SML4755AHE3_A/I Zener Diode Equivalent & Substitute Parts

Part Overview

The SML4755AHE3_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. The part is used in voltage regulation and protection circuits where precise zener voltage and power dissipation characteristics are required. Substitute parts are identified based on matching electrical specifications, mechanical packaging, and compliance certifications to ensure direct functional equivalence in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	43	V
Tolerance	±5	%
Power - Maximum	1	W
Impedance (Maximum)	70	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 32.7 V
Operating Temperature	150	°C
Package / Case	DO-214AC (SMA)
Mounting Type	Surface Mount
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SML4755AHE3_A/I are determined by matching the following critical parameters:

Electrical Specifications:

Zener voltage: 43 V nominal
Tolerance: ±5%
Maximum power dissipation: 1 W
Maximum impedance: 70 Ohms
Reverse leakage current: 5 µA @ 32.7 V
Operating temperature: 150°C

Mechanical & Packaging Requirements:

Package type: DO-214AC (SMA)
Mounting type: Surface Mount
Tape & Reel packaging format

Compliance & Certification:

Automotive grade qualification (AEC-Q101)
ROHS3 compliance
Active product status

All identified substitute parts meet these parameters identically, ensuring functional equivalence for direct replacement in circuit designs.

Parameter Comparison

Parameter	SML4755AHE3_A/I	SML4755AHE3_A/H	SML4755A-E3/61
Voltage - Zener (Nominal)	43 V	43 V	43 V
Tolerance	±5%	±5%	±5%
Power - Maximum	1 W	1 W	1 W
Impedance (Maximum)	70 Ohms	70 Ohms	70 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 32.7 V	5 µA @ 32.7 V	5 µA @ 32.7 V
Operating Temperature	150°C	150°C	150°C
Package / Case	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Grade	Automotive	Automotive	Not specified
Qualification	AEC-Q101	AEC-Q101	Not specified
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory (Pcs)	8459	2802	1941

Engineering Selection Recommendations

SML4755AHE3_A/H: This part is a direct substitute with identical electrical and mechanical specifications. It carries automotive-grade qualification (AEC-Q101) and ROHS3 compliance matching the primary part. Selection of this variant is appropriate for applications requiring automotive-grade components with full compliance certification.

SML4755A-E3/61: This part matches all electrical specifications and mechanical packaging requirements. It is ROHS3 compliant and maintains the same zener voltage, power rating, and impedance characteristics. However, automotive-grade qualification and AEC-Q101 certification are not specified for this variant. This part is suitable for non-automotive applications or where automotive qualification is not a design requirement.

All three parts share the same base product number (SML4755) and are manufactured by Vishay General Semiconductor - Diodes Division, ensuring consistent quality and performance characteristics across the product family.

Frequently Asked Questions (FAQ)

Q: Can SML4755A-E3/61 be used in place of SML4755AHE3_A/I in automotive applications?

A: SML4755A-E3/61 matches all electrical and mechanical parameters but does not carry specified automotive-grade qualification or AEC-Q101 certification. Use in automotive applications depends on design requirements for these certifications.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts are supplied in Tape & Reel (TR) format with DO-214AC (SMA) surface mount package configuration, enabling direct replacement in automated assembly processes.

Q: What is the difference between the three part numbers if electrical specifications are identical?

A: The part numbers reflect different manufacturing date codes and tape reel configurations (indicated by the suffixes _A/I, _A/H, and -E3/61). Electrical and mechanical specifications remain identical across all variants.

Q: Is moisture sensitivity a concern for these components?

A: All parts carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Can these zener diodes be used interchangeably in existing circuit designs?

A: Yes, all substitute parts are parametrically equivalent and can be used as direct replacements without circuit modification, provided compliance requirements are met for the intended application.

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