DL4748A-TP Equivalent & Substitute Parts

Part Overview

The DL4748A-TP is a Zener diode rated at 22 V, 1 W, designed for surface mount applications in the MELF (DO-213AB) package. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The part maintains ROHS3 compliance and operates across an extended temperature range of -65°C to 175°C.

Substiute Parts

DL4748A-TP

Micro Commercial CoIn Stock: 794DL4748A-TP Datasheet

Current PartRFQ

SMAJ4748A-TP

Micro Commercial CoIn Stock: 3330SMAJ4748A-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DL4748A-TP is determined by electrical parameter equivalence and compliance certification alignment. The primary substitute, SMAJ4748A-TP, maintains identical electrical specifications across all critical parameters: 22 V nominal Zener voltage, ±5% tolerance, 1 W maximum power dissipation, 23 Ohms maximum impedance, and 5 µA reverse leakage current at 16.7 V. Both parts are ROHS3 compliant and carry MSL 1 rating.

The key differentiator between the main part and its substitute is the package format. The DL4748A-TP uses the MELF (DO-213AB) package, while the SMAJ4748A-TP uses the DO-214AC (SMA) package. Both are surface mount technologies with equivalent thermal and electrical performance characteristics. The substitute part is currently in active production status, providing supply continuity for the obsolete DL4748A-TP.

Parameter Comparison

Engineering Selection Recommendations

The SMAJ4748A-TP serves as the direct electrical equivalent for the obsolete DL4748A-TP. Both components share identical Zener voltage, power rating, impedance, and leakage specifications. Selection between these parts depends on package compatibility within the target application.

For designs currently using the MELF (DO-213AB) package, the SMAJ4748A-TP requires PCB layout modification to accommodate the DO-214AC (SMA) footprint. The SMA package is more compact and widely supported in modern surface mount assembly processes.

The operating temperature range of the SMAJ4748A-TP extends to 150°C, compared to 175°C for the DL4748A-TP. Applications requiring operation above 150°C must retain the original DL4748A-TP specification or identify alternative suppliers.

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating, ensuring regulatory and environmental compatibility. The SMAJ4748A-TP is in active production status, providing superior long-term availability compared to the obsolete DL4748A-TP.

Frequently Asked Questions (FAQ)

Q: Can the SMAJ4748A-TP directly replace the DL4748A-TP without design changes?

A: Electrical substitution is direct. Package substitution requires PCB layout modification. The MELF (DO-213AB) and DO-214AC (SMA) packages have different footprints and land patterns. Mechanical compatibility must be verified against the target PCB design.

Q: What are the electrical differences between these parts?

A: Electrical specifications are identical: 22 V Zener voltage, ±5% tolerance, 1 W power rating, 23 Ohms impedance, and 5 µA reverse leakage. The forward voltage specification differs in test current (200 mA for DL4748A-TP versus 100 mA for SMAJ4748A-TP), but both specify 1.2 V maximum.

Q: Does the operating temperature range difference affect substitution?

A: The DL4748A-TP operates to 175°C, while the SMAJ4748A-TP operates to 150°C. Applications requiring operation above 150°C cannot use the SMAJ4748A-TP as a substitute. Applications operating within -65°C to 150°C are unaffected by this difference.

Q: Are both parts RoHS compliant?

A: Yes. Both the DL4748A-TP and SMAJ4748A-TP are ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating.

Q: Why is the DL4748A-TP obsolete?

A: The DL4748A-TP is classified as obsolete by the manufacturer. The SMAJ4748A-TP in DO-214AC (SMA) package represents the active production alternative for this electrical specification.

Q: What is the primary advantage of the SMAJ4748A-TP?

A: The SMAJ4748A-TP is in active production status, ensuring ongoing availability and supply continuity. The DO-214AC (SMA) package is also more compact and compatible with modern automated assembly equipment.