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CLL4734A BK Zener Diode 5.6V 1W Equivalent & Substitute Parts
Part Overview
The CLL4734A BK is a surface mount zener diode manufactured by Central Semiconductor Corp, rated at 5.6 V nominal zener voltage with 1 W maximum power dissipation in MELF (DO-213AB) package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement.
Zener diodes in this voltage and power class are used for voltage regulation, overvoltage protection, and reference applications in electronic circuits. The obsolete status of CLL4734A BK requires engineers to select from active alternatives that maintain electrical and mechanical compatibility.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 5.6 | V |
| Tolerance | ±5% | — |
| Power - Max | 1 | W |
| Impedance (Max) | 5 | Ohms |
| Current - Reverse Leakage @ Vr | 10 | µA @ 2 V |
| Voltage - Forward (Vf) (Max) @ If | 1.2 | V @ 200 mA |
| Operating Temperature Range | -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 CLL4734A BK is determined by the following critical parameters:
Primary Electrical Criteria:
- Zener voltage: 5.6 V nominal
- Power rating: minimum 1 W (equal or higher acceptable)
- Tolerance: ±5% or tighter (±5%, ±2%, ±1% acceptable; ±10% acceptable with design review)
- Impedance: 5 Ohms maximum (lower values acceptable)
- Reverse leakage: 10 µA @ 2 V maximum (lower values acceptable)
- Forward voltage: 1.2 V @ 200 mA maximum
Mechanical Criteria:
- Package: DO-213AB or MELF (equivalent surface mount packages)
- Mounting type: Surface Mount
- Moisture sensitivity: MSL 1 (Unlimited)
Compliance Criteria:
- REACH Status: REACH Unaffected
- ECCN: EAR99
- HTSUS: 8541.10.0050
Substitute parts are grouped into two categories:
Category A - Direct Equivalents (1 W power rating, ±5% tolerance): Parts maintaining identical electrical specifications to the original component.
Category B - Enhanced Substitutes (1.25 W power rating or improved tolerance): Parts with higher power ratings or tighter tolerance specifications, providing improved performance margins while maintaining full electrical compatibility.
Parameter Comparison
| Part Number | Manufacturer | Vz (Nom) | Tolerance | Power (Max) | Zzt (Max) | Vr Leakage | Vf (Max) | Temp Range | Package | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| CLL4734A BK | Central Semiconductor | 5.6 V | ±5% | 1 W | 5 Ω | 10 µA @ 2V | 1.2 V @ 200mA | -65 to 200°C | DO-213AB, MELF | Obsolete |
| 1N4734AUR | Microchip Technology | 5.6 V | ±5% | 1 W | 5 Ω | 10 µA @ 2V | 1.2 V @ 200mA | -65 to 175°C | DO-213AB, MELF | Active |
| 1N4734UR-1 | Microsemi Corporation | 5.6 V | ±10% | 1 W | 5 Ω | 10 µA @ 2V | 1.2 V @ 200mA | -65 to 175°C | DO-213AB, MELF | Active |
| 1N5919BUR-1 | Microchip Technology | 5.6 V | ±5% | 1.25 W | 2 Ω | 5 µA @ 3V | 1.2 V @ 200mA | -65 to 175°C | DO-213AB, MELF | Active |
| CDLL3827 | Microchip Technology | 5.6 V | ±10% | 1 W | 5 Ω | 3 µA @ 1V | 1.2 V @ 200mA | -65 to 175°C | DO-213AB, MELF | Active |
| CDLL3827A | Microchip Technology | 5.6 V | ±5% | 1 W | 5 Ω | 3 µA @ 1V | 1.2 V @ 200mA | -65 to 175°C | DO-213AB, MELF | Active |
| CDLL4734 | Microchip Technology | 5.6 V | ±10% | Not specified | 5 Ω | 5 µA @ 2V | 1.2 V @ 200mA | -65 to 175°C | DO-213AB, MELF | Active |
| CDLL4734A | Microchip Technology | 5.6 V | ±5% | Not specified | 5 Ω | 5 µA @ 2V | 1.2 V @ 200mA | -65 to 175°C | DO-213AB, MELF | Active |
| CDLL5919B | Microchip Technology | 5.6 V | ±5% | 1.25 W | 2 Ω | 5 µA @ 3V | 1.2 V @ 200mA | -65 to 175°C | DO-213AB, MELF | Active |
| CDLL5919C | Microchip Technology | 5.6 V | ±2% | 1.25 W | 2 Ω | 5 µA @ 3V | 1.2 V @ 200mA | -65 to 175°C | DO-213AB, MELF | Active |
| CDLL5919D | Microchip Technology | 5.6 V | ±1% | 1.25 W | 2 Ω | 5 µA @ 3V | 1.2 V @ 200mA | -65 to 175°C | DO-213AB, MELF | Active |
Engineering Selection Recommendations
Primary Recommendation - Direct Equivalent:
1N4734AUR (Microchip Technology) is the preferred direct substitute. This part maintains identical electrical specifications to CLL4734A BK (5.6 V, ±5%, 1 W, 5 Ω impedance) with active product status. The operating temperature range is reduced from -65 to 200°C to -65 to 175°C; this reduction is acceptable for most industrial and commercial applications. This part is suitable for direct replacement in existing designs without circuit modification.
Secondary Recommendations - Enhanced Performance:
1N5919BUR-1 (Microchip Technology), CDLL5919B, CDLL5919C, and CDLL5919D provide enhanced specifications with 1.25 W power rating and 2 Ω impedance (versus 1 W and 5 Ω). These parts are suitable for applications requiring improved thermal margin or lower dynamic impedance. CDLL5919C and CDLL5919D offer tighter tolerance specifications (±2% and ±1% respectively) for precision voltage reference applications.
Alternative Equivalents:
CDLL3827A (Microchip Technology) provides equivalent 1 W power rating with ±5% tolerance and improved reverse leakage characteristics (3 µA @ 1 V versus 10 µA @ 2 V). This part is suitable where lower leakage current is beneficial.
CDLL4734A (Microchip Technology) provides ±5% tolerance matching the original specification. Power rating is not specified in available data; verification with manufacturer is required before selection.
1N4734UR-1 (Microsemi Corporation) is an active equivalent with ±10% tolerance. This part is suitable for applications where ±10% tolerance is acceptable, providing an alternative source from a different manufacturer.
CDLL4734 (Microchip Technology) provides ±10% tolerance. Power rating is not specified; verification with manufacturer is required.
CDLL3827 (Microchip Technology) provides ±10% tolerance with improved reverse leakage. Power rating is not specified; verification with manufacturer is required.
All recommended substitutes maintain DO-213AB/MELF surface mount packaging, MSL 1 moisture sensitivity, REACH Unaffected status, and EAR99 ECCN classification consistent with the original part.
Frequently Asked Questions (FAQ)
Q: Can I use 1N4734UR-1 as a direct replacement for CLL4734A BK?
A: Yes. 1N4734UR-1 maintains the same 5.6 V zener voltage, 1 W power rating, and DO-213AB package. The tolerance is ±10% versus ±5% on the original; this is acceptable for most voltage regulation and protection applications. Operating temperature range is -65 to 175°C versus -65 to 200°C; verify your application does not require operation above 175°C.
Q: What is the difference between 1N4734AUR and 1N4734UR-1?
A: Both parts have 5.6 V zener voltage and 1 W power rating in DO-213AB package. 1N4734AUR (Microchip) has ±5% tolerance; 1N4734UR-1 (Microsemi) has ±10% tolerance. 1N4734AUR is preferred for applications requiring tighter voltage tolerance.
Q: Can I use CDLL5919B instead of CLL4734A BK?
A: Yes. CDLL5919B provides the same 5.6 V zener voltage and ±5% tolerance with enhanced 1.25 W power rating and 2 Ω impedance. This part is suitable for direct replacement and provides improved thermal performance. The DO-213AB package is identical.
Q: What is the advantage of CDLL5919C or CDLL5919D over CDLL5919B?
A: CDLL5919C offers ±2% tolerance; CDLL5919D offers ±1% tolerance. Both maintain 1.25 W power rating and 2 Ω impedance. These parts are suitable for precision voltage reference applications requiring tighter zener voltage tolerance than the original ±5% specification.
Q: Are all substitute parts RoHS compliant?
A: All substitute parts listed have RoHS non-compliant status. This matches the original CLL4734A BK. Verify RoHS compliance requirements for your application and supply chain.
Q: Can I use parts with ±10% tolerance in my design?
A: Parts with ±10% tolerance (1N4734UR-1, CDLL3827, CDLL4734) are suitable if your circuit design accommodates ±10% variation in zener voltage. If your design requires ±5% or tighter tolerance, select parts with ±5%, ±2%, or ±1% specifications.
Q: What is the difference between CDLL3827 and CDLL3827A?
A: Both parts have 1 W power rating and DO-213AB package. CDLL3827 has ±10% tolerance; CDLL3827A has ±5% tolerance. Both offer improved reverse leakage (3 µA @ 1 V) compared to the original specification (10 µA @ 2 V).
Q: Is the operating temperature range reduction from -65 to 200°C to -65 to 175°C significant?
A: For most industrial and commercial applications operating below 175°C, this reduction is not significant. Verify your application's maximum operating temperature requirement. If operation above 175°C is required, confirm with the original design whether this temperature range was actually utilized.
Q: Can I mix different substitute parts in the same design?
A: Yes, provided all parts meet the electrical requirements of your circuit. However, for consistency and traceability, use a single part number across a design. If multiple part numbers are necessary, document the substitution rationale and verify electrical equivalence.
Q: What does "Power - Max: Not specified" mean for CDLL4734 and CDLL4734A?
A: The power rating is not provided in the available technical data. Contact the manufacturer (Microchip Technology) to confirm the power rating before selecting these parts. Do not assume equivalence to the 1 W rating without manufacturer confirmation.
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