SML4748HE3_A/I Zener Diode Equivalent & Substitute Parts

Part Overview

The SML4748HE3_A/I is an automotive-grade Zener diode manufactured by Vishay General Semiconductor - Diodes Division. This component is a 22 V, 1 W surface mount device in the DO-214AC (SMA) package with ±10% voltage tolerance. The part is active in production and carries AEC-Q101 automotive qualification. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design flexibility, or supply chain considerations.

Substiute Parts

SML4748HE3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1026SML4748HE3_A/I Datasheet

Current PartRFQ

SML4748A-E3/61

Vishay General Semiconductor - Diodes DivisionIn Stock: 30348SML4748A-E3/61 Datasheet

Parametric EquivalentRFQ

SML4748AHE3_A/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 2662SML4748AHE3_A/H Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of Zener diodes is determined by equivalence in the following critical parameters:

• Zener Voltage (Vz): Must be 22 V nominal
• Power Dissipation (Pmax): Must be 1 W
• Package / Case: Must be DO-214AC (SMA) for mechanical and thermal compatibility
• Mounting Type: Must be Surface Mount
• Operating Temperature: Must support 150°C maximum
• Impedance (Zzt): Must be 23 Ohms maximum

Voltage tolerance (±10% or ±5%) and automotive qualification (AEC-Q101) are secondary parameters that define performance grades within the substitution group. All identified substitutes maintain identical nominal voltage, power rating, package, and thermal specifications.

Parameter Comparison

Engineering Selection Recommendations

SML4748AHE3_A/H is a direct substitute for applications requiring automotive-grade components with AEC-Q101 qualification. This part maintains identical electrical specifications and package compatibility while offering improved voltage tolerance (±5% versus ±10%). The automotive grade and AEC-Q101 qualification align with the main part's specifications. Current inventory is 2,557 units.

SML4748A-E3/61 is a parametric equivalent suitable for non-automotive applications or designs where automotive qualification is not required. This part provides identical electrical performance and package compatibility with improved voltage tolerance (±5%). The absence of automotive grade and AEC-Q101 qualification distinguishes this option from the main part. Current inventory is 30,250 units, providing superior availability.

Selection between substitutes depends on application requirements: automotive-qualified designs must use SML4748AHE3_A/H; general-purpose applications may use SML4748A-E3/61 based on availability and cost considerations.

Frequently Asked Questions (FAQ)

Q: Can SML4748A-E3/61 be used in automotive applications?

A: SML4748A-E3/61 lacks automotive grade designation and AEC-Q101 qualification. Use of this part in automotive applications is determined by design specifications and regulatory requirements. The part is electrically and mechanically compatible but does not carry automotive certification.

Q: What is the difference between ±10% and ±5% tolerance?

A: Tolerance defines the acceptable range of Zener voltage variation from the nominal 22 V specification. SML4748HE3_A/I allows 19.8 V to 24.2 V; SML4748AHE3_A/H and SML4748A-E3/61 allow 20.9 V to 23.1 V. Tighter tolerance (±5%) provides more precise voltage regulation in sensitive applications.

Q: Are all three parts mechanically interchangeable?

A: Yes. All three parts use the DO-214AC (SMA) package and surface mount configuration. Footprint, solder pad layout, and thermal characteristics are identical, enabling direct board-level substitution.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. It certifies that the component meets automotive reliability, quality, and performance requirements. SML4748HE3_A/I and SML4748AHE3_A/H carry this qualification; SML4748A-E3/61 does not.

Q: Can I substitute SML4748AHE3_A/H for SML4748HE3_A/I?

A: Yes. SML4748AHE3_A/H is a direct substitute with identical electrical specifications, package, automotive grade, and AEC-Q101 qualification. The improved ±5% tolerance provides enhanced performance.

Q: Which part should I select for maximum inventory availability?

A: SML4748A-E3/61 has the highest inventory at 30,250 units. This part is suitable for applications where automotive qualification is not required. For automotive-qualified designs, SML4748AHE3_A/H is available with 2,557 units in stock.