My Inquiry
My Account
Texas Instruments LMV981MFX
- Part No.:
- LMV981MFX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
LMV981MFX.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,332
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMV981MFX from Texas Instruments is a single-channel, rail-to-rail input/output operational amplifier optimized for 1.8-V operation in space-constrained, battery-powered systems. It delivers 1.4-MHz gain-bandwidth product, 100-µA supply current per channel, 4-mV max input offset voltage, and output swing within 80 mV of rails under 600-Ω load - enabling precision signal conditioning in wearable health monitors and portable audio front-ends.
For engineers reviewing the LMV981MFX datasheet, LMV981MFX pinout, LMV981MFX application, or LMV981MFX equivalent, key selection criteria include its ultra-low quiescent current at 1.8 V, shutdown functionality with 19-µs turnon time, rail-to-rail input extending 200 mV beyond supplies, and compatibility with DSBGA/SC70/SOT-23 packages for flexible PCB layout in compact consumer electronics.
Technical Context
The LMV981MFX implements a CMOS input stage with rail-to-rail input common-mode range (V− −0.2 V to V+ +0.2 V at 25°C) and a push-pull output stage capable of driving 600-Ω loads while maintaining stability with up to 1000-pF capacitive loads. Its 1.4-MHz GBW and 0.35-V/µs slew rate are specified across 1.8–5-V supply range.
Shutdown is controlled by a dedicated SHDN pin that places the output in high-impedance state and reduces supply current to ≤1 µA. The device operates across −40°C to +125°C and supports both single-supply (e.g., 1.8 V) and split-supply configurations without performance degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8 V to 5 V - enables direct interface with single-cell Li-ion (3.0–4.2 V), two-cell alkaline (2.4–3.2 V), or low-voltage logic rails. |
| Gain-Bandwidth Product | 1.4 MHz - supports stable unity-gain buffer and closed-loop amplification up to ~100 kHz with phase margin ≥67°. |
| Supply Current (per channel) | 100 µA at 1.8 V - allows >1-year battery life in always-on sensor nodes powered by CR2032 coin cells. |
| Input Offset Voltage (max) | 4 mV at 25°C - ensures ≤0.2% gain error in 12-bit ADC front-end applications with 1-V full-scale input. |
| Output Swing (600 Ω load) | Within 80 mV of rails at 1.8 V - preserves dynamic range in low-voltage analog signal chains without level-shifting. |
| Turnon Time from Shutdown | 19 µs - enables rapid wake-up in duty-cycled power monitoring circuits without signal settling delay penalties. |
| Input Common-Mode Range | V− −0.2 V to V+ +0.2 V at 25°C - permits sensing below ground or above supply in single-supply battery monitor designs. |
Pinout & Package
LMV981MFX is available in SC70-6 (DCK) package (2.00 mm × 1.25 mm), with identical pinout to SOT-23-6 (DBV) and DSBGA-6 (YZR). All variants share the same functional pin mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN | Noninverting input | High-impedance CMOS node accepting signals from sensors or DAC outputs; supports rail-to-rail common-mode range. |
| −IN | Inverting input | Differential input node used in transimpedance, difference, or inverting amplifier configurations. |
| OUT | Amplifier output | Push-pull rail-to-rail output capable of sourcing/sinking ≥4 mA into 600-Ω load at 1.8 V. |
| SHDN | Active-high shutdown control | Logic-level input: device enabled when ≥1.9 V (at 2.7 V supply); pulls supply current to ≤1 µA when low. |
| V+ | Positive supply | Primary power rail; accepts 1.8–5 V; decoupling capacitor required within 1 cm for stability. |
| V− | Negative supply / ground | Reference node for single-supply operation; must be connected to system ground or negative rail. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input with 200-mV beyond-rail range | Enables accurate sensing of signals near or slightly outside supply rails - critical for battery voltage monitoring at end-of-discharge. |
| 100-µA quiescent current at 1.8 V | Reduces average power in always-on wearables to <200 nW per channel - extends CR2032 battery life beyond 3 years. |
| Stable with 1000-pF capacitive load | Eliminates need for isolation resistors when driving ADC inputs or long PCB traces - simplifies layout in compact PCBs. |
| 19-µs fast wake-up from shutdown | Supports microsecond-scale burst sampling in energy-harvesting sensor nodes without compromising measurement latency. |
| −40°C to +125°C operating range | Validates reliable operation in automotive cabin modules, industrial IoT edge nodes, and outdoor wearable environments. |
Applications
| Wearable Heart Rate Monitor | Battery Fuel Gauge Interface |
|---|---|
|
Use Scenario: Amplifying weak photoplethysmography (PPG) signals from optical heart rate sensors in smartwatches. IC Role / Device Role / Timing Role: Single-supply transimpedance amplifier converting photodiode current to voltage with rail-to-rail input to capture full LED pulse amplitude. Use Value: 100-µA supply current minimizes impact on battery runtime; 1.4-MHz GBW supports clean 100-Hz pulse waveform acquisition. |
Use Scenario: Conditioning voltage feedback from battery cell taps in multi-cell Li-ion packs for fuel gauge ICs. IC Role / Device Role / Timing Role: Precision buffer isolating high-impedance cell voltage dividers from fuel gauge ADC inputs. Use Value: 4-mV max VOS ensures ≤0.1% voltage measurement error; rail-to-rail input accommodates cell voltages down to 2.5 V. |
| Portable Audio Line Driver | Low-Power Sensor Signal Chain |
|
Use Scenario: Driving stereo headphone outputs in Bluetooth earbuds powered by 1.8-V LDO-regulated rail. IC Role / Device Role / Timing Role: Unity-gain rail-to-rail output buffer delivering low-distortion audio (<0.023% THD) into 16-Ω loads. Use Value: 80-mV rail proximity at 600-Ω load preserves headroom for 1-Vpp audio signals; shutdown mode cuts idle current to <1 µA. |
Use Scenario: Amplifying thermistor or RTD bridge outputs in battery-powered environmental sensors. IC Role / Device Role / Timing Role: Low-drift instrumentation amplifier front-end with 5.5-µV/°C TCVOS minimizing temperature-induced offset drift. Use Value: 200-mV beyond-rail input range captures full bridge differential swing even during cold-start conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP6001T-E/OT | Lower GBW (1 MHz), higher VOS (7 mV max), no shutdown pin, SC70-5 package (5-pin vs 6-pin). | Lacks shutdown control and rail-to-rail input beyond rails; unsuitable for ultra-low-power wake-up or sub-rail sensing. | Select when shutdown and extended input range are not required and board space allows rework for 5-pin footprint. |
| TLV9001IDBVR | Higher GBW (1 MHz), lower VOS (1.6 mV typ), shutdown pin, same SC70-6 footprint and pinout. | Superior DC precision but 2× higher supply current (200 µA); less optimal for multi-year battery life targets. | Prefer when offset-critical sensor interfaces dominate over quiescent power budget constraints. |
Compared with MCP6001T-E/OT, LMV981MFX provides essential shutdown control and 200-mV beyond-rail input for battery monitoring; versus TLV9001IDBVR, it halves supply current at the cost of 0.4-mV higher typical VOS - making LMV981MFX optimal for ultra-low-power, rail-flexible analog front-ends.
Availability
LMV981MFX is available at Aetrix Electronics and suitable for wearable electronics, battery management systems, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMV981MFX 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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision amplifiers and low-power signal chain solutions.
The LMV98x-N series was designed specifically for ultra-low-voltage, space-constrained applications including fitness trackers, hearing aids, and single-cell battery-powered instrumentation - prioritizing 1.8-V operation, rail-to-rail performance, and minimal quiescent power.
FAQ
What supply voltage range does the LMV981MFX support?
The LMV981MFX operates from 1.8 V to 5 V, with guaranteed specifications at 1.8 V, 2.7 V, and 5 V. This range supports direct connection to single-cell Li-ion batteries (3.0–4.2 V), two-cell alkaline sources (2.4–3.2 V), and low-voltage logic rails. Absolute maximum supply is 5.5 V, and operation below 1.8 V is not characterized or guaranteed.
Does the LMV981MFX have rail-to-rail input and output capability?
Yes, the LMV981MFX features true rail-to-rail input and output. Its input common-mode voltage extends 200 mV beyond the supply rails (V− −0.2 V to V+ +0.2 V at 25°C), and the output swings within 80 mV of each rail under 600-Ω load at 1.8 V. This enables full dynamic range utilization in single-supply systems without external level-shifting circuitry.
How does the shutdown function work on the LMV981MFX?
The LMV981MFX uses an active-high SHDN pin: the device operates normally when SHDN ≥1.9 V (at 2.7 V supply) and enters shutdown when SHDN ≤0.8 V. In shutdown, supply current drops to ≤1 µA and the output becomes high-impedance. Turnon time from shutdown is 19 µs at 1.8 V, enabling rapid wake-up in duty-cycled sensor applications.
What is the maximum capacitive load the LMV981MFX can drive stably?
The LMV981MFX is characterized for stable operation with up to 1000-pF capacitive loads without requiring external isolation resistors. This capability simplifies design in applications such as ADC input buffering or long-trace signal routing, where parasitic capacitance would otherwise cause peaking or oscillation in less robust amplifiers.
Is the LMV981MFX suitable for automotive applications?
Yes, the LMV981MFX is qualified for operation from −40°C to +125°C and meets automotive-grade reliability requirements per its datasheet specifications. It is commonly deployed in cabin ambient sensors, battery monitoring modules, and infotainment system audio interfaces where low power, small size, and rail-to-rail performance are critical.
LMV981MFX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.42V/µs
- Gain Bandwidth Product:
- 1.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 14 nA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 116µA
- Current - Output / Channel:
- 100 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
LMV981MFX FAQ
1.How can I place an order for LMV981MFX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV981MFX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LMV981MFX reliable?
The price and inventory of LMV981MFX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV981MFX is usually 5 days.
3.What payment methods are accepted for LMV981MFX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV981MFX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV981MFX?
LMV981MFX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV981MFX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LMV981MFX?
For technical support, including LMV981MFX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV981MFX requirements.
6.How does Aetrix verify that LMV981MFX is sourced from the original manufacturer or authorized distributors?
All LMV981MFX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMV981MFX meets industry standards.
7.What is the process for return or replacement of LMV981MFX?
All LMV981MFX units undergo pre-shipment inspection (PSI). If there is an issue with LMV981MFX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LMV981MFX part is unused and in its original packaging.
Return procedure for LMV981MFX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV981MFX Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
