LP3992IMF-1.5/NOPB Equivalent & Substitute Parts

Part Overview

The LP3992IMF-1.5/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.5V output at 30mA in a SOT-23-5 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device provides enable control and protection against over-temperature and short-circuit conditions across an operating range of -40°C to 125°C.

Substiute Parts

LP3992IMF-1.5/NOPB

Texas InstrumentsIn Stock: 864LP3992IMF-1.5/NOPB Datasheet

Current PartRFQ

LP3992IMFX-1.5/NOPB

Texas InstrumentsIn Stock: 2272LP3992IMFX-1.5/NOPB Datasheet

Parametric EquivalentRFQ

RT9020-18GB

Richtek USA Inc.In Stock: 3244RT9020-18GB Datasheet

MFR RecommendedRFQ

RT9193-15GB

Richtek USA Inc.In Stock: 103462RT9193-15GB Datasheet

MFR RecommendedRFQ

RT9193-16GB

Richtek USA Inc.In Stock: 23498RT9193-16GB Datasheet

MFR RecommendedRFQ

RT9193-18GB

Richtek USA Inc.In Stock: 105364RT9193-18GB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP3992IMF-1.5/NOPB is determined by the following critical parameters:

• Output voltage matching at 1.5V fixed output
• Output current capability of at least 30mA
• Input voltage maximum of 5.2V or greater
• SOT-23-5 package compatibility
• Enable control feature
• Surface mount configuration
• Operating temperature range of -40°C to 125°C or greater

The substitute parts are grouped into two categories:

Parametric Equivalent (Direct Replacement): LP3992IMFX-1.5/NOPB matches all electrical and mechanical specifications identically, with the primary difference being active product status and packaging format (Tape & Reel).

Functional Equivalents (Higher Performance): RT9193-15GB provides the same 1.5V output voltage with enhanced current capability (300mA vs. 30mA), improved PSRR performance, and active product status. RT9020-18GB and RT9193-18GB offer alternative output voltages (1.8V) with higher current ratings, suitable for applications where output voltage tolerance permits.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: LP3992IMFX-1.5/NOPB is the parametric equivalent with identical electrical specifications and package configuration. This part maintains active product status and ROHS3 compliance, making it suitable for immediate substitution in existing designs. Availability is higher (2200 pcs in stock vs. 836 pcs for the original part).

For New Designs with Higher Current Requirements: RT9193-15GB provides the same 1.5V output voltage with 10x higher current capability (300mA), improved PSRR performance (70dB ~ 50dB vs. 40dB ~ 30dB), and active product status. This part is recommended when design margins or future current scaling is anticipated. Operating temperature range matches the original specification (-40°C to 125°C). Inventory availability is significantly higher (103,400 pcs).

For Alternative Output Voltage Applications: RT9193-18GB and RT9020-18GB offer 1.8V output with enhanced current ratings. RT9193-18GB maintains the full -40°C to 125°C operating range, while RT9020-18GB operates to 85°C maximum. Both parts are ROHS3 compliant and carry active product status.

All substitute parts maintain SOT-23-5 package compatibility, surface mount configuration, and enable control features. Selection should be based on specific output voltage and current requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can LP3992IMFX-1.5/NOPB be used as a direct replacement for LP3992IMF-1.5/NOPB?

A: Yes. LP3992IMFX-1.5/NOPB is a parametric equivalent with identical output voltage (1.5V), output current (30mA), input voltage rating (5.2V max), quiescent current (50 µA), PSRR characteristics, operating temperature range (-40°C to 125°C), and SOT-23-5 package. The primary differences are active product status and packaging format (Tape & Reel vs. bulk). No circuit modifications are required.

Q: Why is RT9193-15GB listed as a substitute if it has higher output current (300mA vs. 30mA)?

A: RT9193-15GB matches the critical substitution parameters: fixed 1.5V output voltage, SOT-23-5 package, enable control, and -40°C to 125°C operating range. Higher output current capability does not prevent substitution; it provides design margin and future scalability. The part is pin-compatible and functionally superior in terms of current delivery and PSRR performance.

Q: Can RT9020-18GB or RT9193-18GB be used if my circuit requires exactly 1.5V output?

A: No. RT9020-18GB and RT9193-18GB provide fixed 1.8V output, not 1.5V. These parts are listed as functional alternatives only for applications where 1.8V output voltage is acceptable. Output voltage is a critical parameter that cannot be adjusted without external components.

Q: What is the difference between RT9193-15GB and RT9193-18GB?

A: Both parts are from the RT9193 series with identical current capability (300mA), PSRR performance (70dB ~ 50dB), quiescent current (130 µA), and operating temperature range (-40°C to 125°C). The difference is output voltage: RT9193-15GB provides 1.5V fixed output, while RT9193-18GB provides 1.8V fixed output. Selection depends on the required output voltage for your application.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. LP3992IMFX-1.5/NOPB, RT9193-15GB, RT9020-18GB, and RT9193-18GB are all ROHS3 compliant, matching the compliance status of the original LP3992IMF-1.5/NOPB.

Q: What is the operating temperature difference between RT9020-18GB and other substitutes?

A: RT9020-18GB operates from -40°C to 85°C maximum, while the original LP3992IMF-1.5/NOPB and most substitutes (LP3992IMFX-1.5/NOPB, RT9193-15GB, RT9193-18GB) operate from -40°C to 125°C. If your application requires operation above 85°C, RT9020-18GB is not suitable.

Q: Can I use these parts interchangeably in my PCB layout?

A: Yes. All substitute parts use the SOT-23-5 package (SC-74A, SOT-753), which provides identical pin configuration and footprint compatibility. No PCB layout modifications are required for substitution.