LP3984ITPX-1.8/NOPB Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3984ITPX-1.8/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output at 150mA in a 4-DSBGA package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device provides regulated 1.8V output with integrated over-temperature and short-circuit protection, suitable for low-power applications requiring compact surface-mount solutions.

Substiute Parts

LP3984ITPX-1.8/NOPB

Texas InstrumentsIn Stock: 1094LP3984ITPX-1.8/NOPB Datasheet

Current PartRFQ

LP3990QTLX-1.8Q1

Texas InstrumentsIn Stock: 9458LP3990QTLX-1.8Q1 Datasheet

DirectRFQ

LP3990TLX-1.8/NOPB

Texas InstrumentsIn Stock: 1239LP3990TLX-1.8/NOPB Datasheet

MFR RecommendedRFQ

TPS72718YFFT

Texas InstrumentsIn Stock: 1473TPS72718YFFT Datasheet

MFR RecommendedRFQ

ADP162ACBZ-1.8-R7

Analog Devices Inc.In Stock: 2072ADP162ACBZ-1.8-R7 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP3984ITPX-1.8/NOPB is determined by the following critical parameters:

• Output voltage fixed at 1.8V
• Output current capability of 150mA or greater
• Input voltage maximum of 5.5V or higher
• 4-DSBGA or compatible package footprint
• Operating temperature range of -40°C to 125°C or wider
• Surface-mount technology
• Enable control feature
• Over-temperature and short-circuit protection

Substitute parts must maintain electrical compatibility across these parameters while offering active product status and current manufacturing availability. Package compatibility is evaluated based on pin count, pitch, and footprint dimensions within the DSBGA/WFBGA/WLCSP families.

Parameter Comparison

Engineering Selection Recommendations

LP3990QTLX-1.8Q1 is the primary direct substitute for the LP3984ITPX-1.8/NOPB. This part maintains identical electrical specifications including 1.8V output, 150mA current capability, and 4-DSBGA package footprint. The LP3990QTLX-1.8Q1 carries active product status and includes automotive-grade qualification (AEC-Q100), providing enhanced reliability for production environments. Quiescent current is reduced to 80 µA compared to the original 125 µA, offering improved power efficiency.

LP3990TLX-1.8/NOPB serves as an alternative Texas Instruments substitute with identical electrical performance and active status. This part operates within a narrower temperature range (-40°C to 85°C) compared to the original specification, requiring verification for applications requiring full -40°C to 125°C operation.

TPS72718YFFT provides increased output current capability at 250mA while maintaining 1.8V output and active product status. This part is suitable for applications requiring higher current delivery. Input voltage maximum is reduced to 5.5V, requiring verification against system power supply specifications. Enhanced protection features include over-current and under-voltage lockout (UVLO) in addition to over-temperature protection.

ADP162ACBZ-1.8-R7 from Analog Devices Inc. offers the lowest quiescent current at 1.25 µA, making it suitable for ultra-low-power applications. Package footprint differs as a 4-WLCSP (0.96x0.96) versus the original 4-DSBGA, requiring PCB layout redesign. Input voltage maximum is 5.5V. This part includes over-current and UVLO protection features.

All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can LP3990QTLX-1.8Q1 directly replace LP3984ITPX-1.8/NOPB without PCB modifications?

A: Yes. Both parts use the 4-DSBGA package with identical pin configuration and electrical specifications. No PCB layout changes are required for direct substitution.

Q: What is the primary advantage of LP3990QTLX-1.8Q1 over the original part?

A: The LP3990QTLX-1.8Q1 offers active product status with ongoing manufacturing support, reduced quiescent current (80 µA vs. 125 µA), and automotive-grade qualification (AEC-Q100) for enhanced reliability.

Q: Why does LP3990TLX-1.8/NOPB have a narrower operating temperature range?

A: The LP3990TLX-1.8/NOPB is specified for -40°C to 85°C operation. Applications requiring full -40°C to 125°C operation must verify this specification against system requirements before selection.

Q: Is TPS72718YFFT suitable for all applications using LP3984ITPX-1.8/NOPB?

A: TPS72718YFFT provides higher output current (250mA) and enhanced protection features, making it suitable for higher-current applications. However, input voltage maximum is reduced to 5.5V. Verify system power supply specifications before substitution.

Q: What are the package differences between ADP162ACBZ-1.8-R7 and the original part?

A: ADP162ACBZ-1.8-R7 uses a 4-WLCSP (0.96x0.96) package versus the original 4-DSBGA. This requires PCB footprint redesign and layout modifications. The WLCSP package offers a smaller form factor suitable for space-constrained applications.

Q: Does ADP162ACBZ-1.8-R7 require different PCB design considerations?

A: Yes. The 4-WLCSP package has different thermal and electrical characteristics compared to 4-DSBGA. Thermal management, via placement, and trace routing must be re-evaluated for the smaller package footprint.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and are suitable for applications requiring RoHS certification.

Q: What protection features distinguish TPS72718YFFT and ADP162ACBZ-1.8-R7 from the original part?

A: Both parts include over-current and under-voltage lockout (UVLO) protection in addition to over-temperature protection. The original LP3984ITPX-1.8/NOPB provides over-temperature and short-circuit protection only.