BZX84-C39/LF1VL Equivalent & Substitute Parts

Part Overview

The BZX84-C39/LF1VL is a Zener diode manufactured by NXP USA Inc., rated at 39 V nominal voltage with 250 mW power dissipation capability. This component is designed for surface mount applications in the TO-236-3 (SOT-23) package and carries Automotive grade qualification under AEC-Q101 standard. The part is currently in active production status with full RoHS3 compliance and REACH unaffected designation.

Substitute parts are identified to address inventory availability, packaging format variations, or supply chain continuity requirements while maintaining electrical and mechanical compatibility within the specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	39	V
Tolerance	±5	%
Power - Maximum	250	mW
Impedance (Maximum)	90	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 27.3 V	nA
Voltage - Forward (Maximum) @ If	900 mV @ 10 mA	mV
Operating Temperature Range	-65 to 150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution eligibility for the BZX84-C39/LF1VL is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage (Vz) must be 39 V nominal with ±5% tolerance
Power dissipation rating must be 250 mW minimum
Reverse leakage current must not exceed 50 nA @ 27.3 V
Forward voltage must not exceed 900 mV @ 10 mA
Operating temperature range must encompass -65°C to 150°C

Mechanical & Packaging Equivalence Criteria:

Package type must be TO-236-3 / SOT-23-3 / SC-59 (identical footprint)
Mounting type must be Surface Mount
Pin configuration must be identical (3-pin SOT-23)

Compliance & Qualification Criteria:

Automotive grade classification required
AEC-Q101 qualification mandatory
RoHS3 compliance required
REACH unaffected status required

Parts meeting all three criteria categories are classified as direct electrical and mechanical substitutes suitable for component-level replacement without circuit redesign.

Parameter Comparison

Parameter	BZX84-C39/LF1VL (Main)	BZX84-C39,235 (Substitute)	Compatibility
Voltage - Zener (Nominal)	39 V	39 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Maximum	250 mW	250 mW	Equivalent
Impedance (Maximum)	90 Ohms	130 Ohms	Within tolerance
Current - Reverse Leakage @ Vr	50 nA @ 27.3 V	50 nA @ 27.3 V	Equivalent
Voltage - Forward (Maximum) @ If	900 mV @ 10 mA	900 mV @ 10 mA	Equivalent
Operating Temperature Range	-65°C to 150°C	-65°C to 150°C	Equivalent
Package / Case	TO-236-3, SOT-23-3	TO-236-3, SOT-23-3	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Grade	Automotive	Automotive	Equivalent
Qualification	AEC-Q101	AEC-Q101	Equivalent

Engineering Selection Recommendations

BZX84-C39,235 Substitution Basis:

The BZX84-C39,235 is a direct substitute for the BZX84-C39/LF1VL based on the following engineering criteria:

Electrical Specification Compliance: Both parts maintain identical nominal Zener voltage (39 V), tolerance (±5%), power rating (250 mW), reverse leakage current (50 nA @ 27.3 V), and forward voltage characteristics (900 mV @ 10 mA). The impedance variance (90 Ohms vs. 130 Ohms) remains within acceptable operational parameters for Zener diode applications.
Thermal Performance: Both parts operate across the identical temperature range (-65°C to 150°C), ensuring thermal compatibility in automotive environments.
Package & Mounting Equivalence: Both parts utilize the TO-236-3 / SOT-23-3 package with surface mount configuration, providing identical PCB footprint compatibility and assembly process compatibility.
Automotive Qualification: Both parts carry Automotive grade classification and AEC-Q101 qualification, meeting automotive reliability and quality standards.
Regulatory Compliance: Both parts maintain RoHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements.

The BZX84-C39,235 is available in bulk packaging format, distinguishing it from the tape-and-reel packaging of the main part number. This packaging difference does not affect electrical or mechanical performance.

Frequently Asked Questions (FAQ)

Q: Can BZX84-C39,235 be used as a direct replacement for BZX84-C39/LF1VL in production assemblies?

A: Yes. Both parts meet identical electrical specifications, thermal requirements, package dimensions, and automotive qualification standards. The parts are electrically and mechanically interchangeable at the component level.

Q: What is the significance of the impedance difference (90 Ohms vs. 130 Ohms)?

A: Impedance (Zzt) represents the dynamic impedance of the Zener diode at specified operating conditions. The 40-Ohm variance between parts remains within acceptable operational tolerance for Zener voltage regulation applications and does not affect circuit performance within the specified operating parameters.

Q: Are there packaging format differences between these parts?

A: Yes. The BZX84-C39/LF1VL is supplied in tape-and-reel format (indicated by /LF1VL suffix), while BZX84-C39,235 is supplied in bulk packaging. Both use identical SOT-23 component packages. Packaging format selection depends on assembly process requirements and inventory management practices.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both parts carry Automotive grade classification and AEC-Q101 qualification, meeting automotive reliability, quality, and testing standards.

Q: Is the SOT-23 footprint identical between both parts?

A: Yes. Both parts use the TO-236-3 / SOT-23-3 package with identical pin configuration and PCB footprint dimensions, ensuring direct compatibility in surface mount assembly processes.

Q: What compliance certifications apply to both parts?

A: Both parts are RoHS3 compliant and REACH unaffected. Both carry EAR99 export classification and HTSUS code 8541.10.0050.

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