onsemi NCP4671DSN13T1G

Overview

NCP4671DSN13T1G from onsemi is a 400 mA dual-rail ultra-low dropout linear regulator with fixed 1.3 V output, designed for low-voltage power delivery in space-constrained portable systems. It features separate VBIAS and VIN inputs, 180 mV typical dropout at 400 mA, ±15 mV output accuracy at 25°C, and 28 µA quiescent current - enabling stable core voltage regulation for battery-powered microcontrollers and RF ICs.

For engineers reviewing the NCP4671DSN13T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its dual-rail architecture (VBIAS ≥ VOUT + 1.6 V), 0.9 V minimum VIN operation, auto-discharge capability, SOT-23-5 package footprint, and PSRR of 80 dB at 1 kHz on VIN ripple.

Technical Context

The NCP4671DSN13T1G implements a dual-rail CMOS LDO architecture where VBIAS powers the control circuitry independently from VIN, enabling ultra-low dropout and high PSRR. Its internal reference and error amplifier maintain tight regulation across −40°C to +85°C ambient temperature.

It integrates chip enable (CE) with active-high logic, internal current foldback protection (120 mA typ.), and an output discharger transistor (D-version feature). The device requires external 1 µF ceramic decoupling on both VIN and VBIAS, and 2.2 µF on VOUT for stability.

Key Specifications

Pinout & Package

SOT-23-5 package (Case 1212), 2.7 mm × 2.5 mm × 1.3 mm body, Pb-free, RoHS-compliant. Exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout linear regulator applications.

Compared with NCP4671DSN13T1G, the XC6210B132MR-G offers simpler integration but sacrifices PSRR and noise performance, while the AP2204K-13TRG1 provides basic regulation at lower cost but lacks critical features for battery-constrained, noise-sensitive applications.

Availability

NCP4671DSN13T1G is available at Aetrix Electronics and suitable for mobile baseband processors, wearable sensor hubs, and portable medical monitors requiring stable component supply with guaranteed long-term sourcing and traceable Pb-free compliance.

Supply support for NCP4671DSN13T1G 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, and sensing solutions for automotive, industrial, and portable electronics.

The NCP4671DSN13T1G belongs to the NCP4671 family of dual-rail LDOs engineered specifically for ultra-low-voltage, ultra-low-noise power delivery in battery-powered edge devices where headroom, PSRR, and standby current are critical.

FAQ

What is the minimum input voltage required for NCP4671DSN13T1G to regulate at 1.3 V?

The NCP4671DSN13T1G requires VIN ≥ VOUT + 0.1 V = 1.4 V when VOUT ≥ 0.8 V. However, stable operation also mandates VBIAS ≥ VOUT + 1.6 V = 2.9 V. Therefore, the effective minimum system input is determined by the VBIAS rail, not VIN alone. For example, with VBIAS = 3.3 V, VIN may be as low as 1.4 V while maintaining regulation.

Does NCP4671DSN13T1G support automatic output discharge during shutdown?

Yes, the "D" suffix in NCP4671DSN13T1G denotes the auto-discharge version. When CE is pulled low, an internal N-channel transistor connects VOUT to GND, actively discharging the output capacitor. This prevents residual voltage from interfering with downstream logic sequencing or causing latch-up in powered-off sections.

What are the recommended capacitor values for NCP4671DSN13T1G stability?

NCP4671DSN13T1G requires a minimum 1 µF X5R/X7R ceramic capacitor on both VIN and VBIAS pins, placed as close as possible to their respective pins and GND. A 2.2 µF or larger ceramic capacitor is required on VOUT. Tantalum capacitors are discouraged due to ESR-related instability risks.

Can NCP4671DSN13T1G operate with VBIAS and VIN supplied from the same source?

No - the NCP4671DSN13T1G's dual-rail architecture requires VBIAS ≥ VOUT + 1.6 V = 2.9 V, while VIN only needs to be ≥ 1.4 V. Using the same source violates the VBIAS > VIN condition and degrades PSRR and dropout performance. Best practice is to derive VBIAS from a higher-voltage rail (e.g., buck converter input) and VIN from its output.

What is the thermal performance of NCP4671DSN13T1G in SOT-23-5 package at full 400 mA load?

In the SOT-23-5 package, NCP4671DSN13T1G has R_JA = 238 °C/W. At 400 mA and 1.3 V output with VIN = 1.8 V (ΔV = 0.5 V), power dissipation is 200 mW. Junction temperature rise is ~47.6°C above ambient. With 25°C ambient, T_J ≈ 73°C - well within the 150°C maximum rating and safe for continuous operation on standard FR-4 PCBs.