LP3985IM5-2.7 Equivalent & Substitute Parts

Part Overview

The LP3985IM5-2.7 is a linear voltage regulator IC from Texas Instruments designed to deliver a fixed 2.7V output at 150mA in a SOT-23-5 surface mount package. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and production continuity. The regulator features enable control, over-current protection, over-temperature protection, and short-circuit protection, operating across the industrial temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.7V
Output Current	150mA
Input Voltage (Max)	6V
Dropout Voltage (Max)	0.1V @ 150mA
Quiescent Current	150 µA
Package	SOT-23-5 (SC-74A)
Operating Temperature	-40°C to 125°C
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution for the LP3985IM5-2.7 is determined by the following critical parameters: fixed 2.7V output voltage, SOT-23-5 package compatibility, operating temperature range of -40°C to 125°C, enable control feature, and surface mount mounting type. Parts are grouped into two categories:

Direct Parametric Equivalents (150mA Output Current): Parts meeting all key specifications including 150mA output current, 2.7V fixed output, and SOT-23-5 packaging. These include LP3985IM5-2.7/NOPB (Texas Instruments), LD3985M27R (STMicroelectronics), MIC5255-2.7YM5-TR (Microchip Technology), and MIC5256-2.7YM5-TR (Microchip Technology).

Functional Equivalents with Reduced Output Current (50mA or 100mA): Parts with identical voltage output and package but lower current ratings. These include TC2014-2.7VCTTR (50mA), TC1014-2.7VCT713 (50mA), TC2015-2.7VCTTR (100mA), TC1015-2.7VCT713 (100mA), and TC1185-2.7VCT713 (150mA). These are suitable only for applications requiring equal or lower current than their rated output.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	Product Status	RoHS Status
LP3985IM5-2.7	Texas Instruments	2.7V	150mA	6V	0.1V @ 150mA	150 µA	SOT-23-5	Obsolete	RoHS Non-Compliant
LP3985IM5-2.7/NOPB	Texas Instruments	2.7V	150mA	6V	0.1V @ 150mA	150 µA	SOT-23-5	Active	ROHS3 Compliant
LD3985M27R	STMicroelectronics	2.7V	150mA	6V	0.1V @ 150mA	150 µA	SOT-23-5	Active	ROHS3 Compliant
MIC5255-2.7YD5-TR	Microchip Technology	2.7V	150mA	6V	0.25V @ 150mA	150 µA	TSOT-23-5	Active	ROHS3 Compliant
MIC5255-2.7YM5-TR	Microchip Technology	2.7V	150mA	6V	0.25V @ 150mA	150 µA	SOT-23-5	Active	ROHS3 Compliant
MIC5256-2.7YM5-TR	Microchip Technology	2.7V	150mA	6V	0.25V @ 150mA	150 µA	SOT-23-5	Active	ROHS3 Compliant
TC1014-2.7VCT713	Microchip Technology	2.7V	50mA	6V	0.12V @ 50mA	80 µA	SOT-23-5	Active	ROHS3 Compliant
TC1015-2.7VCT713	Microchip Technology	2.7V	100mA	6V	0.25V @ 100mA	80 µA	SOT-23-5	Active	ROHS3 Compliant
TC1185-2.7VCT713	Microchip Technology	2.7V	150mA	6V	0.4V @ 150mA	80 µA	SOT-23-5	Active	ROHS3 Compliant
TC2014-2.7VCTTR	Microchip Technology	2.7V	50mA	6V	0.07V @ 50mA	80 µA	SOT-23-5	Active	ROHS3 Compliant
TC2015-2.7VCTTR	Microchip Technology	2.7V	100mA	6V	0.14V @ 100mA	80 µA	SOT-23-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete LP3985IM5-2.7 in new designs, LP3985IM5-2.7/NOPB from Texas Instruments is the primary choice, offering identical electrical specifications with active product status and ROHS3 compliance. LD3985M27R from STMicroelectronics provides an alternative from a different manufacturer with equivalent performance and compliance certifications. MIC5255-2.7YM5-TR and MIC5256-2.7YM5-TR from Microchip Technology are functionally equivalent with slightly higher dropout voltage (0.25V vs 0.1V) but maintain 150mA output capability and active status.

For applications with reduced current requirements, TC1185-2.7VCT713 supports the full 150mA specification with higher dropout voltage (0.4V). TC1015-2.7VCT713 and TC2015-2.7VCTTR are suitable for 100mA applications. TC1014-2.7VCT713 and TC2014-2.7VCTTR are suitable for 50mA applications. All substitute parts carry ROHS3 compliance and active product status, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can TC1014-2.7VCT713 or TC2014-2.7VCTTR replace LP3985IM5-2.7 directly?

A: These parts are not direct replacements. Both are rated for 50mA maximum output current, while the LP3985IM5-2.7 is rated for 150mA. They are suitable only for applications requiring 50mA or less. Using them in circuits designed for 150mA will result in device failure or thermal shutdown.

Q: What is the difference between MIC5255-2.7YD5-TR and MIC5255-2.7YM5-TR?

A: Both parts are electrically identical with 2.7V output and 150mA current rating. The primary difference is package designation: MIC5255-2.7YD5-TR uses TSOT-23-5 (thin SOT-23-5) packaging, while MIC5255-2.7YM5-TR uses standard SOT-23-5 packaging. Verify PCB footprint compatibility before selection.

Q: Why does TC1185-2.7VCT713 have higher dropout voltage (0.4V) compared to LP3985IM5-2.7 (0.1V)?

A: Dropout voltage is a device-specific characteristic determined by internal circuit design. TC1185-2.7VCT713 has higher dropout voltage, which may affect performance in low-input-voltage applications. Verify dropout voltage requirements in your circuit before substitution.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status. The original LP3985IM5-2.7 is RoHS non-compliant, making compliant substitutes necessary for new designs subject to RoHS regulations.

Q: Can I use MIC5256-2.7YM5-TR instead of MIC5255-2.7YM5-TR?

A: Yes. Both parts share identical electrical specifications for 2.7V output, 150mA current, and SOT-23-5 packaging. The base product numbers differ (MIC5256 vs MIC5255), but they are functionally interchangeable for this voltage and current rating.

Q: What is the significance of the /NOPB suffix in LP3985IM5-2.7/NOPB?

A: The /NOPB suffix indicates "No Lead (Pb)" or lead-free packaging, confirming RoHS compliance. This is the active production variant of the original LP3985IM5-2.7 and is the recommended direct replacement.

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