MMXZ5231BS-TP Equivalent & Substitute Parts

Part Overview

The MMXZ5231BS-TP is a Zener diode rated at 5.1 V nominal with 500 mW power dissipation in a surface mount SOD-323 package, manufactured by Micro Commercial Co. This component is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity. The part operates across a temperature range of -55°C to 150°C and maintains ROHS3 compliance with unlimited moisture sensitivity rating.

Substiute Parts

MMXZ5231BS-TP

Micro Commercial CoIn Stock: 941MMXZ5231BS-TP Datasheet

Current PartRFQ

UDZ5V1BF-7

Diodes IncorporatedIn Stock: 343639UDZ5V1BF-7 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMXZ5231BS-TP is determined by the following critical electrical and mechanical parameters:

Primary Matching Criteria:

• Zener voltage nominal rating: 5.1 V
• Maximum power dissipation: 500 mW
• Package type: SOD-323 or compatible variant (SOD-323F)
• Surface mount configuration
• Operating temperature range compatibility

Secondary Compatibility Factors:

• Voltage tolerance (±5.88% for main part; tighter tolerances acceptable)
• Impedance characteristics (17 Ohms maximum for main part)
• Reverse leakage current specifications
• Forward voltage characteristics
• RoHS3 compliance and regulatory alignment

The UDZ5V1BF-7 manufactured by Diodes Incorporated qualifies as a substitute based on matching nominal Zener voltage (5.1 V), identical power rating (500 mW), compatible package family (SOD-323F), and surface mount configuration. The substitute exhibits improved tolerance (±2% versus ±5.88%), operates across an extended temperature range (-65°C to 150°C), and maintains ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The UDZ5V1BF-7 is suitable as a substitute for the obsolete MMXZ5231BS-TP based on the following engineering factors:

Electrical Compatibility: Both components maintain identical nominal Zener voltage (5.1 V) and maximum power dissipation (500 mW), satisfying core circuit requirements. The substitute exhibits superior voltage tolerance (±2% versus ±5.88%), resulting in tighter voltage regulation characteristics. The impedance specification of the substitute (80 Ohms maximum) differs from the original (17 Ohms maximum); this parameter must be evaluated within the specific circuit application to confirm acceptable performance.

Thermal and Environmental Compliance: The substitute operates across an extended temperature range (-65°C to 150°C) compared to the original (-55°C to 150°C), providing broader environmental coverage. Both components maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring regulatory alignment and manufacturing process compatibility.

Product Status and Availability: The original MMXZ5231BS-TP is classified as obsolete with limited inventory (834 units). The substitute UDZ5V1BF-7 is active with substantial inventory availability (343,610 units), supporting long-term design continuity and supply chain stability.

Package Considerations: The substitute utilizes SOD-323F packaging, a variant of the original SOD-323 package. Both packages are surface mount configurations with compatible footprints suitable for standard PCB assembly processes. Packaging format differences (bulk versus tape & reel) do not affect electrical performance or mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the UDZ5V1BF-7 directly replace the MMXZ5231BS-TP in existing designs?

A: Yes, the UDZ5V1BF-7 qualifies as a direct substitute based on matching nominal Zener voltage (5.1 V), identical power rating (500 mW), and compatible surface mount package configuration. The SOD-323F package is mechanically and electrically compatible with SOD-323 footprints. However, the impedance specification difference (80 Ohms versus 17 Ohms) requires circuit-level evaluation to confirm acceptable performance in the specific application.

Q: What are the key differences between these two parts?

A: The primary differences are: (1) Product status—the original is obsolete while the substitute is active; (2) Voltage tolerance—the substitute offers ±2% versus ±5.88%; (3) Operating temperature range—the substitute extends to -65°C versus -55°C; (4) Impedance—the substitute specifies 80 Ohms maximum versus 17 Ohms; (5) Reverse leakage current—the substitute exhibits lower leakage (2 µA @ 1.5 V versus 5 µA @ 2 V); (6) Forward voltage—the substitute shows lower forward voltage (0.95 V @ 10 mA versus 1.2 V @ 100 mA).

Q: Are there any package compatibility concerns?

A: Both components utilize surface mount packages within the SOD-323 family. The original uses SOD-323 packaging while the substitute uses SOD-323F. These packages share compatible footprints and are suitable for standard PCB assembly processes. The packaging format difference (bulk versus tape & reel) affects procurement and handling but not electrical or mechanical performance.

Q: Does the impedance difference affect circuit performance?

A: The substitute specifies higher impedance (80 Ohms maximum) compared to the original (17 Ohms maximum). Impedance affects transient response and noise filtering characteristics in Zener diode applications. Circuit-level analysis is required to determine whether the impedance specification of the substitute is acceptable for the specific application requirements.

Q: Are both parts RoHS compliant?

A: Yes, both the MMXZ5231BS-TP and UDZ5V1BF-7 are ROHS3 compliant, ensuring compatibility with regulatory requirements and manufacturing standards for lead-free assembly processes.

Q: What is the significance of the improved voltage tolerance in the substitute?

A: The substitute offers ±2% tolerance compared to ±5.88% for the original. Tighter tolerance results in more precise voltage regulation, reducing variation in Zener voltage across the specified operating range. This characteristic is beneficial in applications requiring stable reference voltages or precise voltage clamping.