PZU33BA,115 Equivalent & Substitute Parts

Part Overview

The PZU33BA,115 is a 33 V Zener diode manufactured by Nexperia USA Inc., rated for 320 mW power dissipation in a surface mount SOD-323 package. This component is classified as Active and maintains full RoHS3 compliance. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage circuits across industrial, consumer, and automotive applications.

Equivalent and substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit operation within broader electrical parameter tolerances. The parts listed below provide functional alternatives based on matching or exceeding the core electrical characteristics of the PZU33BA,115.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	33	V
Tolerance	±5%	—
Power - Max	320	mW
Impedance (Max)	40	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 25 V	—
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 100 mA	—
Operating Temperature	-55°C ~ 150°C	—
Mounting Type	Surface Mount	—
Package / Case	SC-76, SOD-323	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the PZU33BA,115 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 33 V nominal
Package type: SOD-323 (SC-76) for direct PCB footprint compatibility
Tolerance: ±5% or ±6% acceptable for most applications
Power rating: Equal to or greater than 320 mW
RoHS3 compliance required for regulated markets

Secondary Compatibility Factors:

Operating temperature range: -55°C to 150°C minimum
Reverse leakage current: 50 nA to 100 nA @ specified voltage
Forward voltage: 900 mV to 1.1 V @ specified current
Impedance: 40 to 80 Ohms maximum

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (SOD-323 Package): Parts maintaining the SOD-323 package footprint with 33 V nominal zener voltage and power ratings from 200 mW to 320 mW. These provide pin-for-pin compatibility without PCB redesign.

Category B - Functional Alternatives (SOD-123 Package): Parts with 33 V nominal zener voltage in SOD-123 package. These require PCB layout modification but offer equivalent electrical performance. Included only when power rating and electrical specifications align with application requirements.

Parts with zener voltage deviating from 33 V (such as MMSZ4709-TP at 24 V) are listed for reference but do not constitute true substitutes for voltage-critical applications.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Package	Temp Range	RoHS Status	Product Status
PZU33BA,115	Nexperia USA Inc.	33 V	±5%	320 mW	40 Ω	SOD-323	-55°C ~ 150°C	ROHS3	Active
PZU33BA-QX	Nexperia USA Inc.	33 V	±5%	320 mW	40 Ω	SOD-323	-55°C ~ 150°C	ROHS3	Active
DDZ9714S-7	Diodes Incorporated	33 V	±5%	200 mW	—	SOD-323	-65°C ~ 150°C	ROHS3	Active
MM3Z33VT1G	onsemi	33 V	±6%	300 mW	80 Ω	SOD-323	-65°C ~ 150°C	ROHS3	Active
MMSZ5257BS-7-F	Diodes Incorporated	33 V	±5%	200 mW	58 Ω	SOD-323	-65°C ~ 150°C	ROHS3	Active
BZT52C33S-7-F	Diodes Incorporated	33 V	±6%	200 mW	80 Ω	SOD-323	-65°C ~ 150°C	ROHS3	Active
BZT52C33S-TP	Micro Commercial Co	33 V	±6%	200 mW	80 Ω	SOD-323	-65°C ~ 150°C	ROHS3	Active
BZT52C33-TP	Micro Commercial Co	33 V	±6%	200 mW	80 Ω	SOD-123	-65°C ~ 150°C	ROHS3	Active
BZT52C33-13	Diodes Incorporated	33 V	±6%	500 mW	80 Ω	SOD-123	-65°C ~ 150°C	RoHS Non-compliant	Discontinued
MMSZ5257B-TP	Micro Commercial Co	33 V	±5%	500 mW	58 Ω	SOD-123	-55°C ~ 150°C	ROHS3	Active
MMSZ4709-TP	Micro Commercial Co	24 V	±5%	500 mW	—	SOD-123	-55°C ~ 150°C	ROHS3	Active

Engineering Selection Recommendations

Tier 1 - Preferred Direct Substitutes (SOD-323, 33 V):

PZU33BA-QX (Nexperia USA Inc.) is the manufacturer-recommended equivalent. It maintains identical electrical specifications to the PZU33BA,115 with 33 V nominal zener voltage, ±5% tolerance, 320 mW power rating, and SOD-323 package. This part carries AEC-Q101 automotive qualification and is suitable for applications requiring automotive-grade reliability. Product status is Active with full RoHS3 compliance.

DDZ9714S-7 (Diodes Incorporated) provides a 33 V zener diode in SOD-323 package with ±5% tolerance and 200 mW power rating. While the power rating is lower than the primary part, the ±5% tolerance matches the PZU33BA,115 specification. This part is Active and RoHS3 compliant with extended temperature range (-65°C to 150°C). High inventory availability (79,929 units) supports supply continuity.

MM3Z33VT1G (onsemi) offers 33 V nominal zener voltage in SOD-323 package with 300 mW power rating and ±6% tolerance. Operating temperature range extends to -65°C. This part is Active and RoHS3 compliant. The 300 mW rating approaches the primary part specification.

MMSZ5257BS-7-F (Diodes Incorporated) provides 33 V zener voltage in SOD-323 package with ±5% tolerance and 200 mW power rating. Impedance is specified at 58 Ohms. This part is Active and RoHS3 compliant with extended temperature range.

Tier 2 - Functional Alternatives (SOD-323, 33 V, ±6% Tolerance):

BZT52C33S-7-F (Diodes Incorporated) and BZT52C33S-TP (Micro Commercial Co) both provide 33 V zener voltage in SOD-323 package with 200 mW power rating and ±6% tolerance. Both are Active and RoHS3 compliant. The ±6% tolerance represents a relaxation from the primary part specification but remains acceptable for non-critical voltage reference applications.

Tier 3 - Alternative Package Options (SOD-123, 33 V):

BZT52C33-TP (Micro Commercial Co) and MMSZ5257B-TP (Micro Commercial Co) provide 33 V zener voltage in SOD-123 package. These require PCB layout modification but offer higher power ratings (200 mW and 500 mW respectively). Both are Active and RoHS3 compliant. Selection depends on available PCB space and thermal dissipation requirements.

Parts to Avoid:

BZT52C33-13 (Diodes Incorporated) is marked as Discontinued at DiGi Electronics and carries RoHS non-compliance status. This part does not meet current regulatory requirements.

MMSZ4709-TP (Micro Commercial Co) operates at 24 V nominal zener voltage and is not a functional substitute for 33 V applications.

Frequently Asked Questions (FAQ)

Q: Can PZU33BA-QX replace PZU33BA,115 without PCB modification?

A: Yes. PZU33BA-QX maintains identical package (SOD-323), zener voltage (33 V), tolerance (±5%), and power rating (320 mW). Both parts use the same footprint and electrical specifications. No PCB redesign is required.

Q: What is the difference between SOD-323 and SOD-123 packages?

A: SOD-323 and SOD-123 are distinct surface mount package outlines with different physical dimensions and PCB footprints. Parts in SOD-123 package cannot be directly substituted for SOD-323 without PCB layout modification. SOD-123 packages are typically smaller but may have different thermal characteristics.

Q: Can I use a 200 mW rated part to replace a 320 mW rated part?

A: Substitution depends on circuit power dissipation requirements. If the circuit dissipates less than 200 mW in the zener diode, a 200 mW part is acceptable. If dissipation approaches or exceeds 200 mW, the lower power rating creates thermal stress and reduced component life. Verify actual power dissipation in your application before selecting a lower-rated substitute.

Q: Does ±6% tolerance substitute for ±5% tolerance?

A: ±6% tolerance is broader than ±5% tolerance. A ±6% part can replace a ±5% part in applications where voltage regulation tolerance is not critical. For precision voltage reference circuits, the tighter ±5% tolerance of the primary part is preferred. Verify application voltage tolerance requirements before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts in this document carry ROHS3 Compliant status except BZT52C33-13, which is marked RoHS non-compliant and Discontinued. For regulated markets and new designs, select only RoHS3 compliant parts.

Q: What is the significance of AEC-Q101 qualification on PZU33BA-QX?

A: AEC-Q101 is an automotive industry qualification standard. PZU33BA-QX carries this qualification, indicating suitability for automotive applications with enhanced reliability requirements. The primary part PZU33BA,115 does not list AEC-Q101 qualification. If automotive-grade reliability is required, PZU33BA-QX is the appropriate selection.

Q: Can I use DDZ9714S-7 in a high-power dissipation circuit?

A: DDZ9714S-7 is rated for 200 mW maximum power dissipation, compared to 320 mW for the primary part. In circuits where zener power dissipation exceeds 200 mW, this part operates beyond its rated specification and experiences accelerated degradation. Verify circuit power dissipation does not exceed 200 mW before selecting this part.

Q: What is the operating temperature range difference between parts?

A: The primary part PZU33BA,115 operates from -55°C to 150°C. Most substitute parts extend the lower temperature limit to -65°C, providing broader environmental coverage. This difference is not significant for most industrial applications but becomes relevant in extreme cold environments. Verify application temperature requirements before final part selection.

Q: Is inventory availability a factor in part selection?

A: Inventory levels are provided for reference. Parts with higher inventory (such as DDZ9714S-7 with 79,929 units) typically offer better supply continuity and shorter lead times. Parts with lower inventory may experience supply constraints. Consider both electrical compatibility and supply availability when making final selections.

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