Request Quote
(Ships tomorrow)
CLL4732A TR Zener Diode Equivalent & Substitute Parts
Part Overview
The CLL4732A TR is a 4.7 V, 1 W surface mount zener diode manufactured by Central Semiconductor Corp in MELF (DO-213AB) package format. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. 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) | 4.7 | V |
| Tolerance | ±5% | - |
| Power - Max | 1 | W |
| Impedance (Max) | 8 | Ohms |
| Current - Reverse Leakage @ Vr | 10 | µA @ 1 V |
| Voltage - Forward (Vf) (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 CLL4732A TR is determined by strict alignment of the following critical parameters:
Primary Substitution Criteria:
- Zener voltage: 4.7 V nominal
- Mounting type: Surface Mount
- Package format: DO-213AB or MELF equivalent
- Moisture sensitivity: MSL 1 (Unlimited)
Secondary Compatibility Parameters:
- Power rating: 1 W or higher
- Voltage tolerance: ±5% or tighter
- Impedance: 8 Ohms or lower
- Reverse leakage current: 10 µA @ 1 V or lower
- Forward voltage: 1.2 V @ 200 mA or lower
- Operating temperature range: Must support -65°C to 175°C minimum
Substitute parts are grouped into three categories based on power rating and tolerance specifications:
Category 1: Direct 1 W Equivalents (±5% Tolerance) Parts with identical 1 W power rating and ±5% tolerance match the original specification exactly.
Category 2: Enhanced 1.25 W Variants (±5% to ±1% Tolerance) Parts with increased power dissipation capability (1.25 W) provide superior thermal performance while maintaining voltage regulation characteristics. Tolerance ranges from ±5% to ±1%.
Category 3: Reduced Power 500 mW Variant (±5% Tolerance) Part with lower power rating suitable for applications with reduced thermal requirements.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vz (V) | Tolerance | Power (W) | Zzt (Ohms) | Reverse Leakage (µA) | Vf (V) | Temp Range (°C) | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| CLL4732A TR | Central Semiconductor Corp | 4.7 | ±5% | 1 | 8 | 10 @ 1 V | 1.2 @ 200 mA | -65 to 200 | Obsolete |
| 1N4732AUR | Microchip Technology | 4.7 | ±5% | 1 | 8 | 10 @ 1 V | 1.2 @ 200 mA | -65 to 175 | Active |
| CDLL3825A | Microchip Technology | 4.7 | ±5% | 1 | 8 | 5 @ 1 V | 1.2 @ 200 mA | -65 to 175 | Active |
| CDLL4732A | Microchip Technology | 4.7 | ±5% | 1 | 8 | 10 @ 1 V | 1.2 @ 200 mA | -65 to 175 | Active |
| 1N5917BUR-1 | Microchip Technology | 4.7 | ±5% | 1.25 | 5 | 5 @ 1.5 V | 1.2 @ 200 mA | -65 to 175 | Active |
| CDLL5917B | Microchip Technology | 4.7 | ±5% | 1.25 | 5 | 5 @ 1.5 V | 1.2 @ 200 mA | -65 to 175 | Active |
| CDLL5917C | Microchip Technology | 4.7 | ±2% | 1.25 | 5 | 5 @ 1.5 V | 1.2 @ 200 mA | -65 to 175 | Active |
| CDLL5917D | Microchip Technology | 4.7 | ±1% | 1.25 | 5 | 5 @ 1.5 V | 1.2 @ 200 mA | -65 to 175 | Active |
| CDLL3825 | Microchip Technology | 4.7 | ±10% | 1 | 8 | 5 @ 1 V | 1.2 @ 200 mA | -65 to 175 | Active |
| CDLL4732 | Microchip Technology | 4.7 | ±10% | 1 | 8 | 10 @ 1 V | 1.2 @ 200 mA | -65 to 175 | Active |
| CDLL6316 | Microchip Technology | 4.7 | ±5% | 0.5 | 16 | 5 @ 1.5 V | 1.1 @ 200 mA | -65 to 175 | Active |
Engineering Selection Recommendations
Primary Recommendation: CDLL4732A
The CDLL4732A manufactured by Microchip Technology is the optimal direct substitute for the obsolete CLL4732A TR. This part maintains identical electrical specifications: 4.7 V nominal zener voltage, ±5% tolerance, 1 W power rating, 8 Ohms maximum impedance, and equivalent forward voltage characteristics. The part is in active production status, ensuring long-term availability and supply chain stability. Operating temperature range extends to -175°C minimum, meeting the original specification requirement. Moisture sensitivity level remains MSL 1 (Unlimited), confirming compatibility with standard handling and storage protocols.
Secondary Recommendation: 1N4732AUR
The 1N4732AUR from Microchip Technology provides an alternative direct equivalent with identical electrical parameters. This part is actively produced and maintains full compatibility with the original CLL4732A TR specification across all critical parameters.
Enhanced Performance Alternative: CDLL5917D
For applications requiring superior voltage regulation accuracy, the CDLL5917D offers ±1% tolerance with increased power dissipation (1.25 W) and reduced impedance (5 Ohms). This part is suitable for designs where tighter voltage tolerance and improved thermal performance provide system benefits. The enhanced specifications do not compromise backward compatibility in standard applications.
Lower Power Alternative: CDLL6316
The CDLL6316 is specified for applications with reduced power dissipation requirements (500 mW). This part maintains the 4.7 V zener voltage and ±5% tolerance but features higher impedance (16 Ohms). Selection of this part is appropriate only when thermal constraints or circuit design specifically limit power dissipation to 500 mW or below.
Tolerance Variants: CDLL3825 and CDLL4732
Parts with ±10% tolerance (CDLL3825 and CDLL4732) are available for applications where voltage regulation tolerance of ±10% is acceptable. These parts are not recommended as primary substitutes when the original ±5% specification is required.
Frequently Asked Questions (FAQ)
Q: Can I use CDLL5917D as a direct replacement for CLL4732A TR?
A: Yes. The CDLL5917D is electrically compatible. It maintains the 4.7 V zener voltage and ±5% tolerance minimum requirement. The increased power rating (1.25 W versus 1 W) and reduced impedance (5 Ohms versus 8 Ohms) provide enhanced performance without compromising circuit function. The ±1% tolerance offers superior voltage regulation accuracy compared to the original ±5% specification.
Q: What is the difference between 1N4732AUR and CDLL4732A?
A: Both parts are manufactured by Microchip Technology and share identical electrical specifications: 4.7 V, ±5% tolerance, 1 W power rating, and 8 Ohms impedance. The primary difference is the part numbering convention and internal manufacturing process. Both are active production parts suitable for direct substitution of the obsolete CLL4732A TR.
Q: Why does the operating temperature range differ between the original part and substitutes?
A: The original CLL4732A TR specifies -65°C to 200°C operating range. Active substitute parts from Microchip Technology specify -65°C to 175°C. This difference reflects current manufacturing standards and thermal design practices. For applications requiring operation above 175°C, the original specification cannot be met by available active substitutes, and alternative component selection is necessary.
Q: Is CDLL6316 suitable for my application?
A: The CDLL6316 is suitable only if your circuit design operates at 500 mW power dissipation or below. This part features higher impedance (16 Ohms) compared to the original 8 Ohms specification. If your application requires the full 1 W power rating or lower impedance characteristics, select CDLL4732A, 1N4732AUR, or CDLL3825A instead.
Q: What does MSL 1 (Unlimited) moisture sensitivity mean?
A: MSL 1 (Unlimited) indicates the component has no moisture sensitivity restrictions. The part can be stored and handled under standard conditions without special moisture control measures. This classification applies to all listed substitute parts and the original component.
Q: Can I substitute a ±10% tolerance part for the original ±5% specification?
A: Substitution of ±10% tolerance parts (CDLL3825 or CDLL4732) is not recommended when the original ±5% tolerance specification is required. Use these parts only when circuit design permits the wider tolerance range. For applications requiring ±5% accuracy, select CDLL4732A, 1N4732AUR, CDLL3825A, or the enhanced CDLL5917 series.
Q: Are all substitute parts in the same DO-213AB MELF package?
A: Yes. All listed substitute parts are packaged in DO-213AB MELF format, ensuring mechanical and electrical compatibility with the original CLL4732A TR. No package conversion or PCB redesign is required for substitution.
Q: What is the inventory status of substitute parts?
A: All recommended substitute parts are in active production with confirmed inventory availability ranging from 728 to 1106 pieces in stock. The original CLL4732A TR has 772 pieces available but is classified as obsolete, making active substitutes the preferred choice for new designs and ongoing procurement.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts