SML4750HE3_A/I Zener Diode Equivalent & Substitute Parts

Part Overview

The SML4750HE3_A/I is a 27 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 AEC-Q101 automotive qualification and ROHS3 compliance. The part is supplied in Tape & Reel (TR) packaging with 784 pieces currently in stock.

Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and packaging options. Alternative part numbers provide flexibility in procurement, inventory availability, and packaging formats while maintaining functional equivalence within defined tolerance parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	27	V
Power - Maximum	1	W
Tolerance	±10%	—
Impedance (Maximum)	35	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 20.6 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 the SML4750HE3_A/I is determined by equivalence in the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Zener (Nominal): 27 V
Power - Maximum: 1 W
Impedance (Maximum): 35 Ohms
Current - Reverse Leakage @ Vr: 5 µA @ 20.6 V
Operating Temperature: 150°C

Mechanical Equivalence Criteria:

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

Compliance & Qualification:

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

Substitute parts are grouped into two categories based on tolerance specification:

Group 1 (±10% Tolerance): SML4750-E3/61 — Identical electrical and mechanical specifications with ±10% tolerance, supplied in Cut Tape (CT) packaging.

Group 2 (±5% Tolerance): SML4750A-E3/61 and SML4750AHE3_A/H — Enhanced tolerance specification (±5%) with identical electrical performance and mechanical compatibility. SML4750A-E3/61 is supplied in Cut Tape (CT) packaging. SML4750AHE3_A/H is supplied in Cut Tape (CT) & Digi-Reel® with Tape & Reel (TR) option and carries AEC-Q101 automotive qualification.

Parameter Comparison

Parameter	SML4750HE3_A/I (Main)	SML4750-E3/61	SML4750A-E3/61	SML4750AHE3_A/H
Voltage - Zener (Nom)	27 V	27 V	27 V	27 V
Tolerance	±10%	±10%	±5%	±5%
Power - Max	1 W	1 W	1 W	1 W
Impedance (Max)	35 Ohms	35 Ohms	35 Ohms	35 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 20.6 V	5 µA @ 20.6 V	5 µA @ 20.6 V	5 µA @ 20.6 V
Operating Temperature	150°C	150°C	150°C	150°C
Package / Case	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Grade	Automotive	—	—	Automotive
Qualification	AEC-Q101	—	—	AEC-Q101
Packaging Format	Tape & Reel (TR)	Cut Tape (CT)	Cut Tape (CT)	Cut Tape (CT) & Digi-Reel® / Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory (Pcs)	784	2320	5800	2036

Engineering Selection Recommendations

For Direct Functional Replacement (±10% Tolerance):

SML4750-E3/61 provides electrical and mechanical equivalence to the main part number with identical ±10% tolerance specification. This substitute is suitable for applications where tolerance specification is not a constraint. The part is active, ROHS3 compliant, and available in higher inventory (2320 pieces). The primary difference is packaging format: Cut Tape (CT) instead of Tape & Reel (TR).

For Enhanced Tolerance Applications (±5% Tolerance):

SML4750A-E3/61 and SML4750AHE3_A/H both provide tighter tolerance specification (±5%) while maintaining all other electrical and mechanical parameters. These parts are suitable for applications requiring improved voltage regulation accuracy.

SML4750A-E3/61 is supplied in Cut Tape (CT) format with the highest inventory availability (5800 pieces) and is active with ROHS3 compliance.

SML4750AHE3_A/H is supplied in both Cut Tape (CT) and Digi-Reel® / Tape & Reel (TR) formats, carries AEC-Q101 automotive qualification matching the main part, and is active with ROHS3 compliance. This part is recommended for automotive applications requiring both enhanced tolerance and formal qualification documentation.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited). SML4750AHE3_A/H is the only substitute carrying AEC-Q101 automotive qualification equivalent to the main part. For non-automotive applications, SML4750-E3/61 and SML4750A-E3/61 are functionally equivalent alternatives.

Frequently Asked Questions (FAQ)

Q: Can SML4750-E3/61 be used as a direct replacement for SML4750HE3_A/I?

A: Yes. SML4750-E3/61 is electrically and mechanically equivalent with identical 27 V nominal voltage, 1 W power rating, 35 Ohms maximum impedance, and DO-214AC (SMA) surface mount package. Both parts have ±10% tolerance. The primary difference is packaging format: SML4750-E3/61 is supplied in Cut Tape (CT) while SML4750HE3_A/I is supplied in Tape & Reel (TR).

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

A: Tolerance specification defines the acceptable deviation range from the nominal 27 V zener voltage. ±10% tolerance allows deviation from 24.3 V to 29.7 V. ±5% tolerance allows deviation from 25.65 V to 28.35 V. The ±5% variants (SML4750A-E3/61 and SML4750AHE3_A/H) provide tighter voltage regulation and are suitable for applications requiring improved accuracy.

Q: Is SML4750AHE3_A/H suitable for automotive applications?

A: Yes. SML4750AHE3_A/H carries AEC-Q101 automotive qualification and is graded as an automotive component, matching the qualification level of the main part SML4750HE3_A/I. Both parts are suitable for automotive circuit protection and voltage regulation applications.

Q: What packaging options are available for substitute parts?

A: SML4750-E3/61 and SML4750A-E3/61 are supplied in Cut Tape (CT) format. SML4750AHE3_A/H is supplied in both Cut Tape (CT) and Digi-Reel® / Tape & Reel (TR) formats. The main part SML4750HE3_A/I is supplied in Tape & Reel (TR) format.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts (SML4750-E3/61, SML4750A-E3/61, and SML4750AHE3_A/H) are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the compliance status of the main part.

Q: Which substitute part has the highest inventory availability?

A: SML4750A-E3/61 has the highest inventory with 5800 pieces in stock, followed by SML4750-E3/61 with 2320 pieces and SML4750AHE3_A/H with 2036 pieces. The main part SML4750HE3_A/I has 784 pieces in stock.

Q: Can I use a ±5% tolerance part in place of a ±10% tolerance part?

A: Yes. A ±5% tolerance part (SML4750A-E3/61 or SML4750AHE3_A/H) can be used in applications designed for ±10% tolerance parts. The tighter tolerance provides improved performance characteristics without compromising compatibility.

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