1SMA4743 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA4743 is an active-status zener diode manufactured by SMC Diode Solutions, rated for 13 V nominal zener voltage with 1 W maximum power dissipation. This surface mount component is packaged in the DO-214AC (SMA) form factor and is designed for voltage regulation and protection applications in electronic circuits. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Substiute Parts

1SMA4743

SMC Diode SolutionsIn Stock: 307361SMA4743 Datasheet

Current PartRFQ

SMAJ4743A-TP

Micro Commercial CoIn Stock: 8804SMAJ4743A-TP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1SMA4743 are identified based on strict electrical and mechanical parameter equivalence. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Zener voltage (Vz): 13 V nominal
• Power rating: 1 W maximum
• Tolerance: ±5%
• Impedance (Zzt): 10 Ohms maximum
• Reverse leakage current: 5 µA @ 9.9 V
• Forward voltage: 1.2 V maximum
• Operating temperature range: -65°C to 150°C
• Package type: DO-214AC (SMA) surface mount
• RoHS3 compliance
• MSL rating: 1 (Unlimited)

The SMAJ4743A-TP manufactured by Micro Commercial Co meets all specified electrical parameters and mechanical requirements, establishing it as a parametric equivalent for the 1SMA4743.

Parameter Comparison

Engineering Selection Recommendations

1SMA4743 (SMC Diode Solutions)

• Active product status with 30,700 units in stock
• ROHS3 compliant and REACH affected
• Suitable for applications requiring SMC manufacturer qualification or supply chain continuity

SMAJ4743A-TP (Micro Commercial Co)

• Active product status with 8,698 units in stock
• ROHS3 compliant and REACH unaffected
• Suitable for applications where REACH unaffected status is required or alternative manufacturer sourcing is acceptable
• Forward voltage specification applies at 100 mA test current versus 200 mA for the primary part

Both components satisfy identical electrical performance requirements and mechanical compatibility for DO-214AC (SMA) surface mount applications. Selection between these parts is determined by manufacturer preference, supply availability, and regulatory compliance requirements specific to the end application.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4743A-TP be used as a direct replacement for 1SMA4743 in existing designs?

A: Yes. Both components share identical zener voltage (13 V), power rating (1 W), tolerance (±5%), impedance (10 Ohms maximum), reverse leakage current (5 µA @ 9.9 V), and operating temperature range (-65°C to 150°C). Both are packaged in DO-214AC (SMA) surface mount form factor with equivalent electrical performance.

Q: What is the difference in forward voltage specifications between these parts?

A: The 1SMA4743 specifies forward voltage at 200 mA test current, while the SMAJ4743A-TP specifies forward voltage at 100 mA test current. Both are rated at 1.2 V maximum, meeting the same forward voltage requirement for circuit design purposes.

Q: Are there differences in compliance or regulatory status?

A: Both components are ROHS3 compliant with MSL rating 1 (Unlimited). The 1SMA4743 is REACH affected, while the SMAJ4743A-TP is REACH unaffected. Applications subject to REACH restrictions should specify the SMAJ4743A-TP variant.

Q: Does package compatibility affect substitution?

A: No. Both the 1SMA4743 and SMAJ4743A-TP use identical DO-214AC (SMA) surface mount packaging. PCB footprints, reflow profiles, and handling procedures are interchangeable.

Q: What inventory considerations apply to these substitutes?

A: The 1SMA4743 has 30,700 units in stock, while SMAJ4743A-TP has 8,698 units available. Substitute selection may be influenced by required delivery timelines and quantity requirements.