DL4743A-TP Equivalent & Substitute Parts

Part Overview

The DL4743A-TP is a Zener diode rated at 13 V with 1 W power dissipation, manufactured by Micro Commercial Co in a surface mount MELF package. This component is classified as obsolete, indicating limited availability for new procurement. The part operates across a temperature range of -65°C to 175°C and maintains ±5% voltage tolerance. Due to its obsolete status, identifying functionally equivalent substitute components is necessary for ongoing design support, production continuity, and long-term supply chain management.

Substiute Parts

DL4743A-TP

Micro Commercial CoIn Stock: 782DL4743A-TP Datasheet

Current PartRFQ

SMAJ4743A-TP

Micro Commercial CoIn Stock: 8804SMAJ4743A-TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the DL4743A-TP is determined by electrical and mechanical parameter alignment within the Zener diode category. The critical parameters governing substitution are:

Electrical Parameters:

• Zener voltage: 13 V nominal
• Power rating: 1 W maximum
• Voltage tolerance: ±5%
• Impedance: 10 Ohms maximum
• Reverse leakage current: 5 µA @ 9.9 V

Mechanical Parameters:

• Surface mount configuration
• Package compatibility or functional equivalence

Compliance Parameters:

• RoHS3 compliance
• MSL rating of 1 (Unlimited)

The substitute part SMAJ4743A-TP maintains identical electrical specifications for Zener voltage, power rating, tolerance, impedance, and reverse leakage characteristics. The primary difference is the package format: SMAJ4743A-TP uses DO-214AC (SMA) packaging instead of MELF, and operates at a maximum temperature of 150°C versus 175°C for the original part. Both components are surface mount, RoHS3 compliant, and carry MSL rating 1.

Parameter Comparison

Engineering Selection Recommendations

The SMAJ4743A-TP serves as a functional electrical equivalent to the DL4743A-TP for applications requiring a 13 V, 1 W Zener diode. Both components maintain identical electrical specifications across voltage, power, tolerance, impedance, and leakage parameters. Both are RoHS3 compliant and carry MSL rating 1.

The primary consideration for selection is package format and thermal operating range. The DL4743A-TP uses MELF packaging with a 175°C maximum operating temperature, while the SMAJ4743A-TP uses DO-214AC (SMA) packaging with a 150°C maximum operating temperature. Applications operating above 150°C require the original MELF package. Applications with thermal requirements at or below 150°C can utilize the SMA package substitute.

The SMAJ4743A-TP is currently in active production status, providing superior supply chain availability compared to the obsolete DL4743A-TP. For new designs or production continuity, the SMAJ4743A-TP is the recommended selection when thermal and package constraints permit.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4743A-TP directly replace DL4743A-TP in all applications?

A: Electrical substitution is valid when operating temperatures remain at or below 150°C. The SMAJ4743A-TP maintains identical Zener voltage (13 V), power rating (1 W), tolerance (±5%), impedance (10 Ohms), and reverse leakage specifications. Applications requiring operation above 150°C must retain the original DL4743A-TP or identify alternative components rated to 175°C.

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

A: The DL4743A-TP uses MELF (DO-213AB) packaging with a -65°C to 175°C operating range. The SMAJ4743A-TP uses SMA (DO-214AC) packaging with a -65°C to 150°C operating range. Electrical performance is identical across all specified parameters.

Q: Are both parts RoHS compliant?

A: Yes. Both DL4743A-TP and SMAJ4743A-TP are ROHS3 compliant and carry MSL rating 1 (Unlimited moisture sensitivity level).

Q: Does package size affect circuit performance?

A: Package format does not affect electrical performance. MELF and SMA packages are both surface mount configurations with identical electrical characteristics for this Zener diode. Package selection is determined by PCB layout constraints and thermal management requirements.

Q: Why is the DL4743A-TP listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The SMAJ4743A-TP is the active production equivalent, ensuring ongoing availability for new procurement and production orders.

Q: Can I use SMAJ4743A-TP in a design originally specified for DL4743A-TP?

A: Yes, provided the application operates within the SMAJ4743A-TP thermal range (-65°C to 150°C). PCB layout must accommodate the DO-214AC (SMA) package footprint. Electrical performance remains equivalent across all specified parameters.