SML4753HE3_A/I Equivalent & Substitute Parts

Part Overview

The SML4753HE3_A/I is a Zener diode rated at 36 V, 1 W, housed in a DO-214AC (SMA) surface mount package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as an automotive-grade device with AEC-Q101 qualification. The part is currently active in production with 702 pieces in stock. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and compliance certifications to support design flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	36 V
Power - Max	1 W
Impedance (Max)	50 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 27.4 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 the SML4753HE3_A/I is determined by the following critical parameters:

Electrical Specifications:

Zener voltage: 36 V (nominal)
Maximum power dissipation: 1 W
Impedance (maximum): 50 Ohms
Reverse leakage current: 5 µA @ 27.4 V
Operating temperature: 150°C

Package and Mounting:

Package type: DO-214AC (SMA)
Mounting configuration: Surface Mount

Compliance and Certification:

RoHS3 compliance
Moisture Sensitivity Level 1
Automotive grade with AEC-Q101 qualification (where applicable)

Substitute parts must match all electrical parameters, maintain identical package specifications, and preserve compliance certifications. Tolerance variations are permitted within the specified ranges for each part.

Parameter Comparison

Parameter	SML4753HE3_A/I	SML4753A-E3/61	SML4753AHE3_A/H
Voltage - Zener (Nom)	36 V	36 V	36 V
Tolerance	±10%	±5%	±5%
Power - Max	1 W	1 W	1 W
Impedance (Max)	50 Ohms	50 Ohms	50 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 27.4 V	5 µA @ 27.4 V	5 µA @ 27.4 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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Grade	Automotive	Not specified	Automotive
Qualification	AEC-Q101	Not specified	AEC-Q101
Inventory (Pcs)	702	7300	2814

Engineering Selection Recommendations

SML4753A-E3/61 is a parametric equivalent with tighter tolerance (±5% versus ±10%) and higher inventory availability (7300 pieces). This part maintains all electrical specifications and package requirements. However, automotive-grade certification and AEC-Q101 qualification are not specified for this variant. Selection of this part is appropriate for applications where automotive qualification is not a requirement.

SML4753AHE3_A/H is a direct equivalent with tighter tolerance (±5% versus ±10%), automotive-grade classification, and AEC-Q101 qualification matching the original part. This variant is suitable for automotive applications and provides improved tolerance performance. Inventory availability is 2814 pieces.

For applications requiring automotive-grade components with AEC-Q101 certification, SML4753AHE3_A/H is the preferred substitute. For non-automotive applications where tighter tolerance is beneficial, SML4753A-E3/61 is suitable. All three parts are ROHS3 compliant and maintain identical electrical performance within their respective tolerance bands.

Frequently Asked Questions (FAQ)

Q: Can SML4753A-E3/61 be used as a direct replacement for SML4753HE3_A/I in automotive applications?

A: SML4753A-E3/61 matches all electrical specifications and package requirements. However, automotive-grade certification and AEC-Q101 qualification are not specified for this part. For automotive applications requiring these certifications, SML4753AHE3_A/H is the appropriate substitute.

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

A: Tolerance specifies the allowable deviation of the Zener voltage from the nominal 36 V rating. ±10% tolerance allows deviation between 32.4 V and 39.6 V, while ±5% tolerance restricts deviation to 34.2 V and 37.8 V. Tighter tolerance (±5%) provides more precise voltage regulation.

Q: Are all three parts identical in package and mounting?

A: Yes. SML4753HE3_A/I, SML4753A-E3/61, and SML4753AHE3_A/H all use the DO-214AC (SMA) surface mount package with identical physical dimensions and PCB footprint compatibility.

Q: Which substitute part has the best availability?

A: SML4753A-E3/61 has the highest inventory with 7300 pieces in stock, compared to 2814 pieces for SML4753AHE3_A/H and 702 pieces for the original SML4753HE3_A/I.

Q: Do all parts comply with RoHS3 and REACH requirements?

A: Yes. All three parts are ROHS3 compliant, REACH unaffected, and carry Moisture Sensitivity Level 1 (unlimited shelf life).

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

A: AEC-Q101 is an automotive electronics qualification standard. Parts bearing this qualification have undergone rigorous testing for reliability and performance in automotive environments. SML4753HE3_A/I and SML4753AHE3_A/H carry this qualification; SML4753A-E3/61 does not.

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