BZX84J-C43,115 Equivalent & Substitute Parts

Part Overview

The BZX84J-C43,115 is an automotive-grade Zener diode manufactured by Nexperia USA Inc., rated at 43 V nominal with 550 mW maximum power dissipation in a surface mount SOD-323F package. This component is actively produced and AEC-Q101 qualified for automotive applications. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within specified tolerance ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	43	V
Tolerance	±5%	-
Power - Max	550	mW
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 30.1 V	-
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 100 mA	-
Operating Temperature Range	-65 to 150	°C
Package / Case	SOD-323F	-
Mounting Type	Surface Mount	-
Grade	Automotive	-
Qualification	AEC-Q101	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of Zener diodes is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage (Vz) nominal value: 43 V
Operating temperature range: -65°C to 150°C minimum
Package type: SOD-323F or equivalent surface mount package
Mounting type: Surface Mount
RoHS compliance: ROHS3 Compliant

Secondary Compatibility Factors:

Tolerance range (±2% to ±5% acceptable)
Power dissipation rating (550 mW or higher)
Impedance characteristics (80 Ohms or lower)
Reverse leakage current specifications
Forward voltage characteristics

Substitute parts are classified into two categories:

Parametric Equivalents: Parts with identical or superior electrical specifications and the same package type (BZX84J-B43,115).

Similar Alternatives: Parts with the same Zener voltage and operating temperature range but different power ratings or package variants (DDZ9717T-7, MM3Z43VB, MM3Z43VC). These are suitable when power dissipation requirements are lower or when package footprint alternatives are acceptable.

Parameter Comparison

Parameter	BZX84J-C43,115	BZX84J-B43,115	DDZ9717T-7	MM3Z43VB	MM3Z43VC
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	Diodes Incorporated	Fairchild Semiconductor	onsemi
Voltage - Zener (Nom)	43 V	43 V	43 V	43 V	43 V
Tolerance	±5%	±2%	±5%	±2%	±5%
Power - Max	550 mW	550 mW	150 mW	200 mW	200 mW
Impedance (Max)	80 Ohms	80 Ohms	Not specified	141 Ohms	141 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 30.1 V	50 nA @ 30.1 V	50 nA @ 32.6 V	45 nA @ 30.1 V	45 nA @ 30.1 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 100 mA	1.1 V @ 100 mA	900 mV @ 10 mA	1 V @ 10 mA	1 V @ 10 mA
Operating Temperature	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C
Package / Case	SOD-323F	SOD-323F	SOD-523	SOD-323F	SOD-323F
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Grade	Automotive	Automotive	Not specified	Not specified	Not specified
Qualification	AEC-Q101	AEC-Q101	Not specified	Not specified	Not specified
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent):

BZX84J-B43,115 is a direct parametric equivalent to BZX84J-C43,115. Both components are manufactured by Nexperia USA Inc., share identical electrical specifications (43 V, 550 mW, SOD-323F), and carry AEC-Q101 automotive qualification. The primary difference is tolerance specification (±2% versus ±5%), which represents improved precision. This part is suitable for direct substitution in all applications where the original component is specified.

Alternative Substitutes (Lower Power Rating):

DDZ9717T-7, MM3Z43VB, and MM3Z43VC are suitable alternatives when power dissipation requirements do not exceed their respective maximum ratings (150 mW, 200 mW, and 200 mW). These parts maintain the 43 V Zener voltage and -65°C to 150°C operating temperature range. Selection among these alternatives depends on application power budget and package compatibility:

DDZ9717T-7 uses SOD-523 package (smaller footprint, lower power capacity)
MM3Z43VB and MM3Z43VC use SOD-323F package (same footprint as original)

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and EAR99 export classification. BZX84J-B43,115 is the only substitute with explicit automotive-grade designation and AEC-Q101 qualification matching the original component. For automotive applications requiring AEC-Q101 certification, BZX84J-B43,115 is the recommended substitute.

Frequently Asked Questions (FAQ)

Q: Can BZX84J-B43,115 replace BZX84J-C43,115 in all applications?

A: Yes. BZX84J-B43,115 is a parametric equivalent with identical voltage, power rating, package, and operating temperature specifications. The ±2% tolerance of BZX84J-B43,115 is tighter than the ±5% tolerance of BZX84J-C43,115, making it suitable for all applications where the original part is specified.

Q: What is the difference between the main part and DDZ9717T-7?

A: DDZ9717T-7 differs in three key aspects: (1) Power rating is 150 mW versus 550 mW, (2) Package is SOD-523 versus SOD-323F, and (3) Manufacturer is Diodes Incorporated versus Nexperia. The Zener voltage (43 V) and operating temperature range (-65°C to 150°C) are identical. DDZ9717T-7 is suitable only for applications with power dissipation below 150 mW and where SOD-523 package footprint is acceptable.

Q: Are MM3Z43VB and MM3Z43VC interchangeable with BZX84J-C43,115?

A: MM3Z43VB and MM3Z43VC share the same SOD-323F package and 43 V Zener voltage as BZX84J-C43,115. However, their maximum power rating is 200 mW, which is lower than the 550 mW rating of the original part. These parts are suitable substitutes only in applications where power dissipation does not exceed 200 mW. Both maintain the -65°C to 150°C operating temperature range.

Q: Which substitute part is recommended for automotive applications?

A: BZX84J-B43,115 is the recommended substitute for automotive applications. It carries AEC-Q101 qualification and automotive-grade designation, matching the original BZX84J-C43,115. Other substitute parts do not specify automotive qualification.

Q: What is the impact of tolerance differences between substitute parts?

A: Tolerance specifications define the acceptable variation in Zener voltage from the nominal 43 V value. BZX84J-C43,115 and DDZ9717T-7 have ±5% tolerance (41.85 V to 44.15 V range), while BZX84J-B43,115, MM3Z43VB, and MM3Z43VC have ±2% tolerance (42.14 V to 43.86 V range). Tighter tolerance (±2%) provides more precise voltage regulation. Application requirements determine whether the wider ±5% tolerance is acceptable.

Q: Can lower power-rated substitutes be used in high-power applications?

A: No. Using a substitute part with lower power rating in an application requiring higher power dissipation will result in component failure or degraded performance. Power dissipation must be calculated for the specific application circuit. If the application requires 550 mW dissipation, only BZX84J-C43,115 or BZX84J-B43,115 are suitable. Lower-rated alternatives (150 mW or 200 mW) are suitable only when application power dissipation is confirmed to be within their respective limits.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are ROHS3 compliant. BZX84J-B43,115, DDZ9717T-7, and MM3Z43VC explicitly specify ROHS3 compliance. MM3Z43VB does not specify RoHS status in the provided data.

Q: What package considerations apply when selecting substitutes?

A: BZX84J-C43,115, BZX84J-B43,115, MM3Z43VB, and MM3Z43VC use SOD-323F package with identical footprint and pin configuration. DDZ9717T-7 uses SOD-523 package, which has a different footprint and requires PCB layout modification. If PCB layout cannot be modified, DDZ9717T-7 is not suitable. For drop-in replacement without layout changes, select from parts using SOD-323F package.

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