onsemi NCP694HSAN25T1G

Overview

NCP694HSAN25T1G from onsemi is a 2.5 V fixed-output, 1 A CMOS low-dropout linear voltage regulator in HSON-6 package, featuring −3 mV load regulation at 1 A, 70 dB PSRR at 1 kHz, and ultra-low 100 µA supply current - designed for portable battery-powered instrumentation requiring stable low-voltage biasing.

For engineers reviewing the NCP694HSAN25T1G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 1 A (0.32 V), thermal shutdown at 150°C, enable threshold logic compatibility (1.0 V high / 0.4 V low), and Pb-free HSON-6 footprint suitability for space-constrained handheld designs.

Technical Context

The NCP694HSAN25T1G integrates a PMOS pass transistor, precision voltage reference (1.0 V typ), error amplifier, and thermal shutdown circuitry - enabling stable 2.5 V output with minimal headroom. Its enable-controlled standby mode reduces quiescent current to 1.0 µA, supporting battery longevity in intermittent-operation systems.

Unlike standard LDOs, this device delivers −3 mV load regulation across 1 mA–1 A and maintains 70 dB power supply rejection up to 1 kHz, making it suitable for noise-sensitive analog rails in camcorders and portable comms equipment where input ripple and load transients must be tightly suppressed.

Key Specifications

Pinout & Package

HSON-6 package (Case 506AE): 2.9 mm × 3.0 mm × 0.9 mm body, exposed thermal pad, 0.95 mm pitch, RoHS-compliant Pb-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-2502E/MB and TLS850F2BTV50, the NCP694HSAN25T1G uniquely balances 1 A capability, 0.32 V dropout at full load, and HSON-6 footprint - making it optimal for space-constrained, high-current portable instrumentation where thermal efficiency and noise performance are prioritized.

Availability

NCP694HSAN25T1G is available at Aetrix Electronics and suitable for portable medical sensors, handheld test meters, camcorder image processing, and wireless sensor nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for NCP694HSAN25T1G 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, and sensor solutions for automotive, industrial, and portable electronics.

The NCP694HSAN25T1G belongs to onsemi's NCP694 series of super-low-dropout LDOs, engineered specifically for battery-powered instrumentation demanding high current, low noise, and precise voltage regulation in minimal PCB area.

FAQ

What is the minimum input voltage required for NCP694HSAN25T1G to regulate 2.5 V at 1 A?

The NCP694HSAN25T1G requires a minimum input voltage of 2.82 V to maintain regulation at 1 A load, based on its typical 0.32 V dropout voltage. At lower input voltages, output will drop below 2.5 V or regulation will be lost. The absolute minimum operating input is 1.4 V, but usable regulation only begins above Vin = Vout + V_dropout.

Does NCP694HSAN25T1G require external capacitors, and what values are recommended?

Yes, the NCP694HSAN25T1G requires both input and output capacitors. A 4.7 µF ceramic capacitor is recommended for C_IN placed within 2 mm of pins 6 (V_IN) and 4 (GND), and a 4.7 µF ceramic capacitor for C_OUT between pins 1/2 (V_OUT) and 4 (GND). Larger values improve transient response but must maintain ESR < 100 mΩ to avoid instability.

How does the CE pin function on NCP694HSAN25T1G, and what happens when it is left unconnected?

The CE pin on NCP694HSAN25T1G is active-high: pulling it ≥1.0 V enables regulation; pulling it ≤0.4 V disables output. If unused, CE must be tied to V_IN (not left floating) to ensure reliable startup. Leaving it unconnected risks erratic enable behavior due to noise coupling or leakage paths.

Is NCP694HSAN25T1G compatible with ceramic output capacitors, and are there any stability concerns?

Yes, NCP694HSAN25T1G is explicitly designed for ceramic output capacitors (≥4.7 µF). Stability is ensured when ESR is low (<100 mΩ); high-ESR tantalum capacitors may cause oscillation. The device's internal compensation eliminates need for external RC networks, simplifying layout for compact portable designs.

What thermal considerations apply to NCP694HSAN25T1G in HSON-6 package at full 1 A load?

At 1 A and 2.82 V input (0.32 V dropout), NCP694HSAN25T1G dissipates 320 mW. With R_JA = 111°C/W, junction temperature rise is ~35.5°C above ambient. To stay below 150°C max T_J, ambient must remain <114.5°C - achievable with minimal copper pour. For sustained 1 A operation, connect the exposed thermal pad to ≥100 mm² inner-layer ground plane.