BZX79-C51,133 Equivalent & Substitute Parts

Part Overview

The BZX79-C51,133 is an active zener diode manufactured by Nexperia USA Inc., rated at 51 V nominal zener voltage with 400 mW maximum power dissipation. This through-hole component operates across a temperature range of -65°C to 200°C and is packaged in DO-204AH (DO-35) axial configuration. The device is ROHS3 compliant and REACH unaffected, making it suitable for industrial and commercial applications requiring voltage regulation and transient protection.

Substitute parts are identified when equivalent electrical performance can be maintained within the specified parameter tolerances while accommodating different packaging formats, tolerance grades, or manufacturer sourcing requirements.

Substiute Parts

BZX79-C51,133

Nexperia USA Inc.In Stock: 1144BZX79-C51,133 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

Substitution eligibility for the BZX79-C51,133 is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage (Vz) must equal 51 V nominal
• Mounting type must be Through Hole
• Package configuration must be DO-204AH (DO-35) axial
• Operating temperature range must encompass or exceed -65°C to 200°C
• RoHS3 compliance and REACH unaffected status required

Secondary Compatibility Factors:

• Power dissipation rating must be equal to or greater than 400 mW
• Tolerance grade may vary (±2% to ±5%) without affecting functional substitution
• Impedance and reverse leakage specifications may vary within acceptable design margins
• Packaging format (Tape & Box, Cut Tape) does not affect electrical compatibility

The BZX79-B51,133 qualifies as a parametric equivalent with improved tolerance (±2% versus ±5%) and identical electrical ratings. The BZX55C51-TAP qualifies as a similar substitute with higher power rating (500 mW) and automotive-grade qualification, though with a reduced upper operating temperature limit (175°C versus 200°C).

Parameter Comparison

Engineering Selection Recommendations

BZX79-B51,133 (Parametric Equivalent): This substitute is manufactured by the same supplier (Nexperia USA Inc.) and maintains identical electrical specifications with the exception of improved tolerance (±2% versus ±5%). Both devices are active products with ROHS3 compliance and REACH unaffected status. Selection of this part is appropriate when tighter voltage tolerance is required or when sourcing from the same manufacturer is preferred. Packaging format differs (Cut Tape versus Tape & Box) but does not affect electrical performance.

BZX55C51-TAP (Similar Substitute): This substitute is manufactured by Vishay General Semiconductor and provides higher power dissipation capability (500 mW versus 400 mW) with lower impedance (125 Ohms versus 180 Ohms). The device carries automotive-grade qualification (AEC-Q101) and is an active product with ROHS3 compliance and REACH unaffected status. Selection of this part is appropriate for applications requiring enhanced power handling or automotive-qualified components. The upper operating temperature limit is reduced to 175°C, which must be evaluated against application requirements. Reverse leakage current is higher (100 nA @ 39 V versus 50 nA @ 35.7 V).

All three parts maintain identical 51 V nominal zener voltage, through-hole mounting configuration, and DO-204AH (DO-35) axial package format, ensuring direct mechanical and electrical compatibility within the specified parameter ranges.

Frequently Asked Questions (FAQ)

Q: Can BZX79-B51,133 be used as a direct replacement for BZX79-C51,133?

A: Yes. Both devices are manufactured by Nexperia USA Inc., share identical zener voltage (51 V), power rating (400 mW), impedance (180 Ohms), and operating temperature range (-65°C to 200°C). The BZX79-B51,133 provides improved tolerance (±2% versus ±5%). Packaging format differs (Cut Tape versus Tape & Box) but does not affect electrical substitution.

Q: What are the limitations of using BZX55C51-TAP as a substitute?

A: The BZX55C51-TAP operates with a maximum temperature of 175°C, which is 25°C lower than the BZX79-C51,133 specification of 200°C. Applications requiring operation above 175°C must not use this substitute. Additionally, reverse leakage current is higher (100 nA @ 39 V versus 50 nA @ 35.7 V), which may affect circuit performance in high-impedance applications.

Q: Are all three parts physically compatible in the same circuit board layout?

A: Yes. All three parts use DO-204AH (DO-35) axial package configuration with through-hole mounting. Physical footprint and lead spacing are identical, allowing direct board-level substitution without layout modification.

Q: Does packaging format (Tape & Box versus Cut Tape) affect electrical performance?

A: No. Packaging format affects only handling, storage, and assembly processes. Electrical specifications and performance are independent of whether the component is supplied in Tape & Box or Cut Tape format.

Q: Which substitute should be selected for automotive applications?

A: The BZX55C51-TAP carries AEC-Q101 automotive qualification. If automotive-grade certification is required, this substitute is the appropriate selection. The BZX79-C51,133 and BZX79-B51,133 do not carry automotive qualification.

Q: Can BZX55C51-TAP handle higher power dissipation than the main part?

A: Yes. The BZX55C51-TAP is rated for 500 mW maximum power dissipation compared to 400 mW for the BZX79-C51,133. This provides additional thermal margin in applications approaching the power limit of the original specification.