DL4758A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The DL4758A-TP is a 56 V, 1 W surface mount Zener diode manufactured by Micro Commercial Co in MELF (DO-213AB) package configuration. This component is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to support ongoing design requirements, legacy system maintenance, and procurement continuity where original inventory becomes depleted or unavailable.

Substiute Parts

DL4758A-TP

Micro Commercial CoIn Stock: 1242DL4758A-TP Datasheet

Current PartRFQ

SMAJ4758A-TP

Micro Commercial CoIn Stock: 911SMAJ4758A-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DL4758A-TP is determined by electrical parameter equivalence and mechanical compatibility. The primary substitute identified is the SMAJ4758A-TP, which maintains identical electrical specifications across all critical parameters: 56 V nominal Zener voltage, 1 W maximum power rating, ±5% tolerance, 110 Ohms maximum impedance, and 5 µA reverse leakage current at 42.6 V.

The key differentiator between the main part and its substitute is the package configuration. The DL4758A-TP uses MELF (DO-213AB) package, while the SMAJ4758A-TP uses DO-214AC (SMA) package. Both are surface mount configurations with identical electrical performance within the specified parameters.

Substitution eligibility is based on the following criteria:

• Zener voltage (Nominal): 56 V
• Power rating (Maximum): 1 W
• Voltage tolerance: ±5%
• Impedance (Maximum): 110 Ohms
• Reverse leakage current: 5 µA @ 42.6 V
• RoHS3 compliance
• Moisture Sensitivity Level 1

Parameter Comparison

Engineering Selection Recommendations

The SMAJ4758A-TP is a direct electrical equivalent to the DL4758A-TP with the following considerations:

Electrical Compatibility: All critical electrical parameters are identical, including Zener voltage, power rating, tolerance, impedance, and reverse leakage current specifications. The substitute part maintains full functional equivalence for circuit operation.

Regulatory Compliance: Both parts are ROHS3 compliant and carry identical moisture sensitivity ratings (MSL 1, Unlimited). No compliance barriers exist for substitution.

Product Status: The DL4758A-TP is obsolete, while the SMAJ4758A-TP is active product status. The substitute part offers improved long-term availability and supply chain continuity.

Temperature Operating Range: The main part operates from -65°C to 175°C, while the substitute operates from -65°C to 150°C. Applications requiring operation above 150°C junction temperature require evaluation against specific circuit thermal requirements.

Package Configuration: The primary difference is mechanical. The DL4758A-TP uses MELF (DO-213AB) package, while SMAJ4758A-TP uses DO-214AC (SMA) package. PCB layout and footprint modifications are required for substitution. Both are surface mount configurations with equivalent electrical performance.

Frequently Asked Questions (FAQ)

Q: Can the SMAJ4758A-TP directly replace the DL4758A-TP in existing designs?

A: Electrical substitution is valid. However, the package difference (MELF versus SMA) requires PCB footprint modification. The MELF package (DO-213AB) and SMA package (DO-214AC) have different physical dimensions and land patterns.

Q: Are there electrical performance differences between these parts?

A: No. Both parts share identical Zener voltage (56 V), power rating (1 W), tolerance (±5%), impedance (110 Ohms maximum), and reverse leakage current (5 µA @ 42.6 V) specifications.

Q: What is the temperature operating range difference?

A: The DL4758A-TP operates from -65°C to 175°C, while the SMAJ4758A-TP operates from -65°C to 150°C. Applications operating above 150°C junction temperature must evaluate thermal performance requirements against the substitute part's maximum rating.

Q: Why is the DL4758A-TP classified as obsolete?

A: The DL4758A-TP is marked as obsolete product status. The SMAJ4758A-TP is the active equivalent offering continued availability and supply chain support.

Q: What compliance certifications apply to both parts?

A: Both the DL4758A-TP and SMAJ4758A-TP are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings.

Q: Are there inventory considerations for these parts?

A: The DL4758A-TP has 1162 pieces in stock (obsolete status). The SMAJ4758A-TP has 842 pieces in stock (active status). Long-term procurement should prioritize the active substitute part.