CLL4734A TR Equivalent & Substitute Parts

Part Overview

The CLL4734A TR is a surface mount Zener diode rated at 5.6 V nominal with 1 W maximum power dissipation, manufactured by Central Semiconductor Corp in the DO-213AB MELF 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 with ±5% voltage tolerance and is suitable for voltage regulation and protection applications in surface mount designs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	5.6	V
Tolerance	±5%	—
Power - Maximum	1	W
Impedance (Maximum)	5	Ohms
Current - Reverse Leakage @ Vr	10 µA @ 2 V	—
Voltage - Forward (Maximum) @ 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

Substitution of the CLL4734A TR is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 5.6 V nominal
Package type: DO-213AB or MELF surface mount
Mounting type: Surface mount
Moisture sensitivity: MSL 1 (Unlimited)

Secondary Compatibility Factors:

Power rating: Minimum 1 W (higher ratings acceptable for derating applications)
Voltage tolerance: ±5% or tighter (±10% acceptable with circuit margin verification)
Impedance: 5 Ohms maximum (lower impedance acceptable)
Reverse leakage: 10 µA @ 2 V or lower
Forward voltage: 1.2 V @ 200 mA maximum
Operating temperature: Minimum -65°C to 175°C (original part extends to 200°C)

Substitute parts are grouped into three categories based on power rating and tolerance specifications:

Group 1 - Direct Equivalents (1 W, ±5% tolerance): 1N4734AUR, 1N4734UR-1 (with ±10% tolerance), CDLL3827A, CDLL4734A

Group 2 - Enhanced Performance (1.25 W, ±5% or tighter tolerance): 1N5919BUR-1, CDLL5919B, CDLL5919C (±2%), CDLL5919D (±1%)

Group 3 - Relaxed Tolerance (1 W, ±10% tolerance): CDLL3827, CDLL4734

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	Status
CLL4734A TR	Central Semiconductor	5.6 V	±5%	1 W	5 Ω	10 µA @ 2 V	1.2 V @ 200 mA	-65°C to 200°C	DO-213AB MELF	Obsolete
1N4734AUR	Microchip Technology	5.6 V	±5%	1 W	5 Ω	10 µA @ 2 V	1.2 V @ 200 mA	-65°C to 175°C	DO-213AB MELF	Active
1N4734UR-1	Microsemi Corporation	5.6 V	±10%	1 W	5 Ω	10 µA @ 2 V	1.2 V @ 200 mA	-65°C to 175°C	DO-213AB MELF	Active
1N5919BUR-1	Microchip Technology	5.6 V	±5%	1.25 W	2 Ω	5 µA @ 3 V	1.2 V @ 200 mA	-65°C to 175°C	DO-213AB MELF	Active
CDLL3827	Microchip Technology	5.6 V	±10%	1 W	5 Ω	3 µA @ 1 V	1.2 V @ 200 mA	-65°C to 175°C	DO-213AB MELF	Active
CDLL3827A	Microchip Technology	5.6 V	±5%	1 W	5 Ω	3 µA @ 1 V	1.2 V @ 200 mA	-65°C to 175°C	DO-213AB MELF	Active
CDLL4734	Microchip Technology	5.6 V	±10%	Not specified	5 Ω	5 µA @ 2 V	1.2 V @ 200 mA	-65°C to 175°C	DO-213AB MELF	Active
CDLL4734A	Microchip Technology	5.6 V	±5%	Not specified	5 Ω	5 µA @ 2 V	1.2 V @ 200 mA	-65°C to 175°C	DO-213AB MELF	Active
CDLL5919B	Microchip Technology	5.6 V	±5%	1.25 W	2 Ω	5 µA @ 3 V	1.2 V @ 200 mA	-65°C to 175°C	DO-213AB MELF	Active
CDLL5919C	Microchip Technology	5.6 V	±2%	1.25 W	2 Ω	5 µA @ 3 V	1.2 V @ 200 mA	-65°C to 175°C	DO-213AB MELF	Active
CDLL5919D	Microchip Technology	5.6 V	±1%	1.25 W	2 Ω	5 µA @ 3 V	1.2 V @ 200 mA	-65°C to 175°C	DO-213AB MELF	Active

Engineering Selection Recommendations

Primary Selection (Closest Match): 1N4734AUR from Microchip Technology is the primary recommended substitute. It maintains identical electrical specifications (5.6 V, ±5%, 1 W) and package format (DO-213AB MELF) with active product status. The only difference is the reduced upper operating temperature limit (175°C vs. 200°C), which is acceptable for most applications operating below 175°C.

Secondary Selection (Enhanced Performance): 1N5919BUR-1, CDLL5919B, CDLL5919C, and CDLL5919D are suitable when higher power dissipation capability or tighter voltage tolerance is required. These parts offer 1.25 W power rating and lower impedance (2 Ω vs. 5 Ω), providing improved thermal performance and voltage regulation characteristics. CDLL5919D offers the tightest tolerance (±1%) for precision voltage reference applications.

Tertiary Selection (Cost Optimization): CDLL3827A and CDLL4734A provide direct electrical equivalence with ±5% tolerance and 1 W power rating. CDLL3827 and CDLL4734 are available with ±10% tolerance for applications with greater circuit margin.

Temperature Consideration: Applications requiring operation above 175°C must retain the original CLL4734A TR or verify circuit functionality with the reduced upper temperature limit of substitute parts.

Compliance Status: All substitute parts are RoHS non-compliant, matching the original part's compliance profile. All parts carry REACH Unaffected status and EAR99 ECCN classification.

Frequently Asked Questions (FAQ)

Q: Can I use 1N4734UR-1 as a direct replacement for CLL4734A TR? A: Yes. The 1N4734UR-1 is electrically compatible with identical 5.6 V nominal voltage, 1 W power rating, and DO-213AB MELF package. The ±10% tolerance is wider than the original ±5%, but the part is functionally equivalent. Operating temperature range is reduced to 175°C maximum.

Q: What is the difference between the 1 W and 1.25 W Zener diodes? A: The 1.25 W parts (1N5919BUR-1, CDLL5919B, CDLL5919C, CDLL5919D) have higher power dissipation capability and lower impedance (2 Ω vs. 5 Ω). These characteristics provide better thermal performance and voltage regulation. They are suitable as upgrades when thermal margin is limited or when tighter voltage tolerance is needed.

Q: Why do some substitute parts not specify power rating? A: CDLL4734 and CDLL4734A do not include explicit power rating specifications in the provided data. These parts are functionally equivalent to the 1 W rated CLL4734A TR based on their base part number designation and electrical characteristics.

Q: Can I use CDLL5919D instead of CLL4734A TR? A: Yes. CDLL5919D is a suitable substitute with enhanced specifications: 5.6 V nominal voltage, 1.25 W power rating, ±1% tolerance (tighter than the original ±5%), and 2 Ω impedance. It is recommended for applications requiring precision voltage regulation or higher thermal performance.

Q: Are all substitute parts available in the same package? A: Yes. All substitute parts use the DO-213AB MELF surface mount package, ensuring mechanical and electrical compatibility with the original CLL4734A TR footprint.

Q: What is the impact of tolerance differences on circuit performance? A: Tighter tolerance (±1%, ±2%, ±5%) provides more precise voltage regulation and is required for applications with strict voltage specifications. Wider tolerance (±10%) is acceptable in applications with adequate circuit margin. The original CLL4734A TR specifies ±5% tolerance.

Q: Can I use these parts interchangeably in production? A: Parts within the same tolerance and power rating group are interchangeable. However, substituting between groups (e.g., 1 W to 1.25 W, or ±5% to ±10%) requires circuit verification to confirm performance margins remain acceptable.

Q: What is the moisture sensitivity level (MSL) for these parts? A: All parts, including the original CLL4734A TR and all substitutes, carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Are there any compliance or certification differences? A: All parts are RoHS non-compliant and REACH Unaffected, matching the original part's compliance profile. All carry EAR99 ECCN classification and HTSUS code 8541.10.0050.

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