CLL4755A TR Equivalent & Substitute Parts

Part Overview

The CLL4755A TR is a 43 V, 1 W Zener diode manufactured by Central Semiconductor Corp in Surface Mount MELF packaging (DO-213AB). This component is classified as obsolete, with 993 pieces currently in stock. The part operates across a temperature range of -65°C to 200°C and features ±5% voltage tolerance with a maximum impedance of 70 Ohms.

Due to the obsolete product status of the CLL4755A TR, equivalent and substitute parts from active manufacturers are necessary to ensure long-term design continuity, supply chain reliability, and compliance with current industry standards. Substitute components maintain the core electrical specifications while offering improved availability and active product support.

Key Parameters

Parameter	CLL4755A TR	Unit
Voltage - Zener (Nom)	43	V
Tolerance	±5%	—
Power - Max	1	W
Impedance (Max)	70	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 32.7 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature	-65°C ~ 200°C	—
Mounting Type	Surface Mount	—
Package / Case	DO-213AB, MELF	—
Moisture Sensitivity Level	1 (Unlimited)	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution logic for the CLL4755A TR is based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage: 43 V (nominal)
Tolerance: ±5% or tighter
Power rating: 1 W or greater
Package: DO-213AB / MELF Surface Mount
Forward voltage: 1.2 V @ 200 mA
Operating temperature range compatibility

Grouping Strategy:

Group 1: Direct Electrical Equivalents (1 W, ±5% Tolerance) Parts with identical power rating and tolerance specifications. These provide the closest functional match to the original CLL4755A TR.

Group 2: Enhanced Power Rating (1.25 W, ±5% Tolerance or Better) Parts with increased power dissipation capability while maintaining ±5% or tighter voltage tolerance. These offer improved thermal performance and margin.

Group 3: Alternative Tolerance Grades (1 W, Varying Tolerance) Parts with 1 W power rating but different tolerance specifications (±10%, ±20%). These are suitable for applications with relaxed voltage tolerance requirements.

Group 4: Premium Tolerance Variants (1.25 W, ±2% or ±1%) High-precision Zener diodes with enhanced voltage accuracy and increased power rating for demanding applications.

All substitute parts maintain the DO-213AB / MELF package format and Surface Mount mounting type. All substitute parts are manufactured by Microchip Technology and carry Active product status.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Status
CLL4755A TR	Central Semiconductor	43 V	±5%	1 W	70 Ω	5 µA @ 32.7 V	1.2 V @ 200 mA	-65°C ~ 200°C	Obsolete
1N3035BUR-1	Microchip Technology	43 V	±5%	1 W	70 Ω	10 µA @ 32.7 V	1.2 V @ 200 mA	-55°C ~ 175°C	Active
1N5940BUR-1	Microchip Technology	43 V	±5%	1.25 W	53 Ω	1 µA @ 32.7 V	1.2 V @ 200 mA	-65°C ~ 175°C	Active
CDLL3035	Microchip Technology	43 V	±20%	1 W	70 Ω	500 nA @ 32.7 V	1.2 V @ 200 mA	-55°C ~ 175°C	Active
CDLL3035A	Microchip Technology	43 V	±10%	1 W	70 Ω	500 nA @ 32.7 V	1.2 V @ 200 mA	-55°C ~ 175°C	Active
CDLL3035B	Microchip Technology	43 V	±5%	1 W	70 Ω	500 nA @ 32.7 V	1.2 V @ 200 mA	-55°C ~ 175°C	Active
CDLL4755	Microchip Technology	43 V	±10%	Not specified	70 Ω	100 nA @ 32.7 V	1.2 V @ 200 mA	-65°C ~ 175°C	Active
CDLL4755A	Microchip Technology	43 V	±5%	Not specified	70 Ω	100 nA @ 32.7 V	1.2 V @ 200 mA	-65°C ~ 175°C	Active
CDLL5940B	Microchip Technology	43 V	±5%	1.25 W	53 Ω	1 µA @ 32.7 V	1.2 V @ 200 mA	-65°C ~ 175°C	Active
CDLL5940C	Microchip Technology	43 V	±2%	1.25 W	53 Ω	1 µA @ 32.7 V	1.2 V @ 200 mA	-65°C ~ 175°C	Active
CDLL5940D	Microchip Technology	43 V	±1%	1.25 W	53 Ω	1 µA @ 32.7 V	1.2 V @ 200 mA	-65°C ~ 175°C	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

CDLL3035B is the primary direct substitute for CLL4755A TR. Both parts share identical electrical specifications: 43 V nominal Zener voltage, ±5% tolerance, 1 W maximum power, 70 Ohms maximum impedance, and 1.2 V forward voltage at 200 mA. CDLL3035B carries Active product status from Microchip Technology, ensuring long-term availability and supply chain continuity. The operating temperature range of -55°C to 175°C covers most standard industrial applications, though the original part extends to 200°C maximum.

For Enhanced Thermal Performance:

CDLL5940B and 1N5940BUR-1 provide 1.25 W power rating with ±5% tolerance, identical to the original part's voltage specifications. Both parts reduce impedance to 53 Ohms and improve reverse leakage characteristics (1 µA vs. 5 µA). These parts are suitable for applications requiring additional thermal margin or higher power dissipation. CDLL5940B maintains the full -65°C to 175°C temperature range, matching the original part's lower temperature limit.

For Relaxed Tolerance Applications:

CDLL3035A (±10% tolerance) and CDLL3035 (±20% tolerance) are suitable for applications where voltage tolerance requirements are less stringent. Both maintain 1 W power rating and 70 Ohms impedance. These parts offer lower reverse leakage (500 nA) compared to the original specification.

For High-Precision Applications:

CDLL5940C (±2% tolerance) and CDLL5940D (±1% tolerance) provide enhanced voltage accuracy with 1.25 W power rating. These parts are appropriate for precision voltage regulation circuits requiring tighter voltage control.

Compliance Considerations:

All substitute parts are manufactured by Microchip Technology with Active product status. All parts carry REACH Unaffected status and EAR99 ECCN classification, matching the original part's compliance profile. All substitute parts are classified as RoHS non-compliant, consistent with the original CLL4755A TR specification.

Frequently Asked Questions (FAQ)

Q: Can CDLL3035B be used as a direct drop-in replacement for CLL4755A TR?

A: Yes. CDLL3035B matches all critical electrical parameters: 43 V nominal Zener voltage, ±5% tolerance, 1 W power rating, 70 Ohms impedance, and 1.2 V forward voltage at 200 mA. Both parts use DO-213AB / MELF Surface Mount packaging. The operating temperature range differs slightly (-55°C to 175°C vs. -65°C to 200°C), which is acceptable for most applications.

Q: What is the difference between CDLL5940B and CDLL3035B?

A: CDLL5940B provides 1.25 W power rating compared to CDLL3035B's 1 W rating. CDLL5940B also features lower impedance (53 Ohms vs. 70 Ohms) and improved reverse leakage characteristics (1 µA vs. 500 nA). Both maintain ±5% tolerance and 43 V nominal voltage. CDLL5940B is suitable for applications requiring higher power dissipation or improved thermal performance.

Q: Are there tolerance grade options available?

A: Yes. CDLL3035 offers ±20% tolerance, CDLL3035A offers ±10% tolerance, and CDLL3035B offers ±5% tolerance. For enhanced precision, CDLL5940C provides ±2% tolerance and CDLL5940D provides ±1% tolerance. All maintain 43 V nominal voltage and are available in 1 W or 1.25 W power ratings.

Q: Does the package format remain the same across all substitutes?

A: Yes. All substitute parts use DO-213AB / MELF Surface Mount packaging, identical to the original CLL4755A TR. No PCB layout modifications are required for substitution.

Q: What is the significance of the lower reverse leakage in substitute parts?

A: Lower reverse leakage (1 µA to 500 nA in substitutes vs. 5 µA in the original) indicates improved device quality and reduced off-state current. This characteristic is beneficial for precision voltage regulation and low-power applications, though it does not affect basic substitution compatibility.

Q: Can I use a substitute part with different tolerance if my application allows it?

A: Yes, provided your circuit design accommodates the wider tolerance range. For example, CDLL3035A (±10%) or CDLL3035 (±20%) can be used in applications where voltage tolerance requirements are less stringent than ±5%. Verify that your circuit's voltage regulation margin accommodates the specified tolerance range.

Q: What is the temperature range consideration for substitution?

A: The original CLL4755A TR operates from -65°C to 200°C. Most substitute parts operate from -55°C to 175°C. If your application requires operation below -55°C or above 175°C, verify that the substitute part's temperature range is acceptable. CDLL5940B and CDLL5940C maintain the -65°C lower limit, matching the original part.

Q: Are all substitute parts from the same manufacturer?

A: Yes. All substitute parts listed are manufactured by Microchip Technology. The original CLL4755A TR is manufactured by Central Semiconductor Corp. Microchip Technology substitutes carry Active product status, ensuring ongoing availability and support.

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