MCT1117B-1.8-TP Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MCT1117B-1.8-TP is a linear voltage regulator IC manufactured by Micro Commercial Co, designed to provide a fixed positive 1.8V 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-1.8-TP operates across an input voltage range up to 15V with a maximum dropout voltage of 1.3V at full load current.

Substiute Parts

MCT1117B-1.8-TP

Micro Commercial CoIn Stock: 796MCT1117B-1.8-TP Datasheet

Current PartRFQ

MCT1117C-1.8-TP

Micro Commercial CoIn Stock: 1136MCT1117C-1.8-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MCT1117B-1.8-TP is determined by the following critical parameters that must remain compatible:

Fixed Parameters (Must Match):

• Output voltage: 1.8V fixed
• Output current capacity: 1A minimum
• Package type: SOT-223 (TO-261-4, TO-261AA)
• Mounting type: Surface mount
• Output configuration: Positive fixed output
• Manufacturer series compatibility: MCT1117 family

Allowable Variation Parameters:

• Input voltage maximum: May exceed 15V (higher ratings are acceptable)
• Dropout voltage: May vary within acceptable operating margins
• Quiescent current: May differ
• PSRR specification: May differ
• Operating temperature range: May differ
• Product status: Active parts preferred over obsolete

The MCT1117C-1.8-TP qualifies as a direct substitute based on identical output voltage, current rating, package configuration, and manufacturer family alignment, while offering improved specifications in input voltage rating and active product status.

Parameter Comparison

Engineering Selection Recommendations

The MCT1117C-1.8-TP is the direct substitute for the obsolete MCT1117B-1.8-TP based on the following engineering criteria:

Product Status Alignment: The MCT1117C-1.8-TP maintains active product status, ensuring long-term availability and continued manufacturer support, whereas the MCT1117B-1.8-TP is obsolete and subject to supply discontinuation.

Electrical Compatibility: Both devices deliver identical fixed 1.8V output at 1A current capacity. The MCT1117C-1.8-TP provides an enhanced input voltage rating of 30V compared to 15V, offering greater design margin for input supply variations without compromising performance in applications designed for the original 15V specification.

Package and Mounting Equivalence: Both parts utilize identical SOT-223 surface mount packaging (TO-261-4, TO-261AA), enabling direct PCB layout compatibility without redesign.

Regulatory Compliance: Both parts maintain REACH Unaffected status and EAR99 ECCN classification, ensuring equivalent compliance posture for procurement and export documentation.

Enhanced Features: The MCT1117C-1.8-TP includes over-temperature protection, a feature absent in the MCT1117B-1.8-TP, providing additional circuit reliability without functional trade-offs.

Frequently Asked Questions (FAQ)

Q: Can the MCT1117C-1.8-TP be used as a direct replacement for MCT1117B-1.8-TP in existing designs?

A: Yes. Both devices provide identical 1.8V fixed output at 1A in SOT-223 packaging. The MCT1117C-1.8-TP is electrically and mechanically compatible with PCB layouts designed for the MCT1117B-1.8-TP. No circuit modifications or board redesign are required.

Q: What is the significance of the higher 30V input rating on the MCT1117C-1.8-TP?

A: The MCT1117C-1.8-TP accepts input voltages up to 30V, compared to 15V for the MCT1117B-1.8-TP. This expanded rating provides additional design margin and allows the substitute part to function in applications with higher input supply voltages. For applications limited to 15V input, both parts operate identically.

Q: Does the dropout voltage difference between the two parts affect circuit performance?

A: The dropout voltage difference is minimal (1.3V versus 1.4V at 1A). Both values are within typical linear regulator specifications. The MCT1117C-1.8-TP's slightly higher dropout voltage does not introduce functional incompatibility in standard applications.

Q: Why does the MCT1117B-1.8-TP show higher supply current (10 mA) compared to the MCT1117C-1.8-TP (5 mA quiescent)?

A: The MCT1117C-1.8-TP demonstrates improved quiescent current performance at 5 mA, representing enhanced power efficiency compared to the 10 mA specification of the MCT1117B-1.8-TP. This improvement reduces standby power consumption in battery-powered or low-power applications.

Q: Are there any temperature range limitations when substituting the MCT1117C-1.8-TP?

A: The MCT1117C-1.8-TP operates across -20°C to 125°C, compared to -25°C to 125°C for the MCT1117B-1.8-TP. For applications requiring operation below -20°C, the original MCT1117B-1.8-TP specification must be maintained. For standard industrial and commercial temperature ranges, the MCT1117C-1.8-TP is fully compatible.

Q: What is the advantage of the over-temperature protection feature in the MCT1117C-1.8-TP?

A: Over-temperature protection automatically limits device operation when junction temperature exceeds safe thresholds, preventing thermal damage during fault conditions or thermal stress. This feature enhances circuit reliability without requiring external protection components.

Q: Do both parts require identical PCB layout and thermal management?

A: Yes. Both devices use identical SOT-223 packaging and thermal characteristics. Existing PCB layouts, thermal vias, and copper area designs for the MCT1117B-1.8-TP are directly applicable to the MCT1117C-1.8-TP without modification.