CLL4705 TR Equivalent & Substitute Parts

Part Overview

The CLL4705 TR is a Zener diode rated at 18 V, 500 mW, manufactured by Central Semiconductor Corp in SOD-80 (DO-213AC, MINI-MELF) surface mount package. This component is classified as obsolete, indicating that direct procurement from the original manufacturer may be limited or unavailable. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure supply chain reliability for applications requiring 18 V Zener diode functionality in surface mount configurations.

Key Parameters

Parameter	CLL4705 TR Value
Voltage - Zener (Nom) (Vz)	18 V
Power - Max	500 mW
Tolerance	±5%
Current - Reverse Leakage @ Vr	50 nA @ 13.6 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 100 mA
Operating Temperature	-65°C ~ 200°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the CLL4705 TR is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 18 V (exact match required)
Power - Max: 500 mW (exact match required)
Mounting Type: Surface Mount
Package / Case: SOD-80 (DO-213AC, MINI-MELF) or compatible surface mount package

Secondary Compatibility Factors:

Tolerance: ±5% or tighter
Operating Temperature Range: Must support application requirements
Current - Reverse Leakage: Lower or equivalent values acceptable
Voltage - Forward (Vf): Lower or equivalent values acceptable
Product Status: Active status preferred for long-term availability

Substitute parts are grouped into two categories:

Category 1: SOD-80 Package Equivalents (Direct Package Match) Parts maintaining the SOD-80 (DO-213AC, MINI-MELF) package format with 18 V, 500 mW specifications. These include Vishay TLZ series variants (TLZ18-GS08, TLZ18-GS18, TLZ18A-GS08, TLZ18A-GS18, TLZ18B-GS08, TLZ18B-GS18, TLZ18C-GS08) and Vishay TZM5248B series (TZM5248B-GS08, TZM5248B-GS18).

Category 2: Alternative Package Equivalent (SOD-123) The CMHZ4705 TR from Central Semiconductor Corp provides identical electrical specifications (18 V, 500 mW, ±5% tolerance) in SOD-123 package, suitable for applications where package footprint change is acceptable.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (mW)	Tolerance	Package	Product Status	Operating Temp (°C)
CLL4705 TR	Central Semiconductor Corp	18	500	±5%	SOD-80	Obsolete	-65 ~ 200
CMHZ4705 TR	Central Semiconductor Corp	18	500	±5%	SOD-123	Active	-65 ~ 150
TLZ18-GS08	Vishay General Semiconductor	18	500	—	SOD-80	Active	-65 ~ 175
TLZ18-GS18	Vishay General Semiconductor	18	500	—	SOD-80	Active	-65 ~ 175
TLZ18A-GS08	Vishay General Semiconductor	18	500	—	SOD-80	Active	-65 ~ 175
TLZ18A-GS18	Vishay General Semiconductor	18	500	—	SOD-80	Active	-65 ~ 175
TLZ18B-GS08	Vishay General Semiconductor	18	500	—	SOD-80	Active	-65 ~ 175
TLZ18B-GS18	Vishay General Semiconductor	18	500	—	SOD-80	Active	-65 ~ 175
TLZ18C-GS08	Vishay General Semiconductor	18	500	—	SOD-80	Active	-65 ~ 175
TZM5248B-GS08	Vishay General Semiconductor	18	500	±5%	SOD-80	Active	—
TZM5248B-GS18	Vishay General Semiconductor	18	500	±5%	SOD-80	Active	-65 ~ 175

Engineering Selection Recommendations

For Direct SOD-80 Package Replacement:

The Vishay TLZ series (TLZ18-GS08, TLZ18-GS18, TLZ18A-GS08, TLZ18A-GS18, TLZ18B-GS08, TLZ18B-GS18, TLZ18C-GS08) and TZM5248B series (TZM5248B-GS08, TZM5248B-GS18) provide active product status with identical 18 V, 500 mW specifications and SOD-80 package compatibility. All Vishay parts carry ROHS3 compliance and REACH Unaffected status. The TLZ18 variants support operating temperatures to 175°C, which is lower than the original CLL4705 TR specification of 200°C but suitable for most industrial applications. The TZM5248B variants maintain ±5% tolerance matching the original part.

For Alternative Package Consideration:

The CMHZ4705 TR from Central Semiconductor Corp maintains manufacturer continuity with identical electrical specifications (18 V, 500 mW, ±5% tolerance) and active product status. This part uses SOD-123 package, requiring PCB layout modification. Operating temperature range is -65°C to 150°C, which is lower than the original specification.

Selection Priority:

Vishay TLZ18B-GS18 or TLZ18B-GS08 for highest inventory availability and active status
Vishay TZM5248B-GS18 for ±5% tolerance specification match
CMHZ4705 TR if manufacturer continuity is required and package change is acceptable

Frequently Asked Questions (FAQ)

Q: Can I use TLZ18-GS08 as a direct replacement for CLL4705 TR?

A: Yes. Both parts share identical 18 V Zener voltage and 500 mW power rating in SOD-80 package. The TLZ18-GS08 is active product status with ROHS3 compliance. Operating temperature range differs (175°C vs. 200°C maximum), which is acceptable for applications not requiring the full 200°C specification.

Q: What is the difference between TLZ18-GS08 and TLZ18-GS18?

A: Both parts are electrically identical 18 V, 500 mW Zener diodes in SOD-80 package. The suffix designates tape reel packaging configuration (GS08 vs. GS18 refers to reel specifications). Selection depends on procurement and assembly requirements.

Q: Why does CMHZ4705 TR have a different operating temperature range?

A: The CMHZ4705 TR uses SOD-123 package, which has different thermal characteristics than SOD-80. The reduced maximum operating temperature (150°C vs. 200°C) reflects the thermal limitations of the smaller package. This part is suitable for applications operating within -65°C to 150°C range.

Q: Are all substitute parts RoHS compliant?

A: All Vishay substitute parts (TLZ and TZM5248B series) carry ROHS3 compliance certification. The CMHZ4705 TR does not specify RoHS status in provided data. Verify RoHS compliance requirements with your procurement specifications.

Q: What is the difference between TLZ18A and TLZ18B variants?

A: Both variants maintain 18 V, 500 mW specifications in SOD-80 package. Differences exist in reverse leakage current specifications (TLZ18A: 40 nA @ 15.4 V; TLZ18B: 40 nA @ 16 V). Both are suitable substitutes for the CLL4705 TR.

Q: Can I use TZM5248B-GS08 if operating temperature is not specified?

A: The TZM5248B-GS08 does not include operating temperature range in provided specifications. For applications requiring defined temperature performance, use TZM5248B-GS18 (specified to 175°C) or other TLZ variants with complete temperature specifications.

Q: Is package footprint identical between SOD-80 and SOD-123?

A: No. SOD-80 (DO-213AC, MINI-MELF) and SOD-123 are different package formats with different footprints. PCB layout modification is required if substituting CLL4705 TR (SOD-80) with CMHZ4705 TR (SOD-123).

Q: Which substitute part has the highest inventory availability?

A: TZM5248B-GS08 has 50,300 pieces in stock, followed by TLZ18C-GS08 with 2,967 pieces. For immediate availability, these parts are preferred.

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