CLL4679 TR Equivalent & Substitute Parts

Part Overview

The CLL4679 TR is a Zener diode manufactured by Central Semiconductor Corp, rated at 2 V nominal voltage with 500 mW maximum power dissipation. The device is packaged in SOD-80 (DO-213AC, MINI-MELF) surface mount configuration and operates across a temperature range of -65°C to 200°C. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support, maintenance, and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	2	V
Tolerance	±5	%
Power - Max	500	mW
Current - Reverse Leakage @ Vr	5	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 100 mA
Operating Temperature Range	-65 to 200	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	SOD-80	—

Substitute Part Grouping Explanation

Substitution of the CLL4679 TR is determined by electrical parameter equivalence and mechanical compatibility. The critical parameters governing substitution are:

Zener Voltage (Vz): 2 V nominal with ±5% tolerance
Power Dissipation: 500 mW maximum
Reverse Leakage Current: 5 µA @ 1 V
Forward Voltage: 1.5 V maximum @ 100 mA
Mounting Type: Surface mount configuration
Temperature Operating Range: Minimum -65°C to 150°C (or higher)

The CMHZ4679 TR meets all electrical specifications of the CLL4679 TR. The primary difference is the package format: SOD-123 replaces SOD-80. This substitution is valid where PCB layout and mechanical constraints permit SOD-123 package accommodation. The CMHZ4679 TR operates at a reduced maximum junction temperature (-65°C to 150°C versus -65°C to 200°C), which must be evaluated against application thermal requirements.

Parameter Comparison

Parameter	CLL4679 TR	CMHZ4679 TR	Match
Manufacturer	Central Semiconductor Corp	Central Semiconductor Corp	Yes
Category	Diodes, Zener	Diodes, Zener	Yes
Voltage - Zener (Nom)	2 V	2 V	Yes
Tolerance	±5%	±5%	Yes
Power - Max	500 mW	500 mW	Yes
Current - Reverse Leakage @ Vr	5 µA @ 1 V	5 µA @ 1 V	Yes
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 100 mA	1.5 V @ 100 mA	Yes
Operating Temperature Range	-65°C ~ 200°C	-65°C ~ 150°C	Partial
Mounting Type	Surface Mount	Surface Mount	Yes
Package / Case	SOD-80 (DO-213AC, MINI-MELF)	SOD-123	Different
Product Status	Obsolete	Active	—

Engineering Selection Recommendations

The CMHZ4679 TR is an active product substitute for the obsolete CLL4679 TR, offering identical electrical performance across all specified parameters. Selection of the CMHZ4679 TR is appropriate for applications where:

PCB layout and assembly processes accommodate SOD-123 package geometry
Operating junction temperature does not exceed 150°C
Component availability and supply chain continuity are priorities

The reduced maximum operating temperature of the CMHZ4679 TR (-65°C to 150°C versus -65°C to 200°C) must be evaluated against application thermal profiles. If sustained junction temperatures above 150°C are required, the CLL4679 TR specification cannot be fully replicated with the CMHZ4679 TR.

Both parts carry identical ECCN (EAR99) and HTSUS (8541.10.0050) classifications, indicating equivalent export control and tariff treatment.

Frequently Asked Questions (FAQ)

Q: Can the CMHZ4679 TR directly replace the CLL4679 TR in existing designs?

A: Electrical substitution is valid. Mechanical substitution requires PCB redesign to accommodate SOD-123 package dimensions in place of SOD-80. Thermal analysis must confirm that application operating temperatures remain within the CMHZ4679 TR maximum of 150°C junction temperature.

Q: What is the primary difference between these two parts?

A: The CLL4679 TR uses SOD-80 (MINI-MELF) packaging, while the CMHZ4679 TR uses SOD-123 packaging. The CMHZ4679 TR also has a lower maximum operating temperature (150°C versus 200°C).

Q: Are the electrical specifications identical?

A: Yes. Both parts share identical Zener voltage (2 V), tolerance (±5%), power rating (500 mW), reverse leakage current (5 µA @ 1 V), and forward voltage (1.5 V @ 100 mA).

Q: Why is the CLL4679 TR listed as obsolete?

A: The CLL4679 TR is classified as obsolete by the manufacturer. The CMHZ4679 TR is an active product offering equivalent electrical performance in an alternative package format.

Q: Does package change affect circuit performance?

A: Package change does not affect electrical performance. SOD-123 and SOD-80 are both surface mount packages with equivalent electrical characteristics. PCB layout, thermal management, and assembly compatibility must be evaluated for the specific application.

Q: What compliance certifications apply to both parts?

A: Both parts carry ECCN EAR99 classification and HTSUS code 8541.10.0050. The CMHZ4679 TR includes REACH Unaffected status.

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