LMV841MGX/NOPB - 4.5MHz RRIO CMOS Op-Amp, SC-70-5 | TI
N.º da peça: LMV841MGX/NOPB ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $1.85 | $1,85 |
| 10 | $1.62 | $16,20 |
| 100 | $1.32 | $132,00 |
| 500 | $1.05 | $525,00 |
| 1.000 | $0.92 | $920,00 |
| 3.000 | $0.78 | $2.340,00 |
LMV841MGX/NOPB Visão geral
A CMOS-input op-amp (operational amplifier) is a linear amplifier whose input stage is built using CMOS transistors rather than bipolar junction transistors. CMOS inputs provide extremely high input impedance (very low bias current), making them ideal for interfacing with high-impedance sensors such as photodiodes, electrochemical cells, and piezoelectric transducers. Rail-to-rail input and output (RRIO) capability allows the input common-mode signal and the output swing to reach within millivolts of both supply rails, maximizing dynamic range when operating from low-voltage supplies. These characteristics position the LMV841 within the broader hierarchy of operational amplifier -> amplifier IC -> analog signal chain -> integrated circuit.
Key features include a 4.5 MHz gain-bandwidth product, low input bias current due to the CMOS input stage, rail-to-rail input and output swing, low supply current consumption for battery operation, and operation from 2.7 V to 12 V single supply. The CMOS input stage virtually eliminates input bias current errors that would otherwise limit high-impedance sensor designs, while the RRIO capability preserves dynamic range in low-voltage single-supply systems. The 5-pin SC-70 package measures only 2.0 mm x 1.25 mm, enabling high-density analog front-end designs.
Typical applications include battery-powered instrumentation, photodiode transimpedance amplifiers, handheld medical devices, sensor signal conditioning, active filters, and portable audio signal chains. The wide supply range allows direct interfacing to lithium-ion cells (3.6 V nominal, 4.2 V peak) as well as 9 V industrial rails without level shifting.
When designing with the LMV841, place a 0.1 uF decoupling capacitor within 5 mm of the supply pin to minimize noise coupling. Avoid placing large resistive loads directly at the output when operating near the rails, as the output drive capability degrades within approximately 50 mV of either rail under heavy loading.
This page consolidates distributor stock and pricing data, drop-in alternative part numbers in the same SC-70-5 footprint, and practical SC-70 PCB layout guidance that augments the manufacturer datasheet for accelerated component selection.
Alternativas drop-in para LMV841MGX/NOPB — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com LMV841MGX/NOPB (mesmo formato e footprint) — diferindo em Number of Channels, Operating Temperature Range, Package, MSL Level, Amplifier Type.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
LMV841MG/NOPB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LMV841MGX
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LMV842MG/NOPB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LMV841MGX/NOPB Classificações máximas e características elétricas
| Amplifier Type | General Purpose Operational Amplifier |
| Number of Channels | 1 (Single) |
| Supply Voltage Range | 2.7 V to 12 V (single supply) |
| Input Type | CMOS (rail-to-rail) |
| Tipo de saída | Rail-to-Rail |
| Gain-Bandwidth Product | 4.5 MHz |
| Input Bias Current | CMOS - low bias current |
| Corrente de alimentação | Low power (per channel) |
| Faixa de temperatura de operação | -40 C to +125 C |
| Encapsulamento | 5-pin SOT-SC70 (DCK) |
| Package Size | 2.0 mm x 1.25 mm |
| Tipo de montagem | Surface Mount |
| Nível MSL | 1 (per JEDEC J-STD-020) |
| Status RoHS | Compliant |
| Lead-Free | Yes (NOPB suffix indicates Pb-free) |
Configuração de pinos do LMV841MGX/NOPB
| Pino 1 | OUT — Amplifier output |
| Pino 2 | V- — Negative supply (GND for single-supply operation) |
| Pino 3 | IN+ — Non-inverting input (CMOS, rail-to-rail) |
| Pino 4 | IN- — Inverting input (CMOS, rail-to-rail) |
| Pino 5 | V+ — Positive supply (2.7 V to 12 V) |
Aplicações típicas
LMV841MGX/NOPB é adequado para 6 aplicaçãos: Photodiode Transimpedance Amplifier, Battery-Powered Sensor Signal Conditioning, Portable Medical and Wearable Devices, Active Filter Circuit (Sallen-Key Topology), Industrial Process Control Signal Conditioning, Automotive Sensor Interface (Non-Safety).
Photodiode Transimpedance Amplifier
The LMV841MGX/NOPB's CMOS input stage delivers picoampere-level input bias current, which is essential for transimpedance amplifiers (TIAs) that convert photodiode current to voltage. Photodiode output impedance is extremely high (often GOhm), so any appreciable input bias current would create large offset errors. The 4.5 MHz GBW supports pulse-rate optical sensors and low-light measurement circuits. Placed in a standard inverting TIA topology with a 100 kohm to 10 Mohm feedback resistor, the device provides stable gain across the audio band without the bias-current drift that bipolar-input op-amps exhibit with temperature. Unlike lower-cost CMOS parts with limited supply range, the 12 V max supply allows direct biasing of high-voltage photodiodes in scientific instrumentation.
Recomendado
Battery-Powered Sensor Signal Conditioning
The LMV841MGX/NOPB operates directly from a single lithium-ion cell (3.0 V to 4.2 V) thanks to its 2.7 V to 12 V supply range, eliminating the need for a boost converter in many sensor signal chains. Low supply current preserves battery life in IoT sensor nodes, while the CMOS input stage presents negligible load to high-impedance sensors such as electrochemical gas sensors, pH probes, and humidity sensors. A typical application circuit uses the op-amp as a non-inverting buffer or fixed-gain amplifier (gain 1-10) between the sensor and an ADC. RRIO capability preserves dynamic range when the sensor output swings near either rail, which is common when the cell voltage approaches cutoff.
Recomendado
Portable Medical and Wearable Devices
The ultra-small 5-pin SOT-SC70 package (2.0 mm x 1.25 mm) and low power consumption make the LMV841MGX/NOPB ideal for wearable medical electronics such as hearing aids, continuous glucose monitors (CGMs), pulse oximeters, and ECG patches. CMOS inputs allow direct connection to bioelectric electrodes (skin-electrode interface) where source impedance can exceed 10 kohm due to skin resistance. The RRIO capability preserves the full dynamic range of low-amplitude biosignals (typically 0.1 mV to 5 mV). Operating from a single 3 V coin cell or rechargeable Li-Po, the device adds negligible quiescent current, extending wearable runtime by days compared to higher-Iq alternatives.
Recomendado
Active Filter Circuit (Sallen-Key Topology)
The LMV841MGX/NOPB's 4.5 MHz gain-bandwidth product comfortably supports active filter designs up to approximately 100 kHz, making it well-suited for Sallen-Key low-pass and high-pass filters in audio and sensor signal conditioning. RRIO output swing ensures the filter can pass signals approaching the supply rails without distortion, which is critical when filtering low-voltage sensor outputs. A typical 2nd-order Sallen-Key low-pass with fc = 20 kHz uses the LMV841 with two external resistors and two capacitors; the same op-amp unity-gain bandwidth is more than 100x the filter cutoff, ensuring filter response is dominated by the passive components and not the op-amp's open-loop gain roll-off.
Recomendado
Industrial Process Control Signal Conditioning
The wide 2.7 V to 12 V supply range and -40 C to +125 C operating temperature make the LMV841MGX/NOPB suitable for industrial process control loops where 4-20 mA current loops and 0-10 V signal standards are common. CMOS inputs interface cleanly with high-impedance bridge sensors (strain gauges, load cells) and RTD-derived signals. RRIO output allows direct driving of 0-10 V analog outputs without an additional buffer stage. The SC-70-5 package is small enough to fit on dense PLC analog input modules, while the industrial temperature grade ensures operation in unconditioned factory cabinets.
Recomendado
Automotive Sensor Interface (Non-Safety)
Although the LMV841MGX/NOPB is not AEC-Q100 qualified, designers use it in non-safety automotive applications such as interior cabin sensors, climate control feedback, and infotainment audio inputs. The 12 V supply tolerance accommodates load-dump transients (when paired with appropriate input protection), and the CMOS input bias current is low enough for the high-impedance sensors used in body electronics. For AEC-Q100 safety-critical applications, designers should select a different qualified part; the LMV841 family is best reserved for body and convenience electronics where non-automotive grade is acceptable.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LMV841MGX/NOPB — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LMV841MG/NOPB | LMV841MGX | LMV842MG/NOPB |
|---|---|---|---|---|
| Package | SOT-SC70-5 (DCK) 2.0x1.25 mm | SOT-SC70-5 (DCK) 2.0x1.25 mm - same | SOT-SC70-5 (DCK) 2.0x1.25 mm - same | SOT-SC70-5 (DCK) reference, dual in VSSOP-8 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Channels | 1 (Single) | 1 (Single) | 1 (Single) | 2 (Dual, VSSOP-8) |
| Supply Voltage Range | 2.7 V to 12 V | 2.7 V to 12 V | 2.7 V to 12 V | 2.7 V to 12 V |
| Gain-Bandwidth Product | 4.5 MHz | 4.5 MHz | 4.5 MHz | 4.5 MHz |
| Input Type | CMOS (RRIO) | CMOS (RRIO) | CMOS (RRIO) | CMOS (RRIO) |
| Output Type | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail |
| Lead-Free / RoHS | Yes (NOPB suffix) | Yes (NOPB suffix) | Yes (NOPB suffix not on label) | Yes (NOPB suffix) |
Principais diferenciais
- Smallest package option for LMV841 family in lead-free NOPB tape-and-reel orientation (vs LMV841MG/NOPB)
- Single-channel SC-70-5 minimizes PCB area vs dual/quad alternatives (vs LMV842MG/NOPB)
- Wide 2.7 V to 12 V supply supports both lithium-ion and 9 V industrial rails (vs MCP6L01 (Microchip))
Notas de projeto
Place a 0.1 uF X7R ceramic decoupling capacitor within 5 mm of the V+ pin (pin 5), with the trace to V+ kept short and wide to minimize supply inductance. For the SC-70-5 package, use a 0402 or 0201 decoupling cap on the supply side of the IC, and route the ground return directly to a low-impedance ground plane. If the application requires very low frequency noise filtering (sub-10 Hz), add a 10 uF bulk capacitor near the supply rail. Estimated: the SC-70-5 thermal resistance theta_JA is approximately 300 C/W; at 5 V supply and 1 mA quiescent, power dissipation is 5 mW and junction rise is negligible.
Keep input traces short and guarded with a ground trace on both sides to minimize leakage and stray capacitance, especially when the LMV841MGX/NOPB is used as a transimpedance or high-impedance buffer. Route the OUT pin trace away from the IN+/IN- pins to avoid parasitic feedback that can cause oscillation or peaking. Use a star-ground topology where the op-amp ground pin (pin 2) connects directly to the analog ground plane rather than daisy-chaining through other components.
The CMOS input stage is susceptible to ESD; place a series resistor (1 kohm or less) at each input if the source impedance is high (>100 kohm) to limit input current during ESD events. Avoid operating the inputs above the absolute maximum input voltage range (typically V- - 0.3 V to V+ + 0.3 V); clamp to the rails with Schottky diodes if over-voltage is possible. Estimated: the input capacitance of the CMOS input stage is approximately 5-10 pF, so for source impedances above 1 Mohm, the pole formed with input capacitance can limit bandwidth; place a feedback capacitor across the feedback resistor to compensate if oscillation occurs.
Do not assume the CMOS input provides zero bias current - while much lower than bipolar inputs, CMOS bias current is temperature-dependent and can reach nanoampere levels at 125 C. Do not load the output with less than 2 kohm to ground when operating near the rails, as RRIO output stages have reduced drive capability within 50-100 mV of either rail under heavy load. Do not forget the negative supply pin (pin 2) must be connected to ground in single-supply operation; floating this pin will cause undefined operation.
Informações de conformidade
RoHS and REACH compliant per TI product page. NOPB suffix indicates Pb-free lead finish. The LMV841 family is NOT AEC-Q100 qualified; choose a Q1-suffix part for automotive safety-critical applications.
