CLL4709 TR Zener Diode 24V 500mW Equivalent & Substitute Parts

Part Overview

The CLL4709 TR 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 that maintain electrical and mechanical compatibility for ongoing production and repair applications. 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	CLL4709 TR
Voltage - Zener (Nom)	24 V
Power - Max	500 mW
Tolerance	±5%
Current - Reverse Leakage @ Vr	10 nA @ 18.2 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 CLL4709 TR is determined by the following critical parameters:

Electrical Equivalence Requirements:

Voltage - Zener (Nom): 24 V
Power - Max: 500 mW
Mounting Type: Surface Mount
Package / Case: SOD-80 (DO-213AC, MINI-MELF)

Tolerance Considerations: Parts with ±5% tolerance directly match the original specification. Parts with ±2% tolerance (TZMB series) provide tighter voltage regulation and are functionally compatible as they fall within the original tolerance band.

Temperature Range: The original part operates to 200°C. Substitute parts operating to 175°C represent a reduced upper temperature limit. Selection depends on application thermal requirements.

Packaging Variants: The CMHZ4709 TR uses SOD-123 package, which differs from the SOD-80 package of the original part and is not mechanically compatible for direct board-level substitution.

Product Status: All identified substitutes are active products, eliminating obsolescence risk for future procurement.

Parameter Comparison

Parameter	CLL4709 TR	CMHZ4709 TR	TLZ24-GS08	TLZ24-GS18	TZMB24-GS08	TZMB24-GS18	TZMC24-GS08	TZMC24-M-08	TZMC24-M-18
Voltage - Zener (Nom)	24 V	24 V	24 V	24 V	24 V	24 V	24 V	24 V	24 V
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW
Tolerance	±5%	±5%	Not specified	Not specified	±2%	±2%	±5%	±5%	±5%
Current - Reverse Leakage @ Vr	10 nA @ 18.2 V	10 nA @ 18.2 V	Not specified	Not specified	100 nA @ 18 V	100 nA @ 18 V	100 nA @ 18 V	100 nA @ 18 V	100 nA @ 18 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 100 mA	1.5 V @ 100 mA	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 200°C	-65°C ~ 150°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
Package / Case	DO-213AC, MINI-MELF, SOD-80	SOD-123	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
Manufacturer	Central Semiconductor Corp	Central Semiconductor Corp	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor
Grade	Not specified	Not specified	Not specified	Not specified	Automotive	Automotive	Automotive	Automotive	Automotive
Qualification	Not specified	Not specified	Not specified	Not specified	AEC-Q101	AEC-Q101	AEC-Q101	AEC-Q101	AEC-Q101
RoHS Status	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Package-Compatible Substitutes (SOD-80):

The following parts maintain identical SOD-80 package compatibility and are suitable for direct board-level replacement:

TZMC24-GS08 and TZMC24-M-08 (Vishay, Automotive Grade, AEC-Q101): These parts provide ±5% tolerance matching the original specification, automotive qualification, and active product status. Operating temperature extends to 175°C, which is 25°C below the original part. Reverse leakage current is 100 nA at 18 V, compared to 10 nA at 18.2 V in the original. These parts are suitable for applications not requiring the full 200°C upper temperature limit.

TZMB24-GS08 and TZMB24-GS18 (Vishay, Automotive Grade, AEC-Q101): These parts provide ±2% tolerance, offering tighter voltage regulation than the original ±5% specification. Automotive qualification and active status support long-term availability. Operating temperature and reverse leakage characteristics match the TZMC series.

TLZ24-GS08 and TLZ24-GS18 (Vishay, Active): These parts maintain SOD-80 package compatibility and 500 mW power rating. Tolerance is not specified in the data provided. Operating temperature extends to 175°C. These parts lack automotive qualification and AEC-Q101 certification.

Non-Compatible Substitute:

CMHZ4709 TR (Central Semiconductor Corp, Active): While electrically equivalent with matching voltage, power, tolerance, and forward voltage characteristics, this part uses SOD-123 package, which is not mechanically compatible with SOD-80 footprints. This part is not suitable for direct board-level substitution without PCB redesign.

Compliance Considerations:

All Vishay substitute parts are ROHS3 compliant and REACH unaffected. The automotive-grade parts (TZMB and TZMC series) carry AEC-Q101 qualification, supporting applications requiring automotive component standards.

Frequently Asked Questions (FAQ)

Q: Can CMHZ4709 TR be used as a direct replacement for CLL4709 TR?

A: No. Although CMHZ4709 TR is electrically equivalent, it uses SOD-123 package while CLL4709 TR uses SOD-80 package. These packages have different footprints and are not mechanically compatible for direct board-level substitution without PCB redesign.

Q: What is the difference between TZMC24-GS08 and TZMB24-GS08?

A: Both parts use SOD-80 package and are automotive-grade with AEC-Q101 qualification. The primary difference is voltage tolerance: TZMC24-GS08 has ±5% tolerance matching the original CLL4709 TR, while TZMB24-GS08 has ±2% tolerance, providing tighter voltage regulation. Both operate to 175°C maximum junction temperature.

Q: Why do substitute parts have a lower maximum operating temperature (175°C vs. 200°C)?

A: The original CLL4709 TR operates to 200°C junction temperature. Most active substitute parts, particularly the Vishay automotive-grade options, are rated to 175°C. Selection depends on application thermal requirements. If the application requires operation above 175°C, alternative parts must be evaluated.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive electronics qualification standard. Parts carrying this qualification have undergone rigorous testing for reliability and performance in automotive applications. TZMB and TZMC series parts are AEC-Q101 qualified, making them suitable for automotive and high-reliability applications.

Q: Are all substitute parts RoHS compliant?

A: All Vishay substitute parts (TLZ, TZMB, and TZMC series) are ROHS3 compliant. The original CLL4709 TR RoHS status is not specified in the provided data. RoHS compliance is important for applications subject to environmental regulations.

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

A: The original CLL4709 TR specifies 10 nA reverse leakage at 18.2 V. Most Vishay substitutes specify 100 nA at 18 V. Higher reverse leakage current may affect circuit performance in applications with stringent leakage requirements. Evaluate application sensitivity to this parameter before selection.

Q: Can TLZ24-GS08 and TLZ24-GS18 be used interchangeably?

A: Yes. Both parts are from the same TLZ series with identical electrical specifications (24 V, 500 mW, SOD-80 package). The difference is packaging configuration (GS08 vs. GS18 reel sizes). Selection depends on procurement and assembly requirements, not electrical performance.

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

A: Both parts are from the Vishay TZMC24 series with identical electrical specifications. The designation difference (M vs. GS) indicates different packaging or reel configurations. Electrical performance and compatibility are equivalent.

Q: Is the CLL4709 TR still available for purchase?

A: The CLL4709 TR is classified as obsolete. While 723 pieces are noted as in stock, long-term availability is not assured. Transition to active substitute parts is recommended for new designs and ongoing production to ensure supply chain continuity.

Q: Which substitute part is the best choice for new designs?

A: For new designs requiring automotive qualification and long-term availability, TZMC24-GS08 or TZMC24-M-08 are recommended. These parts provide ±5% tolerance matching the original specification, automotive-grade qualification (AEC-Q101), active product status, and SOD-80 package compatibility. If tighter voltage tolerance is required, TZMB24-GS08 or TZMB24-GS18 offer ±2% tolerance with the same automotive qualification.

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