CLL4711 BK Zener Diode Equivalent & Substitute Parts

Part Overview

The CLL4711 BK is a 27 V, 500 mW Zener diode manufactured by Central Semiconductor Corp in the SOD-80 (DO-213AC, MINI-MELF) surface mount package. This component is classified as obsolete, indicating discontinued production and limited availability for new designs. Identification of equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this Zener diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	27	V
Tolerance	±5	%
Power - Maximum	500	mW
Current - Reverse Leakage @ Vr	10 nA @ 20.4 V	nA
Voltage - Forward (Max) @ If	1.5 V @ 100 mA	V
Operating Temperature Range	-65 to 200	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-80 (DO-213AC, MINI-MELF)	—

Substitute Part Grouping Explanation

Substitution of the CLL4711 BK is determined by strict equivalence of the following electrical parameters: Zener voltage (27 V nominal), voltage tolerance (±5%), maximum power dissipation (500 mW), reverse leakage current (10 nA @ 20.4 V), and forward voltage characteristics (1.5 V @ 100 mA). The primary distinction between the main part and identified substitutes is the package configuration. The CLL4711 BK utilizes the SOD-80 package, while substitute parts may employ alternative surface mount packages such as SOD-123. Mechanical compatibility with printed circuit board layouts and assembly equipment must be evaluated based on specific package dimensions and land pattern requirements. Operating temperature range variations between parts must be assessed against application requirements.

Parameter Comparison

Parameter	CLL4711 BK (Main Part)	CMHZ4711 BK (Substitute)	Compatibility Notes
Manufacturer	Central Semiconductor Corp	Central Semiconductor Corp	Same manufacturer
Voltage - Zener (Nom)	27 V	27 V	Electrically equivalent
Tolerance	±5%	±5%	Electrically equivalent
Power - Max	500 mW	500 mW	Electrically equivalent
Current - Reverse Leakage @ Vr	10 nA @ 20.4 V	10 nA @ 20.4 V	Electrically equivalent
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 100 mA	1.5 V @ 100 mA	Electrically equivalent
Operating Temperature Range	-65 to 200°C	-65 to 150°C	Substitute has reduced upper limit
Mounting Type	Surface Mount	Surface Mount	Both surface mount
Package / Case	SOD-80 (DO-213AC, MINI-MELF)	SOD-123	Different package; PCB layout modification required
Product Status	Obsolete	Active	Substitute is in active production

Engineering Selection Recommendations

The CMHZ4711 BK represents an active production equivalent to the obsolete CLL4711 BK, with identical electrical specifications across all critical parameters: Zener voltage, tolerance, power rating, reverse leakage current, and forward voltage characteristics. The primary engineering consideration is the package transition from SOD-80 to SOD-123. This package change requires evaluation of printed circuit board layout compatibility, including land pattern modifications and assembly process adjustments. The CMHZ4711 BK operates within a reduced temperature range (-65 to 150°C versus -65 to 200°C), which must be verified against application maximum junction temperature requirements. For applications operating above 150°C, the CLL4711 BK's extended temperature capability cannot be replicated by the CMHZ4711 BK. The CMHZ4711 BK's active product status ensures ongoing availability and supply chain continuity compared to the obsolete CLL4711 BK.

Frequently Asked Questions (FAQ)

Q: What are the primary electrical differences between CLL4711 BK and CMHZ4711 BK?

A: There are no electrical differences. Both parts share identical Zener voltage (27 V), tolerance (±5%), power rating (500 mW), reverse leakage current (10 nA @ 20.4 V), and forward voltage characteristics (1.5 V @ 100 mA).

Q: Can CMHZ4711 BK be used as a direct replacement for CLL4711 BK?

A: Electrical substitution is valid. However, mechanical substitution requires PCB layout modification due to the package change from SOD-80 to SOD-123. Assembly equipment compatibility must be verified.

Q: What is the impact of the operating temperature range difference?

A: The CLL4711 BK operates to 200°C junction temperature, while CMHZ4711 BK operates to 150°C. Applications requiring operation above 150°C cannot use the CMHZ4711 BK substitute. Verify application maximum junction temperature requirements before selection.

Q: Why is the CLL4711 BK listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The CMHZ4711 BK is an active production alternative with equivalent electrical performance.

Q: Are there other substitute parts available for the CLL4711 BK?

A: The CMHZ4711 BK substitute list includes cross-references to MMSZ5254B-TP, DDZ9711-7, DDZ27DS-7, SZMMSZ4711T3G, and BZT52C27-7-F. These parts share the 27 V Zener voltage specification and may offer alternative package options.

Q: What package considerations apply to the SOD-123 substitute?

A: SOD-123 is a smaller surface mount package compared to SOD-80 (MINI-MELF). PCB land patterns, component placement, and assembly process parameters differ. Design verification and prototype testing are required to confirm mechanical and thermal performance in the target application.

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