BZX284-B33,115 Equivalent & Substitute Parts

Part Overview

The BZX284-B33,115 is a Zener diode rated at 33 V nominal voltage with 400 mW maximum power dissipation in SOD-110 surface mount packaging. Manufactured by NXP USA Inc., this component is classified as obsolete product status. Due to its obsolete designation, locating replacement units from original inventory becomes increasingly difficult. Identifying functionally equivalent substitute parts ensures design continuity and supply chain reliability for applications requiring 33 V Zener regulation.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	33	V
Tolerance	±2%	-
Power - Max	400	mW
Impedance (Max)	40	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 23.1 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	-
Product Status	Obsolete	-

Substitute Part Grouping Explanation

Substitution of the BZX284-B33,115 is determined by the following critical electrical and mechanical parameters:

Electrical Matching Criteria:

Zener voltage: 33 V nominal with ±2% tolerance
Reverse leakage current: 50 nA @ 23.1 V
Forward voltage: 1.1 V maximum @ 100 mA
Operating temperature range: -65°C to 150°C

Mechanical Compatibility:

Surface mount technology requirement
Package form factor compatibility

The BZX384-B33,115 qualifies as a substitute based on matching all electrical specifications. However, the package transition from SOD-110 to SOD-323 represents a mechanical change that requires PCB layout evaluation.

Parameter Comparison

Parameter	BZX284-B33,115	BZX384-B33,115	Match Status
Voltage - Zener (Nom)	33 V	33 V	Matched
Tolerance	±2%	±2%	Matched
Power - Max	400 mW	300 mW	Substitute Lower
Impedance (Max)	40 Ohms	80 Ohms	Substitute Higher
Current - Reverse Leakage @ Vr	50 nA @ 23.1 V	50 nA @ 23.1 V	Matched
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 100 mA	1.1 V @ 100 mA	Matched
Operating Temperature Range	-65 to 150°C	-65 to 150°C	Matched
Mounting Type	Surface Mount	Surface Mount	Matched
Package / Case	SOD-110	SOD-323	Different
Product Status	Obsolete	Active	Substitute Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Matched
REACH Status	REACH Unaffected	REACH Unaffected	Matched

Engineering Selection Recommendations

The BZX384-B33,115 serves as the primary substitute for the obsolete BZX284-B33,115 based on the following factors:

Electrical Equivalence: All critical electrical parameters match the original specification, including nominal Zener voltage, tolerance, reverse leakage current, and forward voltage characteristics. The operating temperature range remains identical.

Compliance Status: Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity in applications subject to environmental standards.

Product Availability: The BZX384-B33,115 maintains active product status with substantial inventory availability (54,234 pieces), contrasting with the obsolete BZX284-B33,115 designation.

Design Considerations: The transition from SOD-110 to SOD-323 packaging requires PCB layout modification. The SOD-323 package is smaller, necessitating footprint redesign. The maximum power rating decreases from 400 mW to 300 mW, and impedance increases from 40 Ohms to 80 Ohms. Applications operating at the thermal limits of the original 400 mW specification require thermal analysis to confirm the 300 mW rating remains adequate.

Frequently Asked Questions (FAQ)

Q: Can the BZX384-B33,115 directly replace the BZX284-B33,115 without PCB modification?

A: No. While electrical specifications are equivalent, the package change from SOD-110 to SOD-323 requires PCB footprint redesign. Direct board-level substitution is not possible without layout changes.

Q: What is the significance of the power rating difference (400 mW vs. 300 mW)?

A: The substitute part has a lower maximum power dissipation rating. Applications must operate within the 300 mW limit. Thermal analysis is required if the original design approached 400 mW dissipation levels.

Q: Does the impedance increase from 40 Ohms to 80 Ohms affect circuit performance?

A: Higher impedance affects transient response characteristics. Circuit simulation or testing is necessary to confirm performance in applications sensitive to impedance specifications.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both BZX284-B33,115 and BZX384-B33,115 are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance for restricted substance directives.

Q: Why is the BZX284-B33,115 marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The BZX384-B33,115 represents the active product line continuation with equivalent electrical performance.

Q: What packaging format is the BZX384-B33,115 supplied in?

A: The BZX384-B33,115 is supplied in Tape & Reel (TR) format, standard for high-volume surface mount component distribution.

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