BZX84J-B3V9,115 Equivalent & Substitute Parts

Part Overview

The BZX84J-B3V9,115 is a 3.9 V Zener diode manufactured by Nexperia USA Inc., rated for 550 mW maximum power dissipation in a surface mount SOD-323F package. This component is classified as Active product status and carries AEC-Q101 automotive qualification. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage applications across automotive and industrial electronics. Substitute parts are identified when equivalent electrical performance can be maintained within the allowed parameter tolerances while meeting application requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	3.9	V
Tolerance	±2%	—
Power - Maximum	550	mW
Impedance (Maximum)	90	Ohms
Current - Reverse Leakage @ 1 V	3	µA
Voltage - Forward (Maximum) @ 100 mA	1.1	V
Operating Temperature Range	-65 to 150	°C
Package / Case	SOD-323F	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitute parts for the BZX84J-B3V9,115 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Zener voltage nominal value: 3.9 V
Operating temperature range: -65°C to 150°C
Mounting type: Surface Mount
RoHS3 compliance and REACH unaffected status
Impedance maximum: 90 Ohms
Reverse leakage current: 3 µA @ 1 V

Allowable Variations:

Voltage tolerance: ±2% to ±5% acceptable
Power dissipation: 100 mW to 550 mW (application-dependent)
Package format: SOD-323F or SOD-523 (both surface mount, same footprint family)
Forward voltage: 900 mV to 1.1 V @ specified test current

Substitutes are grouped by power rating and tolerance class to enable selection based on specific circuit requirements.

Parameter Comparison

Parameter	BZX84J-B3V9,115	BZT52C3V9S-TP	BZT52C3V9T-7	BZT52C3V9T-TP	MM3Z3V9B	MM3Z3V9C
Manufacturer	Nexperia USA Inc.	Micro Commercial Co	Diodes Incorporated	Micro Commercial Co	onsemi	onsemi
Voltage - Zener (Nom)	3.9 V	3.9 V	3.9 V	3.9 V	3.9 V	3.9 V
Tolerance	±2%	±5%	±5%	±5%	±2%	±5%
Power - Max	550 mW	200 mW	300 mW	100 mW	200 mW	200 mW
Impedance (Max)	90 Ohms	90 Ohms	90 Ohms	90 Ohms	84 Ohms	84 Ohms
Current - Reverse Leakage @ 1 V	3 µA	3 µA	3 µA	3 µA	2.7 µA	2.7 µA
Operating Temperature	-65 to 150°C	-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-323	SOD-523	SOD-523	SOD-323F	SOD-323F
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

BZT52C3V9S-TP (Micro Commercial Co)

Suitable for applications requiring 200 mW maximum power dissipation
±5% tolerance acceptable where tighter ±2% specification is not mandated
SOD-323 package compatible with SOD-323F footprint requirements
Active product status with full RoHS3 compliance

BZT52C3V9T-7 (Diodes Incorporated)

Suitable for applications requiring 300 mW maximum power dissipation
±5% tolerance acceptable where tighter ±2% specification is not mandated
SOD-523 package requires PCB layout verification for footprint compatibility
Active product status with full RoHS3 compliance
Highest inventory availability among substitutes

BZT52C3V9T-TP (Micro Commercial Co)

Suitable for applications requiring 100 mW maximum power dissipation
±5% tolerance acceptable where tighter ±2% specification is not mandated
SOD-523 package requires PCB layout verification for footprint compatibility
Active product status with full RoHS3 compliance

MM3Z3V9B (onsemi)

Suitable for applications requiring 200 mW maximum power dissipation
±2% tolerance matches original specification
SOD-323F package provides direct footprint compatibility
Active product status with full RoHS3 compliance
Impedance of 84 Ohms is within acceptable range

MM3Z3V9C (onsemi)

Suitable for applications requiring 200 mW maximum power dissipation
±5% tolerance acceptable where tighter ±2% specification is not mandated
SOD-323F package provides direct footprint compatibility
Active product status with full RoHS3 compliance
Impedance of 84 Ohms is within acceptable range

Frequently Asked Questions (FAQ)

Q: Can BZT52C3V9S-TP replace BZX84J-B3V9,115 in all applications?

A: BZT52C3V9S-TP is suitable only for applications where maximum power dissipation does not exceed 200 mW. The original part is rated for 550 mW. If circuit design requires the full 550 mW capability, this substitute is not appropriate. The ±5% tolerance is acceptable where voltage regulation does not require the tighter ±2% specification.

Q: What is the difference between SOD-323F and SOD-523 packages?

A: Both are surface mount packages with different physical dimensions. SOD-323F is the original package for BZX84J-B3V9,115. SOD-523 is used in BZT52C3V9T-7 and BZT52C3V9T-TP. PCB layout and footprint compatibility must be verified before substitution. Consult package datasheets for exact dimensions.

Q: Are all substitute parts automotive-qualified?

A: The original BZX84J-B3V9,115 carries AEC-Q101 automotive qualification. The substitute parts listed do not explicitly state automotive qualification in the provided specifications. Application requirements for automotive use must be confirmed with manufacturer documentation.

Q: Which substitute offers the closest electrical match to the original part?

A: MM3Z3V9B provides the closest match with ±2% tolerance identical to the original specification and SOD-323F package compatibility. Power dissipation is reduced to 200 mW, which is acceptable for applications not requiring the full 550 mW capability.

Q: Can I use a substitute with lower power rating if my circuit only dissipates 150 mW?

A: Yes. Any substitute with maximum power rating equal to or greater than the actual circuit power dissipation is acceptable. For 150 mW dissipation, BZT52C3V9S-TP (200 mW), BZT52C3V9T-7 (300 mW), MM3Z3V9B (200 mW), and MM3Z3V9C (200 mW) are all suitable. BZT52C3V9T-TP (100 mW) is not suitable.

Q: What does ±2% versus ±5% tolerance mean for Zener voltage?

A: For a 3.9 V Zener diode, ±2% tolerance specifies the voltage range as 3.822 V to 3.978 V. ±5% tolerance specifies the range as 3.705 V to 4.095 V. Tighter tolerance (±2%) is required for precision voltage reference applications. Wider tolerance (±5%) is acceptable for general overvoltage protection circuits.

Q: Are all parts RoHS3 compliant?

A: Yes. All parts listed, including the original BZX84J-B3V9,115 and all substitutes, are ROHS3 compliant with MSL rating of 1 (Unlimited). All parts are REACH unaffected.

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