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Texas Instruments LM7321MFX/NOPB
- Part No.:
- LM7321MFX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM7321MFX/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,234
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Product details
Overview
LM7321MFX/NOPB from Texas Instruments is a single-channel rail-to-rail input/output operational amplifier optimized for high-output-current, wide-supply, and capacitive-load-tolerant applications. It delivers ±125mA output current, 24MHz gain bandwidth, 35V/µs slew rate, and operates from 2.7V to 32V supply. It is AEC-Q100 Grade 1 qualified and used in automotive high-side sensing and MOSFET gate driving.
For engineers reviewing the LM7321MFX/NOPB datasheet, LM7321MFX/NOPB pinout, LM7321MFX/NOPB application, or LM7321MFX/NOPB equivalent, key selection criteria include unlimited capacitive load drive capability, rail-to-rail I/O swing down to 50mV from rails at 2kΩ load, −113dB THD+N at 1kHz, and operation across −40°C to +125°C with supply voltage insensitivity.
Technical Context
The LM7321MFX/NOPB employs a robust output stage enabling stable operation into unlimited capacitive loads without external compensation-verified up to 12,200pF in large-signal step response testing. Its input stage supports common-mode voltage from (V−) − 0.1V to (V+) + 0.1V, enabling true high-side and low-side sensing in single- or dual-supply configurations.
Performance remains consistent across 2.7V–32V supply range: open-loop gain (75–87dB), CMRR (93–125dB), and PSRR (74–104dB) are all specified over full temperature and voltage ranges. Input voltage noise (11.9nV/√Hz) and current noise (0.5pA/√Hz) support precision signal conditioning in photodiode biasing and analog optocoupler interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 32V - enables direct use in 12V/24V automotive systems and wide-input industrial power supplies without regulation. |
| Output Current | ±125mA - drives power transistors, MOSFET gates, and varactor diodes directly without external buffers. |
| Gain Bandwidth Product | 24MHz - supports closed-loop bandwidth >1MHz at G=10, suitable for active filters and fast-settling sensor interfaces. |
| Slew Rate | 35V/µs - ensures <100ns 10V step response, critical for pulse amplification and DAC output buffering. |
| Capacitive Load Tolerance | Unlimited - eliminates need for isolation resistors when driving ADC inputs, LCD column drivers, or long cables. |
| Input Common-Mode Range | (V−) − 0.1V to (V+) + 0.1V - allows sensing below ground (e.g., shunt current monitoring) and above V+ (e.g., high-side battery monitoring). |
| THD+N | −113dB at 1kHz - preserves signal fidelity in audio line drivers and precision analog transmission paths. |
Pinout & Package
SOT-23-5 package (2.90mm × 1.60mm), surface-mount, thermally enhanced for high-current operation in space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Output | Amplified signal output; capable of sourcing/sinking ±125mA while maintaining rail-to-rail swing within 50mV at 2kΩ. |
| 2 - V− | Negative Supply | Return path for dual-supply operation or ground reference in single-supply; supports operation down to 2.7V total supply. |
| 3 - +IN | Non-inverting Input | Differential input terminal with 0.4µA max bias current; accepts signals beyond rails by 0.1V for true overvoltage-tolerant sensing. |
| 4 - −IN | Inverting Input | Differential input terminal; matched to +IN for <6mV offset and ±2.5µV/°C drift over −40°C to +125°C. |
| 5 - V+ | Positive Supply | Primary power input; supplies internal bias and output stage; supports up to 32V differential with 150°C max junction temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output swing | Enables full dynamic range utilization in low-voltage (2.7V) and high-voltage (32V) systems without level-shifting circuitry. |
| AEC-Q100 Grade 1 qualification | Validated for automotive ambient temperatures (−40°C to +125°C) and lifetime reliability in engine control, ADAS, and body electronics. |
| Unlimited capacitive load drive | Eliminates stability concerns when interfacing with ADC sample-and-hold capacitors, piezoelectric sensors, or long PCB traces. |
| Low input voltage noise (11.9nV/√Hz) | Preserves SNR in low-level signal chains such as photodiode transimpedance amplifiers and strain gauge bridges. |
| Supply-insensitive parameters | CMRR, PSRR, and GBW vary <10% from 2.7V to 32V - simplifies design across battery, adapter, and automotive supply conditions. |
Applications
| High-Side Sensing | Below-Ground Current Sensing |
|---|---|
Use Scenario: Monitoring battery pack voltage or 48V bus voltage in electric vehicle DC-DC converters using a single-ended measurement referenced to system ground. IC Role / Device Role / Timing Role: Precision buffer amplifier with rail-to-rail input accepting common-mode voltages up to (V+) + 0.1V, rejecting supply ripple via 104dB PSRR. Use Value: Enables accurate high-side voltage measurement without isolated amplifiers or expensive voltage dividers, reducing BOM cost and layout area. | Use Scenario: Measuring motor phase current in inverter legs where shunt resistor is placed between power switch and ground, producing negative-going signals relative to system ground. IC Role / Device Role / Timing Role: Differential amplifier configured for single-ended input with extended common-mode range down to (V−) − 0.1V, supporting bidirectional current detection. Use Value: Eliminates need for level-shifting op-amps or dedicated current-sense ICs, enabling direct connection to MCU ADC with minimal external components. |
| Driving MOSFETs and Power Transistors | Photodiode Biasing |
Use Scenario: Gate driving of N-channel MOSFETs in high-current switching regulators or half-bridge motor drivers requiring fast turn-on/turn-off and high peak current. IC Role / Device Role / Timing Role: High-current unity-gain buffer delivering ±125mA transient current to charge/discharge gate capacitance rapidly. Use Value: Reduces gate drive loop inductance and propagation delay versus discrete transistor drivers, improving efficiency and EMI performance. | Use Scenario: Providing stable reverse-bias voltage to silicon photodiodes in optical smoke detectors or medical pulse oximeters operating in low-light conditions. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source with 11.9nV/√Hz input noise and <6mV offset, minimizing dark current error and shot-noise contribution. Use Value: Increases signal-to-noise ratio by >15dB versus standard op-amps, extending detection range and lowering false-alarm rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-output-current, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM7321MA/NOPB | Same electrical specs; SOIC-8 package (4.90mm × 3.90mm) vs SOT-23-5 - larger footprint, higher thermal resistance (133.5°C/W vs 185.4°C/W). | Preferred where board space permits and higher power dissipation margin is needed; not suitable for ultra-dense layouts. | Select LM7321MA/NOPB when thermal headroom exceeds 0.7W at 125°C ambient or when existing SOIC footprints must be reused. |
| TLV2782IDR | Lower output current (±25mA), lower GBW (10MHz), but lower quiescent current (0.55mA/channel); not AEC-Q100 qualified. | Targeted at battery-powered portable instrumentation, not automotive or high-power industrial use. | Choose TLV2782IDR only for low-power, non-automotive applications where output current <30mA suffices and AEC-Q100 compliance is unnecessary. |
Compared with LM7321MA/NOPB, LM7321MFX/NOPB offers superior thermal performance in compact layouts but requires careful PCB copper pour design for >1W dissipation; versus TLV2782IDR, it trades 2.5× higher supply current for 5× higher output drive and full automotive qualification - essential for safety-critical sensing and actuation.
Availability
LM7321MFX/NOPB is available at Aetrix Electronics and suitable for automotive powertrain monitoring, industrial motor control, and high-reliability medical device signal conditioning requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM7321MFX/NOPB 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 high-performance op amps and automotive-grade components.
The LM732xx product line was engineered specifically for demanding industrial and automotive applications requiring robust capacitive-load drive, wide supply tolerance, and guaranteed operation from −40°C to +125°C - addressing limitations of legacy rail-to-rail op amps in power electronics and sensor interfaces.
FAQ
What is the maximum capacitive load the LM7321MFX/NOPB can drive without oscillation?
The LM7321MFX/NOPB is explicitly designed for unlimited capacitive load drive - verified stable with loads up to 12,200pF in large-signal step response testing (Figure 5-39). No external isolation resistor is required, though adding 10–100Ω in series improves settling time and overshoot for loads >1nF. This capability eliminates stability concerns in ADC driver, LCD, and cable-driving applications.
Does the LM7321MFX/NOPB support true rail-to-rail input common-mode voltage range?
Yes - the LM7321MFX/NOPB accepts input common-mode voltages from (V−) − 0.1V to (V+) + 0.1V, exceeding rail-to-rail by 100mV on both sides. This enables high-side sensing above V+ (e.g., battery voltage monitoring) and below-ground sensing (e.g., shunt-based current measurement), confirmed in Figure 5-49 and Section 5.5 VCM specification.
Is the LM7321MFX/NOPB qualified for automotive applications?
Yes - the LM7321MFX/NOPB is AEC-Q100 Grade 1 qualified, certified for operation from −40°C to +125°C ambient temperature with full electrical characterization across this range. It meets automotive reliability requirements including HTOL, TC, and ESD (HBM ±2000V, CDM ±1000V), making it suitable for engine control, ADAS, and body electronics.
What is the typical output voltage swing for the LM7321MFX/NOPB at ±15V supply?
At ±15V supply (VS = 30V), the LM7321MFX/NOPB delivers rail-to-rail output swing within 50mV of each rail under 100mV input differential (Section 5.5 VOUT spec). With 2kΩ load, swing is within 250mV of rails; with 10kΩ load, it improves to within 150mV - enabling full 30Vpp signal range in precision analog output stages.
How does the LM7321MFX/NOPB compare to standard rail-to-rail op amps in terms of supply voltage sensitivity?
Unlike many rail-to-rail op amps, LM7321MFX/NOPB exhibits minimal supply voltage dependence: GBW varies <5%, CMRR stays within 93–125dB, and PSRR remains 74–104dB across 2.7V–32V. This insensitivity simplifies design in variable-supply environments like automotive 12V systems (9–16V) or universal-input industrial supplies (18–32V), eliminating recalibration or gain trimming.
LM7321MFX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 18V/µs
- Gain Bandwidth Product:
- 20 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1.1 µA
- Voltage - Input Offset:
- 700 µV
- Current - Supply:
- 1.1mA
- Current - Output / Channel:
- 100 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 32 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM7321MFX/NOPB FAQ
1.How can I place an order for LM7321MFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM7321MFX/NOPB 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 LM7321MFX/NOPB reliable?
The price and inventory of LM7321MFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM7321MFX/NOPB is usually 5 days.
3.What payment methods are accepted for LM7321MFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM7321MFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM7321MFX/NOPB?
LM7321MFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM7321MFX/NOPB 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 LM7321MFX/NOPB?
For technical support, including LM7321MFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM7321MFX/NOPB requirements.
6.How does Aetrix verify that LM7321MFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM7321MFX/NOPB 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 LM7321MFX/NOPB meets industry standards.
7.What is the process for return or replacement of LM7321MFX/NOPB?
All LM7321MFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM7321MFX/NOPB, 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 LM7321MFX/NOPB part is unused and in its original packaging.
Return procedure for LM7321MFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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