onsemi NCV8505D2T25R4G

Overview

NCV8505D2T25R4G from onsemi is a 2.5 V, 400 mA automotive-grade LDO linear regulator with ENABLE, active RESET (operational down to 1.0 V output), and programmable delay timing. It features ±2.0% output accuracy, 600 mV max dropout at 400 mA, and <1.0 µA sleep current - designed for battery-powered microprocessor systems requiring robust fault protection and AEC-Q100 compliance.

For engineers reviewing the NCV8505D2T25R4G datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, automotive-qualified alternatives, and supply-chain support details specific to the D2PAK-7 packaged 2.5 V variant.

Technical Context

The NCV8505D2T25R4G integrates a precision bandgap reference (1.8 V for fixed versions), error amplifier, current-limiting circuitry, thermal shutdown (150 °C trip), and independent RESET detection that remains functional even when VOUT drops to 1.0 V. Its ENABLE input supports direct battery tie with internal pull-down and withstands load dump transients up to +60 V.

RESET activation uses hysteresis (25 mV for 2.5 V option) and is triggered during power-up or if VOUT falls below 2.30 V (low threshold). The DELAY pin sources 4.0 µA typical current to an external capacitor to set reset timeout - a latched function that discharges fully after any regulation violation before rearming.

Key Specifications

Pinout & Package

D2PAK-7 (Case 936AB) package with exposed thermal pad (Tab = GND); optimized for high-power dissipation in automotive PCB layouts with copper pour and thermal vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCV8505D2T25R4G, NCV8505D2T25G offers identical electrical performance but different packaging logistics, while TLV73325PDBVR trades automotive robustness and integrated monitoring for smaller size and lower cost - making it unsuitable for vehicle environments requiring load dump immunity or guaranteed reset behavior.

Availability

NCV8505D2T25R4G is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera power, ECU sensor interfaces, telematics always-on rails, and other applications requiring stable component supply with full AEC-Q100 traceability and long-lifecycle support.

Supply support for NCV8505D2T25R4G 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCV8505D2T25R4G belongs to onsemi's NCV8505 series of micropower LDOs - engineered specifically for automotive microprocessor power domains where RESET sequencing, ultra-low sleep current, and extreme environmental resilience are mandatory.

FAQ

What is the minimum input voltage required for NCV8505D2T25R4G to regulate at 2.5 V?

The NCV8505D2T25R4G requires a minimum input voltage of 4.5 V to maintain 2.5 V regulation across temperature and load. Below this, the RESET function may assert low even if output remains within specification - a design feature ensuring microprocessor safety during undervoltage conditions. This threshold is specified in the Electrical Characteristics table under "Minimum VIN" for 2.5 V, 3.3 V, and Adjustable options.

Does NCV8505D2T25R4G require an external capacitor on the DELAY pin, and what value is recommended?

Yes, NCV8505D2T25R4G requires an external capacitor on the DELAY pin to set the RESET timeout period. A 33 nF capacitor yields approximately 14 ms delay using typical charge current (4.0 µA) and switching threshold (1.8 V). The capacitor must be placed close to the pin with low-ESR construction; ceramic types are acceptable here since DELAY is not part of the main regulation loop.

Can NCV8505D2T25R4G be used without connecting the SENSE pin?

Yes, NCV8505D2T25R4G can be used without remote sensing by connecting the SENSE pin directly to VOUT. This configuration disables Kelvin sensing and reverts to standard local feedback, maintaining ±2.0% output accuracy under typical PCB layout conditions. The SENSE pin is optional and only needed when trace resistance between VOUT and load introduces >10 mV regulation error.

What is the maximum allowable power dissipation for NCV8505D2T25R4G in a typical automotive PCB layout?

Maximum power dissipation for NCV8505D2T25R4G depends on thermal design. With RJA ≈ 30 °C/W (typical for D2PAK-7 on 2 oz copper with 6 thermal vias), and maximum junction temperature of 150 °C, the safe PD(max) at 85 °C ambient is ~2.2 W. At 400 mA load and 12 V input, power dissipation is (12 V − 2.5 V) × 0.4 A = 3.8 W - requiring heatsinking or reduced input voltage to avoid thermal shutdown.

Is NCV8505D2T25R4G compatible with lead-free reflow soldering processes?

Yes, NCV8505D2T25R4G is Pb-Free (RoHS-compliant) and rated for lead-free reflow with a peak temperature of 240 °C (60 seconds above 183 °C). The D2PAK-7 package is qualified per J-STD-020 moisture sensitivity level 3, requiring bake prior to reflow if exposed to ambient for >168 hours. Full process guidelines are in onsemi's Soldering and Mounting Techniques Reference Manual.