DL4739A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The DL4739A-TP is a 9.1 V, 1 W Zener diode manufactured by Micro Commercial Co in MELF (DO-213AB) surface mount packaging. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and production continuity. The substitute part SMAJ4739A-TP maintains identical electrical specifications while offering active product status and improved inventory availability.

Substiute Parts

DL4739A-TP

Micro Commercial CoIn Stock: 914DL4739A-TP Datasheet

Current PartRFQ

SMAJ4739A-TP

Micro Commercial CoIn Stock: 6951SMAJ4739A-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DL4739A-TP is determined by the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Zener voltage: 9.1 V nominal
• Tolerance: ±5%
• Maximum power dissipation: 1 W
• Maximum impedance: 5 Ohms
• Reverse leakage current: 10 µA @ 7 V

Mechanical Compatibility Criteria:

• Surface mount technology
• RoHS3 compliance
• Moisture sensitivity level 1

The SMAJ4739A-TP substitute part satisfies all electrical parameters and compliance requirements. The primary difference is the package format: SMAJ4739A-TP uses DO-214AC (SMA) packaging instead of the MELF (DO-213AB) format of the original part. This substitution is valid for applications where the DO-214AC footprint can be accommodated in the circuit design.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SMAJ4739A-TP

The SMAJ4739A-TP is the direct electrical equivalent of the DL4739A-TP. Selection of this substitute is supported by:

1. Product Status: SMAJ4739A-TP holds active product status, ensuring long-term availability and supply chain continuity compared to the obsolete DL4739A-TP.

2. Electrical Equivalence: All critical zener parameters (voltage, tolerance, power rating, impedance, and leakage current) are identical between the two parts.

3. Compliance: Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings, satisfying regulatory and environmental requirements.

4. Packaging Consideration: The substitute uses DO-214AC (SMA) packaging instead of MELF (DO-213AB). This difference requires PCB footprint modification but does not affect electrical performance. The SMA package is widely supported in modern manufacturing environments.

5. Temperature Range: The substitute operates across -65°C to 150°C, which covers the majority of industrial and commercial applications. Applications requiring operation above 150°C must retain the original DL4739A-TP or identify alternative solutions.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4739A-TP directly replace DL4739A-TP without circuit modification?

A: The SMAJ4739A-TP is electrically equivalent and can replace the DL4739A-TP in circuit function. However, the package format differs (DO-214AC SMA versus DO-213AB MELF), requiring PCB footprint redesign. No circuit schematic changes are necessary.

Q: What is the primary difference between these two parts?

A: The primary difference is the surface mount package format. DL4739A-TP uses MELF (DO-213AB) packaging, while SMAJ4739A-TP uses SMA (DO-214AC) packaging. All electrical specifications are identical.

Q: Are there temperature range limitations when substituting?

A: The SMAJ4739A-TP operates from -65°C to 150°C, compared to the DL4739A-TP range of -65°C to 175°C. For applications requiring operation above 150°C, the original part specification must be maintained or alternative components evaluated.

Q: Does the forward voltage specification differ between these parts?

A: The forward voltage maximum is specified at different current levels: DL4739A-TP at 200 mA and SMAJ4739A-TP at 100 mA. Both specify 1.2 V maximum, making them compatible for typical circuit applications.

Q: What is the inventory status of these parts?

A: DL4739A-TP is obsolete with 901 pieces in stock. SMAJ4739A-TP is active with 6876 pieces available, providing superior supply chain security for new designs and production continuity.

Q: Are both parts RoHS compliant?

A: Yes, both DL4739A-TP and SMAJ4739A-TP are ROHS3 compliant with identical moisture sensitivity levels (MSL 1, Unlimited), satisfying environmental and regulatory requirements.