LP2985ITP-3.3/NOPB Equivalent & Substitute Parts

Part Overview

The LP2985ITP-3.3/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output at 150mA. This component is classified as obsolete, which necessitates identification of active alternative parts for new designs and ongoing production requirements. The part operates across -40°C to 125°C and includes integrated protection features for over-current, over-temperature, and short-circuit conditions.

Substiute Parts

LP2985ITP-3.3/NOPB

Texas InstrumentsIn Stock: 1115LP2985ITP-3.3/NOPB Datasheet

Current PartRFQ

LP2985AIM5X-3.3/NOPB

Texas InstrumentsIn Stock: 53228LP2985AIM5X-3.3/NOPB Datasheet

MFR RecommendedRFQ

LD2985BM33R

STMicroelectronicsIn Stock: 38122LD2985BM33R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP2985ITP-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
• PSRR of 45dB at 1kHz or higher
• Operating temperature range of -40°C to 125°C
• Enable control feature
• Over-current and over-temperature protection

The LP2985ITP-3.3/NOPB uses a 5-DSBGA package. Substitute parts must maintain electrical equivalence across all specified parameters while accommodating package variations appropriate for surface-mount assembly.

Parameter Comparison

Engineering Selection Recommendations

LP2985AIM5X-3.3/NOPB is the manufacturer-recommended substitute from Texas Instruments. This part maintains identical electrical specifications to the LP2985ITP-3.3/NOPB while offering active product status and improved supply availability. The transition from 5-DSBGA to SOT-23-5 packaging requires PCB layout modification but provides superior long-term supply chain stability. Both parts carry ROHS3 compliance and MSL-1 ratings.

LD2985BM33R from STMicroelectronics provides an alternative from a different manufacturer. This part meets all critical electrical parameters with marginally improved dropout voltage (0.575V vs 0.58V). The quiescent current specification of 150 µA exceeds the original 95 µA, and maximum supply current increases to 4 mA. Short-circuit protection is not explicitly listed. This part is suitable for applications where manufacturer diversity is required and the increased quiescent current is acceptable.

Frequently Asked Questions (FAQ)

Q: Can LP2985AIM5X-3.3/NOPB directly replace LP2985ITP-3.3/NOPB without PCB modification?

A: No. The LP2985AIM5X-3.3/NOPB uses SOT-23-5 packaging while the original uses 5-DSBGA. PCB footprint and layout must be redesigned. However, electrical performance is identical.

Q: What is the primary reason for substituting the LP2985ITP-3.3/NOPB?

A: The LP2985ITP-3.3/NOPB is classified as obsolete. Active alternatives ensure continued component availability for production and future designs.

Q: Are there electrical differences between LP2985AIM5X-3.3/NOPB and LD2985BM33R?

A: Both parts deliver 3.3V at 150mA with identical PSRR and dropout voltage specifications. The LD2985BM33R has higher quiescent current (150 µA vs 95 µA) and maximum supply current (4 mA vs 2.5 mA). The LD2985BM33R does not list short-circuit protection.

Q: Which substitute should be selected for new designs?

A: LP2985AIM5X-3.3/NOPB is recommended for new designs. It maintains complete electrical equivalence, offers active status, and provides superior supply availability from the original manufacturer.

Q: Is the LD2985BM33R suitable for power-sensitive applications?

A: The LD2985BM33R exhibits higher quiescent current consumption. Applications requiring minimal standby power draw should prioritize LP2985AIM5X-3.3/NOPB.