1SMA4763 Equivalent & Substitute Parts

Part Overview

The 1SMA4763 is a surface mount Zener diode rated at 91 V nominal voltage with 1.25 W maximum power dissipation in a DO-214AC (SMA) package. Manufactured by Taiwan Semiconductor Corporation, this component is classified as Active and fully compliant with RoHS3 and REACH regulations. The part is supplied in Tape & Reel packaging with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, inventory availability changes, or when application-specific performance parameters require adjustment within the same functional category and package specification.

Substiute Parts

1SMA4763

Taiwan Semiconductor CorporationIn Stock: 151581SMA4763 Datasheet

Current PartRFQ

3SMAJ5948B-TP

Micro Commercial CoIn Stock: 64763SMAJ5948B-TP Datasheet

SimilarRFQ

SMAJ4763A-TP

Micro Commercial CoIn Stock: 7589SMAJ4763A-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1SMA4763 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Zener voltage (Nominal): 91 V ±5% tolerance
• Package / Case: DO-214AC (SMA) surface mount
• Mounting Type: Surface Mount
• Regulatory Compliance: RoHS3 Compliant, REACH Unaffected

Secondary Compatibility Parameters:

• Power rating (may be equal or higher)
• Impedance (Zzt) at maximum specification
• Reverse leakage current characteristics
• Operating temperature range (must encompass or match application requirements)

The substitute parts identified—SMAJ4763A-TP and 3SMAJ5948B-TP—maintain identical Zener voltage specifications and package form factors. Variations in power dissipation, impedance, and temperature range are documented to enable selection based on specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

1SMA4763 (Taiwan Semiconductor Corporation)

Select this part when the application requires the highest operating temperature capability (175°C maximum junction temperature) and the specified 1.25 W power dissipation is sufficient. This part maintains the lowest reverse leakage current specification at 1 µA @ 69.2 V.

SMAJ4763A-TP (Micro Commercial Co)

This substitute is suitable for applications where power dissipation requirements are lower (1 W maximum) and operating temperature does not exceed 150°C. The impedance specification matches the main part at 250 Ohms. Reverse leakage current is specified at 5 µA @ 69.2 V, which is acceptable for general-purpose voltage regulation applications.

3SMAJ5948B-TP (Micro Commercial Co)

This substitute provides the highest power dissipation capability (3 W maximum) and is selected when thermal management requirements exceed the 1.25 W rating of the main part. The impedance is reduced to 200 Ohms, providing improved dynamic response. Operating temperature range is -55°C to 150°C. Reverse leakage current matches the main part at 1 µA @ 69.2 V.

All substitute parts maintain RoHS3 compliance, REACH unaffected status, and identical DO-214AC (SMA) package specifications, ensuring direct mechanical and electrical compatibility within the specified parameter ranges.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4763A-TP be used as a direct replacement for 1SMA4763?

A: SMAJ4763A-TP is electrically compatible for applications where the maximum operating temperature does not exceed 150°C and power dissipation does not exceed 1 W. The Zener voltage, tolerance, package, and mounting type are identical. Reverse leakage current is higher at 5 µA versus 1 µA, which may affect precision voltage reference applications.

Q: What is the primary difference between 1SMA4763 and 3SMAJ5948B-TP?

A: The primary differences are power dissipation (1.25 W versus 3 W), impedance (250 Ohms versus 200 Ohms), and maximum operating temperature (175°C versus 150°C). The 3SMAJ5948B-TP is selected when higher power handling is required. All other electrical parameters, including Zener voltage and tolerance, remain identical.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All parts listed—1SMA4763, SMAJ4763A-TP, and 3SMAJ5948B-TP—are supplied in DO-214AC (SMA) surface mount package in Tape & Reel (TR) format with unlimited moisture sensitivity level (MSL 1).

Q: Which substitute part has the lowest reverse leakage current?

A: Both 1SMA4763 and 3SMAJ5948B-TP specify 1 µA @ 69.2 V reverse leakage current. SMAJ4763A-TP specifies 5 µA @ 69.2 V, which is higher and may be relevant for precision applications requiring minimal leakage.

Q: Can these parts be used interchangeably in high-temperature applications above 150°C?

A: No. Only the 1SMA4763 is rated for continuous operation up to 175°C. SMAJ4763A-TP and 3SMAJ5948B-TP are limited to 150°C maximum operating temperature. Application requirements must be evaluated against the specified operating temperature range of each part.

Q: What is the impedance difference between these parts, and does it matter?

A: The 1SMA4763 and SMAJ4763A-TP both specify 250 Ohms maximum impedance, while 3SMAJ5948B-TP specifies 200 Ohms. Lower impedance provides better transient response and is preferred in applications requiring fast voltage regulation. Higher impedance may be acceptable in general-purpose voltage clamping applications.