LP3985IM5X-3.0 Equivalent & Substitute Parts

Part Overview

The LP3985IM5X-3.0 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed 3V positive output at 150mA with a maximum dropout voltage of 0.1V at rated current. The part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 3V regulation in SOT-23-5 packaging.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LP3985IM5X-3.0
Output Voltage (Fixed)	3V
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
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution for the LP3985IM5X-3.0 is determined by the following critical parameters:

Output Voltage: Must be fixed at 3V
Output Current Capability: Minimum 150mA
Input Voltage Range: Maximum 6V or higher
Dropout Voltage: Lower or equal to 0.1V at rated current preferred
Package Type: SOT-23-5 (SC-74A, TSOP-23-5)
Operating Temperature Range: -40°C to 125°C minimum
Protection Features: Over Current and Over Temperature protection required
Compliance: ROHS3 and REACH compliance required

Substitute parts are grouped into three categories:

Direct Equivalents (Texas Instruments LP3985 Series): Parts with identical electrical specifications and packaging, differing only in packaging format or product status.

Parametric Equivalents (Texas Instruments LP5951 Series): Parts with matching output voltage and current ratings but different dropout voltage and quiescent current characteristics, suitable for applications with relaxed input voltage constraints.

Cross-Manufacturer Equivalents: Parts from onsemi and STMicroelectronics with comparable electrical performance and SOT-23-5 packaging.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	Product Status
LP3985IM5X-3.0	Texas Instruments	3V	150mA	6V	0.1V @ 150mA	150 µA	SOT-23-5	Last Time Buy
LP3985IM5X-3.0/NOPB	Texas Instruments	3V	150mA	6V	0.1V @ 150mA	150 µA	SOT-23-5	Active
LP3985IM5-3.0/NOPB	Texas Instruments	3V	150mA	6V	0.1V @ 150mA	150 µA	SOT-23-5	Active
LP5951MF-3.0/NOPB	Texas Instruments	3V	150mA	5.5V	0.35V @ 150mA	55 µA	SOT-23-5	Active
LP5951MFX-3.0/NOPB	Texas Instruments	3V	150mA	5.5V	0.35V @ 150mA	55 µA	SOT-23-5	Active
NCP700BSN30T1G	onsemi	3V	200mA	5.5V	0.19V @ 200mA	110 µA	SOT-23-5	Active
LD3985M30R	STMicroelectronics	3V	150mA	6V	0.1V @ 150mA	150 µA	SOT-23-5	Active
LDS3985M30R	STMicroelectronics	3V	300mA	6V	0.25V @ 300mA	150 µA	SOT-23-5	Active
MAX8868EUK30+T	Analog Devices Inc./Maxim Integrated	3V	150mA	6.5V	0.165V @ 150mA	180 µA	SOT-23-5	Obsolete

Engineering Selection Recommendations

Preferred Direct Substitutes: LP3985IM5X-3.0/NOPB and LP3985IM5-3.0/NOPB are the primary alternatives. Both are Active status parts from Texas Instruments with identical electrical specifications to the main part. These provide drop-in compatibility with no design modifications required.

Secondary Alternatives for Active Designs: LD3985M30R from STMicroelectronics offers equivalent performance with Active product status and identical electrical characteristics. This part is suitable for new designs or long-term production requirements.

Higher Current Capability Option: LDS3985M30R from STMicroelectronics provides 300mA output current in the same SOT-23-5 package, supporting applications requiring increased current headroom while maintaining 3V output and 6V maximum input voltage.

Cross-Manufacturer Options: NCP700BSN30T1G from onsemi delivers 200mA output current with Active status. This part operates within a 5.5V maximum input range and includes improved PSRR performance (82dB at 1kHz).

Avoid: MAX8868EUK30+T is marked Obsolete and should not be selected for new designs or long-term production.

Compliance Verification: All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can LP5951MF-3.0/NOPB replace LP3985IM5X-3.0 directly?

A: LP5951MF-3.0/NOPB is a parametric equivalent with matching 3V output and 150mA current rating. However, it has a higher dropout voltage (0.35V vs. 0.1V) and lower quiescent current (55 µA vs. 150 µA). It is suitable only if your input voltage does not exceed 5.5V and the higher dropout voltage is acceptable for your application.

Q: What is the difference between LP3985IM5X-3.0 and LP3985IM5X-3.0/NOPB?

A: Both parts are electrically identical. The /NOPB suffix indicates "No Lead (Pb)" and represents the current production version with Active status. The original part is in Last Time Buy status. For new designs, use LP3985IM5X-3.0/NOPB.

Q: Is NCP700BSN30T1G compatible with LP3985IM5X-3.0?

A: NCP700BSN30T1G is compatible in terms of output voltage (3V), package (SOT-23-5), and operating temperature range. It provides higher output current (200mA vs. 150mA) and operates within a 5.5V maximum input range. Verify that your input voltage does not exceed 5.5V before substitution.

Q: Can I use LDS3985M30R as a substitute?

A: LDS3985M30R is suitable for applications requiring higher current capability (300mA vs. 150mA). It maintains the same 3V output voltage, 6V maximum input voltage, and SOT-23-5 package. The higher current rating makes it a compatible upgrade option.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this document are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original LP3985IM5X-3.0.

Q: What is the significance of the SOT-23-5 package?

A: SOT-23-5 (also designated SC-74A or TSOP-23-5) is a surface-mount package with five leads. All substitute parts use this identical package, ensuring PCB layout and footprint compatibility without design modifications.

Q: Why is MAX8868EUK30+T not recommended?

A: MAX8868EUK30+T is marked Obsolete, indicating discontinued production and limited availability. For new designs and long-term production, select from Active status alternatives such as LP3985IM5X-3.0/NOPB or LD3985M30R.

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