1SMA4753 R3G Equivalent & Substitute Parts

Part Overview

The 1SMA4753 R3G is a 36 V, 1.25 W Zener diode manufactured by Taiwan Semiconductor Corporation in DO-214AC (SMA) surface mount package. This component is designed for voltage regulation and protection applications in electronic circuits. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain functional compatibility while meeting application requirements.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	36 V
Tolerance	±5%
Power - Max	1.25 W
Impedance (Max)	50 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 27.4 V
Operating Temperature	-55°C ~ 175°C (TJ)
Package / Case	DO-214AC, SMA
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 1SMA4753 R3G is determined by the following critical parameters: nominal Zener voltage (36 V), maximum power dissipation (1.25 W), package type (DO-214AC/SMA), and surface mount configuration. Parts are classified into two categories:

Parametric Equivalents maintain all electrical specifications and package requirements, differing only in packaging format (Cut Tape vs. Tape & Reel) or automotive qualification grade. These parts are direct functional replacements.

Similar Parts share the 36 V Zener voltage and DO-214AC package but differ in one or more of the following: maximum power rating, impedance, reverse leakage current, forward voltage, or operating temperature range. These parts are suitable only when application requirements permit deviation from the original specifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Zener (Nom)	Tolerance	Power - Max	Impedance (Max)	Current - Reverse Leakage @ Vr	Operating Temperature	Package / Case	Product Status	Packaging
1SMA4753 R3G	Taiwan Semiconductor Corporation	36 V	±5%	1.25 W	50 Ohms	1 µA @ 27.4 V	-55°C ~ 175°C	DO-214AC, SMA	Discontinued at DiGi Electronics	Cut Tape (CT) & Digi-Reel®
1PGSMA4753	Taiwan Semiconductor Corporation	36 V	±5%	1.25 W	50 Ohms	1 µA @ 27.4 V	-55°C ~ 175°C	DO-214AC, SMA	Active	Tape & Reel (TR)
1PGSMA4753H	Taiwan Semiconductor Corporation	36 V	±5%	1.25 W	50 Ohms	1 µA @ 27.4 V	-55°C ~ 175°C	DO-214AC, SMA	Active	Tape & Reel (TR)
1PGSMA4753HR3G	Taiwan Semiconductor Corporation	36 V	±5%	1.25 W	50 Ohms	1 µA @ 27.4 V	-55°C ~ 175°C	DO-214AC, SMA	Discontinued at DiGi Electronics	Cut Tape (CT)
1SMA4753	Taiwan Semiconductor Corporation	36 V	±5%	1.25 W	50 Ohms	1 µA @ 27.4 V	-55°C ~ 175°C	DO-214AC, SMA	Active	Tape & Reel (TR)
1SMA4753H	Taiwan Semiconductor Corporation	36 V	±5%	1.25 W	50 Ohms	1 µA @ 27.4 V	-55°C ~ 175°C	DO-214AC, SMA	Active	Tape & Reel (TR)
1SMA5938BT3G	onsemi	36 V	±5%	1.5 W	38 Ohms	500 nA @ 27.4 V	-65°C ~ 150°C	DO-214AC, SMA	Active	Cut Tape (CT) & Digi-Reel®
3SMAJ5938B-TP	Micro Commercial Co	36 V	±5%	3 W	38 Ohms	1 µA @ 27.4 V	-55°C ~ 150°C	DO-214AC, SMA	Active	Tape & Reel (TR)
SMAJ4753A-TP	Micro Commercial Co	36 V	±5%	1 W	50 Ohms	5 µA @ 27.4 V	-65°C ~ 150°C	DO-214AC, SMA	Active	Cut Tape (CT) & Digi-Reel®
SMAJ4753AE3/TR13	Microchip Technology	36 V	±5%	2 W	50 Ohms	5 µA @ 27.4 V	-55°C ~ 150°C	DO-214AC, SMA	Active	Tape & Reel (TR)
SMAJ4753CE3/TR13	Microchip Technology	36 V	±2%	2 W	50 Ohms	5 µA @ 27.4 V	-55°C ~ 150°C	DO-214AC, SMA	Active	Tape & Reel (TR)

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended Primary Alternatives):

The 1SMA4753 (Tape & Reel) and 1SMA4753H (Tape & Reel, Automotive Grade, AEC-Q101) are active production parts from Taiwan Semiconductor Corporation with identical electrical specifications to the discontinued 1SMA4753 R3G. Both maintain 36 V nominal Zener voltage, 1.25 W maximum power, 50 Ohms impedance, and -55°C to 175°C operating temperature range. The 1SMA4753H includes automotive qualification (AEC-Q101) for applications requiring automotive-grade components. The 1PGSMA4753 and 1PGSMA4753H variants provide equivalent performance with alternative packaging formats.

Secondary Alternatives (Conditional Use):

The 1SMA5938BT3G (onsemi) provides higher power dissipation (1.5 W) and lower impedance (38 Ohms) with reduced reverse leakage current (500 nA). This part is suitable for applications where increased power handling is beneficial. Operating temperature range is -65°C to 150°C, which is narrower at the upper limit than the original part.

The SMAJ4753AE3/TR13 and SMAJ4753CE3/TR13 (Microchip Technology) offer 2 W power rating with identical impedance (50 Ohms). The SMAJ4753CE3/TR13 provides tighter voltage tolerance (±2% versus ±5%), suitable for precision regulation applications. Both operate to -55°C to 150°C.

The 3SMAJ5938B-TP (Micro Commercial Co) provides significantly higher power dissipation (3 W) for applications requiring enhanced thermal performance.

The SMAJ4753A-TP (Micro Commercial Co) provides lower power rating (1 W) and is suitable only for applications with reduced power requirements.

Frequently Asked Questions (FAQ)

Q: Can I use 1SMA4753 (Tape & Reel) as a direct replacement for 1SMA4753 R3G (Cut Tape)?

A: Yes. Both parts are manufactured by Taiwan Semiconductor Corporation with identical electrical specifications: 36 V nominal Zener voltage, 1.25 W maximum power, 50 Ohms impedance, and -55°C to 175°C operating temperature. The difference is packaging format only (Tape & Reel versus Cut Tape & Digi-Reel). The 1SMA4753 is currently in active production with higher inventory availability.

Q: What is the difference between 1SMA4753H and 1SMA4753?

A: Both parts have identical electrical specifications. The 1SMA4753H includes automotive qualification (AEC-Q101 certified) and automotive-grade designation, making it suitable for automotive applications. Select 1SMA4753H when automotive qualification is required; otherwise, either part is functionally equivalent.

Q: Can I substitute the 1SMA5938BT3G for the 1SMA4753 R3G?

A: The 1SMA5938BT3G (onsemi) shares the 36 V Zener voltage and DO-214AC package but differs in power rating (1.5 W versus 1.25 W), impedance (38 Ohms versus 50 Ohms), reverse leakage current (500 nA versus 1 µA), and operating temperature range (-65°C to 150°C versus -55°C to 175°C). This part is suitable when higher power dissipation is acceptable and the narrower upper temperature limit does not conflict with application requirements.

Q: What does the "H" designation indicate in part numbers like 1SMA4753H?

A: The "H" designation indicates automotive-grade qualification with AEC-Q101 certification. These parts meet automotive industry standards and are suitable for automotive applications. Non-H variants are standard commercial-grade parts.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All parts listed in this reference are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of impedance (Zzt) in Zener diode selection?

A: Impedance (Zzt) affects the dynamic regulation characteristics of the Zener diode. Lower impedance provides better voltage regulation under varying load conditions. The original 1SMA4753 R3G has 50 Ohms impedance. Alternatives with 38 Ohms impedance (1SMA5938BT3G, 3SMAJ5938B-TP) provide improved regulation performance.

Q: Can I use SMAJ4753CE3/TR13 with ±2% tolerance instead of ±5% tolerance?

A: Yes. The SMAJ4753CE3/TR13 provides tighter voltage tolerance (±2% versus ±5%), which is a more stringent specification. This part is suitable for precision voltage regulation applications where tighter tolerance is beneficial. All other electrical parameters differ as shown in the parameter comparison table.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging provides individual components cut from a reel, suitable for small-quantity orders and manual assembly. Tape & Reel packaging provides components on continuous tape for automated pick-and-place assembly equipment. Both formats contain identical components; the difference is in delivery and handling format only.

Q: Is the 1PGSMA4753HR3G a suitable replacement for 1SMA4753 R3G?

A: Yes. The 1PGSMA4753HR3G is a parametric equivalent with identical electrical specifications and includes automotive qualification (AEC-Q101). It is currently discontinued at DiGi Electronics, so while functionally equivalent, it may have limited availability. The active production alternatives 1SMA4753 or 1SMA4753H are preferred for new designs.

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