CLL4763A BK Zener Diode 91V 1W Equivalent & Substitute Parts

Part Overview

The CLL4763A BK is a surface mount Zener diode rated at 91 V nominal voltage with 1 W maximum power dissipation, 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.

Zener diodes in this voltage and power class are used in voltage regulation, overvoltage protection, and reference circuits. The 91 V rating with ±5% tolerance and 1 W power rating define the functional requirements for direct substitution.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	91	V
Tolerance	±5%	—
Power - Max	1	W
Impedance (Max)	250	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 69.2 V
Voltage - Forward (Max) @ If	1.2	V @ 200 mA
Operating Temperature	-65 to 200	°C
Mounting Type	Surface Mount	—
Package / Case	DO-213AB, MELF	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CLL4763A BK is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 91 V nominal
Power rating: minimum 1 W (higher ratings acceptable)
Tolerance: ±5% or tighter (±10%, ±20% not acceptable for direct substitution)
Package: DO-213AB or MELF equivalent
Mounting: Surface mount

Acceptable Variations:

Operating temperature range may differ; lower minimum temperature acceptable if application does not require -65°C operation
Impedance (Zzt) up to 250 Ohms acceptable; lower values preferred
Reverse leakage current: lower values preferred; higher values acceptable within circuit design margins

Substitute Categories:

Category 1: Direct Electrical Equivalents (91V, 1W, ±5%)

1N4763AUR (Microchip Technology)
CDLL3043B (Microchip Technology)
JANTX1N3043BUR-1 (Microchip Technology, Military Grade)

Category 2: Enhanced Power Rating (91V, 1.25W, ±5%)

1N5948BUR-1 (Microchip Technology)
CDLL5948B (Microchip Technology)
CDLL5948C (Microchip Technology, ±2% tolerance)
CDLL5948D (Microchip Technology, ±1% tolerance)

Category 3: Relaxed Tolerance (91V, 1W, ±10% or ±20%)

CDLL3043 (±20% tolerance)
CDLL3043A (±10% tolerance)

Category 4: Alternative Voltage Tolerance (91V, 1W, ±5%)

1N3043BUR-1 (Microchip Technology, operating temperature -55°C to 175°C)

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Vf (Max)	Temp Range	Package	Status
CLL4763A BK	Central Semiconductor	91 V	±5%	1 W	250 Ω	5 µA @ 69.2V	1.2 V @ 200mA	-65 to 200°C	DO-213AB MELF	Obsolete
1N4763AUR	Microchip Technology	91 V	±5%	1 W	250 Ω	5 µA @ 69.2V	1.2 V @ 200mA	-65 to 175°C	DO-213AB MELF	Active
1N3043BUR-1	Microchip Technology	91 V	±5%	1 W	250 Ω	10 µA @ 69.2V	1.2 V @ 200mA	-55 to 175°C	DO-213AB MELF	Active
1N5948BUR-1	Microchip Technology	91 V	±5%	1.25 W	200 Ω	1 µA @ 69.2V	1.2 V @ 200mA	-65 to 175°C	DO-213AB MELF	Active
CDLL3043	Microchip Technology	91 V	±20%	1 W	250 Ω	500 nA @ 69.2V	1.2 V @ 200mA	-55 to 175°C	DO-213AB MELF	Active
CDLL3043A	Microchip Technology	91 V	±10%	1 W	250 Ω	500 nA @ 69.2V	1.2 V @ 200mA	-55 to 175°C	DO-213AB MELF	Active
CDLL3043B	Microchip Technology	91 V	±5%	1 W	250 Ω	500 nA @ 69.2V	1.2 V @ 200mA	-55 to 175°C	DO-213AB MELF	Active
CDLL5948B	Microchip Technology	91 V	±5%	1.25 W	200 Ω	1 µA @ 69.2V	1.2 V @ 200mA	-65 to 175°C	DO-213AB MELF	Active
CDLL5948C	Microchip Technology	91 V	±2%	1.25 W	200 Ω	1 µA @ 69.2V	1.2 V @ 200mA	-65 to 175°C	DO-213AB MELF	Active
CDLL5948D	Microchip Technology	91 V	±1%	1.25 W	200 Ω	1 µA @ 69.2V	1.2 V @ 200mA	-65 to 175°C	DO-213AB MELF	Active
JANTX1N3043BUR-1	Microchip Technology	91 V	±5%	1 W	250 Ω	10 µA @ 69.2V	1.2 V @ 200mA	-55 to 175°C	DO-213AB MELF	Active

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement:

1N4763AUR (Microchip Technology) is the preferred direct substitute. It maintains identical electrical specifications to the CLL4763A BK including 91 V nominal voltage, ±5% tolerance, 1 W power rating, and 250 Ohm impedance. The part is in active production status with 1130 units in stock. Operating temperature range extends to 175°C (versus 200°C on the original), which is acceptable for most applications not requiring operation above 175°C.

Alternative for Enhanced Performance:

CDLL5948B or CDLL5948C (Microchip Technology) provide increased power rating (1.25 W) and lower impedance (200 Ohms) while maintaining 91 V voltage and ±5% tolerance. These parts are suitable for applications requiring improved thermal margin or lower dynamic impedance. CDLL5948C offers ±2% tolerance for precision voltage regulation applications.

Military Grade Option:

JANTX1N3043BUR-1 (Microchip Technology) is qualified to MIL-PRF-19500/115 and suitable for military or aerospace applications. Electrical specifications match the original part with ±5% tolerance and 1 W power rating.

Cost-Optimized Alternatives:

CDLL3043 (±20% tolerance) or CDLL3043A (±10% tolerance) are available for applications where voltage tolerance requirements are relaxed. These parts feature lower reverse leakage current (500 nA) compared to the original specification.

Temperature Consideration:

If application requires operation below -55°C, 1N4763AUR or CDLL5948B/C are suitable (minimum -65°C). If operation above 175°C is required, verify circuit design compatibility as most active substitutes are rated to 175°C maximum.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher power rating (1.25 W) in place of the 1 W original?

A: Yes. Higher power rating is acceptable and provides additional thermal margin. The 1.25 W parts (1N5948BUR-1, CDLL5948B, CDLL5948C, CDLL5948D) maintain the same 91 V voltage and ±5% tolerance. Verify PCB thermal design accommodates the physical dimensions of the substitute package.

Q: What is the difference between 1N4763AUR and CDLL3043B?

A: Both are 91 V, 1 W, ±5% Zener diodes in DO-213AB MELF package. Key differences: 1N4763AUR has 5 µA reverse leakage current and -65 to 175°C operating range. CDLL3043B has 500 nA reverse leakage current and -55 to 175°C operating range. CDLL3043B is preferred for low-leakage applications.

Q: Can I use CDLL3043 (±20% tolerance) instead of the ±5% original?

A: Only if circuit design tolerates ±20% voltage variation. For precision voltage regulation or reference applications, use ±5% or tighter tolerance parts (1N4763AUR, CDLL3043B, CDLL5948B, CDLL5948C, CDLL5948D).

Q: Is the DO-213AB package identical to MELF?

A: DO-213AB and MELF are equivalent designations for the same surface mount cylindrical package. All substitute parts listed use this package and are mechanically compatible.

Q: What does the "JANTX" prefix on JANTX1N3043BUR-1 indicate?

A: JANTX indicates military-grade qualification to MIL-PRF-19500/115 standard. This part is suitable for military, aerospace, and high-reliability applications requiring formal qualification documentation.

Q: Can I substitute a part with lower impedance (200 Ohms vs. 250 Ohms)?

A: Yes. Lower impedance is acceptable and provides better dynamic response. The 1.25 W parts (1N5948BUR-1, CDLL5948B, CDLL5948C, CDLL5948D) feature 200 Ohm impedance and are suitable for applications requiring improved transient response.

Q: What is the minimum operating temperature requirement for my application?

A: If your circuit operates at -65°C, use 1N4763AUR, 1N5948BUR-1, CDLL5948B, CDLL5948C, or CDLL5948D. If minimum temperature is -55°C or higher, all listed substitutes are acceptable.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are RoHS non-compliant, matching the original CLL4763A BK specification. REACH status is unaffected for all parts.

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