onsemi NCV8772CDT504RKG

Overview

NCV8772CDT504RKG from onsemi is a 5.0 V, 350 mA automotive-grade LDO regulator with integrated reset output (RO), enable control, ultra-low quiescent current (18 µA typ), and AEC-Q100 Grade 1 qualification. It delivers stable power to microprocessors in body control modules and instrument clusters under harsh 40 V input conditions.

For engineers reviewing the NCV8772CDT504RKG datasheet, pinout, applications, or equivalent options, key selection criteria include its 16 ms reset delay, ±2% output accuracy, reverse output current protection, and DPAK-5 thermal performance (R_JA = 47.1 °C/W).

Technical Context

The NCV8772CDT504RKG integrates a precision bandgap reference, current-limiting circuitry, thermal shutdown at 175 °C, and an open-drain reset output with 93% V_OUT threshold and internal 30 kΩ pull-up for 5 V operation. Its enable logic accepts 0.8–2.5 V low-to-high transition.

Designed for automotive battery-connected systems, it operates across −40 °C to +150 °C junction temperature, supports input voltages up to 40 V (load dump suppressed), and maintains regulation down to 4.5 V input - critical for ignition-off microprocessor retention.

Key Specifications

Pinout & Package

DPAK-5 (Case 175AA) package with exposed thermal pad (Pin 3/TAB connected to GND). Optimized for high-power dissipation on 1 oz copper PCBs (R_JA = 47.1 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCV8772CDT504RKG, the D2PAK variant offers lower thermal resistance but requires more board area, while the TLV73350PDBVR reduces quiescent current by 72% but forfeits automotive safety features, reset functionality, and robustness against load dump.

Availability

NCV8772CDT504RKG is available at Aetrix Electronics and suitable for body control modules, instrument clusters, and occupant protection systems requiring stable component supply with AEC-Q100 compliance and long-term automotive lifecycle support.

Supply support for NCV8772CDT504RKG 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 for automotive, industrial, cloud, and IoT applications.

The NCV8772C series is part of onsemi's automotive power management portfolio, designed specifically for always-on microprocessor power in harsh vehicle environments with ultra-low I_Q and integrated system supervision.

FAQ

What is the reset delay time configured for NCV8772CDT504RKG?

The NCV8772CDT504RKG is factory-configured with a 16 ms reset delay time (indicated by "4" in the suffix), meeting common automotive boot timing requirements. This value is fixed per device ordering code and cannot be adjusted externally. The reset assertion occurs when V_OUT drops below 93% of nominal (4.65 V), and the 16 ms timer begins at that point, ensuring consistent MCU initialization sequencing across temperature and supply conditions. NCV8772CDT504RKG uses this precise delay to align with ASAM standards for electronic control unit power-up behavior.

Does NCV8772CDT504RKG require an external pull-up resistor on the RO pin?

No, NCV8772CDT504RKG does not require an external pull-up on the RO pin because it is the 5.0 V output variant and includes an internal 30 kΩ pull-up resistor connected to V_OUT. This eliminates BOM cost and layout area versus 3.3 V variants, which use open-drain RO and require external pull-up. The internal pull-up ensures valid logic-high levels (≥4.5 V) at RO when inactive, and the pin sinks ≤200 µA when asserted low - compatible with standard CMOS inputs on automotive microcontrollers. NCV8772CDT504RKG leverages this integration to simplify system-level reset circuitry.

What is the maximum continuous output current for NCV8772CDT504RKG at 85 °C ambient?

At 85 °C ambient temperature with a standard 645 mm² 1 oz copper PCB, NCV8772CDT504RKG supports up to 350 mA continuous output current. This is validated by its thermal resistance (R_JA = 47.1 °C/W) and maximum junction temperature limit of 150 °C. Power dissipation is calculated as P_D = (V_IN − 5.0 V) × I_OUT + V_IN × I_Q; at V_IN = 13.5 V and I_OUT = 350 mA, P_D ≈ 3.0 W, resulting in ~145 °C junction temperature - within safe operating limits. NCV8772CDT504RKG maintains full-rated current without derating up to 85 °C ambient due to its DPAK-5 thermal design.

How does the enable function reduce power consumption in NCV8772CDT504RKG?

The enable (EN) pin on NCV8772CDT504RKG reduces total system quiescent current from 18 µA (active) to ≤1 µA (disabled) by shutting down internal bias circuitry and disconnecting the pass transistor. When EN is pulled low (<0.8 V), the regulator enters shutdown mode with no output regulation, and reverse output current protection remains active. This feature enables deep-sleep states in automotive ECUs - for example, reducing battery drain from 25 µA to <2 µA in a body control module during vehicle off-mode. NCV8772CDT504RKG's EN interface is compatible with standard 3.3 V/5 V GPIOs and requires no external level-shifting.

Is NCV8772CDT504RKG qualified for automotive safety-critical systems per ISO 26262?

No, NCV8772CDT504RKG is not developed to ISO 26262 requirements and carries no ASIL rating. It is AEC-Q100 Grade 1 qualified for reliability and environmental stress, but lacks the systematic capability, diagnostic coverage, and safety documentation required for ASIL-B or higher applications. For safety-critical rails (e.g., airbag deployment logic), onsemi recommends pairing NCV8772CDT504RKG with an external voltage supervisor like the NCV301 or using a dedicated safety power IC. NCV8772CDT504RKG serves best in non-safety-critical domains such as infotainment, comfort, and body electronics where functional safety is managed at the system level.