Texas Instruments LPV321M7

Overview

LPV321M7 from Texas Instruments is a single-channel, micropower, rail-to-rail output operational amplifier optimized for low-voltage (2.7 V to 5 V), battery-powered applications. It delivers 152 kHz gain-bandwidth product, 9 µA supply current at 5 V, and rail-to-rail output swing (V+ −3.5 mV / V− +90 mV at 100 kΩ load) in a space-saving 5-pin SC70 package. It is used in portable sensor signal conditioning and low-power active filters.

For engineers reviewing the LPV321M7 datasheet, LPV321M7 pinout, LPV321M7 application, or LPV321M7 equivalent, key selection criteria include micropower consumption (<10 µA), rail-to-rail output capability under 100 kΩ load, input common-mode range extending to ground (−0.2 V to V+−0.8 V), and guaranteed operation across −40°C to 85°C industrial temperature range.

Technical Context

The LPV321M7 employs a bipolar input and output stage fabricated on TI's submicron BiCMOS process, enabling improved noise performance (146 nV/√Hz at 1 kHz, 5 V) and higher output current drive (±20 mA sinking/sourcing) versus CMOS-only micropower op amps. Its architecture supports stable unity-gain operation with up to 200 pF capacitive load without external compensation.

It operates from single-supply (2.7 V–5 V) or split-supply configurations, with input common-mode voltage range including ground and output swing within 3.5 mV of V+ and 90 mV of V−. DC precision includes 1.5 mV max input offset voltage (25°C, 5 V) and 50 dB min CMRR over 0 V to 4 V common-mode range.

Key Specifications

Pinout & Package

LPV321M7 is packaged in a 5-pin SC70 (2.00 mm × 1.25 mm) surface-mount package, offering ~50% board area reduction versus standard SOT-23. The compact footprint enables placement adjacent to sensors or connectors to minimize trace-induced noise pickup.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar general-purpose low-voltage op amp applications.

Compared with MCP6001T-E/OT and TSV611ILT, LPV321M7 offers the best balance of micropower (9 µA), usable bandwidth (152 kHz), rail-to-rail output drive, and bipolar-input noise performance - making it optimal for always-on, low-frequency analog signal chains where battery life and signal fidelity are both critical.

Availability

LPV321M7 is available at Aetrix Electronics and suitable for portable medical sensors, low-power active filters, industrial process transmitters, and smart home sensor hubs requiring stable component supply across long production lifecycles.

Supply support for LPV321M7 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 specializing in analog and embedded processing technologies, with leadership in precision amplifiers, power management, and signal chain solutions.

The LPV321M7 belongs to TI's LPV3xx-N micropower op amp family, designed specifically for cost-sensitive, space-constrained, battery-powered applications demanding rail-to-rail output, ground-sensing inputs, and guaranteed 2.7 V–5 V operation.

FAQ

What is the maximum capacitive load the LPV321M7 can drive without oscillation?

The LPV321M7 is specified to remain stable with up to 200 pF of capacitive load in unity-gain configuration, per TI's datasheet (SNOS413E, Section 7.4.1). This eliminates the need for external isolation resistors in many ADC driver and filter applications. For loads exceeding 200 pF, TI recommends using the resistive-isolation circuit shown in Figure 37 of the datasheet. The LPV321M7's internal compensation ensures robust phase margin even under these conditions.

Does the LPV321M7 support true single-supply operation with input signals at ground potential?

Yes, the LPV321M7 supports true single-supply operation with input common-mode voltage down to −0.2 V, allowing direct connection to ground-referenced sources such as resistive sensors or DAC outputs. Its input stage includes ground-sensing capability, and the output swings to within 90 mV of V− (GND) at 100 kΩ load. This makes LPV321M7 suitable for DC-coupled signal chains in 2.7 V–5 V systems without level-shifting circuitry.

What is the typical input voltage noise of the LPV321M7 and at what frequency is it measured?

The LPV321M7 exhibits a typical input-referred voltage noise of 146 nV/√Hz at 1 kHz under 5 V supply conditions, as specified in Section 6.8 of the datasheet. This value reflects its bipolar input architecture, which provides lower voltage noise than comparable CMOS-input micropower op amps. Noise remains relatively flat across the audio band (20 Hz–20 kHz), supporting high-fidelity low-level signal amplification in sensor front-ends.

Is the LPV321M7 pin-compatible with other members of the LPV3xx-N family?

No - the LPV321M7 (single-channel, 5-pin SC70) is not pin-compatible with LPV358-N (dual, 8-pin SOIC/VSSOP) or LPV324-N (quad, 14-pin SOIC/TSSOP). Each variant has distinct pin counts, functions, and footprints. However, all share identical electrical specifications and functional behavior per channel, enabling scalable design reuse across channel-count requirements when layout is adapted accordingly.

What is the recommended operating temperature range for the LPV321M7?

The LPV321M7 is rated for industrial operation from −40°C to +85°C ambient temperature, as confirmed in Section 6.3 (Recommended Operating Conditions) of the TI datasheet SNOS413E. All key parameters - including supply current, input offset voltage, gain-bandwidth product, and output swing - are guaranteed across this full range, making LPV321M7 suitable for deployment in automotive cabin modules, industrial controllers, and outdoor sensor enclosures.