SML4740AHE3_A/I Zener Diode Equivalent & Substitute Parts

Part Overview

The SML4740AHE3_A/I is an active-status Zener diode manufactured by Vishay General Semiconductor - Diodes Division. This component is a 10 V, 1 W surface mount device in DO-214AC (SMA) packaging with automotive-grade qualification (AEC-Q101). The part is ROHS3 compliant and carries unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained within the allowed specifications for this product category. Substitution becomes necessary due to inventory availability, supply chain optimization, or design flexibility requirements while maintaining functional equivalence.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	10	V
Tolerance	±10%	—
Power - Maximum	1	W
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	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of Zener diodes within this product category is determined by strict equivalence across the following parameters:

Critical 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

Critical Mechanical Parameters:

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

Compliance & Certification Parameters:

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

Tolerance Consideration: Tolerance specifications (±10% or ±5%) are listed as distinct parameters. Parts with ±10% tolerance are directly equivalent to the main part. Parts with ±5% tolerance represent tighter tolerance variants and are functionally compatible for applications where the main part's ±10% tolerance is acceptable.

All substitute parts listed maintain identical electrical performance within their specified tolerance bands and are qualified for equivalent applications.

Parameter Comparison

Manufacturer Part Number	Voltage - Zener (Nom)	Tolerance	Power - Max	Impedance (Max)	Current - Reverse Leakage @ Vr	Operating Temperature	Package / Case	Grade	Qualification	Inventory (Pcs)
SML4740AHE3_A/I	10 V	±10%	1 W	7 Ohms	10 µA @ 7.6 V	150°C	DO-214AC (SMA)	Automotive	AEC-Q101	1059
SML4740-E3/5A	10 V	±10%	1 W	7 Ohms	10 µA @ 7.6 V	150°C	DO-214AC (SMA)	—	—	7021
SML4740-E3/61	10 V	±10%	1 W	7 Ohms	10 µA @ 7.6 V	150°C	DO-214AC (SMA)	—	—	4343
SML4740A-E3/61	10 V	±5%	1 W	7 Ohms	10 µA @ 7.6 V	150°C	DO-214AC (SMA)	—	—	18300
SML4740AHE3_A/H	10 V	±10%	1 W	7 Ohms	10 µA @ 7.6 V	150°C	DO-214AC (SMA)	Automotive	AEC-Q101	2798

Engineering Selection Recommendations

For Automotive Applications with AEC-Q101 Requirement:

The SML4740AHE3_A/H is a direct substitute for the SML4740AHE3_A/I. Both parts carry automotive-grade designation and AEC-Q101 qualification. Selection between these two parts is based on inventory availability and supply chain requirements. The SML4740AHE3_A/H maintains 2798 units in stock compared to 1059 units for the main part.

For General-Purpose Applications:

The SML4740-E3/5A and SML4740-E3/61 are parametric equivalents with identical electrical specifications and DO-214AC (SMA) packaging. These parts do not carry automotive-grade designation or AEC-Q101 qualification. Selection is appropriate for non-automotive applications where automotive qualification is not required. The SML4740-E3/5A provides 7021 units in stock, and the SML4740-E3/61 provides 4343 units.

For Tighter Tolerance Requirements:

The SML4740A-E3/61 offers ±5% tolerance compared to the ±10% tolerance of the main part. This part is suitable for applications requiring improved voltage accuracy. With 18300 units in stock, it provides the highest inventory availability. This part does not carry automotive-grade designation or AEC-Q101 qualification.

Compliance Consistency:

All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and active product status. Selection should prioritize automotive-grade and AEC-Q101 qualified variants for automotive applications and non-qualified variants for general-purpose applications.

Frequently Asked Questions (FAQ)

Q: Can SML4740-E3/5A be used as a direct replacement for SML4740AHE3_A/I in automotive applications?

A: The SML4740-E3/5A is electrically equivalent but does not carry automotive-grade designation or AEC-Q101 qualification. Use in automotive applications is not recommended. For automotive applications, use SML4740AHE3_A/H, which maintains both automotive grade and AEC-Q101 qualification.

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

A: The primary difference is tolerance specification. SML4740A-E3/61 offers ±5% tolerance, while SML4740-E3/61 offers ±10% tolerance. Both parts are electrically and mechanically equivalent in all other parameters. Selection depends on application requirements for voltage accuracy.

Q: Are all substitute parts in DO-214AC (SMA) packaging?

A: Yes. All listed substitute parts use DO-214AC (SMA) surface mount packaging. Package equivalence is maintained across all substitutes, ensuring compatibility with existing PCB layouts and assembly processes.

Q: Can SML4740AHE3_A/H replace SML4740AHE3_A/I without design changes?

A: Yes. Both parts are automotive-grade, AEC-Q101 qualified, and maintain identical electrical and mechanical specifications. Substitution requires no design changes or re-qualification.

Q: Which substitute part has the highest inventory availability?

A: SML4740A-E3/61 maintains the highest inventory with 18300 units in stock. This part offers ±5% tolerance and is suitable for applications where tighter voltage tolerance is beneficial and automotive qualification is not required.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), consistent with the main part specification.

Q: What is the significance of the part number suffix differences (e.g., -E3/5A, -E3/61, AHE3_A/H)?

A: Part number suffixes indicate manufacturing code, tape reel configuration, or qualification level. These designations do not affect electrical or mechanical performance within the specified parameter ranges. Suffixes are used for supply chain and traceability purposes.

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