SML4757HE3_A/I Equivalent & Substitute Parts

Part Overview

The SML4757HE3_A/I is a 51 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 designed for voltage regulation and protection applications in electronic circuits. The part is supplied in Tape & Reel (TR) packaging format.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter set, allowing for design flexibility, inventory optimization, and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	51	V
Power - Maximum	1	W
Impedance (Maximum)	95	Ohms
Current - Reverse Leakage @ Vr	5 µA @ 38.8 V	µA
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 eligibility for the SML4757HE3_A/I is determined by the following critical parameters:

Electrical Parameters:

Zener voltage: 51 V nominal
Maximum power dissipation: 1 W
Maximum impedance: 95 Ohms
Reverse leakage current: 5 µA @ 38.8 V
Operating temperature: 150°C

Mechanical Parameters:

Package type: DO-214AC (SMA) surface mount
Mounting configuration: Surface mount

Compliance Parameters:

RoHS3 compliance
Moisture sensitivity level: 1 (Unlimited)

Substitute parts maintain identical electrical performance and mechanical compatibility. Tolerance variations (±10% versus ±5%) and packaging format differences (Tape & Reel versus Cut Tape) do not affect functional substitution but may influence procurement and assembly workflows.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Reverse Leakage	Operating Temp	Package	Packaging Format	Grade	AEC-Q101	Inventory
SML4757HE3_A/I	Vishay	51 V	±10%	1 W	95 Ω	5 µA @ 38.8 V	150°C	DO-214AC (SMA)	Tape & Reel (TR)	Automotive	Yes	1015 Pcs
SML4757-E3/61	Vishay	51 V	±10%	1 W	95 Ω	5 µA @ 38.8 V	150°C	DO-214AC (SMA)	Cut Tape (CT)	—	—	12300 Pcs
SML4757A-E3/61	Vishay	51 V	±5%	1 W	95 Ω	5 µA @ 38.8 V	150°C	DO-214AC (SMA)	Tape & Reel (TR)	—	—	27304 Pcs
SML4757AHE3_A/H	Vishay	51 V	±5%	1 W	95 Ω	5 µA @ 38.8 V	150°C	DO-214AC (SMA)	Tape & Reel (TR)	Automotive	Yes	2851 Pcs

Engineering Selection Recommendations

SML4757-E3/61 is a direct electrical equivalent with identical ±10% tolerance matching the main part specification. This substitute is supplied in Cut Tape (CT) format rather than Tape & Reel (TR). Selection of this part is appropriate when Cut Tape packaging is compatible with assembly processes and when higher inventory availability (12300 Pcs) is advantageous.

SML4757A-E3/61 provides improved tolerance performance at ±5% while maintaining all other electrical and mechanical specifications. This part is supplied in Tape & Reel (TR) format matching the main part packaging. The tighter tolerance specification supports applications requiring enhanced voltage regulation precision. Inventory availability is highest at 27304 Pcs.

SML4757AHE3_A/H combines automotive-grade qualification (AEC-Q101) with ±5% tolerance specification and Tape & Reel (TR) packaging. This part maintains full automotive compliance equivalent to the main part. Selection is appropriate for automotive applications where AEC-Q101 qualification is mandatory and tighter tolerance is beneficial.

All substitute parts maintain RoHS3 compliance, MSL Level 1 (Unlimited), and identical electrical performance within their specified tolerance bands.

Frequently Asked Questions (FAQ)

Q: Can SML4757-E3/61 replace SML4757HE3_A/I in automotive applications?

A: SML4757-E3/61 is electrically equivalent but lacks automotive-grade designation and AEC-Q101 qualification. Use only in non-automotive applications or where automotive qualification is not required.

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

A: Tolerance defines the acceptable deviation range from the nominal 51 V zener voltage. ±10% allows 45.9 V to 56.1 V; ±5% allows 48.45 V to 53.55 V. Tighter tolerance (±5%) provides more precise voltage regulation.

Q: Are Cut Tape (CT) and Tape & Reel (TR) formats functionally equivalent?

A: Yes. Both formats contain identical components. The difference is packaging and delivery method. Cut Tape is supplied in strips; Tape & Reel is supplied on continuous reels. Selection depends on assembly equipment compatibility and procurement workflow.

Q: Is SML4757AHE3_A/H suitable for automotive applications?

A: Yes. SML4757AHE3_A/H carries automotive-grade designation and AEC-Q101 qualification, making it suitable for automotive applications. It also provides ±5% tolerance for improved precision.

Q: Can I use SML4757A-E3/61 in place of SML4757HE3_A/I for automotive designs?

A: SML4757A-E3/61 is electrically equivalent with superior ±5% tolerance but lacks automotive-grade qualification and AEC-Q101 certification. For automotive applications requiring these qualifications, use SML4757AHE3_A/H instead.

Q: Do all substitute parts have the same reverse leakage current specification?

A: Yes. All listed substitutes maintain 5 µA @ 38.8 V reverse leakage current specification.

Q: What is the significance of the DO-214AC (SMA) package designation?

A: DO-214AC (SMA) is the standardized surface mount package type. All listed parts use this identical package, ensuring mechanical and thermal compatibility in PCB designs.

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