LP2985-28DBVT Equivalent & Substitute Parts

Part Overview

The LP2985-28DBVT is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) device. It delivers a fixed 2.8V output at 150mA in a surface-mount SOT-23-5 package. The device is currently marked as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing production support, design updates, and component sourcing.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.8V
Output Current	150mA
Input Voltage (Max)	16V
Voltage Dropout (Max)	0.58V @ 150mA
Quiescent Current	95 µA
PSRR	45dB (1kHz)
Operating Temperature Range	-40°C ~ 125°C
Package	SOT-23-5 (SC-74A)
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable

Substitute Part Grouping Explanation

Substitution eligibility for the LP2985-28DBVT is determined by strict equivalence across the following parameters:

Fixed output voltage of 2.8V
Output current rating of 150mA
Maximum input voltage of 16V
Voltage dropout specification of 0.58V @ 150mA
Quiescent current of 95 µA
PSRR of 45dB (1kHz)
Operating temperature range of -40°C ~ 125°C
SOT-23-5 package configuration
Enable control feature
Over Current, Over Temperature, and Short Circuit protection

Parts meeting all these criteria are classified as direct substitutes. Parts with minor parameter variations (such as quiescent current or dropout voltage within acceptable tolerances) are classified as parametric equivalents. All substitute parts maintain ROHS3 compliance and identical electrical functionality within the specified operating conditions.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout @ 150mA	Quiescent Current	PSRR	Package	Product Status	Inventory
LP2985-28DBVT	Texas Instruments	2.8V	150mA	0.58V	95 µA	45dB (1kHz)	SOT-23-5	Obsolete	3005 Pcs
LP2985-28DBVR	Texas Instruments	2.8V	150mA	0.58V	95 µA	45dB (1kHz)	SOT-23-5	Active	29300 Pcs
LP2985IM5X-2.8/NOPB	Texas Instruments	2.8V	150mA	0.58V	95 µA	45dB (1kHz)	SOT-23-5	Active	903 Pcs
LP2985A-28DBVR	Texas Instruments	2.8V	150mA	0.58V	95 µA	45dB (1kHz)	SOT-23-5	Last Time Buy	5560 Pcs
LP2985A-28DBVT	Texas Instruments	2.8V	150mA	0.58V	95 µA	45dB (1kHz)	SOT-23-5	Obsolete	6300 Pcs
LP2985AIM5-2.8	Texas Instruments	2.8V	150mA	0.58V	95 µA	45dB (1kHz)	SOT-23-5	Not For New Designs	4750 Pcs
LP2985AIM5X-2.8/NOPB	Texas Instruments	2.8V	150mA	0.58V	95 µA	45dB (1kHz)	SOT-23-5	Active	2200 Pcs
LP2985IM5-2.8/NOPB	Texas Instruments	2.8V	150mA	0.58V	95 µA	45dB (1kHz)	SOT-23-5	Active	3400 Pcs
LD2985BM28R	STMicroelectronics	2.8V	150mA	0.575V	150 µA	45dB (1kHz)	SOT-23-5	Active	5728 Pcs

Engineering Selection Recommendations

For applications requiring direct replacement of the LP2985-28DBVT, the following selection hierarchy is based on product status and compliance:

Primary Recommendation: LP2985-28DBVR (Texas Instruments, Active status, 29300 Pcs in stock). This part is electrically identical to the obsolete LP2985-28DBVT and maintains full ROHS3 compliance. The higher inventory level ensures supply continuity.

Secondary Recommendations: LP2985IM5-2.8/NOPB or LP2985AIM5X-2.8/NOPB (both Active status, ROHS3 compliant). These variants offer equivalent electrical performance with confirmed long-term availability.

Parametric Equivalent: LD2985BM28R (STMicroelectronics, Active status). This part exhibits minor parameter variations: quiescent current of 150 µA (versus 95 µA) and dropout voltage of 0.575V (versus 0.58V). These differences remain within acceptable tolerances for most applications while providing an alternative manufacturer source.

Avoid for New Designs: LP2985AIM5-2.8 (Not For New Designs status) and LP2985A-28DBVT (Obsolete status) should not be selected for new production designs despite electrical equivalence.

Frequently Asked Questions (FAQ)

Q: Can LP2985-28DBVR be used as a direct replacement for LP2985-28DBVT?

A: Yes. Both parts are electrically identical across all specified parameters: 2.8V fixed output, 150mA current rating, 0.58V dropout voltage, 95 µA quiescent current, and SOT-23-5 package. The primary difference is product status; LP2985-28DBVR is Active while LP2985-28DBVT is Obsolete.

Q: What is the difference between LP2985-28DBVR and LP2985IM5-2.8/NOPB?

A: Both parts are electrically equivalent with identical electrical specifications. The difference lies in packaging designation: LP2985-28DBVR uses the DBVR suffix while LP2985IM5-2.8/NOPB uses the IM5 suffix. Both are supplied in Tape & Reel format and are Active products.

Q: Is LD2985BM28R a suitable substitute?

A: LD2985BM28R is a parametric equivalent from STMicroelectronics. It maintains the same 2.8V output, 150mA current rating, and SOT-23-5 package. However, it has a quiescent current of 150 µA (versus 95 µA) and dropout voltage of 0.575V (versus 0.58V). These variations are minor and acceptable for most applications, but should be evaluated against specific power budget and thermal requirements.

Q: Why is LP2985AIM5-2.8 marked as "Not For New Designs"?

A: Parts with this status designation are in the end-of-life phase. While electrically equivalent to the LP2985-28DBVT, they should not be selected for new production designs due to limited future availability and potential supply discontinuation.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitute parts (LP2985-28DBVR, LP2985IM5X-2.8/NOPB, LP2985IM5-2.8/NOPB, and LD2985BM28R) are ROHS3 compliant. LP2985AIM5-2.8 is RoHS non-compliant and should not be used in applications requiring RoHS certification.

Q: Can I mix different part numbers in the same production batch?

A: All substitute parts maintain identical electrical specifications and SOT-23-5 package configuration, allowing interchangeability within the same circuit design. However, component traceability and supply chain documentation should reflect the specific part number used in each production lot.

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