Texas Instruments LMV821DBVT

Overview

LMV821DBVT from Texas Instruments is a single-channel, rail-to-rail output operational amplifier optimized for low-voltage (2.5 V to 5.5 V), low-power applications. It delivers 5.5 MHz gain bandwidth, 1.9 V/μs slew rate, and 0.4 mA typical supply current at 5 V - enabling precision signal conditioning in space-constrained portable electronics such as cordless phones and PDAs.

For engineers reviewing the LMV821DBVT datasheet, LMV821DBVT pinout, LMV821DBVT application, or LMV821DBVT equivalent, key selection criteria include its SOT-23-5 package footprint, –40°C to 85°C operating range, rail-to-rail output swing down to 0.17 V from VCC+ and 0.1 V from GND at 5 V/2 kΩ, and absence of crossover distortion in audio and sensor front-end designs.

Technical Context

The LMV821DBVT employs a CMOS input stage with rail-to-rail output stage, supporting input common-mode voltage range extending 0.3 V below GND and up to 4.3 V at 5 V supply. Its internal compensation ensures stable unity-gain operation with ≥64.2° phase margin into 600 Ω loads.

Designed for single-supply operation, it achieves 95–105 dB large-signal voltage amplification and 72–90 dB CMRR across –40°C to 85°C, with input bias current ≤100 nA and input offset voltage ≤4 mV over temperature - making it suitable for high-impedance sensor interfaces and battery-powered instrumentation.

Key Specifications

Pinout & Package

SOT-23-5 package (DBV) with 5-pin surface-mount footprint, 2.9 mm × 1.6 mm body size, and 0.95 mm maximum height - compatible with standard pick-and-place and reflow processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar operational amplifier applications.

Compared with LMV321DBVR, LMV821DBVT provides 5.5× higher bandwidth and better output drive capability; compared with TLV9001IDBVR, it offers lower cost and broader legacy design support but lacks automotive qualification and has higher quiescent current.

Availability

LMV821DBVT is available at Aetrix Electronics and suitable for portable audio preamplifiers, medical sensor signal chains, industrial temperature monitors, smart home motion detectors, and battery-powered instrumentation requiring stable component supply and long-term obsolescence management.

Supply support for LMV821DBVT 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The LMV8xx family was designed specifically for low-voltage, low-power, space-constrained applications - emphasizing rail-to-rail output swing, minimal supply current, and compatibility with modern 3.3 V and 5 V digital systems.

FAQ

Is LMV821DBVT still recommended for new designs?

No - Texas Instruments explicitly marks LMV821DBVT as "Not Recommended for New Designs" in its official documentation. While fully functional and supported for existing production, designers should evaluate newer alternatives like TLV9001 or LPV821 for improved specs, longevity, and qualification status. LMV821DBVT remains available through Aetrix Electronics for legacy program continuity.

What is the maximum load capacitance LMV821DBVT can drive without instability?

LMV821DBVT is internally compensated for unity-gain stability with capacitive loads ≤22 pF when driving 600 Ω or higher resistive loads. Driving >100 pF requires external isolation resistor (≥100 Ω) in series with the output to maintain ≥60° phase margin - verified in TI's SLOS434I datasheet Figure 18–21 under varying CL and RL conditions.

Does LMV821DBVT support dual-supply operation?

Yes - LMV821DBVT operates with split supplies (e.g., ±2.5 V) as confirmed by its absolute maximum rating of ±VCC differential input voltage and typical characteristics tested at ±2.5 V in the datasheet. However, its input common-mode range extends only to VCC− – 0.3 V, so negative rail must remain ≥ –0.3 V for guaranteed input functionality.

What is the output short-circuit current limit of LMV821DBVT?

LMV821DBVT does not include internal short-circuit protection. Under sustained output short to GND at TA = 25°C and VCC ≤ 5.5 V, the device permits unlimited duration per datasheet Absolute Maximum Ratings - but actual safe current is limited by thermal dissipation: continuous output current must stay below ~25 mA to avoid junction temperature exceeding 150°C in SOT-23-5 package.

Can LMV821DBVT replace LMV321DBVR in an existing PCB layout?

Yes - LMV821DBVT and LMV321DBVR share identical SOT-23-5 (DBV) package, pinout, and footprint. No PCB changes are required for drop-in replacement. However, designers must verify that the higher 5.5 MHz bandwidth and 1.9 V/μs slew rate do not induce unexpected oscillation in marginally stable feedback networks originally tuned for LMV321's 1 MHz GBW.