DL4757A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The DL4757A-TP is a 51 V, 1 W Zener diode manufactured by Micro Commercial Co in a Surface Mount MELF (DO-213AB) package. This component functions as a voltage regulator and protective device in electronic circuits. The part is classified as Obsolete, necessitating identification of equivalent substitute components for new designs and ongoing production requirements. Active equivalent parts are available from both the original manufacturer and alternative suppliers that maintain identical or compatible electrical and mechanical specifications.

Substiute Parts

DL4757A-TP

Micro Commercial CoIn Stock: 1247DL4757A-TP Datasheet

Current PartRFQ

SMAJ4757A-TP

Micro Commercial CoIn Stock: 6489SMAJ4757A-TP Datasheet

SimilarRFQ

1N4757AUR/TR

Microchip TechnologyIn Stock: 11531N4757AUR/TR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DL4757A-TP are identified based on strict electrical and mechanical parameter matching. The substitution logic is based on the following criteria:

Primary Matching Parameters:

• Voltage - Zener (Nominal): 51 V
• Power - Maximum: 1 W
• Tolerance: ±5%
• Impedance (Maximum): 95 Ohms
• Current - Reverse Leakage: 5 µA
• Voltage - Forward (Maximum): 1.2 V
• Operating Temperature Range: -65°C to 175°C (or compatible subset)
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories:

Category 1: Package-Compatible Substitutes - Parts maintaining the same DO-213AB MELF package configuration with identical electrical specifications.

Category 2: Parametric Equivalents with Alternative Packaging - Parts with identical electrical specifications but different surface mount package types (DO-214AC/SMA), suitable for designs where package footprint flexibility exists.

Parameter Comparison

Engineering Selection Recommendations

1N4757AUR/TR (Microchip Technology)

This part is the primary direct substitute for the DL4757A-TP. It maintains identical electrical specifications and the same DO-213AB MELF package configuration. The 1N4757AUR/TR is manufactured by Microchip Technology and carries Active product status, ensuring long-term availability and supply chain stability. Operating temperature range extends to 175°C, matching the original part. This substitute is suitable for direct replacement in existing designs without PCB layout modifications.

SMAJ4757A-TP (Micro Commercial Co)

This part provides an alternative from the original manufacturer with identical electrical specifications. The SMAJ4757A-TP uses the DO-214AC (SMA) package instead of MELF, resulting in a different footprint and land pattern. The operating temperature range is -65°C to 150°C, which is 25°C lower than the original specification. This substitute is appropriate for applications where the lower temperature ceiling is acceptable and where the SMA package footprint is compatible with the circuit board design. Active product status ensures availability.

Selection Criteria:

• For direct replacement without PCB redesign: Select 1N4757AUR/TR
• For designs tolerating SMA package footprint and -65°C to 150°C temperature range: Select SMAJ4757A-TP
• Both substitutes maintain ROHS3 compliance and REACH Unaffected status
• All parts are surface mount devices suitable for automated assembly

Frequently Asked Questions (FAQ)

Q: Can the 1N4757AUR/TR directly replace the DL4757A-TP on existing PCBs?

A: Yes. The 1N4757AUR/TR maintains the same DO-213AB MELF package, identical electrical specifications, and matching operating temperature range (-65°C to 175°C). No PCB layout modifications are required.

Q: What is the primary difference between the 1N4757AUR/TR and SMAJ4757A-TP?

A: The primary difference is the package type. The 1N4757AUR/TR uses DO-213AB MELF, while the SMAJ4757A-TP uses DO-214AC SMA. Both maintain identical electrical specifications (51 V, 1 W, ±5% tolerance, 95 Ohms impedance). The SMAJ4757A-TP has a reduced operating temperature range of -65°C to 150°C compared to 175°C for the 1N4757AUR/TR.

Q: Is the SMAJ4757A-TP suitable for applications requiring the full -65°C to 175°C temperature range?

A: No. The SMAJ4757A-TP operates only to 150°C maximum. For applications requiring operation to 175°C, the 1N4757AUR/TR is the appropriate selection.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both the 1N4757AUR/TR and SMAJ4757A-TP are ROHS3 Compliant and REACH Unaffected, matching the compliance status of the original DL4757A-TP.

Q: What is the difference in reverse leakage current specifications between substitutes?

A: The DL4757A-TP and 1N4757AUR/TR specify 5 µA @ 38.8 V. The SMAJ4757A-TP specifies 5 µA @ 51 V. Both meet the 5 µA maximum leakage requirement; the measurement voltage differs due to package-specific characterization.

Q: Can I use the SMAJ4757A-TP in a design originally specified for the DL4757A-TP?

A: Only if the circuit design accommodates the DO-214AC SMA footprint and the operating temperature range does not exceed 150°C. PCB layout modifications are required due to the different package geometry.

Q: What is the product status of each substitute?

A: The DL4757A-TP is Obsolete. Both substitutes carry Active product status: 1N4757AUR/TR (Microchip Technology) and SMAJ4757A-TP (Micro Commercial Co), ensuring continued availability and supply chain support.