CLL5235B TR Equivalent & Substitute Parts

Part Overview

The CLL5235B TR is a 6.8 V Zener diode rated at 500 mW in SOD-80 (MINI-MELF) surface mount package, manufactured by Central Semiconductor Corp. This part is classified as obsolete, with 2600 units currently in stock. The CLL5235B TR features ±5% voltage tolerance, 5 Ohms maximum impedance, and operates across the temperature range of -65°C to 200°C.

Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, procurement planning, and long-term product support. Substitute parts must maintain electrical compatibility across voltage regulation, power dissipation, and thermal operating ranges while conforming to the same physical package specifications.

Key Parameters

Parameter	CLL5235B TR	Unit
Voltage - Zener (Nom)	6.8	V
Tolerance	±5%	-
Power - Max	500	mW
Impedance (Max)	5	Ohms
Current - Reverse Leakage @ Vr	3 µA @ 5 V	-
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	-
Operating Temperature	-65°C ~ 200°C	-
Mounting Type	Surface Mount	-
Package / Case	DO-213AC, MINI-MELF, SOD-80	-
Moisture Sensitivity Level	1 (Unlimited)	-
Product Status	Obsolete	-

Substitute Part Grouping Explanation

Substitute parts for the CLL5235B TR are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Zener voltage: 6.8 V nominal
Power rating: 500 mW maximum
Package type: SOD-80 (MINI-MELF, DO-213AC)
Mounting: Surface mount
Moisture sensitivity: MSL 1 (Unlimited)

Secondary Compatibility Parameters:

Impedance (Zzt): Maximum 8 Ohms acceptable (original specifies 5 Ohms maximum)
Reverse leakage current: Up to 2-3 µA @ specified voltage
Forward voltage: Up to 1.5 V @ 200 mA acceptable
Operating temperature: Minimum -65°C to 175°C acceptable

Substitute parts are divided into two functional groups:

Group 1: Standard Tolerance Zener Diodes (TLZ Series) Parts TLZ6V8A-GS08, TLZ6V8A-GS18, TLZ6V8B-GS08, TLZ6V8B-GS18, and TLZ6V8C-GS08/GS18 from Vishay General Semiconductor. These are active production parts with RoHS3 compliance. Impedance is 8 Ohms (higher than original 5 Ohms), and tolerance is not specified in the data provided.

Group 2: ±5% Tolerance Zener Diodes (TZM Series) Parts TZM5235B-GS08, TZM5235B-GS18, TZMC6V8-M-08, and TZMC6V8-M-18 from Vishay General Semiconductor. These maintain the ±5% tolerance specification of the original part. TZM5235B variants are standard industrial grade, while TZMC6V8-M variants carry AEC-Q101 automotive qualification.

All substitute parts maintain the 6.8 V nominal zener voltage, 500 mW power rating, SOD-80 package, and surface mount configuration required for direct replacement.

Parameter Comparison

Parameter	CLL5235B TR	TLZ6V8A-GS08	TLZ6V8B-GS08	TZM5235B-GS08	TZMC6V8-M-08
Voltage - Zener (Nom)	6.8 V	6.8 V	6.8 V	6.8 V	6.8 V
Tolerance	±5%	-	-	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	5 Ohms	8 Ohms	8 Ohms	5 Ohms	8 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 5 V	2 µA @ 4 V	2 µA @ 4 V	3 µA @ 5 V	100 nA @ 3 V
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 200°C	-65°C ~ 175°C	-65°C ~ 175°C	175°C	-65°C ~ 175°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-80	SOD-80	SOD-80	SOD-80	SOD-80
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Qualification	-	-	-	-	AEC-Q101

Engineering Selection Recommendations

For Standard Industrial Applications:

Select TZM5235B-GS08 or TZM5235B-GS18 as primary substitutes. These parts maintain the ±5% tolerance specification of the original CLL5235B TR, ensuring equivalent voltage regulation performance. Both are active production parts with RoHS3 compliance and 180,300 units (GS08) and 891 units (GS18) in stock. The impedance specification matches the original at 5 Ohms maximum, and reverse leakage current is identical at 3 µA @ 5 V. The maximum operating temperature is 175°C, which is lower than the original 200°C specification but acceptable for most industrial applications.

For Applications Requiring Extended Temperature Range:

The CLL5235B TR specifies operation to 200°C. No substitute parts in the provided list maintain this upper temperature limit. Applications requiring the full -65°C to 200°C range should retain the original CLL5235B TR if available from inventory (2600 units in stock).

For Automotive and High-Reliability Applications:

Select TZMC6V8-M-08 or TZMC6V8-M-18. These parts carry AEC-Q101 automotive qualification and are active production components. They maintain ±5% tolerance, 500 mW power rating, and SOD-80 package. The reverse leakage current is significantly lower at 100 nA @ 3 V, indicating superior leakage performance. Operating temperature range is -65°C to 175°C. Both variants are in stock with 794 units (M-08) and 884 units (M-18) available.

For General-Purpose Substitution with Maximum Availability:

Select TLZ6V8B-GS08. This part is active production with 206,976 units in stock, ensuring long-term availability. It maintains the 6.8 V nominal voltage and 500 mW power rating in SOD-80 package. The impedance is 8 Ohms (higher than original 5 Ohms) and reverse leakage is 2 µA @ 4 V. Operating temperature is -65°C to 175°C. RoHS3 compliance is confirmed.

Compliance Considerations:

All recommended substitute parts are RoHS3 compliant and REACH unaffected, meeting modern environmental and regulatory requirements. The original CLL5235B TR does not specify RoHS status. All substitutes carry ECCN EAR99 and HTSUS 8541.10.0050 classifications, matching the original part's regulatory profile.

Frequently Asked Questions (FAQ)

Q: Can TLZ6V8 series parts directly replace CLL5235B TR?

A: TLZ6V8 series parts are electrically compatible for most applications. They maintain the 6.8 V nominal voltage and 500 mW power rating in identical SOD-80 packaging. However, impedance is 8 Ohms versus the original 5 Ohms, and tolerance is not specified in the provided data. For applications sensitive to impedance or requiring ±5% tolerance, TZM5235B series is preferred.

Q: What is the impact of impedance difference (5 Ohms vs. 8 Ohms)?

A: Impedance affects the dynamic response of the zener diode under transient conditions. The original CLL5235B TR specifies 5 Ohms maximum impedance. TLZ6V8 series parts specify 8 Ohms maximum. In voltage regulation circuits with stable load conditions, this difference is typically negligible. In high-frequency or transient-sensitive applications, the higher impedance may result in slightly slower voltage response. TZM5235B series maintains 5 Ohms impedance, matching the original specification.

Q: Is the operating temperature reduction from 200°C to 175°C significant?

A: The CLL5235B TR operates to 200°C maximum, while most substitute parts are rated to 175°C. This 25°C difference is significant only for applications operating near the upper temperature limit. Most industrial and commercial applications operate well below 175°C. If your application requires sustained operation above 175°C, the original CLL5235B TR should be retained from existing inventory.

Q: Which substitute part offers the best leakage performance?

A: TZMC6V8-M-08 and TZMC6V8-M-18 offer the lowest reverse leakage current at 100 nanoamperes @ 3 V, compared to 2-3 microamperes in other substitutes. This superior leakage performance makes automotive-qualified TZMC6V8-M variants ideal for precision voltage reference circuits and low-power applications where leakage current must be minimized.

Q: Are packaging variants (GS08 vs. GS18) interchangeable?

A: GS08 and GS18 designations refer to tape reel packaging configurations (8mm vs. 18mm reel widths). Both variants contain identical die and electrical specifications. They are interchangeable from an electrical standpoint. Selection between GS08 and GS18 depends on assembly equipment compatibility and procurement logistics, not electrical performance.

Q: Can I use TLZ6V8C-GS08 instead of TZM5235B-GS08?

A: TLZ6V8C-GS08 and TZM5235B-GS08 are both active production parts in SOD-80 packages with 6.8 V nominal voltage and 500 mW power rating. The primary difference is tolerance specification: TZM5235B maintains ±5% tolerance matching the original CLL5235B TR, while TLZ6V8C tolerance is not specified. For applications where voltage tolerance is critical, TZM5235B is the preferred choice. For general-purpose applications, TLZ6V8C is acceptable and offers higher inventory availability (137,700 units vs. 180,300 units).

Q: What is the advantage of AEC-Q101 qualified parts?

A: AEC-Q101 qualification indicates the part meets automotive industry reliability and quality standards established by the Automotive Electronics Council. TZMC6V8-M-08 and TZMC6V8-M-18 carry this qualification. For automotive applications or systems requiring automotive-grade reliability, these parts provide documented quality assurance. For non-automotive applications, AEC-Q101 qualification is not required but indicates superior manufacturing controls.

Q: Is RoHS3 compliance mandatory for my application?

A: RoHS3 (Restriction of Hazardous Substances Directive 3) compliance is mandatory for products sold in the European Union and increasingly required by global OEMs. All recommended substitute parts are RoHS3 compliant. The original CLL5235B TR does not specify RoHS status. If your product must meet RoHS3 requirements, substitute parts provide documented compliance.

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