CLL4705 BK Zener Diode 18V 500mW SOD-80 Equivalent & Substitute Parts

Part Overview

The CLL4705 BK is a surface mount zener diode manufactured by Central Semiconductor Corp, rated for 18 V nominal zener voltage with 500 mW maximum power dissipation in SOD-80 (DO-213AC, MINI-MELF) package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for circuit applications requiring 18 V zener regulation.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	18 V
Tolerance	±5%
Power - Max	500 mW
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

Substitute Part Grouping Explanation

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

Primary Substitution Criteria:

Zener voltage: 18 V nominal
Power rating: 500 mW maximum
Package type: SOD-80 (DO-213AC, MINI-MELF) for mechanical and thermal compatibility
Mounting type: Surface mount

Secondary Compatibility Factors:

Tolerance specification (±5% preferred for direct replacement)
Reverse leakage current characteristics
Forward voltage characteristics
Operating temperature range

Substitute parts are grouped into two categories:

Category 1: Direct Package Equivalents (SOD-80 MiniMELF) Parts maintaining identical SOD-80 package form factor with 18 V / 500 mW ratings from Vishay General Semiconductor (TLZ series) and Central Semiconductor (CMHZ series variants). These provide mechanical interchangeability with the original CLL4705 BK.

Category 2: Alternative Package Form (SOD-123) The CMHZ4705 BK variant uses SOD-123 package, which differs mechanically from SOD-80 but maintains identical electrical specifications. This substitution requires PCB layout modification.

Parameter Comparison

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

Engineering Selection Recommendations

For Direct Mechanical Replacement (SOD-80 Package):

The Vishay General Semiconductor TLZ series (TLZ18-GS08, TLZ18-GS18, TLZ18A-GS08, TLZ18A-GS18, TLZ18B-GS08, TLZ18B-GS18, TLZ18C-GS08) provides active, pin-compatible substitutes in SOD-80 package. All TLZ variants are ROHS3 compliant with REACH unaffected status. These parts maintain the same zener voltage (18 V) and power rating (500 mW) as the CLL4705 BK with operating temperature ranges of -65°C to 175°C.

The TZM5248B series (TZM5248B-GS08, TZM5248B-GS18) offers equivalent electrical performance with ±5% tolerance matching the original specification. Both variants are ROHS3 compliant and REACH unaffected.

For Alternative Package Consideration (SOD-123):

The CMHZ4705 BK from Central Semiconductor Corp maintains identical electrical specifications (18 V, 500 mW, ±5% tolerance) but uses SOD-123 package. This part is active and REACH unaffected. Selection of this variant requires PCB redesign to accommodate the different package footprint. Operating temperature range is -65°C to 150°C, which is lower than the original CLL4705 BK specification.

Compliance Status:

All recommended active substitutes carry ROHS3 compliance and REACH unaffected status, suitable for applications requiring environmental regulatory adherence.

Frequently Asked Questions (FAQ)

Q: Can TLZ18-GS08 and TLZ18-GS18 be used interchangeably with CLL4705 BK?

A: Yes. Both parts share identical zener voltage (18 V), power rating (500 mW), and SOD-80 package form factor. The suffix designations (-GS08 and -GS18) indicate different tape reel configurations for automated assembly but do not affect electrical performance or pin compatibility.

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

A: The TLZ18A and TLZ18B variants differ in reverse leakage current specifications. TLZ18A specifies 40 nA @ 15.4 V, while TLZ18B specifies 40 nA @ 16 V. Both maintain 18 V zener voltage and 500 mW power rating. Selection depends on circuit leakage current requirements.

Q: Why does CMHZ4705 BK have a lower maximum operating temperature than CLL4705 BK?

A: The CMHZ4705 BK uses SOD-123 package, which has different thermal characteristics than SOD-80. The SOD-123 package limits junction temperature to 150°C maximum, compared to 200°C for SOD-80. This is a package-dependent limitation, not an electrical specification change.

Q: Are TZM5248B parts suitable replacements despite different part numbering?

A: Yes. TZM5248B-GS08 and TZM5248B-GS18 are functionally equivalent to CLL4705 BK, sharing 18 V zener voltage, 500 mW power rating, ±5% tolerance, and SOD-80 package. The different part number reflects Vishay's product line designation but does not indicate incompatibility.

Q: What does the -GS08 and -GS18 suffix indicate?

A: The suffix designates tape reel configuration for surface mount assembly. -GS08 indicates 8 mm tape width, while -GS18 indicates 18 mm tape width. Both configurations contain identical components; selection depends on assembly equipment compatibility.

Q: Can CLL4705 BK be replaced with CMHZ4705 BK without PCB modification?

A: No. CMHZ4705 BK uses SOD-123 package while CLL4705 BK uses SOD-80 package. These packages have different footprints and pin spacing, requiring PCB layout redesign for mechanical fit.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed (TLZ series and TZM5248B series from Vishay, CMHZ4705 BK from Central Semiconductor) are ROHS3 compliant and REACH unaffected.

Q: What is the inventory status of substitute parts?

A: Vishay TLZ18C-GS08 has the highest inventory (2967 pcs), followed by TLZ18A-GS08 (2700 pcs) and TZM5248B-GS08 (50300 pcs). All listed substitutes are available as new original stock.

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