LP3986TL-2929/NOPB Equivalent & Substitute Parts

Part Overview

The LP3986TL-2929/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. This dual-output regulator delivers 150mA per channel at 2.9V with a maximum dropout voltage of 0.1V. The device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part is housed in an 8-DSBGA package and includes integrated protection features for over-current, over-temperature, and short-circuit conditions.

Substiute Parts

LP3986TL-2929/NOPB

Texas InstrumentsIn Stock: 4208LP3986TL-2929/NOPB Datasheet

Current PartRFQ

MIC5310-OOYML-TR

Microchip TechnologyIn Stock: 1128MIC5310-OOYML-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP3986TL-2929/NOPB is determined by the following critical parameters:

• Dual-output configuration with positive fixed voltage regulation
• Fixed output voltage of 2.9V on both channels
• Minimum output current capability of 150mA per channel
• Maximum dropout voltage not exceeding 0.1V at rated current
• Surface mount packaging suitable for automated assembly
• Operating temperature range of -40°C to 125°C
• Enable control feature and integrated protection (over-current, over-temperature, short-circuit)
• RoHS3 compliance and MSL Level 1 rating

The MIC5310-OOYML-TR from Microchip Technology meets these substitution criteria while offering active product status and improved electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The MIC5310-OOYML-TR is a qualified substitute for the obsolete LP3986TL-2929/NOPB based on functional equivalence and regulatory compliance. Both devices maintain identical output voltage specifications (2.9V), current ratings (150mA per channel), and dropout voltage performance (0.1V @ 150mA). Both parts are ROHS3 compliant with MSL Level 1 ratings, ensuring compatibility with standard manufacturing and storage protocols.

The MIC5310-OOYML-TR offers active product status, ensuring long-term availability and supply chain continuity. The substitute demonstrates improved quiescent current performance (120 µA versus 130 µA) and superior power supply rejection ratio (70dB ~ 65dB across 1kHz ~ 20kHz versus 60dB ~ 50dB across 1kHz ~ 10kHz). The maximum input voltage specification of 5.5V on the substitute is lower than the main part's 6V rating; circuit designs must confirm input voltage compliance within this constraint.

Package geometry differs between the two devices: the main part uses 8-DSBGA (1.56x1.56) while the substitute uses 8-MLF® (2x2). PCB layout modifications are required to accommodate the different package footprints.

Frequently Asked Questions (FAQ)

Q: Can the MIC5310-OOYML-TR directly replace the LP3986TL-2929/NOPB without circuit modifications?

A: Functional substitution is possible when input voltage remains below 5.5V. The substitute maintains identical output voltage (2.9V) and current ratings (150mA per channel). However, PCB layout changes are mandatory due to different package geometries (8-DSBGA versus 8-MLF®). Verify that your circuit input voltage does not exceed 5.5V, as the substitute has a lower maximum input specification than the original part.

Q: What are the key electrical differences between these two regulators?

A: Both devices deliver identical output specifications and dropout performance. The MIC5310-OOYML-TR provides lower quiescent current (120 µA versus 130 µA) and higher power supply rejection ratio (70dB ~ 65dB at 1kHz ~ 20kHz versus 60dB ~ 50dB at 1kHz ~ 10kHz). The main part includes short-circuit protection; the substitute includes over-current and over-temperature protection.

Q: Are there packaging considerations for this substitution?

A: Yes. The LP3986TL-2929/NOPB uses an 8-DSBGA package (1.56x1.56mm), while the MIC5310-OOYML-TR uses an 8-MLF® package (2x2mm). Different footprints, solder pad layouts, and thermal characteristics require complete PCB redesign. Consult the respective datasheets for detailed package dimensions and thermal management requirements.

Q: Do both parts meet the same compliance and environmental standards?

A: Both devices are ROHS3 compliant and carry MSL Level 1 ratings. Both operate across the -40°C to 125°C temperature range. Both are classified as EAR99 for export control purposes and are REACH unaffected. Compliance documentation is equivalent for standard manufacturing and supply chain applications.

Q: What is the inventory status for these parts?

A: The LP3986TL-2929/NOPB is obsolete with 4100 pieces available as new original stock. The MIC5310-OOYML-TR is an active product with 1051 pieces available as new original stock in tape and reel packaging.