerance

Substitute parts are grouped into two categories:

Category 1: Direct Package Equivalents (SOD-80) Parts maintaining identical SOD-80 package form factor with matching electrical specifications. These provide direct board-level compatibility without layout modifications.

Category 2: Alternative Package Equivalents (SOD-123) Parts with identical electrical specifications but different surface mount package (SOD-123). These require PCB layout adjustment but maintain full functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No PCB Modification Required):

The TLZ20-GS08, TLZ20A-GS08, and TLZ20A-GS18 are recommended as primary substitutes. All three parts maintain the SOD-80 package form factor identical to the CLL4707 BK, enabling direct board-level substitution without layout changes. These Vishay parts are active products with ROHS3 compliance and REACH unaffected status, supporting current manufacturing and regulatory requirements.

Between the three Vishay options, TLZ20A-GS08 and TLZ20A-GS18 are functionally equivalent, with the primary difference being packaging format (Tape & Reel designation). Both provide 4750 Pcs and 1098 Pcs inventory availability respectively. TLZ20-GS08 offers 923 Pcs availability with identical electrical performance.

For Alternative Package Implementation (PCB Modification Required):

The CMHZ4707 BK from Central Semiconductor Corp provides electrical equivalence with identical 20 V, 500 mW specifications and ±5% tolerance matching the original part. However, this substitute uses SOD-123 package, requiring PCB footprint redesign. The CMHZ4707 BK is an active product with 1013 Pcs inventory availability and REACH unaffected status. This option is suitable only when PCB layout modification is feasible.

Temperature Range Consideration:

The CLL4707 BK operates to 200°C maximum junction temperature. Substitute parts operate to 150°C (CMHZ4707 BK) or 175°C (Vishay TLZ series). Applications requiring operation above 175°C cannot use these substitutes and require alternative component selection.

Frequently Asked Questions (FAQ)

Q: Can TLZ20A-GS08 directly replace CLL4707 BK without PCB modification?

A: Yes. Both parts use identical SOD-80 (DO-213AC, MINI-MELF) package form factor. Electrical specifications are compatible: 20 V zener voltage, 500 mW power rating, and surface mount configuration. No PCB layout changes are required.

Q: What is the difference between TLZ20-GS08, TLZ20A-GS08, and TLZ20A-GS18?

A: All three are Vishay 20 V, 500 mW zener diodes in SOD-80 package. TLZ20-GS08 and TLZ20A-GS08 differ in reverse leakage current specifications (not specified for TLZ20-GS08 versus 40 nA @ 17.1 V for TLZ20A-GS08). TLZ20A-GS18 is electrically identical to TLZ20A-GS08 but supplied in different tape reel configuration (18-unit reel versus 8-unit reel). All three are functionally equivalent for circuit applications.

Q: Why is CMHZ4707 BK listed as a substitute if it uses a different package?

A: CMHZ4707 BK provides electrical equivalence with identical zener voltage, power rating, and tolerance specifications. The SOD-123 package is smaller than SOD-80 but requires PCB footprint redesign. This substitute is applicable only when PCB layout modification is acceptable.

Q: Are the Vishay TLZ20 series parts RoHS and REACH compliant?

A: Yes. All Vishay TLZ20-GS08, TLZ20A-GS08, and TLZ20A-GS18 parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for manufacturing and distribution.

Q: What is the maximum operating temperature for substitute parts?

A: Vishay TLZ series parts operate to 175°C junction temperature. CMHZ4707 BK operates to 150°C. The original CLL4707 BK operates to 200°C. Applications requiring operation above 175°C cannot use these substitutes.

Q: Can I use CMHZ4707 BK in a design originally specified for CLL4707 BK?

A: Electrical substitution is valid. However, the SOD-123 package requires PCB footprint modification. The reduced maximum operating temperature (150°C versus 200°C) must be verified against application requirements. PCB layout redesign is mandatory.

Q: Which substitute part has the highest inventory availability?

A: TLZ20A-GS08 has 4750 Pcs in stock, providing the highest availability among all substitute options.