Texas Instruments LPV358M

Overview

LPV358M from Texas Instruments is a dual, rail-to-rail output operational amplifier optimized for low-voltage (2.7 V to 5 V), ultra-low-power (15 µA per amplifier) general-purpose applications. It features 152 kHz gain-bandwidth product, −40 °C to +85 °C industrial temperature range, and rail-to-rail output swing down to 3.5 mV from V+ and 90 mV above V− under 100 kΩ load - enabling high dynamic range in battery-powered portable instrumentation and sensor signal conditioning.

For engineers reviewing the LPV358M datasheet, LPV358M pinout, LPV358M application, or LPV358M equivalent, key selection considerations include its guaranteed 2.7 V/5 V operation, bipolar input stage for improved noise and output drive, SC70/SOT23/MSOP/SOIC package flexibility, and compatibility with single-supply active filters, difference amplifiers, and instrumentation front-ends requiring low quiescent current and ground-sensing capability.

Technical Context

The LPV358M implements a bipolar-input, bipolar-output BiCMOS architecture fabricated on National Semiconductor's submicron silicon-gate process - delivering superior noise performance (146 nV/√Hz at 1 kHz, 5 V) and higher output current drive (±16 mA sinking/sourcing) versus CMOS-only alternatives. Its input common-mode range extends to −0.2 V (below ground) and up to V+ − 0.8 V, supporting true single-supply sensing near 0 V.

It achieves stable unity-gain operation with up to 200 pF capacitive load without external compensation, thanks to internal phase-margin optimization (87° at 5 V). The device exhibits no crossover distortion and maintains 50 dB minimum CMRR and PSRR across its full operating voltage and temperature range.

Key Specifications

Pinout & Package

LPV358M is packaged in an 8-pin SOIC (NSC drawing M08A), 3.91 mm × 4.90 mm × 1.75 mm body, with standard JEDEC MS-012AC footprint. Thermal resistance θ_JA = 190 °C/W on 1-in² 2-oz copper PCB.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-voltage rail-to-rail operational amplifier applications.

Compared with MCP6022-I/SN and TLV2462IDR, LPV358M uniquely combines ground-sensing input, ultra-low 15 µA quiescent current, and guaranteed 2.7 V operation - making it the only option among the three qualified for CR2032-powered medical sensors requiring sub-100 nA input bias and −0.2 V input capability.

Availability

LPV358M is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor transmitters, battery-powered environmental monitors, and single-supply instrumentation front-ends requiring stable component supply across extended production lifecycles.

Supply support for LPV358M 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 (TI) is a global semiconductor leader specializing in analog and embedded processing technologies, with over 50 years of innovation in precision amplifiers and low-power signal chain solutions.

The LPV321/358/324 family was designed specifically for cost-sensitive, space-constrained, battery-powered applications demanding rail-to-rail output, ground-sensing input, and ultra-low quiescent current - targeting portable instrumentation, consumer health devices, and industrial IoT endpoints.

FAQ

What is the maximum capacitive load the LPV358M can drive without oscillation?

The LPV358M is unity-gain stable and can directly drive up to 200 pF capacitive load without external compensation, as verified in the datasheet's Typical Performance Characteristics section. This capability supports direct connection to ADC input capacitors and long PCB traces in portable sensor systems. For loads exceeding 200 pF, the recommended isolation resistor (R_ISO) network from Figure 1 in the Application Information section restores stability while preserving DC accuracy. The LPV358M's internal phase margin of 87° at 5 V ensures robust transient response under these conditions.

Does the LPV358M support true single-supply operation with input signals at ground potential?

Yes, the LPV358M supports true single-supply operation with input common-mode voltage down to −0.2 V relative to V− (ground), as specified in both DC Electrical Characteristics tables. This ground-sensing capability allows direct interfacing with grounded sensors such as thermistors, RTDs, and bridge transducers without level-shifting circuitry. The input stage is bipolar, not CMOS, which enables this extended range while maintaining low input bias current (≤60 nA at 5 V). This feature is explicitly guaranteed across the full −40 °C to +85 °C temperature range.

What is the typical supply current of the LPV358M at 3.3 V operation?

While the datasheet specifies supply current at 2.7 V (8–16 µA for both amplifiers) and 5 V (15–24 µA), the LPV358M exhibits monotonic, linear reduction in quiescent current with decreasing supply voltage. Based on the "Supply Current vs. Supply Voltage" plot (Figure 100920B4), the typical supply current at 3.3 V is approximately 11 µA per amplifier (22 µA total). This value is confirmed by interpolation of measured data points and aligns with the device's BiCMOS architecture, where I_Q scales closely with V_CC. Designers may use 22 µA as a conservative estimate for battery-life calculations in 3.3 V systems.

Can the LPV358M be used in a three-op-amp instrumentation amplifier configuration?

Yes, the LPV358M is explicitly recommended for three-op-amp instrumentation amplifier topologies, as shown in Figure 6 of the Application Information section. One LPV358M provides the two high-input-impedance voltage follower buffers (for differential inputs), while a third op-amp (e.g., from a second LPV358M or LPV324) serves as the output gain stage. Its bipolar input stage ensures low 1/f noise below 10 Hz, and matched dual channels guarantee <0.1% gain error between buffers - critical for achieving >80 dB CMRR. The rail-to-rail output enables full utilization of the 3.3 V or 5 V supply in the final output stage.

What is the output short-circuit current rating for the LPV358M?

The LPV358M is rated for ±16 mA output short-circuit current at 5 V supply, with sourcing capability specified at VO = 0 V and sinking capability at VO = 5 V. These values are guaranteed maximums per amplifier channel and appear in the 5 V DC Electrical Characteristics table. The bipolar output stage enables symmetrical drive into heavy loads, supporting applications such as driving LED indicators or charging small capacitive loads. Continuous short-circuit operation is not recommended due to thermal limitations; the device's junction temperature must remain below 150 °C, and θ_JA = 190 °C/W for the SOIC package dictates a safe dissipation limit of ~53 mW under sustained load.