LM1086IS-3.3 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LM1086IS-3.3 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. It delivers 1.5A output current at a fixed 3.3V output with a maximum dropout voltage of 1.5V at full load. The device is housed in a TO-263 (DDPAK-3) surface mount package and includes integrated protection features for over-current, over-temperature, and short-circuit conditions.

The LM1086IS-3.3 carries a Last Time Buy product status, indicating that this specific part number is no longer in active production. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs or design revisions.

Substiute Parts

LM1086IS-3.3

Texas InstrumentsIn Stock: 2258LM1086IS-3.3 Datasheet

Current PartRFQ

LM1086IS-3.3/NOPB

Texas InstrumentsIn Stock: 15589LM1086IS-3.3/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM1086IS-3.3 is determined by strict equivalence across the following critical parameters:

• Output voltage: 3.3V fixed
• Output current capability: 1.5A minimum
• Input voltage rating: 27.5V maximum
• Dropout voltage: 1.5V @ 1.5A maximum
• Package type: TO-263 (DDPAK-3) surface mount
• Protection features: Over-current, over-temperature, and short-circuit protection
• Operating temperature range: -40°C to 125°C

Only parts meeting all of these specifications are classified as parametric equivalents. Variations in any of these parameters disqualify a part from direct substitution without circuit redesign.

Parameter Comparison

Engineering Selection Recommendations

The LM1086IS-3.3/NOPB is a direct parametric equivalent to the LM1086IS-3.3. Both parts are manufactured by Texas Instruments and share identical electrical specifications, performance characteristics, and package configuration.

The primary distinction between these parts is product status and regulatory compliance documentation. The LM1086IS-3.3 is designated Last Time Buy, while the LM1086IS-3.3/NOPB maintains Active status in the manufacturer's product portfolio. The NOPB suffix indicates the part is supplied without plumbum (lead-free), consistent with ROHS3 compliance requirements.

For new designs or production continuity, the LM1086IS-3.3/NOPB is the appropriate selection due to its active manufacturing status and ongoing availability. Both parts satisfy identical functional and compliance requirements for applications requiring a 3.3V, 1.5A linear regulator in TO-263 packaging.

Frequently Asked Questions (FAQ)

Q: Can the LM1086IS-3.3/NOPB be used as a direct replacement for the LM1086IS-3.3?

A: Yes. Both parts are parametrically identical across all electrical specifications, output characteristics, protection features, and package configuration. No circuit modifications are required for substitution.

Q: What does the NOPB suffix indicate?

A: NOPB designates the part as lead-free (no plumbum). This indicates compliance with ROHS3 environmental regulations. Both the original and NOPB versions are ROHS3 compliant.

Q: Are there any differences in thermal or reliability performance between these parts?

A: No. Both parts share identical thermal characteristics, quiescent current specifications, PSRR performance, and protection feature implementations. Operating temperature range and MSL ratings are equivalent.

Q: Why is the LM1086IS-3.3 marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing this specific part number. The LM1086IS-3.3/NOPB remains in active production and serves as the current equivalent offering.

Q: Are there any package or pinout differences?

A: No. Both parts use the TO-263 (DDPAK-3) package with identical pinout and mechanical dimensions. PCB layouts and thermal management designs require no modification.

Q: What compliance certifications apply to both parts?

A: Both parts are ROHS3 compliant and carry identical MSL ratings of 3 (168 Hours). REACH status differs between the parts but does not affect functional equivalence or substitution eligibility.