Texas Instruments LM321LVIDBVR

Overview

LM321LVIDBVR from Texas Instruments is a single-channel, low-voltage operational amplifier designed for cost-sensitive, battery-powered systems. It operates from 2.7 V to 5.5 V, delivers ±1 mV input offset voltage, 1 MHz unity-gain bandwidth, 40 nV/√Hz input voltage noise density, and consumes only 90 µA per channel. It is commonly used in low-side current sensing, environmental sensor signal conditioning, and cordless appliance front-end amplification.

For engineers reviewing the LM321LVIDBVR datasheet, LM321LVIDBVR pinout, LM321LVIDBVR application, or LM321LVIDBVR equivalent, this page provides verified technical context, package-specific pin functions, real-world design implications of key specs, and validated alternative options - all grounded in TI's SBOS944E production data sheet (Rev. E, Feb 2022).

Technical Context

The LM321LVIDBVR uses a P-channel input differential pair with parallel N-channel stage to eliminate phase reversal during overdrive while maintaining rail-to-rail common-mode input range down to V–. Its internal Class AB output stage supports stable unity-gain operation and achieves 1.5 V/µs slew rate with 1 µs overload recovery time.

Designed for single-supply operation, it accepts input common-mode voltages from (V–) – 0.1 V to (V+) – 1 V across its full 2.7–5.5 V supply range and exhibits 84 dB DC CMRR at 2.7 V and 92 dB at 5.5 V over –40°C to 125°C.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 1.60 mm × 2.90 mm body, 0.95 mm max height, gull-wing leads, JEDEC MO-178AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV9001IDBVR and LM321M5X, LM321LVIDBVR uniquely balances 125°C operation, 2-kV HBM robustness, and sub-100-µA IQ in a qualified SOT-23-5 package - making it the preferred choice for industrial battery management and safety-critical sensor interfaces.

Availability

LM321LVIDBVR is available at Aetrix Electronics and suitable for low-power sensor signal conditioning, battery-powered appliance control, and industrial UPS monitoring requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LM321LVIDBVR 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 LM3xxLV family - including LM321LVIDBVR - was engineered specifically for cost-optimized, low-voltage systems requiring rail-to-rail input operation, robust ESD tolerance, and guaranteed performance from –40°C to 125°C.

FAQ

What is the maximum capacitive load the LM321LVIDBVR can drive while remaining stable?

The LM321LVIDBVR is unity-gain stable with capacitive loads up to 100 pF, as confirmed by Figure 6-23 and 6-24 in the SBOS944E datasheet. For loads exceeding 100 pF, TI recommends adding a series resistor (typically 10–50 Ω) between the output and the capacitor to maintain phase margin above 45° and prevent peaking or oscillation. This applies directly to LM321LVIDBVR in SOT-23-5 configuration.

Does the LM321LVIDBVR support true rail-to-rail output swing?

No - the LM321LVIDBVR features rail-to-rail *input* but not rail-to-rail output. Its output swings to within 40–75 mV of V– and 1 V of V+ under specified load conditions (RL ≥ 2 kΩ for high side, RL ≤ 10 kΩ for low side). This limitation is documented in Section 6.7 Electrical Characteristics under VOH and VOL parameters for LM321LVIDBVR.

Can the LM321LVIDBVR operate from a single 2.7-V supply?

Yes - the LM321LVIDBVR is fully specified for operation from 2.7 V to 5.5 V single supply, with all electrical characteristics (including input offset, CMRR, and PSRR) guaranteed across that range per Section 6.3 Recommended Operating Conditions. Its input common-mode range extends to V–, enabling ground-referenced sensor interfacing at 2.7 V, as confirmed for LM321LVIDBVR.

What is the thermal resistance (RθJA) of the LM321LVIDBVR in its SOT-23-5 package?

The junction-to-ambient thermal resistance (RθJA) for LM321LVIDBVR in the DBV (SOT-23-5) package is 232.9°C/W, as published in Table 6-4 Thermal Information of the SBOS944E datasheet. This value assumes standard JEDEC 2-layer board layout; actual thermal performance improves with copper pour and thermal vias.

Is the LM321LVIDBVR pin-compatible with legacy LM321 variants?

No - LM321LVIDBVR uses the standard 5-pin SOT-23 pinout (IN+, V–, IN–, OUT, V+), but differs electrically from older LM321 versions in supply range (2.7–5.5 V vs. ±1.5–±16 V), input structure (P-channel + N-channel input pair), and ESD rating (2 kV HBM vs. typically 1.5 kV). Direct replacement requires validation of biasing, gain, and stability in the target circuit.