SML4743HE3_A/I Zener Diode Equivalent & Substitute Parts

Part Overview

The SML4743HE3_A/I is a 13 V, 1 W Zener diode manufactured by Vishay General Semiconductor - Diodes Division in the DO-214AC (SMA) surface mount package. This component is classified as an active product with AEC-Q101 automotive qualification and ROHS3 compliance. The part is designed for voltage regulation and protection applications requiring a nominal Zener voltage of 13 V with ±10% tolerance. Substitute parts are identified when equivalent electrical and mechanical parameters are required for design flexibility, inventory management, or component availability across manufacturing batches.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	13	V
Tolerance	±10%	—
Power - Maximum	1	W
Impedance (Maximum)	10	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 9.9 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

Substitution of the SML4743HE3_A/I is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

Voltage - Zener (Nominal): 13 V
Power - Maximum: 1 W
Package / Case: DO-214AC (SMA)
Mounting Type: Surface Mount
Impedance (Maximum): 10 Ohms
Current - Reverse Leakage @ Vr: 5 µA @ 9.9 V
Operating Temperature: 150°C
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Variable Parameters Allowing Substitution:

Tolerance: ±10% (main part) to ±5% (substitute parts SML4743A-E3/61 and SML4743AHE3_A/H)
Grade and Qualification: Automotive with AEC-Q101 certification available in substitute SML4743AHE3_A/H

All identified substitute parts maintain the base product number SML4743 and share identical electrical performance specifications within the stated tolerance ranges. Tolerance tightening from ±10% to ±5% represents an improvement in voltage accuracy and does not restrict substitution.

Parameter Comparison

Parameter	SML4743HE3_A/I	SML4743-E3/61	SML4743A-E3/61	SML4743AHE3_A/H
Voltage - Zener (Nominal)	13 V	13 V	13 V	13 V
Tolerance	±10%	±10%	±5%	±5%
Power - Maximum	1 W	1 W	1 W	1 W
Impedance (Maximum)	10 Ohms	10 Ohms	10 Ohms	10 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 9.9 V	5 µA @ 9.9 V	5 µA @ 9.9 V	5 µA @ 9.9 V
Operating Temperature	150°C	150°C	150°C	150°C
Package / Case	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Grade	Automotive	—	—	Automotive
Qualification	AEC-Q101	—	—	AEC-Q101
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SML4743-E3/61: This substitute maintains identical electrical specifications and tolerance to the main part SML4743HE3_A/I. Both components carry ±10% Zener voltage tolerance and are ROHS3 compliant. Selection of SML4743-E3/61 is appropriate for applications where automotive qualification is not required. Inventory availability for this part is 2783 units.

SML4743A-E3/61: This substitute provides improved voltage accuracy with ±5% tolerance compared to the ±10% tolerance of the main part. All other electrical and mechanical parameters remain equivalent. This part does not carry automotive grade or AEC-Q101 qualification. Selection is appropriate for non-automotive applications requiring tighter voltage regulation. Inventory availability for this part is 18400 units.

SML4743AHE3_A/H: This substitute combines improved voltage accuracy (±5% tolerance) with automotive grade classification and AEC-Q101 qualification, matching the automotive credentials of the main part SML4743HE3_A/I. All electrical and mechanical parameters are equivalent. This part is suitable for direct replacement in automotive applications where enhanced voltage tolerance is beneficial. Inventory availability for this part is 1931 units.

All substitute parts are active products with ROHS3 compliance and MSL 1 rating. Selection among substitutes depends on application requirements for automotive qualification and voltage tolerance specifications.

Frequently Asked Questions (FAQ)

Q: Can SML4743-E3/61 be used as a direct replacement for SML4743HE3_A/I?

A: Yes. Both parts share identical electrical specifications including 13 V nominal Zener voltage, ±10% tolerance, 1 W maximum power, and DO-214AC surface mount packaging. The primary difference is the absence of automotive grade and AEC-Q101 qualification in SML4743-E3/61. Use this substitute only in non-automotive applications.

Q: What is the advantage of SML4743A-E3/61 over the main part?

A: SML4743A-E3/61 provides ±5% Zener voltage tolerance compared to ±10% in the main part, resulting in tighter voltage regulation. All other electrical parameters remain identical. This substitute is suitable for applications requiring improved voltage accuracy in non-automotive environments.

Q: Is SML4743AHE3_A/H suitable for automotive applications?

A: Yes. SML4743AHE3_A/H carries automotive grade classification and AEC-Q101 qualification, matching the main part SML4743HE3_A/I. Additionally, it provides ±5% voltage tolerance for improved accuracy. This part is fully qualified for automotive circuit protection and voltage regulation applications.

Q: Are all substitute parts in the same DO-214AC package?

A: Yes. All substitute parts use the DO-214AC (SMA) surface mount package with identical mechanical dimensions and land pattern compatibility. No PCB layout modifications are required when substituting between these parts.

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

A: Tolerance specifies the allowable deviation of the Zener voltage from the nominal 13 V specification. ±10% tolerance allows deviation from 11.7 V to 14.3 V. ±5% tolerance restricts deviation to 12.35 V to 13.65 V. Tighter tolerance (±5%) provides more precise voltage regulation.

Q: Can I use a ±5% tolerance part in a design specified for ±10% tolerance?

A: Yes. A ±5% tolerance part meets all requirements of a ±10% tolerance specification, as the tighter tolerance is a subset of the wider tolerance range. No design changes are required.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts, including SML4743-E3/61, SML4743A-E3/61, and SML4743AHE3_A/H, are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: Which substitute part has the highest inventory availability?

A: SML4743A-E3/61 has the highest inventory with 18400 units in stock, followed by SML4743-E3/61 with 2783 units and SML4743AHE3_A/H with 1931 units.

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