Texas Instruments LM1117MP-1.8/NOPB

Overview

LM1117MP-1.8/NOPB from Texas Instruments is a fixed-output, 1.8 V, 800 mA low-dropout linear regulator in SOT-223 package, featuring ±1% output voltage accuracy, 1.2 V dropout at 800 mA, and integrated thermal shutdown and current limiting - used for powering FPGA I/O banks, microcontroller cores, and industrial sensor interfaces.

For engineers reviewing the LM1117MP-1.8/NOPB datasheet, LM1117MP-1.8/NOPB pinout, LM1117MP-1.8/NOPB application, or LM1117MP-1.8/NOPB equivalent, this page delivers verified electrical specs, validated SOT-223 pin mapping, confirmed thermal performance (R_θJA = 61.6°C/W), real-world load/line regulation data (0.4%/0.2% max), and two documented alternative parts with functional and packaging distinctions.

Technical Context

The LM1117MP-1.8/NOPB uses a Zener-trimmed bandgap reference to maintain ±1% output accuracy across 0°C to +125°C. Its internal PNP pass transistor enables low dropout operation without requiring external compensation components.

It operates with a minimum 10 µF tantalum output capacitor for stability and transient response, supports input voltages up to 15 V, and delivers regulated 1.8 V output with quiescent current ≤10 mA over temperature - making it suitable for post-regulation after DC/DC converters where ripple rejection and simplicity are critical.

Key Specifications

Pinout & Package

SOT-223 (DCY) package: 4-pin thermally enhanced plastic surface-mount package with exposed thermal pad (pin 4 = tab/VOUT). Body size 6.50 mm × 3.50 mm. Pin 1 = ADJ/GND (ground for fixed-output variants), Pin 2 = VOUT, Pin 3 = VIN, Pin 4 = VOUT (tab).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout linear regulator applications.

Compared with TLV76118 and TLV1117-18, the LM1117MP-1.8/NOPB provides guaranteed 800 mA output current across full industrial temperature range and tighter line/load regulation - making it preferred for mission-critical embedded systems where thermal robustness and parametric consistency outweigh ultra-low IQ needs.

Availability

LM1117MP-1.8/NOPB is available at Aetrix Electronics and suitable for industrial sensor interfaces, FPGA power delivery, and ultrasound front-end biasing requiring stable component supply, long-term lifecycle continuity, and traceable sourcing.

Supply support for LM1117MP-1.8/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and power management solutions for industrial, automotive, and communications markets.

The LM1117 product line was engineered for cost-sensitive, thermally constrained linear regulation tasks - delivering high accuracy and built-in protection in compact packages for use in DC/DC post-regulation, microprocessor supplies, and analog subsystems.

FAQ

What is the minimum input voltage required for stable operation of the LM1117MP-1.8/NOPB?

The LM1117MP-1.8/NOPB requires a minimum input voltage of 3.2 V to maintain regulation at full 800 mA load, based on its 1.2 V maximum dropout voltage specification. At lighter loads, input can be reduced - e.g., 3.0 V suffices at 500 mA - but design margin should include worst-case dropout (1.3 V) and input ripple to avoid dropout-induced output sag. The LM1117MP-1.8/NOPB datasheet specifies 3.2 V as the absolute minimum for guaranteed 1.8 V output across temperature and load.

Does the LM1117MP-1.8/NOPB require an external capacitor on the ADJ pin?

No - the LM1117MP-1.8/NOPB is a fixed-output variant, so the ADJ pin is internally connected to ground and does not accept external components. Unlike the adjustable LM1117-ADJ, this part has no ADJ terminal function; pin 1 serves solely as GND. Therefore, no capacitor is needed or permitted on that pin. The LM1117MP-1.8/NOPB only requires a minimum 10 µF tantalum capacitor on the output (VOUT) for stability and transient response.

Can the LM1117MP-1.8/NOPB be used in parallel to increase current capacity?

No - the LM1117MP-1.8/NOPB is not designed for parallel operation. Its output voltage tolerance (±1%) and load regulation (0.4% max) create imbalance risks: even minor mismatches cause one device to supply most of the current, leading to thermal runaway and premature failure. TI explicitly advises against paralleling LM1117 devices. For >800 mA, select a higher-current LDO (e.g., TPS7A83A) or switcher-based solution instead of attempting to parallel the LM1117MP-1.8/NOPB.

What thermal considerations apply to the LM1117MP-1.8/NOPB in SOT-223 package?

The LM1117MP-1.8/NOPB in SOT-223 has R_θJA = 61.6°C/W (JEDEC standard PCB). At 800 mA with 3.2 V input (1.4 V drop), power dissipation is ~1.12 W - raising junction temperature by ~69°C above ambient. With 25°C ambient, TJ ≈ 94°C, well within the 125°C limit. However, continuous operation near thermal shutdown requires ≥1 in² copper pour under the tab and minimal trace resistance. The LM1117MP-1.8/NOPB thermal shutdown activates at 150°C, providing fail-safe protection if heatsinking is inadequate.

Is the LM1117MP-1.8/NOPB RoHS-compliant and lead-free?

Yes - the /NOPB suffix explicitly denotes "No Lead (Pb)-Free" per JEDEC J-STD-609, confirming RoHS compliance and lead-free termination. The LM1117MP-1.8/NOPB uses matte-tin plating on all leads and meets IPC/JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) requirements. It is qualified for reflow soldering per JEDEC J-STD-020 profile and carries full TI environmental compliance documentation including REACH and conflict minerals statements.