CLL4685 BK Zener Diode 3.6V 500mW SOD-80 Equivalent & Substitute Parts

Part Overview

The CLL4685 BK is a 3.6 V Zener diode rated at 500 mW in a surface mount SOD-80 (DO-213AC, MINI-MELF) package manufactured by Central Semiconductor Corp. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Zener diodes in this voltage and power rating are used for voltage regulation, overvoltage protection, and reference applications in electronic circuits. The obsolete status necessitates evaluation of active alternative components that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	CLL4685 BK	Unit
Voltage - Zener (Nominal)	3.6	V
Tolerance	±5%	-
Power - Maximum	500	mW
Current - Reverse Leakage @ Vr	7.5 µA @ 2 V	µA
Voltage - Forward (Max) @ If	1.5 V @ 100 mA	V
Operating Temperature Range	-65°C to 200°C	°C
Mounting Type	Surface Mount	-
Package / Case	DO-213AC, MINI-MELF, SOD-80	-
Product Status	Obsolete	-

Substitute Part Grouping Explanation

Substitution of the CLL4685 BK is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage: 3.6 V nominal
Power dissipation: 500 mW maximum
Package type: SOD-80 (DO-213AC, MINI-MELF) surface mount
Mounting type: Surface mount

Secondary Compatibility Factors:

Voltage tolerance (±5% or tighter)
Reverse leakage current characteristics
Forward voltage drop
Operating temperature range capability
RoHS and REACH compliance status

Substitute parts are grouped into two categories:

Category 1: Same Manufacturer, Different Package The CMHZ4685 BK from Central Semiconductor Corp maintains identical electrical specifications (3.6 V, 500 mW, ±5% tolerance) but uses SOD-123 packaging instead of SOD-80. This part is active and suitable for designs where package footprint change is acceptable.

Category 2: Alternative Manufacturers, SOD-80 Package Vishay General Semiconductor - Diodes Division offers multiple SOD-80 packaged alternatives in the TLZ and TZM series. These parts maintain the 3.6 V nominal voltage and 500 mW power rating while offering variations in tolerance, impedance, leakage current, and temperature range specifications. All Vishay alternatives are active products with RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Package	Status	Temp Range (°C)	RoHS
CLL4685 BK	Central Semiconductor	3.6	±5%	500	SOD-80	Obsolete	-65 to 200	-
CMHZ4685 BK	Central Semiconductor	3.6	±5%	500	SOD-123	Active	-65 to 150	-
TLZ3V6A-GS18	Vishay	3.6	-	500	SOD-80	Active	-65 to 175	ROHS3
TLZ3V6B-GS08	Vishay	3.6	-	500	SOD-80	Active	-65 to 175	ROHS3
TLZ3V6B-GS18	Vishay	3.6	-	500	SOD-80	Active	-65 to 175	ROHS3
TZM5227B-GS08	Vishay	3.6	±5%	500	SOD-80	Active	-65 to 175	ROHS3
TZM5227B-GS18	Vishay	3.6	±5%	500	SOD-80	Active	-65 to 175	ROHS3
TZMB3V6-GS18	Vishay	3.6	±2%	500	SOD-80	Active	-65 to 175	ROHS3

Engineering Selection Recommendations

For Direct SOD-80 Package Replacement:

The Vishay TLZ and TZM series zener diodes provide direct mechanical and electrical substitution for the CLL4685 BK. All Vishay alternatives are active products with RoHS3 compliance and REACH unaffected status, ensuring long-term availability and regulatory compliance.

TZM5227B-GS08 and TZM5227B-GS18 are recommended as primary substitutes. These parts maintain the ±5% tolerance specification of the original CLL4685 BK, ensuring compatibility with designs that depend on this tolerance band. Both variants are available in high inventory quantities (22,900 and 623 units respectively) and operate across the -65°C to 175°C temperature range.

TZMB3V6-GS18 offers superior tolerance performance at ±2% and includes AEC-Q101 automotive qualification. This part is suitable for applications requiring tighter voltage regulation or automotive-grade reliability. The operating temperature range extends to 175°C, which is lower than the original part's 200°C maximum but adequate for most industrial and commercial applications.

TLZ3V6A-GS18, TLZ3V6B-GS08, and TLZ3V6B-GS18 provide alternative specifications with different impedance and leakage characteristics. These parts operate to 175°C and are suitable for applications where the specific impedance and leakage parameters align with circuit requirements.

For Package Footprint Change:

The CMHZ4685 BK from Central Semiconductor Corp maintains identical electrical specifications (3.6 V, 500 mW, ±5% tolerance) but uses SOD-123 packaging. This part is active and suitable only for designs where PCB layout modification to accommodate SOD-123 footprint is feasible. The operating temperature range is limited to -65°C to 150°C, which is lower than the original specification.

Compliance Considerations:

All Vishay alternatives carry RoHS3 compliance and REACH unaffected status, meeting modern environmental and regulatory requirements. The CMHZ4685 BK compliance status is not specified in available data.

Frequently Asked Questions (FAQ)

Q: Can I use CMHZ4685 BK as a direct replacement for CLL4685 BK?

A: The CMHZ4685 BK maintains identical electrical specifications (3.6 V, 500 mW, ±5% tolerance) but uses SOD-123 packaging instead of SOD-80. Direct PCB substitution is not possible without footprint modification. The operating temperature range is also reduced to -65°C to 150°C. Use this part only if PCB layout changes are acceptable for your application.

Q: What is the difference between TLZ3V6 and TZM5227B series?

A: Both series provide 3.6 V, 500 mW zener diodes in SOD-80 packaging. The TZM5227B series maintains the ±5% tolerance of the original CLL4685 BK and offers lower impedance (24 Ohms maximum). The TLZ3V6 series does not specify tolerance in the available data and offers higher impedance (60 Ohms maximum). Selection depends on circuit impedance requirements and tolerance specifications.

Q: Are all Vishay substitutes RoHS compliant?

A: Yes. All Vishay alternatives listed (TLZ3V6A-GS18, TLZ3V6B-GS08, TLZ3V6B-GS18, TZM5227B-GS08, TZM5227B-GS18, and TZMB3V6-GS18) carry RoHS3 compliance and REACH unaffected status.

Q: Which substitute offers the tightest voltage tolerance?

A: The TZMB3V6-GS18 offers ±2% tolerance, which is tighter than the original CLL4685 BK specification of ±5%. This part also includes AEC-Q101 automotive qualification and is suitable for applications requiring superior voltage regulation accuracy.

Q: What is the maximum operating temperature for substitute parts?

A: Vishay alternatives operate to 175°C maximum junction temperature, which is lower than the original CLL4685 BK specification of 200°C. The CMHZ4685 BK is limited to 150°C. For applications requiring operation above 175°C, the original CLL4685 BK specification cannot be matched by the listed substitutes.

Q: Are the GS08 and GS18 variants interchangeable?

A: The GS08 and GS18 designations indicate different tape reel configurations for automated assembly. Electrically and mechanically, these variants are identical. Selection depends on your assembly equipment and tape reel specifications. Both variants are available for TLZ3V6B, TZM5227B, and TZMB3V6 series.

Q: What inventory levels are available for substitute parts?

A: Inventory availability varies: TZM5227B-GS08 (22,900 units), TLZ3V6B-GS08 (1,350 units), TLZ3V6A-GS18 (1,103 units), TLZ3V6B-GS18 (1,108 units), TZMB3V6-GS18 (794 units), and TZM5227B-GS18 (623 units). TZM5227B-GS08 offers the highest availability for high-volume production requirements.

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