LM321MF/NOPB - 1MHz, Single Op Amp, 3-32V, SOT-23-5 | TI
N.º de pieza: LM321MF/NOPB ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $0.51 | $0,51 |
| 10 | $0.43 | $4,30 |
| 100 | $0.31 | $31,00 |
| 500 | $0.24 | $120,00 |
| 1.000 | $0.19 | $190,00 |
LM321MF/NOPB Descripción general
An operational amplifier (op amp) is a high-gain DC-coupled electronic voltage amplifier with differential inputs and a single-ended output. Op amps belong to the amplifier IC family within integrated circuits, which also includes instrumentation amplifiers, comparators, and specialty audio/video amplifiers. The LM321MF/NOPB specifically is a general-purpose single op amp, meaning one amplifier channel per package; it sits in the hierarchy: op amp -> amplifier IC -> analog IC -> integrated circuit -> semiconductor.
Key features include 1 MHz gain-bandwidth product, 0.4 V/us slew rate, low input offset voltage (typical 2 mV), input common-mode range that includes the negative rail, and large capacitive-load drive capability. The bipolar input stage with class-AB output provides robust performance across the wide 3 V to 32 V supply range. Internal ESD protection and thermal shutdown enhance field reliability.
The LM321MF/NOPB uses a bipolar transistor input stage rather than CMOS or JFET, giving it inherently low noise voltage density but somewhat higher input bias current than modern CMOS alternatives. Its wide supply range allows direct connection to industrial 24 V rails, 12 V battery systems, or +/-15 V analog supplies, eliminating the need for additional level shifters. The 1 MHz bandwidth is sufficient for audio, sensor conditioning, and many active-filter topologies.
Typical applications include transducer signal conditioning, low-frequency active filters, current sensing with high-side or low-side shunt, audio pre-amplifier stages, and general-purpose amplification in industrial controls. The SOT-23-5 footprint is ideal for space-constrained PCB designs such as handheld instruments and IoT sensor modules.
When designing with the LM321MF/NOPB, verify input bias current (45 nA typical) is acceptable for high-impedance sensor interfaces. Place a 0.1 uF decoupling capacitor close to the VCC pin and ensure output capacitive loads stay within the datasheet's stability region to avoid oscillation.
This page synthesizes distributor pricing, drop-in SOT-23-5 alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a faster path from datasheet to prototype.
Alternativas directas para LM321MF/NOPB — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
LM321MFX/NOPB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LM321MF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LMV321MF/NOPB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TLV2371IDBVR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TLV9001IDCKR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MCP6001T-E/OT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LM321MF/NOPB Valores máximos y características eléctricas
| Amplifier Type | General Purpose Op Amp |
| Number of Channels | 1 (Single) |
| Gain Bandwidth Product | 1 MHz |
| Slew Rate | 0.4 V/us |
| Supply Voltage Range (Single) | 3 V to 32 V |
| Supply Voltage Range (Dual) | +/-1.5 V to +/-16 V |
| Input Offset Voltage (Typical) | 2 mV |
| Input Bias Current (Typical) | 45 nA |
| Input Common-Mode Range | Includes ground (V-) |
| Output Swing | Rail-to-rail to within ~1.5 V (typical) |
| Temperatura de funcionamiento | -40 C to +85 C |
| Encapsulado | SOT-23-5 (DBV) 2.9 x 1.6 mm |
| Tipo de montaje | Surface Mount |
| Nivel MSL | 1 (Unlimited) |
| Estado RoHS | Compliant |
Configuración de pines de LM321MF/NOPB
| Pin 1 | OUTPUT — Op-amp output |
| Pin 2 | V- — Negative supply (GND in single-supply operation) |
| Pin 3 | INPUT+ — Non-inverting input |
| Pin 4 | INPUT- — Inverting input |
| Pin 5 | V+ — Positive supply |
Aplicaciones típicas
LM321MF/NOPB es adecuado para 6 aplicacións: Industrial Sensor Signal Conditioning, Active Audio Filter / Tone Control, Portable Battery-Powered Instrumentation, Automotive 12 V Accessory Interface, General-Purpose Comparator/Buffer Stage, IoT Sensor Module Front-End.
Industrial Sensor Signal Conditioning
The LM321MF/NOPB's 3-32 V supply range makes it ideal for direct connection to industrial 24 V rails powering 4-20 mA loop transmitters, pressure transducers, and thermocouple amplifiers. Its 1 MHz bandwidth easily handles low-frequency sensor signals (typically <10 kHz), while the input common-mode range that includes ground allows ground-referenced thermocouple or shunt-current measurements without level shifting. With 0.4 V/us slew rate, the op amp can drive the 250 ohm HART filter load at the loop output. Placed in a SOT-23-5 footprint on a small daughter-card, it replaces larger SOIC-8 op amps in compact PLC analog input modules.
Recomendado
Active Audio Filter / Tone Control
With 1 MHz gain-bandwidth product and 0.4 V/us slew rate, the LM321MF/NOPB is well-suited for audio-band active filters operating from 20 Hz to 20 kHz. It supports Sallen-Key low-pass, high-pass, and band-pass topologies with +/-15 V dual rails for professional audio headroom. The SOT-23-5 package fits inside compact guitar-effect pedal, headphone amplifier, and mixer-channel boards where PCB real estate is at a premium. Unlike a switching regulator-fed op amp, its bipolar architecture adds no high-frequency EMI to the audio path, preserving the signal-to-noise ratio of high-impedance pickups.
Recomendado
Portable Battery-Powered Instrumentation
The LM321MF/NOPB runs from a single 3 V supply, making it compatible with two AA cells or a single lithium coin cell plus boost converter. Its 1 MHz bandwidth supports instrumentation amplifier front-ends for portable ECG, pulse-oximeter, and environmental sensor designs. While not the lowest-power option (0.6 mA Iq), it offers superior 32 V input transient survival compared to 5 V CMOS op amps - critical when hot-plugging sensors into battery-powered systems. Used as a buffer between a high-impedance pH or conductivity probe and an ADC, it preserves measurement accuracy across the full battery discharge curve.
Recomendado
Automotive 12 V Accessory Interface
The LM321MF/NOPB's 32 V supply rating gives ample margin above the 13.5 V nominal automotive rail and the +40 V load-dump transient specified in ISO 7637-2. With the bipolar input stage, it handles the wide common-mode swings seen in body-control modules driving seat-position, mirror-adjust, or HVAC damper feedback potentiometers. The SOT-23-5 package suits the high-density PCB layouts found in modern BCMs and head-unit audio pre-amp boards. For AEC-Q100 qualified alternatives in safety-relevant ECUs, consider TI's TLV9061-Q1 or OPA2991-Q1 in the same SOT-23 footprint.
Recomendado
General-Purpose Comparator/Buffer Stage
Beyond amplification, the LM321MF/NOPB functions as a low-cost comparator or unity-gain buffer for logic-level translation between 3.3 V MCUs and 5 V or 12 V peripherals. Its 1 MHz bandwidth is sufficient for buffered ADC reference distribution or DAC output buffering in motor-control and LED-driver boards. The SOT-23-5 footprint simplifies layout when only one op amp is needed alongside a multi-channel IC. When used as a comparator, the 2 mV typical offset and 0.4 V/us slew rate translate to microsecond response times suitable for over-current or threshold detection.
Recomendado
IoT Sensor Module Front-End
The LM321MF/NOPB's SOT-23-5 footprint and 3-32 V supply tolerance suit IoT sensor modules that must operate from varied sources including 24 V PoE, 12 V solar battery, or 3.3 V MCU rails. Its 1 MHz bandwidth supports bridge-sensor amplification for load cells, strain gauges, and MEMS accelerometers in smart-home and industrial-IoT nodes. The op amp's input common-mode range including ground enables single-supply ratiometric measurements tied to the ADC reference. For battery-driven IoT endpoints where quiescent current matters more than supply range, the TLV9062 or MCP6001 in the same footprint offer sub-microamp operation.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LM321MF/NOPB — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LM321MFX/NOPB | LMV321MF/NOPB | TLV2371IDBVR | TLV9001IDCKR | MCP6001T-E/OT |
|---|---|---|---|---|---|---|
| Package | SOT-23-5 (DBV) | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Microchip Technology |
| Supply Voltage (Max, Single) | 32 V | 32 V | 5 V | 16 V | 5.5 V | 6 V |
| Gain Bandwidth Product | 1 MHz | 1 MHz | 1 MHz | 3 MHz | 1.5 MHz | 1 MHz |
| Slew Rate | 0.4 V/us | 0.4 V/us | 1 V/us | 2 V/us | 2 V/us | 0.6 V/us |
| Quiescent Current (Typ) | 0.6 mA | 0.6 mA | 130 uA | 750 uA | 60 uA | 100 uA |
| Input Offset Voltage (Typ) | 2 mV | 2 mV | 1.7 mV | 0.5 mV | 0.5 mV | 0.5 mV |
| Input Stage Technology | Bipolar | Bipolar | CMOS | CMOS | CMOS | CMOS |
| Output Swing | Rail-to-rail to within ~1.5 V | Rail-to-rail to within ~1.5 V | Rail-to-rail | Rail-to-rail | Rail-to-rail | Rail-to-rail |
| Automotive Qualified | No | No | No | No (AEC-Q100 variants exist) | No (AEC-Q100 variants exist) | Extended temp grade |
Diferenciadores clave
- 32 V single-supply operation vs most SOT-23-5 op amps limited to 5-6 V (frente a LMV321MF/NOPB)
- Proven legacy LM321 architecture with broad second-source availability (frente a TLV9001IDCKR)
- Bipolar input stage with inherently low noise voltage density (frente a MCP6001T-E/OT)
Notas de diseño
Place a 0.1 uF X7R ceramic decoupling capacitor within 3 mm of the V+ pin (pin 5) to suppress supply-pump noise. For multi-op-amp boards, add a 10 uF tantalum or aluminum bulk capacitor on the supply rail to handle the LM321's bipolar-input-stage supply transients during output slewing. Estimated: at full output swing of +/-15 V at 1 kHz, peak supply current demand can reach ~5 mA from a 32 V rail.
Route input traces guarded by a ground plane to minimize leakage from the high-impedance non-inverting input. Keep the inverting-input feedback network close to pins 3 and 4 to avoid stray capacitance that can degrade phase margin above 100 kHz. Estimated: stray capacitance above ~20 pF at the inverting input may cause 20-30% bandwidth reduction in the unity-gain configuration.
Do not exceed the input common-mode range: the inputs must stay within V- to V+ minus 1.5 V for linear operation. Driving the input above V+ can cause phase reversal or latch-up on bipolar op amps. Estimated: applying 33 V to a 32 V supply input for >10 ms may permanently damage the device. Add external clamping (TVS diode) for automotive load-dump transients beyond the part's 32 V absolute maximum.
Información de cumplimiento
RoHS and REACH compliant per TI product page. /NOPB suffix denotes lead-free finish. Not AEC-Q100 qualified; AEC-Q100 alternatives exist in same SOT-23-5 package (e.g. TLV9061-Q1).
