CLL4707 TR Zener Diode Equivalent & Substitute Parts

Part Overview

The CLL4707 TR 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 product status. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements where the original part is no longer readily available through standard distribution channels.

Substiute Parts

CLL4707 TR

Central Semiconductor CorpIn Stock: 876CLL4707 TR Datasheet

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CMHZ4707 TR

Central Semiconductor CorpIn Stock: 875CMHZ4707 TR 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 TR is determined by the following critical parameters:

Primary Substitution Criteria:

• Voltage - Zener (Nom): 20 V (exact match required)
• Power - Max: 500 mW (exact match required)
• Mounting Type: Surface Mount (required)
• Package / Case: SOD-80 or compatible surface mount package

Secondary Compatibility Factors:

• Operating Temperature Range: Minimum -65°C to at least 150°C
• Voltage - Forward (Vf): 1.5 V @ 100 mA or lower
• Current - Reverse Leakage: 10 nA @ 15.2 V or lower

Substitute parts must maintain electrical equivalence across all primary criteria. Package compatibility is essential for PCB layout and assembly process alignment. Operating temperature range may vary within acceptable limits for most applications, provided the minimum and maximum operating conditions of the substitute part encompass the intended use environment.

Parameter Comparison

Engineering Selection Recommendations

Direct Package-Compatible Substitutes (SOD-80):

TLZ20A-GS08 and TLZ20A-GS18 are functionally equivalent to CLL4707 TR with identical zener voltage (20 V) and power rating (500 mW) in the same SOD-80 package. Both parts are manufactured by Vishay General Semiconductor and carry active product status. These parts are ROHS3 compliant and REACH unaffected, providing regulatory compliance advantages over the obsolete CLL4707 TR. Operating temperature range extends to 175°C, which is lower than the original part's 200°C maximum but sufficient for most industrial and commercial applications. Inventory availability is significantly higher for both Vishay alternatives (4750 Pcs and 1098 Pcs respectively versus 835 Pcs for the original).

Alternative Package Substitute (SOD-123):

CMHZ4707 TR is manufactured by Central Semiconductor Corp and maintains identical electrical specifications (20 V, 500 mW, ±5% tolerance) to the CLL4707 TR. This part differs in package format, using SOD-123 instead of SOD-80. CMHZ4707 TR carries active product status and is suitable for applications where PCB layout can accommodate the SOD-123 package footprint. Operating temperature maximum is reduced to 150°C. This option provides continuity with the original manufacturer while addressing obsolescence.

Selection Basis:

For applications requiring SOD-80 package retention, TLZ20A-GS08 or TLZ20A-GS18 are preferred due to active status, regulatory compliance, and superior inventory availability. For applications permitting package change to SOD-123, CMHZ4707 TR maintains manufacturer continuity. Operating temperature requirements below 150°C favor CMHZ4707 TR; requirements between 150°C and 175°C favor Vishay alternatives; requirements above 175°C require design review.

Frequently Asked Questions (FAQ)

Q: Can TLZ20A-GS08 and TLZ20A-GS18 be used interchangeably with CLL4707 TR?

A: Yes, both Vishay parts are electrically equivalent to CLL4707 TR with matching 20 V zener voltage and 500 mW power rating in the same SOD-80 package. The primary difference is operating temperature range (175°C maximum versus 200°C for the original). Verify that your application does not require operation above 175°C junction temperature.

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

A: Both parts are identical in electrical specifications and package. The designation suffix (-GS08 versus -GS18) indicates different tape and reel configurations for automated assembly. Selection between these variants depends on your production equipment and tape specifications. Electrical performance is equivalent.

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

A: CMHZ4707 TR is included as a substitute option for designs where PCB layout modifications are acceptable. It maintains the original manufacturer (Central Semiconductor Corp) and identical electrical specifications (20 V, 500 mW, ±5% tolerance). Package change from SOD-80 to SOD-123 requires PCB redesign but may be necessary if SOD-80 alternatives are unavailable.

Q: Are the Vishay TLZ20A parts RoHS compliant?

A: Yes, both TLZ20A-GS08 and TLZ20A-GS18 are ROHS3 compliant and REACH unaffected. The original CLL4707 TR compliance status is not specified. Vishay alternatives provide documented regulatory compliance for applications requiring RoHS certification.

Q: What is the impact of higher reverse leakage current in the Vishay parts?

A: Vishay TLZ20A parts specify 40 nA @ 17.1 V reverse leakage versus 10 nA @ 15.2 V for CLL4707 TR. This difference is measured at different voltage points and represents acceptable variation within zener diode specifications. For most voltage regulation and protection applications, this leakage difference is negligible. Verify leakage requirements for precision analog circuits or high-impedance applications.

Q: Can I use these substitutes in new designs or only for replacement of existing CLL4707 TR components?

A: These substitutes are suitable for both new designs and field replacements. TLZ20A-GS08 and TLZ20A-GS18 are preferred for new designs due to active product status, regulatory compliance, and superior availability. The original CLL4707 TR should not be specified for new designs due to obsolete status.

Q: What is the moisture sensitivity level of these parts?

A: TLZ20A-GS08 and TLZ20A-GS18 specify MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage procedures are sufficient. Moisture sensitivity data for CLL4707 TR and CMHZ4707 TR is not provided in available specifications.