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CLL4735A BK Zener Diode 6.2V 1W MELF Equivalent & Substitute Parts
Part Overview
The CLL4735A BK is a 6.2 V 1 W surface mount Zener diode manufactured by Central Semiconductor Corp in DO-213AB MELF package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. 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.
Substiute Parts
Key Parameters
| Parameter | Value | 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 | -65°C ~ 200°C | — |
| Mounting Type | Surface Mount | — |
| Package / Case | DO-213AB, MELF | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the CLL4735A BK is determined by the following critical parameters:
Primary Substitution 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 Parameters:
- Power rating: Equal to or greater than 1 W
- Voltage tolerance: ±5% or tighter
- Impedance: 2 Ohms or lower
- Forward voltage: 1.2 V or lower @ 200 mA
- Operating temperature range: Must encompass -65°C to 200°C or be compatible with application requirements
All substitute parts listed are manufactured by Microchip Technology and maintain the same 6.2 V zener voltage specification. Substitutes are grouped by power rating and tolerance specifications, which determine their suitability for specific circuit applications.
Parameter Comparison
| Part Number | Manufacturer | Vz (Nom) | Tolerance | Power (Max) | Zzt (Max) | Vf (Max) @ If | Temp Range | Status |
|---|---|---|---|---|---|---|---|---|
| CLL4735A BK | Central Semiconductor | 6.2 V | ±5% | 1 W | 2 Ω | 1.2 V @ 200 mA | -65°C ~ 200°C | Obsolete |
| 1N5920BUR-1 | Microchip Technology | 6.2 V | ±5% | 1.25 W | 2 Ω | 1.2 V @ 200 mA | -65°C ~ 175°C | Active |
| CDLL3828 | Microchip Technology | 6.2 V | ±10% | 1 W | 2 Ω | 1.2 V @ 200 mA | -65°C ~ 175°C | Active |
| CDLL3828A | Microchip Technology | 6.2 V | ±5% | 1 W | 2 Ω | 1.2 V @ 200 mA | -65°C ~ 175°C | Active |
| CDLL4460 | Microchip Technology | 6.2 V | ±5% | 1.5 W | 4 Ω | 1 V @ 200 mA | -65°C ~ 175°C | Active |
| CDLL4735 | Microchip Technology | 6.2 V | ±10% | — | 2 Ω | 1.2 V @ 200 mA | -65°C ~ 175°C | Active |
| CDLL4735A | Microchip Technology | 6.2 V | ±5% | — | 2 Ω | 1.2 V @ 200 mA | -65°C ~ 175°C | Active |
| CDLL5920B | Microchip Technology | 6.2 V | ±5% | 1.25 W | 2 Ω | 1.2 V @ 200 mA | -65°C ~ 175°C | Active |
| CDLL5920C | Microchip Technology | 6.2 V | ±2% | 1.25 W | 2 Ω | 1.2 V @ 200 mA | -65°C ~ 175°C | Active |
| CDLL5920D | Microchip Technology | 6.2 V | ±1% | 1.25 W | 2 Ω | 1.2 V @ 200 mA | -65°C ~ 175°C | Active |
| CDLL6319 | Microchip Technology | 6.2 V | ±5% | 500 mW | 3 Ω | 1.1 V @ 200 mA | -65°C ~ 175°C | Active |
Engineering Selection Recommendations
Direct Replacement (Highest Compatibility):
CDLL3828A is the primary direct replacement for CLL4735A BK. Both parts share identical electrical specifications: 6.2 V nominal zener voltage, ±5% tolerance, 1 W maximum power, 2 Ohms maximum impedance, and 1.2 V forward voltage at 200 mA. CDLL3828A is manufactured by Microchip Technology and maintains active product status, ensuring long-term availability and supply chain stability.
Higher Power Alternatives:
1N5920BUR-1, CDLL5920B, CDLL5920C, and CDLL5920D provide 1.25 W power ratings, exceeding the original 1 W specification. These parts are suitable for applications requiring additional thermal margin or higher power dissipation capacity. CDLL5920D offers the tightest tolerance at ±1%, while CDLL5920C provides ±2% tolerance for precision applications.
Enhanced Power Rating:
CDLL4460 delivers 1.5 W maximum power with ±5% tolerance. This part features 4 Ohms maximum impedance and 1 V forward voltage at 200 mA. The higher impedance specification may affect circuit performance in precision voltage regulation applications.
Lower Power Alternative:
CDLL6319 provides 500 mW power rating with ±5% tolerance. This part is suitable only for applications with reduced power dissipation requirements and should not be used as a direct replacement in circuits designed for 1 W operation.
Temperature Range Consideration:
The original CLL4735A BK operates to 200°C maximum. All Microchip substitute parts operate to 175°C maximum. Applications requiring operation above 175°C require design review and alternative component selection.
Compliance Status:
All substitute parts are RoHS non-compliant. Applications requiring RoHS compliance require alternative component sourcing.
Frequently Asked Questions (FAQ)
Q: Can CDLL3828A directly replace CLL4735A BK?
A: Yes. CDLL3828A is a direct replacement. Both parts share 6.2 V nominal zener voltage, ±5% tolerance, 1 W power rating, 2 Ohms impedance, and identical forward voltage specifications. Package type is DO-213AB MELF for both parts.
Q: What is the difference between CDLL3828 and CDLL3828A?
A: CDLL3828 has ±10% voltage tolerance, while CDLL3828A has ±5% tolerance. Both share identical power, impedance, and forward voltage specifications. CDLL3828A provides tighter voltage regulation for precision applications.
Q: Can I use CDLL5920D instead of CLL4735A BK?
A: CDLL5920D is electrically compatible with higher power margin. It provides 1.25 W power (versus 1 W), ±1% tolerance (versus ±5%), and identical impedance and forward voltage. The part is suitable for applications where tighter voltage tolerance and additional power capacity are beneficial. Operating temperature range is 175°C maximum versus 200°C for the original part.
Q: Why is CDLL6319 not recommended as a direct replacement?
A: CDLL6319 provides only 500 mW power rating, which is 50% of the original 1 W specification. This part is suitable only for low-power applications and will overheat in circuits designed for 1 W operation.
Q: What is the impact of CDLL4460's higher impedance specification?
A: CDLL4460 has 4 Ohms maximum impedance versus 2 Ohms for the original part. Higher impedance increases dynamic resistance and may affect voltage regulation accuracy in precision circuits. This part is suitable for general-purpose voltage regulation where impedance tolerance is not critical.
Q: Are all substitute parts available in the same package?
A: Yes. All substitute parts use DO-213AB MELF surface mount package, identical to the original CLL4735A BK. No PCB layout modifications are required.
Q: What is the temperature range limitation for substitute parts?
A: All Microchip substitute parts operate to -65°C to 175°C maximum. The original CLL4735A BK operates to 200°C. Applications requiring operation above 175°C require alternative component selection or design modification.
Q: Are substitute parts RoHS compliant?
A: No. All listed substitute parts are RoHS non-compliant. Applications requiring RoHS compliance require alternative sourcing.
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