SML4757AHE3_A/I Zener Diode Equivalent & Substitute Parts

Part Overview

The SML4757AHE3_A/I is a 51 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. Substitute parts are identified when equivalent electrical specifications and mechanical packaging requirements are met, enabling seamless integration into existing circuit designs without performance degradation.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	51	V
Tolerance	±5	%
Power - Maximum	1	W
Impedance (Maximum)	95	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 38.8 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

Substitute parts for the SML4757AHE3_A/I are identified based on strict electrical and mechanical parameter equivalence. The substitution criteria are:

Primary Equivalence Parameters:

Voltage - Zener (Nominal): 51 V
Power - Maximum: 1 W
Tolerance: ±5%
Impedance (Maximum): 95 Ohms
Current - Reverse Leakage @ Vr: 5 µA @ 38.8 V
Operating Temperature: 150°C
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts listed maintain identical electrical performance specifications and mechanical compatibility. Parts are grouped as direct parametric equivalents when all listed parameters match the main part number.

Parameter Comparison

Parameter	SML4757AHE3_A/I	SML4757A-E3/61	SML4757AHE3_A/H
Voltage - Zener (Nominal)	51 V	51 V	51 V
Tolerance	±5%	±5%	±5%
Power - Maximum	1 W	1 W	1 W
Impedance (Maximum)	95 Ohms	95 Ohms	95 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 38.8 V	5 µA @ 38.8 V	5 µA @ 38.8 V
Operating Temperature	150°C	150°C	150°C
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

SML4757AHE3_A/I (Main Part): This part carries automotive-grade qualification (AEC-Q101) and is suitable for applications requiring automotive compliance. Current inventory is 964 pieces.

SML4757A-E3/61: This substitute part is a direct parametric equivalent with identical electrical and mechanical specifications. It maintains ROHS3 compliance and MSL 1 rating. Inventory availability is significantly higher at 27,304 pieces, making this part suitable for high-volume applications. This part does not carry automotive-grade qualification in the provided specifications.

SML4757AHE3_A/H: This substitute part is a direct parametric equivalent with identical electrical and mechanical specifications. It carries automotive-grade qualification (AEC-Q101), matching the main part's compliance profile. Current inventory is 2,851 pieces. This part is suitable for automotive applications requiring AEC-Q101 certification.

All three parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating. Selection between these parts depends on inventory availability requirements and automotive qualification necessity for the end application.

Frequently Asked Questions (FAQ)

Q: Can SML4757A-E3/61 be used as a direct replacement for SML4757AHE3_A/I?

A: Yes. SML4757A-E3/61 is a direct parametric equivalent with identical zener voltage (51 V), power rating (1 W), tolerance (±5%), impedance (95 Ohms), reverse leakage current (5 µA @ 38.8 V), operating temperature (150°C), and package (DO-214AC, SMA). Both parts are ROHS3 compliant with MSL 1 rating. The primary difference is automotive-grade qualification; SML4757AHE3_A/I carries AEC-Q101 certification while SML4757A-E3/61 does not.

Q: What is the difference between SML4757AHE3_A/I and SML4757AHE3_A/H?

A: Both parts are parametrically identical across all electrical and mechanical specifications. Both carry automotive-grade qualification (AEC-Q101). The difference lies in inventory availability and internal manufacturing codes. SML4757AHE3_A/I has 964 pieces in stock, while SML4757AHE3_A/H has 2,851 pieces available.

Q: Are all substitute parts in the same DO-214AC package?

A: Yes. All listed substitute parts use the DO-214AC (SMA) surface mount package, ensuring mechanical and thermal compatibility with the main part.

Q: Which substitute part should be selected for automotive applications?

A: For automotive applications requiring AEC-Q101 certification, select either SML4757AHE3_A/I or SML4757AHE3_A/H. Both parts carry automotive-grade qualification. SML4757A-E3/61 does not carry automotive-grade qualification in the provided specifications.

Q: Are all parts ROHS3 compliant?

A: Yes. All listed parts, including the main part and substitutes, are ROHS3 compliant with unlimited moisture sensitivity (MSL 1).

Q: What is the base product number for these parts?

A: The base product number is SML4757. All listed parts share this common base designation with different suffixes indicating packaging and qualification variations.

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