1SMA4764 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA4764 is a 100 V, 1 W surface mount zener diode manufactured by SMC Diode Solutions in the DO-214AC (SMA) package. This component is designed for voltage regulation and protection applications requiring stable reverse breakdown characteristics at 100 V nominal. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified to provide design flexibility, supply chain alternatives, and application-specific options while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	100	V
Tolerance	±5	%
Power - Maximum	1	W
Impedance (Maximum)	350	Ohms
Current - Reverse Leakage @ 76 V	5	µA
Operating Temperature Range	-65 to 150	°C
Package / Case	DO-214AC (SMA)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 1SMA4764 are qualified based on the following critical parameters that determine functional interchangeability:

Electrical Parameters (Must Match):

Zener voltage (Vz): 100 V nominal
Tolerance: ±5%
Maximum power dissipation: 1 W
Maximum impedance (Zzt): 350 Ohms
Reverse leakage current: 5 µA @ 76 V
Operating temperature range: -65°C to 150°C

Mechanical Parameters (Must Match):

Package type: DO-214AC (SMA)
Mounting type: Surface Mount
Tape & Reel packaging format

Compliance Parameters:

RoHS3 compliance required
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts listed meet these criteria and are therefore electrically and mechanically equivalent to the 1SMA4764 for direct replacement in circuit applications.

Parameter Comparison

Parameter	1SMA4764 (SMC)	SMAJ4764A-TP (Micro Commercial Co)	SML4764AHE3_A/H (Vishay)
Voltage - Zener (Nom)	100 V	100 V	100 V
Tolerance	±5%	±5%	±5%
Power - Max	1 W	1 W	1 W
Impedance (Max)	350 Ohms	350 Ohms	350 Ohms
Current - Reverse Leakage @ 76 V	5 µA	5 µA	5 µA
Operating Temperature	-65°C to 150°C	-65°C to 150°C	-65°C to 150°C
Package / Case	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three parts listed—1SMA4764, SMAJ4764A-TP, and SML4764AHE3_A/H—are functionally equivalent and meet identical electrical and mechanical specifications for 100 V, 1 W zener diode applications.

Selection Considerations Based on Provided Data:

1SMA4764 (SMC Diode Solutions): Primary part with 15,100 units in stock. Suitable for general-purpose voltage regulation and protection circuits. ROHS3 compliant with REACH affected status.

SMAJ4764A-TP (Micro Commercial Co): Parametric equivalent with 16,589 units in stock. Identical electrical specifications with forward voltage specified at 100 mA. ROHS3 compliant with REACH unaffected status. Suitable for applications requiring REACH compliance documentation.

SML4764AHE3_A/H (Vishay): Parametric equivalent with 2,342 units in stock. Includes automotive-grade qualification (AEC-Q101) and automotive designation. ROHS3 compliant with REACH unaffected status. Recommended for automotive and high-reliability applications requiring AEC-Q101 certification.

Selection between these parts should be based on supply availability, regulatory requirements (REACH status), and application-specific certifications (automotive qualification).

Frequently Asked Questions (FAQ)

Q: Can SMAJ4764A-TP be used as a direct replacement for 1SMA4764?

A: Yes. Both parts share identical zener voltage (100 V), tolerance (±5%), power rating (1 W), impedance (350 Ohms), reverse leakage current (5 µA @ 76 V), operating temperature range (-65°C to 150°C), and package type (DO-214AC/SMA). They are electrically and mechanically interchangeable.

Q: Can SML4764AHE3_A/H be used as a direct replacement for 1SMA4764?

A: Yes. The Vishay SML4764AHE3_A/H meets all electrical and mechanical specifications of the 1SMA4764. The additional automotive qualification (AEC-Q101) does not prevent its use in non-automotive applications.

Q: What is the difference between these substitute parts?

A: The three parts are electrically identical. Differences exist in manufacturer, stock availability, REACH compliance status, and automotive certification. The Vishay part includes AEC-Q101 automotive qualification; the other two do not.

Q: Are there any forward voltage differences between these parts?

A: The 1SMA4764 specifies forward voltage at 200 mA (1.2 V max), while SMAJ4764A-TP specifies it at 100 mA (1.2 V max). Both meet the same maximum specification. The SML4764AHE3_A/H does not provide forward voltage specification in the supplied data. These differences do not affect substitution compatibility.

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. All three parts use identical DO-214AC (SMA) surface mount packaging and tape & reel format, ensuring compatibility with standard pick-and-place assembly equipment and PCB footprints.

Q: Which part should be selected for automotive applications?

A: The SML4764AHE3_A/H is qualified to AEC-Q101 automotive standards and carries automotive-grade designation, making it the appropriate choice for automotive circuit designs.

Q: What is the REACH compliance status difference?

A: The 1SMA4764 is listed as REACH Affected, while SMAJ4764A-TP and SML4764AHE3_A/H are listed as REACH Unaffected. Applications requiring REACH unaffected status should use either the Micro Commercial Co or Vishay part.

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