onsemi NCV8505D2TADJR4

Overview

NCV8505D2TADJR4 from onsemi is an automotive-grade micropower LDO linear regulator with adjustable output voltage, 400 mA output current capability, ±2.0% output accuracy, and integrated active RESET with programmable delay. It features ENABLE control, low 1.0 µA sleep current, and 200 µA quiescent current in active mode - designed for battery-powered microprocessor systems requiring robust fault protection and precise power sequencing.

For engineers reviewing the NCV8505D2TADJR4 datasheet, pinout, applications, or equivalent options, key selection considerations include its D2PAK-7 package, adjustable output configuration (VADJ feedback), RESET operation down to 1.0 V output, load dump tolerance (±60 V transient), and AEC-Q100 qualification for automotive use.

Technical Context

The NCV8505D2TADJR4 implements a bandgap-referenced error amplifier with unity-gain feedback via the VADJ pin, enabling user-defined output voltages ≥1.3 V. Its RESET circuit operates independently of regulation status and remains valid even when VOUT drops as low as 1.0 V, with hysteresis ensuring noise immunity during brownout recovery.

ENABLE functionality supports direct battery-line connection with internal pull-down and 60 V transient tolerance; DELAY pin sources 4.0 µA typical current to set reset timeout via external capacitor. Protection includes reverse-battery (−15 V), short-circuit, thermal shutdown (150 °C trip), and load-dump survival (60 V peak).

Key Specifications

Pinout & Package

D2PAK-7 (Case 936AB) surface-mount package with exposed thermal pad (Tab = GND); optimized for high-power dissipation in constrained automotive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCV8505D2TADJR4, the fixed-output alternatives reduce design complexity for dedicated voltage rails but sacrifice configurability - NCV8505D2TADJR4 remains optimal when multiple output voltages or future-proofing against voltage changes is required.

Availability

NCV8505D2TADJR4 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS sensor modules, body control modules, infotainment systems, and telematics gateways requiring stable component supply across extended temperature and lifetime requirements.

Supply support for NCV8505D2TADJR4 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 NCV8505 series belongs to onsemi's automotive-qualified LDO portfolio, engineered specifically for harsh-environment power management in engine, chassis, and safety-critical electronic control units.

FAQ

What output voltage range does the NCV8505D2TADJR4 support?

The NCV8505D2TADJR4 supports adjustable output voltages starting from 1.30 V (its internal reference) upward, configured via an external resistor divider connected to the VADJ pin. The datasheet confirms minimum output of 1.274 V (typ) and maximum of 1.339 V (max) at unity gain, scalable higher with proper feedback ratio - enabling common rails like 1.8 V, 2.5 V, 3.3 V, or 5.0 V.

Does the NCV8505D2TADJR4 require an external capacitor on the DELAY pin?

Yes, the NCV8505D2TADJR4 requires an external capacitor connected between the DELAY pin and ground to set the RESET timeout period. The delay time follows t_DELAY = C_DELAY × (V_DT − V_{DELAY_LOW}) / I_CHARGE, where typical charge current is 4.0 µA and switching threshold is 1.3 V (adjustable version). A 33 nF capacitor yields ~14 ms delay - critical for meeting automotive boot timing requirements.

How does the RESET function behave when VOUT drops below regulation?

The NCV8505D2TADJR4 asserts RESET low whenever VOUT falls below its hysteresis-based threshold - 1.19 V (low) to 1.22 V (high) for the adjustable version - and remains asserted until VOUT recovers above the high threshold. This independent circuit operates reliably down to 1.0 V output, ensuring valid reset signaling even during severe brownout conditions that would disable conventional regulators.

Is the NCV8505D2TADJR4 compatible with standard D2PAK-7 footprints?

Yes, the NCV8505D2TADJR4 uses the industry-standard D2PAK-7 (Case 936AB) package with defined mechanical dimensions: 10.67 mm × 9.53 mm body, 1.98 mm height, and 1.27 mm pitch. Its thermal pad (Tab = GND) aligns with IPC-7351B SOIC-7 variant land patterns - enabling drop-in compatibility with existing D2PAK-7 assembly processes and reflow profiles.

What protection features does the NCV8505D2TADJR4 include for automotive environments?

The NCV8505D2TADJR4 integrates reverse-battery protection (−15 V), short-circuit current limiting (~500 mA typical), thermal shutdown (150 °C trip), and 60 V peak load dump transient tolerance. These features eliminate the need for external protection components in 12 V/24 V automotive systems - reducing bill-of-materials cost and improving reliability in under-hood and powertrain applications.