LP2985IM5-1.8 Equivalent & Substitute Parts

Part Overview

The LP2985IM5-1.8 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output at 150mA in SOT-23-5 surface mount packaging. This part is classified as Not For New Designs, indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary for ongoing production support, legacy system maintenance, and design continuity where this regulator specification remains applicable.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	1.8V
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)
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the LP2985IM5-1.8 is determined by strict equivalence across the following critical parameters:

Output voltage: 1.8V fixed
Output current capability: 150mA minimum
Input voltage rating: 16V maximum
Dropout voltage: 0.58V @ 150mA maximum
Package type: SOT-23-5 (SC-74A)
Mounting: Surface mount
Operating temperature range: -40°C ~ 125°C
Protection features: Over current, over temperature, short circuit

Substitute parts are grouped into two categories:

Parametric Equivalents (Texas Instruments LP2985 Series): Parts sharing identical electrical specifications and the same base product number (LP2985 or LP2985A variants). These include packaging variants (Tape & Reel, Cut Tape, Digi-Reel) and product status variations (Active, Last Time Buy).

Manufacturer Recommended Equivalent (STMicroelectronics LD2985BM18R): A cross-manufacturer substitute meeting all critical electrical parameters with minor variations in quiescent current (150 µA vs. 95 µA) and supply current maximum (4 mA vs. 2.5 mA), within acceptable tolerance for this application class.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage	Quiescent Current	Package	Product Status	RoHS Status
LP2985IM5-1.8	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Not For New Designs	RoHS non-compliant
LP2985-18DBVR	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985-18DBVT	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985A-18DBVJ	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985A-18DBVR	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985A-18DBVT	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985AIM5-1.8/NOPB	National Semiconductor	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	Not specified
LP2985AIM5X-1.8/NOPB	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5-1.8/NOPB	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5X-1.8/NOPB	Texas Instruments	1.8V	150mA	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LD2985BM18R	STMicroelectronics	1.8V	150mA	0.575V @ 150mA	150 µA	SOT-23-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Active Production: LP2985-18DBVR, LP2985A-18DBVR, LP2985AIM5X-1.8/NOPB, and LP2985IM5X-1.8/NOPB are all Active status parts with ROHS3 compliance, making them suitable for new production builds and long-term supply continuity.

For Legacy System Support: LP2985-18DBVT and LP2985A-18DBVT are Last Time Buy status parts with ROHS3 compliance and adequate inventory (1821 and 4428 units respectively), suitable for limited production runs of existing designs.

For Cross-Manufacturer Substitution: LD2985BM18R from STMicroelectronics meets all critical electrical parameters with ROHS3 compliance and Active status. The quiescent current increase from 95 µA to 150 µA and supply current maximum increase from 2.5 mA to 4 mA remain within acceptable operational margins for this regulator class.

RoHS Compliance Consideration: The original LP2985IM5-1.8 is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, supporting compliance requirements for new designs and updated production standards.

Frequently Asked Questions (FAQ)

Q: Can LP2985-18DBVR directly replace LP2985IM5-1.8 in existing designs?

A: Yes. Both parts share identical electrical specifications (1.8V output, 150mA current, 0.58V dropout voltage, 95 µA quiescent current) and the same SOT-23-5 package. The primary difference is product status and RoHS compliance. LP2985-18DBVR is Active status with ROHS3 compliance, while LP2985IM5-1.8 is Not For New Designs and RoHS non-compliant.

Q: What is the difference between LP2985 and LP2985A variants?

A: Both LP2985 and LP2985A variants in this list maintain identical electrical specifications for the 1.8V output configuration. The "A" designation indicates a product line revision. All variants are functionally interchangeable for this application.

Q: Does packaging type (Tape & Reel vs. Cut Tape) affect electrical performance?

A: No. Packaging type (TR, CT, or Digi-Reel) affects only handling, storage, and assembly logistics. Electrical specifications and performance remain identical across all packaging variants of the same part number base.

Q: Can LD2985BM18R from STMicroelectronics be used as a substitute?

A: Yes, with operational considerations. LD2985BM18R meets all critical electrical parameters and is ROHS3 compliant with Active status. The quiescent current is 150 µA (versus 95 µA) and maximum supply current is 4 mA (versus 2.5 mA). These increases are within acceptable tolerance for linear regulator applications in this class and do not affect output voltage accuracy or load regulation.

Q: Why is the original LP2985IM5-1.8 marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status. Existing inventory remains available for legacy system support, but new designs should use Active status alternatives such as LP2985-18DBVR or LP2985IM5X-1.8/NOPB to ensure long-term supply continuity and compliance with current manufacturing standards.

Q: Are all substitute parts rated for -40°C to 125°C operation?

A: Yes. All parts listed maintain the same operating temperature range of -40°C to 125°C, ensuring thermal performance equivalence across industrial and extended temperature applications.

Q: What protection features are included in substitute parts?

A: All Texas Instruments LP2985 variants include over current, over temperature, and short circuit protection. The STMicroelectronics LD2985BM18R includes over current and over temperature protection. All parts include enable control features.

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