CLL4104 BK TIN/LEAD Zener Diode Equivalent & Substitute Parts

Part Overview

The CLL4104 BK TIN/LEAD is a surface mount Zener diode manufactured by Central Semiconductor Corp, rated at 10 V nominal Zener voltage with 500 mW maximum power dissipation. The device is packaged in DO-213AC (MINI-MELF, SOD-80) configuration and operates across a temperature range of -65°C to 200°C.

This part is classified as obsolete. Identification of equivalent and substitute components is necessary to support ongoing design requirements, system maintenance, and production continuity where the original part is no longer available through standard distribution channels.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	10	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	200	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 7.6 V
Voltage - Forward (Vf) (Max) @ If	1	V @ 200 mA
Operating Temperature Range	-65 to 200	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	DO-213AC, MINI-MELF, SOD-80	—

Substitute Part Grouping Explanation

Substitution of the CLL4104 BK TIN/LEAD is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Zener voltage (Vz): 10 V nominal
Tolerance: ±5%
Maximum power dissipation: 500 mW
Impedance (Zzt): 200 Ohms maximum
Reverse leakage current: 1 µA @ 7.6 V
Forward voltage characteristics

Mechanical Compatibility Criteria:

Surface mount mounting type
Package footprint and form factor

The CMHZ4104 BK TIN/LEAD meets the electrical specifications of the CLL4104 across all primary parameters. However, the substitute part utilizes a different package configuration (SOD-123 versus SOD-80), which introduces a mechanical incompatibility requiring PCB layout and footprint redesign.

Parameter Comparison

Parameter	CLL4104 BK TIN/LEAD	CMHZ4104 BK TIN/LEAD	Match Status
Manufacturer	Central Semiconductor Corp	Central Semiconductor Corp	Identical
Category	Diodes, Zener	Diodes, Zener	Identical
Voltage - Zener (Nom)	10 V	10 V	Identical
Tolerance	±5%	±5%	Identical
Power - Max	500 mW	500 mW	Identical
Impedance (Max)	200 Ohms	200 Ohms	Identical
Current - Reverse Leakage @ Vr	1 µA @ 7.6 V	1 µA @ 7.6 V	Identical
Voltage - Forward (Vf) (Max) @ If	1 V @ 200 mA	1.5 V @ 100 mA	Different
Operating Temperature Range	-65°C to 200°C (TJ)	-65°C to 150°C (TJ)	Different
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	DO-213AC, MINI-MELF, SOD-80	SOD-123	Different
Product Status	Obsolete	Active	Different

Engineering Selection Recommendations

CMHZ4104 BK TIN/LEAD Substitution Assessment:

The CMHZ4104 BK TIN/LEAD provides electrical equivalence to the CLL4104 BK TIN/LEAD across all primary Zener diode specifications: nominal voltage, tolerance, power rating, impedance, and reverse leakage characteristics. Both devices are manufactured by Central Semiconductor Corp and maintain identical electrical performance in the core Zener function.

Considerations for Implementation:

The CMHZ4104 operates with a maximum junction temperature of 150°C, compared to the CLL4104's 200°C rating. Applications requiring sustained operation above 150°C require thermal analysis to confirm the substitute part remains within acceptable operating limits.

The forward voltage characteristic differs between the two parts (1.5 V @ 100 mA for CMHZ4104 versus 1 V @ 200 mA for CLL4104). This difference is relevant only in forward-biased circuit configurations and does not affect standard Zener regulation applications.

The package transition from SOD-80 to SOD-123 requires PCB footprint modification. Both packages are industry-standard surface mount configurations with established design guidelines and manufacturing processes.

The CMHZ4104 maintains active product status, ensuring ongoing availability and supply chain continuity compared to the obsolete CLL4104.

Frequently Asked Questions (FAQ)

Q: Can the CMHZ4104 BK TIN/LEAD be used as a direct drop-in replacement for the CLL4104 BK TIN/LEAD?

A: The CMHZ4104 provides electrical equivalence but not mechanical compatibility. The package change from SOD-80 to SOD-123 requires PCB footprint redesign. Direct soldering into existing CLL4104 pads is not possible without layout modification.

Q: What is the impact of the different operating temperature ranges?

A: The CLL4104 operates to 200°C junction temperature, while the CMHZ4104 operates to 150°C. For applications operating below 150°C, the CMHZ4104 is fully suitable. Applications requiring sustained operation between 150°C and 200°C require thermal verification to confirm the substitute part remains within acceptable limits.

Q: Are the forward voltage differences significant for Zener diode applications?

A: Forward voltage characteristics are relevant only when the diode conducts in the forward direction. In standard Zener regulation circuits, the diode operates in reverse bias, and forward voltage specifications do not affect circuit performance. Forward voltage becomes relevant in applications involving forward current conduction or bidirectional operation.

Q: What are the package footprint differences between SOD-80 and SOD-123?

A: SOD-80 (MINI-MELF) and SOD-123 are both surface mount packages but have different physical dimensions and pad layouts. SOD-123 is a smaller package. PCB layout modification is required to accommodate the different footprint. Consult manufacturer datasheets for precise dimensional specifications.

Q: Is the CMHZ4104 available in the same tin/lead finish as the CLL4104?

A: The CMHZ4104 BK TIN/LEAD designation indicates tin/lead finish compatibility with the CLL4104 BK TIN/LEAD. Both parts use identical finish specifications.

Q: What is the significance of the different product statuses?

A: The CLL4104 is classified as obsolete, indicating it is no longer manufactured or supported by the supplier. The CMHZ4104 maintains active status, ensuring continued availability, technical support, and supply chain reliability for new designs and ongoing production requirements.

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