onsemi NCP186BMX120TAG

Overview

NCP186BMX120TAG from onsemi is a 1 A CMOS low-dropout (LDO) regulator with fixed 1.2 V output, 1.8–5.5 V input range, 100 mV typical dropout at 1 A, ±1% output voltage accuracy, and no active output discharge function. It delivers fast transient response and low noise for powering precision analog and digital circuitry in space-constrained portable systems.

For engineers reviewing the NCP186BMX120TAG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout performance at 1 A load, thermal shutdown behavior at 165°C, compatibility with 1 µF ceramic output capacitors, and absence of output discharge-critical for systems requiring controlled power-down sequencing without residual voltage decay.

Technical Context

The NCP186BMX120TAG implements a PMOS pass transistor architecture enabling ultra-low quiescent current (90 µA typ.) and stable operation with minimal external capacitance. Its adaptive ground current design maintains efficiency across load conditions while supporting fast line/load transients via internal soft-start and optimized control loop dynamics.

Unlike the NCP186A variant, this B-version omits the internal output discharge transistor-eliminating automatic VOUT pull-down when disabled. The EN pin operates with 1.0 V high-threshold and 0.4 V low-threshold, and the FB/ADJ pin supports direct connection to OUT for fixed-output use or resistor-divider configuration for adjustable variants.

Key Specifications

Pinout & Package

XDFN8 package (1.2 mm × 1.6 mm, 0.4 mm pitch), thermally enhanced with exposed pad (EPAD) recommended to be connected to GND for optimal heat dissipation. Pin count: 8 terminals (including EPAD).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with XC6210B122MR-G and MIC5219-1.2YM5-TR, the NCP186BMX120TAG uniquely balances 1 A capability, 100 mV dropout, full thermal/overcurrent protection, and industry-standard XDFN8 footprint-making it the only option suitable for high-reliability, high-current portable applications requiring both precision and robustness.

Availability

NCP186BMX120TAG is available at Aetrix Electronics and suitable for wearable health monitors, industrial sensor nodes, smart camera modules, and portable medical diagnostic tools requiring stable component supply and long-term manufacturability.

Supply support for NCP186BMX120TAG 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, with leadership in power management, analog, and sensor technologies.

The NCP186 series was designed specifically for battery-powered portable equipment demanding ultra-low noise, fast transient response, and minimal board area-targeting cameras, image sensors, and compact IoT endpoints.

FAQ

What is the output voltage tolerance of the NCP186BMX120TAG over temperature and load?

The NCP186BMX120TAG guarantees ±1% output voltage accuracy across −40°C to +85°C at 0–1 A load, and ±2.0% over −40°C to +125°C for VOUT_NOM ≥ 1.2 V. This specification is confirmed in Table 4 of the official datasheet and applies directly to the NCP186BMX120TAG fixed 1.2 V variant.

Does the NCP186BMX120TAG include output discharge functionality?

No, the NCP186BMX120TAG does not include output discharge. The "B" suffix explicitly denotes the absence of the internal discharge transistor-unlike the "A" version (e.g., NCP186AMX120TAG). When EN is pulled low, the NCP186BMX120TAG simply disables the pass element; VOUT remains floating unless externally discharged.

What minimum output capacitance is required for stability with the NCP186BMX120TAG?

The NCP186BMX120TAG is stable with a minimum effective output capacitance of 0.8 µF, but 1 µF ceramic (X7R/X5R) is recommended for optimal transient response and PSRR. This value accounts for DC bias and temperature derating-critical when using small-case 0201 or 0402 capacitors in the NCP186BMX120TAG design.

Can the NCP186BMX120TAG operate from a 1.8 V input to deliver 1.2 V at 1 A?

Yes-the NCP186BMX120TAG supports input voltages as low as 1.8 V and delivers 1.2 V at 1 A with a typical dropout of 175 mV (per Table 4, VOUT_NOM = 1.2 V). At 1.8 V input, the device sustains regulation as long as VIN ≥ VOUT + VDO ≈ 1.375 V, making it viable for single-cell Li-ion or NiMH battery systems.

What is the thermal resistance (θJA) of the NCP186BMX120TAG in its XDFN8 package?

The NCP186BMX120TAG in XDFN8 package has a junction-to-ambient thermal resistance (θJA) of 111°C/W under JEDEC standard board conditions (Table 3). Actual θJA improves significantly with increased copper area and connection of the EPAD to GND-enabling >500 mW power dissipation at TA = 25°C with proper layout.