LP2985AIM5-3.0 Equivalent & Substitute Parts

Part Overview

The LP2985AIM5-3.0 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, which necessitates identification of active equivalent and substitute components for new designs and production continuity. The LP2985 series provides low-noise, low-dropout regulation suitable for applications requiring stable 3V power delivery with minimal component count.

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)
Package	SOT-23-5 (SC-74A)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature Range	-40°C to 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters: fixed output voltage (3V), output current capability (150mA), input voltage rating (16V maximum), package type (SOT-23-5), and protection features (Over Current, Over Temperature, Short Circuit). Parts are grouped into two categories:

Parametric Equivalents (Texas Instruments LP2985 Series): 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 and package requirements. These variants differ only in packaging format (Cut Tape, Digi-Reel, or Tape & Reel) and product status (Active or Last Time Buy).

Manufacturer Recommended Alternatives: LD2985BM30R (STMicroelectronics) and LT1761ES5-3#TRMPBF (Analog Devices Inc.) provide functional equivalence with minor parameter variations acceptable for most applications. LD2985BM30R maintains identical electrical performance. LT1761ES5-3#TRMPBF operates at 100mA output current (lower than 150mA) and features improved dropout voltage (0.45V @ 100mA) and higher PSRR (65dB @ 120Hz).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Product Status	RoHS Status
LP2985AIM5-3.0	Texas Instruments	3V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Obsolete	RoHS 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 in existing designs, select from the Texas Instruments LP2985 series variants (LP2985-30DBVR, LP2985A-30DBVR, LP2985AIM5-3.0/NOPB, LP2985IM5-3.0/NOPB, or LP2985IM5X-3.0/NOPB). These parts are Active status, ROHS3 compliant, and provide identical electrical performance and package compatibility. LP2985-30DBVR and LP2985A-30DBVR offer the highest inventory availability (80,400 and 23,100 units respectively).

For new designs where 150mA output current is not a strict requirement, LD2985BM30R (STMicroelectronics) is a qualified alternative with Active status and ROHS3 compliance. The quiescent current is slightly elevated (150 µA vs. 95 µA), which may impact low-power applications.

LT1761ES5-3#TRMPBF (Analog Devices Inc.) is suitable only for applications requiring maximum 100mA output current. This part offers superior dropout voltage performance (0.45V @ 100mA) and higher PSRR (65dB @ 120Hz), plus higher maximum input voltage rating (20V). It is not recommended as a direct replacement for 150mA load requirements.

Frequently Asked Questions (FAQ)

Q: Can LP2985-30DBVR directly replace LP2985AIM5-3.0?

A: Yes. Both parts deliver 3V at 150mA with identical electrical specifications and SOT-23-5 packaging. LP2985-30DBVR is Active status with ROHS3 compliance, whereas the original part is Obsolete and RoHS non-compliant. The primary difference is packaging format (Digi-Reel vs. Cut Tape).

Q: What is the difference between LP2985AIM5-3.0/NOPB and LP2985IM5-3.0/NOPB?

A: Both are Texas Instruments parts with identical electrical specifications. The "A" designation in LP2985AIM5 indicates a specific product variant. Both are Active status and ROHS3 compliant. Selection depends on packaging availability and supplier inventory.

Q: Can LD2985BM30R be used as a drop-in replacement?

A: LD2985BM30R is functionally equivalent for 150mA applications. It maintains the same output voltage, current rating, and package. The quiescent current is 150 µA (vs. 95 µA), which increases standby power consumption by approximately 55 µA. Dropout voltage is marginally higher (0.575V vs. 0.58V). Verify thermal and power budget impact before substitution.

Q: Why is LT1761ES5-3#TRMPBF listed as an alternative if it only supports 100mA?

A: LT1761ES5-3#TRMPBF is included as a manufacturer-recommended alternative for applications where output current does not exceed 100mA. It offers superior performance characteristics (lower dropout voltage, higher PSRR, higher input voltage rating) and is suitable for redesigned circuits that can operate within its current specification.

Q: Are all substitute parts compatible with the SOT-23-5 footprint?

A: Yes. All listed parts use SOT-23-5 or TSOT-23-5 packaging (functionally equivalent footprints). PCB layout compatibility is assured. Verify lead spacing and thermal pad requirements with component datasheets for high-current applications.

Q: What is the significance of the "/NOPB" suffix?

A: The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging, confirming RoHS compliance. Parts with this designation are suitable for applications requiring RoHS certification.

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