CLL5231B BK Zener Diode Equivalent & Substitute Parts

Part Overview

The CLL5231B BK is a 5.1 V, 500 mW surface mount zener diode manufactured by Central Semiconductor Corp in the SOD-80 (DO-213AC, MINI-MELF) package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a temperature range of -65°C to 200°C with ±5% voltage tolerance and is suitable for voltage regulation and protection applications in surface mount assemblies.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	5.1	V
Power - Maximum	500	mW
Tolerance	±5%	-
Impedance (Maximum)	17	Ohms
Current - Reverse Leakage @ 2 V	5	µA
Voltage - Forward (Maximum) @ 200 mA	1.25	V
Operating Temperature Range	-65 to 200	°C
Mounting Type	Surface Mount	-
Package / Case	DO-213AC, MINI-MELF, SOD-80	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the CLL5231B BK is based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage: 5.1 V nominal
Power dissipation: 500 mW maximum
Package type: SOD-80 (DO-213AC, MINI-MELF) surface mount
Mounting configuration: Surface mount compatible with original footprint

Allowed Parameter Variations:

Impedance (Zzt): Original specifies 17 Ohms maximum; substitutes with 20 Ohms maximum remain functionally equivalent within circuit design tolerances
Reverse leakage current: Original specifies 5 µA @ 2 V; substitutes with 2 µA @ 2 V represent improved performance
Forward voltage: Original specifies 1.25 V @ 200 mA; substitutes with 1.5 V @ 200 mA remain within acceptable operating parameters
Operating temperature upper limit: Original specifies 200°C; substitutes with 175°C upper limit are acceptable for standard industrial applications

The four Vishay TLZ series zener diodes listed below meet all substitution criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Parameter	CLL5231B BK	TLZ5V1B-GS08	TLZ5V1B-GS18	TLZ5V1C-GS08	TLZ5V1C-GS18
Manufacturer	Central Semiconductor Corp	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor
Voltage - Zener (Nom)	5.1 V	5.1 V	5.1 V	5.1 V	5.1 V
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	17 Ohms	20 Ohms	20 Ohms	20 Ohms	20 Ohms
Current - Reverse Leakage @ 2 V	5 µA	2 µA	2 µA	2 µA	2 µA
Voltage - Forward (Max) @ 200 mA	1.25 V	1.5 V	1.5 V	1.5 V	1.5 V
Operating Temperature	-65 to 200°C	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Request inventory verification	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: TLZ5V1B-GS18

The TLZ5V1B-GS18 is the preferred substitute for the obsolete CLL5231B BK. This part is manufactured by Vishay General Semiconductor - Diodes Division and carries active product status with 28,215 pieces in current inventory. The TLZ5V1B-GS18 meets all electrical specifications required for direct substitution, maintains identical package geometry (SOD-80 MiniMELF), and is ROHS3 compliant. The higher inventory availability ensures supply chain continuity for production requirements.

Secondary Recommendations: TLZ5V1B-GS08 and TLZ5V1C Series

The TLZ5V1B-GS08 (5,450 pieces in stock), TLZ5V1C-GS08 (17,700 pieces in stock), and TLZ5V1C-GS18 (797 pieces in stock) are functionally equivalent alternatives. All four Vishay substitutes share identical electrical performance characteristics and package specifications. Selection among these alternatives should be based on packaging format requirements (GS08 and GS18 designations indicate different tape and reel configurations) and inventory availability for specific procurement timelines.

Compliance Considerations

All recommended substitutes are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The original CLL5231B BK requires RoHS status verification before use in new designs. All substitute parts maintain MSL 1 (Unlimited) moisture sensitivity classification, eliminating special handling requirements during storage and assembly.

Frequently Asked Questions (FAQ)

Q: Can the TLZ5V1B-GS18 be used as a direct replacement for the CLL5231B BK in existing designs?

A: Yes. The TLZ5V1B-GS18 maintains identical zener voltage (5.1 V), power rating (500 mW), and SOD-80 package geometry. The component footprint and electrical performance are directly compatible with the original design. The 20 Ohm impedance specification (versus 17 Ohms in the original) and 1.5 V forward voltage (versus 1.25 V) remain within acceptable circuit design parameters for standard voltage regulation applications.

Q: What is the difference between TLZ5V1B and TLZ5V1C designations?

A: The TLZ5V1B and TLZ5V1C designations represent different tolerance or performance grades within the Vishay TLZ5V1 base product family. Both variants meet the electrical specifications required for substitution of the CLL5231B BK. Selection between these variants should be based on specific circuit requirements and availability.

Q: What do the GS08 and GS18 suffixes indicate?

A: The GS08 and GS18 suffixes designate different tape and reel packaging configurations for surface mount assembly. GS08 and GS18 refer to different reel sizes or tape specifications used in automated pick-and-place equipment. The electrical performance and package footprint remain identical between these variants. Selection should be based on your assembly equipment compatibility and procurement requirements.

Q: Is the operating temperature difference between the original (200°C max) and substitutes (175°C max) significant?

A: For standard industrial and commercial applications operating below 175°C, the substitute parts are fully equivalent. The CLL5231B BK's extended 200°C upper limit is not required for typical voltage regulation circuits. If your application requires operation above 175°C, the original part specification must be retained or alternative components evaluated.

Q: Are all four Vishay substitutes electrically interchangeable?

A: Yes. The TLZ5V1B-GS08, TLZ5V1B-GS18, TLZ5V1C-GS08, and TLZ5V1C-GS18 are electrically interchangeable for the CLL5231B BK application. All four parts share identical zener voltage, power rating, impedance, reverse leakage, forward voltage, and operating temperature specifications. Differences are limited to packaging format (tape and reel configuration) and inventory availability.

Q: What compliance certifications apply to the substitute parts?

A: All four Vishay TLZ series substitutes are ROHS3 compliant and REACH unaffected. These certifications meet current environmental regulations for electronic component manufacturing and use in the European Union and other regulated markets. The original CLL5231B BK requires RoHS status verification before incorporation into new designs.

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