Equivalent & Substitute Parts for CLL4762A BK Zener Diode

Part Overview

The CLL4762A BK is a surface mount Zener diode rated at 82 V, 1 W, manufactured by Central Semiconductor Corp in the DO-213AB MELF package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 82 V Zener voltage with ±5% tolerance and 1 W power rating define the core electrical specifications for this component category. Substitute parts must maintain the 82 V nominal Zener voltage while accommodating variations in tolerance, power rating, and operating temperature range within acceptable engineering parameters.

Key Parameters

Parameter	CLL4762A BK	Unit
Voltage - Zener (Nom)	82	V
Tolerance	±5%	—
Power - Max	1	W
Impedance (Max)	200	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 62.2 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 CLL4762A BK is based on the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 82 V (exact match required)
Mounting Type: Surface Mount (exact match required)
Package / Case: DO-213AB or MELF (exact match required)
Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Secondary Compatibility Parameters:

Tolerance: ±5% or tighter (±10%, ±2%, ±1% acceptable)
Power - Max: 1 W or greater (1.25 W acceptable)
Impedance (Max): 200 Ohms or lower (160 Ohms acceptable)
Current - Reverse Leakage @ Vr: 5 µA or lower (1 µA, 10 µA, 100 nA acceptable within design margins)
Voltage - Forward (Vf) (Max) @ If: 1.2 V @ 200 mA (exact match)
Operating Temperature: -65°C ~ 200°C or compatible range (-55°C ~ 175°C acceptable with design review)

All substitute parts listed maintain the 82 V Zener voltage specification and DO-213AB MELF package format. Variations in tolerance, power rating, impedance, and reverse leakage current are within acceptable substitution parameters for this diode category.

Parameter Comparison

Parameter	CLL4762A BK	1N4762AUR	1N3042BUR-1	1N5947BUR-1	CDLL4762	CDLL5947B	CDLL5947C	CDLL5947D
Voltage - Zener (Nom)	82 V	82 V	82 V	82 V	82 V	82 V	82 V	82 V
Tolerance	±5%	±5%	±5%	±5%	±10%	±5%	±2%	±1%
Power - Max	1 W	1 W	1 W	1.25 W	—	1.25 W	1.25 W	1.25 W
Impedance (Max)	200 Ohms	200 Ohms	200 Ohms	160 Ohms	200 Ohms	160 Ohms	160 Ohms	160 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 62.2 V	5 µA @ 62.2 V	10 µA @ 62.2 V	1 µA @ 62.2 V	100 nA @ 62.2 V	1 µA @ 62.2 V	1 µA @ 62.2 V	1 µA @ 62.2 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 200 mA
Operating Temperature	-65°C ~ 200°C	-65°C ~ 175°C	-55°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AB, MELF	DO-213AB, MELF	DO-213AB, MELF	DO-213AB, MELF	DO-213AB, MELF	DO-213AB, MELF	DO-213AB, MELF	DO-213AB, MELF
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Manufacturer	Central Semiconductor Corp	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology

Engineering Selection Recommendations

Direct Equivalent (Preferred for Pin-Compatible Replacement):

1N4762AUR is the direct equivalent to CLL4762A BK. Both parts share identical electrical specifications: 82 V Zener voltage, ±5% tolerance, 1 W power rating, 200 Ohms maximum impedance, and 5 µA reverse leakage current. 1N4762AUR is manufactured by Microchip Technology and carries Active product status, ensuring long-term availability and supply chain continuity. The operating temperature range is -65°C ~ 175°C, which is narrower than the original part's -65°C ~ 200°C specification. This difference is acceptable for most applications operating within standard industrial temperature ranges.

Higher Power Alternatives (1.25 W Rating):

1N5947BUR-1, CDLL5947B, CDLL5947C, and CDLL5947D all provide 1.25 W power rating with 82 V Zener voltage. These parts offer improved thermal performance and lower impedance (160 Ohms versus 200 Ohms), resulting in reduced dynamic resistance. All four parts are Active status from Microchip Technology. Selection among these four depends on tolerance requirements:

1N5947BUR-1: ±5% tolerance, 1 µA reverse leakage
CDLL5947B: ±5% tolerance, 1 µA reverse leakage
CDLL5947C: ±2% tolerance, 1 µA reverse leakage
CDLL5947D: ±1% tolerance, 1 µA reverse leakage

Wider Tolerance Alternative:

CDLL4762 maintains the 1 W power rating and 200 Ohms impedance of the original part but specifies ±10% tolerance instead of ±5%. This part features exceptionally low reverse leakage current (100 nA @ 62.2 V). CDLL4762 is suitable for applications where tolerance relaxation is acceptable and leakage minimization is critical.

Temperature Range Consideration:

1N3042BUR-1 operates at -55°C ~ 175°C, which is narrower than the original -65°C ~ 200°C range. This part is suitable only for applications not requiring operation below -55°C or above 175°C.

All substitute parts maintain Moisture Sensitivity Level 1 (Unlimited) and are RoHS non-compliant, consistent with the original part's compliance status.

Frequently Asked Questions (FAQ)

Q: Can I use a 1.25 W Zener diode as a substitute for the 1 W CLL4762A BK?

A: Yes. The 1.25 W parts (1N5947BUR-1, CDLL5947B, CDLL5947C, CDLL5947D) are acceptable substitutes. Higher power rating provides additional thermal margin and does not degrade circuit performance. The 82 V Zener voltage, forward voltage, and package format remain identical. Verify that circuit board thermal design accommodates the substitute part's physical dimensions if different from the original.

Q: What is the difference between 1N4762AUR and 1N5947BUR-1?

A: Both parts maintain 82 V Zener voltage and ±5% tolerance. The primary differences are: 1N4762AUR is rated 1 W with 200 Ohms impedance; 1N5947BUR-1 is rated 1.25 W with 160 Ohms impedance. 1N5947BUR-1 offers lower dynamic resistance and improved power dissipation capability. Both are Active status from Microchip Technology.

Q: Does tolerance variation affect circuit performance?

A: Tolerance affects the Zener voltage accuracy. CDLL4762 (±10% tolerance) allows ±8.2 V deviation from 82 V nominal. CDLL5947C (±2% tolerance) allows ±1.64 V deviation. CDLL5947D (±1% tolerance) allows ±0.82 V deviation. Select tolerance based on circuit voltage regulation requirements. Tighter tolerance parts (±1%, ±2%) are necessary for precision voltage reference applications.

Q: Is the operating temperature range difference between CLL4762A BK (-65°C ~ 200°C) and substitute parts (-65°C ~ 175°C) significant?

A: The difference is significant only if your application requires operation above 175°C. Most industrial and commercial applications operate within -55°C ~ 175°C. Verify your specific application's maximum operating temperature before selecting a substitute. If operation above 175°C is required, consult alternative component sources.

Q: Can I substitute CDLL4762 (±10% tolerance) for the original ±5% tolerance part?

A: CDLL4762 is acceptable only if circuit design tolerates ±10% Zener voltage variation. The wider tolerance results in 73.8 V to 90.2 V operating range versus 77.9 V to 86.1 V for ±5% parts. Verify that downstream circuit components and voltage regulation requirements accommodate this wider range.

Q: Are all substitute parts in the same DO-213AB MELF package?

A: Yes. All substitute parts listed use DO-213AB MELF surface mount package, ensuring mechanical and electrical compatibility with the original CLL4762A BK footprint. No PCB layout modifications are required.

Q: What does "Active" product status mean for substitute parts?

A: Active status indicates the part is currently manufactured and supported by Microchip Technology. Active parts have guaranteed long-term availability, ongoing technical support, and stable pricing. The original CLL4762A BK is Obsolete, meaning it is no longer manufactured and supply is limited to existing inventory.

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