CLL4685 TR Zener Diode 3.6V 500mW Equivalent & Substitute Parts

Part Overview

The CLL4685 TR is a 3.6 V Zener diode rated at 500 mW in SOD-80 (MINI-MELF) surface mount packaging, manufactured by Central Semiconductor Corp. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. 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)	3.6	V
Power - Maximum	500	mW
Tolerance	±5%	-
Voltage - Forward (Max) @ If	1.5 V @ 100 mA	-
Current - Reverse Leakage @ Vr	7.5 µA @ 2 V	-
Operating Temperature Range	-65°C to 200°C	TJ
Mounting Type	Surface Mount	-
Package / Case	DO-213AC, MINI-MELF, SOD-80	-

Substitute Part Grouping Explanation

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

Primary Substitution Criteria:

Zener voltage (Vz): 3.6 V nominal
Maximum power dissipation: 500 mW
Voltage tolerance: ±5% or tighter
Package type: SOD-80 (MINI-MELF) surface mount
Forward voltage and reverse leakage characteristics within acceptable operating ranges

Substitution Logic:

Parts are grouped into two categories based on package compatibility and product status:

Category 1: SOD-80 Package (Direct Mechanical Substitutes) These parts maintain the same SOD-80 (MINI-MELF) package footprint as the CLL4685 TR, enabling direct PCB placement without layout modifications. All substitute parts in this category meet the 3.6 V nominal zener voltage and 500 mW power rating requirements.

Category 2: Alternative Package (SOD-123) The CMHZ4685 TR uses SOD-123 packaging, which differs mechanically from SOD-80. This part is electrically equivalent but requires PCB layout redesign for implementation.

All substitute parts listed are active products with current manufacturing status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Vf (Max) @ If	Ir @ Vr	Temp Range (°C)	Package	Status
CLL4685 TR	Central Semiconductor Corp	3.6	±5%	500	1.5 V @ 100 mA	7.5 µA @ 2 V	-65 to 200	SOD-80	Obsolete
CMHZ4685 TR	Central Semiconductor Corp	3.6	±5%	500	1.5 V @ 100 mA	7.5 µA @ 2 V	-65 to 150	SOD-123	Active
TLZ3V6A-GS18	Vishay General Semiconductor	3.6	-	500	1.5 V @ 200 mA	5 µA @ 1 V	-65 to 175	SOD-80	Active
TLZ3V6B-GS08	Vishay General Semiconductor	3.6	-	500	1.5 V @ 200 mA	5 µA @ 1 V	-65 to 175	SOD-80	Active
TLZ3V6B-GS18	Vishay General Semiconductor	3.6	-	500	1.5 V @ 200 mA	5 µA @ 1 V	-65 to 175	SOD-80	Active
TZM5227B-GS08	Vishay General Semiconductor	3.6	±5%	500	1.1 V @ 200 mA	15 µA @ 1 V	-65 to 175	SOD-80	Active
TZM5227B-GS18	Vishay General Semiconductor	3.6	±5%	500	1.1 V @ 200 mA	15 µA @ 1 V	-65 to 175	SOD-80	Active
TZMB3V6-GS08	Vishay General Semiconductor	3.6	±2%	500	1.5 V @ 200 mA	2 µA @ 1 V	-65 to 175	SOD-80	Active

Engineering Selection Recommendations

For Direct Replacement (Same Package, Same Footprint):

The Vishay General Semiconductor TLZ3V6B-GS08, TLZ3V6B-GS18, TLZ3V6A-GS18, TZM5227B-GS08, and TZM5227B-GS18 are all active products in SOD-80 packaging and provide electrical equivalence to the obsolete CLL4685 TR. These parts maintain the same mechanical footprint, eliminating PCB redesign requirements.

The TZMB3V6-GS08 offers enhanced performance characteristics with ±2% voltage tolerance (tighter than the original ±5%), lower reverse leakage current (2 µA @ 1 V versus 7.5 µA @ 2 V), and AEC-Q101 automotive qualification. This part is suitable for applications requiring higher precision and reliability standards.

For Alternative Package Implementation:

The CMHZ4685 TR from Central Semiconductor Corp provides electrical equivalence with identical voltage and power specifications but uses SOD-123 packaging. This option requires PCB layout modification and is suitable only when package footprint flexibility exists. The operating temperature range is reduced to -65°C to 150°C compared to the original -65°C to 200°C specification.

Compliance and Availability:

All recommended substitute parts carry ROHS3 compliance and REACH unaffected status. Vishay parts include MSL 1 (Unlimited) moisture sensitivity rating. The TZM5227B series and TZMB3V6-GS08 maintain the highest inventory levels (22,900 and 20,100 units respectively), ensuring supply continuity.

Frequently Asked Questions (FAQ)

Q: Can the CLL4685 TR be replaced with any 3.6V Zener diode?

A: No. Substitution requires matching the 500 mW power rating, SOD-80 package type, and electrical characteristics including forward voltage and reverse leakage specifications. The package footprint must be compatible with existing PCB layouts unless redesign is acceptable.

Q: What is the difference between SOD-80 and SOD-123 packages?

A: SOD-80 (MINI-MELF) and SOD-123 are different surface mount package formats with distinct footprints and land patterns. SOD-80 is a cylindrical package, while SOD-123 is rectangular. Direct substitution between these packages requires PCB layout modification. The CMHZ4685 TR uses SOD-123 and cannot be placed on a PCB designed for SOD-80 without rework.

Q: Why do some substitute parts have different voltage tolerances?

A: Voltage tolerance reflects manufacturing precision. The original CLL4685 TR specifies ±5% tolerance. The TZMB3V6-GS08 offers ±2% tolerance, indicating tighter voltage regulation. The TLZ series parts do not specify tolerance in the provided data. Selection depends on application requirements for voltage accuracy.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. The TZMB3V6-GS08 carries this qualification, indicating it meets automotive reliability and performance standards. This certification is relevant for automotive and high-reliability applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance status, meeting European Union Restriction of Hazardous Substances regulations.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current (Ir) indicates the small current flowing through the diode in reverse bias. Lower leakage current (such as 2 µA in TZMB3V6-GS08 versus 7.5 µA in CLL4685 TR) represents better diode quality and lower power consumption in standby conditions. Higher leakage (15 µA in TZM5227B series) is still within acceptable ranges for most applications but may impact low-power circuit performance.

Q: Can I use the TZMB3V6-GS08 in place of CLL4685 TR without circuit modifications?

A: The TZMB3V6-GS08 is electrically and mechanically compatible with the CLL4685 TR. Both use SOD-80 packaging and meet the 3.6 V, 500 mW specifications. The tighter ±2% tolerance and lower reverse leakage of the TZMB3V6-GS08 represent performance improvements that do not require circuit modifications. Direct PCB substitution is possible.

Q: What is the difference between tape and reel (TR) packaging options?

A: Tape and reel (TR) packaging refers to the delivery format for automated assembly. Parts are wound on tape and reel for pick-and-place machine compatibility. This is a supply format distinction, not an electrical or mechanical difference. All parts listed with TR designation are suitable for automated assembly processes.

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