SML4739HE3_A/I Zener Diode Equivalent & Substitute Parts

Part Overview

The SML4739HE3_A/I is a 9.1 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 supplied in Tape & Reel (TR) packaging with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or specific packaging format needs while maintaining identical or enhanced electrical performance characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	9.1	V
Power - Maximum	1	W
Tolerance	±10%	—
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	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SML4739HE3_A/I is determined by the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage: 9.1 V nominal
Maximum power dissipation: 1 W
Package type: DO-214AC (SMA)
Mounting configuration: Surface Mount
Operating temperature range: 150°C maximum
Reverse leakage current: 10 µA @ 7 V
Maximum impedance: 5 Ohms

Tolerance Variations: Substitute parts are grouped into two tolerance classes: ±10% tolerance (matching the main part specification) and ±5% tolerance (tighter specification). Parts with ±5% tolerance are electrically superior and directly substitutable for ±10% applications.

Packaging Format Variations: Substitute parts are available in two packaging formats: Tape & Reel (TR) for automated assembly and Cut Tape (CT) for manual or semi-automated processes. Both formats contain identical die and electrical characteristics.

Compliance and Qualification: All substitute parts maintain RoHS3 compliance, MSL 1 rating, and REACH unaffected status. Automotive-grade variants with AEC-Q101 qualification are available and directly substitutable for both automotive and general-purpose applications.

Parameter Comparison

Part Number	Manufacturer	Vz (Nominal)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Temp (Max)	Package	Packaging Format	Grade	Inventory (Pcs)
SML4739HE3_A/I	Vishay	9.1 V	±10%	1 W	5 Ω	10 µA @ 7 V	150°C	DO-214AC (SMA)	Tape & Reel (TR)	Automotive	1,123
SML4739-E3/61	Vishay	9.1 V	±10%	1 W	5 Ω	10 µA @ 7 V	150°C	DO-214AC (SMA)	Tape & Reel (TR)	General Purpose	39,900
SML4739A-E3/5A	Vishay	9.1 V	±5%	1 W	5 Ω	10 µA @ 7 V	150°C	DO-214AC (SMA)	Tape & Reel (TR)	General Purpose	1,027
SML4739A-E3/61	Vishay	9.1 V	±5%	1 W	5 Ω	10 µA @ 7 V	150°C	DO-214AC (SMA)	Cut Tape (CT)	General Purpose	8,400
SML4739AHE3_A/H	Vishay	9.1 V	±5%	1 W	5 Ω	10 µA @ 7 V	150°C	DO-214AC (SMA)	Tape & Reel (TR)	Automotive	2,831

Engineering Selection Recommendations

Direct Substitution (Identical Electrical and Mechanical Specifications):

SML4739-E3/61 is a direct parametric equivalent to SML4739HE3_A/I with identical electrical characteristics and packaging format. This part is suitable for applications where automotive qualification is not required. The significantly higher inventory level (39,900 units) provides superior supply chain availability.

Enhanced Tolerance Substitution:

SML4739A-E3/5A and SML4739AHE3_A/H both feature ±5% tolerance, providing tighter voltage regulation compared to the ±10% specification of the main part. These parts are electrically superior and directly substitutable in all applications requiring the SML4739HE3_A/I. SML4739AHE3_A/H maintains automotive-grade qualification and AEC-Q101 certification, making it the preferred substitute for automotive applications requiring enhanced tolerance performance.

Packaging Format Consideration:

SML4739A-E3/61 is supplied in Cut Tape (CT) format rather than Tape & Reel (TR). This variant is suitable for manual assembly, rework operations, or low-volume production environments where automated tape feeding is not required.

Compliance Status:

All substitute parts maintain RoHS3 compliance, MSL 1 rating, and REACH unaffected status, ensuring regulatory equivalence with the main part across all jurisdictions.

Frequently Asked Questions (FAQ)

Q: Can SML4739-E3/61 be used as a direct replacement for SML4739HE3_A/I?

A: Yes. SML4739-E3/61 is a parametric equivalent with identical electrical specifications (9.1 V nominal, 1 W power rating, ±10% tolerance) and mechanical packaging (DO-214AC SMA, Surface Mount). Both parts are supplied in Tape & Reel format. The primary difference is the absence of automotive-grade qualification on SML4739-E3/61, which is acceptable for non-automotive applications.

Q: What is the advantage of using SML4739A-E3/5A or SML4739AHE3_A/H?

A: Both parts feature ±5% tolerance compared to the ±10% tolerance of the main part, providing tighter voltage regulation and improved circuit performance. These parts are electrically superior and directly substitutable in all applications. SML4739AHE3_A/H additionally maintains automotive-grade qualification for applications requiring AEC-Q101 compliance.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Tape & Reel (TR) packaging is configured for automated pick-and-place assembly equipment with continuous reel feeding. Cut Tape (CT) packaging provides individual component segments suitable for manual assembly, rework operations, or semi-automated processes. Both formats contain identical components with identical electrical characteristics.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (SML4739-E3/61, SML4739A-E3/5A, SML4739A-E3/61, and SML4739AHE3_A/H) are RoHS3 compliant with MSL 1 rating and REACH unaffected status, ensuring regulatory equivalence with the main part.

Q: Can I use a general-purpose grade part in an automotive application?

A: General-purpose grade parts (SML4739-E3/61, SML4739A-E3/5A, SML4739A-E3/61) lack automotive-grade qualification and AEC-Q101 certification. For automotive applications requiring these qualifications, use SML4739AHE3_A/H, which maintains both automotive grade and AEC-Q101 qualification while providing enhanced ±5% tolerance performance.

Q: Which substitute part offers the best supply chain availability?

A: SML4739-E3/61 provides the highest inventory level at 39,900 units, offering superior supply chain availability compared to the main part (1,123 units) and other substitutes.

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