LP2985ITPX-3.3/NOPB Equivalent & Substitute Parts

Part Overview

The LP2985ITPX-3.3/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output at 150mA capacity. This device is classified as obsolete, which necessitates identification of active equivalent parts for new designs and ongoing production requirements. The part operates across industrial temperature ranges (-40°C to 125°C) and includes integrated protection features for over-current, over-temperature, and short-circuit conditions.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	150mA
Input Voltage (Max)	16V
Voltage Dropout (Max)	0.58V @ 150mA
Quiescent Current	95 µA
Operating Temperature Range	-40°C to 125°C
PSRR	45dB (1kHz)
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LP2985ITPX-3.3/NOPB is determined by the following critical parameters:

Fixed output voltage of 3.3V
Output current capability of 150mA
Maximum input voltage of 16V
Voltage dropout specification of 0.58V or lower at 150mA
Quiescent current of 95 µA or lower
Operating temperature range of -40°C to 125°C
Enable control feature
Over-current and over-temperature protection
ROHS3 compliance
MSL rating of 1 (Unlimited)

The identified substitute parts meet these electrical specifications and maintain functional equivalence. Package differences (5-DSBGA versus SOT-23-5) represent the primary physical distinction between the main part and substitutes.

Parameter Comparison

Parameter	LP2985ITPX-3.3/NOPB	LP2985AIM5X-3.3/NOPB	LD2985BM33R
Manufacturer	Texas Instruments	Texas Instruments	STMicroelectronics
Product Status	Obsolete	Active	Active
Output Voltage	3.3V	3.3V	3.3V
Output Current	150mA	150mA	150mA
Input Voltage (Max)	16V	16V	16V
Voltage Dropout (Max)	0.58V @ 150mA	0.58V @ 150mA	0.575V @ 150mA
Quiescent Current	95 µA	95 µA	150 µA
Supply Current (Max)	2.5 mA	2.5 mA	4 mA
PSRR	45dB (1kHz)	45dB (1kHz)	45dB (1kHz)
Control Features	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package / Case	5-UFBGA, DSBGA	SC-74A, SOT-753	SC-74A, SOT-753
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

LP2985AIM5X-3.3/NOPB is the manufacturer-recommended substitute from Texas Instruments. This part maintains identical electrical specifications to the obsolete LP2985ITPX-3.3/NOPB, including quiescent current, dropout voltage, and protection features. The primary difference is the package format (SOT-23-5 versus 5-DSBGA). This part carries active product status and is available in high inventory quantities (53,200 units). ROHS3 compliance and MSL-1 rating are maintained.

LD2985BM33R from STMicroelectronics provides functional equivalence with minor parameter variations. Quiescent current is specified at 150 µA (versus 95 µA for the main part), and maximum supply current is 4 mA (versus 2.5 mA). Voltage dropout is marginally superior at 0.575V. Short-circuit protection is not listed in the provided specifications. This part is active and available in substantial inventory (38,100 units). ROHS3 compliance and MSL-1 rating are maintained.

Selection between these substitutes depends on package compatibility with the target PCB design and the specific application requirements regarding quiescent current and supply current performance.

Frequently Asked Questions (FAQ)

Q: Why is the LP2985ITPX-3.3/NOPB obsolete? A: The LP2985ITPX-3.3/NOPB has reached end-of-life status. Texas Instruments recommends transitioning to the LP2985AIM5X-3.3/NOPB, which provides identical electrical performance in an alternative package format.

Q: What is the primary difference between LP2985ITPX-3.3/NOPB and LP2985AIM5X-3.3/NOPB? A: Both parts are from Texas Instruments with identical electrical specifications. The main difference is the package: LP2985ITPX uses 5-DSBGA, while LP2985AIM5X uses SOT-23-5. Electrical performance, output voltage, current rating, and protection features are equivalent.

Q: Can LD2985BM33R replace LP2985ITPX-3.3/NOPB? A: LD2985BM33R from STMicroelectronics meets the core electrical requirements (3.3V output, 150mA current, 16V input maximum, -40°C to 125°C operation). However, quiescent current is higher (150 µA versus 95 µA), and supply current maximum is higher (4 mA versus 2.5 mA). Short-circuit protection is not specified. Compatibility depends on application power budget constraints.

Q: Are package differences significant for substitution? A: Yes. The LP2985ITPX uses 5-DSBGA (ball grid array), while both substitutes use SOT-23-5 (small outline transistor). PCB layout, footprint, and assembly process compatibility must be verified before substitution.

Q: Do all three parts meet compliance requirements? A: All three parts are ROHS3 compliant and carry MSL-1 (Unlimited) moisture sensitivity ratings. REACH status is unaffected for all parts.

Q: What inventory status should influence part selection? A: LP2985AIM5X-3.3/NOPB has 53,200 units in stock, while LD2985BM33R has 38,100 units. Both represent substantial availability for production requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message