BZX585-C33,115 Equivalent & Substitute Parts

Part Overview

The BZX585-C33,115 is a 33 V, 300 mW Zener diode manufactured by Nexperia USA Inc. in SOD-523 surface mount package. This component is classified as Active product status and meets automotive-grade requirements with AEC-Q100 qualification. The device operates across a temperature range of -65°C to 150°C with ±5% voltage tolerance and ROHS3 compliance.

Equivalent and substitute parts are identified when design requirements permit variations in power dissipation, package form factor, voltage tolerance, or when alternative manufacturers provide functionally compatible solutions for the same 33 V Zener voltage specification.

Key Parameters

Parameter	BZX585-C33,115
Voltage - Zener (Nom)	33 V
Tolerance	±5%
Power - Max	300 mW
Impedance (Max)	80 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 23.1 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 100 mA
Operating Temperature	-65°C ~ 150°C
Package / Case	SC-79, SOD-523
Grade	Automotive
Qualification	AEC-Q100
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution relationships for the BZX585-C33,115 are established based on the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 33 V (nominal)
Operating temperature range: -65°C to 150°C minimum
Surface mount package compatibility: SOD-523 or equivalent form factor
Power dissipation capability: 300 mW or greater
Voltage tolerance: ±5% or tighter

Parametric Equivalent Classification: Parts meeting all primary criteria with identical or superior electrical specifications and automotive qualification are classified as parametric equivalents. These include BZX585-B33,115 (tighter ±2% tolerance) and CMOZ33V TR PBFREE (identical specifications, alternative manufacturer).

Direct Manufacturer Equivalent Classification: Parts with the same 33 V Zener voltage and SOD-523 package but with higher power rating (500 mW) are classified as direct equivalents with enhanced capability. MM5Z33VT1G from onsemi provides increased power dissipation margin.

Similar Part Classification: Parts with 33 V Zener voltage but reduced power ratings (150-200 mW), alternative package forms (SOD-323F, 0603), or modified operating temperature ranges are classified as similar alternatives. These include CZRU52C33, DDZ9714T-7, EDZVFHT2R33B, MM3Z33VB, and MM3Z33VC. These parts are suitable for applications where power dissipation requirements are lower or package constraints differ.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Zener (Nom)	Tolerance	Power - Max	Impedance (Max)	Operating Temperature	Package / Case	Grade	Qualification
BZX585-C33,115	Nexperia USA Inc.	33 V	±5%	300 mW	80 Ohms	-65°C ~ 150°C	SC-79, SOD-523	Automotive	AEC-Q100
BZX585-B33,115	Nexperia USA Inc.	33 V	±2%	300 mW	80 Ohms	-65°C ~ 150°C	SC-79, SOD-523	Automotive	AEC-Q100
MM5Z33VT1G	onsemi	33 V	±6.1%	500 mW	80 Ohms	-65°C ~ 150°C	SC-79, SOD-523	—	—
CMOZ33V TR PBFREE	Central Semiconductor Corp	33 V	±5%	300 mW	80 Ohms	-65°C ~ 150°C	SC-79, SOD-523	—	—
CZRU52C33	Comchip Technology	33 V	±5%	150 mW	80 Ohms	-55°C ~ 125°C	2-SMD, No Lead (0603/SOD-523F)	—	—
DDZ9714T-7	Diodes Incorporated	33 V	±5%	150 mW	—	-65°C ~ 150°C	SC-79, SOD-523	—	—
EDZVFHT2R33B	Rohm Semiconductor	33 V	±2.48%	150 mW	250 Ohms	-65°C ~ 150°C (TJ)	SC-79, SOD-523 (EMD2)	Automotive	AEC-Q101
MM3Z33VB	onsemi	33 V	±2%	200 mW	75 Ohms	-65°C ~ 150°C	SC-90, SOD-323F	—	—
MM3Z33VC	Fairchild Semiconductor	33 V	±5%	200 mW	75 Ohms	-65°C ~ 150°C	SC-90, SOD-323F	—	—

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): BZX585-B33,115 from Nexperia USA Inc. provides direct substitution with improved voltage tolerance (±2% versus ±5%). Both parts maintain automotive-grade classification with AEC-Q100 qualification, identical power rating of 300 mW, and SOD-523 package compatibility. This part is suitable when tighter voltage tolerance is beneficial.

CMOZ33V TR PBFREE from Central Semiconductor Corp matches all electrical and thermal specifications of the BZX585-C33,115 with identical 300 mW power rating and ±5% tolerance. This part provides an alternative source from a different manufacturer while maintaining full compatibility.

For Enhanced Power Capability: MM5Z33VT1G from onsemi provides 500 mW power dissipation in the same SOD-523 package and 33 V Zener voltage. This part is suitable for applications requiring higher power margin or thermal headroom. Operating temperature range matches the original specification (-65°C to 150°C).

For Reduced Power Applications: DDZ9714T-7 from Diodes Incorporated, CZRU52C33 from Comchip Technology, and EDZVFHT2R33B from Rohm Semiconductor are suitable when circuit design permits lower power dissipation (150 mW). DDZ9714T-7 maintains the full -65°C to 150°C operating range and SOD-523 package. EDZVFHT2R33B provides automotive-grade AEC-Q101 qualification with tighter ±2.48% tolerance. CZRU52C33 operates within -55°C to 125°C range with 0603 package form factor.

For Alternative Package Configurations: MM3Z33VB and MM3Z33VC from onsemi and Fairchild Semiconductor respectively provide 200 mW power rating in SOD-323F package. These parts are suitable for space-constrained designs where the smaller package form factor is required. Both maintain -65°C to 150°C operating range with 33 V Zener voltage.

Compliance Considerations: All listed parts maintain ROHS3 compliance and REACH unaffected status. Automotive applications requiring AEC-Q100 qualification should prioritize BZX585-C33,115, BZX585-B33,115, or EDZVFHT2R33B (AEC-Q101).

Frequently Asked Questions (FAQ)

Q: Can BZX585-B33,115 be used as a direct replacement for BZX585-C33,115?

A: Yes. BZX585-B33,115 is a parametric equivalent with identical electrical specifications except for tighter voltage tolerance (±2% versus ±5%). Both parts share the same 33 V Zener voltage, 300 mW power rating, SOD-523 package, -65°C to 150°C operating range, and automotive AEC-Q100 qualification. The improved tolerance of the B-grade variant provides enhanced voltage accuracy.

Q: What is the difference between MM5Z33VT1G and the original BZX585-C33,115?

A: MM5Z33VT1G provides higher power dissipation capability (500 mW versus 300 mW) while maintaining the same 33 V Zener voltage, SOD-523 package, and -65°C to 150°C operating temperature range. The tolerance is ±6.1% compared to ±5%. This part is suitable for applications requiring additional thermal margin or higher power handling.

Q: Can I use MM3Z33VB or MM3Z33VC in place of BZX585-C33,115?

A: These parts are suitable only if circuit design permits reduced power dissipation. MM3Z33VB and MM3Z33VC provide 200 mW maximum power (versus 300 mW) and use SOD-323F package instead of SOD-523. Both maintain 33 V Zener voltage and -65°C to 150°C operating range. Physical package size differs, requiring PCB layout modification.

Q: Is CMOZ33V TR PBFREE suitable for automotive applications?

A: CMOZ33V TR PBFREE matches all electrical specifications of BZX585-C33,115 and maintains ROHS3 compliance. However, automotive-grade certification is not specified for this part. For applications requiring AEC-Q100 qualification, BZX585-C33,115 or BZX585-B33,115 are required.

Q: What are the operating temperature limitations when selecting a substitute?

A: The original BZX585-C33,115 operates from -65°C to 150°C. Substitute parts must maintain this range or provide a superset. CZRU52C33 operates within -55°C to 125°C, which is a reduced range unsuitable for applications requiring full -65°C to 150°C coverage. All other listed substitutes maintain or exceed the original temperature specification.

Q: Can DDZ9714T-7 replace BZX585-C33,115 in all applications?

A: DDZ9714T-7 is suitable for applications where 150 mW power dissipation is sufficient. It maintains 33 V Zener voltage, SOD-523 package, -65°C to 150°C operating range, and ±5% tolerance. However, reduced power rating (150 mW versus 300 mW) limits its use to lower-power circuits. Verify circuit power requirements before substitution.

Q: What package compatibility issues should I consider?

A: BZX585-C33,115 uses SOD-523 package. Direct substitutes BZX585-B33,115, MM5Z33VT1G, DDZ9714T-7, and CMOZ33V TR PBFREE maintain SOD-523 compatibility without PCB modification. MM3Z33VB and MM3Z33VC use SOD-323F package, requiring PCB layout changes. CZRU52C33 uses 0603 package, also requiring layout modification.

Q: Are there inventory considerations for substitute selection?

A: Inventory levels vary by part. BZX585-C33,115 has 4108 units in stock. BZX585-B33,115 has 3418 units. MM5Z33VT1G has 3300 units. CMOZ33V TR PBFREE has 39595 units (highest availability). DDZ9714T-7 has 75300 units. Availability should be verified for production requirements.

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