LP2985AIM5X-3.0 Equivalent & Substitute Parts

Part Overview

The LP2985AIM5X-3.0 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3V output at 150mA in a SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design updates. The device provides positive fixed output configuration with integrated enable control and comprehensive protection features including over-current, over-temperature, and short-circuit protection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.58V @ 150mA
Quiescent Current	95 µA
PSRR	45dB (1kHz)
Operating Temperature Range	-40°C to 125°C
Package	SOT-23-5 (SC-74A)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitute parts for the LP2985AIM5X-3.0 are classified based on strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Fixed 3V output voltage
150mA output current capability
Maximum 16V input voltage rating
SOT-23-5 package configuration
Enable control feature
Operating temperature range -40°C to 125°C
Over-current and over-temperature protection

Grouping Logic:

Group 1: Texas Instruments LP2985 Series (Parametric Equivalents) Parts LP2985-30DBVR, LP2985-30DBVT, LP2985A-30DBVR, LP2985A-30DBVT, LP2985AIM5-3.0/NOPB, LP2985AIM5X-3.0/NOPB, LP2985IM5-3.0/NOPB, and LP2985IM5X-3.0/NOPB meet all electrical specifications identically. Differences exist only in packaging format (Cut Tape, Digi-Reel, or Tape & Reel) and product status (Active vs. Last Time Buy vs. Obsolete).

Group 2: STMicroelectronics LD2985BM30R (Manufacturer Recommended) The LD2985BM30R from STMicroelectronics provides equivalent 3V fixed output and 150mA current rating in SOT-23-5 package. Minor parameter variations include dropout voltage of 0.575V @ 150mA (versus 0.58V) and quiescent current of 150 µA (versus 95 µA). Short-circuit protection differs in implementation.

Group 3: Analog Devices LT1761ES5-3#TRMPBF (Manufacturer Recommended) The LT1761ES5-3#TRMPBF provides 3V fixed output in TSOT-23-5 package with reduced output current of 100mA. Input voltage rating extends to 20V. Dropout voltage is lower at 0.45V @ 100mA. PSRR is superior at 65dB (120Hz). This part is suitable only for applications requiring less than 100mA output current.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Product Status	RoHS Status
LP2985AIM5X-3.0	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Obsolete	Non-compliant
LP2985-30DBVR	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985-30DBVT	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985A-30DBVR	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985A-30DBVT	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985AIM5-3.0/NOPB	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985AIM5X-3.0/NOPB	National Semiconductor	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	Not specified
LP2985IM5-3.0/NOPB	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5X-3.0/NOPB	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LD2985BM30R	STMicroelectronics	3V	150mA	16V	0.575V @ 150mA	150 µA	SOT-23-5	Active	ROHS3 Compliant
LT1761ES5-3#TRMPBF	Analog Devices Inc.	3V	100mA	20V	0.45V @ 100mA	Not specified	TSOT-23-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Full Electrical Equivalence): Select from the Texas Instruments LP2985 series variants (LP2985-30DBVR, LP2985-30DBVT, LP2985A-30DBVR, LP2985A-30DBVT, LP2985AIM5-3.0/NOPB, LP2985AIM5X-3.0/NOPB, LP2985IM5-3.0/NOPB, LP2985IM5X-3.0/NOPB). These parts provide identical electrical performance and are available in active product status with ROHS3 compliance. Selection among these variants depends on packaging requirements: Cut Tape & Digi-Reel for LP2985-30DBVR and LP2985IM5X-3.0/NOPB, Tape & Reel for LP2985-30DBVT, LP2985A-30DBVT, and LP2985AIM5-3.0/NOPB, or Cut Tape & Digi-Reel for LP2985A-30DBVR.

For Alternative Manufacturer Selection: The STMicroelectronics LD2985BM30R is an active product with ROHS3 compliance, offering equivalent 3V output and 150mA current in SOT-23-5 package. Quiescent current is slightly elevated at 150 µA compared to 95 µA in the LP2985 series, and dropout voltage is marginally lower at 0.575V. This part is suitable for applications where manufacturer diversification is required.

For Current-Limited Applications: The Analog Devices LT1761ES5-3#TRMPBF is applicable only for designs requiring maximum 100mA output current. This part offers superior dropout voltage performance (0.45V @ 100mA) and extended input voltage rating (20V). TSOT-23-5 package is mechanically compatible with SOT-23-5 footprints. This selection is not suitable for applications requiring the full 150mA output capability.

Frequently Asked Questions (FAQ)

Q: Can LP2985-30DBVR directly replace LP2985AIM5X-3.0 in production? A: Yes. Both parts deliver identical electrical specifications: 3V fixed output, 150mA current, 0.58V dropout voltage, and 95 µA quiescent current. The primary difference is product status (Active vs. Obsolete) and packaging format. LP2985-30DBVR is available in Cut Tape & Digi-Reel format.

Q: What is the difference between LP2985A and LP2985I variants? A: Both variants meet identical electrical specifications for the LP2985AIM5X-3.0 substitution. The designations reflect internal grading or manufacturing process variations, but electrical performance remains equivalent across all parameters listed.

Q: Is the LD2985BM30R from STMicroelectronics a complete substitute? A: The LD2985BM30R provides functional equivalence with 3V output and 150mA current in SOT-23-5 package. Quiescent current is 150 µA versus 95 µA in the LP2985 series, and dropout voltage is 0.575V versus 0.58V. These minor differences are within typical application tolerances for linear regulator designs.

Q: Can the LT1761ES5-3#TRMPBF replace the LP2985AIM5X-3.0? A: The LT1761ES5-3#TRMPBF is suitable only for applications requiring maximum 100mA output current. The LP2985AIM5X-3.0 is rated for 150mA. If your design requires the full 150mA capability, this part is not appropriate. For applications limited to 100mA or less, the LT1761ES5-3#TRMPBF offers superior dropout voltage and extended input voltage rating.

Q: Are all substitute parts ROHS3 compliant? A: All Texas Instruments LP2985 variants, STMicroelectronics LD2985BM30R, and Analog Devices LT1761ES5-3#TRMPBF are ROHS3 compliant. The original LP2985AIM5X-3.0 is RoHS non-compliant. Compliance status should be verified against your specific regulatory requirements.

Q: What packaging formats are available for LP2985 substitutes? A: Texas Instruments LP2985 series substitutes are available in three packaging formats: Cut Tape (CT), Cut Tape & Digi-Reel (CT & Digi-Reel), and Tape & Reel (TR). All maintain SOT-23-5 package configuration. Selection depends on your procurement and assembly process requirements.

Q: Is the SOT-23-5 package footprint identical across all substitutes? A: Yes. All Texas Instruments LP2985 variants and STMicroelectronics LD2985BM30R use SC-74A SOT-23-5 package. The Analog Devices LT1761ES5-3#TRMPBF uses TSOT-23-5 (thin variant), which is mechanically compatible with standard SOT-23-5 footprints.

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