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Texas Instruments LM7321MA/NOPB
- Part No.:
- LM7321MA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM7321MA/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:10,569
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Product details
Overview
LM7321MA/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 ±1.35V to ±16V (2.7V–32V total), enabling use in automotive power supply monitoring and MOSFET gate driving.
For engineers reviewing the LM7321MA/NOPB datasheet, LM7321MA/NOPB pinout, LM7321MA/NOPB application, or LM7321MA/NOPB equivalent, this page provides verified specifications, SOIC-8 package details, AEC-Q100 Grade 1 qualification status, and real-world implementation guidance for high-side sensing, photodiode biasing, and analog optocoupler driving.
Technical Context
The LM7321MA/NOPB employs a robust output stage capable of sourcing/sinking ±125mA while maintaining stability into unlimited capacitive loads - a key differentiator versus standard rail-to-rail op amps. Its input common-mode range extends 0.1V beyond both rails, supporting true high-side and low-side current sensing across its full 2.7V–32V supply range.
With 12nV/√Hz input voltage noise, 1pA/√Hz input current noise, and −113dB THD+N at 1kHz, it maintains precision signal integrity in demanding analog front-ends. All electrical characteristics are fully specified from −40°C to +125°C and across supply voltages including ±5V and ±15V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 32V (±1.35V to ±16V) - supports single- and dual-supply industrial and automotive systems without level-shifting. |
| Output Current | ±125mA - drives power transistors, MOSFET gates, and capacitive loads directly without external buffers. |
| Gain Bandwidth Product | 24MHz - enables stable closed-loop operation up to ~1MHz with moderate gain, suitable for active filtering and fast-settling sensor interfaces. |
| Slew Rate | 35V/µs - ensures faithful reproduction of fast transient signals (e.g., pulse-width modulated references) without distortion. |
| 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 - enables direct connection to ground-referenced or above-rail sensors in high-side configurations. |
| THD+N | −113dB at 1kHz - preserves dynamic range in audio and precision measurement paths where harmonic contamination must be minimized. |
Pinout & Package
LM7321MA/NOPB is supplied in an 8-pin SOIC (D) package measuring 4.90mm × 3.90mm, rated for surface-mount assembly and compatible with standard reflow profiles.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No internal connection - left unconnected; no routing or grounding required. |
| 2 | IN− | Inverting input - accepts feedback or differential signal; rail-to-rail common-mode range enables flexible topology selection. |
| 3 | IN+ | Non-inverting input - accepts reference or sensor signal; immune to input phase reversal due to extended common-mode range. |
| 4 | V− | Negative supply terminal - connects to system ground (in single-supply) or negative rail (in dual-supply); supports −16V minimum. |
| 5 | N/C | No internal connection - electrically isolated; PCB pad may be omitted or used for thermal relief. |
| 6 | OUT | Amplifier output - delivers ±125mA into capacitive or resistive loads; rail-to-rail swing minimizes headroom loss. |
| 7 | N/C | No internal connection - unused pin; no electrical function or thermal role. |
| 8 | V+ | Positive supply terminal - accepts up to +16V; supplies internal bias circuitry and output stage; insensitive to supply ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full dynamic range utilization in low-voltage (2.7V) and high-voltage (32V) systems without signal clipping. |
| AEC-Q100 Grade 1 | Qualified for automotive ambient temperatures (−40°C to +125°C), supporting engine control, battery monitoring, and ADAS sensor conditioning. |
| Unlimited capacitive load drive | Eliminates external compensation components when interfacing with ADCs, display drivers, or long traces - reducing BOM count and layout complexity. |
| High output current (±125mA) | Directly drives power devices (MOSFETs, IGBTs) and analog optocouplers without discrete buffer stages. |
| Low input voltage noise (12nV/√Hz) | Maintains SNR in low-level sensor amplification (e.g., photodiode, strain gauge) without requiring additional gain-stage optimization. |
Applications
| Automotive Power Supply Monitoring | Photodiode Biasing Circuit |
|---|---|
Use Scenario: Real-time monitoring of 12V/24V vehicle battery voltage and alternator output under load transients. IC Role / Device Role / Timing Role: High-side sensing amplifier configured as unity-gain buffer with rail-to-rail input extending below ground and above supply. Use Value: Enables accurate voltage measurement without level-shifting circuitry, improving diagnostic reliability across AEC-Q100 temperature range. |
Use Scenario: Precision transimpedance amplification of weak photocurrents from optical smoke detectors or medical pulse oximeters. IC Role / Device Role / Timing Role: Low-noise, low-input-bias-current op amp providing stable bias voltage and high-gain signal conversion. Use Value: 1pA/√Hz input current noise and 12nV/√Hz voltage noise preserve signal fidelity at sub-nA photocurrent levels. |
| Analog Optocoupler Driver | High-Side Current Sensing |
Use Scenario: Driving linear analog optocouplers (e.g., IL300, HCNR201) in isolated power supply feedback loops. IC Role / Device Role / Timing Role: High-output-current buffer delivering precise LED drive current despite VF variation and temperature drift. Use Value: ±125mA output capability ensures full LED modulation range; rail-to-rail output guarantees consistent forward current across supply variations. |
Use Scenario: Measuring motor phase current in BLDC inverters using shunt resistors placed between high-side switch and bus voltage. IC Role / Device Role / Timing Role: Differential amplifier with extended common-mode input range accepting signals up to VBUS + 0.1V. Use Value: Eliminates need for expensive high-side current sense ICs or complex level-shifting networks, reducing system cost and footprint. |
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 |
|---|---|---|---|
| OPA2376AIDR | Lower output current (±50mA), lower noise (7.5nV/√Hz), but no AEC-Q100 qualification; SOIC-8 package. | Preferred for precision low-noise instrumentation where high drive strength is unnecessary. | Select OPA2376AIDR only when automotive qualification is not required and output current demand stays below ±50mA. |
| AD8676ARZ | Higher precision (50µV VOS), lower noise (2.8nV/√Hz), but limited output current (±30mA) and no unlimited capacitive load support. | Suitable for metrology-grade DC-coupled amplifiers, not for capacitive load or power device driving. | Choose AD8676ARZ for ultra-low-offset, low-noise DC applications - avoid where >±30mA drive or capacitive stability is needed. |
Compared with OPA2376AIDR and AD8676ARZ, LM7321MA/NOPB uniquely combines automotive qualification, ±125mA drive, and unlimited capacitive load tolerance - making it irreplaceable in high-reliability power interface and sensor excitation roles where those three attributes intersect.
Availability
LM7321MA/NOPB is available at Aetrix Electronics and suitable for automotive battery management, industrial motor control, and medical sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM7321MA/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-reliability op amp design and automotive qualification.
The LM732xx product line was engineered specifically for demanding power interface and sensor signal conditioning applications - emphasizing drive strength, supply flexibility, and robustness in automotive and industrial environments.
FAQ
What is the maximum capacitive load the LM7321MA/NOPB can drive without external compensation?
The LM7321MA/NOPB is explicitly designed to drive unlimited capacitive loads without oscillation or instability - a feature confirmed in TI's datasheet Figure 5-31 and Section 6.4.1. This eliminates the need for series isolation resistors when driving ADC inputs, LCD column lines, or long PCB traces, simplifying layout and reducing component count. The LM7321MA/NOPB achieves this via internal compensation optimized for high-current output stages.
Is LM7321MA/NOPB qualified for automotive applications?
Yes, LM7321MA/NOPB is AEC-Q100 Grade 1 qualified, meaning it is tested and certified for operation from −40°C to +125°C ambient temperature - meeting requirements for engine compartment and powertrain electronics. This qualification covers thermal cycling, humidity testing, and lifetime reliability validation per automotive standards, making LM7321MA/NOPB suitable for battery monitoring, EPS, and ADAS subsystems.
What is the input common-mode voltage range of LM7321MA/NOPB?
The LM7321MA/NOPB features a true rail-to-rail input stage with common-mode range extending 0.1V beyond both supply rails: (V−) − 0.1V to (V+) + 0.1V. This allows direct connection to ground-referenced sensors in high-side configurations or to signals exceeding the supply - critical for accurate current sensing and photodiode biasing. The specification is guaranteed over full temperature and supply range.
Can LM7321MA/NOPB operate from a single 3.3V supply?
Yes, LM7321MA/NOPB is fully specified down to 2.7V total supply voltage - including single 3.3V operation. At 3.3V, it maintains rail-to-rail input/output swing, 12nV/√Hz input voltage noise, and ±60mA output current (per datasheet Section 5.5). Its parameters remain stable across supply voltage, making LM7321MA/NOPB ideal for battery-powered portable instrumentation and low-voltage industrial controls.
What package type is used for LM7321MA/NOPB?
LM7321MA/NOPB is packaged in an 8-pin SOIC (D) outline measuring 4.90mm × 3.90mm, with standard JEDEC MS-012AC dimensions. This surface-mount package supports automated assembly, offers good thermal performance (θJA = 133.5°C/W), and is pin-compatible with numerous industry-standard op amps - facilitating drop-in replacement in existing designs where electrical specs align.
LM7321MA/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM7321MA/NOPB FAQ
1.How can I place an order for LM7321MA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM7321MA/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 LM7321MA/NOPB reliable?
The price and inventory of LM7321MA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM7321MA/NOPB is usually 5 days.
3.What payment methods are accepted for LM7321MA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM7321MA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM7321MA/NOPB?
LM7321MA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM7321MA/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 LM7321MA/NOPB?
For technical support, including LM7321MA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM7321MA/NOPB requirements.
6.How does Aetrix verify that LM7321MA/NOPB is sourced from the original manufacturer or authorized distributors?
All LM7321MA/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 LM7321MA/NOPB meets industry standards.
7.What is the process for return or replacement of LM7321MA/NOPB?
All LM7321MA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM7321MA/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 LM7321MA/NOPB part is unused and in its original packaging.
Return procedure for LM7321MA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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