SML4739AHE3_A/I Zener Diode Equivalent & Substitute Parts

Part Overview

The SML4739AHE3_A/I is a 9.1 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 automotive-grade qualification (AEC-Q101) and is ROHS3 compliant. The part is supplied in Tape & Reel packaging with 940 pieces currently in stock.

Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage applications. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility to ensure direct interchangeability in circuit designs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	9.1	V
Tolerance	±5%	%
Power - Maximum	1	W
Impedance (Maximum)	5	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 7 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 is determined by strict equivalence of electrical and mechanical parameters. The following criteria establish direct interchangeability:

Critical Substitution Parameters:

Zener voltage (Vz): 9.1 V nominal
Tolerance: ±5%
Maximum power dissipation: 1 W
Maximum impedance (Zzt): 5 Ohms
Reverse leakage current: 10 µA @ 7 V
Operating temperature: 150°C maximum
Package type: DO-214AC (SMA) surface mount
RoHS compliance: ROHS3 Compliant
Moisture sensitivity: MSL 1

All substitute parts listed below meet these electrical and mechanical specifications. Variations in packaging format (Tape & Reel versus Cut Tape) do not affect electrical performance and represent logistical alternatives for procurement and assembly processes.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Leakage @ Vr (µA)	Temp (°C)	Package	Packaging Format	Inventory (Pcs)
SML4739AHE3_A/I	Vishay	9.1	±5%	1	5	10 @ 7 V	150	DO-214AC (SMA)	Tape & Reel	940
SML4739AHE3_A/H	Vishay	9.1	±5%	1	5	10 @ 7 V	150	DO-214AC (SMA)	Tape & Reel	2831
SML4739A-E3/5A	Vishay	9.1	±5%	1	5	10 @ 7 V	150	DO-214AC (SMA)	Tape & Reel	1027
SML4739A-E3/61	Vishay	9.1	±5%	1	5	10 @ 7 V	150	DO-214AC (SMA)	Cut Tape	8400

Engineering Selection Recommendations

All substitute parts listed are manufactured by Vishay General Semiconductor - Diodes Division and maintain identical electrical specifications to the primary part SML4739AHE3_A/I. Selection among these equivalents is based on the following factors:

Compliance and Certification: The SML4739AHE3_A/I and SML4739AHE3_A/H both carry automotive-grade qualification (AEC-Q101), making them suitable for applications requiring automotive component standards. The SML4739A-E3/5A and SML4739A-E3/61 are standard industrial-grade equivalents without automotive qualification.

Packaging Format: SML4739AHE3_A/I, SML4739AHE3_A/H, and SML4739A-E3/5A are supplied in Tape & Reel format, suitable for automated pick-and-place assembly. SML4739A-E3/61 is supplied in Cut Tape format, appropriate for manual assembly or lower-volume production runs.

Inventory Availability: SML4739A-E3/61 offers the highest inventory level at 8400 pieces. SML4739AHE3_A/H provides 2831 pieces. SML4739A-E3/5A provides 1027 pieces. SML4739AHE3_A/I provides 940 pieces.

Product Status: All parts maintain active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can SML4739A-E3/61 (Cut Tape) be used as a direct substitute for SML4739AHE3_A/I (Tape & Reel)?

A: Yes. The packaging format difference (Cut Tape versus Tape & Reel) is a logistical distinction only. Both formats contain identical components with matching electrical specifications. The choice between formats depends on assembly process requirements and production volume.

Q: What is the difference between automotive-grade (SML4739AHE3_A/I, SML4739AHE3_A/H) and industrial-grade (SML4739A-E3/5A, SML4739A-E3/61) versions?

A: Automotive-grade parts carry AEC-Q101 qualification, indicating compliance with automotive industry reliability and testing standards. Industrial-grade parts do not carry this certification. Selection depends on application requirements. Automotive applications require automotive-grade parts; general industrial applications accept either grade.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level).

Q: Do the substitute parts have identical electrical performance?

A: Yes. All substitute parts share identical electrical specifications: 9.1 V nominal Zener voltage, ±5% tolerance, 1 W maximum power, 5 Ohms maximum impedance, 10 µA reverse leakage current at 7 V, and 150°C maximum operating temperature.

Q: Which substitute part should be selected for high-volume automated assembly?

A: SML4739AHE3_A/I, SML4739AHE3_A/H, or SML4739A-E3/5A are all supplied in Tape & Reel format suitable for automated pick-and-place assembly. Selection among these three depends on automotive qualification requirements and inventory availability.

Q: Can these Zener diodes be used interchangeably in existing circuit designs?

A: Yes. All substitute parts maintain identical electrical characteristics and the same DO-214AC (SMA) package footprint, enabling direct substitution in existing PCB designs without circuit modification.

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