LP2985IM5-2.8 Equivalent & Substitute Parts

Part Overview

The LP2985IM5-2.8 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 2.8V output at 150mA in a SOT-23-5 surface mount package. This device is classified as Obsolete, making identification of equivalent and substitute parts essential for ongoing production support, maintenance, and design continuity. The regulator incorporates enable control, over-current protection, over-temperature protection, and short-circuit protection, operating across the industrial temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.8V
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)
Control Features	Enable
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C to 125°C

Substitute Part Grouping Explanation

Substitution eligibility for the LP2985IM5-2.8 is determined by the following critical parameters: fixed output voltage of 2.8V, minimum output current of 150mA, maximum input voltage of 16V, SOT-23-5 package compatibility, and protection feature set (over-current, over-temperature, short-circuit). Parts meeting these electrical and mechanical specifications are classified as parametric equivalents. Variations in product status, RoHS compliance, packaging format (tape & reel vs. cut tape), and quiescent current within acceptable tolerances do not disqualify substitution eligibility.

The substitute parts identified fall into two categories: Texas Instruments variants of the LP2985 series with identical electrical specifications, and manufacturer-recommended alternatives from STMicroelectronics and Analog Devices that meet or exceed the core electrical requirements while maintaining package compatibility.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 150mA	Quiescent Current	Package	Product Status	RoHS Status
LP2985IM5-2.8	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Obsolete	RoHS non-compliant
LP2985-28DBVR	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985-28DBVT	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Obsolete	ROHS3 Compliant
LP2985A-28DBVR	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985A-28DBVT	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Obsolete	ROHS3 Compliant
LP2985AIM5-2.8	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Not For New Designs	RoHS non-compliant
LP2985AIM5X-2.8/NOPB	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5-2.8/NOPB	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5X-2.8/NOPB	Texas Instruments	2.8V	150mA	16V	0.58V	95 µA	SOT-23-5	Active	ROHS3 Compliant
LD2985BM28R	STMicroelectronics	2.8V	150mA	16V	0.575V	150 µA	SOT-23-5	Active	ROHS3 Compliant
LT1761ES5-2.8#TRMPBF	Analog Devices Inc.	2.8V	100mA	20V	0.45V @ 100mA	Not specified	TSOT-23-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring direct pin-for-pin and electrical equivalence with the LP2985IM5-2.8, the Texas Instruments LP2985 series variants—specifically LP2985-28DBVR, LP2985IM5-2.8/NOPB, and LP2985IM5X-2.8/NOPB—provide identical electrical performance with Active product status and ROHS3 compliance. These parts are recommended for new production and ongoing supply continuity.

The LP2985A variants (LP2985A-28DBVR, LP2985A-28DBVT, LP2985AIM5-2.8) maintain electrical equivalence but carry Last Time Buy or Not For New Designs status, limiting their suitability for long-term production commitments.

The STMicroelectronics LD2985BM28R is an Active, ROHS3-compliant alternative with marginally higher quiescent current (150 µA vs. 95 µA) and equivalent dropout voltage performance. This part is suitable for applications where supply continuity from a secondary manufacturer is prioritized.

The Analog Devices LT1761ES5-2.8#TRMPBF is an Active alternative with superior input voltage rating (20V vs. 16V) and lower dropout voltage (0.45V @ 100mA). However, its 100mA output current rating is below the 150mA requirement of the original part, restricting its use to applications with reduced current demands.

Frequently Asked Questions (FAQ)

Q: Can LP2985-28DBVR directly replace LP2985IM5-2.8 in existing designs?

A: Yes. Both parts deliver identical electrical specifications: 2.8V fixed output, 150mA output current, 0.58V dropout voltage at 150mA, and SOT-23-5 package. The primary difference is packaging format (tape & reel vs. tube) and product status (Active vs. Obsolete). Electrical performance and pinout are identical.

Q: What is the difference between LP2985IM5-2.8 and LP2985AIM5-2.8?

A: Both parts are electrically identical with 2.8V output and 150mA current rating. The "A" designation indicates a different manufacturing variant. LP2985AIM5-2.8 carries Not For New Designs status, while LP2985IM5-2.8 is Obsolete. For new designs, use LP2985IM5-2.8/NOPB or LP2985AIM5X-2.8/NOPB, both Active.

Q: Is LD2985BM28R from STMicroelectronics a suitable replacement?

A: Yes, with minor operational differences. The LD2985BM28R meets all core electrical requirements: 2.8V output, 150mA current, 16V input maximum, and SOT-23-5 package. Quiescent current is higher (150 µA vs. 95 µA), which may impact low-power applications. Dropout voltage is marginally lower (0.575V vs. 0.58V). The part is Active and ROHS3 compliant.

Q: Why is the LT1761ES5-2.8#TRMPBF listed as a substitute if it only supports 100mA?

A: The LT1761ES5-2.8#TRMPBF is listed as a manufacturer-recommended alternative for applications where 100mA output current is sufficient. It offers superior performance characteristics: 20V input rating, 0.45V dropout voltage, and Active status with ROHS3 compliance. It is not a direct replacement for 150mA applications.

Q: What does RoHS compliance mean for part selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. For new production and export to regulated markets, ROHS3-compliant parts (LP2985-28DBVR, LP2985IM5-2.8/NOPB, LD2985BM28R, LT1761ES5-2.8#TRMPBF) are required. The original LP2985IM5-2.8 is RoHS non-compliant.

Q: Can I use parts with different packaging formats interchangeably?

A: Electrical performance is identical across packaging formats (tape & reel, cut tape, tube). However, assembly equipment and procurement processes may require specific packaging. Verify packaging compatibility with your supply chain and manufacturing process before substitution.

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

A: The /NOPB suffix indicates the part is supplied without plumbum (lead-free). This designation confirms ROHS3 compliance and is standard for current production parts. Parts without this suffix may contain lead and are typically obsolete or legacy variants.

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