onsemi NCV8501D33

Overview

NCV8501D33 from onsemi is a fixed-output 3.3 V, 150 mA automotive-grade LDO linear regulator with ENABLE, active RESET (with programmable delay), and FLAG monitor functions. It delivers ±2.0% output accuracy, 600 mV max dropout at 150 mA, and 90 µA quiescent current at light load - designed for battery-powered microprocessor systems requiring early warning reset signaling and robust fault protection.

For engineers reviewing the NCV8501D33 datasheet, pinout, applications, or equivalent options, this page provides verified technical context, SO-8 pin mapping, automotive-grade reliability specs (−40 °C to +150 °C), and real-world selection guidance for microcontroller power management in harsh environments.

Technical Context

The NCV8501D33 integrates a precision bandgap reference, error amplifier, and independent low-voltage detection circuitry enabling RESET assertion down to VOUT = 1.0 V. Its FLAG comparator monitors VOUT via the MON pin with 1.20 V typical threshold and 20–100 mV hysteresis, providing early warning before RESET activation.

RESET timing is controlled by an external capacitor on the DELAY pin, charged at 2.5 µA typical; the delay time follows t_DELAY = C_DELAY × (V_DT − V_{RESET_LOW}) / I_CHARGE. ENABLE supports direct battery connection with built-in overvoltage protection up to +60 V transient and reverse-battery tolerance to −15 V.

Key Specifications

Pinout & Package

NCV8501D33 is housed in an SOIC-8 NB (Case 751-07) package - 4.9 mm × 3.9 mm × 1.5 mm, Pb-free, with gull-wing leads and 1.27 mm pitch. Thermal resistance R_JA = 165 °C/W (JEDEC standard board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCV8501D33, NCV8501D33R2G offers identical performance in volume packaging, while TLV73333PDBVR trades integrated monitoring for higher current and lower dropout - making it suitable only where external reset logic is already present.

Availability

NCV8501D33 is available at Aetrix Electronics and suitable for automotive body electronics, instrument clusters, and telematics systems requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for NCV8501D33 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 is a global semiconductor supplier focused on energy-efficient electronics, with leadership in automotive, industrial, and cloud power solutions.

The NCV8501D33 belongs to the NCV8501 series of micropower LDOs engineered specifically for automotive microprocessor power management - emphasizing reset integrity, early warning capability, and survivability in harsh electrical environments.

FAQ

What is the minimum input voltage required for NCV8501D33 to regulate 3.3 V at 150 mA?

The NCV8501D33 requires a minimum input voltage of 3.9 V to maintain regulation at 150 mA, based on its maximum 600 mV dropout. At lighter loads, dropout falls to 100 mV, allowing regulation from as low as 3.4 V. Input must remain ≥7.3 V for guaranteed RESET function operation per datasheet specifications.

How does the FLAG pin function in NCV8501D33, and what external components are needed?

The FLAG pin in NCV8501D33 is an open-collector output that goes low when the MON pin voltage drops below its 1.20 V threshold. To use it, connect MON to a resistor divider from VOUT to set the warning point (e.g., 3.3 V → 1.2 V at MON), and add a pull-up resistor (typically 10 kΩ) on FLAG for CMOS-compatible signaling. No additional ICs are required.

Can NCV8501D33 be used in non-automotive applications, and what derating applies?

Yes, NCV8501D33 is fully functional in industrial and medical applications. Its NCV prefix denotes automotive qualification, but all electrical specs (−40 °C to +150 °C operation, 60 V transient rating) apply universally. No derating is needed - the device's robustness benefits any demanding environment, though cost may favor non-NCV alternatives where AEC-Q100 is unnecessary.

What is the purpose of the DELAY pin on NCV8501D33, and how is delay time calculated?

The DELAY pin on NCV8501D33 sources a constant 2.5 µA current to charge an external capacitor, setting the time between VOUT reaching regulation and RESET deassertion. Delay time is calculated as t_DELAY = C_DELAY × (V_DT − V_{RESET_LOW}) / I_CHARGE, where V_DT = 1.8 V typical and V_{RESET_LOW} ≈ 0 V. For example, 33 nF yields ~23.8 ms delay.

Is NCV8501D33 pin-compatible with other members of the NCV8501 family, such as the adjustable version?

No, NCV8501D33 is not pin-compatible with the adjustable NCV8501DADJ variants. Fixed-output versions (e.g., NCV8501D33) use Pin 4 as DELAY, while adjustable versions use Pin 4 as VADJ. The pin functions differ per configuration - refer to pages 6–7 of the datasheet for exact SO-8 mappings. PCB layout must match the specific variant ordered.