DL4746A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The DL4746A-TP is an 18 V, 1 W surface mount Zener diode manufactured by Micro Commercial Co in MELF (DO-213AB) package configuration. This component is classified as obsolete, indicating discontinued production and limited availability for new designs. The part maintains ROHS3 compliance and REACH unaffected status. Due to its obsolete product status, identification of functionally equivalent substitute components is necessary for ongoing procurement, design continuity, and system maintenance applications.

Substiute Parts

DL4746A-TP

Micro Commercial CoIn Stock: 5670DL4746A-TP Datasheet

Current PartRFQ

SMAJ4746A-TP

Micro Commercial CoIn Stock: 2495SMAJ4746A-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DL4746A-TP is determined by equivalence across the following critical electrical parameters: nominal Zener voltage (18 V), maximum power dissipation (1 W), voltage tolerance (±5%), maximum impedance (20 Ohms), reverse leakage current (5 µA @ 13.7 V), and forward voltage characteristics (1.2 V maximum). All substitute components must maintain surface mount configuration and comply with ROHS3 and REACH requirements.

The SMAJ4746A-TP qualifies as a functional substitute based on matching electrical specifications across all critical parameters. The primary distinction between the main part and substitute lies in package configuration: the DL4746A-TP uses MELF (DO-213AB) package, while the SMAJ4746A-TP uses DO-214AC (SMA) package. Both packages are surface mount technologies with different footprint geometries and land patterns.

Parameter Comparison

Engineering Selection Recommendations

The SMAJ4746A-TP serves as the primary substitute for the obsolete DL4746A-TP based on electrical parameter equivalence and active product status. The substitute maintains all critical Zener diode specifications including nominal voltage, power rating, tolerance, impedance, and leakage characteristics. Both components carry identical compliance certifications (ROHS3 Compliant, REACH Unaffected) and unlimited moisture sensitivity classification.

Selection of the SMAJ4746A-TP requires PCB redesign to accommodate the DO-214AC (SMA) package footprint in place of the original MELF (DO-213AB) package. The operating temperature range of the substitute extends to 150°C maximum, compared to 175°C for the main part; this represents a 25°C reduction in upper temperature limit and must be evaluated against application thermal requirements. The forward voltage specification differs at the measurement current point (100 mA versus 200 mA), though the maximum forward voltage remains 1.2 V.

Frequently Asked Questions (FAQ)

Q: Can the SMAJ4746A-TP directly replace the DL4746A-TP without PCB modification?

A: No. The SMAJ4746A-TP uses DO-214AC (SMA) package while the DL4746A-TP uses DO-213AB (MELF) package. These packages have different footprint geometries and land patterns, requiring PCB redesign and component placement adjustment.

Q: Are the electrical characteristics identical between these parts?

A: The critical Zener diode parameters are equivalent: 18 V nominal voltage, 1 W power rating, ±5% tolerance, 20 Ohms maximum impedance, and 5 µA reverse leakage current. Forward voltage maximum is 1.2 V for both parts, though measured at different current points.

Q: What is the significance of the operating temperature range difference?

A: The DL4746A-TP operates to 175°C maximum, while the SMAJ4746A-TP operates to 150°C maximum. Applications requiring operation above 150°C cannot use the substitute without thermal performance verification.

Q: Why is the DL4746A-TP classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The SMAJ4746A-TP maintains active product status, ensuring ongoing availability and supply chain continuity.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both the DL4746A-TP and SMAJ4746A-TP are ROHS3 compliant, REACH unaffected, and carry unlimited moisture sensitivity classification (MSL 1).

Q: What packaging options are available for the substitute?

A: The SMAJ4746A-TP is supplied in Cut Tape (CT) and Digi-Reel packaging formats, providing flexibility for different procurement and assembly workflows.