SML4740HE3_A/I Zener Diode Equivalent & Substitute Parts

Part Overview

The SML4740HE3_A/I is a 10 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 available in tape and reel packaging with 1053 units currently in stock.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter set. Alternative part numbers may be required due to inventory availability, supply chain considerations, or specific packaging requirements while maintaining functional equivalence.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	10	V
Power - Maximum	1	W
Tolerance	±10%	—
Impedance (Maximum)	7	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 7.6 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 eligibility for the SML4740HE3_A/I is determined by the following critical parameters:

Electrical Parameters:

Voltage - Zener (Nominal): 10 V
Power - Maximum: 1 W
Impedance (Maximum): 7 Ohms
Current - Reverse Leakage @ Vr: 10 µA @ 7.6 V
Operating Temperature: 150°C

Mechanical Parameters:

Package / Case: DO-214AC (SMA)
Mounting Type: Surface Mount

Compliance Parameters:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts listed maintain identical electrical specifications and mechanical compatibility. Tolerance variations (±10% versus ±5%) represent tighter specification grades within the same base product family and do not preclude substitution. Automotive-grade qualification (AEC-Q101) is present on the main part and certain substitute options, indicating enhanced reliability screening for automotive applications.

Parameter Comparison

Manufacturer Part Number	Voltage - Zener (Nom)	Power - Max	Tolerance	Impedance (Max)	Current - Reverse Leakage @ Vr	Operating Temperature	Package / Case	Automotive Grade	Inventory (Pcs)
SML4740HE3_A/I	10 V	1 W	±10%	7 Ohms	10 µA @ 7.6 V	150°C	DO-214AC (SMA)	Yes (AEC-Q101)	1053
SML4740-E3/5A	10 V	1 W	±10%	7 Ohms	10 µA @ 7.6 V	150°C	DO-214AC (SMA)	No	7021
SML4740-E3/61	10 V	1 W	±10%	7 Ohms	10 µA @ 7.6 V	150°C	DO-214AC (SMA)	No	4343
SML4740A-E3/61	10 V	1 W	±5%	7 Ohms	10 µA @ 7.6 V	150°C	DO-214AC (SMA)	No	18300
SML4740AHE3_A/H	10 V	1 W	±10%	7 Ohms	10 µA @ 7.6 V	150°C	DO-214AC (SMA)	Yes (AEC-Q101)	2798

Engineering Selection Recommendations

For Automotive Applications: When AEC-Q101 automotive qualification is required, select from SML4740HE3_A/I or SML4740AHE3_A/H. Both parts carry automotive-grade designation and meet the same electrical and mechanical specifications. SML4740AHE3_A/H offers higher inventory availability (2798 units) compared to the main part (1053 units).

For Standard Industrial Applications: SML4740-E3/5A, SML4740-E3/61, and SML4740A-E3/61 are suitable for non-automotive applications. All three maintain identical electrical performance and DO-214AC package compatibility. SML4740A-E3/61 provides the tightest tolerance specification (±5%) with the highest inventory level (18300 units), making it optimal for applications requiring enhanced voltage accuracy.

For General Substitution: All listed parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Selection among equivalent parts should prioritize inventory availability and tolerance requirements specific to the application circuit design.

Frequently Asked Questions (FAQ)

Q: Can SML4740-E3/5A be used as a direct replacement for SML4740HE3_A/I?

A: Yes. Both parts share identical electrical parameters (10 V nominal, 1 W power rating, ±10% tolerance, 7 Ohms maximum impedance) and the same DO-214AC surface mount package. The primary difference is the absence of automotive-grade qualification on SML4740-E3/5A. For non-automotive applications, this part is functionally equivalent.

Q: What is the difference between SML4740A-E3/61 and SML4740-E3/61?

A: The tolerance specification differs. SML4740A-E3/61 provides ±5% tolerance, while SML4740-E3/61 provides ±10% tolerance. Both maintain identical power rating, impedance, and package specifications. Selection depends on the voltage accuracy requirement of the circuit design.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed parts, including the main part SML4740HE3_A/I and all substitute options, are RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Q: Can SML4740AHE3_A/H replace SML4740HE3_A/I in automotive applications?

A: Yes. SML4740AHE3_A/H carries AEC-Q101 automotive qualification identical to SML4740HE3_A/I and maintains all electrical and mechanical specifications. This part is a direct functional equivalent for automotive-grade applications.

Q: What packaging format is used for all listed parts?

A: All parts are supplied in tape and reel (TR) format with DO-214AC (SMA) surface mount package configuration. This packaging is standard for automated assembly processes.

Q: Is the 10 V zener voltage specification maintained across all substitute parts?

A: Yes. All substitute parts maintain a nominal zener voltage of 10 V. Tolerance variations (±10% or ±5%) define the acceptable voltage range around this nominal value but do not change the core 10 V specification.

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