SML4752HE3_A/I Equivalent & Substitute Parts

Part Overview

The SML4752HE3_A/I is a Zener diode rated at 33 V, 1 W, manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component in DO-214AC (SMA) package is designed for voltage regulation and protection applications. The part is Active in product status and carries automotive-grade qualification (AEC-Q101). Substitute parts are necessary to address inventory availability, tolerance requirements, or specific packaging designations while maintaining electrical and mechanical compatibility within the same product family.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	33	V
Power - Maximum	1	W
Tolerance	±10%	—
Impedance (Maximum)	45	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 25.1 V
Operating Temperature	150	°C
Package / Case	DO-214AC (SMA)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of Zener diodes within this product family is determined by the following critical parameters: nominal Zener voltage (33 V), maximum power dissipation (1 W), package type (DO-214AC/SMA), and surface mount configuration. All substitute parts maintain these core electrical and mechanical specifications.

The substitute parts are grouped into two tolerance classifications:

±10% Tolerance Group: Parts with ±10% voltage tolerance are directly interchangeable with the main part SML4752HE3_A/I.

±5% Tolerance Group: Parts with ±5% voltage tolerance offer tighter tolerance specifications and are suitable for applications requiring improved voltage accuracy. These parts maintain all other electrical parameters identically.

All substitute parts share the same base product number (SML4752), reverse leakage current specification (5 µA @ 25.1 V), impedance rating (45 Ohms maximum), and operating temperature limit (150°C). Packaging designation and supplier device package remain consistent across all variants.

Parameter Comparison

Manufacturer Part Number	Voltage - Zener (Nom)	Tolerance	Power - Max	Impedance (Max)	Current - Reverse Leakage @ Vr	Operating Temperature	Package / Case	Mounting Type	Grade	Qualification	RoHS Status	Inventory (Pcs)
SML4752HE3_A/I	33 V	±10%	1 W	45 Ohms	5 µA @ 25.1 V	150°C	DO-214AC (SMA)	Surface Mount	Automotive	AEC-Q101	ROHS3 Compliant	800
SML4752-E3/61	33 V	±10%	1 W	45 Ohms	5 µA @ 25.1 V	150°C	DO-214AC (SMA)	Surface Mount	—	—	ROHS3 Compliant	2053
SML4752A-E3/61	33 V	±5%	1 W	45 Ohms	5 µA @ 25.1 V	150°C	DO-214AC (SMA)	Surface Mount	—	—	ROHS3 Compliant	1704
SML4752AHE3_A/H	33 V	±5%	1 W	45 Ohms	5 µA @ 25.1 V	150°C	DO-214AC (SMA)	Surface Mount	Automotive	AEC-Q101	ROHS3 Compliant	2504

Engineering Selection Recommendations

For Direct Replacement (±10% Tolerance): SML4752-E3/61 is a parametric equivalent with identical electrical specifications and ±10% tolerance matching the main part SML4752HE3_A/I. This part is suitable for applications where the original tolerance specification is required. Both parts are Active in product status and ROHS3 compliant.

For Improved Tolerance (±5% Tolerance): SML4752A-E3/61 and SML4752AHE3_A/H both provide ±5% voltage tolerance, offering tighter voltage regulation compared to the ±10% specification of the main part. These parts maintain all other electrical parameters identically. SML4752AHE3_A/H carries automotive-grade qualification (AEC-Q101), matching the qualification level of the main part SML4752HE3_A/I.

Automotive Applications: For applications requiring automotive-grade components with AEC-Q101 qualification, SML4752AHE3_A/H is the appropriate substitute, offering both improved tolerance (±5%) and maintained automotive qualification.

All substitute parts are Active in product status, ROHS3 compliant, and feature Moisture Sensitivity Level 1 (Unlimited), ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can SML4752-E3/61 replace SML4752HE3_A/I directly? A: Yes. Both parts share identical electrical specifications: 33 V nominal Zener voltage, ±10% tolerance, 1 W maximum power, 45 Ohms maximum impedance, and DO-214AC (SMA) surface mount package. The parts are parametric equivalents.

Q: What is the difference between ±10% and ±5% tolerance variants? A: Tolerance specifies the allowable deviation from the nominal 33 V Zener voltage. ±10% tolerance allows deviation from 29.7 V to 36.3 V, while ±5% tolerance restricts deviation to 31.35 V to 34.65 V. The ±5% variants (SML4752A-E3/61 and SML4752AHE3_A/H) provide tighter voltage regulation.

Q: Is SML4752AHE3_A/H suitable for automotive applications? A: Yes. SML4752AHE3_A/H carries automotive-grade designation and AEC-Q101 qualification, meeting automotive industry standards. It is suitable for automotive applications requiring improved tolerance (±5%) and automotive qualification.

Q: Are all substitute parts in the same DO-214AC (SMA) package? A: Yes. All substitute parts use the DO-214AC (SMA) surface mount package, ensuring mechanical and footprint compatibility with the main part SML4752HE3_A/I.

Q: Do all parts meet RoHS compliance? A: Yes. All parts listed are ROHS3 compliant and feature Moisture Sensitivity Level 1 (Unlimited), meeting environmental and manufacturing standards.

Q: What is the inventory status of substitute parts? A: SML4752-E3/61 has 2053 pieces in stock, SML4752A-E3/61 has 1704 pieces in stock, and SML4752AHE3_A/H has 2504 pieces in stock. The main part SML4752HE3_A/I has 800 pieces in stock.

Q: Can I use a ±5% tolerance part in place of a ±10% tolerance specification? A: Yes. A ±5% tolerance part meets a ±10% tolerance requirement, as the tighter tolerance is a subset of the broader specification. However, application-specific requirements should be verified.

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