CLL4684 TR Equivalent & Substitute Parts

Part Overview

The CLL4684 TR is a 3.3 V Zener diode rated at 500 mW with ±5% tolerance, manufactured by Central Semiconductor Corp in SOD-80 (Mini-MELF) surface mount package. This component is classified as obsolete, indicating discontinuation from the original manufacturer. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this Zener diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±5%	—
Power - Max	500	mW
Current - Reverse Leakage @ Vr	7.5 µA @ 1.5 V	—
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 100 mA	—
Operating Temperature	-65°C ~ 200°C	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	DO-213AC, MINI-MELF, SOD-80	—

Substitute Part Grouping Explanation

Substitution of the CLL4684 TR is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 3.3 V nominal
Power dissipation rating: 500 mW minimum
Voltage tolerance: ±5% or better
Package type: SOD-80 (Mini-MELF) surface mount
Forward voltage and reverse leakage characteristics within specified ranges
Operating temperature range compatibility

Substitution Logic:

Substitute parts are grouped into two categories based on package compatibility and electrical performance:

Direct Package Equivalents (SOD-80 Mini-MELF): Parts maintaining identical SOD-80 package form factor with matching or superior electrical specifications. These include TZMB3V3-GS08, TZMB3V3-GS18, TZMC3V3-GS08, and TZMC3V3-GS18 from Vishay General Semiconductor. These parts satisfy all primary substitution criteria and maintain mechanical compatibility with existing PCB layouts.
Alternative Package Option (SOD-123): The CMHZ4684 TR from Central Semiconductor Corp provides electrical equivalence but utilizes SOD-123 package, requiring PCB layout modification. This option is suitable only when package footprint redesign is feasible.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Package	Operating Temp	Product Status	Compliance
CLL4684 TR	Central Semiconductor Corp	3.3 V	±5%	500 mW	SOD-80	-65°C ~ 200°C	Obsolete	—
CMHZ4684 TR	Central Semiconductor Corp	3.3 V	±5%	500 mW	SOD-123	-65°C ~ 150°C	Active	REACH Unaffected
TZMB3V3-GS08	Vishay General Semiconductor	3.3 V	±2%	500 mW	SOD-80	-65°C ~ 175°C	Active	AEC-Q101, ROHS3, REACH Unaffected
TZMB3V3-GS18	Vishay General Semiconductor	3.3 V	±2%	500 mW	SOD-80	-65°C ~ 175°C	Active	AEC-Q101, ROHS3, REACH Unaffected
TZMC3V3-GS08	Vishay General Semiconductor	3.3 V	±5%	500 mW	SOD-80	-65°C ~ 175°C	Active	AEC-Q101, ROHS3, REACH Unaffected
TZMC3V3-GS18	Vishay General Semiconductor	3.3 V	±5%	500 mW	SOD-80	-65°C ~ 175°C	Active	AEC-Q101, ROHS3, REACH Unaffected

Engineering Selection Recommendations

For Direct Replacement (No PCB Modification Required):

The Vishay General Semiconductor TZM series Zener diodes—specifically TZMB3V3-GS08, TZMB3V3-GS18, TZMC3V3-GS08, and TZMC3V3-GS18—provide full electrical and mechanical compatibility with the CLL4684 TR. All four parts maintain SOD-80 package form factor, 3.3 V nominal Zener voltage, and 500 mW power rating. These parts carry active product status, ensuring long-term supply availability. The TZMB series offers ±2% tolerance (superior to the original ±5%), while the TZMC series matches the original ±5% tolerance specification.

All Vishay substitute parts carry AEC-Q101 automotive qualification and ROHS3 compliance, providing enhanced reliability documentation and regulatory alignment. The TZMB variants are recommended for applications requiring tighter voltage tolerance and automotive-grade qualification. The TZMC variants are recommended for applications where ±5% tolerance is acceptable and cost optimization is a consideration.

For Alternative Package Implementation:

The CMHZ4684 TR from Central Semiconductor Corp provides electrical equivalence with identical 3.3 V, ±5% tolerance, and 500 mW rating. However, this part utilizes SOD-123 package, requiring PCB footprint redesign. The operating temperature range is reduced to -65°C ~ 150°C compared to the original -65°C ~ 200°C specification. This option is suitable only when PCB layout modification is feasible and the reduced upper temperature limit is acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can TZMB3V3-GS08 and TZMB3V3-GS18 be used interchangeably with CLL4684 TR?

A: Yes. Both parts are electrically and mechanically equivalent to CLL4684 TR. The primary difference is packaging format: GS08 indicates Cut Tape & Digi-Reel packaging, while GS18 indicates Tape & Reel packaging. The electrical specifications and SOD-80 package form factor are identical. Selection between these variants depends on procurement and assembly requirements.

Q: What is the difference between TZMB3V3 and TZMC3V3 series?

A: Both series maintain identical 3.3 V nominal voltage, 500 mW power rating, and SOD-80 package. The primary difference is voltage tolerance: TZMB3V3 offers ±2% tolerance, while TZMC3V3 offers ±5% tolerance matching the original CLL4684 TR specification. TZMB3V3 is recommended for applications requiring tighter voltage regulation; TZMC3V3 is suitable when ±5% tolerance is acceptable.

Q: Is the CMHZ4684 TR a suitable replacement for CLL4684 TR?

A: CMHZ4684 TR provides electrical equivalence but uses SOD-123 package instead of SOD-80. This requires PCB footprint modification and is not a direct drop-in replacement. Additionally, the operating temperature range is limited to -65°C ~ 150°C versus the original -65°C ~ 200°C. This option is suitable only when PCB redesign is feasible and the reduced temperature range is acceptable.

Q: Do all substitute parts meet automotive qualification requirements?

A: The Vishay TZM series (TZMB3V3 and TZMC3V3 variants) carry AEC-Q101 automotive qualification. The Central Semiconductor CMHZ4684 TR does not specify automotive qualification. For automotive applications, Vishay TZM series parts are recommended.

Q: What is the significance of the GS08 and GS18 packaging designations?

A: GS08 indicates Cut Tape & Digi-Reel packaging format, suitable for automated assembly with standard tape feeders. GS18 indicates Tape & Reel packaging format, also suitable for automated assembly. Both formats are compatible with standard surface mount assembly equipment. Selection depends on procurement preferences and assembly line configuration.

Q: Are all substitute parts RoHS compliant?

A: All Vishay TZM series substitute parts (TZMB3V3-GS08, TZMB3V3-GS18, TZMC3V3-GS08, TZMC3V3-GS18) are ROHS3 compliant. The CMHZ4684 TR does not specify RoHS compliance status in the provided data. For applications requiring RoHS compliance documentation, Vishay parts are recommended.

Q: Can CLL4684 TR be used in new designs, or should substitute parts be specified?

A: CLL4684 TR is classified as obsolete and should not be specified for new designs. Active substitute parts from Vishay General Semiconductor (TZMB3V3 or TZMC3V3 series) should be specified for new designs to ensure long-term supply availability and manufacturing continuity.

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