LM7321MFX/NOPB - 32V 20MHz RRIO Op Amp SOT-23-5 | TI
MPN: LM7321MFX/NOPB β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.29 | $1.29 |
| 10 | $1.16 | $11.60 |
| 100 | $0.92 | $92.00 |
| 500 | $0.75 | $375.00 |
| 1,000 | $0.6 | $600.00 |
Drop-in alternatives for LM7321MFX/NOPB β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
LM7321QMFX/NOPB
β Drop-Inπ Reference alternative (not in catalog)
LM8261M5X/NOPB
β Drop-Inπ Reference alternative (not in catalog)
MCP6291T-E/OT
β Drop-Inπ Reference alternative (not in catalog)
AD8615ARTZ
β Drop-Inπ Reference alternative (not in catalog)
LM7321MFX/NOPB Maximum Ratings & Electrical Characteristics
| Amplifier Channels | 1 |
| Unity Gain Bandwidth | 20 MHz |
| Slew Rate | 18 V/us |
| Supply Current Per Amp | 1 mA (approx.) |
| Total Supply Voltage Min | 2.5 V |
| Total Supply Voltage Max | 32 V (up to +/-16 V) |
| Output Current | 65 mA |
| Input/Output Type | Rail-to-Rail Input and Output (RRIO) |
| Capacitive Load Drive | Unlimited capacitive load |
| Operating Temperature Range | -40C to +125C |
| Package | SOT-23-5 (DBV), 5 pins |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (MFX) |
| RoHS Status | Compliant (NOPB, lead-free) |
| Specified Supply Points | 2.7 V, +/-5 V, +/-15 V |
| Type | General Purpose Amplifier |
LM7321MFX/NOPB Pin Configuration
| Pin 1 | OUT β Amplifier output (rail-to-rail, 65 mA) |
| Pin 2 | V- β Negative supply rail / GND (single supply) |
| Pin 3 | IN+ β Non-inverting input (rail-to-rail) |
| Pin 4 | IN- β Inverting input (rail-to-rail) |
| Pin 5 | V+ β Positive supply rail (2.5V to 32V total) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
LM7321MFX/NOPB is suitable for 6 applications: Coaxial Cable Driver, ADC Input Buffering, Battery-Powered Portable Instrumentation, Industrial Signal Conditioning, Active Filter Design, Test and Measurement Probes.
Coaxial Cable Driver
The LM7321MFX/NOPB's 65-mA output current and unlimited capacitive load stability make it a natural line driver for coaxial cables in video and instrumentation systems. Conventional op amps oscillate when driving cable capacitance, but the LM7321 remains stable without series isolation resistors. Placed at the output of a signal generator or camera path, it delivers 20-MHz bandwidth across a 2.5V-to-32V supply range, and the SOT-23-5 footprint keeps the driver near the connector to minimize trace inductance.
Recommended
ADC Input Buffering
Switched-capacitor SAR ADC inputs draw transient charge that destabilizes ordinary op amps. The LM7321 solves this with 65-mA transient drive and unlimited capacitive load stability, allowing a direct RC filter capacitor at the ADC input. Its rail-to-rail I/O preserves full-scale swing on single 5V supplies, and 20-MHz bandwidth settles sampling transients well within typical microsecond acquisition windows. TI specifies full performance at 2.7V and +/-5V, matching common ADC supply architectures.
Recommended
Battery-Powered Portable Instrumentation
With only about 1 mA of supply current per amplifier, the LM7321 balances speed and power for battery-operated instruments, sensors, and handheld meters. The 2.5V minimum supply supports single-cell Li-Ion (3.0V-4.2V) rails, and rail-to-rail I/O extracts maximum dynamic range as the battery discharges. Unlike micropower op amps that sacrifice bandwidth to single-digit kHz or MHz, the LM7321 retains 20-MHz GBW, enabling fast pulse and AC measurements in portable designs.
Recommended
Industrial Signal Conditioning
Industrial PLC and sensor interfaces benefit from the LM7321's 32V total supply ceiling, which directly accommodates +/-15V analog backplanes without level-shifting front ends. The -40C to +125C temperature range covers factory-floor extremes, and high output current drives heavy filter networks, cable runs, and actuators. TI fully specifies parameters at +/-15V, so gain-bandwidth and slew rate numbers in industrial designs match datasheet conditions rather than derated curves.
Recommended
Active Filter Design
High-Q active filters need amplifiers whose bandwidth exceeds the filter corner by 20x or more and whose output stage tolerates the reactive loads of feedback capacitors. The LM7321's 20-MHz GBW supports filter corners into the hundreds of kHz with stable Q, and unlimited capacitive load drive prevents oscillation in Sallen-Key and multiple-feedback topologies with large capacitor values. The 18-V/us slew rate keeps large-signal distortion low for filter outputs swinging several volts.
Recommended
Test and Measurement Probes
Handheld probes and scope front-ends demand small size, wide supply tolerance, and strong drive into cable loads. The LM7321's SOT-23-5 package fits probe-tip geometries, its +/-16V dual-supply rating handles bench instruments, and the 65-mA drive keeps 1-M//pF probe loads accurate at fast edges. Unlimited capacitive load stability is critical because probe cable capacitance varies between cable lengths - the LM7321 tolerates this variation without compensation redesign.
Recommended
Recommended Products Summary
Engineering reference data for LM7321MFX/NOPB β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM7321QMFX/NOPB | LM8261M5X/NOPB | MCP6291T-E/OT | AD8615ARTZ |
|---|---|---|---|---|---|
| Package | SOT-23-5 (DBV) | SOT-23-5 (DBV) - same | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Microchip Technology | Analog Devices |
| Unity Gain Bandwidth | 20 MHz | 20 MHz | [DATA_NEEDED] | 10 MHz | [DATA_NEEDED] |
| Slew Rate | 18 V/us | 18 V/us | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Output Current | 65 mA | 65 mA | lower (verify datasheet) | lower (verify datasheet) | lower (verify datasheet) |
| Supply Voltage Max | 32 V (+/-16 V) | 32 V | [DATA_NEEDED] | 6 V | [DATA_NEEDED] |
| Supply Current | 1 mA (approx.) | 1 mA | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Capacitive Load Drive | Unlimited | Unlimited | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Automotive Grade | No | Yes (AEC-Q100) | No | No | No |
Key Differentiators
- 65-mA output current in a SOT-23-5 (vs MCP6291T-E/OT)
- Unlimited capacitive load stability (vs AD8615ARTZ)
- Automotive variant of same die available (vs LM7321QMFX/NOPB)
Design Notes
The LM7321 accepts 2.5V to 32V total supply (up to +/-16V dual). Always place 100-nF ceramic decoupling capacitors within 2 mm of the V+ and V- pins, plus a 2.2-uF bulk capacitor per rail. Although quiescent current is only about 1 mA, the output can source 65 mA, so supply traces must be sized for peak load currents to avoid rail droop during transients.
When sourcing high output current into low-impedance loads, junction dissipation equals (V+ - VOUT) * IOUT during sourcing. In the tiny SOT-23-5 package with limited theta_JA, sustained 65-mA operation at large voltage drops can raise junction temperature significantly; verify worst-case dissipation against the -40C to +125C rating and add copper pour area under the pins when running near limits.
Although the LM7321 is unlimited-capacitive-load stable, extreme capacitive loads reduce bandwidth (closed-loop pole interaction), which slows settling in ADC applications - account for reduced effective bandwidth, not instability. Also note two datasheet generations quote 18-V/us and 35-V/us family slew rates; confirm against the specific LM7321 datasheet revision (SNOS759) you design to.
Compliance Information
NOPB suffix denotes TI non-Pb, RoHS-compliant lead-free terminations. Standard grade, not AEC-Q100 - use LM7321QMFX/NOPB for automotive qualification.
