BZX84J-B43,115 Equivalent & Substitute Parts

Part Overview

The BZX84J-B43,115 is an active-status Zener diode manufactured by Nexperia USA Inc., rated for 43 V nominal Zener voltage with 550 mW maximum power dissipation. This surface-mount component in SOD-323F packaging is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH requirements. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	43	V
Tolerance	±2%	—
Power - Max	550	mW
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 30.1 V	—
Voltage - Forward (Max) @ If	1.1 V @ 100 mA	—
Operating Temperature	-65 to 150	°C
Package / Case	SOD-323F	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution eligibility for the BZX84J-B43,115 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 43 V nominal
Operating temperature range: -65°C to 150°C minimum
Surface mount technology
RoHS3 compliance
REACH unaffected status

Secondary Compatibility Factors:

Package type: SOD-323F or equivalent mechanical footprint
Power dissipation capacity: minimum 150 mW (dependent on circuit application)
Voltage tolerance: ±2% to ±5% acceptable range
Reverse leakage current: 45 nA to 50 nA @ specified voltage

Substitute parts MM3Z43VB, MM3Z43VC, and DDZ9717T-7 meet the primary matching criteria. Differences in power rating, impedance, and tolerance are documented in the parameter comparison table to enable informed selection based on specific circuit requirements.

Parameter Comparison

Parameter	BZX84J-B43,115	MM3Z43VB	MM3Z43VC	DDZ9717T-7
Manufacturer	Nexperia USA Inc.	Fairchild Semiconductor	onsemi	Diodes Incorporated
Voltage - Zener (Nom)	43 V	43 V	43 V	43 V
Tolerance	±2%	±2%	±5%	±5%
Power - Max	550 mW	200 mW	200 mW	150 mW
Impedance (Max)	80 Ohms	141 Ohms	141 Ohms	—
Current - Reverse Leakage @ Vr	50 nA @ 30.1 V	45 nA @ 30.1 V	45 nA @ 30.1 V	50 nA @ 32.6 V
Voltage - Forward (Max) @ If	1.1 V @ 100 mA	1 V @ 10 mA	1 V @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C (TJ)
Package / Case	SOD-323F	SOD-323F	SOD-323F	SOD-523
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	—	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

BZX84J-B43,115 (Primary Part) Select this part when maximum power dissipation of 550 mW is required and automotive AEC-Q101 qualification is mandatory. The ±2% tolerance and 80 Ohm impedance specification provide tighter performance control. ROHS3 and REACH compliance are confirmed.

MM3Z43VB (Fairchild Semiconductor) This substitute provides ±2% tolerance matching and SOD-323F package compatibility. Power rating of 200 mW is suitable for lower-power applications. Impedance specification of 141 Ohms differs from the primary part. Active product status and standard compliance are confirmed.

MM3Z43VC (onsemi) This substitute offers SOD-323F package compatibility and active product status with ROHS3 and REACH compliance. The ±5% tolerance and 200 mW power rating represent a trade-off in precision and power capacity. Impedance specification of 141 Ohms differs from the primary part.

DDZ9717T-7 (Diodes Incorporated) This substitute provides the lowest power rating at 150 mW and operates within the required temperature range. The SOD-523 package differs mechanically from SOD-323F, requiring PCB layout verification. The ±5% tolerance and 900 mV forward voltage are documented. Active product status with ROHS3 and REACH compliance are confirmed.

Frequently Asked Questions (FAQ)

Q: Can DDZ9717T-7 be used as a direct replacement for BZX84J-B43,115?

A: DDZ9717T-7 matches the 43 V Zener voltage and operating temperature range. However, the SOD-523 package differs mechanically from the SOD-323F package of the primary part. PCB footprint and land pattern compatibility must be verified before substitution. Power dissipation capacity is reduced to 150 mW.

Q: What is the significance of the ±2% versus ±5% tolerance difference?

A: The BZX84J-B43,115 and MM3Z43VB specify ±2% tolerance, providing tighter Zener voltage control within 42.14 V to 43.86 V. The MM3Z43VC and DDZ9717T-7 specify ±5% tolerance, allowing Zener voltage variation within 40.85 V to 45.15 V. Circuit design margins determine whether the wider tolerance is acceptable.

Q: Are all substitute parts automotive-qualified?

A: The BZX84J-B43,115 carries AEC-Q101 automotive qualification. The substitute parts (MM3Z43VB, MM3Z43VC, DDZ9717T-7) do not list AEC-Q101 qualification in the provided specifications. Automotive applications requiring this qualification must use the primary part.

Q: How do impedance differences affect circuit performance?

A: The BZX84J-B43,115 specifies 80 Ohm maximum impedance. MM3Z43VB and MM3Z43VC specify 141 Ohm maximum impedance. Higher impedance results in increased voltage regulation ripple and slower transient response. Circuit design analysis is required to determine acceptability.

Q: What is the impact of reduced power dissipation in substitute parts?

A: The BZX84J-B43,115 is rated for 550 mW. MM3Z43VB and MM3Z43VC are rated for 200 mW, and DDZ9717T-7 is rated for 150 mW. Substitute parts are suitable only for applications where circuit power dissipation remains below the substitute part rating. Thermal analysis of the specific application is required.

Q: Can MM3Z43VB and MM3Z43VC be used interchangeably?

A: Both parts share the SOD-323F package and 43 V Zener voltage. MM3Z43VB specifies ±2% tolerance and 141 Ohm impedance. MM3Z43VC specifies ±5% tolerance and 141 Ohm impedance. Interchangeability depends on circuit tolerance requirements. Both are active products with ROHS3 and REACH compliance.

Q: What inventory considerations apply to these substitutes?

A: BZX84J-B43,115 has 3621 pieces in stock. MM3Z43VB has 3207 pieces, MM3Z43VC has 1120 pieces, and DDZ9717T-7 has 23300 pieces. Availability varies by substitute option.

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