1SMA4752 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA4752 is a 33 V, 1.25 W surface mount zener diode manufactured by Taiwan Semiconductor Corporation in the DO-214AC (SMA) package. This component is classified as Active product status and is ROHS3 compliant. The 1SMA4752 operates across a temperature range of -55°C to 175°C with ±5% voltage tolerance and is designed for voltage regulation and protection applications in electronic circuits. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design flexibility, or application-specific requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	33	V
Power - Max	1.25	W
Tolerance	±5	%
Impedance (Max)	45	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 25.1 V
Operating Temperature	-55 to 175	°C
Mounting Type	Surface Mount
Package / Case	DO-214AC, SMA
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 1SMA4752 zener diode is determined by the following critical parameters: nominal zener voltage (33 V), voltage tolerance (±5%), package type (DO-214AC/SMA surface mount), and maximum power dissipation capability (1.25 W). Substitute parts must maintain the 33 V zener voltage specification and ±5% tolerance to ensure functional equivalence in voltage regulation circuits. The DO-214AC/SMA package requirement ensures mechanical and thermal compatibility with existing PCB layouts and soldering processes. Maximum power rating may vary among substitutes; parts with equal or greater power ratings provide direct substitution capability. Impedance, reverse leakage current, and operating temperature range are secondary parameters that influence performance characteristics but do not prevent substitution when primary electrical and mechanical parameters align.

Parameter Comparison

Part Number	Manufacturer	Voltage - Zener (Nom) (V)	Tolerance (%)	Power - Max (W)	Impedance (Max) (Ohms)	Current - Reverse Leakage @ Vr (µA)	Operating Temperature (°C)	Package / Case	Product Status
1SMA4752	Taiwan Semiconductor Corporation	33	±5	1.25	45	1 @ 25.1 V	-55 to 175	DO-214AC, SMA	Active
1SMA4752H	Taiwan Semiconductor Corporation	33	±5	1.25	45	1 @ 25.1 V	-55 to 175	DO-214AC, SMA	Active
1SMA5937BT3G	onsemi	33	±5	1.5	33	0.5 @ 25.1 V	-65 to 150	DO-214AC, SMA	Active
3SMAJ5937B-TP	Micro Commercial Co	33	±5	3	33	1 @ 25 V	-55 to 150	DO-214AC, SMA	Active
SMAJ4752A-TP	Micro Commercial Co	33	±5	1	45	5 @ 25.1 V	-65 to 150	DO-214AC, SMA	Active
SMAZ33-TP	Micro Commercial Co	33	±5	1	15	0.5 @ 25.1 V	-65 to 150	DO-214AC, SMA	Active
SZ1SMA5937BT3G	onsemi	33	±5	1.5	33	0.5 @ 25.1 V	-65 to 150	DO-214AC, SMA	Active

Engineering Selection Recommendations

Parametric Equivalent (Direct Substitution):

The 1SMA4752H from Taiwan Semiconductor Corporation is a parametric equivalent to the 1SMA4752. Both parts share identical electrical specifications (33 V nominal zener voltage, ±5% tolerance, 1.25 W maximum power, 45 Ohms impedance) and mechanical packaging (DO-214AC/SMA). The 1SMA4752H includes AEC-Q101 automotive qualification, which provides additional reliability assurance for applications requiring automotive-grade components. Both parts are Active status and ROHS3 compliant.

Higher Power Capability Substitutes:

The 1SMA5937BT3G and SZ1SMA5937BT3G from onsemi provide 1.5 W maximum power dissipation compared to the 1.25 W rating of the 1SMA4752. Both maintain the 33 V nominal zener voltage and ±5% tolerance. The SZ1SMA5937BT3G includes AEC-Q101 automotive qualification. These parts are suitable for applications requiring increased thermal headroom or higher current handling. Operating temperature range is -65°C to 150°C.

The 3SMAJ5937B-TP from Micro Commercial Co provides 3 W maximum power dissipation, offering the highest power capability among substitutes. This part maintains 33 V nominal zener voltage and ±5% tolerance with DO-214AC/SMA packaging. Operating temperature range is -55°C to 150°C.

Lower Power Capability Substitutes:

The SMAJ4752A-TP and SMAZ33-TP from Micro Commercial Co both provide 1 W maximum power dissipation, which is lower than the 1.25 W rating of the 1SMA4752. These parts maintain 33 V nominal zener voltage and ±5% tolerance with DO-214AC/SMA packaging. The SMAZ33-TP features lower impedance (15 Ohms) and lower reverse leakage current (0.5 µA). Operating temperature range for both is -65°C to 150°C.

All substitute parts are Active status and ROHS3 compliant, ensuring regulatory compliance equivalent to the main part.

Frequently Asked Questions (FAQ)

Q: Can the 1SMA4752H be used as a direct replacement for the 1SMA4752?

A: Yes. The 1SMA4752H is a parametric equivalent with identical electrical specifications (33 V, ±5%, 1.25 W) and mechanical packaging (DO-214AC/SMA). The primary difference is the inclusion of AEC-Q101 automotive qualification on the 1SMA4752H.

Q: What is the difference between the 1SMA4752 and the 1SMA5937BT3G?

A: Both parts share the same 33 V nominal zener voltage and ±5% tolerance. The 1SMA5937BT3G provides higher maximum power dissipation (1.5 W versus 1.25 W) and lower impedance (33 Ohms versus 45 Ohms). The 1SMA5937BT3G operates at -65°C to 150°C, while the 1SMA4752 operates at -55°C to 175°C.

Q: Can I use the SMAJ4752A-TP or SMAZ33-TP as substitutes if my application requires 1.25 W power dissipation?

A: The SMAJ4752A-TP and SMAZ33-TP are rated for 1 W maximum power dissipation, which is lower than the 1.25 W specification of the 1SMA4752. These parts are suitable only for applications with power dissipation requirements at or below 1 W.

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

A: Yes. All substitute parts listed are available in DO-214AC/SMA surface mount packaging, ensuring mechanical and thermal compatibility with PCB layouts designed for the 1SMA4752.

Q: What is the significance of the AEC-Q101 qualification on the 1SMA4752H and SZ1SMA5937BT3G?

A: AEC-Q101 is an automotive industry qualification standard. Parts bearing this qualification have undergone additional reliability testing and are approved for use in automotive applications. This qualification does not affect electrical performance but indicates enhanced quality assurance.

Q: Which substitute provides the lowest reverse leakage current?

A: The 1SMA5937BT3G, SZ1SMA5937BT3G, and SMAZ33-TP all provide 0.5 µA reverse leakage current at 25.1 V, compared to 1 µA for the 1SMA4752.

Q: What is the operating temperature range difference between the 1SMA4752 and its substitutes?

A: The 1SMA4752 operates from -55°C to 175°C. Most substitutes operate from -65°C to 150°C, providing lower temperature capability but reduced upper temperature limit. The 3SMAJ5937B-TP operates from -55°C to 150°C, matching the lower temperature limit of the 1SMA4752 but with a reduced upper limit.

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