onsemi NCP693DMN08TCG

Overview

NCP693DMN08TCG from onsemi is a 0.8 V fixed-output, 1 A CMOS low-dropout linear voltage regulator in a DFN 1.8×2 mm package with enable control and auto-discharge functionality. It delivers ±1.0% output accuracy over −40°C to +85°C, supports input voltages up to 6.5 V, and features ultra-low 0.15–0.6 µA standby current when disabled via CE pin - ideal for battery-powered instrumentation requiring stable low-voltage rail generation.

For engineers reviewing the NCP693DMN08TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its 0.8 V output, fast turn-off speed (D-version specific), thermal shutdown at 165°C, 70 dB PSRR at 1 kHz, and compatibility with ceramic or tantalum output capacitors ≥2.2 µF.

Technical Context

The NCP693DMN08TCG integrates a PMOS pass transistor, precision voltage reference, error amplifier, current-limit circuitry, and thermal shutdown protection. Its D-version variant includes dedicated auto-discharge circuitry that actively pulls down VOUT during CE-driven shutdown, enabling rapid output discharge critical for power sequencing in portable systems.

It operates across 1.6–6.5 V input range with dropout as low as 0.67 V at 300 mA (TA = 25°C) and 1.15 V at 1 A. The CE pin has logic-compatible thresholds (V_TH,CE(HI) = 1.0 V, V_TH,CE(LO) = 0.4 V), and the device maintains 45 µV_RMS output noise (10 Hz–100 kHz) under light load.

Key Specifications

Pinout & Package

Package: UDFN-6 (1.8 mm × 2.0 mm, 0.5 mm pitch), exposed thermal pad (EP = GND), RoHS-compliant Pb-free construction (Case 517BA).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1826T-0802E/DB and XC6210B082MR-G, the NCP693DMN08TCG uniquely combines guaranteed auto-discharge, 70 dB PSRR, and defined thermal hysteresis - making it the only choice for portable medical and test equipment demanding precise power sequencing and robust fault handling.

Availability

NCP693DMN08TCG is available at Aetrix Electronics and suitable for portable medical sensors, handheld test meters, and wearable fitness trackers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP693DMN08TCG 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 specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.

The NCP693 series belongs to onsemi's precision low-dropout regulator product line, engineered specifically for battery-powered portable instrumentation where ultra-low quiescent current, fast turn-off, and tight output tolerance are mandatory.

FAQ

What is the function of the CE pin on the NCP693DMN08TCG?

The CE (Chip Enable) pin on the NCP693DMN08TCG is an active-high logic input that controls regulator operation. When CE ≥ 1.0 V, the device powers on and regulates; when CE ≤ 0.4 V, it enters ultra-low-power standby and activates the internal auto-discharge transistor to rapidly pull down VOUT - a feature exclusive to the D-version such as NCP693DMN08TCG.

Does the NCP693DMN08TCG require external capacitors, and what values are recommended?

Yes, the NCP693DMN08TCG requires both input (C_IN) and output (C_OUT) decoupling capacitors. The datasheet specifies minimum 2.2 µF ceramic or tantalum capacitors for both positions, placed as close as possible to the respective pins. Larger C_OUT values improve load transient response and noise rejection, but tantalum types must be selected carefully for ESR to avoid instability.

How does the NCP693DMN08TCG differ from the H-version (e.g., NCP693HMN08TCG)?

The NCP693DMN08TCG differs from the H-version primarily in its fast turn-off capability: the D-version integrates an auto-discharge transistor that actively sinks VOUT current during shutdown, while the H-version lacks this circuitry and relies on external discharge paths. This makes NCP693DMN08TCG essential for applications requiring controlled power-rail collapse, such as medical diagnostics and data logging.

What thermal considerations apply to the NCP693DMN08TCG in high-current operation?

At 1 A output, the NCP693DMN08TCG can dissipate up to ~880 mW depending on input-output differential. Its thermal resistance is 114°C/W (junction-to-ambient, 1 oz copper), so proper PCB layout - including soldering the exposed pad to a thermal plane - is critical. Without adequate copper area, junction temperature may exceed 150°C, triggering thermal shutdown. Derating is required above +85°C ambient.

Is the NCP693DMN08TCG compatible with ceramic output capacitors?

Yes, the NCP693DMN08TCG is fully compatible with ceramic output capacitors, including X5R and X7R dielectrics. The datasheet explicitly states ceramic capacitors are acceptable and recommends ≥2.2 µF. Unlike some older LDOs, it does not require minimum ESR, simplifying design and reducing BOM count compared to tantalum-based alternatives.