1SMA4749 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA4749 is an active-status zener diode manufactured by SMC Diode Solutions, rated for 24 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 to provide design flexibility, inventory alternatives, and supply chain continuity while maintaining electrical and mechanical compatibility.

Substiute Parts

1SMA4749

SMC Diode SolutionsIn Stock: 79081SMA4749 Datasheet

Current PartRFQ

SMAJ4749A-TP

Micro Commercial CoIn Stock: 1504SMAJ4749A-TP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1SMA4749 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Voltage - Zener (Nom): 24 V
• Power - Max: 1 W
• Tolerance: ±5%
• Package / Case: DO-214AC (SMA)
• Mounting Type: Surface Mount
• Operating Temperature Range: -65°C to 150°C
• Impedance (Max): 25 Ohms
• Current - Reverse Leakage @ Vr: 5 µA @ 18.2 V

The substitute part SMAJ4749A-TP, manufactured by Micro Commercial Co, meets all critical electrical specifications and mechanical packaging requirements, enabling direct functional replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 1SMA4749 and SMAJ4749A-TP are active-status products with ROHS3 compliance and identical moisture sensitivity ratings. Selection between these components is based on availability, supply chain requirements, and inventory status rather than electrical or mechanical performance differences.

The 1SMA4749 (SMC Diode Solutions) is suitable for applications requiring SMC manufacturer certification. The SMAJ4749A-TP (Micro Commercial Co) provides an equivalent alternative with identical electrical specifications and packaging.

Both components are suitable for voltage regulation, transient suppression, and protection circuits operating within the specified temperature range of -65°C to 150°C.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4749A-TP replace 1SMA4749 in existing designs?

A: Yes. Both components share identical zener voltage (24 V), power rating (1 W), tolerance (±5%), impedance (25 Ohms), reverse leakage current (5 µA @ 18.2 V), operating temperature range (-65°C to 150°C), and package type (DO-214AC/SMA). Direct substitution is electrically and mechanically compatible.

Q: Are there package differences between these parts?

A: No. Both the 1SMA4749 and SMAJ4749A-TP use the DO-214AC (SMA) surface mount package. Footprint, lead spacing, and mounting requirements are identical.

Q: What is the difference in forward voltage specifications?

A: The 1SMA4749 specifies forward voltage at 200 mA, while SMAJ4749A-TP specifies it at 100 mA. Both maintain the same maximum forward voltage of 1.2 V, ensuring compatible circuit behavior in forward-biased conditions.

Q: Do both parts meet RoHS compliance requirements?

A: Yes. Both the 1SMA4749 and SMAJ4749A-TP are ROHS3 compliant, meeting environmental and material restriction standards.

Q: What is the moisture sensitivity rating for these components?

A: Both components have a Moisture Sensitivity Level (MSL) of 1, indicating unlimited shelf life without moisture control requirements.

Q: Are these parts suitable for high-temperature applications?

A: Yes. Both components operate across the temperature range of -65°C to 150°C, supporting applications in industrial and automotive environments requiring extended thermal performance.