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

Part Overview

The MMSZ4684-TP is a surface mount Zener diode rated at 3.3 V nominal with 500 mW maximum power dissipation in SOD-123 package. Manufactured by Micro Commercial Co, this component is actively produced and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility. Alternative sources and variants are necessary to address supply chain requirements, packaging preferences, and application-specific certifications such as automotive qualification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±5%	—
Power - Max	500	mW
Current - Reverse Leakage @ Vr	7.5	µA @ 1.5 V
Voltage - Forward (Vf) (Max) @ If	950	mV @ 10 mA
Operating Temperature	-55 to 150	°C (TJ)
Package / Case	SOD-123	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMSZ4684-TP is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 3.3 V
Package / Case: SOD-123
Mounting Type: Surface Mount
Power - Max: 500 mW (or higher)
Tolerance: ±5% (or tighter)
Operating Temperature Range: -55°C to 150°C (or wider)

Substitution Categories:

Direct Equivalents maintain all primary electrical specifications and packaging. These parts are functionally interchangeable with identical voltage, power rating, tolerance, and temperature range.

Upgrade Equivalents provide equal or superior electrical performance with extended temperature range or enhanced specifications while maintaining the same voltage and package.

Similar Alternatives share the same voltage and package but may have reduced power ratings, different impedance characteristics, or modified reverse leakage specifications. These are suitable for applications with less stringent power requirements.

Reverse leakage current and forward voltage specifications vary among manufacturers but remain within acceptable ranges for general-purpose voltage regulation and protection applications.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Vf (Max) @ If	Ir @ Vr	Temp Range	Package	Status	Category
MMSZ4684-TP	Micro Commercial Co	3.3 V	±5%	500 mW	950 mV @ 10 mA	7.5 µA @ 1.5 V	-55 to 150°C	SOD-123	Active	Main Part
MMSZ4684T1G	onsemi	3.3 V	±5%	500 mW	900 mV @ 10 mA	7.5 µA @ 1.5 V	-55 to 150°C	SOD-123	Active	Direct Equivalent
MMSZ5226B-E3-08	Vishay General Semiconductor	3.3 V	±5%	500 mW	—	25 µA @ 1 V	-55 to 150°C	SOD-123	Active	Direct Equivalent
MMSZ5226BT1G	onsemi	3.3 V	±5%	500 mW	900 mV @ 10 mA	25 µA @ 1 V	-55 to 150°C	SOD-123	Active	Direct Equivalent
SZMMSZ4684T1G	onsemi	3.3 V	±5%	500 mW	900 mV @ 10 mA	7.5 µA @ 1.5 V	-55 to 150°C	SOD-123	Active	Direct Equivalent (Automotive)
DDZ9684-7	Diodes Incorporated	3.3 V	±5%	500 mW	900 mV @ 10 mA	7.5 µA @ 1.5 V	-65 to 150°C	SOD-123	Active	Upgrade Equivalent
BZT52C3V3-G3-08	Vishay General Semiconductor	3.3 V	±5%	410 mW	—	—	-55 to 150°C	SOD-123	Active	Similar Alternative
BZT52C3V3Q-7-F	Diodes Incorporated	3.3 V	±6.06%	370 mW	900 mV @ 10 mA	5 µA @ 1 V	-65 to 150°C	SOD-123	Active	Similar Alternative (Automotive)
MMSZ3V3T1G	onsemi	3.3 V	±5%	500 mW	900 mV @ 10 mA	5 µA @ 1 V	-55 to 150°C	SOD-123	Active	Similar Alternative
MMSZ4684T3G	onsemi	3.3 V	±5.15%	500 mW	900 mV @ 10 mA	7.5 µA @ 1.5 V	-65 to 150°C	SOD-123	Obsolete	Similar Alternative
MMSZ5226B-7-F	Diodes Incorporated	3.3 V	±5%	500 mW	900 mV @ 10 mA	25 µA @ 1 V	-65 to 150°C	SOD-123	Active	Direct Equivalent

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

MMSZ4684T1G, MMSZ5226B-E3-08, MMSZ5226BT1G, and MMSZ5226B-7-F are direct equivalents suitable for one-to-one substitution. All maintain 3.3 V nominal voltage, 500 mW power rating, ±5% tolerance, SOD-123 package, and -55°C to 150°C operating range. Selection among these parts depends on packaging format preference (Tape & Reel vs. Cut Tape) and manufacturer availability.

For Automotive Applications:

SZMMSZ4684T1G is qualified to AEC-Q101 automotive standard and carries automotive-grade designation. This part is recommended for automotive circuit protection and voltage regulation applications requiring formal qualification documentation.

For Extended Temperature Range:

DDZ9684-7 extends the lower operating temperature limit to -65°C while maintaining all other specifications. This part is suitable for applications requiring enhanced low-temperature performance.

For Reduced Power Requirements:

BZT52C3V3-G3-08 and BZT52C3V3Q-7-F are suitable alternatives when circuit design permits lower power dissipation (410 mW and 370 mW respectively). BZT52C3V3Q-7-F includes automotive qualification and extended temperature range (-65°C to 150°C).

For General-Purpose Applications:

MMSZ3V3T1G provides equivalent voltage and power specifications with alternative reverse leakage characteristics suitable for general-purpose voltage regulation.

All recommended parts are RoHS3 compliant, MSL Level 1, and actively produced except MMSZ4684T3G, which is obsolete and should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can MMSZ4684-TP be directly replaced with MMSZ4684T1G?

A: Yes. MMSZ4684T1G is a direct equivalent manufactured by onsemi with identical voltage (3.3 V), power rating (500 mW), tolerance (±5%), package (SOD-123), and operating temperature range (-55°C to 150°C). The primary difference is packaging format (Cut Tape & Digi-Reel vs. Tape & Reel) and forward voltage specification (900 mV vs. 950 mV), which does not affect substitutability.

Q: What is the difference between direct equivalents and similar alternatives?

A: Direct equivalents maintain the same voltage, power rating, tolerance, and temperature range as the MMSZ4684-TP. Similar alternatives share the same voltage and package but may have reduced power ratings (BZT52C3V3-G3-08 at 410 mW, BZT52C3V3Q-7-F at 370 mW) or different reverse leakage specifications. Similar alternatives are suitable only when circuit design accommodates the modified specifications.

Q: Is MMSZ4684T3G a suitable replacement?

A: MMSZ4684T3G is obsolete and should not be selected for new designs. Although it maintains equivalent electrical specifications, its discontinued status makes it unsuitable for production applications requiring long-term supply assurance.

Q: Which part should be selected for automotive applications?

A: SZMMSZ4684T1G is qualified to AEC-Q101 automotive standard and carries automotive-grade designation. For applications requiring extended temperature range and automotive qualification, BZT52C3V3Q-7-F is also available with AEC-Q101 qualification, though at reduced power rating (370 mW).

Q: What is the impact of different reverse leakage specifications?

A: Reverse leakage current varies among manufacturers: MMSZ4684-TP specifies 7.5 µA @ 1.5 V, while MMSZ5226 series specifies 25 µA @ 1 V. These variations remain within acceptable ranges for voltage regulation and protection applications. Selection depends on circuit requirements for leakage current performance.

Q: Can parts with lower power ratings substitute for the 500 mW MMSZ4684-TP?

A: BZT52C3V3-G3-08 (410 mW) and BZT52C3V3Q-7-F (370 mW) are suitable only when circuit design confirms that power dissipation does not exceed the lower rating. These parts are not recommended as direct replacements for applications requiring full 500 mW capability.

Q: What packaging options are available?

A: The MMSZ4684-TP is supplied in Tape & Reel (TR) format. Equivalent parts are available in Cut Tape (CT) & Digi-Reel format (MMSZ4684T1G, MMSZ5226BT1G, MMSZ4684T3G) or Tape & Reel format (MMSZ5226B-E3-08, SZMMSZ4684T1G, DDZ9684-7, BZT52C3V3-G3-08, BZT52C3V3Q-7-F, MMSZ3V3T1G, MMSZ5226B-7-F). Selection depends on assembly equipment compatibility and supply chain requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory status of the MMSZ4684-TP.

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