SML4745HE3_A/I Zener Diode Equivalent & Substitute Parts

Part Overview

The SML4745HE3_A/I is a 16 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 & Reel (TR) packaging with 8184 units in current inventory.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the same base product family (SML4745 series). Substitution becomes necessary when the primary part number reaches end-of-life status, inventory constraints occur, or alternative packaging formats are required for manufacturing processes.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	16	V
Power - Maximum	1	W
Tolerance	±10%	—
Impedance (Maximum)	16	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 12.2 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 within the SML4745 zener diode family is determined by three critical parameters: zener voltage (16 V), maximum power dissipation (1 W), and package type (DO-214AC/SMA). All substitute parts maintain these core electrical specifications.

Substitute parts are grouped into two tolerance categories:

±10% Tolerance Group: Parts maintaining the original ±10% tolerance specification include SML4745HE3_A/I and SML4745-E3/61. These parts are electrically and mechanically interchangeable with the main part number.

±5% Tolerance Group: Parts with tighter ±5% tolerance include SML4745AHE3_A/I, SML4745A-E3/61, and SML4745A-E3/5A. These parts provide improved voltage accuracy while maintaining identical zener voltage, power rating, impedance, reverse leakage current, and operating temperature specifications.

Packaging format variations (Tape & Reel versus Cut Tape) do not affect electrical performance and are selected based on manufacturing assembly requirements.

Parameter Comparison

Manufacturer Part Number	Voltage - Zener (Nom)	Tolerance	Power - Max	Impedance (Max)	Current - Reverse Leakage @ Vr	Operating Temperature	Package / Case	Packaging Format	Grade	Qualification	Inventory (Pcs)
SML4745HE3_A/I	16 V	±10%	1 W	16 Ohms	5 µA @ 12.2 V	150°C	DO-214AC (SMA)	Tape & Reel (TR)	Automotive	AEC-Q101	8184
SML4745-E3/61	16 V	±10%	1 W	16 Ohms	5 µA @ 12.2 V	150°C	DO-214AC (SMA)	Cut Tape (CT)	—	—	1324
SML4745AHE3_A/I	16 V	±5%	1 W	16 Ohms	5 µA @ 12.2 V	150°C	DO-214AC (SMA)	Tape & Reel (TR)	Automotive	AEC-Q101	7972
SML4745A-E3/61	16 V	±5%	1 W	16 Ohms	5 µA @ 12.2 V	150°C	DO-214AC (SMA)	Cut Tape (CT) & Digi-Reel®	—	—	1510
SML4745A-E3/5A	16 V	±5%	1 W	16 Ohms	5 µA @ 12.2 V	150°C	DO-214AC (SMA)	Cut Tape (CT) & Digi-Reel®	—	—	1350

Engineering Selection Recommendations

For Automotive Applications: SML4745HE3_A/I and SML4745AHE3_A/I are the primary selections. Both parts carry automotive-grade designation and AEC-Q101 qualification, meeting stringent automotive reliability and quality standards. SML4745AHE3_A/I provides tighter ±5% tolerance for applications requiring improved voltage accuracy.

For Standard Industrial Applications: SML4745-E3/61, SML4745A-E3/61, and SML4745A-E3/5A are suitable alternatives. These parts maintain identical electrical performance and DO-214AC package compatibility without automotive-grade certification.

For Packaging Constraints: Tape & Reel (TR) format is available in SML4745HE3_A/I and SML4745AHE3_A/I. Cut Tape (CT) format is available in SML4745-E3/61, SML4745A-E3/61, and SML4745A-E3/5A. Digi-Reel® packaging is available in SML4745A-E3/61 and SML4745A-E3/5A.

For Tolerance Requirements: Applications requiring ±10% tolerance accept SML4745HE3_A/I and SML4745-E3/61. Applications requiring ±5% tolerance require SML4745AHE3_A/I, SML4745A-E3/61, or SML4745A-E3/5A.

All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and identical electrical characteristics including 16 Ohms maximum impedance and 5 µA reverse leakage current at 12.2 V.

Frequently Asked Questions (FAQ)

Q: Can SML4745-E3/61 replace SML4745HE3_A/I in automotive applications?

A: SML4745-E3/61 maintains identical electrical specifications (16 V, 1 W, ±10% tolerance, DO-214AC package) but lacks automotive-grade designation and AEC-Q101 qualification. Use only in non-automotive applications or where automotive certification is not required.

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

A: Both tolerance groups maintain the same 16 V nominal zener voltage and identical electrical performance. The ±5% tolerance group (SML4745AHE3_A/I, SML4745A-E3/61, SML4745A-E3/5A) provides tighter voltage accuracy. Select ±5% parts for applications requiring improved voltage regulation precision.

Q: Are Tape & Reel and Cut Tape formats electrically equivalent?

A: Yes. Packaging format differences (Tape & Reel versus Cut Tape) do not affect electrical performance. Selection is based on manufacturing assembly equipment compatibility and handling requirements.

Q: Can I substitute SML4745A-E3/5A for SML4745HE3_A/I?

A: SML4745A-E3/5A is electrically compatible with identical zener voltage (16 V), power rating (1 W), impedance (16 Ohms), and package (DO-214AC). However, it features ±5% tolerance versus ±10%, and lacks automotive-grade certification. Substitution is valid for non-automotive applications or where improved tolerance is beneficial.

Q: What inventory levels are available for each substitute part?

A: Current inventory includes SML4745HE3_A/I (8184 pcs), SML4745AHE3_A/I (7972 pcs), SML4745A-E3/61 (1510 pcs), SML4745A-E3/5A (1350 pcs), and SML4745-E3/61 (1324 pcs).

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts in this substitution group are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating.

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