CLL5235B BK Zener Diode 6.8V 500mW SOD-80 Equivalent & Substitute Parts

Part Overview

The CLL5235B BK is a surface mount zener diode manufactured by Central Semiconductor Corp, rated at 6.8 V nominal zener voltage with 500 mW maximum power dissipation in SOD-80 (DO-213AC, MINI-MELF) package. This part is classified as obsolete. Due to its obsolete status and limited inventory availability (728 pcs), equivalent substitute parts from active product lines are necessary for ongoing design support and procurement continuity. Vishay General Semiconductor - Diodes Division offers multiple active alternatives within the TLZ6V8 series that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	CLL5235B BK	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 Range	-65°C to 200°C	-
Mounting Type	Surface Mount	-
Package / Case	DO-213AC, MINI-MELF, SOD-80	-
Product Status	Obsolete	-

Substitute Part Grouping Explanation

Substitution of the CLL5235B BK is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage (Vz): 6.8 V nominal
Maximum power rating: 500 mW
Package type: SOD-80 (DO-213AC, MINI-MELF) surface mount
Mounting compatibility: Surface mount technology

Secondary Compatibility Parameters:

Impedance (Zzt): Maximum 8 Ohms (substitute specification) versus 5 Ohms (original)
Reverse leakage current: 2 µA @ 4 V (substitute specification) versus 3 µA @ 5 V (original)
Forward voltage: 1.5 V @ 200 mA (substitute specification) versus 1.25 V @ 200 mA (original)
Operating temperature range: -65°C to 175°C (substitute specification) versus -65°C to 200°C (original)

All five substitute parts from Vishay (TLZ6V8A-GS08, TLZ6V8A-GS18, TLZ6V8B-GS08, TLZ6V8B-GS18, TLZ6V8C-GS08, TLZ6V8C-GS18) maintain the core electrical specifications (6.8 V, 500 mW, SOD-80 package) required for direct substitution. Variations exist only in packaging configuration (Tape & Reel with different reel sizes: GS08 and GS18) and tolerance grades (A, B, C series).

Parameter Comparison

Parameter	CLL5235B BK	TLZ6V8A-GS08	TLZ6V8A-GS18	TLZ6V8B-GS08	TLZ6V8B-GS18	TLZ6V8C-GS08	TLZ6V8C-GS18
Voltage - Zener (Nom)	6.8 V	6.8 V	6.8 V	6.8 V	6.8 V	6.8 V	6.8 V
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	5 Ohms	8 Ohms	8 Ohms	8 Ohms	8 Ohms	8 Ohms	8 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 5 V	2 µA @ 4 V	2 µA @ 4 V	2 µA @ 4 V	2 µA @ 4 V	2 µA @ 4 V	2 µA @ 4 V
Voltage - Forward (Vf) (Max) @ If	1.25 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 to 200°C	-65°C to 175°C	-65°C to 175°C	-65°C to 175°C	-65°C to 175°C	-65°C to 175°C	-65°C to 175°C
Package / Case	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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	Request inventory verification	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Selection Criteria:

All five Vishay TLZ6V8 series substitute parts are active products with ROHS3 compliance and REACH unaffected status, providing superior long-term availability and regulatory compliance compared to the obsolete CLL5235B BK.

Packaging Configuration Selection:

GS08 variants (TLZ6V8A-GS08, TLZ6V8B-GS08, TLZ6V8C-GS08): Tape & Reel packaging with 8mm reel diameter. Recommended for high-volume production environments with automated pick-and-place equipment.
GS18 variants (TLZ6V8A-GS18, TLZ6V8B-GS18, TLZ6V8C-GS18): Tape & Reel packaging with 18mm reel diameter. Suitable for standard manufacturing lines and mixed-volume production scenarios.

Tolerance Grade Selection:

TLZ6V8A series: Standard tolerance grade
TLZ6V8B series: Tighter tolerance grade
TLZ6V8C series: Tighter tolerance grade

Selection between tolerance grades depends on circuit design requirements for zener voltage accuracy. All grades maintain the 6.8 V nominal specification and 500 mW power rating.

Inventory Availability:

TLZ6V8B-GS08 offers the highest inventory level (206,976 pcs), followed by TLZ6V8C-GS08 (137,700 pcs) and TLZ6V8A-GS08 (117,600 pcs), providing optimal procurement flexibility for volume requirements.

Frequently Asked Questions (FAQ)

Q: Can TLZ6V8 series parts directly replace CLL5235B BK in existing designs?

A: Yes. All TLZ6V8 variants maintain identical zener voltage (6.8 V), power rating (500 mW), and SOD-80 package configuration. The parts are pin-compatible and functionally equivalent for circuit applications. Differences in impedance, reverse leakage, and forward voltage are within acceptable engineering tolerances for most applications.

Q: What is the difference between GS08 and GS18 packaging?

A: GS08 and GS18 designations refer to reel diameter sizes in Tape & Reel packaging (8mm and 18mm respectively). Both contain identical diode components. Selection depends on manufacturing equipment compatibility and production volume requirements. GS08 is optimized for high-speed automated assembly; GS18 is standard for conventional production lines.

Q: Are all TLZ6V8 variants ROHS3 compliant?

A: Yes. All five substitute parts (TLZ6V8A-GS08, TLZ6V8A-GS18, TLZ6V8B-GS08, TLZ6V8B-GS18, TLZ6V8C-GS08, TLZ6V8C-GS18) are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.

Q: What is the operating temperature difference between CLL5235B BK and TLZ6V8 substitutes?

A: CLL5235B BK operates from -65°C to 200°C, while TLZ6V8 series operates from -65°C to 175°C. The substitute parts have a 25°C lower maximum operating temperature. Applications requiring operation above 175°C must retain the original CLL5235B BK specification.

Q: How do impedance specifications differ?

A: CLL5235B BK specifies maximum impedance of 5 Ohms, while all TLZ6V8 variants specify 8 Ohms maximum. This 3 Ohm difference affects circuit transient response characteristics. Designs sensitive to impedance performance should evaluate circuit simulation with the higher impedance value.

Q: Which substitute part offers the best inventory availability?

A: TLZ6V8B-GS08 provides the highest stock level at 206,976 pcs, making it the optimal choice for immediate procurement and volume production requirements.

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