onsemi NCV8505D2T50R4

Overview

NCV8505D2T50R4 from onsemi is a 5.0 V, 400 mA automotive-grade LDO linear regulator with ENABLE, active RESET (functional down to 1.0 V), and programmable delay timing. It features ±2.0% output accuracy, 0.6 V dropout at full load, and <1.0 µA sleep current-designed for battery-powered microprocessor systems requiring robust fault protection and AEC-Q100 compliance.

For engineers reviewing the NCV8505D2T50R4 datasheet, pinout, applications, or equivalent options, key selection criteria include its 5.0 V fixed output, D2PAK-7 package with thermal pad, RESET threshold hysteresis of 50 mV, +60 V load dump tolerance, and −15 V reverse battery immunity-critical for automotive power rail supervision and ECU power management.

Technical Context

The NCV8505D2T50R4 integrates a precision bandgap reference (1.8 V for fixed versions), error amplifier, current-limit and thermal shutdown circuitry, and an independent low-voltage detection block for RESET generation. Its ENABLE input supports direct battery tie with internal pull-down and withstands load dump transients up to +60 V.

The RESET function operates as an open-collector NPN output with threshold hysteresis (4.70 V/4.60 V for 5.0 V option) and remains valid down to VOUT = 1.0 V. The DELAY pin sources 4.0 µA typical current to charge an external capacitor, enabling user-programmable reset delay timing without external logic.

Key Specifications

Pinout & Package

D2PAK-7 (Case 936AB) package with exposed thermal pad (Tab = GND); Pb-free, RoHS-compliant, AEC-Q100 qualified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV73350PDBVR and TPS7B8750QKVURQ1, the NCV8505D2T50R4 uniquely combines AEC-Q100 qualification, programmable reset delay, sub-1 µA sleep current, and −15 V reverse-battery tolerance in a thermally enhanced D2PAK-7 package-making it the only choice for cost-sensitive, high-reliability automotive power supervision where external component count must be minimized.

Availability

NCV8505D2T50R4 is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera ECUs, and infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for NCV8505D2T50R4 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCV8505 series belongs to onsemi's automotive power management portfolio, engineered specifically for AEC-Q100-compliant voltage regulation and system supervision in harsh-temperature, high-transient automotive environments.

FAQ

What is the minimum input voltage required for NCV8505D2T50R4 to regulate at 5.0 V?

The NCV8505D2T50R4 requires a minimum input voltage of 6.0 V to maintain regulation at its 5.0 V output, as specified in the Electrical Characteristics table for the 5.0 V option. Below this, the device enters dropout and output voltage drops linearly with input. This 6.0 V minimum ensures sufficient headroom for the 600 mV maximum dropout at 400 mA load while maintaining ±2.0% accuracy. The NCV8505D2T50R4 datasheet confirms this value under "Line Regulation (5.0 V Option)" test conditions.

Does NCV8505D2T50R4 support remote voltage sensing?

Yes, the NCV8505D2T50R4 supports remote voltage sensing via its dedicated SENSE pin (Pin 5). When used, SENSE connects directly to the load-side of the output trace to compensate for IR drop in PCB traces or connectors. If remote sensing is not required, SENSE must be connected to VOUT (Pin 6) per the datasheet's Fixed Output Pin Description. This Kelvin connection improves load regulation to ±0.5% typical, critical for precision 5 V MCU supplies.

What is the purpose of the DELAY pin on NCV8505D2T50R4, and how is delay time calculated?

The DELAY pin on NCV8505D2T50R4 sources a constant 4.0 µA (typical) current to charge an external capacitor, generating a programmable reset delay. Delay time is calculated as t_DELAY = C_DELAY × (V_DT − V_{DELAY_LOW}) / I_CHARGE, where V_DT = 2.2 V (max) switching threshold and V_{DELAY_LOW} ≈ 0.2 V. For example, a 33 nF capacitor yields ~14 ms delay. This eliminates external timers and provides precise, temperature-stable reset hold-off timing for microprocessor initialization sequences.

Is NCV8505D2T50R4 pin-compatible with other members of the NCV8505 family?

No, the NCV8505D2T50R4 is not pin-compatible with adjustable-output variants like NCV8505D2TADJR4G. While both use the D2PAK-7 package and share identical pin numbering, Pin 5 is SENSE on the fixed 5.0 V NCV8505D2T50R4 but VADJ (voltage adjust) on adjustable versions. Swapping them without circuit modification will cause regulation failure. The datasheet explicitly separates "Fixed Output" and "Adjustable Output" pin descriptions, confirming functional incompatibility at the pin level.

How does NCV8505D2T50R4 handle reverse battery conditions?

The NCV8505D2T50R4 is rated for −15 V reverse battery protection on the VIN pin, meaning it withstands full polarity reversal of the vehicle battery without damage or latch-up. This protection is implemented internally via integrated reverse-current blocking circuitry, eliminating the need for external series diodes or MOSFETs. The datasheet confirms this under "Maximum Ratings" and lists it among fault protections, making NCV8505D2T50R4 suitable for service-prone automotive applications where battery terminals may be misconnected.