SML4752A-E3/5A Equivalent & Substitute Parts

Part Overview

The SML4752A-E3/5A is a Zener diode rated at 33 V, 1 W, manufactured by Vishay General Semiconductor - Diodes Division in the DO-214AC (SMA) surface mount package. This component is classified as Active and is ROHS3 compliant. Alternative part numbers become necessary due to inventory availability, supply chain considerations, or specific application requirements such as automotive qualification or enhanced electrical performance characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	33	V
Tolerance	±5	%
Power - Maximum	1	W
Impedance (Maximum)	45	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 25.1 V
Operating Temperature	150	°C
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SML4752A-E3/5A is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nominal): 33 V
Tolerance: ±5%
Power - Maximum: 1 W (or higher)
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into three categories based on electrical and mechanical compatibility:

Category 1: Direct Manufacturer Equivalents — Parts with identical electrical specifications and packaging from Vishay General Semiconductor - Diodes Division. These include SML4752A-E3/61 and SML4752AHE3_A/H (automotive-qualified variant).

Category 2: Cross-Manufacturer Equivalents — Parts from alternative manufacturers (Micro Commercial Co, onsemi) with matching nominal voltage, tolerance, and package specifications. These include SMAJ4752A-TP, SMAZ33-TP, and SZ1SMA5937BT3G.

Category 3: Enhanced Performance Alternatives — Parts with superior electrical characteristics (higher power rating, lower impedance, or reduced reverse leakage) while maintaining the 33 V nominal voltage and DO-214AC package. These include 3SMAJ5937B-TP (3 W) and SZ1SMA5937BT3G (1.5 W).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Temp Range	Package	AEC-Q101
SML4752A-E3/5A	Vishay	33 V	±5%	1 W	45 Ω	5 µA @ 25.1 V	—	DO-214AC	—
SML4752A-E3/61	Vishay	33 V	±5%	1 W	45 Ω	5 µA @ 25.1 V	—	DO-214AC	—
SML4752AHE3_A/H	Vishay	33 V	±5%	1 W	45 Ω	5 µA @ 25.1 V	—	DO-214AC	Yes
SMAJ4752A-TP	Micro Commercial Co	33 V	±5%	1 W	45 Ω	5 µA @ 25.1 V	-65°C ~ 150°C	DO-214AC	—
SMAZ33-TP	Micro Commercial Co	33 V	±5%	1 W	15 Ω	500 nA @ 25.1 V	-65°C ~ 150°C	DO-214AC	—
SZ1SMA5937BT3G	onsemi	33 V	±5%	1.5 W	33 Ω	500 nA @ 25.1 V	-65°C ~ 150°C	DO-214AC	Yes
3SMAJ5937B-TP	Micro Commercial Co	33 V	±5%	3 W	33 Ω	1 µA @ 25 V	-55°C ~ 150°C	DO-214AC	—

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select SML4752A-E3/61 or SML4752AHE3_A/H when exact electrical and mechanical compatibility is required. SML4752A-E3/61 is a direct Vishay equivalent with identical parameters. SML4752AHE3_A/H is the automotive-qualified variant (AEC-Q101) from the same manufacturer, suitable for applications requiring automotive-grade components.

For Cross-Manufacturer Substitution (Equivalent Performance): SMAJ4752A-TP (Micro Commercial Co) and SMAZ33-TP (Micro Commercial Co) provide equivalent 33 V, 1 W specifications in the DO-214AC package. SMAZ33-TP offers improved electrical characteristics with lower impedance (15 Ω vs. 45 Ω) and reduced reverse leakage (500 nA vs. 5 µA).

For Enhanced Performance Requirements: SZ1SMA5937BT3G (onsemi) provides 1.5 W power rating with AEC-Q101 automotive qualification, lower impedance (33 Ω), and reduced reverse leakage (500 nA). This part is suitable for applications requiring higher power dissipation or automotive compliance.

3SMAJ5937B-TP (Micro Commercial Co) provides 3 W power rating for applications requiring significantly higher power handling capacity while maintaining the 33 V nominal voltage and DO-214AC package.

Compliance Considerations: All listed substitute parts are ROHS3 compliant and REACH unaffected. Parts with AEC-Q101 qualification (SML4752AHE3_A/H and SZ1SMA5937BT3G) are suitable for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can SML4752A-E3/61 be used as a direct replacement for SML4752A-E3/5A?

A: Yes. Both parts are manufactured by Vishay General Semiconductor - Diodes Division with identical electrical specifications (33 V, 1 W, ±5% tolerance, 45 Ω impedance) and the same DO-214AC package. The difference in part number suffix reflects packaging reel configuration only.

Q: What is the difference between SML4752AHE3_A/H and SML4752A-E3/5A?

A: SML4752AHE3_A/H is the automotive-qualified variant with AEC-Q101 certification. Electrical specifications are identical. This part is required for automotive applications subject to AEC-Q101 qualification requirements.

Q: Can SMAZ33-TP replace SML4752A-E3/5A?

A: Yes, with noted improvements. SMAZ33-TP maintains the 33 V nominal voltage, ±5% tolerance, 1 W power rating, and DO-214AC package. It offers superior electrical characteristics: lower impedance (15 Ω vs. 45 Ω) and reduced reverse leakage (500 nA vs. 5 µA). Operating temperature range is -65°C to 150°C.

Q: When should SZ1SMA5937BT3G be selected instead of the original part?

A: SZ1SMA5937BT3G is selected when higher power dissipation (1.5 W vs. 1 W), lower impedance (33 Ω vs. 45 Ω), reduced reverse leakage (500 nA vs. 5 µA), or automotive qualification (AEC-Q101) is required. All other parameters remain compatible.

Q: Is 3SMAJ5937B-TP a suitable substitute?

A: 3SMAJ5937B-TP is suitable when significantly higher power handling (3 W vs. 1 W) is required. It maintains the 33 V nominal voltage, ±5% tolerance, and DO-214AC package. Lower impedance (33 Ω) and reduced reverse leakage (1 µA) are additional benefits. Operating temperature range is -55°C to 150°C.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the original SML4752A-E3/5A.

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

A: DO-214AC is the industry-standard surface mount package for 1 W Zener diodes (also designated SMA). All listed substitute parts use this identical package, ensuring mechanical and thermal compatibility on PCBs designed for the original part.

Q: Can parts with different power ratings (1.5 W or 3 W) be used in circuits designed for 1 W components?

A: Yes. Higher power-rated parts (1.5 W or 3 W) are electrically and mechanically compatible with circuits designed for 1 W components. They provide additional thermal margin and are suitable for applications with higher power dissipation requirements or thermal stress conditions.

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