onsemi NCV4275DSR4G

Overview

NCV4275DSR4G from onsemi is an automotive-grade 5.0 V ±2% low-dropout linear voltage regulator with 450 mA output current capability, active open-collector reset output (RO), and integrated fault protection including thermal shutdown, overcurrent, ±42 V reverse voltage, and +45 V transient voltage tolerance. It operates across −40°C to +150°C and supports input voltages from 5.5 V to 42 V - designed for engine control units, body electronics, and infotainment power rails.

For engineers reviewing the NCV4275DSR4G datasheet, pinout, applications, or equivalent options, key selection criteria include its 500 mV max dropout at 300 mA, reset delay programmability via external capacitor (e.g., 47 nF yields ~16 ms), stable operation with 22 µF output capacitance and ESR ≤ 5.0 Ω, and D2PAK-5 surface-mount package with tab-connected GND for thermal management.

Technical Context

The NCV4275DSR4G uses a PNP pass transistor controlled by a bandgap-referenced error amplifier to achieve low dropout and high temperature stability. Its regulation loop maintains 5.0 V output across wide load (100 µA–400 mA) and line (6.0–40 V) variations while minimizing quiescent current - dropping to 10–15 mA at 250 mA load and 23–35 mA at 400 mA.

Reset functionality is implemented via internal timing circuitry: the D pin charges with 5.5 µA current to upper threshold (1.8 V typical), generating a programmable delay before RO pulls low; reset reaction time is 1.5–4.0 µs. Fault protection includes current limiting (700 mA peak), thermal shutdown at 150°C (guaranteed), and robust survival under automotive transients.

Key Specifications

Pinout & Package

D2PAK-5 surface-mount package (Case 936A) with exposed tab thermally and electrically connected to Pin 3 (GND). Package dimensions: 10.6 mm × 9.2 mm × 4.3 mm (L × W × H), 1.222 in² copper spreader recommended for R_JA = 41.6°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73350PDBVR and TPS7B6750QPWPRQ1, the NCV4275DSR4G delivers optimal balance of automotive ruggedness, reset programmability, thermal performance in D2PAK, and cost-efficiency for mid-power ECU/BCM applications - without requiring enable logic or diagnostic overhead.

Availability

NCV4275DSR4G is available at Aetrix Electronics and suitable for engine control units, body control modules, and infotainment systems requiring stable component supply across extended temperature ranges and automotive lifecycle demands.

Supply support for NCV4275DSR4G 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 connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The NCV4275DSR4G belongs to onsemi's SMART REGULATOR® family - engineered specifically for harsh automotive environments with emphasis on transient survivability, thermal resilience, and functional safety support through integrated reset and protection features.

FAQ

What is the maximum input voltage the NCV4275DSR4G can withstand without damage?

The NCV4275DSR4G is rated for −42 V reverse voltage and +45 V peak transient voltage per ISO 7637-2, meaning it survives load dump events without external protection. Its continuous operating input range is 5.5 V to 42 V. Exceeding 42 V continuously risks permanent damage, though short-duration transients up to +45 V are tolerated. Always verify system-level clamping margins in actual ECU designs using the NCV4275DSR4G.

Does the NCV4275DSR4G require an external pull-up resistor on the RO pin?

Yes, the NCV4275DSR4G RO pin is an open-collector output and requires an external pull-up resistor to V_Q. The datasheet specifies a typical value of 5.0 kΩ. This resistor establishes the high state of the reset signal when the output voltage is valid; RO pulls low when V_Q falls below 4.65 V. Omitting the pull-up will leave RO floating and prevent reliable reset signaling in systems using the NCV4275DSR4G.

Can the NCV4275DSR4G operate with ceramic output capacitors?

No - the NCV4275DSR4G is not stable with low-ESR ceramic capacitors. Stability is guaranteed only with 22 µF aluminum or tantalum electrolytic capacitors having ESR between 0.5 Ω and 5.0 Ω. Ceramic capacitors typically have ESR < 0.1 Ω and will cause oscillation or instability. The NCV4275DSR4G's compensation is optimized for higher-ESR output caps common in automotive applications, as confirmed in Figure 2 and Application Information section.

What thermal performance can be expected from the NCV4275DSR4G in a standard PCB layout?

With a 1.222 in² (788 mm²) copper spreader on 1 oz FR4, the NCV4275DSR4G achieves R_JA = 41.6°C/W. At 450 mA load and 13.5 V input, power dissipation is ~3.8 W, resulting in ~158°C junction rise above ambient - requiring careful thermal design. Derating to 350 mA or adding thermal vias under the tab is recommended for sustained operation above 70°C ambient. The D2PAK package's tab-to-GND connection is essential for this performance.

How is the reset delay time calculated for the NCV4275DSR4G?

The reset delay time t_RD for the NCV4275DSR4G is calculated as t_RD = C_D × V_DU / I_D,C, where C_D is the external timing capacitor on Pin 4, V_DU = 1.8 V (typical upper threshold), and I_D,C = 5.5 µA (typical charging current). For C_D = 47 nF, t_RD ≈ 15.4 ms - matching the datasheet's 10–22 ms specification range. This formula allows precise delay tuning across operating temperatures using the NCV4275DSR4G's documented parameters.