Equivalent & Substitute Parts for CLL4735A TR Zener Diode

Part Overview

The CLL4735A TR is a 6.2 V, 1 W surface mount zener diode manufactured by Central Semiconductor Corp in MELF (DO-213AB) package. This component is classified as obsolete, which necessitates identification of active substitute parts from current manufacturers to maintain design continuity and ensure long-term supply chain reliability. The electrical characteristics and mechanical compatibility of substitute parts must align with the original specification to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	CLL4735A TR	Unit
Voltage - Zener (Nom)	6.2	V
Tolerance	±5%	—
Power - Max	1	W
Impedance (Max)	2	Ohms
Current - Reverse Leakage @ Vr	10 µA @ 3 V	—
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	—
Operating Temperature Range	-65°C to 200°C	—
Mounting Type	Surface Mount	—
Package / Case	DO-213AB, MELF	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the CLL4735A TR are selected based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Zener voltage: 6.2 V nominal
Package type: DO-213AB / MELF surface mount
Mounting type: Surface mount
Moisture sensitivity: MSL 1 (Unlimited)

Secondary Compatibility Factors:

Tolerance: ±5% or tighter (±5%, ±2%, ±1%)
Power rating: Equal to or greater than 1 W
Impedance: 2 Ohms or lower
Forward voltage: 1.2 V or lower @ 200 mA
Operating temperature: Minimum -65°C to 175°C or higher

Substitute parts are grouped into three categories based on power dissipation capability:

Category 1 - Equal Power (1 W): CDLL3828A maintains identical 1 W power rating with ±5% tolerance and active product status.

Category 2 - Enhanced Power (1.25 W): 1N5920BUR-1, CDLL5920B, CDLL5920C, and CDLL5920D provide increased power handling with improved thermal performance while maintaining 6.2 V specification.

Category 3 - Maximum Power (1.5 W): CDLL4460 offers highest power dissipation for applications requiring enhanced thermal margin.

Category 4 - Reduced Power (500 mW): CDLL6319 provides lower power option for current-limited applications.

Category 5 - Tolerance Variants: CDLL4735 and CDLL4735A offer tolerance options (±10% and ±5% respectively) without specified power rating.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Vf @ 200mA (V)	Temp Range (°C)	Status
CLL4735A TR	Central Semiconductor	6.2	±5%	1	2	1.2	-65 to 200	Obsolete
1N5920BUR-1	Microchip Technology	6.2	±5%	1.25	2	1.2	-65 to 175	Active
CDLL3828A	Microchip Technology	6.2	±5%	1	2	1.2	-65 to 175	Active
CDLL4460	Microchip Technology	6.2	±5%	1.5	4	1	-65 to 175	Active
CDLL4735	Microchip Technology	6.2	±10%	—	2	1.2	-65 to 175	Active
CDLL4735A	Microchip Technology	6.2	±5%	—	2	1.2	-65 to 175	Active
CDLL5920B	Microchip Technology	6.2	±5%	1.25	2	1.2	-65 to 175	Active
CDLL5920C	Microchip Technology	6.2	±2%	1.25	2	1.2	-65 to 175	Active
CDLL5920D	Microchip Technology	6.2	±1%	1.25	2	1.2	-65 to 175	Active
CDLL6319	Microchip Technology	6.2	±5%	0.5	3	1.1	-65 to 175	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement: CDLL3828A is the optimal substitute for CLL4735A TR. This part maintains identical electrical specifications (6.2 V, 1 W, ±5% tolerance, 2 Ohms impedance) and mechanical compatibility (DO-213AB MELF package). The part is in active production status with 907 units in stock, ensuring supply continuity. Operating temperature range of -65°C to 175°C covers the majority of industrial applications, with the original part's extended upper limit of 200°C applicable only in specialized high-temperature designs.

Secondary Recommendations - Enhanced Performance: 1N5920BUR-1, CDLL5920B, CDLL5920C, and CDLL5920D provide increased power dissipation (1.25 W) while maintaining 6.2 V specification and ±5% or tighter tolerance. These parts are suitable for applications where thermal margin improvement is beneficial without circuit redesign.

Precision Applications: CDLL5920D offers ±1% tolerance for applications requiring tighter voltage regulation. CDLL5920C provides ±2% tolerance as an intermediate precision option.

High Power Applications: CDLL4460 delivers 1.5 W power rating for designs requiring maximum thermal headroom. Note that impedance increases to 4 Ohms, which may affect transient response characteristics.

All substitute parts share the following compliance attributes with the original:

REACH Unaffected status
ECCN EAR99 classification
HTSUS 8541.10.0050 tariff code
MSL 1 (Unlimited) moisture sensitivity

Frequently Asked Questions (FAQ)

Q1: Can CDLL3828A directly replace CLL4735A TR without circuit modification?

A: Yes. CDLL3828A maintains identical zener voltage (6.2 V), power rating (1 W), tolerance (±5%), impedance (2 Ohms), and package type (DO-213AB MELF). All electrical and mechanical parameters are equivalent. No circuit redesign is required.

Q2: What is the difference between CDLL5920B, CDLL5920C, and CDLL5920D?

A: These three parts are identical except for tolerance specification. CDLL5920B has ±5% tolerance, CDLL5920C has ±2% tolerance, and CDLL5920D has ±1% tolerance. All three provide 1.25 W power rating compared to the original 1 W. Select based on voltage regulation precision requirements.

Q3: Why does CDLL4460 have 4 Ohms impedance instead of 2 Ohms?

A: CDLL4460 is rated for 1.5 W power dissipation, which is higher than the original 1 W specification. The increased impedance is a characteristic of this higher-power variant. Verify that the circuit design accommodates this impedance change, particularly for transient response and noise filtering applications.

Q4: Is CDLL6319 suitable as a substitute?

A: CDLL6319 is not recommended as a direct substitute. While it maintains 6.2 V zener voltage and ±5% tolerance, the 500 mW power rating is 50% lower than the original 1 W specification. Use only if the application circuit is designed for reduced power dissipation.

Q5: What is the impact of the operating temperature range difference?

A: The original CLL4735A TR operates from -65°C to 200°C. All Microchip substitute parts operate from -65°C to 175°C. For applications requiring operation above 175°C, the original part specification must be maintained. For standard industrial applications (-40°C to 85°C ambient), this difference is not significant.

Q6: Are all substitute parts RoHS compliant?

A: All substitute parts from Microchip Technology are marked as RoHS non-compliant. If RoHS compliance is required for your application, verify with your procurement department or contact the manufacturer for RoHS-compliant alternatives.

Q7: Can I use CDLL4735 or CDLL4735A as substitutes?

A: CDLL4735A is functionally equivalent to CLL4735A TR (same 6.2 V, ±5% tolerance, 2 Ohms impedance). However, power rating is not specified for this variant. CDLL4735 has ±10% tolerance, which is looser than the original ±5% specification and may not be suitable for precision voltage regulation applications. Use CDLL3828A or CDLL4735A for best compatibility.

Q8: What packaging format do all these parts use?

A: All substitute parts use DO-213AB MELF surface mount package, identical to the original CLL4735A TR. No PCB layout modifications are required for mechanical compatibility.

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