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CD5231B Zener Diode Equivalent & Substitute Parts
Part Overview
The CD5231B is an active Microchip Technology zener diode designed for voltage regulation applications. This surface mount die component operates across an extended temperature range and delivers 500 mW maximum power dissipation at a nominal zener voltage of 5.1 V. The part is RoHS3 compliant and REACH unaffected, making it suitable for regulated industrial and commercial applications. Substitute parts are identified when equivalent electrical characteristics and mechanical specifications align with the original component, enabling direct replacement in circuit designs without performance degradation.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Zener (Nom) | 5.1 | V |
| Tolerance | ±5% | — |
| Power - Max | 500 | mW |
| Impedance (Max) | 17 | Ohms |
| Current - Reverse Leakage @ Vr | 5 | µA @ 2 V |
| Voltage - Forward (Vf) (Max) @ If | 1.5 | V @ 200 mA |
| Operating Temperature Range | -65 to 175 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | Die | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts for the CD5231B are identified based on strict electrical and mechanical parameter matching. The substitution criteria include:
- Nominal zener voltage of 5.1 V with ±5% tolerance
- Maximum power dissipation of 500 mW
- Maximum impedance of 17 Ohms
- Reverse leakage current of 5 µA at 2 V
- Forward voltage of 1.5 V maximum at 200 mA
- Operating temperature range of -65°C to 175°C
- Surface mount die package configuration
- RoHS3 compliance and REACH unaffected status
Parts meeting all these parameters are classified as parametric equivalents and direct substitutes. No deviations from specified electrical or mechanical characteristics are permitted for substitute classification.
Parameter Comparison
| Parameter | CD5231B | CD751A | Match |
|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Yes |
| Category | Diodes, Zener | Diodes, Zener | Yes |
| Voltage - Zener (Nom) | 5.1 V | 5.1 V | Yes |
| Tolerance | ±5% | ±5% | Yes |
| Power - Max | 500 mW | 500 mW | Yes |
| Impedance (Max) | 17 Ohms | 17 Ohms | Yes |
| Current - Reverse Leakage @ Vr | 5 µA @ 2 V | 5 µA @ 2 V | Yes |
| Voltage - Forward (Vf) (Max) @ If | 1.5 V @ 200 mA | 1.5 V @ 200 mA | Yes |
| Operating Temperature Range | -65°C to 175°C | -65°C to 175°C | Yes |
| Mounting Type | Surface Mount | Surface Mount | Yes |
| Package / Case | Die | Die | Yes |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Yes |
| REACH Status | REACH Unaffected | REACH Unaffected | Yes |
| Product Status | Active | Active | Yes |
Engineering Selection Recommendations
The CD751A is a direct parametric equivalent to the CD5231B. Both components are manufactured by Microchip Technology and share identical electrical specifications, mechanical packaging, and regulatory compliance certifications. Both parts maintain active product status, ensuring continued availability and support.
Selection between CD5231B and CD751A is based on inventory availability and supply chain considerations. The CD751A currently maintains higher inventory levels (1610 pieces) compared to the CD5231B (930 pieces), which may influence procurement decisions for high-volume applications. Both parts satisfy RoHS3 compliance requirements and REACH unaffected status, making them suitable for regulated markets.
No performance differences exist between these components when applied to equivalent circuit designs. The choice between them does not affect circuit functionality, thermal performance, or regulatory compliance.
Frequently Asked Questions (FAQ)
Q: Can CD751A replace CD5231B in existing circuit designs?
A: Yes. The CD751A is a direct parametric equivalent with identical electrical characteristics, operating temperature range, and surface mount die package configuration. No circuit modifications are required.
Q: Are there any differences in RoHS or REACH compliance between these parts?
A: No. Both CD5231B and CD751A are RoHS3 compliant and REACH unaffected. They meet identical regulatory requirements for restricted substances and environmental compliance.
Q: What determines whether a zener diode can substitute for another?
A: Substitution requires matching nominal zener voltage, voltage tolerance, maximum power dissipation, impedance, reverse leakage current, forward voltage characteristics, operating temperature range, and package type. All these parameters must align exactly between the original and substitute part.
Q: Does the surface mount die package differ between CD5231B and CD751A?
A: No. Both components use identical surface mount die packaging and mounting specifications. They are mechanically interchangeable in circuit board layouts.
Q: Why would I choose CD751A over CD5231B if they are equivalent?
A: Selection is based on supply chain factors such as inventory availability, lead time, and procurement cost. The CD751A currently has higher stock levels, which may reduce procurement time for urgent orders.
Q: Are there any temperature performance differences between these parts?
A: No. Both components operate across the identical temperature range of -65°C to 175°C with no performance variations across this range.
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