BZX84J-C51,115 Equivalent & Substitute Parts

Part Overview

The BZX84J-C51,115 is an automotive-grade Zener diode manufactured by Nexperia USA Inc., rated for 51 V nominal Zener voltage with 550 mW maximum power dissipation. The device is packaged in SOD-323F surface mount configuration and qualifies to AEC-Q101 automotive standards. This part is currently active in production with 3686 units in stock. Equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity for applications requiring 51 V Zener regulation in surface mount implementations.

Substiute Parts

BZX84J-C51,115

Nexperia USA Inc.In Stock: 3697BZX84J-C51,115 Datasheet

Current PartRFQ

BZX84J-B51,115

Nexperia USA Inc.In Stock: 6766BZX84J-B51,115 Datasheet

Parametric EquivalentRFQ

MM3Z51VB

onsemiIn Stock: 3236MM3Z51VB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of Zener diodes is determined by matching the following critical electrical and mechanical parameters:

Primary Matching Criteria:

• Zener voltage (nominal): 51 V
• Package type: SOD-323F surface mount
• Operating temperature range: -65°C to 150°C
• RoHS compliance status

Secondary Matching Criteria:

• Power dissipation rating (550 mW or higher)
• Tolerance specification (±5% or tighter)
• Impedance characteristics
• Reverse leakage current specifications

Substitute parts are classified into two categories:

Parametric Equivalent: Parts with identical or superior electrical specifications across all measured parameters, including power rating, tolerance, and impedance.

Similar Equivalent: Parts with matching Zener voltage and package but with reduced power rating or modified electrical characteristics. These parts function in the same circuit topology but with different thermal and current handling capabilities.

Parameter Comparison

Engineering Selection Recommendations

BZX84J-B51,115 (Parametric Equivalent):

The BZX84J-B51,115 is a direct parametric equivalent manufactured by Nexperia USA Inc. This part maintains identical power dissipation (550 mW), impedance (110 Ohms), and forward voltage characteristics while offering improved tolerance specification (±2% versus ±5%). Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance. The BZX84J-B51,115 is suitable for applications requiring the full 550 mW power rating with enhanced voltage accuracy. Inventory availability is higher at 6708 units.

MM3Z51VB (Similar Equivalent):

The MM3Z51VB is a similar equivalent manufactured by onsemi, matching the 51 V Zener voltage and SOD-323F package. This part is suitable for applications where power dissipation requirements do not exceed 200 mW. The MM3Z51VB exhibits lower impedance (169 Ohms versus 110 Ohms) and reduced reverse leakage current (45 nA versus 50 nA). Forward voltage characteristics differ due to lower current rating (1 V @ 10 mA versus 1.1 V @ 100 mA). This part is appropriate for lower-power regulation circuits and offers ROHS3 compliance with 3200 units in stock.

Selection between these parts depends on circuit power requirements and thermal design constraints. Both substitute parts maintain automotive-grade qualification and regulatory compliance with the main part.

Frequently Asked Questions (FAQ)

Q: Can BZX84J-B51,115 be used as a direct replacement for BZX84J-C51,115?

A: Yes. The BZX84J-B51,115 is a parametric equivalent with identical electrical performance across power rating, impedance, and forward voltage specifications. The primary difference is improved tolerance (±2% versus ±5%), making it suitable for applications requiring higher voltage accuracy. Both parts are manufactured by Nexperia USA Inc., carry AEC-Q101 qualification, and use the same SOD-323F package.

Q: What are the limitations of using MM3Z51VB as a substitute?

A: The MM3Z51VB has a maximum power rating of 200 mW compared to 550 mW for the main part. This limits its use to lower-power applications. The impedance is higher (169 Ohms versus 110 Ohms), which affects voltage regulation characteristics under load. Forward voltage specifications are measured at different current levels (1 V @ 10 mA versus 1.1 V @ 100 mA), reflecting the lower current capability. Applications requiring full 550 mW dissipation must use BZX84J-C51,115 or BZX84J-B51,115.

Q: Are all three parts compatible with automotive applications?

A: BZX84J-C51,115 and BZX84J-B51,115 both carry AEC-Q101 automotive qualification and automotive grade designation. MM3Z51VB does not list automotive grade or AEC-Q101 qualification in the provided specifications. For automotive applications requiring formal qualification compliance, use BZX84J-C51,115 or BZX84J-B51,115.

Q: Do all substitute parts have the same package footprint?

A: Yes. All three parts use the SOD-323F package with surface mount configuration. PCB layout and reflow soldering parameters remain identical across all parts.

Q: What is the difference between tolerance specifications?

A: BZX84J-C51,115 has ±5% tolerance, meaning the actual Zener voltage can vary between 48.45 V and 53.55 V. BZX84J-B51,115 and MM3Z51VB have ±2% tolerance, resulting in a tighter range of 49.98 V to 52.02 V. Tighter tolerance improves voltage regulation accuracy in precision applications.

Q: Are all parts RoHS compliant?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for commercial and industrial applications.

Q: What is the impedance parameter and why does it differ?

A: Impedance (Zzt) represents the dynamic impedance of the Zener diode at the specified test current. Lower impedance indicates better voltage regulation under varying load conditions. BZX84J-C51,115 and BZX84J-B51,115 have 110 Ohms impedance, while MM3Z51VB has 169 Ohms. For applications requiring stable voltage regulation across load variations, the lower impedance parts are preferred.