MM5Z33VT1 Equivalent & Substitute Parts

Part Overview

The MM5Z33VT1 is a Zener diode rated at 33 V nominal voltage with 100 mW maximum power dissipation in a surface mount SOD-523 package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement. The MM5Z33VT1 is non-RoHS compliant, making active alternatives critical for applications requiring RoHS3 compliance. Substitute parts must maintain the 33 V zener voltage specification while accommodating variations in power rating, tolerance, and package form factor based on circuit requirements.

Key Parameters

Parameter	MM5Z33VT1	Unit
Voltage - Zener (Nom)	33	V
Tolerance	±6%	—
Power - Max	100	mW
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 23.2 V	—
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	—
Operating Temperature	-65°C ~ 150°C	—
Package / Case	SC-79, SOD-523	—
Product Status	Obsolete	—
RoHS Status	Non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MM5Z33VT1 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 33 V (exact match required)
Mounting Type: Surface Mount (all substitutes are surface mount)
Operating Temperature Range: -65°C ~ 150°C (minimum requirement)

Secondary Compatibility Factors:

Power - Max: Substitutes range from 150 mW to 550 mW; higher power ratings are acceptable for applications requiring the original 100 mW specification
Impedance (Max): 40 Ohms to 250 Ohms; variations acceptable based on circuit impedance requirements
Tolerance: ±2% to ±6%; tighter tolerances provide improved voltage regulation
Package / Case: SOD-523, SOD-323F, and 0603 packages available; package selection depends on PCB layout constraints

Compliance Considerations:

RoHS3 Compliance: All active substitutes are RoHS3 compliant, addressing the obsolete status of the MM5Z33VT1
Automotive Grade: Several substitutes carry AEC-Q100 or AEC-Q101 qualification for automotive applications

Substitutes are grouped by package type and power rating to facilitate selection based on specific application requirements.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Package	Status	RoHS
MM5Z33VT1	onsemi	33	±6%	100	80	SOD-523	Obsolete	Non-compliant
MM5Z33VT1G	onsemi	33	±6.1%	500	80	SOD-523	Active	RoHS3
BZT52H-C33,115	Nexperia USA Inc.	33	±5%	375	40	SOD-123F	Active	RoHS3
BZT585B33T-7	Diodes Incorporated	33	±2%	350	80	SOD-523	Active	RoHS3
BZX585-B33,115	Nexperia USA Inc.	33	±2%	300	80	SOD-523	Active	RoHS3
BZX585-C33,115	Nexperia USA Inc.	33	±5%	300	80	SOD-523	Active	RoHS3
BZX84J-B33,115	Nexperia USA Inc.	33	±2%	550	40	SOD-323F	Active	RoHS3
BZX84J-C33,115	Nexperia USA Inc.	33	±5%	550	40	SOD-323F	Active	RoHS3
CZRU52C33	Comchip Technology	33	±5%	150	80	0603/SOD-523F	Active	RoHS3
EDZVFHT2R33B	Rohm Semiconductor	33	±2.48%	150	250	SOD-523	Active	RoHS3
PZU33B,115	Nexperia USA Inc.	33	±5%	310	40	SOD-323F	Active	RoHS3

Engineering Selection Recommendations

Direct Replacement (Same Package - SOD-523):

MM5Z33VT1G is the primary direct replacement. It maintains the SOD-523 package and 80 Ohm impedance of the original part while providing 500 mW power rating and RoHS3 compliance. The tolerance specification of ±6.1% is equivalent to the original ±6%, ensuring compatibility with existing circuit designs.

BZT585B33T-7 and BZX585-B33,115 are SOD-523 alternatives with improved tolerance specifications (±2%) and active product status. Both maintain the 80 Ohm impedance and support the full -65°C to 150°C operating temperature range. BZT585B33T-7 offers 350 mW power rating, while BZX585-B33,115 provides 300 mW. These parts are suitable for applications requiring tighter voltage regulation.

BZX585-C33,115 provides 300 mW power rating with ±5% tolerance in the SOD-523 package, offering a middle ground between tolerance and power specifications.

Alternative Packages (Higher Power Density):

BZX84J-B33,115 and BZX84J-C33,115 are SOD-323F alternatives offering 550 mW power dissipation with reduced impedance (40 Ohms). These parts are qualified to AEC-Q101 automotive standards and support the full -65°C to 150°C operating temperature range. The SOD-323F package provides higher power density in a smaller footprint compared to SOD-523.

BZT52H-C33,115 is a SOD-123F alternative with 375 mW power rating and 40 Ohm impedance, qualified to AEC-Q101. This package is suitable for space-constrained applications.

PZU33B,115 is a SOD-323F alternative with 310 mW power rating and AEC-Q100 automotive qualification.

Lower Power Alternatives:

CZRU52C33 and EDZVFHT2R33B are 150 mW alternatives in compact packages. CZRU52C33 uses a 0603 package, while EDZVFHT2R33B uses an EMD2 package. These parts are suitable for applications with lower power dissipation requirements. EDZVFHT2R33B carries AEC-Q101 automotive qualification.

Compliance Status:

All substitute parts listed are RoHS3 compliant and carry active product status, addressing the obsolete classification of the MM5Z33VT1. Selection should prioritize parts with active status and appropriate automotive qualification (AEC-Q100 or AEC-Q101) for applications requiring such certifications.

Frequently Asked Questions (FAQ)

Q: Can MM5Z33VT1G be used as a direct replacement for MM5Z33VT1?

A: Yes. MM5Z33VT1G maintains the same 33 V zener voltage, SOD-523 package, 80 Ohm impedance, and -65°C to 150°C operating temperature range. The tolerance specification of ±6.1% is equivalent to the original ±6%. The primary difference is the increased power rating (500 mW versus 100 mW) and RoHS3 compliance. Higher power rating does not prevent use in applications designed for 100 mW operation.

Q: What is the difference between SOD-523 and SOD-323F packages?

A: SOD-523 and SOD-323F are both surface mount packages for zener diodes. SOD-323F (also designated SC-90) is physically larger than SOD-523 (also designated SC-79) and typically accommodates higher power dissipation. Package selection depends on PCB layout constraints and available board space. Both packages are compatible with standard surface mount assembly processes.

Q: Why do some substitutes have lower power ratings than the original MM5Z33VT1?

A: CZRU52C33 and EDZVFHT2R33B are rated at 150 mW, which is higher than the original 100 mW specification. These parts are suitable for applications where the original 100 mW rating is sufficient. Lower power ratings indicate reduced thermal dissipation capability and should only be selected if circuit current requirements do not exceed the part's maximum power specification.

Q: What does AEC-Q100 and AEC-Q101 qualification mean?

A: AEC-Q100 and AEC-Q101 are automotive qualification standards. AEC-Q100 applies to discrete semiconductors, while AEC-Q101 applies to optoelectronic devices. Parts carrying these qualifications have undergone rigorous testing for automotive applications and are suitable for use in automotive circuits. Selection of qualified parts is required for automotive applications.

Q: Can I use a substitute with tighter tolerance (±2%) in place of the original ±6% part?

A: Yes. Tighter tolerance specifications (±2%) provide improved voltage regulation and are fully compatible with applications designed for ±6% tolerance. The tighter tolerance represents an improvement in performance and does not introduce compatibility issues.

Q: What is the significance of impedance (Zzt) variation among substitutes?

A: Impedance (Zzt) affects the dynamic response of the zener diode under changing load conditions. Variations from 40 Ohms to 250 Ohms are acceptable for most applications. Lower impedance values (40 Ohms) provide better transient response, while higher impedance values (250 Ohms) are acceptable for applications with stable load conditions. Circuit simulation or testing may be required to confirm impedance compatibility for critical applications.

Q: Are all listed substitutes in active production?

A: Yes. All substitute parts listed carry active product status, ensuring long-term availability and supply chain stability. The original MM5Z33VT1 is classified as obsolete and should be replaced with an active alternative for new designs and ongoing procurement.

Q: What is the operating temperature range requirement for my application?

A: The original MM5Z33VT1 supports -65°C to 150°C operation. All listed substitutes support this range or a subset thereof. CZRU52C33 operates from -55°C to 125°C, which is narrower than the original specification. Verify that the selected substitute meets the minimum and maximum operating temperature requirements of your application.

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