MMSZ4684 Zener Diode 3.3V 500mW SOD-123 Equivalent & Substitute Parts

Part Overview

The MMSZ4684 is a surface mount zener diode rated for 3.3 V nominal zener voltage with 500 mW maximum power dissipation in SOD-123 package. This component is classified as obsolete by the original manufacturer (onsemi). Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this zener diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±5%	—
Power - Max	500	mW
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMSZ4684 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 3.3 V
Power - Max: 500 mW
Package / Case: SOD-123
Mounting Type: Surface Mount
Tolerance: ±5% (or tighter)
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA (or lower)
Operating Temperature Range: -55°C to 150°C (or wider)

Substitute parts are grouped into three categories based on product status and qualification level:

Category 1: Active onsemi Parts (Direct Replacements) Parts with identical electrical specifications and active product status from the original manufacturer.

Category 2: Active Automotive-Grade Parts (AEC-Q101 Qualified) Parts meeting automotive qualification standards with identical electrical specifications, suitable for applications requiring automotive-grade components.

Category 3: Active Alternative Manufacturer Parts Parts from alternative manufacturers (Diodes Incorporated, Micro Commercial Co) meeting identical electrical and package specifications with active product status.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Vf (Max) @ If	Temp Range	Package	Product Status	Automotive Grade
MMSZ4684	onsemi	3.3 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Obsolete	No
MMSZ3V3T1G	onsemi	3.3 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	No
MMSZ4684T1G	onsemi	3.3 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	No
MMSZ4684T3G	onsemi	3.3 V	±5.15%	500 mW	900 mV @ 10 mA	-65 to 150°C	SOD-123	Obsolete	No
MMSZ5226BT1G	onsemi	3.3 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	No
SZMMSZ3V3T1G	onsemi	3.3 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	Yes (AEC-Q101)
SZMMSZ4684T1G	onsemi	3.3 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	Yes (AEC-Q101)
SZMMSZ5226BT1G	onsemi	3.3 V	±5%	500 mW	900 mV @ 10 mA	-55 to 150°C	SOD-123	Active	Yes (AEC-Q101)
DDZ9684-7	Diodes Incorporated	3.3 V	±5%	500 mW	900 mV @ 10 mA	-65 to 150°C	SOD-123	Active	No
DDZ9684Q-7	Diodes Incorporated	3.3 V	±5%	500 mW	900 mV @ 10 mA	-65 to 150°C	SOD-123	Active	Yes (AEC-Q101)
MMSZ4684-TP	Micro Commercial Co	3.3 V	±5%	500 mW	950 mV @ 10 mA	-55 to 150°C	SOD-123	Active	No

Engineering Selection Recommendations

For Standard Industrial Applications:

MMSZ4684T1G (onsemi) is the primary active equivalent. This part maintains identical electrical specifications to the obsolete MMSZ4684, carries active product status, and is available in Cut Tape and Digi-Reel packaging. MMSZ3V3T1G (onsemi) provides an alternative with identical specifications and Tape & Reel packaging.

For Automotive Applications Requiring AEC-Q101 Qualification:

SZMMSZ4684T1G (onsemi) or SZMMSZ3V3T1G (onsemi) are qualified automotive-grade equivalents with AEC-Q101 certification. DDZ9684Q-7 (Diodes Incorporated) provides an alternative automotive-qualified source with extended operating temperature range (-65°C to 150°C).

For Extended Temperature Range Requirements:

DDZ9684-7 and DDZ9684Q-7 (Diodes Incorporated) both support -65°C to 150°C operating temperature, providing 10°C lower minimum temperature specification compared to standard industrial parts.

For Alternative Manufacturer Sourcing:

MMSZ4684-TP (Micro Commercial Co) provides an active alternative from a different manufacturer. Forward voltage specification is 950 mV @ 10 mA, which is 50 mV higher than the original MMSZ4684 specification of 900 mV @ 10 mA. This part is suitable for applications where forward voltage tolerance permits this variation.

For High-Volume Availability:

SZMMSZ3V3T1G (onsemi) maintains the highest inventory level (300,300 pcs) among all active substitutes, followed by MMSZ5226BT1G (onsemi) with 224,400 pcs.

Frequently Asked Questions (FAQ)

Q: Can MMSZ4684T1G directly replace the obsolete MMSZ4684?

A: Yes. MMSZ4684T1G is an active equivalent with identical electrical specifications: 3.3 V nominal zener voltage, 500 mW maximum power, ±5% tolerance, 900 mV forward voltage @ 10 mA, and -55°C to 150°C operating temperature range. The primary difference is product status (active vs. obsolete) and packaging format (Cut Tape & Digi-Reel vs. standard packaging).

Q: What is the difference between MMSZ3V3T1G and MMSZ4684T1G?

A: Both parts are onsemi active equivalents with identical electrical specifications and SOD-123 packaging. The primary difference is the base product number designation (MMSZ3V3 vs. MMSZ4684). Both are suitable for direct substitution of the obsolete MMSZ4684.

Q: Are automotive-grade parts (SZMMSZ series) compatible with standard industrial designs?

A: Yes. Automotive-grade parts (SZMMSZ3V3T1G, SZMMSZ4684T1G, SZMMSZ5226BT1G) meet all electrical specifications of the original MMSZ4684 and carry AEC-Q101 qualification. These parts are fully compatible with standard industrial applications and provide additional qualification assurance.

Q: What is the significance of the "SZ" prefix in part numbers like SZMMSZ3V3T1G?

A: The "SZ" prefix indicates automotive-grade qualification (AEC-Q101). These parts undergo additional qualification testing and are suitable for automotive applications requiring certified components.

Q: Can DDZ9684-7 from Diodes Incorporated be used as a substitute?

A: Yes. DDZ9684-7 meets all electrical specifications of the MMSZ4684 and provides an extended operating temperature range (-65°C to 150°C vs. -55°C to 150°C). This part is active and available from an alternative manufacturer.

Q: What is the difference between DDZ9684-7 and DDZ9684Q-7?

A: Both parts are from Diodes Incorporated with identical electrical specifications and extended temperature range (-65°C to 150°C). DDZ9684Q-7 carries AEC-Q101 automotive qualification, while DDZ9684-7 does not. Both are active products.

Q: Is MMSZ4684-TP from Micro Commercial Co a suitable substitute?

A: MMSZ4684-TP is compatible with the MMSZ4684 for most applications. The forward voltage specification is 950 mV @ 10 mA compared to 900 mV @ 10 mA for the original part. This 50 mV difference must be evaluated against circuit design requirements. The part is active and available.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in three packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, and standard packaging. Selection depends on assembly equipment and production volume requirements. All parts use SOD-123 surface mount package.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed carry RoHS3 compliance status. The obsolete MMSZ4684 does not specify RoHS status in the provided data.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: All parts, including the original MMSZ4684 and all substitutes, carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

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