CLL5228B BK Zener Diode Equivalent & Substitute Parts

Part Overview

The CLL5228B BK is a 3.9 V, 500 mW Zener diode manufactured by Central Semiconductor Corp in SOD-80 surface mount 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 and is non-RoHS compliant. Substitute parts must maintain electrical equivalence in Zener voltage, power dissipation, and package form factor while meeting current compliance standards.

Key Parameters

Parameter	CLL5228B BK
Voltage - Zener (Nom)	3.9 V
Power - Max	500 mW
Tolerance	±5%
Impedance (Max)	23 Ohms
Current - Reverse Leakage @ Vr	10 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA
Operating Temperature	-65°C ~ 200°C
Mounting Type	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the CLL5228B BK is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage: 3.9 V nominal
Power dissipation: 500 mW maximum
Package type: SOD-80 (DO-213AC, MINI-MELF)
Mounting: Surface mount

Acceptable Parameter Variations:

Impedance (Zzt): The main part specifies 23 Ohms maximum; substitute parts with higher impedance values (up to 50 Ohms) remain functionally compatible within typical circuit applications
Reverse leakage current: Substitute parts with lower leakage (3 µA @ 1 V versus 10 µA @ 1 V) provide improved performance characteristics
Forward voltage: Substitute parts with higher Vf (1.5 V @ 200 mA versus 1.25 V @ 200 mA) remain acceptable for most applications
Operating temperature upper limit: Substitute parts rated to 175°C versus 200°C are acceptable for standard industrial applications

The substitute parts TLZ3V9A-GS08 and TLZ3V9A-GS18 from Vishay General Semiconductor - Diodes Division meet all primary substitution criteria and are classified as active products with current RoHS3 compliance.

Parameter Comparison

Parameter	CLL5228B BK	TLZ3V9A-GS08	TLZ3V9A-GS18
Voltage - Zener (Nom)	3.9 V	3.9 V	3.9 V
Power - Max	500 mW	500 mW	500 mW
Impedance (Max)	23 Ohms	50 Ohms	50 Ohms
Current - Reverse Leakage @ Vr	10 µA @ 1 V	3 µA @ 1 V	3 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 200°C	-65°C ~ 175°C	-65°C ~ 175°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	-	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

TLZ3V9A-GS08 and TLZ3V9A-GS18 Selection:

Both TLZ3V9A-GS08 and TLZ3V9A-GS18 are direct functional equivalents for the obsolete CLL5228B BK. The primary distinction between these two substitute parts is packaging configuration: TLZ3V9A-GS08 and TLZ3V9A-GS18 differ in tape reel specifications for automated assembly processes.

Compliance Advantages:

Both substitute parts are classified as active products with current manufacturing support
Both achieve ROHS3 compliance, addressing regulatory requirements for new designs
Both maintain REACH unaffected status and EAR99 export classification

Electrical Compatibility:

Identical Zener voltage (3.9 V) and power rating (500 mW) ensure direct functional replacement
Improved reverse leakage characteristics (3 µA versus 10 µA) provide superior performance
Higher impedance specification (50 Ohms versus 23 Ohms) remains acceptable for standard circuit applications
Slightly elevated forward voltage (1.5 V versus 1.25 V) introduces negligible impact in typical voltage regulation circuits

Temperature Consideration: Applications requiring operation above 175°C must evaluate the reduced upper temperature limit of substitute parts relative to the original CLL5228B BK specification of 200°C.

Frequently Asked Questions (FAQ)

Q: Can TLZ3V9A-GS08 and TLZ3V9A-GS18 be used interchangeably with CLL5228B BK?

A: Yes. Both substitute parts meet the electrical and mechanical requirements for direct replacement. The primary difference between TLZ3V9A-GS08 and TLZ3V9A-GS18 relates to tape reel specifications for automated pick-and-place assembly. Electrical performance is identical between these two variants.

Q: What is the impact of the higher impedance specification in substitute parts?

A: The substitute parts specify 50 Ohms maximum impedance compared to 23 Ohms for the original part. This parameter affects transient response characteristics in voltage regulation circuits. For standard applications, this difference remains within acceptable operating margins. Circuit-specific analysis is required only for applications with stringent transient response requirements.

Q: Are the substitute parts suitable for applications requiring operation above 175°C?

A: No. The substitute parts are rated to 175°C maximum, while the original CLL5228B BK operates to 200°C. Applications requiring sustained operation above 175°C must retain the original part or identify alternative components with higher temperature ratings.

Q: What is the significance of RoHS3 compliance in the substitute parts?

A: RoHS3 compliance indicates conformance to current European Union Restriction of Hazardous Substances regulations. This certification is required for components used in new product designs and for distribution within regulated markets. The original CLL5228B BK is non-compliant, making the RoHS3-compliant substitutes necessary for regulatory adherence.

Q: How do the reverse leakage characteristics compare?

A: The substitute parts exhibit lower reverse leakage current (3 µA @ 1 V) compared to the original part (10 µA @ 1 V). Lower leakage current improves circuit performance in precision voltage reference and regulation applications.

Q: Are there packaging considerations for automated assembly?

A: Both substitute parts are supplied in Tape & Reel (TR) packaging, suitable for automated surface mount assembly processes. The SOD-80 package form factor remains identical to the original part, ensuring compatibility with existing PCB layouts and pick-and-place equipment.

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