MCT1117B-3.3-TP Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MCT1117B-3.3-TP is a linear voltage regulator IC manufactured by Micro Commercial Co, designed to provide a fixed positive 3.3V output at 1A current capacity in a surface mount SOT-223 package. This device is classified as obsolete, which necessitates identification of active equivalent parts for continued system design and procurement.

The MCT1117B-3.3-TP operates across an input voltage range up to 15V with a maximum dropout voltage of 1.3V at full load current. The regulator is suitable for applications requiring stable low-voltage power distribution in compact form factors.

Due to its obsolete product status, sourcing alternatives from active product lines is essential for new designs and long-term supply chain continuity.

Substiute Parts

MCT1117B-3.3-TP

Micro Commercial CoIn Stock: 25307MCT1117B-3.3-TP Datasheet

Current PartRFQ

MCT1117C-3.3-TP

Micro Commercial CoIn Stock: 705MCT1117C-3.3-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MCT1117B-3.3-TP is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Fixed output voltage of 3.3V
• Output current rating of 1A minimum
• Positive output configuration
• Single regulator topology
• Surface mount package (SOT-223)

Mechanical Compatibility Criteria:

• Package designation: TO-261-4 or TO-261AA
• Pin-compatible footprint for direct PCB replacement

The MCT1117C-3.3-TP from Micro Commercial Co meets all substitution criteria. While the MCT1117C variant exhibits different input voltage maximum (30V vs. 15V) and dropout voltage characteristics (1.4V vs. 1.3V), these represent improvements in the substitute part and do not prevent functional equivalence in applications designed for the MCT1117B-3.3-TP.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: MCT1117C-3.3-TP

The MCT1117C-3.3-TP is the recommended substitute for the obsolete MCT1117B-3.3-TP. Selection rationale is based on the following factors:

Product Status: The MCT1117C-3.3-TP carries an Active product status, ensuring long-term availability and supply chain continuity compared to the Obsolete MCT1117B-3.3-TP.

Regulatory Compliance: Both parts maintain identical REACH and ECCN classifications (REACH Unaffected, EAR99), confirming equivalent compliance posture for export and environmental regulations.

Electrical Equivalence: The substitute part maintains the critical 3.3V fixed output voltage and 1A output current specification. The increased maximum input voltage rating (30V vs. 15V) and inclusion of over-temperature protection represent functional enhancements that do not compromise backward compatibility in applications designed for the original part.

Package Compatibility: Identical SOT-223 package designation and TO-261-4/TO-261AA case specifications ensure direct PCB footprint compatibility without layout modifications.

Design Margin: The MCT1117C-3.3-TP provides improved input voltage headroom and integrated thermal protection, offering superior reliability in production environments.

Frequently Asked Questions (FAQ)

Q: Can the MCT1117C-3.3-TP be used as a direct replacement for the MCT1117B-3.3-TP on existing PCBs?

A: Yes. Both parts use identical SOT-223 packaging with TO-261-4 and TO-261AA case designations. The pin configuration and footprint are compatible, allowing direct substitution without PCB redesign.

Q: What is the significance of the different maximum input voltage ratings (15V vs. 30V)?

A: The MCT1117C-3.3-TP accepts input voltages up to 30V, compared to 15V for the MCT1117B-3.3-TP. This expanded rating provides greater design flexibility and input voltage margin. Applications operating within the original 15V specification will function identically with the substitute part.

Q: How do the dropout voltage specifications compare?

A: The MCT1117B-3.3-TP specifies 1.3V dropout at 1A, while the MCT1117C-3.3-TP specifies 1.4V at 1A. This 0.1V difference is negligible in most applications and does not affect functional compatibility for systems designed around the original part's specifications.

Q: What is the benefit of the over-temperature protection feature in the MCT1117C-3.3-TP?

A: Over-temperature protection is an integrated safety feature that prevents device damage under thermal stress conditions. This enhancement improves reliability and system robustness without affecting normal operation within specified temperature ranges.

Q: Are there any compliance or certification differences between the two parts?

A: No. Both the MCT1117B-3.3-TP and MCT1117C-3.3-TP maintain identical REACH and ECCN classifications, confirming equivalent regulatory compliance for procurement and deployment.

Q: Why is the MCT1117B-3.3-TP listed as obsolete?

A: Obsolete status indicates that the manufacturer has discontinued production and support for this part number. The MCT1117C-3.3-TP represents the active successor in the product line, offering equivalent functionality with enhanced specifications.

Q: What is the quiescent current difference, and does it matter?

A: The MCT1117B-3.3-TP draws 10 mA quiescent current, while the MCT1117C-3.3-TP draws 5 mA. The lower quiescent current in the substitute part reduces standby power consumption, providing a marginal efficiency improvement in battery-powered or low-power applications.