LP2985AIM5-2.8/NOPB Equivalent & Substitute Parts

Part Overview

The LP2985AIM5-2.8/NOPB is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) device. It delivers a fixed positive 2.8V output at 150mA with a maximum input voltage of 16V and dropout voltage of 0.58V at rated current. The device integrates over-current, over-temperature, and short-circuit protection with an enable control feature. Currently designated as Last Time Buy status, alternative equivalent parts are necessary for ongoing production and long-term design continuity.

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)
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitute parts are classified into three categories based on electrical and mechanical compatibility:

Parametric Equivalents (Direct Replacement): Parts sharing identical electrical specifications, output voltage, current rating, input voltage range, dropout voltage, quiescent current, PSRR, protection features, and SOT-23-5 packaging. These parts differ only in product status, packaging format (Tape & Reel vs. Cut Tape), or RoHS compliance status.

Direct Manufacturer Substitutes: Parts from the same manufacturer with identical output voltage and current ratings, SOT-23-5 packaging, and compatible control/protection features, but with different product status or packaging options.

Cross-Manufacturer Equivalent: Parts from alternative manufacturers meeting the same electrical specifications, output voltage, current rating, and package type, with comparable protection and control features.

Conditional Substitute (Higher Performance): Parts with enhanced specifications (higher current output, lower dropout voltage, improved PSRR) that function as drop-in replacements with superior performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Product Status	RoHS Status
LP2985AIM5-2.8/NOPB	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985A-28DBVR	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Last Time Buy	ROHS3 Compliant
LP2985-28DBVR	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985-28DBVT	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Obsolete	ROHS3 Compliant
LP2985A-28DBVT	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Obsolete	ROHS3 Compliant
LP2985AIM5-2.8	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Not For New Designs	RoHS non-compliant
LP2985AIM5X-2.8/NOPB	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5-2.8/NOPB	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LP2985IM5X-2.8/NOPB	Texas Instruments	2.8V	150mA	16V	0.58V @ 150mA	95 µA	SOT-23-5	Active	ROHS3 Compliant
LD2985BM28R	STMicroelectronics	2.8V	150mA	16V	0.575V @ 150mA	150 µA	SOT-23-5	Active	ROHS3 Compliant
TPS79328DBVR	Texas Instruments	2.8V	200mA	5.5V	0.2V @ 200mA	220 µA	SOT-23-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

LP2985AIM5X-2.8/NOPB and LP2985IM5-2.8/NOPB are the preferred alternatives. Both are Active status parts with ROHS3 compliance, identical electrical specifications to the main part, and SOT-23-5 packaging. These parts provide design continuity with current product lifecycle support.

Secondary Substitutes (Active Status, Tape & Reel Packaging):

LP2985-28DBVR is an Active status part with identical electrical specifications and Tape & Reel packaging. This part offers higher inventory availability (29,300 units) and ongoing manufacturer support, making it suitable for high-volume production requirements.

Cross-Manufacturer Alternative:

LD2985BM28R from STMicroelectronics is an Active status part with equivalent electrical performance. Dropout voltage is marginally lower (0.575V vs. 0.58V), and quiescent current is slightly higher (150 µA vs. 95 µA). This part is suitable when Texas Instruments supply is constrained, provided design validation confirms compatibility with the marginally different quiescent current specification.

Conditional Substitute (Enhanced Performance):

TPS79328DBVR is a higher-performance alternative with 200mA output current, lower dropout voltage (0.2V), and improved PSRR (70dB ~ 43dB). However, maximum input voltage is limited to 5.5V compared to 16V for the main part. This part is suitable only for applications with input voltage below 5.5V and where the higher current capability is beneficial.

Parts to Avoid:

LP2985AIM5-2.8 is RoHS non-compliant and designated Not For New Designs. Obsolete parts (LP2985-28DBVT, LP2985A-28DBVT) should not be used for new production due to discontinued manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can LP2985AIM5X-2.8/NOPB directly replace LP2985AIM5-2.8/NOPB?

A: Yes. Both parts have identical electrical specifications (2.8V output, 150mA current, 0.58V dropout voltage, 95 µA quiescent current), SOT-23-5 packaging, and equivalent protection/control features. The primary difference is product status; LP2985AIM5X-2.8/NOPB is Active while the original is Last Time Buy.

Q: What is the difference between LP2985-28DBVR and LP2985A-28DBVR?

A: Both parts are electrically identical with 2.8V output and 150mA current. The difference is packaging format: LP2985-28DBVR is supplied in Tape & Reel (TR) format with Active status, while LP2985A-28DBVR is Cut Tape (CT) format with Last Time Buy status. For production, LP2985-28DBVR is preferred due to Active status and higher inventory.

Q: Is LD2985BM28R a suitable replacement?

A: LD2985BM28R from STMicroelectronics meets the core electrical requirements (2.8V output, 150mA current, SOT-23-5 package). Quiescent current is 150 µA versus 95 µA for the original part. If the application's power budget accommodates the additional 55 µA quiescent current draw, this part is functionally compatible. Design validation is recommended before production implementation.

Q: Why is TPS79328DBVR listed as a conditional substitute?

A: TPS79328DBVR offers superior performance with 200mA output current and 0.2V dropout voltage. However, maximum input voltage is 5.5V, compared to 16V for LP2985AIM5-2.8/NOPB. This part is suitable only for applications with input voltage below 5.5V. If your design requires 16V input capability, TPS79328DBVR is not compatible.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitutes (LP2985AIM5X-2.8/NOPB, LP2985IM5-2.8/NOPB, LP2985-28DBVR, LD2985BM28R, TPS79328DBVR) are ROHS3 compliant. LP2985AIM5-2.8 is RoHS non-compliant and should not be used for new designs.

Q: What is the difference between SOT-23-5 and SC-74A packaging?

A: SOT-23-5 and SC-74A refer to the same physical package. SC-74A is the JEDEC designation, while SOT-23-5 is the industry standard name. All substitute parts use this identical package, ensuring mechanical and electrical compatibility.

Q: Can I use obsolete parts (LP2985-28DBVT, LP2985A-28DBVT) in new designs?

A: No. Obsolete parts have discontinued manufacturer support and are not recommended for new designs. Use Active status alternatives such as LP2985-28DBVR or LP2985AIM5X-2.8/NOPB instead.

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