MM5Z3V3ST1 Equivalent & Substitute Parts

Part Overview

The MM5Z3V3ST1 is a Zener diode rated at 3.3 V nominal voltage with 200 mW maximum power dissipation, manufactured by onsemi in the SOD-523 surface mount package. This component is classified as obsolete, indicating that onsemi has discontinued production. Locating equivalent or substitute parts is necessary to support ongoing design requirements, maintenance operations, and production continuity for applications utilizing this Zener diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±3%	—
Power - Max	200	mW
Impedance (Max)	95	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-523	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitute parts for the MM5Z3V3ST1 are identified based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage: 3.3 V nominal
Operating temperature range: -65°C to 150°C
Mounting type: Surface Mount
Impedance (Max): 95 Ohms
Current - Reverse Leakage @ Vr: 5 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA

Secondary Considerations:

Power rating: 200 mW or higher
Tolerance: ±3% or tighter
Package compatibility: SOD-523 or equivalent footprint

Two substitute parts meet these criteria with varying degrees of parameter alignment and product status availability.

Parameter Comparison

Parameter	MM5Z3V3ST1 (Main)	MM3Z3V3T1G (Substitute)	BZT52C3V3T-TP (Substitute)
Manufacturer	onsemi	onsemi	Micro Commercial Co
Voltage - Zener (Nom)	3.3 V	3.3 V	3.3 V
Tolerance	±3%	±6%	±2%
Power - Max	200 mW	300 mW	200 mW
Impedance (Max)	95 Ohms	95 Ohms	95 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 1 V	5 µA @ 1 V	Not specified
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	Not specified
Operating Temperature Range	-65°C to 150°C	-65°C to 150°C	-65°C to 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-523	SOD-323	SOD-523
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MM3Z3V3T1G (onsemi): This substitute offers higher power dissipation capability (300 mW versus 200 mW), providing additional thermal margin in applications. The part is manufactured by the same original equipment manufacturer (onsemi) and maintains identical impedance and forward voltage characteristics. However, the tolerance specification is wider (±6% versus ±3%), which may impact voltage regulation precision in sensitive applications. The package differs from the original (SOD-323 versus SOD-523), requiring PCB layout modification. The part carries ROHS3 compliance and active product status, ensuring long-term availability and supply chain stability.

BZT52C3V3T-TP (Micro Commercial Co): This substitute maintains identical electrical specifications to the MM5Z3V3ST1, including 200 mW power rating, SOD-523 package compatibility, and operating temperature range. The tolerance specification is superior (±2% versus ±3%), offering tighter voltage regulation. The part is manufactured by Micro Commercial Co and carries ROHS3 compliance with active product status. No PCB layout modification is required due to package compatibility. Reverse leakage current and forward voltage specifications are not provided in the available data.

Both substitute parts are actively produced and RoHS3 compliant, addressing the obsolescence status of the original MM5Z3V3ST1 component.

Frequently Asked Questions (FAQ)

Q: Can MM3Z3V3T1G be used as a direct replacement for MM5Z3V3ST1?

A: Electrical substitution is possible due to matching Zener voltage (3.3 V), impedance (95 Ohms), and operating temperature range. However, the package differs (SOD-323 versus SOD-523), requiring PCB footprint redesign. The higher power rating (300 mW) and wider tolerance (±6%) must be evaluated against application requirements.

Q: What are the package differences between SOD-523 and SOD-323?

A: SOD-523 and SOD-323 are distinct surface mount packages with different physical dimensions and land patterns. SOD-323 is larger than SOD-523. Direct PCB substitution without layout modification is not possible between these packages.

Q: Is BZT52C3V3T-TP a pin-compatible replacement?

A: Yes. BZT52C3V3T-TP uses the SOD-523 package, matching the original MM5Z3V3ST1 footprint. No PCB layout modification is required for package compatibility.

Q: How does tolerance affect circuit performance?

A: Zener diode tolerance specifies the accuracy of the nominal voltage. MM5Z3V3ST1 tolerance of ±3% means the actual Zener voltage ranges from 3.201 V to 3.399 V. BZT52C3V3T-TP tolerance of ±2% provides a narrower range (3.234 V to 3.366 V), while MM3Z3V3T1G tolerance of ±6% provides a wider range (3.102 V to 3.498 V). Applications requiring precise voltage regulation benefit from tighter tolerance specifications.

Q: Why is the MM5Z3V3ST1 marked as obsolete?

A: Obsolete status indicates that onsemi has discontinued production of this component. Substitute parts with active product status ensure continued availability and supply chain reliability for new designs and ongoing production requirements.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both MM3Z3V3T1G and BZT52C3V3T-TP carry ROHS3 compliance certification, whereas the original MM5Z3V3ST1 is RoHS non-compliant. This compliance status is relevant for applications subject to RoHS regulatory requirements.

Q: What is the inventory status of these substitute parts?

A: MM3Z3V3T1G has 125,200 pieces in stock, and BZT52C3V3T-TP has 5,826 pieces in stock, both indicating active availability in the supply chain.

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