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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

onsemi NCP186BMX350TAG

Name: NCP186BMX350TAG
Brand: onsemi
SKU: NCP186BMX350TAG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCP186BMX350TAG

Manufacturer:: onsemi

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 8-XFDFN Exposed Pad

Datasheet:: NCP186BMX350TAG.pdf

Description:: IC REG LINEAR 3.5V 1A 8XDFN

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Product details

Overview

NCP186BMX350TAG from onsemi is a 1 A CMOS low-dropout (LDO) regulator with fixed 3.5 V output, 1.8–5.5 V input range, and 100 mV typical dropout at 1 A (V_OUT = 3.5 V). It features ±1% output voltage accuracy, 90 µA typical quiescent current, thermal shutdown at 165°C, and stable operation with 1 µF ceramic output capacitors - optimized for powering noise-sensitive analog circuitry in portable image sensors and battery-powered cameras.

For engineers reviewing the NCP186BMX350TAG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout performance at 3.5 V output, absence of active output discharge (B-version), XDFN8 1.2×1.6 mm package thermal resistance (111 °C/W), and compatibility with low-ESR ceramic capacitors for fast load transient response in space-constrained designs.

Technical Context

The NCP186BMX350TAG implements a PMOS pass transistor architecture enabling ultra-low dropout and reverse-current blocking. Its adaptive ground current design maintains 90 µA quiescent current at no load while supporting full 1 A output with internal current limiting (1.4 A typ.) and thermal shutdown hysteresis of 20°C.

Unlike the A-version, this B-variant omits the output discharge transistor, eliminating automatic V_OUT pull-down during disable - critical for systems requiring hold-up voltage retention or avoiding unintended discharge paths in multi-rail sequencing.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.5 V ±1% over −40°C to +125°C - ensures stable bias for ADC references or image sensor analog front-ends without external feedback components.
Dropout Voltage	92–135 mV at 1 A (typ./max), V_OUT = 3.5 V - enables regulation from 3.62 V input, preserving battery runtime in single-cell Li-ion or 4xAA applications.
Quiescent Current	90 µA typ. at no load - minimizes standby power loss in always-on camera modules or IoT edge sensors.
PSRR	75 dB at 1 kHz - suppresses switching noise from adjacent DC/DC converters feeding digital cores, protecting sensitive analog signal chains.
Thermal Shutdown	165°C activation with 20°C hysteresis - provides robust overtemperature protection during sustained 1 A loads on minimal PCB copper area.
Stability	Guaranteed with ≥0.8 µF ceramic C_OUT (X7R/X5R) - eliminates need for tantalum or electrolytic capacitors, reducing board area and improving reliability.
Enable Threshold	V_ENH = 1.0 V min., V_ENL = 0.4 V max. - compatible with 1.8 V GPIOs and supports direct tie-to-V_IN for always-on operation.

Pinout & Package

XDFN8 1.2 mm × 1.6 mm, 0.4 mm pitch, exposed pad (EPAD) - thermally enhanced for 111 °C/W junction-to-air dissipation; EPAD recommended to be connected to GND plane for optimal thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
1, 2	OUT	LDO regulated output; connects directly to load; requires local 1 µF ceramic capacitor to GND for stability and transient response.
3	N/C	No internal connection; may be tied to GND plane to improve thermal dissipation without electrical impact.
4	FB/ADJ	Feedback input - internally tied to 3.5 V reference; left unconnected (not used) in fixed-output configuration.
5	GND	Power ground return path; must be low-impedance connection to system ground plane for noise immunity and thermal conduction.
6	EN	Active-high enable - drives internal pass transistor; <0.4 V disables regulator and reduces IN current to 0.1 µA typ.
7, 8	IN	Input supply pin - accepts 1.8–5.5 V; requires local 1 µF ceramic capacitor to GND near pin for EMI filtering and transient suppression.
EPAD	Thermal Pad	Exposed copper pad beneath package - soldering to large GND copper area reduces θ_JA and improves power handling capability.

Key Features

Feature	Design Value
Fast transient response	Sub-10 µs recovery from 1 mA ↔ 1 A load steps - maintains voltage regulation during burst-mode sensor readouts or processor wake events.
Low-noise operation	48 µV_RMS integrated noise (10 Hz–100 kHz) - preserves SNR in high-resolution image sensor analog signal paths.
Soft-start circuit	Internally controlled ramp limits inrush current during EN assertion - prevents input rail sag and avoids false triggering of upstream power monitors.
Overcurrent protection	1.4 A current limit (typ.) with foldback behavior - protects against short-circuit faults without latch-up, enabling safe auto-recovery.
Pb-free, RoHS-compliant	Halogen-free/BFR-free construction in XDFN8 package - meets environmental compliance requirements for consumer and industrial end equipment.

Applications

Image Sensor Power Supply	Portable Camera Module
Use Scenario: Providing clean, stable 3.5 V bias to CMOS image sensor analog front-end (AFE) and PLL clock circuitry in smartphone rear cameras. IC Role / Device Role / Timing Role: Primary LDO regulator delivering low-noise, low-dropout power to noise-sensitive analog blocks; replaces discrete regulators in compact module designs. Use Value: 48 µV_RMS noise and 75 dB PSRR prevent corruption of pixel-level analog signals, enabling >12-bit effective resolution under dynamic lighting conditions.	Use Scenario: Powering dual-rail camera subsystems (3.5 V AFE + 1.2 V digital core) where sequencing and voltage retention are critical during sleep/wake transitions. IC Role / Device Role / Timing Role: Fixed-output LDO supplying analog domain; paired with separate digital LDO; EN pin synchronized to application processor's power management unit. Use Value: Absence of active discharge (B-version) prevents unintended V_OUT collapse during brief EN glitches, ensuring reliable frame capture after wake-up.
Battery-Powered Medical Imaging	Industrial Handheld Scanner
Use Scenario: Regulating power for portable ultrasound probe analog beamforming ICs operating from single-cell Li-ion (3.0–4.2 V). IC Role / Device Role / Timing Role: High-accuracy, low-drift LDO maintaining 3.5 V ±1% across temperature and load - critical for gain-stable analog signal conditioning. Use Value: 100 mV dropout at 1 A allows >95% battery utilization down to 3.6 V, extending clinical scan time per charge without compromising signal fidelity.	Use Scenario: Powering laser diode driver and CCD line-scan sensor in ruggedized handheld barcode scanners with intermittent high-current pulses. IC Role / Device Role / Timing Role: Main analog supply LDO with fast load transient response and thermal shutdown - handles repetitive 100 mA–1 A pulsed loads without voltage droop or thermal shutdown. Use Value: 111 °C/W θ_JA and 165°C thermal shutdown enable continuous operation on FR4 PCBs with minimal copper, reducing BOM cost and assembly complexity.

Image Sensor Power Supply

Portable Camera Module

Use Scenario: Providing clean, stable 3.5 V bias to CMOS image sensor analog front-end (AFE) and PLL clock circuitry in smartphone rear cameras.

IC Role / Device Role / Timing Role: Primary LDO regulator delivering low-noise, low-dropout power to noise-sensitive analog blocks; replaces discrete regulators in compact module designs.

Use Value: 48 µV_RMS noise and 75 dB PSRR prevent corruption of pixel-level analog signals, enabling >12-bit effective resolution under dynamic lighting conditions.

Use Scenario: Powering dual-rail camera subsystems (3.5 V AFE + 1.2 V digital core) where sequencing and voltage retention are critical during sleep/wake transitions.

IC Role / Device Role / Timing Role: Fixed-output LDO supplying analog domain; paired with separate digital LDO; EN pin synchronized to application processor's power management unit.

Use Value: Absence of active discharge (B-version) prevents unintended V_OUT collapse during brief EN glitches, ensuring reliable frame capture after wake-up.

Battery-Powered Medical Imaging

Industrial Handheld Scanner

Use Scenario: Regulating power for portable ultrasound probe analog beamforming ICs operating from single-cell Li-ion (3.0–4.2 V).

IC Role / Device Role / Timing Role: High-accuracy, low-drift LDO maintaining 3.5 V ±1% across temperature and load - critical for gain-stable analog signal conditioning.

Use Value: 100 mV dropout at 1 A allows >95% battery utilization down to 3.6 V, extending clinical scan time per charge without compromising signal fidelity.

Use Scenario: Powering laser diode driver and CCD line-scan sensor in ruggedized handheld barcode scanners with intermittent high-current pulses.

IC Role / Device Role / Timing Role: Main analog supply LDO with fast load transient response and thermal shutdown - handles repetitive 100 mA–1 A pulsed loads without voltage droop or thermal shutdown.

Use Value: 111 °C/W θ_JA and 165°C thermal shutdown enable continuous operation on FR4 PCBs with minimal copper, reducing BOM cost and assembly complexity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS7A2035PDQNR	3.5 V fixed, 1 A, 65 mV dropout (typ. at 1 A), 6.5 µA IQ, DSBGA package (0.88×0.88 mm)	Lower dropout and IQ, but smaller package limits thermal headroom at full load; no thermal shutdown hysteresis spec	Select when ultra-low IQ and minimal footprint outweigh thermal robustness requirements in sub-500 mA average-load applications.
MCP1826T-3502E/DB	3.5 V fixed, 1 A, 300 mV dropout (typ. at 1 A), 120 µA IQ, SOT-223 package	Higher dropout and larger SOT-223 footprint; includes output discharge; rated for −40°C to +125°C same as NCP186BMX350TAG	Select when board layout accommodates through-hole or larger surface-mount packages and active discharge is required for system-level power sequencing.

Compared with TPS7A2035PDQNR and MCP1826T-3502E/DB, the NCP186BMX350TAG delivers superior thermal resilience in ultra-compact XDFN8 packaging, balanced dropout (92 mV) and noise (48 µV_RMS) for analog-intensive applications, and guaranteed hysteresis-based thermal recovery - making it optimal for sustained 1 A loads in space-constrained, noise-sensitive imaging systems.

Availability

NCP186BMX350TAG is available at Aetrix Electronics and suitable for portable medical imaging devices, battery-powered camera modules, and industrial handheld scanners requiring stable component supply with consistent parametric performance across temperature and load.

Supply support for NCP186BMX350TAG 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, delivering silicon solutions for automotive, industrial, cloud, and intelligent power systems.

The NCP186 series was designed specifically for high-performance, low-noise power delivery in portable imaging and battery-powered equipment - emphasizing fast transient response, small-footprint packaging, and robust protection features for mission-critical analog subsystems.

FAQ

What is the output voltage tolerance of the NCP186BMX350TAG over temperature and load?

The NCP186BMX350TAG 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 V_{OUT_NOM} ≥ 1.2 V. At 3.5 V nominal output, this translates to 3.465–3.535 V at room temperature and 3.43–3.57 V over full industrial temperature range - verified by production testing and characterized in Table 4 of the datasheet.

Does the NCP186BMX350TAG include output discharge functionality?

No, the NCP186BMX350TAG is the "B" variant and does not include active output discharge. When disabled via the EN pin, the output floats rather than being pulled to GND. This distinguishes it from the "A" version (e.g., NCP186AMX350TAG), which integrates a 34 Ω discharge resistor. The B-version is selected where output voltage retention is required during disable states.

What minimum output capacitance is required for stability with the NCP186BMX350TAG?

The NCP186BMX350TAG is stable with a minimum effective output capacitance of 0.8 µF using X7R or X5R ceramic capacitors. A 1 µF capacitor is recommended for optimal load transient response and PSRR. Capacitor selection must account for DC bias derating - e.g., a 1 µF 0201 6.3 V X7R may deliver only ~0.4 µF at 3.5 V bias, so derated values must meet the 0.8 µF minimum.

How does the thermal performance of the NCP186BMX350TAG compare between XDFN8 and DFN12 packages?

In the XDFN8 1.2×1.6 mm package, the NCP186BMX350TAG has a junction-to-air thermal resistance (θ_JA) of 111 °C/W; in the larger DFN12 4×4 mm package, it drops to 44 °C/W. For a 1 A load with 3.5 V output and 4.5 V input, power dissipation is ~1 W - resulting in ~111°C rise above ambient in XDFN8 versus ~44°C in DFN12. Layout with EPAD-to-GND connection is essential to achieve published θ_JA values.

Can the NCP186BMX350TAG be used with an input voltage below 1.8 V?

No - the absolute minimum operating input voltage for the NCP186BMX350TAG is 1.8 V, as specified in Table 4 and Absolute Maximum Ratings. Operation below 1.8 V risks failure to regulate, increased dropout, or undefined behavior. For sub-1.8 V inputs, consider alternative LDOs such as the NCP170 series (1.2 V min. input) or buck-boost regulators.

NCP186BMX350TAG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: 8-XFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 3.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.135V @ 1A

Current - Output:: 1A

Current - Quiescent (Iq):: 140 µA

Current - Supply (Max):: -

PSRR:: 75dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature, Soft Start

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-XDFN (1.6x1.2)

NCP186BMX350TAG FAQ

1.How can I place an order for NCP186BMX350TAG through Aetrix?

Please submit a Request for Quotation (RFQ) for NCP186BMX350TAG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for NCP186BMX350TAG reliable?

The price and inventory of NCP186BMX350TAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP186BMX350TAG is usually 5 days.

3.What payment methods are accepted for NCP186BMX350TAG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP186BMX350TAG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCP186BMX350TAG?

NCP186BMX350TAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCP186BMX350TAG order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for NCP186BMX350TAG?

For technical support, including NCP186BMX350TAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP186BMX350TAG requirements.

6.How does Aetrix verify that NCP186BMX350TAG is sourced from the original manufacturer or authorized distributors?

All NCP186BMX350TAG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that NCP186BMX350TAG meets industry standards.

7.What is the process for return or replacement of NCP186BMX350TAG?

All NCP186BMX350TAG units undergo pre-shipment inspection (PSI). If there is an issue with NCP186BMX350TAG, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The NCP186BMX350TAG part is unused and in its original packaging.

Return procedure for NCP186BMX350TAG:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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