MM3Z33VT1 Equivalent & Substitute Parts

Part Overview

The MM3Z33VT1 is a Zener diode rated at 33 V nominal voltage with 200 mW maximum power dissipation in a surface mount SOD-323 package. Manufactured by onsemi, this component is classified as obsolete product status. Due to its obsolete designation, equivalent and substitute parts with active product status are necessary for new designs and ongoing production requirements. Substitute components must maintain the core electrical specifications: 33 V Zener voltage, ±6% tolerance, 200 mW power rating, and SOD-323 surface mount packaging.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	33	V
Tolerance	±6%	—
Power - Max	200	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	—
Mounting Type	Surface Mount	—
Package / Case	SC-76, SOD-323	—

Substitute Part Grouping Explanation

Substitution of the MM3Z33VT1 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 33 V nominal
Tolerance: ±6% or tighter (±5% acceptable)
Power rating: 200 mW minimum (higher ratings acceptable for derating applications)
Package: SOD-323 surface mount
Impedance: 80 Ohms maximum
Operating temperature range: -65°C to 150°C minimum

Substitution Categories:

Direct Equivalent (Parametric Match): Parts matching all electrical specifications and package requirements with active product status.

Similar Equivalent (Relaxed Parameters): Parts with identical Zener voltage and package but with improved specifications (higher power rating, tighter tolerance, or enhanced performance characteristics) that maintain functional compatibility.

Cross-Manufacturer Alternatives: Parts from different manufacturers meeting the same electrical and mechanical requirements, suitable for multi-source procurement strategies.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Package	Status	RoHS
MM3Z33VT1	onsemi	33	±6%	200	80	SOD-323	Obsolete	Non-compliant
MM3Z33VT1G	onsemi	33	±6%	300	80	SOD-323	Active	ROHS3 Compliant
MM3Z33VT3G	onsemi	33	±6%	200	80	SOD-323	Active	ROHS3 Compliant
BZX384-C33,115	Nexperia USA Inc.	33	±5%	300	80	SOD-323	Active	ROHS3 Compliant
CZRF52C33	Comchip Technology	33	±5%	200	80	1005/SOD-323F	Active	ROHS3 Compliant
PZU33BA,115	Nexperia USA Inc.	33	±5%	320	40	SOD-323	Active	ROHS3 Compliant
BZT52C33S-7-F	Diodes Incorporated	33	±6%	200	80	SOD-323	Active	ROHS3 Compliant
BZT52C33S-TP	Micro Commercial Co	33	±6%	200	80	SOD-323	Active	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitutes:

MM3Z33VT3G (onsemi): This part provides parametric equivalence to the MM3Z33VT1 with identical electrical specifications (33 V, ±6%, 200 mW, 80 Ohms impedance) and SOD-323 packaging. Active product status and ROHS3 compliance make this the preferred direct replacement. Tape & Reel packaging supports automated assembly processes.

BZT52C33S-7-F (Diodes Incorporated): Parametric equivalent with matching voltage, tolerance, power rating, and impedance. Active status and ROHS3 compliance ensure long-term availability. Cross-manufacturer sourcing provides supply chain redundancy.

BZT52C33S-TP (Micro Commercial Co): Identical electrical specifications to MM3Z33VT1 with active product status and ROHS3 compliance. Supports multi-source procurement strategies.

Secondary Substitutes for Derating Applications:

MM3Z33VT1G (onsemi): Higher power rating (300 mW) allows operation at reduced stress levels. Maintains all other specifications and offers improved thermal margin. ROHS3 compliant with active status.

BZX384-C33,115 (Nexperia USA Inc.): 300 mW power rating with tighter tolerance (±5%) provides enhanced performance margin. Active status and ROHS3 compliance confirmed.

PZU33BA,115 (Nexperia USA Inc.): 320 mW power rating with improved impedance (40 Ohms) for lower dynamic resistance. Suitable for applications requiring enhanced current handling. ROHS3 compliant.

Not Recommended:

CZRF52C33 (Comchip Technology): Different package designation (1005/SOD-323F) and reduced operating temperature range (-55°C to 125°C versus -65°C to 150°C) limit compatibility with designs requiring full temperature specification.

Frequently Asked Questions (FAQ)

Q: Can MM3Z33VT1G be used as a direct replacement for MM3Z33VT1?

A: Yes. MM3Z33VT1G maintains identical Zener voltage (33 V), tolerance (±6%), impedance (80 Ohms), and SOD-323 packaging. The higher power rating (300 mW versus 200 mW) provides additional thermal margin without affecting circuit function. Active product status and ROHS3 compliance make this the preferred onsemi equivalent.

Q: What is the difference between MM3Z33VT3G and MM3Z33VT1G?

A: MM3Z33VT3G matches the original MM3Z33VT1 power specification (200 mW) while MM3Z33VT1G provides 300 mW. Both maintain 33 V Zener voltage, ±6% tolerance, 80 Ohms impedance, and SOD-323 packaging. Selection depends on thermal design requirements and available board space for heat dissipation.

Q: Are cross-manufacturer parts (BZT52C33S-7-F, BZX384-C33,115) fully compatible?

A: Yes. These parts meet or exceed the electrical specifications of MM3Z33VT1: 33 V Zener voltage, SOD-323 packaging, and required impedance characteristics. All are ROHS3 compliant with active product status. Cross-manufacturer sourcing reduces supply chain risk.

Q: Why is CZRF52C33 not recommended as a primary substitute?

A: CZRF52C33 uses a different package designation (1005/SOD-323F) and has a reduced operating temperature range (-55°C to 125°C) compared to the original specification (-65°C to 150°C). These differences may cause compatibility issues with existing PCB layouts and limit operation in extended temperature applications.

Q: What does ±5% tolerance mean compared to ±6%?

A: ±5% tolerance (BZX384-C33,115, CZRF52C33, PZU33BA,115) provides tighter Zener voltage control than ±6% (MM3Z33VT1, MM3Z33VT3G, BZT52C33S-7-F, BZT52C33S-TP). Both tolerances are acceptable for substitution; tighter tolerance offers improved voltage regulation performance.

Q: Can PZU33BA,115 replace MM3Z33VT1 in all applications?

A: PZU33BA,115 maintains 33 V Zener voltage and SOD-323 packaging with improved specifications (320 mW power, ±5% tolerance, 40 Ohms impedance). The lower impedance provides better current handling. Functional compatibility is confirmed; verify thermal design accommodates the higher power rating if needed.

Q: What is the significance of impedance (Zzt) specifications?

A: Impedance (Zzt) represents dynamic resistance and affects voltage regulation quality. Lower impedance (40 Ohms for PZU33BA,115) provides better voltage stability under load changes. The 80 Ohms specification of MM3Z33VT1 and most equivalents is standard for this voltage class and ensures adequate regulation performance.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes. All recommended substitute parts are supplied in Tape & Reel (TR) packaging, suitable for automated pick-and-place assembly. This packaging format matches the original MM3Z33VT1 production requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message