CLL4760A TR Equivalent & Substitute Parts

Part Overview

The CLL4760A TR is a 68 V, 1 W Zener diode manufactured by Central Semiconductor Corp in Surface Mount MELF packaging (DO-213AB). This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -65°C to 200°C with ±5% voltage tolerance and is suitable for voltage regulation and protection applications in electronic circuits.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	68 V
Tolerance	±5%
Power - Max	1 W
Impedance (Max) (Zzt)	150 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 51.7 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 (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CLL4760A TR is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 68 V (nominal)
Package type: DO-213AB / MELF (Surface Mount)
Mounting type: Surface Mount
Forward voltage: 1.2 V @ 200 mA
Moisture sensitivity: MSL 1 (Unlimited)

Secondary Compatibility Factors:

Power rating: 1 W or higher
Voltage tolerance: ±5% or tighter
Impedance: 150 Ohms or lower
Operating temperature range: Must encompass application requirements
Reverse leakage current: Application-dependent

Substitute parts are grouped into three categories based on power rating and tolerance specifications:

Category 1: 1 W Power Rating, ±5% Tolerance Direct functional equivalents with identical power and tolerance specifications.

Category 2: 1 W Power Rating, Alternate Tolerances Parts with 1 W power rating but different voltage tolerance values (±10%, ±20%).

Category 3: 1.25 W Power Rating, ±5% or Tighter Tolerance Enhanced power rating with improved or equivalent voltage tolerance, suitable for higher dissipation applications.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Vf @ 200mA (V)	Temp Range (°C)	Product Status
CLL4760A TR	Central Semiconductor Corp	68	±5%	1	150	1.2	-65 ~ 200	Obsolete
1N3040BUR-1	Microchip Technology	68	±5%	1	150	1.2	-55 ~ 175	Active
1N5945BUR-1	Microchip Technology	68	±5%	1.25	120	1.2	-65 ~ 175	Active
CDLL3040	Microchip Technology	68	±20%	1	150	1.2	-55 ~ 175	Active
CDLL3040B	Microchip Technology	68	±5%	1	150	1.2	-55 ~ 175	Active
CDLL4760	Microchip Technology	68	±10%	—	150	1.2	-65 ~ 175	Active
CDLL4760A	Microchip Technology	68	±5%	—	150	1.2	-65 ~ 175	Active
CDLL5945B	Microchip Technology	68	±5%	1.25	120	1.2	-65 ~ 175	Active
CDLL5945C	Microchip Technology	68	±2%	1.25	120	1.2	-65 ~ 175	Active
CDLL5945D	Microchip Technology	68	±1%	1.25	120	1.2	-65 ~ 175	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

CDLL3040B and 1N3040BUR-1 are direct functional equivalents to the CLL4760A TR, matching the 68 V nominal voltage, ±5% tolerance, 1 W power rating, and 150 Ohm impedance. Both are manufactured by Microchip Technology and carry Active product status. CDLL3040B offers higher inventory availability (1171 pcs) compared to 1N3040BUR-1 (697 pcs). The operating temperature range of both parts (-55°C to 175°C) is narrower than the original CLL4760A TR (-65°C to 200°C); applications requiring the full original temperature range must account for this limitation.

Enhanced Power Rating Substitutes:

CDLL5945B, CDLL5945C, and CDLL5945D provide 1.25 W power rating with improved impedance characteristics (120 Ohms versus 150 Ohms). These parts maintain 68 V nominal voltage and are suitable for applications requiring higher power dissipation. CDLL5945C and CDLL5945D offer tighter voltage tolerances (±2% and ±1% respectively) for precision voltage regulation applications. All three parts support the full -65°C to 175°C operating temperature range. 1N5945BUR-1 is an equivalent 1.25 W option from Microchip Technology with comparable specifications.

Tolerance Variants:

CDLL4760 and CDLL4760A provide ±10% and ±5% tolerance options respectively, with extended temperature range support (-65°C to 175°C). CDLL3040 offers a ±20% tolerance variant for applications with relaxed voltage accuracy requirements.

Product Status Consideration:

All recommended substitutes carry Active product status, ensuring long-term availability and supply chain continuity. The original CLL4760A TR is classified as Obsolete; transition to an Active equivalent is necessary for new designs and ongoing production support.

Frequently Asked Questions (FAQ)

Q: Can I use CDLL3040B as a direct replacement for CLL4760A TR?

A: CDLL3040B is functionally equivalent in terms of Zener voltage (68 V), tolerance (±5%), power rating (1 W), impedance (150 Ohms), and forward voltage characteristics. However, the operating temperature range differs: CDLL3040B operates from -55°C to 175°C, while CLL4760A TR operates from -65°C to 200°C. If your application requires operation below -55°C or above 175°C, CDLL3040B is not suitable. For standard industrial temperature ranges, CDLL3040B is a direct substitute.

Q: What is the difference between the 1 W and 1.25 W power rating options?

A: The 1.25 W variants (CDLL5945B, CDLL5945C, CDLL5945D, and 1N5945BUR-1) can dissipate 25% more power than the 1 W options. These parts also feature lower impedance (120 Ohms versus 150 Ohms), resulting in better voltage regulation characteristics. Use 1.25 W variants when circuit power dissipation exceeds 1 W or when improved regulation is required. For applications within 1 W dissipation limits, either rating is acceptable.

Q: Why do some substitute parts not list a power rating?

A: CDLL4760 and CDLL4760A do not specify a power rating in the provided data. These parts are functionally compatible with CLL4760A TR based on voltage, tolerance, impedance, and temperature characteristics. Consult detailed datasheets for complete power dissipation specifications before selection.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use DO-213AB / MELF Surface Mount packaging, identical to the original CLL4760A TR. No PCB layout modifications are required for substitution.

Q: Which substitute offers the best voltage accuracy?

A: CDLL5945D provides the tightest voltage tolerance at ±1%, followed by CDLL5945C at ±2%. These parts are suitable for precision voltage regulation applications requiring high accuracy. Standard applications can use ±5% tolerance variants (CDLL3040B, CDLL5945B, 1N3040BUR-1, 1N5945BUR-1).

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

A: Reverse leakage current affects circuit performance in high-impedance applications. The original CLL4760A TR specifies 5 µA @ 51.7 V. Substitute parts show variations: 1N3040BUR-1 (10 µA), CDLL3040 (500 nA), CDLL3040B (500 nA), CDLL4760 (100 nA), CDLL4760A (100 nA), and CDLL5945 variants (1 µA). Lower leakage is generally preferable for precision circuits; higher leakage is acceptable for standard regulation applications.

Q: Can I use CDLL3040 with ±20% tolerance instead of ±5%?

A: CDLL3040 is electrically compatible but offers only ±20% voltage tolerance compared to the original ±5%. Use CDLL3040 only in applications where ±20% voltage variation is acceptable. For applications requiring ±5% accuracy, select CDLL3040B, CDLL4760A, or CDLL5945B instead.

Q: What is the temperature range limitation for 1N3040BUR-1?

A: 1N3040BUR-1 operates from -55°C to 175°C, which is narrower than the original CLL4760A TR range of -65°C to 200°C. If your application requires operation at temperatures below -55°C or above 175°C, select CDLL4760A, CDLL5945B, CDLL5945C, or CDLL5945D instead, all of which support -65°C to 175°C operation.

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