DL4747A-TP Equivalent & Substitute Parts

Part Overview

The DL4747A-TP is a Zener diode rated at 20 V, 1 W with ±5% tolerance, manufactured by Micro Commercial Co in a Surface Mount MELF (DO-213AB) package. This component is classified as Obsolete, indicating discontinuation from the original manufacturer. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for applications utilizing this voltage regulation component.

Substiute Parts

DL4747A-TP

Micro Commercial CoIn Stock: 845DL4747A-TP Datasheet

Current PartRFQ

SMAJ4747A-TP

Micro Commercial CoIn Stock: 31171SMAJ4747A-TP Datasheet

SimilarRFQ

1N4747AUR/TR

Microchip TechnologyIn Stock: 9991N4747AUR/TR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DL4747A-TP are identified based on strict electrical and mechanical parameter matching within the Zener diode category. The substitution logic is based on the following critical parameters:

Electrical Parameters (Must Match):

• Voltage - Zener (Nom): 20 V
• Tolerance: ±5%
• Power - Max: 1 W
• Impedance (Max): 22 Ohms
• Current - Reverse Leakage @ Vr: 5 µA @ 15.2 V
• Voltage - Forward (Vf) (Max): 1.2 V

Mechanical Parameters (Must Match or Be Compatible):

• Mounting Type: Surface Mount
• Package / Case: DO-213AB (MELF) or equivalent surface mount packages
• Moisture Sensitivity Level: 1 (Unlimited)

Compliance Parameters (Must Match):

• RoHS Status: ROHS3 Compliant
• REACH Status: REACH Unaffected

Substitute parts are grouped into two categories: Direct Package Equivalent (same MELF package) and Parametric Equivalent with Alternative Package (same electrical specifications, different surface mount package). Both categories maintain identical electrical performance and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

1N4747AUR/TR (Microchip Technology) - Recommended Primary Substitute

The 1N4747AUR/TR is the optimal substitute for the obsolete DL4747A-TP. This part maintains identical electrical specifications, including 20 V nominal Zener voltage, 1 W power rating, 22 Ohms maximum impedance, and 5 µA reverse leakage current. The package is identical (DO-213AB, MELF), ensuring direct mechanical compatibility with existing PCB layouts. The operating temperature range (-65°C ~ 175°C) matches the original specification. Product status is Active, providing long-term supply availability. RoHS3 compliance and REACH unaffected status align with regulatory requirements. Microchip Technology is an established manufacturer with robust supply chain infrastructure.

SMAJ4747A-TP (Micro Commercial Co) - Alternative Substitute

The SMAJ4747A-TP provides electrical equivalence with a package variant. All critical electrical parameters match the DL4747A-TP: 20 V Zener voltage, 1 W power rating, 22 Ohms impedance, and 5 µA reverse leakage. The package differs (DO-214AC/SMA instead of DO-213AB/MELF), requiring PCB layout modification. The operating temperature range is -65°C ~ 150°C, which is 25°C lower than the original specification at the upper limit. Product status is Active with high inventory availability (31,069 units). RoHS3 compliance and REACH unaffected status are maintained. This substitute is suitable for applications where the reduced upper temperature limit is acceptable and PCB redesign is feasible.

Frequently Asked Questions (FAQ)

Q: Can the 1N4747AUR/TR be used as a direct replacement for the DL4747A-TP without PCB modification?

A: Yes. The 1N4747AUR/TR uses the identical DO-213AB (MELF) package and maintains all electrical specifications. No PCB layout changes are required for mechanical or electrical compatibility.

Q: What is the primary difference between the 1N4747AUR/TR and SMAJ4747A-TP substitutes?

A: The 1N4747AUR/TR retains the original MELF package (DO-213AB), while the SMAJ4747A-TP uses an SMA package (DO-214AC). Both maintain identical electrical performance. The SMAJ4747A-TP requires PCB redesign due to different package footprint and pin configuration.

Q: Are there temperature rating differences between the substitutes?

A: Yes. The 1N4747AUR/TR maintains the original -65°C ~ 175°C operating range. The SMAJ4747A-TP has a reduced upper limit of 150°C. Applications requiring operation above 150°C must use the 1N4747AUR/TR.

Q: Do all substitute parts meet the same regulatory compliance standards?

A: Yes. All listed substitutes (DL4747A-TP, 1N4747AUR/TR, and SMAJ4747A-TP) are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Q: What is the forward voltage difference between the SMAJ4747A-TP and other substitutes?

A: The SMAJ4747A-TP specifies forward voltage at 100 mA, while the DL4747A-TP and 1N4747AUR/TR specify it at 200 mA. Both maintain the 1.2 V maximum rating at their respective test currents, indicating equivalent forward voltage characteristics.

Q: Is the 1N4747AUR/TR available in sufficient quantity for production use?

A: Yes. Current inventory shows 988 units in stock with Active product status from Microchip Technology, ensuring ongoing availability for production requirements.

Q: Can the SMAJ4747A-TP be used in applications with unlimited moisture exposure?

A: Yes. The SMAJ4747A-TP has Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or operation.