CLL4688 TR Equivalent & Substitute Parts

Part Overview

The CLL4688 TR is a Zener diode rated at 4.7 V, 500 mW, manufactured by Central Semiconductor Corp in SOD-80 (MINI-MELF) surface mount package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain electrical equivalence across voltage regulation, power dissipation, and thermal operating characteristics while accommodating package and tolerance variations.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.7	V
Tolerance	±5%	-
Power - Max	500	mW
Current - Reverse Leakage @ Vr	10	µA @ 3 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 100 mA
Operating Temperature	-65 to 200	°C
Mounting Type	Surface Mount	-
Package / Case	SOD-80, MINI-MELF, DO-213AC	-

Substitute Part Grouping Explanation

Substitute parts for the CLL4688 TR are selected based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Core Electrical Parameters:

Zener voltage: 4.7 V nominal
Power rating: 500 mW maximum
Package type: SOD-80 (MINI-MELF, DO-213AC)
Mounting: Surface mount

Tolerance and Performance Considerations:

Voltage tolerance: ±5% or tighter (±2%)
Forward voltage: 1.5 V or lower @ specified current
Reverse leakage: 10 µA or lower @ specified voltage
Operating temperature range: minimum -65°C to 175°C or higher

Compliance and Status:

Product status: Active (preferred for ongoing availability)
RoHS compliance: ROHS3 Compliant
Automotive qualification: AEC-Q101 (where applicable)

Substitute parts are grouped into two categories: direct SOD-80 package equivalents from Vishay General Semiconductor and alternative package options from Central Semiconductor Corp. All listed substitutes maintain the 4.7 V zener voltage and 500 mW power rating as mandatory requirements.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Vf Max (V)	Package	Status	Temp Range (°C)
CLL4688 TR	Central Semiconductor	4.7	±5%	500	1.5 @ 100 mA	SOD-80	Obsolete	-65 to 200
CMHZ4688 TR	Central Semiconductor	4.7	±5%	500	1.5 @ 100 mA	SOD-123	Active	-65 to 150
TLZ4V7-GS08	Vishay	4.7	-	500	1.5 @ 200 mA	SOD-80	Active	-65 to 175
TLZ4V7-GS18	Vishay	4.7	-	500	1.5 @ 200 mA	SOD-80	Active	-65 to 175
TLZ4V7A-GS08	Vishay	4.7	-	500	1.5 @ 200 mA	SOD-80	Active	-65 to 175
TLZ4V7A-GS18	Vishay	4.7	-	500	1.5 @ 200 mA	SOD-80	Active	-65 to 175
TZM5230B-GS08	Vishay	4.7	±5%	500	1.1 @ 200 mA	SOD-80	Active	-65 to 175
TZM5230B-GS18	Vishay	4.7	±5%	500	1.1 @ 200 mA	SOD-80	Active	-65 to 175
TZMB4V7-GS08	Vishay	4.7	±2%	500	1.5 @ 200 mA	SOD-80	Active	-65 to 175
TZMB4V7-GS18	Vishay	4.7	±2%	500	1.5 @ 200 mA	SOD-80	Active	-65 to 175
TZMC4V7-GS08	Vishay	4.7	±5%	500	1.5 @ 200 mA	SOD-80	Active	-65 to 175

Engineering Selection Recommendations

Primary Substitute (Same Package):

The TZMC4V7-GS08 from Vishay General Semiconductor is the primary substitute for the CLL4688 TR. Both components are packaged in SOD-80 (MINI-MELF) format with identical zener voltage (4.7 V) and power rating (500 mW). The TZMC4V7-GS08 is active in production, ROHS3 compliant, and AEC-Q101 automotive qualified. This part provides direct mechanical and electrical compatibility with the obsolete CLL4688 TR.

Alternative SOD-80 Substitutes:

The TLZ4V7-GS08, TLZ4V7-GS18, TLZ4V7A-GS08, and TLZ4V7A-GS18 from Vishay are active alternatives in SOD-80 packaging. These parts maintain the 4.7 V zener voltage and 500 mW power rating. The TLZ series variants offer ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). The TZM5230B-GS08 and TZM5230B-GS18 provide improved forward voltage characteristics (1.1 V vs. 1.5 V) while maintaining all other electrical parameters.

Package Variant:

The CMHZ4688 TR from Central Semiconductor is an active equivalent with identical electrical specifications but uses SOD-123 packaging instead of SOD-80. This part is suitable only for designs where SOD-123 package footprint is acceptable. Operating temperature range is reduced to -65°C to 150°C compared to the original -65°C to 200°C specification.

Automotive-Grade Option:

The TZMB4V7-GS08 and TZMB4V7-GS18 are automotive-qualified (AEC-Q101) variants with tighter voltage tolerance (±2%) and lower reverse leakage (500 nA @ 1 V). These parts are suitable for applications requiring automotive-grade reliability and compliance.

Frequently Asked Questions (FAQ)

Q: Can the TZMC4V7-GS08 directly replace the CLL4688 TR without PCB modification?

A: Yes. Both components use identical SOD-80 (MINI-MELF, DO-213AC) packaging and surface mount technology. Electrical parameters (4.7 V zener voltage, 500 mW power rating) are equivalent. No PCB layout changes are required.

Q: What is the difference between TLZ4V7-GS08 and TZMC4V7-GS08?

A: Both are 4.7 V, 500 mW zener diodes in SOD-80 packaging from Vishay. The TLZ series does not specify voltage tolerance, while TZMC4V7-GS08 specifies ±5% tolerance. TZMC4V7-GS08 carries AEC-Q101 automotive qualification; TLZ series does not. TZMC4V7-GS08 has higher impedance (80 Ohms vs. 25 Ohms) and lower reverse leakage (500 nA vs. unspecified).

Q: Is the CMHZ4688 TR a suitable replacement if my design uses SOD-123 footprint?

A: The CMHZ4688 TR is electrically equivalent (4.7 V, 500 mW, ±5% tolerance) but uses SOD-123 packaging. It is suitable only if your PCB footprint accommodates SOD-123. The operating temperature range is limited to -65°C to 150°C, which may not meet applications requiring the original -65°C to 200°C range.

Q: Why do some substitute parts have unspecified voltage tolerance?

A: The TLZ series parts do not specify voltage tolerance in the provided data. When tolerance is not specified, design verification against application requirements is necessary. For applications requiring guaranteed tolerance, select parts with explicit tolerance specifications (±5% or ±2%).

Q: What is the advantage of TZMB4V7 automotive-grade parts?

A: TZMB4V7-GS08 and TZMB4V7-GS18 are AEC-Q101 qualified with ±2% voltage tolerance (tighter than ±5%) and significantly lower reverse leakage (500 nA @ 1 V vs. 10 µA @ 3 V). These characteristics are required for automotive and high-reliability applications.

Q: Can I use TZM5230B-GS08 if forward voltage is critical to my circuit?

A: The TZM5230B-GS08 has lower forward voltage (1.1 V @ 200 mA) compared to the CLL4688 TR (1.5 V @ 100 mA). If forward voltage drop is a design constraint, verify that the lower Vf value does not affect circuit performance. For applications sensitive to forward voltage, select parts with matching Vf specifications.

Q: Are all substitute parts ROHS3 compliant?

A: All Vishay substitute parts listed (TLZ, TZM, TZMB series) are ROHS3 compliant. The CMHZ4688 TR from Central Semiconductor does not specify ROHS status in the provided data. Verify ROHS compliance with the supplier if required for your application.

Q: What packaging options are available for the 4.7 V, 500 mW zener diode?

A: SOD-80 (MINI-MELF, DO-213AC) is the primary package for direct CLL4688 TR replacement. SOD-123 packaging is available via CMHZ4688 TR but requires PCB footprint compatibility. All other substitutes maintain SOD-80 packaging.

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