LP3981IMM-3.0 Equivalent & Substitute Parts

Part Overview

The LP3981IMM-3.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3V output applications with 300mA current capacity in an 8-VSSOP surface mount package. This device is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support, maintenance, and production continuity. The regulator integrates over-current, over-temperature, and short-circuit protection with an enable control feature, suitable for low-power applications requiring stable 3V regulation from input sources up to 6V.

Substiute Parts

LP3981IMM-3.0

Texas InstrumentsIn Stock: 1610LP3981IMM-3.0 Datasheet

Current PartRFQ

LP3981IMM-3.0/NOPB

Texas InstrumentsIn Stock: 2834LP3981IMM-3.0/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP3981IMM-3.0 is determined by strict equivalence across the following critical parameters:

• Fixed output voltage of 3V
• Output current capacity of 300mA minimum
• Maximum input voltage rating of 6V or higher
• Voltage dropout specification of 0.2V @ 300mA or lower
• Quiescent current of 120 µA
• PSRR performance of 50dB ~ 55dB (1kHz ~ 10kHz)
• Operating temperature range of -40°C ~ 125°C
• Surface mount package compatibility: 8-VSSOP or equivalent footprint
• Integrated protection: Over-current, over-temperature, short-circuit
• Enable control feature availability

The LP3981IMM-3.0/NOPB qualifies as a parametric equivalent substitute, maintaining identical electrical specifications and package footprint while differing in product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The LP3981IMM-3.0/NOPB is the direct parametric equivalent for the obsolete LP3981IMM-3.0. Selection between these parts should be based on the following criteria:

For new designs and production: The LP3981IMM-3.0/NOPB is the preferred choice. It maintains identical electrical performance and package compatibility while offering active product status, ensuring long-term availability and supply chain stability. The ROHS3 compliance status aligns with current regulatory requirements for electronic components in most markets.

For legacy system maintenance: The LP3981IMM-3.0 remains functionally equivalent if existing inventory is available. However, the obsolete status indicates limited future availability. Transition planning to the LP3981IMM-3.0/NOPB is recommended for sustained production support.

Packaging consideration: The LP3981IMM-3.0/NOPB is supplied in Tape & Reel format, standard for automated assembly processes. Bulk packaging of the original part may require reeling services for high-volume production environments.

Frequently Asked Questions (FAQ)

Q: Can the LP3981IMM-3.0/NOPB directly replace the LP3981IMM-3.0 in existing designs?

A: Yes. Both parts share identical electrical specifications, output voltage, current capacity, dropout voltage, quiescent current, PSRR performance, operating temperature range, and 8-VSSOP package footprint. No circuit modifications are required for substitution.

Q: What is the significance of the "/NOPB" suffix?

A: The "/NOPB" designation indicates the part is supplied without plumbum (lead-free), reflecting ROHS3 compliance. The base electrical functionality remains unchanged from the original part number.

Q: Why is the original LP3981IMM-3.0 marked as obsolete?

A: Obsolete status indicates Texas Instruments has discontinued active production and support for this specific part number variant. The LP3981IMM-3.0/NOPB represents the current production equivalent with updated compliance certifications.

Q: Are there packaging differences between these parts?

A: Yes. The LP3981IMM-3.0 is supplied in bulk packaging, while the LP3981IMM-3.0/NOPB is supplied in Tape & Reel format. Both use the same 8-VSSOP surface mount package with identical footprint and pinout. Tape & Reel packaging is standard for automated assembly and reduces handling costs in production environments.

Q: What protection features are included in both parts?

A: Both the LP3981IMM-3.0 and LP3981IMM-3.0/NOPB integrate over-current protection, over-temperature protection, and short-circuit protection. An enable control feature allows external circuit control of regulator operation.

Q: Is the RoHS compliance difference significant for component selection?

A: The LP3981IMM-3.0/NOPB's ROHS3 compliance status is relevant for applications subject to EU RoHS regulations or customer specifications requiring lead-free components. The LP3981IMM-3.0's non-compliant status may restrict use in regulated markets or with compliance-conscious customers.