TI LM1117IMPX-1.8/NOPB

Mfr. Part

LM1117IMPX-1.8/NOPB

Manufacturer

Texas Instruments (TI). Y-IC is a trusted quality distributor for TI. We supply original products with fast service and reliable support.

Detailed Description

Fixed 1.8 V low-dropout (LDO) linear regulator rated up to 800 mA. SOT-223 surface-mount package, tape-and-reel “X” supply, RoHS/lead-free “NOPB”. Ideal point-of-load regulator for digital and analog rails. Category: Integrated Circuits (ICs); Subcategory: Specialized ICs (Linear Voltage Regulator).

Key Features

Fixed output voltage: 1.8 V

Output current: up to 800 mA (with adequate heat sinking/PCB copper)

Low dropout: about 1.1–1.2 V at 800 mA (typical)

Output accuracy: about ±1% at 25°C (varies across temp/load; see datasheet)

Built-in current limit and thermal shutdown

Stable with proper output capacitance (commonly 10 µF; check ESR guidance in datasheet)

Wide input range for 1.8 V regulation (ensure Vin ≥ Vout + dropout and within absolute max)

Quiet linear operation with good PSRR at low frequencies

Tab (back metal) tied to output for improved thermal performance

Operating junction temperature range typically -40°C to +125°C

Key Advantages

Simple, clean 1.8 V rail without switching noise

Drop-in use in many 1117 footprints; very common pinout for easy design-in

Robust protection (current limit + thermal shutdown) improves reliability

Compact SOT-223 footprint with good heat dissipation when mounted to copper

Cost-effective way to derive 1.8 V from 3.3 V or 5 V rails

Lead-free, RoHS-compliant “NOPB” finish supports modern manufacturing

Packaging

Type: SOT-223 (JEDEC TO-261AA), 4 terminals (3 leads + tab)

TI package info: SOT-223; ordering code suffix IMPX (tape-and-reel); internal package/case code reference: 585

Material/finish: Molded epoxy body, matte-tin plated leads, lead-free “NOPB”

Approximate body size: about 6.5 mm (L) × 3.5 mm (W) × 1.7–1.8 mm (H)

Pin configuration (front view, leads down):

Pin 1 = GND (for fixed version) / ADJ (for adjustable versions)

Pin 2 = OUTPUT (tab is internally connected to OUTPUT)

Pin 3 = INPUT

Tab = OUTPUT (use copper area for heat spreading)

Thermal characteristics (board-dependent; see datasheet for exact values):

Junction-to-case (RθJC) commonly ~15–20 °C/W

Junction-to-ambient (RθJA) varies widely with copper area; often ~50–100 °C/W on a good thermal pad/copper pour

Electrical properties (summary):

Vout: 1.8 V fixed

Iout: up to 0.8 A

Dropout: ~1.1–1.2 V at 0.8 A (typical)

Line/load regulation: tight; see datasheet for limits

Quiescent current: low (few mA typical, increases with load)

Protections: current limit and thermal shutdown

Supply format: Tape-and-reel (IMPX). Reel quantity depends on TI packing spec; contact us for exact reel count.

Lifecycle

Status: Active, widely used. Not nearing discontinuation as of the latest public information.

Equivalent/alternative models (verify pinout, dropout, and specs for your design):

• Texas Instruments TLV1117-18 (pin-compatible 1.8 V LDO in SOT-223, similar current rating)

• onsemi NCP1117ST18T3G (1117 family, SOT-223, 1.8 V)

• STMicroelectronics LD1117S18TR (1117 family, SOT-223, 1.8 V)

• Diodes Incorporated AP1117-18 (1117 family, SOT-223, 1.8 V)

• AMS/Various AMS1117-1.8 (1117 family, SOT-223, 1.8 V)

Note: Always confirm absolute maximum ratings, required output capacitor/ESR, dropout, accuracy, and pin assignment before substitution.

If you need functionally similar parts with different packages, output currents, or ultra-low dropout, contact our sales team via Y-IC’s website for tailored recommendations.

Key Application Areas

1.8 V digital core rails for MCUs, DSPs, FPGAs, ASICs, CPLDs

DDR/LPDDR and other memory I/O or core supplies (when 1.8 V is required)

Point-of-load regulation from 3.3 V or 5 V intermediate rails

Analog front-ends and mixed-signal circuits that prefer low-noise supplies

Consumer, industrial, networking, storage, and embedded systems

Post-regulation after a switching converter for noise-sensitive loads

Datasheet

Y-IC provides the most authoritative, up-to-date datasheet for LM1117IMPX-1.8/NOPB on our product page. We recommend downloading it here to get complete electrical, thermal, and application guidance.

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