onsemi NCP4640H020T1G

Overview

NCP4640H020T1G from onsemi is a CMOS 50 mA linear voltage regulator with 2.0 V fixed output, 4 V to 36 V input range, ±2% output accuracy, ultra-low quiescent current (9–20 µA), and integrated thermal shutdown, short-circuit, and peak-current protection. It serves as a primary power supply for automotive infotainment systems requiring stable low-noise bias under wide-input-voltage conditions.

For engineers reviewing the NCP4640H020T1G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 20 mA (0.40 V max), line regulation (0.05%/V), PSRR (30 dB @ 1 kHz), thermal shutdown threshold (150°C), and SOT-89-5 package compatibility with high-temperature industrial layouts.

Technical Context

The NCP4640H020T1G implements a CMOS-based LDO architecture with internal bandgap reference, error amplifier, and pass transistor. Its enable-controlled operation uses a TTL-compatible CE pin (V_CEH = 1.5 V min) to manage system-level power sequencing without external logic.

Protection circuitry includes foldback current limiting (50 mA short-circuit limit), thermal shutdown with hysteresis (150°C trip / 125°C release), and robust ESD tolerance (2 kV HBM). The device operates across −40°C to +105°C junction temperature and supports input transients up to 60 V for 200 ms.

Key Specifications

Pinout & Package

SOT-89-5 package: thermally enhanced 5-pin surface-mount outline with three ground pins (pins 2, 4, 5) for low-impedance return path and improved thermal dissipation (R_JA = 111°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2002E/TT and TLV73320PDBVR, the NCP4640H020T1G uniquely balances 36 V input tolerance, 2.0 V precision, ultra-low IQ, and automotive-grade protection - making it the sole option for direct-battery-fed 2.0 V rails in harsh environments without additional conversion stages.

Availability

NCP4640H020T1G is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, home appliance control logic, and office equipment standby supplies requiring stable component supply across extended temperature and voltage ranges.

Supply support for NCP4640H020T1G 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, with leadership in automotive, industrial, cloud, and IoT solutions.

The NCP4640 series belongs to onsemi's high-voltage LDO portfolio, designed specifically for automotive and industrial applications demanding wide-input-voltage operation, robust protection, and long-term reliability under thermal stress.

FAQ

What is the maximum input voltage rating for the NCP4640H020T1G?

The NCP4640H020T1G has an absolute maximum input voltage of 50 V, with a peak rating of 60 V for durations up to 200 ms. Its recommended operating input range is 4 V to 36 V. This allows the NCP4640H020T1G to withstand automotive load-dump transients and operate reliably across 12 V and 24 V battery systems without external clamping circuitry.

Does the NCP4640H020T1G require external capacitors for stability?

The NCP4640H020T1G is internally compensated and stable without external capacitors, but the datasheet recommends 100 nF ceramic capacitors on both VIN and VOUT pins for optimal transient response and noise suppression. These must be placed as close as possible to the respective pins. The NCP4640H020T1G achieves this stability using its CMOS pass element and proprietary compensation scheme, eliminating the need for larger or specialized output capacitance.

What is the dropout voltage specification for the NCP4640H020T1G at full rated load?

At 20 mA output current and 25°C, the NCP4640H020T1G exhibits a maximum dropout voltage of 0.40 V. This means the device can maintain regulation with input as low as 2.4 V while delivering 2.0 V ±2%. Dropout increases slightly at higher temperatures and currents - e.g., up to 0.60 V at 105°C and 20 mA - as confirmed in Figure 7 of the NCP4640H020T1G datasheet.

How does the CE (chip enable) pin function on the NCP4640H020T1G?

The CE pin on the NCP4640H020T1G is active-high with a threshold of 1.5 V minimum for logic high and 0.3 V maximum for logic low. When CE is high, the regulator delivers 2.0 V; when CE is low or grounded, output is disabled and quiescent current drops to ≤1 µA. The NCP4640H020T1G must never be left floating - indeterminate CE voltage causes unstable output or excessive current draw.

Is the NCP4640H020T1G qualified for automotive applications?

The NCP4640H020T1G meets AEC-Q100 stress test requirements for human-body-model ESD (2000 V) and machine-model ESD (200 V), and operates across −40°C to +105°C junction temperature. While not formally AEC-Q100 certified as a complete device, its design, test methodology, and qualification data align with automotive reliability standards - making the NCP4640H020T1G widely deployed in automotive infotainment, body control, and telematics modules.