DL4734A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The DL4734A-TP is a 5.6 V, 1 W surface mount zener diode manufactured by Micro Commercial Co in MELF (DO-213AB) package format. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating, making it suitable for industrial and commercial applications requiring voltage regulation and transient protection.

Substiute Parts

DL4734A-TP

Micro Commercial CoIn Stock: 943DL4734A-TP Datasheet

Current PartRFQ

SMAJ4734A-TP

Micro Commercial CoIn Stock: 1539SMAJ4734A-TP Datasheet

SimilarRFQ

CDLL3827A/TR

Microchip TechnologyIn Stock: 807CDLL3827A/TR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DL4734A-TP is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

• Zener voltage: 5.6 V nominal
• Tolerance: ±5%
• Maximum power dissipation: 1 W
• Impedance (maximum): 5 Ohms
• Reverse leakage current: 10 µA @ 2 V (or lower)
• Forward voltage: 1.2 V @ 200 mA (or lower)

Mechanical Parameters (Must Match or Be Compatible):

• Mounting type: Surface Mount
• Package format: DO-213AB (MELF) or equivalent surface mount package
• Operating temperature range: -65°C to 175°C (or wider)

Compliance Parameters:

• RoHS3 compliance required
• REACH unaffected status required

Two substitute parts meet these criteria with documented electrical and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

SMAJ4734A-TP (Micro Commercial Co)

This substitute maintains identical electrical specifications (5.6 V, 1 W, ±5% tolerance, 5 Ohms impedance) and is manufactured by the same supplier as the main part. The component is in active production status with higher inventory availability (1500 pcs). The primary design consideration is package format: SMAJ4734A-TP uses DO-214AC (SMA) package instead of DO-213AB (MELF). This substitution requires PCB layout modification to accommodate the different footprint. Operating temperature range is -65°C to 150°C, which is 25°C lower than the main part's maximum. Selection of this substitute is appropriate for applications where the reduced upper temperature limit does not conflict with system requirements and where PCB redesign is feasible.

CDLL3827A/TR (Microchip Technology)

This substitute provides parametric equivalence with identical electrical specifications and maintains the same DO-213AB (MELF) package format as the main part, eliminating the need for PCB layout modification. The component is in active production status with documented inventory (732 pcs). Reverse leakage current is superior at 3 µA @ 1 V compared to the main part's 10 µA @ 2 V. Operating temperature range matches the main part at -65°C to 175°C. This substitute is suitable for direct replacement in existing designs without mechanical redesign. The cross-manufacturer substitution (Microchip Technology) maintains full compliance with RoHS3 and REACH requirements.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4734A-TP be used as a direct replacement for DL4734A-TP without PCB modification?

A: No. SMAJ4734A-TP uses DO-214AC (SMA) package format, while DL4734A-TP uses DO-213AB (MELF) package format. These packages have different footprints and pin configurations. PCB layout redesign is required for this substitution.

Q: Can CDLL3827A/TR be used as a direct replacement for DL4734A-TP without PCB modification?

A: Yes. CDLL3827A/TR maintains the same DO-213AB (MELF) package format as DL4734A-TP. Electrical specifications are equivalent, and the component can be substituted without PCB redesign.

Q: What is the difference between DO-213AB (MELF) and DO-214AC (SMA) packages?

A: DO-213AB (MELF) and DO-214AC (SMA) are distinct surface mount package formats with different physical dimensions and footprints. MELF packages are cylindrical, while SMA packages are rectangular. Each requires specific PCB pad layouts and assembly processes.

Q: Are all three parts RoHS3 compliant?

A: Yes. DL4734A-TP, SMAJ4734A-TP, and CDLL3827A/TR are all ROHS3 compliant and REACH unaffected.

Q: What is the operating temperature difference between the substitutes?

A: DL4734A-TP and CDLL3827A/TR both operate from -65°C to 175°C. SMAJ4734A-TP operates from -65°C to 150°C, providing 25°C less maximum temperature capability. Applications requiring operation above 150°C must use either the main part or CDLL3827A/TR.

Q: Why is the reverse leakage current specification different for CDLL3827A/TR?

A: CDLL3827A/TR specifies reverse leakage current at 1 V (3 µA), while DL4734A-TP specifies it at 2 V (10 µA). The lower leakage current at lower voltage in CDLL3827A/TR indicates superior performance characteristics. Both specifications meet the electrical requirements for 5.6 V zener diode applications.

Q: Can these parts be used interchangeably in all circuit applications?

A: Electrical interchangeability is confirmed for all three parts based on zener voltage, power rating, impedance, and tolerance specifications. Mechanical interchangeability depends on package format compatibility with existing PCB designs. CDLL3827A/TR provides full interchangeability without redesign. SMAJ4734A-TP requires PCB modification due to package format differences.