BZX284-C20,115 Equivalent & Substitute Parts

Part Overview

The BZX284-C20,115 is a Zener diode rated at 20 V nominal voltage with 400 mW maximum power dissipation, manufactured by NXP USA Inc. in SOD-110 surface mount package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -65°C to 150°C and maintains ±5% voltage tolerance with ROHS3 compliance.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	20	V
Tolerance	±5%	%
Power - Max	400	mW
Impedance (Max)	20	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 14 V
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 100 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-110	—

Substitute Part Grouping Explanation

Substitution of the BZX284-C20,115 is determined by the following critical electrical parameters:

Electrical Compatibility Criteria:

Zener voltage (Vz) must equal 20 V nominal
Operating temperature range must encompass -65°C to 150°C
Reverse leakage current specification must not exceed 50 nA @ 14 V
Forward voltage (Vf) must not exceed 1.1 V @ 100 mA

Mechanical Compatibility Criteria:

Surface mount technology requirement
Package form factor compatibility with PCB layout constraints

The BZX384-B20,115 qualifies as a direct electrical substitute based on matching nominal Zener voltage, identical operating temperature range, equivalent reverse leakage specification, and matching forward voltage characteristics. The substitute maintains surface mount technology compatibility, though package geometry differs (SOD-323 versus SOD-110).

Parameter Comparison

Parameter	BZX284-C20,115	BZX384-B20,115	Match Status
Voltage - Zener (Nom)	20 V	20 V	Identical
Tolerance	±5%	±2%	Substitute tighter
Power - Max	400 mW	300 mW	Substitute lower
Impedance (Max)	20 Ohms	55 Ohms	Substitute higher
Current - Reverse Leakage @ Vr	50 nA @ 14 V	50 nA @ 14 V	Identical
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 100 mA	1.1 V @ 100 mA	Identical
Operating Temperature Range	-65 to 150°C	-65 to 150°C	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	SOD-110	SOD-323	Different
Product Status	Obsolete	Active	Substitute active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical

Engineering Selection Recommendations

The BZX384-B20,115 serves as the primary substitute for the obsolete BZX284-C20,115. Selection of this substitute is supported by the following engineering factors:

Electrical Equivalence: Both devices maintain identical nominal Zener voltage (20 V), reverse leakage current (50 nA @ 14 V), and forward voltage characteristics (1.1 V @ 100 mA). The substitute exhibits tighter voltage tolerance (±2% versus ±5%), which represents an improvement in voltage regulation precision.

Regulatory Compliance: Both components maintain ROHS3 compliance and carry identical REACH and ECCN classifications (EAR99), ensuring regulatory continuity in procurement and deployment.

Product Status Advantage: The substitute transitions from obsolete to active product status, ensuring long-term availability and manufacturing support from Nexperia USA Inc.

Power Dissipation Consideration: The substitute operates at reduced maximum power (300 mW versus 400 mW). Circuit designs must verify that thermal requirements do not exceed 300 mW dissipation capacity. Applications requiring sustained power dissipation above 300 mW require alternative component selection.

Package Geometry Impact: The transition from SOD-110 to SOD-323 package requires PCB layout modification. SOD-323 represents a smaller form factor, necessitating footprint redesign and potential board space optimization.

Frequently Asked Questions (FAQ)

Q: Can BZX384-B20,115 directly replace BZX284-C20,115 without circuit modification?

A: Electrical substitution is valid based on matching Zener voltage, operating temperature range, and leakage specifications. PCB layout modification is required due to package geometry change from SOD-110 to SOD-323. Thermal design review is necessary to confirm 300 mW maximum power dissipation is sufficient for the application.

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

A: The substitute exhibits tighter voltage tolerance, meaning Zener voltage variation across the production batch is reduced. This improves voltage regulation consistency. Applications requiring ±5% tolerance acceptance will operate within specification with the substitute.

Q: Why does the substitute have higher impedance (55 Ohms versus 20 Ohms)?

A: Impedance specification reflects dynamic resistance characteristics. Higher impedance in the substitute may result in slightly increased voltage variation under load current changes. Circuit designs must verify that impedance-related voltage ripple remains within acceptable limits for the application.

Q: Is the 300 mW power rating sufficient for my application?

A: Power dissipation capacity must be calculated based on actual circuit operating conditions. If sustained dissipation exceeds 300 mW, the substitute is not suitable. Thermal analysis of the original design using 400 mW capacity is required to determine compatibility.

Q: Are there any moisture sensitivity or packaging concerns?

A: Both components carry MSL Level 1 (Unlimited), indicating no moisture sensitivity restrictions. Tape & Reel packaging for the substitute is standard for high-volume surface mount assembly and does not present handling concerns beyond standard ESD precautions.

Q: What is the impact of moving from NXP to Nexperia as manufacturer?

A: Nexperia USA Inc. is the current manufacturer of the BZX384 series. Both manufacturers maintain equivalent quality and compliance certifications. The transition reflects industry consolidation and does not impact electrical or regulatory performance.

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