Texas Instruments LP3470A308DBVR

Overview

LP3470A308DBVR from Texas Instruments is a micropower voltage supervisor IC designed for precise power-on reset and brownout detection in microprocessor systems. It features a factory-programmed 3.08 V reset threshold (VIT−), ±1% accuracy over temperature, 0.3 µA typical quiescent current, open-drain active-low RESET output, and programmable reset delay via external capacitor on SRT pin. It operates from 0.95 V to 10 V and ensures reliable reset assertion down to VCC = 0.95 V.

For engineers reviewing the LP3470A308DBVR datasheet, LP3470A308DBVR pinout, LP3470A308DBVR application, or LP3470A308DBVR equivalent, this page delivers verified specifications, functional context, package details, real-world use cases, and validated alternative options - all grounded in TI's production-grade documentation for industrial and battery-powered embedded designs.

Technical Context

The LP3470A308DBVR implements a precision bandgap-based voltage reference with hysteresis (200 mV typical) to prevent oscillation during supply ramping. Its internal comparator continuously monitors VCC against the fixed 3.08 V threshold, asserting RESET low when VCC falls below VIT− and holding it low for a user-defined time (50 µs to 6.2 s) after VCC recovers above VIT+ (3.28 V).

Reset timing is governed by an internal 500 kΩ SRT pin resistance and externally connected capacitor (CSRT), enabling predictable delay calculation per tD ≈ 619 × CSRT (ms, with CSRT in µF). The device remains functional across −40°C to +125°C and exhibits immunity to short VCC transients up to 10 µs at 5% overdrive.

Key Specifications

Pinout & Package

SOT-23 (DBV) 5-pin package, 1.60 mm × 2.90 mm body size, surface-mount, RoHS-compliant, 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 TPS3808G30DBVR and MAX6326UT308+T, the LP3470A308DBVR uniquely combines nano-power operation (0.3 µA), factory-trimmed 3.08 V threshold, and fully programmable reset timing - making it optimal for long-life, field-deployed embedded systems requiring both precision and adaptability.

Availability

LP3470A308DBVR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart building controllers, portable medical monitors, and factory automation I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LP3470A308DBVR 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 company delivering analog and embedded processing solutions, with leadership in power management, signal chain, and high-reliability ICs for industrial, automotive, and consumer markets.

The LP3470A308DBVR belongs to TI's LP3470A family of ultra-low-power voltage supervisors, engineered specifically for reliable power-monitoring in battery-constrained and thermally demanding embedded systems where precision, longevity, and design flexibility are critical.

FAQ

What is the exact reset threshold voltage of the LP3470A308DBVR?

The LP3470A308DBVR has a factory-programmed negative-going input threshold (VIT−) of 3.08 V, with ±1% typical accuracy across −40°C to +125°C. This value is laser-trimmed during production and documented in TI's Electrical Characteristics table under "VIT− Negative-going input threshold accuracy." The corresponding positive-going threshold (VIT+) is 3.28 V due to 200 mV hysteresis.

How do I calculate the reset delay time for LP3470A308DBVR using an external capacitor?

For LP3470A308DBVR, reset delay (tD) is calculated as tD ≈ 619 × CSRT (in µF), yielding milliseconds. For example, a 100 nF capacitor gives ~61.9 ms delay. The formula derives from internal SRT pin resistance (500 kΩ typ) and is validated in TI's datasheet Figure 7 and Equation 2. Always confirm timing with actual hardware due to capacitor tolerance and temperature drift.

Can LP3470A308DBVR operate with a supply voltage below 3.08 V?

Yes - LP3470A308DBVR remains fully functional and asserts a valid RESET signal down to VCC = 0.95 V. Its internal circuitry operates independently of the 3.08 V threshold; the 0.95 V minimum ensures reliable reset assertion during deep brownout conditions, such as MCU wake-up from hibernate mode or battery end-of-life scenarios.

What is the purpose of the VCC1 pin on LP3470A308DBVR?

The VCC1 pin on LP3470A308DBVR is an optional auxiliary supply connection. It may be left floating or tied to VCC, but must never be connected to GND. TI documentation states it has no functional impact when unused and draws no current - its inclusion supports legacy compatibility and potential future variants, not active circuitry in the LP3470A308DBVR.

Is LP3470A308DBVR pin-compatible with the original LP3470?

Yes - LP3470A308DBVR is explicitly stated as pin-to-pin compatible with the LP3470 in TI's datasheet Features section. Both use identical SOT-23-5 (DBV) packaging, matching pinout (SRT, GND, VCC1, VCC, RESET), and share the same footprint, thermal profile, and PCB layout requirements - enabling drop-in replacement without redesign.