Texas Instruments LP3470M5X-4.00/NOPB

Overview

LP3470M5X-4.00/NOPB from Texas Instruments is a micropower voltage supervisor IC with 4.00 V ±1% reset threshold, programmable reset time-out via external capacitor (t_RP = 2000 × C₁), open-drain active-low reset output, and operation down to V_CC = 0.5 V. It monitors microprocessor power rails in battery-powered systems to ensure reliable power-on-reset and brownout protection.

For engineers reviewing the LP3470M5X-4.00/NOPB datasheet, LP3470M5X-4.00/NOPB pinout, LP3470M5X-4.00/NOPB application, or LP3470M5X-4.00/NOPB equivalent, key selection criteria include reset threshold accuracy over temperature, quiescent current (16 µA typical), immunity to V_CC transients, SOT-23-5 package compatibility, and external capacitor-based timing flexibility.

Technical Context

The LP3470M5X-4.00/NOPB implements a precision bandgap reference and comparator architecture to achieve ±1% reset threshold accuracy across –20°C to 85°C. Its internal hysteresis (15–65 mV) prevents chatter during threshold crossing, and the open-drain Reset output requires an external pullup resistor (0.68–68 kΩ).

Reset assertion is triggered when V_CC falls below 4.00 V, and the reset pulse width is fully programmable via capacitor on SRT pin (e.g., 1 nF → 2 ms). The device remains functional down to V_CC = 0.5 V, enabling supervision during deep brownout conditions.

Key Specifications

Pinout & Package

LP3470M5X-4.00/NOPB is housed in a 5-pin SOT-23 (DBV) package with 1.60 mm × 2.90 mm body size, RoHS-compliant matte tin lead finish, and moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with LP3470M5X-4.00/NOPB, TPS3808G33DBVR offers lower quiescent current but lacks threshold and timing adjustability, while MAX6326UT40D3+ provides wider temperature range and push-pull output but removes programmable delay-making LP3470M5X-4.00/NOPB optimal where field-configurable reset timing and 4.00 V precision are essential.

Availability

LP3470M5X-4.00/NOPB is available at Aetrix Electronics and suitable for microprocessor power monitoring, portable medical devices, industrial PLC I/O modules, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for LP3470M5X-4.00/NOPB 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

Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with over 90 years of innovation in power management, signal chain, and control technologies.

The LP3470 family was designed specifically for cost-sensitive, space-constrained applications requiring high-accuracy, low-power voltage supervision-targeting portable electronics, industrial controls, and battery-backed instrumentation.

FAQ

What is the exact reset threshold voltage of the LP3470M5X-4.00/NOPB?

The LP3470M5X-4.00/NOPB has a factory-programmed reset threshold of 4.00 V with ±1% accuracy over the operating temperature range of –20°C to 85°C. This value is specified in the Electrical Characteristics table (VRTH parameter) and confirmed in the Mechanical, Packaging, and Orderable Information section of the datasheet.

How do I calculate the reset time-out period for the LP3470M5X-4.00/NOPB?

The reset time-out period (t_RP) for LP3470M5X-4.00/NOPB is calculated using t_RP (ms) = 2000 × C₁, where C₁ is the capacitance (in µF) connected between the SRT pin and ground. For example, a 100 nF capacitor yields t_RP = 200 ms. No capacitor (SRT floating) results in minimum delay.

What is the minimum supply voltage at which the LP3470M5X-4.00/NOPB guarantees reset assertion?

The LP3470M5X-4.00/NOPB guarantees valid reset output down to V_CC = 0.5 V, as stated in both the Recommended Operating Conditions and Electrical Characteristics sections. Below this voltage, reset behavior is not specified, but the device remains functional and asserts reset as long as V_CC stays below 4.00 V.

Does the LP3470M5X-4.00/NOPB require an external pullup resistor on the Reset pin?

Yes, the LP3470M5X-4.00/NOPB features an open-drain Reset output and requires an external pullup resistor (0.68 kΩ to 68 kΩ, typically 20 kΩ) connected between the Reset pin and V_CC or another logic rail. This is explicitly required per the Pin Functions description and Feature Description section.

Is the LP3470M5X-4.00/NOPB RoHS compliant and what is its moisture sensitivity level?

Yes, the LP3470M5X-4.00/NOPB is RoHS compliant (lead-free, matte tin finish) and rated at Moisture Sensitivity Level 1 (MSL-1) with unlimited floor life at ≤30°C/60% RH, per the Package Option Addendum. Peak reflow temperature is 260°C, consistent with standard Pb-free soldering profiles.