SMA5C33-TP Equivalent & Substitute Parts

Part Overview

The SMA5C33-TP is a Zener diode rated at 33 V nominal voltage with 3 W maximum power dissipation in a surface mount DO-214AC (SMA) package. This component is manufactured by Micro Commercial Co and is classified as obsolete. Due to its obsolete product status, equivalent substitute parts with active availability are necessary for ongoing design support, production continuity, and procurement reliability. The substitute part maintains the same core electrical specifications and package form factor while offering improved availability and active manufacturer support.

Substiute Parts

SMA5C33-TP

Micro Commercial CoIn Stock: 1033SMA5C33-TP Datasheet

Current PartRFQ

3SMAJ5937B-TP

Micro Commercial CoIn Stock: 227783SMAJ5937B-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMA5C33-TP is based on the following critical parameters that must remain constant or within acceptable engineering tolerances:

1. Zener Voltage (Vz): Both parts specify 33 V nominal voltage, ensuring identical voltage regulation characteristics.
2. Power Rating: Both parts are rated at 3 W maximum power dissipation, maintaining thermal and electrical performance equivalence.
3. Package Form Factor: Both parts use DO-214AC (SMA) surface mount packaging, ensuring mechanical and PCB layout compatibility.
4. Mounting Type: Both parts are surface mount components, compatible with identical assembly processes.
5. Regulatory Compliance: Both parts are ROHS3 compliant, meeting environmental and material restriction requirements.

The substitute part 3SMAJ5937B-TP is classified as active product status, providing ongoing manufacturer support and assured supply chain availability compared to the obsolete SMA5C33-TP.

Parameter Comparison

Engineering Selection Recommendations

The 3SMAJ5937B-TP is a direct functional equivalent to the SMA5C33-TP for applications requiring a 33 V, 3 W Zener diode in DO-214AC surface mount packaging. Selection of the substitute part is justified on the following engineering grounds:

1. Product Status: The SMA5C33-TP is obsolete, whereas 3SMAJ5937B-TP maintains active product status with ongoing manufacturer support and supply chain availability.
2. Electrical Equivalence: Both parts share identical nominal Zener voltage (33 V) and power rating (3 W), ensuring functional compatibility in voltage regulation and protection circuits.
3. Package Compatibility: Both parts use the DO-214AC (SMA) surface mount package, requiring no PCB layout modifications or assembly process changes.
4. Regulatory Compliance: Both parts are ROHS3 compliant and carry identical moisture sensitivity ratings, meeting environmental and manufacturing standards.
5. Improved Specifications: The substitute part offers tighter voltage tolerance (±5% versus ±6.06%) and lower impedance (33 Ohms versus 35 Ohms), providing enhanced performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 3SMAJ5937B-TP be used as a direct replacement for the SMA5C33-TP in existing designs?

A: Yes. Both parts are rated at 33 V nominal Zener voltage and 3 W maximum power dissipation in identical DO-214AC surface mount packages. No circuit modifications or PCB layout changes are required.

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

A: The primary differences are product status (obsolete versus active), voltage tolerance (±6.06% versus ±5%), impedance (35 Ohms versus 33 Ohms), and operating temperature minimum (-65°C versus -55°C). The substitute part offers tighter tolerance and lower impedance.

Q: Are there any temperature range limitations when substituting?

A: The SMA5C33-TP operates from -65°C to 150°C, while the 3SMAJ5937B-TP operates from -55°C to 150°C. For applications requiring operation below -55°C, the original part specification must be maintained. For standard industrial and commercial temperature ranges, the substitute part is fully compatible.

Q: Do both parts have the same packaging and moisture sensitivity?

A: Yes. Both parts use DO-214AC (SMA) surface mount packaging and carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture precautions are required during storage or handling.

Q: Is the substitute part RoHS compliant?

A: Yes. The 3SMAJ5937B-TP is ROHS3 compliant, matching the compliance status of the original SMA5C33-TP.

Q: What is the impact of the tighter tolerance on circuit performance?

A: The 3SMAJ5937B-TP offers ±5% voltage tolerance compared to ±6.06% for the SMA5C33-TP. This tighter tolerance provides improved voltage regulation accuracy and reduced variation across production batches, benefiting precision voltage reference and protection applications.