LM1086IS-1.8 Equivalent & Substitute Parts

Part Overview

The LM1086IS-1.8 is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output at 1.5A in a TO-263 (DDPAK-3) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The device provides regulated 1.8V output with integrated protection features including over-current, over-temperature, and short-circuit protection, suitable for applications requiring stable low-voltage power delivery.

Substiute Parts

LM1086IS-1.8

Texas InstrumentsIn Stock: 1971LM1086IS-1.8 Datasheet

Current PartRFQ

LM1086IS-1.8/NOPB

Texas InstrumentsIn Stock: 1176LM1086IS-1.8/NOPB Datasheet

DirectRFQ

LD1085D2M18R

STMicroelectronicsIn Stock: 10275LD1085D2M18R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM1086IS-1.8 is determined by the following critical parameters:

• Fixed output voltage of 1.8V
• Surface mount TO-263 (DDPAK-3) package compatibility
• Output current capability of 1.5A or greater
• Maximum input voltage rating of 27V or higher
• Operating temperature range of -40°C to 125°C
• Integrated protection features (over-current, over-temperature, short-circuit)
• PSRR performance of 72dB at 120Hz

Two substitute parts meet these criteria: LM1086IS-1.8/NOPB (direct equivalent from Texas Instruments) and LD1085D2M18R (manufacturer-recommended substitute from STMicroelectronics with enhanced current capability).

Parameter Comparison

Engineering Selection Recommendations

LM1086IS-1.8/NOPB is the direct equivalent substitute, offering identical electrical specifications and the same TO-263 (DDPAK-3) package footprint. This part is active in production and ROHS3 compliant, making it the primary choice for direct replacement in existing designs.

LD1085D2M18R from STMicroelectronics is the manufacturer-recommended alternative, providing enhanced output current capability (3A versus 1.5A) and higher maximum input voltage (30V versus 27V). The D2PAK-3 package is mechanically and electrically compatible with TO-263 (DDPAK-3) footprints. This part carries MSL-1 rating (unlimited moisture sensitivity) compared to MSL-3 for the LM1086 variants, and is ROHS3 compliant. The LD1085D2M18R is suitable for applications requiring higher current delivery or improved thermal performance.

Frequently Asked Questions (FAQ)

Q: Can LM1086IS-1.8/NOPB be used as a direct replacement for LM1086IS-1.8?

A: Yes. LM1086IS-1.8/NOPB is the active production equivalent with identical electrical specifications, output voltage, current rating, and package type. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant).

Q: What is the difference between LM1086IS-1.8 and LM1086IS-1.8/NOPB?

A: Both parts share identical electrical characteristics and packaging. The /NOPB designation indicates lead-free (no-lead) plating and ROHS3 compliance. LM1086IS-1.8/NOPB is the current production version.

Q: Is LD1085D2M18R compatible with LM1086IS-1.8 footprints?

A: Yes. The D2PAK-3 package used by LD1085D2M18R is mechanically and electrically compatible with TO-263 (DDPAK-3) footprints. Pin configuration and lead spacing are equivalent.

Q: What are the advantages of LD1085D2M18R over LM1086IS-1.8/NOPB?

A: LD1085D2M18R provides double the output current (3A versus 1.5A), higher maximum input voltage (30V versus 27V), and superior moisture sensitivity rating (MSL-1 unlimited versus MSL-3 168 hours). These characteristics benefit applications with higher current demands or extended storage requirements.

Q: Are all three parts ROHS compliant?

A: LM1086IS-1.8 is RoHS non-compliant. Both LM1086IS-1.8/NOPB and LD1085D2M18R are ROHS3 compliant.

Q: What is the MSL rating and why does it matter?

A: MSL (Moisture Sensitivity Level) indicates how long a component can be stored in standard conditions before requiring baking. LM1086IS-1.8 and LM1086IS-1.8/NOPB have MSL-3 (168 hours). LD1085D2M18R has MSL-1 (unlimited storage). Higher MSL ratings provide greater flexibility in supply chain and storage management.