1SMA4763H Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA4763H is an active-status Zener diode manufactured by Taiwan Semiconductor Corporation, rated at 91 V nominal Zener voltage with 1.25 W maximum power dissipation. This surface-mount component in DO-214AC (SMA) package is designed for voltage regulation and protection applications in automotive-grade circuits. The part is AEC-Q101 qualified and RoHS3 compliant. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when alternative electrical characteristics better suit specific application requirements.

Substiute Parts

1SMA4763H

Taiwan Semiconductor CorporationIn Stock: 8511SMA4763H 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 Zener diodes is determined by matching the following critical electrical and mechanical parameters:

Primary Matching Criteria:

• Zener voltage (Vz): Must be 91 V nominal with ±5% tolerance
• Package type: DO-214AC (SMA) surface-mount package
• Mounting configuration: Surface mount
• Compliance standards: RoHS3 compliant, REACH unaffected

Secondary Compatibility Factors:

• Power dissipation rating: Substitute parts may have equal or higher power ratings
• Impedance (Zzt): Acceptable within specified maximum values
• Reverse leakage current: Specified at reference voltage
• Operating temperature range: Substitute parts must support the application's thermal requirements
• Product status: Active status ensures ongoing availability and support

The identified substitute parts maintain the 91 V Zener voltage specification and DO-214AC package format, ensuring direct mechanical and electrical compatibility. Variations in power rating, impedance, and temperature range are documented to support selection based on specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

1SMA4763H (Primary Part) The 1SMA4763H remains the specified component for applications requiring automotive-grade AEC-Q101 qualification with an operating temperature range of -55°C to 175°C. This part supports the widest thermal operating window among the three options and is suitable for high-temperature automotive environments.

SMAJ4763A-TP (Lower Power Alternative) The SMAJ4763A-TP is suitable for applications where power dissipation does not exceed 1 W. This part maintains the 91 V Zener voltage and DO-214AC package compatibility. The operating temperature range of -65°C to 150°C is acceptable for applications not requiring the extended high-temperature capability of the primary part. Higher reverse leakage current (5 µA versus 1 µA) must be evaluated against circuit requirements.

3SMAJ5948B-TP (Higher Power Alternative) The 3SMAJ5948B-TP provides 3 W power dissipation capability, supporting applications requiring higher power handling. The 91 V Zener voltage and DO-214AC package ensure direct compatibility. The impedance specification of 200 Ohms (versus 250 Ohms in the primary part) represents improved dynamic performance. The operating temperature range of -55°C to 150°C is suitable for standard automotive applications not requiring extended high-temperature operation above 150°C.

All substitute parts maintain RoHS3 compliance, REACH unaffected status, and active product status, ensuring regulatory compliance and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4763A-TP be used as a direct replacement for 1SMA4763H? A: SMAJ4763A-TP is mechanically and electrically compatible in terms of Zener voltage (91 V) and package format (DO-214AC). However, the power rating is lower (1 W versus 1.25 W), and the operating temperature range is reduced to -65°C to 150°C. Selection depends on whether the application's power dissipation and thermal requirements fall within these specifications.

Q: What is the primary difference between 3SMAJ5948B-TP and 1SMA4763H? A: Both parts share the same 91 V Zener voltage and DO-214AC package. The 3SMAJ5948B-TP provides higher power dissipation (3 W versus 1.25 W) and lower impedance (200 Ohms versus 250 Ohms). The operating temperature maximum is 150°C compared to 175°C for the primary part. Selection is based on power handling requirements and thermal environment.

Q: Are all three parts RoHS3 compliant? A: Yes, all three parts (1SMA4763H, SMAJ4763A-TP, and 3SMAJ5948B-TP) are RoHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), ensuring compatibility with standard manufacturing processes and regulatory requirements.

Q: What does the ±5% tolerance specification mean? A: The ±5% tolerance on the 91 V Zener voltage indicates that the actual Zener voltage will fall between 86.45 V and 95.55 V. All three substitute parts maintain this same tolerance specification.

Q: Can these parts be used interchangeably in automotive applications? A: All three parts are suitable for automotive applications and maintain active product status. However, the 1SMA4763H is specifically AEC-Q101 qualified and supports the extended temperature range to 175°C. For automotive applications requiring AEC-Q101 qualification, the primary part is the specified choice. Substitutes are acceptable where AEC-Q101 qualification is not a design requirement.

Q: What is the significance of the DO-214AC (SMA) package format? A: The DO-214AC package is a standardized surface-mount package for small-signal diodes. All three parts use this identical package, ensuring mechanical compatibility with PCB layouts and automated assembly equipment. No package-related design changes are required when substituting between these parts.

Q: How does reverse leakage current affect part selection? A: The 1SMA4763H and 3SMAJ5948B-TP specify 1 µA reverse leakage at 69.2 V, while SMAJ4763A-TP specifies 5 µA. Lower leakage current is preferable in high-impedance circuits. Applications sensitive to leakage current should prioritize parts with 1 µA specification.