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Texas Instruments LM7321QMF/NOPB
- Part No.:
- LM7321QMF/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM7321QMF/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,295
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Product details
Overview
LM7321QMF/NOPB from Texas Instruments is a single-channel, rail-to-rail input and output operational amplifier qualified for automotive Grade 1 (−40°C to +125°C), featuring ±125mA output current, 24MHz gain bandwidth product, 35V/µs slew rate, and unlimited capacitive load drive capability. It operates from 2.7V to 32V supply and is used in high-side sensing, MOSFET gate driving, and photodiode biasing circuits.
For engineers reviewing the LM7321QMF/NOPB datasheet, LM7321QMF/NOPB pinout, LM7321QMF/NOPB application, or LM7321QMF/NOPB equivalent, key selection criteria include output current capability under wide supply range, rail-to-rail I/O performance across temperature, capacitive load stability, THD+N (−113dB), and AEC-Q100 Grade 1 qualification for automotive powertrain and body electronics.
Technical Context
The LM7321QMF/NOPB employs a robust output stage enabling stable operation into unlimited capacitive loads without external compensation-critical for TFT panel buffers and ADC driver applications. Its input stage supports common-mode voltage from (V−) −0.1V to (V+) +0.1V, delivering >90dB CMRR over full supply range (2.7V–32V).
Designed for supply-voltage-insensitive performance, key parameters-including GBW, slew rate, and offset drift-remain stable across ±1.35V to ±16V operation. This enables reliable use in battery-powered systems and automotive 12V/24V architectures where supply variation is inherent.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 32V - supports single-supply (2.7V) and dual-supply (±15V) operation in industrial and automotive systems. |
| Output Current | ±125mA - drives heavy loads such as MOSFET gates, optocouplers, and varactor diodes directly without external buffers. |
| Gain Bandwidth Product | 24MHz - enables stable closed-loop operation up to ~1MHz at G = +25 with adequate phase margin. |
| Slew Rate | 35V/µs - delivers fast transient response for pulse amplification and active filtering in signal conditioning paths. |
| Input Voltage Noise | 12nV/√Hz at 2kHz - low-noise performance suitable for precision sensor interfaces including photodiode biasing. |
| THD+N | −113dB at 1kHz, AV = +2, RL = 100kΩ - ultra-low distortion for high-fidelity analog signal chains in audio and measurement systems. |
| Operating Temperature | −40°C to +125°C - AEC-Q100 Grade 1 qualified for under-hood and chassis-mounted automotive electronics. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90mm × 1.60mm, surface-mount, thermally enhanced for high-current operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Output | Amplified signal output capable of sourcing/sinking ±125mA; rail-to-rail swing within 50mV of either supply rail at light load. |
| 2 - V− | Negative Supply | Ground or negative rail connection; supports single-supply (V− = GND) and dual-supply (V− = −VS) configurations. |
| 3 - +IN | Non-inverting Input | Differential input with rail-to-rail common-mode range (V− −0.1V to V+ +0.1V); enables high-side and low-side current sensing. |
| 4 - −IN | Inverting Input | Complements +IN for standard op-amp configurations; maintains >90dB CMRR across full supply and temperature range. |
| 5 - V+ | Positive Supply | Primary power input; accepts up to 32V total supply (V+ − V−); quiescent current remains stable across voltage range. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization in low-voltage (2.7V) and high-voltage (32V) systems without level-shifting circuitry. |
| Unlimited capacitive load drive | Eliminates need for isolation resistors or external compensation when driving LCD column drivers, ADC inputs, or long cables. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications requiring operation from −40°C to +125°C ambient with robust ESD (±2kV HBM) and latch-up immunity. |
| Low input bias current (0.4µA typ) | Minimizes error in high-impedance sensor interfaces (e.g., photodiodes, capacitive proximity sensors) across temperature. |
| Supply-voltage-insensitive parameters | GBW, slew rate, and CMRR remain stable from 2.7V to 32V - simplifies design reuse across multiple platform voltages. |
Applications
| High-Side Sensing | Photodiode Biasing |
|---|---|
Use Scenario: Monitoring battery pack voltage or 48V bus current in EV power distribution units using shunt-based measurement above ground potential. IC Role / Device Role / Timing Role: Precision current-sense amplifier configured in high-side differential configuration with rail-to-rail input extending common-mode range beyond supply rails. Use Value: Enables accurate sub-mV offset measurements at VCM = V+ − 0.1V with >90dB CMRR, eliminating need for expensive isolated amplifiers. |
Use Scenario: Providing stable reverse-bias voltage to silicon photodiodes in automotive LIDAR receivers and ambient light sensors. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier (TIA) front-end with 12nV/√Hz input voltage noise and <0.4µA input bias current. Use Value: Maximizes signal-to-noise ratio in low-light conditions while maintaining linearity over −40°C to +125°C operating range. |
| MOSFET Gate Driving | Capacitive Proximity Sensing |
Use Scenario: Directly driving N-channel power MOSFETs in automotive HVAC blower motor control and LED headlamp dimming circuits. IC Role / Device Role / Timing Role: High-current buffer amplifier delivering ±125mA peak output to charge/discharge gate capacitance rapidly. Use Value: Reduces switching losses by achieving <100ns rise/fall times on 1nF gate loads, improving system efficiency and thermal margin. |
Use Scenario: Exciting and detecting capacitance changes in touch-sensitive door handles and interior trim panels in vehicles. IC Role / Device Role / Timing Role: Precision oscillator driver and signal conditioner in relaxation oscillator-based capacitive sensing front-ends. Use Value: Stable oscillation frequency over temperature due to supply-insensitive GBW and slew rate, enabling <1pF resolution detection. |
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 |
|---|---|---|---|
| LM7321MFX/NOPB | Same die, SOIC-8 package (4.90mm × 3.90mm); higher RθJA (133.5°C/W vs 185.4°C/W), lower max power dissipation at elevated ambient. | Better suited for board space-constrained layouts where SOT-23 footprint is unavailable; less optimal for high-current continuous operation at >85°C ambient. | Select LM7321MFX/NOPB only when PCB layout requires SOIC-8 or thermal management includes heatsinking or forced air. |
| TSV911ICT | Single-channel, rail-to-rail I/O, but limited to ±40mA output current and 8MHz GBW; not AEC-Q100 qualified. | Applicable only in non-automotive, low-power consumer or industrial sensor nodes where output current <50mA suffices. | Choose TSV911ICT only for cost-sensitive, non-automotive designs with modest speed and drive requirements - not a functional replacement. |
Compared with LM7321MFX/NOPB, LM7321QMF/NOPB offers superior thermal performance in compact SOT-23 packaging and higher current density; versus TSV911ICT, it delivers 3.1× more output current, 3× higher GBW, and automotive-grade reliability - making it irreplaceable in safety-critical drivetrain and ADAS subsystems.
Availability
LM7321QMF/NOPB is available at Aetrix Electronics and suitable for automotive powertrain control, high-side current sensing, and photodiode biasing applications requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM7321QMF/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 experience in high-reliability automotive and industrial IC design.
The LM732xx family was engineered specifically for demanding automotive and industrial applications requiring robust rail-to-rail performance, high output current, and guaranteed operation across −40°C to +125°C - targeting powertrain, body electronics, and sensor interface systems.
FAQ
What is the maximum capacitive load the LM7321QMF/NOPB can drive without oscillation?
The LM7321QMF/NOPB is explicitly designed to drive unlimited capacitive loads without oscillation, as confirmed in TI's datasheet Section 6.4.1 and Figure 6-1 (Phase Margin vs Capacitive Load). This eliminates the need for series isolation resistors in applications like LCD column drivers and ADC input buffering - provided layout practices minimize parasitic inductance in the output path.
Does the LM7321QMF/NOPB support true rail-to-rail input common-mode voltage?
Yes - the LM7321QMF/NOPB accepts input voltages from (V−) −0.1V to (V+) +0.1V, exceeding rail-to-rail by 100mV on both sides. This is verified in Section 5.5 (Electrical Characteristics) under "VCM Common-mode input voltage range" and enables reliable high-side and low-side current sensing without external level-shifting circuitry.
Is the LM7321QMF/NOPB pin-compatible with other members of the LM732x family?
No - LM7321QMF/NOPB is a single-channel SOT-23-5 device, while LM7322x parts are dual-channel in VSSOP-8 or SOIC-8 packages. Pinouts differ fundamentally: LM7321QMF/NOPB uses pins 1–5 for OUT/V−/+IN/−IN/V+, whereas dual variants allocate separate pins for each amplifier's inputs and outputs. Board redesign is required for substitution.
What is the typical supply current of the LM7321QMF/NOPB at 25°C?
The LM7321QMF/NOPB draws 1.35mA typical supply current per channel at TA = 25°C, as specified in Section 5.5 (Electrical Characteristics) under "IS Supply Current (per channel)". This value remains stable across 2.7V–32V supply range, supporting energy-efficient operation in battery-powered automotive modules.
How does the LM7321QMF/NOPB perform in terms of THD+N at audio frequencies?
At 1kHz, AV = +2, RL = 100kΩ, and VOUT = 210mVPP, the LM7321QMF/NOPB achieves −113dB THD+N (Section 5.5). This ultra-low distortion is maintained up to 10kHz (Figure 5-43), making it suitable for high-fidelity analog signal paths in automotive infotainment and active noise cancellation systems.
LM7321QMF/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM7321QMF/NOPB FAQ
1.How can I place an order for LM7321QMF/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM7321QMF/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 LM7321QMF/NOPB reliable?
The price and inventory of LM7321QMF/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM7321QMF/NOPB is usually 5 days.
3.What payment methods are accepted for LM7321QMF/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM7321QMF/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM7321QMF/NOPB?
LM7321QMF/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM7321QMF/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 LM7321QMF/NOPB?
For technical support, including LM7321QMF/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM7321QMF/NOPB requirements.
6.How does Aetrix verify that LM7321QMF/NOPB is sourced from the original manufacturer or authorized distributors?
All LM7321QMF/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 LM7321QMF/NOPB meets industry standards.
7.What is the process for return or replacement of LM7321QMF/NOPB?
All LM7321QMF/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM7321QMF/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 LM7321QMF/NOPB part is unused and in its original packaging.
Return procedure for LM7321QMF/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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