1SMA4763 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA4763 is a 91 V, 1 W surface mount zener diode manufactured by SMC Diode Solutions in the DO-214AC (SMA) package. This component is classified as an active product with full RoHS3 compliance and unlimited moisture sensitivity rating. The 1SMA4763 serves voltage regulation and transient protection applications requiring a nominal zener voltage of 91 V with ±5% tolerance. Substitute parts are identified when equivalent electrical parameters, mechanical packaging, and compliance certifications align with the original specification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	91	V
Tolerance	±5	%
Power - Max	1	W
Impedance (Max)	250	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 69.2 V
Operating Temperature Range	-65 to 150	°C
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the 1SMA4763 are qualified based on the following electrical and mechanical parameters:

Substitution Criteria:

Nominal zener voltage: 91 V
Voltage tolerance: ±5%
Maximum power dissipation: 1 W
Maximum impedance: 250 Ohms
Reverse leakage current: 5 µA @ 69.2 V
Operating temperature range: -65°C to 150°C
Package type: DO-214AC (SMA)
Mounting configuration: Surface Mount
RoHS3 compliance requirement

All identified substitute parts meet these core parameters. The SMAJ4763A-TP (Micro Commercial Co) and SML4763A-E3/61 (Vishay) are standard industrial-grade equivalents. The SML4763AHE3_A/I (Vishay) is an automotive-qualified variant meeting AEC-Q101 specification, suitable for applications requiring automotive-grade reliability.

Parameter Comparison

Parameter	1SMA4763 (SMC)	SMAJ4763A-TP (MCC)	SML4763A-E3/61 (Vishay)	SML4763AHE3_A/I (Vishay)
Voltage - Zener (Nom)	91 V	91 V	91 V	91 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	1 W	1 W	1 W	1 W
Impedance (Max)	250 Ohms	250 Ohms	250 Ohms	250 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 69.2 V	5 µA @ 69.2 V	5 µA @ 69.2 V	5 µA @ 69.2 V
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Automotive Grade	—	—	—	AEC-Q101

Engineering Selection Recommendations

Standard Industrial Applications: The SMAJ4763A-TP (Micro Commercial Co) and SML4763A-E3/61 (Vishay) are direct parametric equivalents to the 1SMA4763. Both maintain identical electrical specifications and RoHS3 compliance. Selection between these options depends on supplier availability and inventory requirements.

Automotive and High-Reliability Applications: The SML4763AHE3_A/I (Vishay) is qualified to AEC-Q101 automotive specification and is suitable for applications requiring automotive-grade component certification. This variant maintains all electrical parameters of the standard equivalents while providing additional qualification documentation for automotive supply chains.

Compliance Considerations: All substitute parts are RoHS3 compliant with MSL 1 (Unlimited) rating. The 1SMA4763 is REACH Affected; substitute parts from Vishay and Micro Commercial Co are REACH Unaffected, which may simplify compliance documentation in certain supply chain scenarios.

Frequently Asked Questions (FAQ)

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

A: Yes. The SMAJ4763A-TP meets all electrical parameters specified for the 1SMA4763, including 91 V nominal zener voltage, ±5% tolerance, 1 W maximum power, 250 Ohms maximum impedance, and identical operating temperature range. Both components use the DO-214AC (SMA) surface mount package.

Q: What is the difference between the SML4763A-E3/61 and SML4763AHE3_A/I?

A: Both Vishay parts are parametrically identical in electrical specifications. The SML4763AHE3_A/I carries AEC-Q101 automotive qualification, making it suitable for automotive applications requiring certified component grades. The SML4763A-E3/61 is the standard industrial variant.

Q: Are there differences in forward voltage specifications between the substitute parts?

A: The 1SMA4763 specifies maximum forward voltage of 1.2 V @ 200 mA. The SMAJ4763A-TP specifies 1.2 V @ 100 mA. This difference reflects measurement conditions rather than functional incompatibility. Both parts operate within the same forward voltage envelope for typical application currents.

Q: Do all substitute parts have the same moisture sensitivity rating?

A: Yes. All substitute parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage, handling, or reflow processes.

Q: Which substitute part should be selected for cost optimization?

A: Selection should be based on current supplier inventory and pricing. The SMAJ4763A-TP (7516 units in stock) and SML4763AHE3_A/I (8520 units in stock) offer higher inventory availability compared to SML4763A-E3/61 (1804 units in stock).

Q: Are all substitute parts suitable for the same PCB assembly process?

A: Yes. All substitute parts use identical DO-214AC (SMA) surface mount packaging and are compatible with standard reflow soldering processes. No process modifications are required when substituting between these parts.

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