onsemi NCV4275ADT33RKG

Overview

NCV4275ADT33RKG from onsemi is an automotive-grade LDO linear voltage regulator delivering a stable 3.3 V ±2% output at up to 450 mA, featuring integrated active reset output (RO), programmable reset delay via external capacitor on pin D, and robust fault protection including +45 V transient immunity, −42 V reverse voltage tolerance, thermal shutdown at 150°C, and short-circuit protection. It is designed for body electronics power rails requiring AEC-Q100 Grade 1 compliance.

For engineers reviewing the NCV4275ADT33RKG datasheet, pinout, applications, or equivalent options, this page provides verified technical context, validated pin functions, real-world automotive use cases, and two confirmed alternative parts with documented functional and packaging differences.

Technical Context

The NCV4275ADT33RKG uses a PNP pass transistor controlled by a bandgap-referenced error amplifier to achieve low dropout (≤1170 mV at 400 mA) and high temperature stability (±0.5 mV/K drift). Its reset generator monitors output voltage (VQ) and triggers RO low when VQ falls below 3.0–3.2 V, with timing set by capacitor CD on pin D and charge current ID,C = 2.0–9.0 µA.

It operates across −40°C to +150°C junction temperature and supports input voltages from 4.4 V to 42 V for the 3.3 V version. Fault protection includes overcurrent limiting (450–700 mA), thermal overload shutdown, and ESD resilience per AEC-Q100-002/003/011 standards (4 kV HBM, 200 V MM, 1000 V CDM).

Key Specifications

Pinout & Package

DPAK-5 surface-mount package (Case 175AA), thermally enhanced with tab internally connected to Pin 3 (GND); suitable for PCB copper area ≥168 mm² to maintain R_JA ≤100.9°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCV4275ADT33RKG, the D2PAK alternative offers superior thermal capability but larger footprint, while the TLV73333PDBVR reduces size and I_q but removes critical automotive reset functionality - making NCV4275ADT33RKG the only single-chip solution meeting AEC-Q100 Grade 1 with integrated reset and 45 V transient tolerance.

Availability

NCV4275ADT33RKG is available at Aetrix Electronics and suitable for automotive body electronics, door module power supplies, seat control units, and lighting control modules requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for NCV4275ADT33RKG 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, sensors, and automotive electronics.

The NCV4275A product line delivers automotive-qualified LDO regulators with integrated reset and high-voltage fault protection, engineered specifically for body control, comfort, and convenience systems operating in harsh vehicle environments.

FAQ

What is the maximum input voltage the NCV4275ADT33RKG can withstand during load dump events?

The NCV4275ADT33RKG is rated for +45 V peak transient voltage per ISO 7637-2 Pulse 5a, enabling direct connection to automotive battery rails without external transient voltage suppressors. This rating is guaranteed by design and validated per AEC-Q100 stress testing protocols, ensuring reliable operation during engine cranking and alternator load dump scenarios.

Does the NCV4275ADT33RKG require an external pull-up resistor on the RO pin?

Yes, the RO pin is an open-collector output and must be pulled up externally-typically with a 5.0 kΩ resistor to VQ-to generate a valid logic-high reset signal for microcontrollers. Without this pull-up, the reset signal remains floating and cannot assert a clean high-to-low transition during power-up or brown-out events.

What output capacitor specifications ensure stability for the NCV4275ADT33RKG?

Stability is guaranteed with a 22 µF output capacitor having ESR ≤3.5 Ω for the 3.3 V version. Ceramic (e.g., Murata GRM32ER71A226ME20), tantalum, or aluminum electrolytic types are acceptable. The datasheet confirms stable operation across wide ESR ranges (0.01–10 Ω) and capacitance values (1–100 µF), provided minimum ESR limits are met.

How is the reset delay time calculated for the NCV4275ADT33RKG?

Reset delay t_RD = C_D × V_DU / I_D,C, where C_D is the timing capacitor on pin D, V_DU is the upper timing threshold (0.7–1.6 V for 3.3 V version), and I_D,C is the internal charge current (2.0–9.0 µA). With C_D = 47 nF, typical t_RD is 10–22 ms-verified in Figure 22 and Application Information section.

Is the NCV4275ADT33RKG pin-compatible with the standard NCV4275 series?

Yes, the NCV4275ADT33RKG is explicitly stated as pin-for-pin compatible with the base NCV4275 family, including identical pinout (I, RO, GND, D, Q), package outline (DPAK-5), and functional behavior. This allows drop-in replacement in existing designs using 3.3 V variants without PCB or firmware changes.