CLL4762A TR Equivalent & Substitute Parts

Part Overview

The CLL4762A TR is a Zener diode rated at 82 V, 1 W with ±5% tolerance, manufactured by Central Semiconductor Corp in MELF surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across a temperature range of -65°C to 200°C and is suitable for voltage regulation and protection applications in surface mount designs.

Key Parameters

Parameter	Value	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 (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 CLL4762A TR is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 82 V nominal
Tolerance: ±5% (exact match required for precision applications)
Power rating: 1 W minimum
Impedance: 200 Ohms maximum
Reverse leakage: 5 µA maximum @ 62.2 V
Forward voltage: 1.2 V maximum @ 200 mA
Package: DO-213AB or MELF surface mount
Operating temperature range: -65°C minimum to 175°C minimum

Substitution Groups:

Group 1: Direct Electrical Equivalents (1 W, ±5% tolerance) Parts meeting all primary criteria with identical electrical specifications and 1 W power rating: 1N4762AUR, CDLL3042B

Group 2: Enhanced Performance Substitutes (1.25 W, ±5% tolerance) Parts with identical electrical specifications but higher power rating (1.25 W) and improved impedance characteristics: 1N5947BUR-1, CDLL5947B

Group 3: Precision Substitutes (1.25 W, ±2% tolerance) Parts with tighter tolerance specification and higher power rating: CDLL5947C

Group 4: Relaxed Tolerance Substitutes (1 W, ±20% tolerance) Parts with identical power rating but wider tolerance specification: CDLL3042

Group 5: Broader Tolerance Substitutes (±10% tolerance) Parts with intermediate tolerance specification: CDLL4762

Group 6: Higher Power Substitutes (3 W, SMB package) Part with significantly higher power rating and different package form factor: 1SMB5947BT3G

Group 7: Legacy Equivalents (1 W, ±5% tolerance) Part with different reverse leakage specification: 1N3042BUR-1

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Ir @ 62.2V (µA)	Vf @ 200mA (V)	Temp Range (°C)	Package	Status
CLL4762A TR	Central Semiconductor	82	±5%	1	200	5	1.2	-65 to 200	MELF	Obsolete
1N4762AUR	Microchip Technology	82	±5%	1	200	5	1.2	-65 to 175	DO-213AB	Active
1N3042BUR-1	Microchip Technology	82	±5%	1	200	10	1.2	-55 to 175	DO-213AB	Active
1N5947BUR-1	Microchip Technology	82	±5%	1.25	160	1	1.2	-65 to 175	DO-213AB	Active
1SMB5947BT3G	onsemi	82	±5%	3	160	1	1.5	-65 to 150	SMB	Active
CDLL3042	Microchip Technology	82	±20%	1	200	0.5	1.2	-55 to 175	DO-213AB	Active
CDLL3042B	Microchip Technology	82	±5%	1	200	0.5	1.2	-55 to 175	DO-213AB	Active
CDLL4762	Microchip Technology	82	±10%	1	200	0.1	1.2	-65 to 175	DO-213AB	Active
CDLL4762A	Microchip Technology	82	±5%	1	200	0.1	1.2	-65 to 175	DO-213AB	Active
CDLL5947B	Microchip Technology	82	±5%	1.25	160	1	1.2	-65 to 175	DO-213AB	Active
CDLL5947C	Microchip Technology	82	±2%	1.25	160	1	1.2	-65 to 175	DO-213AB	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select 1N4762AUR or CDLL3042B when exact electrical equivalence is required. Both parts maintain 82 V nominal, ±5% tolerance, 1 W power rating, and 200 Ohms impedance. CDLL3042B offers superior reverse leakage performance (0.5 µA vs. 5 µA). Both are active products with unlimited moisture sensitivity rating.

For Enhanced Reliability: Select 1N5947BUR-1 or CDLL5947B when higher power dissipation margin is beneficial. These 1.25 W parts provide 25% additional power headroom while maintaining ±5% tolerance and identical forward voltage characteristics. CDLL5947B extends temperature range to -65°C and offers lower reverse leakage (1 µA).

For Precision Applications: Select CDLL5947C when tighter voltage tolerance is required. This part provides ±2% tolerance with 1.25 W power rating and -65°C to 175°C operating range.

For Cost-Optimized Designs: Select CDLL3042 when tolerance relaxation to ±20% is acceptable. This part maintains 1 W power rating and identical impedance while offering superior reverse leakage performance (0.5 nA).

For Higher Power Requirements: Select 1SMB5947BT3G when power dissipation exceeds 1 W. This 3 W SMB package part is ROHS3 compliant and suitable for applications requiring significantly higher power handling. Note: Different package form factor (SMB vs. MELF) requires PCB layout modification.

Temperature Range Considerations: The original CLL4762A TR operates to 200°C. Most active substitutes operate to 175°C maximum. For applications requiring 200°C operation, verify thermal requirements against actual circuit conditions, as 175°C upper limit may be sufficient for most industrial applications.

Frequently Asked Questions (FAQ)

Q: Can 1N4762AUR directly replace CLL4762A TR without circuit modification? A: Yes. 1N4762AUR is electrically equivalent with identical 82 V nominal, ±5% tolerance, 1 W power rating, and 200 Ohms impedance. Both use DO-213AB/MELF surface mount package. The only difference is operating temperature maximum (175°C vs. 200°C). Verify your application does not require sustained operation above 175°C.

Q: What is the advantage of selecting 1N5947BUR-1 over 1N4762AUR? A: 1N5947BUR-1 provides 1.25 W power rating (25% higher than 1 W), lower impedance (160 Ohms vs. 200 Ohms), and significantly lower reverse leakage (1 µA vs. 5 µA). These characteristics improve circuit stability and reduce standby current. Electrical specifications remain identical at 82 V nominal with ±5% tolerance.

Q: Is CDLL3042B suitable for applications requiring 5 µA reverse leakage specification? A: No. CDLL3042B specifies 0.5 µA reverse leakage, which is lower than the original 5 µA specification. While this represents improved performance, applications with specific leakage current requirements should verify compatibility with lower leakage values.

Q: Can I use 1SMB5947BT3G as a drop-in replacement? A: No. 1SMB5947BT3G uses SMB package (DO-214AA) instead of MELF (DO-213AB). PCB footprint modification is required. Additionally, forward voltage is 1.5 V (vs. 1.2 V) and operating temperature maximum is 150°C. Use only when PCB redesign is feasible and thermal requirements permit 150°C maximum.

Q: What tolerance specification should I select for my design? A: Select ±5% tolerance (CLL4762A TR equivalent) for standard voltage regulation applications. Select ±2% tolerance (CDLL5947C) for precision voltage reference circuits. Select ±20% tolerance (CDLL3042) only when application circuit design accommodates wider voltage variation.

Q: Are all substitute parts RoHS compliant? A: 1SMB5947BT3G is ROHS3 compliant. All other substitute parts are RoHS non-compliant. Verify RoHS compliance requirements for your application and supply chain.

Q: What is the difference between CDLL4762 and CDLL4762A? A: Both parts are 82 V, 1 W, DO-213AB package. CDLL4762 specifies ±10% tolerance with 100 nA reverse leakage. CDLL4762A specifies ±5% tolerance with 100 nA reverse leakage. Select CDLL4762A for tighter voltage tolerance matching the original CLL4762A TR specification.

Q: Can I substitute parts with different reverse leakage specifications? A: Yes, if circuit design permits. Lower reverse leakage (0.5 µA or 1 µA) reduces standby current and improves circuit performance. Higher reverse leakage (10 µA) may be acceptable in applications with higher bias current. Verify actual circuit requirements before selection.

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