BZX284-C47,115 Equivalent & Substitute Parts

Part Overview

The BZX284-C47,115 is a Zener diode rated at 47 V with 400 mW power dissipation in SOD-110 surface mount packaging, manufactured by NXP USA Inc. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. The obsolete status requires substitution planning to ensure supply chain continuity and design compatibility.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	47 V
Tolerance	±5%
Power - Max	400 mW
Impedance (Max) (Zzt)	90 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 32.9 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 100 mA
Operating Temperature Range	-65°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOD-110
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BZX284-C47,115 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage rating: 47 V nominal
Operating temperature range: -65°C ~ 150°C
Reverse leakage current: 50 nA @ 32.9 V
Forward voltage: 1.1 V @ 100 mA

Mechanical & Compliance Criteria:

Surface mount technology
RoHS3 compliance
MSL rating of 1 (Unlimited)

The BZX384-B47,115 meets all electrical specifications and compliance requirements. While the package format differs (SOD-323 versus SOD-110) and power rating is reduced (300 mW versus 400 mW), the substitute maintains the critical zener voltage, temperature range, and leakage characteristics necessary for functional equivalence in applications where the lower power dissipation is acceptable.

Parameter Comparison

Parameter	BZX284-C47,115	BZX384-B47,115
Manufacturer	NXP USA Inc.	Nexperia USA Inc.
Voltage - Zener (Nom) (Vz)	47 V	47 V
Tolerance	±5%	±2%
Power - Max	400 mW	300 mW
Impedance (Max) (Zzt)	90 Ohms	170 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 32.9 V	50 nA @ 32.9 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 100 mA	1.1 V @ 100 mA
Operating Temperature Range	-65°C ~ 150°C	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	SOD-110	SOD-323
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The BZX384-B47,115 is the designated manufacturer-recommended substitute for the obsolete BZX284-C47,115. Selection of this substitute is supported by the following factors:

Product Status: The BZX384-B47,115 maintains active production status, ensuring long-term availability and supply chain stability compared to the obsolete BZX284-C47,115.

Electrical Compatibility: Both devices maintain identical zener voltage (47 V), operating temperature range (-65°C ~ 150°C), and reverse leakage characteristics (50 nA @ 32.9 V). The BZX384-B47,115 provides improved tolerance (±2% versus ±5%), enhancing voltage regulation precision.

Compliance Certification: Both components are ROHS3 compliant with MSL rating of 1 (Unlimited), meeting environmental and moisture sensitivity requirements.

Package Consideration: The SOD-323 package of the BZX384-B47,115 is smaller than the SOD-110 package of the original part. PCB layout modification is required for substitution.

Power Dissipation: The BZX384-B47,115 is rated at 300 mW maximum power dissipation compared to 400 mW for the BZX284-C47,115. Circuit design must confirm that application power requirements do not exceed 300 mW.

Frequently Asked Questions (FAQ)

Q: Can the BZX384-B47,115 directly replace the BZX284-C47,115 without circuit modification?

A: Electrical substitution is valid based on matching zener voltage, operating temperature range, and leakage characteristics. However, PCB layout modification is required due to package format change from SOD-110 to SOD-323. Additionally, circuit design must confirm that power dissipation requirements do not exceed the 300 mW rating of the substitute.

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

A: The BZX384-B47,115 provides tighter voltage tolerance (±2%) compared to the BZX284-C47,115 (±5%). This results in improved zener voltage regulation accuracy. Applications requiring precise voltage reference will benefit from this enhanced specification.

Q: Are there any compliance or certification differences between these parts?

A: Both components are ROHS3 compliant with identical MSL ratings of 1 (Unlimited). No compliance or certification differences exist between the two parts.

Q: What is the impact of the impedance difference (90 Ohms versus 170 Ohms)?

A: The BZX284-C47,115 has lower impedance (90 Ohms) compared to the BZX384-B47,115 (170 Ohms). Lower impedance provides better voltage regulation under load changes. Circuit design must evaluate whether the higher impedance of the substitute affects voltage stability in the application.

Q: Is the 300 mW power rating of the substitute sufficient for all applications using the original 400 mW part?

A: The substitute's 300 mW rating is lower than the original 400 mW rating. Applications must be evaluated to confirm that actual power dissipation does not exceed 300 mW. If the original design requires power dissipation above 300 mW, the BZX384-B47,115 is not suitable.

Q: What packaging considerations apply when substituting these parts?

A: The BZX284-C47,115 uses SOD-110 packaging while the BZX384-B47,115 uses SOD-323 packaging. SOD-323 is a smaller package format. PCB footprint redesign is required, and component placement and routing must be adjusted accordingly.

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