BZX79-B51,143 Equivalent & Substitute Parts

Part Overview

The BZX79-B51,143 is a through-hole Zener diode manufactured by Nexperia USA Inc., rated at 51 V nominal with 400 mW maximum power dissipation and ±2% tolerance. This component is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, packaging format preferences, or design flexibility within specified parameter ranges.

Substiute Parts

BZX79-B51,143

Nexperia USA Inc.In Stock: 777BZX79-B51,143 Datasheet

Current PartRFQ

BZX79-B51,133

Nexperia USA Inc.In Stock: 9486BZX79-B51,133 Datasheet

Parametric EquivalentRFQ

BZX55C51-TAP

Vishay General Semiconductor - Diodes DivisionIn Stock: 40368BZX55C51-TAP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BZX79-B51,143 are grouped based on the following critical parameters that determine functional equivalence:

Primary Equivalence Criteria:

• Voltage - Zener (Nom): 51 V
• Mounting Type: Through Hole
• Package / Case: DO-204AH, DO-35, Axial

Secondary Compatibility Parameters:

• Power - Max: 400 mW or greater
• Operating Temperature Range: Minimum -65°C to 200°C or compatible subset
• RoHS Status: ROHS3 Compliant

Packaging Format Flexibility: Substitutes may differ in supplier packaging (Tape & Box versus Cut Tape) without affecting electrical performance or mechanical fit. The BZX79-B51,133 represents a parametric equivalent with identical electrical specifications but different packaging format. The BZX55C51-TAP represents a similar part with higher power rating and automotive qualification, suitable for applications where increased power dissipation capacity is acceptable.

Parameter Comparison

Engineering Selection Recommendations

BZX79-B51,133 Selection Criteria: The BZX79-B51,133 is a direct parametric equivalent to the BZX79-B51,143, differing only in packaging format (Cut Tape versus Tape & Box). Both parts are manufactured by Nexperia USA Inc., maintain identical electrical specifications, and carry Active product status with ROHS3 compliance. Selection of this substitute is appropriate when Cut Tape packaging format is preferred for automated assembly processes or when inventory availability of the Tape & Box format is constrained.

BZX55C51-TAP Selection Criteria: The BZX55C51-TAP is a similar Zener diode manufactured by Vishay General Semiconductor - Diodes Division with the following distinctions: 500 mW maximum power rating (versus 400 mW), ±5% tolerance (versus ±2%), 125 Ohms maximum impedance (versus 180 Ohms), and AEC-Q101 automotive qualification. This part is suitable for applications where increased power dissipation capacity is required and tolerance relaxation from ±2% to ±5% is acceptable. The operating temperature range extends to 175°C (versus 200°C for the primary part). All three parts maintain ROHS3 compliance and identical through-hole axial package configuration.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B51,133 be used as a direct replacement for BZX79-B51,143?

A: Yes. The BZX79-B51,133 is a parametric equivalent with identical electrical specifications (51 V nominal, 400 mW power, ±2% tolerance, 180 Ohms impedance, -65°C to 200°C operating range). The only difference is packaging format: BZX79-B51,143 is supplied in Tape & Box format while BZX79-B51,133 is supplied in Cut Tape format. Both are through-hole axial components with identical mechanical fit.

Q: Under what conditions is BZX55C51-TAP an acceptable substitute?

A: The BZX55C51-TAP is acceptable when: (1) the application requires greater than 400 mW power dissipation capacity (this part is rated 500 mW), (2) tolerance relaxation from ±2% to ±5% is acceptable for the circuit design, and (3) the maximum operating temperature requirement does not exceed 175°C. All three parts share identical 51 V nominal voltage and through-hole axial package configuration.

Q: What are the impedance differences between these parts?

A: The BZX79-B51,143 and BZX79-B51,133 both specify 180 Ohms maximum impedance. The BZX55C51-TAP specifies 125 Ohms maximum impedance, indicating lower dynamic impedance. This difference may affect circuit performance in applications sensitive to impedance characteristics.

Q: Are all three parts RoHS compliant?

A: Yes. All three parts (BZX79-B51,143, BZX79-B51,133, and BZX55C51-TAP) are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Q: Does the BZX55C51-TAP automotive qualification affect its use in non-automotive applications?

A: No. AEC-Q101 qualification indicates the part meets automotive industry standards and is suitable for automotive applications. This qualification does not restrict use in non-automotive applications; it indicates additional quality and reliability testing has been performed.

Q: What is the difference between Tape & Box and Cut Tape packaging?

A: Tape & Box (TB) packaging supplies components on continuous tape wound in a box, typically for manual handling or lower-volume assembly. Cut Tape (CT) packaging supplies components on tape cut to specific lengths, optimized for automated pick-and-place assembly equipment. Electrical and mechanical specifications are identical; packaging format selection depends on assembly process requirements.