SML4758HE3_A/I Equivalent & Substitute Parts Reference (Zener Diodes)

Part Overview

The SML4758HE3_A/I is a Zener diode from Vishay General Semiconductor - Diodes Division. It is packaged in a DO-214AC (SMA) surface-mount package, providing 56 V nominal Zener voltage, 1 W maximum power dissipation, and ±10% tolerance. The part is qualified for automotive applications (AEC-Q101) and is compliant with ROHS3. This Zener diode is actively manufactured; however, sourcing alternative models is essential for supply chain reliability, multi-source requirements, and risk mitigation.

Substiute Parts

SML4758HE3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1180SML4758HE3_A/I Datasheet

Current PartRFQ

1SMA4758-GT3

SMC Diode SolutionsIn Stock: 1394001SMA4758-GT3 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution is based strictly on matching the following parameters:

• Zener voltage (56 V nominal)
• Power rating (1 W maximum)
• Maximum impedance (110 Ohms)
• Maximum reverse leakage current (5 µA @ 42.6 V)
• Surface-mount package (DO-214AC/SMA)
• Qualified operating temperature range (–65°C to 150°C)
• RoHS compliance and MSL equivalence

Any substitute Zener diode must adhere to these parameters for functional equivalence and direct footprint compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both SML4758HE3_A/I and 1SMA4758-GT3 are active components, surface-mount Zener diodes with 56 V Zener voltage and 1 W maximum power dissipation in identical package types (DO-214AC/SMA). These parts share the same impedance, leakage current, and operating temperature ranges. Both are ROHS3 compliant and have an unlimited moisture sensitivity level. REACH status differs (unaffected vs. affected) and should be considered as per environmental compliance requirements.

Frequently Asked Questions (FAQ)

Q1: What criteria are used when substituting SML4758HE3_A/I with another Zener diode?
A: Substitution requires identical parameters for Zener voltage, power rating, impedance, reverse leakage, package type, mounting type, operating temperature range, and compliance levels.

Q2: Is 1SMA4758-GT3 footprint-compatible with SML4758HE3_A/I?
A: Yes, both are supplied in DO-214AC (SMA) surface-mount packages.

Q3: How does tolerance affect the equivalence of these Zener diode substitutes?
A: Both Zener diodes have tolerances within ±10% or tighter. 1SMA4758-GT3 is ±5%, which is within the upper limit of SML4758HE3_A/I's ±10%.

Q4: Are there differences in environmental compliance between the main and substitute part?
A: While both are ROHS3 compliant, SML4758HE3_A/I is REACH unaffected, and 1SMA4758-GT3 is REACH affected. Selection should align with required regulatory documentation.

Q5: Are the electrical and mechanical characteristics sufficient for direct substitution without modification to the PCB layout?
A: Yes, both parts share mounting type and case outline (DO-214AC/SMA), supporting direct replacement based on the provided parameters.