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Texas Instruments LM7321MAX/NOPB
- Part No.:
- LM7321MAX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM7321MAX/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,973
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Product details
Overview
LM7321MAX/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 (±1.35V to ±16V). It is AEC-Q100 Grade 1 qualified and used in automotive high-side sensing and MOSFET gate driving.
For engineers reviewing the LM7321MAX/NOPB datasheet, LM7321MAX/NOPB pinout, LM7321MAX/NOPB application, or LM7321MAX/NOPB equivalent, this page provides verified specifications, package-validated pin functions, real-world application context, and cross-manufacturer alternatives with documented functional differences.
Technical Context
The LM7321MAX/NOPB employs a robust output stage enabling stable operation into unlimited capacitive loads without external compensation-critical for TFT panel buffers and ADC driver stages. Its rail-to-rail input extends 0.1V beyond supply rails, supporting both high-side and low-side current sensing across its full 2.7V–32V operating range.
Key performance parameters-including CMRR (>109dB at 32V), PSRR (≥78dB), and THD+N (−113dB)-remain stable over temperature (−40°C to +125°C) and supply voltage variation, making it suitable for automotive electrical systems and industrial power supplies where rail stability is not guaranteed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 32V (±1.35V to ±16V): supports single- and dual-supply designs including 12V/24V automotive and universal AC/DC power rails. |
| Output Current | ±125mA at VS = 32V: drives heavy loads such as MOSFET gates, optocouplers, and varactor diodes directly without external buffers. |
| Gain Bandwidth Product | 24MHz: enables closed-loop operation up to ~1MHz at G = 24 while maintaining phase margin with capacitive loads. |
| Slew Rate | 35V/µs: ensures fast settling for pulse-driven loads (e.g., photodiode biasing, analog optocoupler control) without distortion. |
| Capacitive Load Tolerance | Unlimited: eliminates need for isolation resistors or external compensation when driving >1nF loads (e.g., LCD column drivers, long cables). |
| Input Common-Mode Range | (V−) − 0.1V to (V+) + 0.1V: enables true rail-to-rail input operation, critical for precision below-ground current sensing and high-side shunt monitoring. |
| THD+N | −113dB at 1kHz, AV = +2, RL = 100kΩ: preserves signal fidelity in audio-grade and precision analog signal chains. |
Pinout & Package
LM7321MAX/NOPB is supplied in an 8-pin SOIC (D) package measuring 4.90mm × 3.90mm, rated for surface-mount assembly and industrial temperature operation (−40°C to +125°C).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No connection | Internally unused; must be left floating or tied to ground per layout best practice to minimize noise coupling. |
| 2 | Inverting Input (−IN) | Differential input node; high-impedance (IB = 0.4µA max) with rail-to-rail common-mode range. |
| 3 | Non-inverting Input (+IN) | Differential input node; matched offset and bias characteristics to −IN for precision closed-loop configurations. |
| 4 | Negative Supply (V−) | Return path for dual-supply operation; supports operation down to −16V; also serves as reference for single-supply negative rail. |
| 5 | No connection | Internally unused; no internal bond wire; recommended to leave unconnected or ground for EMI reduction. |
| 6 | Output (OUT) | Class-AB output stage capable of ±125mA sourcing/sinking; rail-to-rail swing within 50mV of rails at light load. |
| 7 | Positive Supply (V+) | Primary power rail; accepts up to +16V in dual-supply mode or up to +32V in single-supply configuration. |
| 8 | No connection | Unused terminal; electrically isolated; PCB pad may be grounded for thermal relief or left NC. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input extends 0.1V beyond rails; output swings within 50mV of rails at 10kΩ load-enables full dynamic range utilization in low-voltage systems. |
| Unlimited capacitive load drive | Stable with any CL value (tested up to 12.2nF); removes need for series Riso, simplifying layout in display and sensor interface circuits. |
| AEC-Q100 Grade 1 qualification | Qualified for automotive ambient temperatures (−40°C to +125°C) and lifetime reliability requirements-suitable for engine control, ADAS, and body electronics. |
| Low input voltage noise | 11.9nV/√Hz at 2kHz: preserves SNR in low-level signal conditioning (e.g., photodiode transimpedance amplifiers). |
| High open-loop gain | 87dB typical (VS = 32V): ensures <0.01% gain error in precision instrumentation and closed-loop current sources. |
Applications
| Automotive High-Side Sensing | MOSFET Gate Driving |
|---|---|
Use Scenario: Monitoring battery current in 12V/24V vehicle systems using a high-side shunt resistor. IC Role / Device Role / Timing Role: Precision current-sense amplifier with rail-to-rail input extending below ground and high CMRR (>109dB) to reject supply noise. Use Value: Enables accurate current measurement without level-shifting circuitry or dedicated current-sense ICs, reducing BOM count and board space. |
Use Scenario: Directly driving N-channel MOSFET gates in DC-DC converter feedback loops or motor control stages. IC Role / Device Role / Timing Role: High-current buffer amplifier delivering ±125mA peak current to charge/discharge gate capacitance rapidly. Use Value: Reduces switching transition time and conduction losses; eliminates need for discrete transistor buffers or gate drivers. |
| Capacitive Proximity Sensing | Photodiode Biasing |
Use Scenario: Driving and sensing self-capacitance changes in touch panels or proximity switches in industrial HMI. IC Role / Device Role / Timing Role: Excitation source and signal conditioner with unlimited CL tolerance and low THD+N (−113dB). Use Value: Maintains signal integrity across variable parasitic capacitance; enables sub-millimeter detection resolution without recalibration. |
Use Scenario: Providing stable reverse-bias voltage to photodiodes in optical smoke detectors or medical pulse oximeters. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source with rail-to-rail output and 12nV/√Hz input noise density. Use Value: Maximizes photocurrent SNR and dynamic range; supports ultra-low-light detection without additional noise-contributing components. |
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 |
|---|---|---|---|
| AD820ARZ | Lower output current (±20mA), lower GBW (1.9MHz), no AEC-Q100 qualification. | Not suitable for direct MOSFET gate drive or automotive under-hood use; limited to low-power signal conditioning. | Select only for cost-sensitive, non-automotive, low-current applications where speed and drive strength are secondary. |
| OPA2350UA | Higher input bias current (2pA vs 0.4µA), lower output current (±40mA), same rail-to-rail I/O but no unlimited CL support. | Requires external isolation resistor for >100pF loads; unsuitable for TFT column drivers or long-cable interfaces. | Prefer when ultra-low input current is required (e.g., high-Z sensor front-ends), but avoid where capacitive load stability is critical. |
Compared with AD820ARZ and OPA2350UA, LM7321MAX/NOPB uniquely combines automotive qualification, ±125mA drive, 24MHz bandwidth, and unconditional stability into arbitrary capacitive loads-making it the only choice for robust, high-fidelity, high-current analog interface in demanding environments.
Availability
LM7321MAX/NOPB is available at Aetrix Electronics and suitable for automotive battery monitoring, industrial motor control, and medical optical sensing requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LM7321MAX/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, embedded processing, and connectivity technologies with decades of op amp innovation and automotive qualification expertise.
The LM732xx family was designed specifically for high-reliability, high-output-current analog signal paths in automotive and industrial systems-emphasizing rail-to-rail operation, capacitive-load immunity, and wide-supply flexibility.
FAQ
What is the maximum capacitive load the LM7321MAX/NOPB can drive without oscillation?
The LM7321MAX/NOPB is explicitly designed to drive unlimited capacitive loads without external compensation or isolation resistors. TI's datasheet confirms stable operation with loads up to 12.2nF (Figure 5-39), and the device maintains ≥15° phase margin even at 10µF (Figure 6-1). This capability is intrinsic to its internal compensation architecture and applies across its full operating voltage and temperature range.
Does the LM7321MAX/NOPB support single-supply operation?
Yes, LM7321MAX/NOPB supports true single-supply operation from 2.7V to 32V. Its rail-to-rail input extends 0.1V beyond V− (which may be ground) and V+, and its output swings within 50mV of either rail at light loads. This allows direct interfacing with microcontroller ADCs, sensors, and logic without level-shifting circuitry.
Is the LM7321MAX/NOPB pin-compatible with other members of the LM732x family?
LM7321MAX/NOPB (single-channel, SOIC-8) shares identical pinout with LM7322x dual-channel variants in SOIC-8 packages (e.g., LM7322MA/NOPB), except pins 1, 5, and 8 are NC on LM7321MAX/NOPB but used for second amplifier I/O on LM7322x. Layout reuse is possible if second amplifier is unused or omitted from schematic.
What is the thermal performance of the LM7321MAX/NOPB in SOIC package?
In its SOIC-8 (D) package, LM7321MAX/NOPB has a junction-to-ambient thermal resistance (RθJA) of 133.5°C/W. At TA = 25°C, maximum allowable power dissipation is 0.936W; at TA = 125°C, it drops to 0.202W. Derating curves and thermal layout guidance are provided in Section 5.4 and Section 7.2 of the official datasheet.
How does the LM7321MAX/NOPB perform in automotive applications requiring AEC-Q100 compliance?
LM7321MAX/NOPB is AEC-Q100 Grade 1 qualified (−40°C to +125°C), with tested reliability for HTOL, TC, UHAST, and ESD (HBM ±2000V, CDM ±1000V). Its parameters-including offset drift (±2.5µV/°C), CMRR (>109dB), and PSRR (≥78dB)-are fully specified across this range, ensuring consistent performance in engine control units, battery management, and ADAS subsystems.
LM7321MAX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
LM7321MAX/NOPB FAQ
1.How can I place an order for LM7321MAX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM7321MAX/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 LM7321MAX/NOPB reliable?
The price and inventory of LM7321MAX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM7321MAX/NOPB is usually 5 days.
3.What payment methods are accepted for LM7321MAX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM7321MAX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM7321MAX/NOPB?
LM7321MAX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM7321MAX/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 LM7321MAX/NOPB?
For technical support, including LM7321MAX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM7321MAX/NOPB requirements.
6.How does Aetrix verify that LM7321MAX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM7321MAX/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 LM7321MAX/NOPB meets industry standards.
7.What is the process for return or replacement of LM7321MAX/NOPB?
All LM7321MAX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM7321MAX/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 LM7321MAX/NOPB part is unused and in its original packaging.
Return procedure for LM7321MAX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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