TC2185-2.5VCTTR Equivalent & Substitute Parts

Part Overview

The TC2185-2.5VCTTR is a linear voltage regulator IC manufactured by Microchip Technology, classified as a Power Management (PMIC) component. This device delivers a fixed 2.5V output at 150mA maximum current in a surface-mount SOT-23-5 package. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified when design requirements change, inventory constraints occur, or when alternative suppliers offer compatible solutions meeting the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Output Voltage (Fixed)	2.5V
Output Current	150mA
Input Voltage (Max)	6V
Voltage Dropout (Max)	0.21V @ 150mA
Quiescent Current	80 µA
Package Type	SOT-23-5 (SC-74A)
Mounting Type	Surface Mount
Operating Temperature Range	-40°C to 125°C
Control Features	Enable
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the TC2185-2.5VCTTR are classified into two categories based on electrical and mechanical compatibility:

MFR Recommended Substitutes maintain identical or superior electrical performance with the same 2.5V fixed output, 150mA current rating, and SOT-23-5 package footprint. These parts are direct functional replacements:

MIC5255-2.5YD5-TR (TSOT-23-5 variant)
MIC5255-2.5YM5-TR (SOT-23-5 variant)

Parametric Equivalents meet the core electrical requirements (2.5V output, 150mA current, SOT-23-5 package, -40°C to 125°C operation) with variations in secondary parameters such as quiescent current, dropout voltage, or PSRR performance:

MIC5317-2.5YM5-TR (Microchip, lower quiescent current)
TC1185-2.5VCT713 (Microchip, higher dropout voltage)
LD39015M25R (STMicroelectronics, lower input voltage max)
LD3985M25R (STMicroelectronics, higher quiescent current)

Higher Current Alternative for applications requiring increased output current:

MIC5259-2.5YD5-TR (300mA output, TSOT-23-5 package)

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	Product Status
TC2185-2.5VCTTR	Microchip	2.5V	150mA	6V	0.21V @ 150mA	80 µA	SOT-23-5	Active
MIC5255-2.5YD5-TR	Microchip	2.5V	150mA	6V	0.25V @ 150mA	150 µA	TSOT-23-5	Active
MIC5255-2.5YM5-TR	Microchip	2.5V	150mA	6V	0.25V @ 150mA	150 µA	SOT-23-5	Active
MIC5259-2.5YD5-TR	Microchip	2.5V	300mA	6V	0.55V @ 300mA	150 µA	TSOT-23-5	Active
MIC5317-2.5YM5-TR	Microchip	2.5V	150mA	6V	0.38V @ 150mA	39 µA	SOT-23-5	Active
TC1185-2.5VCT713	Microchip	2.5V	150mA	6V	0.4V @ 150mA	80 µA	SOT-23-5	Active
LD39015M25R	STMicroelectronics	2.5V	150mA	5.5V	0.1V @ 100mA	50 µA	SOT-23-5	Active
LD3985M25R	STMicroelectronics	2.5V	150mA	6V	0.1V @ 150mA	150 µA	SOT-23-5	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status with full RoHS3 compliance and REACH unaffected certification, matching the regulatory posture of the TC2185-2.5VCTTR.

Direct Replacement (Same Electrical Performance): MIC5255-2.5YM5-TR is the primary equivalent, offering identical 2.5V/150mA specifications in standard SOT-23-5 packaging with higher inventory availability (6,845 pcs vs. 1,590 pcs for the original part).

Lower Quiescent Current Alternative: MIC5317-2.5YM5-TR reduces quiescent current to 39 µA (vs. 80 µA), beneficial for battery-powered or low-power standby applications where the original part's 80 µA consumption is excessive.

Lower Dropout Voltage Alternative: LD39015M25R and LD3985M25R both feature 0.1V dropout voltage, compared to the TC2185's 0.21V, enabling operation with lower input supply margins or higher efficiency in power-constrained designs.

Higher Current Requirement: MIC5259-2.5YD5-TR doubles the output current to 300mA while maintaining the 2.5V output and SOT-23-5 footprint, suitable for designs requiring increased load capacity.

Package Variant Consideration: MIC5255-2.5YD5-TR uses TSOT-23-5 (thin variant) instead of standard SOT-23-5. Verify PCB layout compatibility before selection, as the thin package has reduced height but identical pin pitch.

Frequently Asked Questions (FAQ)

Q: Can MIC5255-2.5YM5-TR replace TC2185-2.5VCTTR directly on the PCB?

A: Yes. Both parts use identical SOT-23-5 footprints (SC-74A, SOT-753) with matching pin assignments. The 2.5V output, 150mA current rating, and -40°C to 125°C operating range are identical. The MIC5255 variant has slightly higher quiescent current (150 µA vs. 80 µA) and dropout voltage (0.25V vs. 0.21V), which are acceptable in most applications.

Q: What is the difference between MIC5255-2.5YD5-TR and MIC5255-2.5YM5-TR?

A: Both deliver identical electrical specifications (2.5V, 150mA, 150 µA quiescent current). The primary difference is packaging: MIC5255-2.5YD5-TR uses TSOT-23-5 (thin SOT-23-5), while MIC5255-2.5YM5-TR uses standard SOT-23-5. Verify your PCB layout supports the thin variant before substitution.

Q: When should I use MIC5317-2.5YM5-TR instead of the original TC2185?

A: Select MIC5317-2.5YM5-TR when quiescent current is a critical design parameter. Its 39 µA quiescent current (vs. 80 µA) reduces standby power consumption by approximately 50%, beneficial in battery-powered or always-on low-power applications. All other electrical parameters remain compatible.

Q: Can LD39015M25R or LD3985M25R be used as drop-in replacements?

A: Yes, both STMicroelectronics parts are pin-compatible SOT-23-5 devices with 2.5V/150mA ratings and -40°C to 125°C operation. The LD39015M25R has a lower maximum input voltage (5.5V vs. 6V), so verify your supply voltage does not exceed 5.5V. Both offer superior dropout voltage (0.1V), improving efficiency in low-margin supply designs.

Q: Is MIC5259-2.5YD5-TR compatible with TC2185-2.5VCTTR designs?

A: MIC5259-2.5YD5-TR is electrically compatible but not a direct replacement. It provides 300mA output current (vs. 150mA) in a TSOT-23-5 package. Use this part only if your design requires higher current capacity. The increased dropout voltage (0.55V @ 300mA) may affect efficiency compared to the original 0.21V specification.

Q: Do all substitute parts have the same protection features?

A: The TC2185-2.5VCTTR includes Over Current and Over Temperature protection. MIC5255 and MIC5259 variants add Under Voltage Lockout (UVLO) protection, providing additional circuit safeguarding. This enhancement is compatible with existing designs and does not require circuit modifications.

Q: What compliance certifications apply to all listed parts?

A: All parts are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity). All are classified under ECCN EAR99 and HTSUS 8542.39.0001, maintaining identical regulatory and export compliance profiles.

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