LP3985IM5-2.5 Equivalent & Substitute Parts

Part Overview

The LP3985IM5-2.5 is a linear voltage regulator IC manufactured by Texas Instruments, delivering a fixed 2.5V output at 150mA in a SOT-23-5 surface mount package. This device is classified as Last Time Buy, indicating end-of-life status. The part provides positive fixed output configuration with integrated enable control, over-current protection, over-temperature protection, and short-circuit protection across an operating temperature range of -40°C to 125°C.

Due to Last Time Buy status, identifying equivalent and substitute parts is essential for design continuity and long-term supply chain planning. Substitute parts are selected based on matching electrical performance parameters, output voltage specification, current delivery capability, and package compatibility.

Key Parameters

Parameter	LP3985IM5-2.5
Manufacturer	Texas Instruments
Output Voltage (Fixed)	2.5V
Output Current	150mA
Input Voltage (Max)	6V
Voltage Dropout (Max)	0.1V @ 150mA
Quiescent Current	150 µA
Package	SOT-23-5 (SC-74A)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts are grouped into two categories based on parametric equivalence and manufacturer recommendation status:

Parametric Equivalents maintain identical or functionally equivalent electrical specifications to the LP3985IM5-2.5, including 2.5V fixed output, 150mA output current, and SOT-23-5 packaging. These parts are direct functional replacements with matching key parameters: output voltage, output current, input voltage maximum, dropout voltage, quiescent current, package type, control features, and protection features.

Manufacturer Recommended Alternatives include parts from alternative manufacturers (STMicroelectronics, Analog Devices Inc., Maxim Integrated) that meet the core functional requirements of 2.5V fixed output at 150mA in SOT-23-5 packaging, with variations in secondary parameters such as quiescent current, dropout voltage, or PSRR characteristics. These alternatives are suitable for applications where the primary electrical specifications are met, even if secondary performance metrics differ.

Key parameters determining substitution eligibility:

Output voltage: 2.5V fixed
Output current: 150mA minimum
Package: SOT-23-5 (SC-74A)
Input voltage maximum: 5.5V to 6.5V
Operating temperature: -40°C to 125°C
Control features: Enable function
Protection: Over-current and over-temperature protection

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout (Max)	Quiescent Current	Package	Status
LP3985IM5-2.5	Texas Instruments	2.5V	150mA	6V	0.1V @ 150mA	150 µA	SOT-23-5	Last Time Buy
LP3985IM5-2.5/NOPB	Texas Instruments	2.5V	150mA	6V	0.1V @ 150mA	150 µA	SOT-23-5	Active
LP3985IM5X-2.5/NOPB	Texas Instruments	2.5V	150mA	6V	0.1V @ 150mA	150 µA	SOT-23-5	Active
LP5951MF-2.5/NOPB	Texas Instruments	2.5V	150mA	5.5V	0.35V @ 150mA	55 µA	SOT-23-5	Active
LP5951MFX-2.5/NOPB	Texas Instruments	2.5V	150mA	5.5V	0.35V @ 150mA	55 µA	SOT-23-5	Active
LD3985M25R	STMicroelectronics	2.5V	150mA	6V	0.1V @ 150mA	150 µA	SOT-23-5	Active
LDS3985M25R	STMicroelectronics	2.5V	300mA	6V	0.25V @ 300mA	150 µA	SOT-23-5	Active
LTC1844ES5-2.5#TRMPBF	Analog Devices Inc.	2.5V	150mA	6.5V	0.2V @ 150mA	80 µA	TSOT-23-5	Active
LTC1844ES5-2.5#TRPBF	Analog Devices Inc.	2.5V	150mA	6.5V	0.2V @ 150mA	80 µA	TSOT-23-5	Active
MAX8868EUK25+T	Analog Devices Inc./Maxim Integrated	2.5V	150mA	6.5V	0.165V @ 150mA	180 µA	SOT-23-5	Active

Engineering Selection Recommendations

Primary Substitutes (Texas Instruments, Active Status): LP3985IM5-2.5/NOPB and LP3985IM5X-2.5/NOPB are direct parametric equivalents from the same manufacturer with identical electrical specifications and Active product status. These parts provide the most straightforward replacement path with no design modifications required.

Secondary Substitutes (Texas Instruments, Active Status): LP5951MF-2.5/NOPB and LP5951MFX-2.5/NOPB are Texas Instruments alternatives with identical output voltage and current specifications. These parts feature reduced quiescent current (55 µA versus 150 µA) and higher maximum input voltage tolerance (5.5V), making them suitable for low-power applications. The increased dropout voltage (0.35V versus 0.1V) must be evaluated against specific circuit requirements.

Alternative Manufacturer Substitutes (Active Status): LD3985M25R from STMicroelectronics provides parametric equivalence to the original part with identical electrical specifications and Active status. LTC1844ES5-2.5 variants from Analog Devices Inc. offer improved quiescent current performance (80 µA) and higher input voltage tolerance (6.5V), with slightly increased dropout voltage (0.2V). MAX8868EUK25+T from Maxim Integrated delivers improved dropout voltage performance (0.165V) and higher input voltage tolerance (6.5V).

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 rating, and operating temperature range of -40°C to 125°C, ensuring regulatory and environmental compatibility with the original part.

Frequently Asked Questions (FAQ)

Q: Can LP5951MF-2.5/NOPB replace LP3985IM5-2.5 directly? A: LP5951MF-2.5/NOPB is electrically compatible for applications where the 0.35V dropout voltage is acceptable. The reduced quiescent current (55 µA) provides power efficiency benefits. Circuit validation is required if dropout voltage performance is critical to system operation.

Q: What is the difference between SOT-23-5 and TSOT-23-5 packages? A: TSOT-23-5 is a thin variant of SOT-23-5 with reduced height. Both packages are mechanically and electrically compatible for standard PCB assembly. Verify PCB footprint specifications if switching between these package variants.

Q: Are all substitute parts ROHS3 compliant? A: All substitute parts listed maintain ROHS3 compliance status, ensuring compatibility with regulatory requirements and environmental standards applicable to the original LP3985IM5-2.5.

Q: Which substitute offers the best dropout voltage performance? A: MAX8868EUK25+T provides the lowest typical dropout voltage at 0.165V @ 150mA, followed by LTC1844ES5-2.5 variants at 0.2V @ 150mA. The original LP3985IM5-2.5 and LD3985M25R both specify 0.1V @ 150mA maximum dropout.

Q: Can LDS3985M25R be used as a substitute despite higher current rating? A: LDS3985M25R is rated for 300mA output current, exceeding the 150mA requirement of the original part. This part is functionally compatible and suitable for applications requiring higher current delivery. The increased dropout voltage at rated current (0.25V @ 300mA) must be evaluated for specific circuit requirements.

Q: What is the inventory status of substitute parts? A: LP3985IM5X-2.5/NOPB maintains the highest inventory level at 5,000,300 units. LP5951MFX-2.5/NOPB provides 17,930 units. All listed substitutes maintain active production status with available inventory for procurement.

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