CLL5230B BK Zener Diode Equivalent & Substitute Parts

Part Overview

The CLL5230B BK is a 4.7 V Zener diode rated at 500 mW, manufactured by Central Semiconductor Corp in a surface mount SOD-80 (DO-213AC, MINI-MELF) package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity. The part operates across a temperature range of -65°C to 200°C and features ±5% voltage tolerance with a maximum impedance of 19 Ohms.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	4.7	V
Tolerance	±5%	%
Power - Maximum	500	mW
Impedance (Maximum)	19	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 2 V
Voltage - Forward (Maximum) @ If	1.25	V @ 200 mA
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 CLL5230B BK is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Zener voltage: 4.7 V nominal
Tolerance: ±5%
Power dissipation: 500 mW maximum
Impedance: 19 Ohms maximum
Reverse leakage current: 5 µA @ 2 V
Package type: SOD-80 (DO-213AC, MINI-MELF)
Mounting: Surface mount

The substitute part TZM5230B-GS08 meets all electrical specifications and maintains identical package compatibility. Substitution is valid where these parameters align precisely with circuit design requirements.

Parameter Comparison

Parameter	CLL5230B BK	TZM5230B-GS08	Match Status
Voltage - Zener (Nominal)	4.7 V	4.7 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Maximum	500 mW	500 mW	Equivalent
Impedance (Maximum)	19 Ohms	19 Ohms	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 2 V	5 µA @ 2 V	Equivalent
Voltage - Forward (Maximum) @ If	1.25 V @ 200 mA	1.1 V @ 200 mA	Compatible (Lower Vf)
Operating Temperature Range	-65 to 200°C	175°C (Max)	Reduced Upper Limit
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent
Product Status	Obsolete	Active	Active Alternative Available
RoHS Status	Not specified	ROHS3 Compliant	Compliance Advantage

Engineering Selection Recommendations

The TZM5230B-GS08 manufactured by Vishay General Semiconductor - Diodes Division is the designated manufacturer-recommended substitute for the obsolete CLL5230B BK. This part maintains electrical equivalence across all critical parameters including zener voltage, tolerance, power rating, impedance, and reverse leakage specifications.

Selection Basis:

The TZM5230B-GS08 is classified as an active product with current production and inventory availability (16,910 pieces in stock), providing supply chain continuity for the obsolete CLL5230B BK. Both components share identical SOD-80 package geometry and surface mount configuration, enabling direct board-level substitution without layout modification.

The substitute part demonstrates improved forward voltage characteristics (1.1 V @ 200 mA versus 1.25 V @ 200 mA), resulting in lower power dissipation during forward conduction. The TZM5230B-GS08 carries ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements.

Operating temperature specification for the TZM5230B-GS08 is rated to 175°C maximum junction temperature, compared to 200°C for the original part. Circuit designs operating within the 175°C thermal envelope experience no functional limitation. Applications requiring operation above 175°C require thermal analysis to confirm compatibility.

Frequently Asked Questions (FAQ)

Q: Can the TZM5230B-GS08 be used as a direct replacement for CLL5230B BK in existing designs?

A: Yes. The TZM5230B-GS08 is electrically equivalent across all specified parameters: 4.7 V zener voltage, ±5% tolerance, 500 mW power rating, 19 Ohms maximum impedance, and identical SOD-80 package configuration. No circuit modification is required for substitution.

Q: What is the difference in forward voltage between these parts?

A: The CLL5230B BK specifies 1.25 V maximum forward voltage at 200 mA, while the TZM5230B-GS08 specifies 1.1 V maximum at the same current. The substitute part exhibits lower forward voltage drop, reducing power dissipation during forward conduction operation.

Q: Are there temperature rating differences between the parts?

A: The CLL5230B BK operates from -65°C to 200°C junction temperature. The TZM5230B-GS08 is rated to 175°C maximum. For applications operating within the 0°C to 175°C range, no thermal limitation exists. Designs requiring operation above 175°C must verify thermal performance under specific circuit conditions.

Q: Is the TZM5230B-GS08 available in the same package as the original part?

A: Yes. Both components use the SOD-80 package (DO-213AC, MINI-MELF) in surface mount configuration. Footprint and solder pad geometry are identical, permitting direct PCB substitution without layout changes.

Q: What is the product status difference, and why does it matter?

A: The CLL5230B BK is classified as obsolete, indicating discontinued production and limited availability. The TZM5230B-GS08 is an active product with ongoing manufacturing and 16,910 pieces currently in stock. Substitution ensures long-term supply chain reliability and design continuity.

Q: Does the TZM5230B-GS08 meet current regulatory compliance standards?

A: Yes. The TZM5230B-GS08 is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The original CLL5230B BK compliance status is not specified in available documentation.

Q: Are the impedance and reverse leakage specifications identical?

A: Yes. Both parts specify 19 Ohms maximum impedance and 5 µA reverse leakage current at 2 V. These parameters are equivalent and do not affect substitution compatibility.

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