SML4755HE3_A/I Zener Diode Equivalent & Substitute Parts

Part Overview

The SML4755HE3_A/I is a 43 V, 1 W surface mount zener diode manufactured by Vishay General Semiconductor - Diodes Division in the DO-214AC (SMA) package. This component is classified as an active product with automotive-grade qualification (AEC-Q101) and is RoHS3 compliant. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference circuits where precise voltage clamping at 43 V is required. Alternative part numbers within the same electrical and mechanical specifications are available to support supply chain flexibility, inventory optimization, and design continuity.

Substiute Parts

SML4755HE3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 954SML4755HE3_A/I Datasheet

Current PartRFQ

SML4755A-E3/61

Vishay General Semiconductor - Diodes DivisionIn Stock: 1980SML4755A-E3/61 Datasheet

Parametric EquivalentRFQ

SML4755AHE3_A/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 2854SML4755AHE3_A/H Datasheet

Parametric EquivalentRFQ

SML4755AHE3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 8508SML4755AHE3_A/I Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of zener diodes is determined by electrical and mechanical parameter alignment. The primary substitution criteria for the SML4755HE3_A/I are:

Critical Parameters for Substitution:

• Zener voltage (Vz): 43 V nominal
• Maximum power dissipation: 1 W
• Package type: DO-214AC (SMA) surface mount
• Maximum impedance: 70 Ohms
• Reverse leakage current: 5 µA @ 32.7 V
• Operating temperature rating: 150°C
• Automotive grade and AEC-Q101 qualification
• RoHS3 compliance

The substitute parts listed below maintain identical electrical performance characteristics and package specifications. Variations in tolerance (±10% versus ±5%) represent tighter voltage accuracy in certain alternatives and do not prevent functional substitution. All substitute parts are active products from the same manufacturer with equivalent automotive qualification and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are active products manufactured by Vishay General Semiconductor - Diodes Division and maintain full electrical and mechanical compatibility with the SML4755HE3_A/I.

SML4755A-E3/61: This part offers tighter voltage tolerance (±5% versus ±10%) and maintains all electrical specifications. It does not carry explicit automotive grade designation in the provided data, though it meets RoHS3 compliance and identical electrical parameters. Selection of this part is appropriate for applications where tighter voltage accuracy is beneficial and automotive qualification is not a mandatory requirement.

SML4755AHE3_A/H and SML4755AHE3_A/I: Both parts provide tighter voltage tolerance (±5%) and carry full automotive-grade designation with AEC-Q101 qualification, matching the main part's compliance profile. These parts are direct functional equivalents with enhanced voltage accuracy. The SML4755AHE3_A/I variant offers the highest inventory availability (8,459 pieces) among all listed substitutes.

Selection between substitute parts should be based on application requirements for voltage tolerance, automotive qualification necessity, and inventory availability. All parts are surface mount components in the DO-214AC (SMA) package with identical footprints and soldering requirements.

Frequently Asked Questions (FAQ)

Q: Can SML4755A-E3/61 be used as a direct replacement for SML4755HE3_A/I in automotive applications?

A: SML4755A-E3/61 maintains identical electrical specifications and RoHS3 compliance. However, it does not carry explicit automotive-grade designation or AEC-Q101 qualification in the provided specifications. For applications requiring automotive qualification, SML4755AHE3_A/H or SML4755AHE3_A/I are recommended.

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

A: Tolerance refers to the allowable deviation of the zener voltage from the nominal 43 V specification. The ±10% tolerance (SML4755HE3_A/I) allows voltage variation between 38.7 V and 47.3 V. The ±5% tolerance variants (SML4755A-E3/61, SML4755AHE3_A/H, SML4755AHE3_A/I) allow variation between 40.85 V and 45.15 V. Tighter tolerance provides more precise voltage regulation.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All listed parts use the DO-214AC (SMA) surface mount package with identical mechanical dimensions and pin configuration. No PCB layout modifications are required for substitution.

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

A: AEC-Q101 is an automotive electronics qualification standard. Parts meeting this qualification have undergone testing for reliability and performance in automotive environments. SML4755HE3_A/I, SML4755AHE3_A/H, and SML4755AHE3_A/I carry this qualification. Applications requiring automotive-grade components should specify one of these three part numbers.

Q: Can these parts be used interchangeably in the same design without circuit modification?

A: Yes. All substitute parts maintain identical electrical specifications for zener voltage, power dissipation, impedance, and leakage current. Circuit performance remains unchanged with any of the listed substitutes. Tolerance differences do not require circuit redesign.

Q: What does RoHS3 compliance indicate?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials including lead, cadmium, and mercury. All listed parts are RoHS3 compliant.

Q: Which substitute part offers the best inventory availability?

A: SML4755AHE3_A/I offers the highest inventory availability with 8,459 pieces in stock, followed by SML4755AHE3_A/H with 2,802 pieces and SML4755A-E3/61 with 1,941 pieces.