onsemi NCV4275DSG

Overview

NCV4275DSG from onsemi is an automotive-grade 5.0 V, ±2% low-dropout linear voltage regulator delivering up to 450 mA output current with active reset functionality. It features 500 mV max dropout at 300 mA, overcurrent and thermal shutdown protection, and operates across −40°C to +150°C junction temperature. Designed for engine control units and body electronics requiring stable 5 V supply under harsh transients.

For engineers reviewing the NCV4275DSG datasheet, pinout, applications, or equivalent options, this page provides verified technical context, package-specific thermal data, reset timing behavior, fault protection thresholds, and validated automotive alternatives - all confirmed against onsemi's official Rev. 16 datasheet (April 2010).

Technical Context

The NCV4275DSG uses a PNP pass transistor controlled by a bandgap-referenced error amplifier, enabling ultra-low dropout (250 mV typ. at 300 mA) and tight output regulation (±2% over load, line, and temperature). Its active reset output (RO) is open-collector, asserting low when VQ falls below 4.53 V and releasing after programmable delay via external capacitor on pin D.

Protection includes +45 V peak transient tolerance, −42 V reverse voltage capability, short-circuit current limiting (700 mA typ.), and thermal shutdown at 150°C. The device maintains stability with 22 μF output capacitance and ESR ≤ 5.0 Ω, and draws only 135–150 μA quiescent current at 1 mA load and 25°C ambient.

Key Specifications

Pinout & Package

D2PAK-5 surface-mount package (Case 936A), Pb-free, with exposed tab thermally and electrically connected to pin 3 (GND). Pin 1 (I) accepts 5.5–42 V battery input; pin 5 (Q) delivers regulated 5.0 V; pin 2 (RO) provides open-collector reset signal; pin 4 (D) sets reset delay via external capacitor.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCV4275DSG, NCV8664CDT50RKG offers higher current and lower I_q but removes reset integration, increasing BOM count; TLV73350PDBVR improves dropout and size but sacrifices automotive reliability and protection - making NCV4275DSG the optimal choice for safety-critical, reset-dependent automotive subsystems.

Availability

NCV4275DSG is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera systems, and telematics control units requiring stable component supply under automotive qualification and long-term lifecycle support.

Supply support for NCV4275DSG 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, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The NCV4275DSG belongs to onsemi's SMART REGULATOR® family of automotive-qualified LDOs, engineered specifically for harsh-vehicle-environment power delivery with integrated protection and reset functions.

FAQ

What is the maximum input voltage the NCV4275DSG can withstand during load dump events?

The NCV4275DSG is rated for +45 V peak transient voltage per ISO 7637-2 Pulse 5a, enabling direct connection to 12 V automotive battery rails without external TVS clamping. This rating applies to short-duration transients (≤400 ms), and the device sustains operation without latch-up or parametric shift when exposed within these limits. The NCV4275DSG incorporates internal circuitry to absorb such surges without requiring external protection components in most standard implementations.

Does the NCV4275DSG require an external pull-up resistor on the RO pin?

Yes, the NCV4275DSG RO pin is an open-collector output and must be pulled up externally - typically to VQ using a 5.0 kΩ resistor - to generate a valid logic-high signal when the output voltage is stable. Without this pull-up, RO remains floating and cannot drive a microcontroller's reset input reliably. The NCV4275DSG datasheet specifies that RO leakage is ≤10 μA at 5.0 V, confirming compatibility with standard pull-up values.

Can the NCV4275DSG operate with ceramic output capacitors?

No - the NCV4275DSG is not stable with low-ESR ceramic capacitors alone. Its control loop requires ≥1.0 Ω ESR for phase margin; stability is guaranteed only with 22 μF aluminum or tantalum capacitors having ESR ≤ 5.0 Ω. Using ceramic capacitors (ESR ≈ 10–100 mΩ) risks oscillation, as shown in Figure 2 of the NCV4275DSG datasheet. A hybrid approach - ceramic + series resistor - may work but is not validated.

What is the thermal resistance (R_JA) of the NCV4275DSG in its D2PAK package?

The NCV4275DSG in D2PAK (Case 936A) has R_JA = 74.8°C/W on a 0.4 sq. in. copper spreader board and 41.6°C/W on a 1.2 sq. in. board (per datasheet Table 2). These values assume 1 oz. copper thickness and FR4 substrate. Actual R_JA depends heavily on PCB layout - doubling copper area reduces R_JA by ~30%. The NCV4275DSG's exposed tab must be soldered to a thermal pad for effective heat transfer.

How does the reset delay time of the NCV4275DSG scale with different capacitor values on pin D?

The NCV4275DSG reset delay time scales linearly with capacitor value on pin D: t_RD ≈ C_D × 1.8 V / 5.5 μA. For example, 22 nF yields ~7 ms, 100 nF yields ~33 ms, and 47 nF yields 16 ms (typical). The upper timing threshold (VDU) is 1.5–2.2 V and charging current (ID,C) is 3.0–9.0 μA, so actual delay varies within ±30% across temperature and unit-to-unit. The NCV4275DSG datasheet validates stability across this range.