CLL4709 BK Zener Diode 24V 500mW SOD-80 Equivalent & Substitute Parts

Part Overview

The CLL4709 BK is a 24 V, 500 mW Zener diode manufactured by Central Semiconductor Corp in SOD-80 (DO-213AC, MINI-MELF) surface mount package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and production continuity. The part operates across a temperature range of -65°C to 200°C with ±5% voltage tolerance and 10 nA reverse leakage current at 18.2 V.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	24	V
Power - Maximum	500	mW
Tolerance	±5%	-
Current - Reverse Leakage @ Vr	10	nA @ 18.2 V
Voltage - Forward (Max) @ If	1.5	V @ 100 mA
Operating Temperature Range	-65 to 200	°C (TJ)
Mounting Type	Surface Mount	-
Package / Case	DO-213AC, MINI-MELF, SOD-80	-

Substitute Part Grouping Explanation

Substitution of the CLL4709 BK is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 24 V nominal
Maximum power dissipation: 500 mW
Package type: SOD-80 (DO-213AC, MINI-MELF) surface mount
Voltage tolerance: ±5% or tighter
Reverse leakage current: 10 nA or lower at specified voltage
Forward voltage: 1.5 V maximum at 100 mA or higher current rating
Operating temperature range: Minimum -65°C to 150°C or higher

Substitution Logic:

Parts are grouped into two categories based on package compatibility and electrical performance:

Category 1: SOD-80 Package Direct Substitutes – Parts maintaining the identical SOD-80 (MINI-MELF) package footprint with matching or superior electrical specifications. These include Vishay TLZ and TZM series devices.

Category 2: Alternative Package Substitute – The CMHZ4709 BK uses SOD-123 package, which differs in physical dimensions and PCB footprint, requiring layout modification but offering active product status.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (mW)	Tolerance	Package	Temp Range (°C)	Status	Compliance
CLL4709 BK	Central Semiconductor	24	500	±5%	SOD-80	-65 to 200	Obsolete	EAR99
CMHZ4709 BK	Central Semiconductor	24	500	±5%	SOD-123	-65 to 150	Active	EAR99
TLZ24-GS08	Vishay General Semiconductor	24	500	-	SOD-80	-65 to 175	Active	ROHS3, EAR99
TLZ24-GS18	Vishay General Semiconductor	24	500	-	SOD-80	-65 to 175	Active	ROHS3, EAR99
TZMB24-GS08	Vishay General Semiconductor	24	500	±2%	SOD-80	-65 to 175	Active	ROHS3, AEC-Q101, EAR99
TZMB24-GS18	Vishay General Semiconductor	24	500	±2%	SOD-80	-65 to 175	Active	ROHS3, AEC-Q101, EAR99
TZMC24-GS08	Vishay General Semiconductor	24	500	±5%	SOD-80	-65 to 175	Active	ROHS3, AEC-Q101, EAR99
TZMC24-M-08	Vishay General Semiconductor	24	500	±5%	SOD-80	-65 to 175	Active	ROHS3, AEC-Q101, EAR99
TZMC24-M-18	Vishay General Semiconductor	24	500	±5%	SOD-80	-65 to 175	Active	ROHS3, AEC-Q101, EAR99

Engineering Selection Recommendations

Primary Recommendation: Vishay TZMC24 Series (TZMC24-GS08, TZMC24-M-08, TZMC24-M-18)

The TZMC24 series provides direct SOD-80 package compatibility with the CLL4709 BK. These parts maintain ±5% voltage tolerance matching the original specification and offer active product status with RoHS3 compliance and AEC-Q101 automotive qualification. Operating temperature range extends to -65°C to 175°C, covering the lower end of the original specification. High inventory availability (19,770 units for TZMC24-GS08) ensures supply continuity.

Secondary Recommendation: Vishay TZMB24 Series (TZMB24-GS08, TZMB24-GS18)

The TZMB24 series offers improved voltage tolerance (±2%) with identical SOD-80 package compatibility. AEC-Q101 automotive qualification and RoHS3 compliance are included. Operating temperature range of -65°C to 175°C is suitable for most applications. These parts are appropriate for designs requiring tighter voltage tolerance specifications.

Alternative Recommendation: Vishay TLZ24 Series (TLZ24-GS08, TLZ24-GS18)

The TLZ24 series maintains SOD-80 package compatibility and active product status with RoHS3 compliance. Operating temperature range of -65°C to 175°C is supported. These parts lack automotive qualification but provide a cost-effective alternative for non-automotive applications.

Package Alternative: Central Semiconductor CMHZ4709 BK

The CMHZ4709 BK maintains manufacturer continuity and identical electrical specifications (24 V, 500 mW, ±5% tolerance) but uses SOD-123 package. This substitution requires PCB layout modification and is suitable only when package footprint change is acceptable. Operating temperature range is -65°C to 150°C, which is lower than the original specification.

Frequently Asked Questions (FAQ)

Q: Can TZMC24-GS08 directly replace CLL4709 BK without PCB modification?

A: Yes. Both parts use SOD-80 (DO-213AC, MINI-MELF) package with identical footprint and pinout. No PCB layout changes are required. Electrical specifications are compatible: 24 V nominal, 500 mW power rating, ±5% tolerance, and surface mount configuration.

Q: What is the difference between TZMC24-GS08, TZMC24-M-08, and TZMC24-M-18?

A: All three parts share identical electrical specifications (24 V, 500 mW, ±5% tolerance, SOD-80 package, -65°C to 175°C operating range, AEC-Q101 qualification). The designations indicate different tape and reel packaging configurations (GS08, M-08, M-18) for manufacturing and supply chain purposes. Selection depends on procurement and assembly requirements.

Q: Why does TZMB24 have ±2% tolerance while TZMC24 has ±5%?

A: TZMB24 and TZMC24 represent different product grades within the Vishay TZM series. TZMB24 offers tighter voltage tolerance (±2%) for applications requiring higher precision. Both maintain identical 24 V nominal voltage, 500 mW power rating, SOD-80 package, and AEC-Q101 qualification. Selection depends on circuit tolerance requirements.

Q: Is CMHZ4709 BK a suitable substitute if PCB redesign is possible?

A: CMHZ4709 BK provides electrical equivalence (24 V, 500 mW, ±5% tolerance) and maintains Central Semiconductor manufacturer continuity with active product status. However, SOD-123 package differs from SOD-80, requiring PCB footprint modification. Operating temperature range is -65°C to 150°C, which is lower than the original -65°C to 200°C specification. This substitution is suitable only when layout modification is acceptable and the reduced upper temperature limit does not affect application requirements.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive electronics qualification standard. Parts bearing this qualification (TZMB24 and TZMC24 series) have undergone rigorous testing for automotive applications, including temperature cycling, vibration, and reliability assessments. This qualification is relevant for automotive and high-reliability applications but is not required for general industrial or consumer applications.

Q: Can I use TLZ24 series in automotive applications?

A: TLZ24 series parts lack AEC-Q101 automotive qualification. While electrically compatible with CLL4709 BK in terms of voltage, power rating, and package, they are not qualified for automotive use. For automotive applications, TZMB24 or TZMC24 series are appropriate selections.

Q: What is the significance of operating temperature range differences?

A: The original CLL4709 BK operates from -65°C to 200°C. Substitute parts from Vishay (TLZ24, TZMB24, TZMC24) operate from -65°C to 175°C. This 25°C reduction in maximum operating temperature is acceptable for most applications but must be verified against circuit thermal requirements. If the application requires operation above 175°C, the CLL4709 BK specification cannot be fully matched by available substitutes.

Q: Are all substitute parts RoHS compliant?

A: Vishay parts (TLZ24, TZMB24, TZMC24 series) are RoHS3 compliant. Central Semiconductor CMHZ4709 BK does not specify RoHS status in the provided data. Verify RoHS compliance requirements for your specific application and procurement standards.

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