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Texas Instruments LMH6321MRX/NOPB
- Part No.:
- LMH6321MRX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6321MRX/NOPB.pdf
- Description:
- IC BUFFER 1 CIRCUIT 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:1,030
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Product details
Overview
LMH6321MRX/NOPB from Texas Instruments is a high-speed unity-gain buffer IC with 1800 V/μs slew rate, 110 MHz small-signal bandwidth, ±300 mA continuous output current, adjustable current limit (10–300 mA), and thermal shutdown error flag. It drives heavy capacitive loads stably and serves as a line/pin driver in sonar and motor control systems.
For engineers reviewing the LMH6321MRX/NOPB datasheet, LMH6321MRX/NOPB pinout, LMH6321MRX/NOPB application, or LMH6321MRX/NOPB equivalent, key selection criteria include programmable current limiting accuracy (±5 mA ±5%), wide supply range (±5 V to ±15 V), thermal flag behavior, and SO PowerPAD™ package thermal performance.
Technical Context
The LMH6321MRX/NOPB implements an open-loop complementary emitter-follower topology optimized for unity-gain stability and high-current drive. Its current-limiting function operates via external reference current injection into the CL pin, enabling real-time adjustment without feedback loop disruption.
Thermal shutdown activates at 168°C junction temperature with 10°C hysteresis, and the EF pin asserts low during fault. The device maintains stable operation driving ≥1 nF capacitive loads with a 50 Ω source, and supports single- or dual-supply configurations across −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 1800 V/μs at ±15 V, RL = 50 Ω - enables fast transient response in pulse-driven applications like sonar transmitters. |
| Small-Signal Bandwidth | 110 MHz at RL = 50 Ω - supports high-fidelity signal transmission up to UHF frequencies in coaxial line drivers. |
| Output Current Limit Range | 10–300 mA, set by external CL pin current - allows precise, field-adjustable short-circuit protection without hardware change. |
| Current Limit Accuracy | ±5 mA ±5% - ensures predictable fault current threshold across temperature and supply voltage variations. |
| Supply Voltage Range | ±5 V to ±15 V (or 5 V single-ended) - accommodates industrial and test equipment rails without level-shifting circuitry. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive, industrial motor control, and downhole sonar environments. |
| Error Flag Output | EF pin pulls low during thermal shutdown - provides direct logic-level fault signaling to microcontrollers or FPGA I/O. |
Pinout & Package
The LMH6321MRX/NOPB is packaged in an 8-pin SO PowerPAD™ with exposed thermal pad on the underside for enhanced heat dissipation. Pin 1 is V+, pin 2 is EF (error flag), pin 3 is CL (current limit input), pin 4 is VIN (input), pin 5 is V−, pin 6 is VOUT (output), pin 7 is GND, and pin 8 is NC (no connect). The V− pin connects internally to the exposed thermal tab.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply rail | Accepts up to +15 V; must be bypassed with 0.1 μF ceramic + 5–10 μF tantalum for high di/dt stability. |
| EF | Error flag output | Open-drain logic-low output during thermal shutdown; requires external pull-up to system logic voltage. |
| CL | Current limit reference input | Accepts 25–750 μA to set output current limit; accuracy depends on external resistor tolerance and layout. |
| VIN | Buffer input | High-impedance (250 kΩ) node; requires series resistor for overvoltage protection if input-output differential exceeds ±5 V. |
| V− | Negative supply rail / thermal tab | Internally connected to exposed pad; must be soldered to PCB copper pour for thermal management. |
| VOUT | Buffer output | Low-impedance (5 Ω typical) drive capable of ±300 mA continuously; stable into >1 nF capacitive load. |
| GND | Analog ground reference | Return path for CL pin bias and internal circuitry; should be tied directly to power ground plane. |
| NC | No connect | Unbonded pin; must remain unconnected and unpopulated on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable current limit | Externally programmable from 10 mA to 300 mA with ±5 mA ±5% tolerance - eliminates need for discrete current-sense resistors or external protection ICs. |
| High capacitive load drive | Stable with ≥1 nF load when driven from 50 Ω source - enables direct connection to long cables or piezoelectric transducers without isolation networks. |
| Thermal shutdown with flag | 168°C trip point with 10°C hysteresis and dedicated EF pin - provides deterministic fault reporting for system-level thermal management. |
| Wide supply range | Operates from ±5 V to ±15 V (or 5 V single-ended) - simplifies integration into legacy test equipment and mixed-rail industrial systems. |
| Open-loop complementary follower | Unity-gain architecture with no internal compensation - delivers higher bandwidth and lower propagation delay than closed-loop op-amp buffers. |
Applications
| Line Driver | PIN Driver |
|---|---|
Use Scenario: Driving 50 Ω coaxial cable runs in automated test equipment (ATE) with fast digital pulses. IC Role / Device Role / Timing Role: Unity-gain buffer isolating DAC output from reactive cable impedance while maintaining edge fidelity. Use Value: 1800 V/μs slew rate preserves <1 ns rise time; 110 MHz bandwidth supports multi-MHz data rates without roll-off. |
Use Scenario: Providing high-current gate drive to multiple MOSFETs in a multi-phase motor controller. IC Role / Device Role / Timing Role: High-current output stage delivering synchronized switching signals to parallel power stages. Use Value: ±300 mA sourcing/sinking capability ensures fast turn-on/turn-off; adjustable current limit protects against shoot-through faults. |
| Sonar Transmitter | Motor Control |
Use Scenario: Exciting piezoelectric transducers in underwater imaging systems with bipolar high-voltage pulses. IC Role / Device Role / Timing Role: High-slew, high-current buffer generating clean, undistorted transmit waveforms. Use Value: Stable into >1 nF capacitive load eliminates ringing; thermal flag prevents damage during repeated pulse bursts. |
Use Scenario: Driving analog sensor excitation circuits in servo amplifiers requiring precise current-limited outputs. IC Role / Device Role / Timing Role: Precision current-limited buffer supplying excitation to strain gauges or RTDs. Use Value: Programmable CL pin enables dynamic current scaling per sensor type; ±5 mA accuracy ensures repeatable calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS3091D | Higher slew rate (2750 V/μs), fixed 250 mA current limit, no EF flag, SOIC-8 package only | Lacks programmable current limit and thermal flag; better suited for ultra-fast pulse applications where protection is handled externally | Select THS3091D when maximum speed is critical and external current limiting is acceptable |
| LMH6321MRE/NOPB | Same die, 7-pin DDPAK package with larger thermal pad and different pinout (V− on tab, no NC pin) | Superior thermal resistance (RθJB = 6.7°C/W vs. 11.7°C/W), but requires different PCB footprint and layout | Select LMH6321MRE/NOPB for higher-power continuous operation where board space permits larger package |
Compared with THS3091D, LMH6321MRX/NOPB trades 950 V/μs slew for programmable current limiting and integrated thermal flag-critical for self-protecting motor and sonar drivers. Versus LMH6321MRE/NOPB, it offers identical electrical specs in a smaller SO PowerPAD™ footprint, sacrificing ~40% thermal performance for compactness.
Availability
LMH6321MRX/NOPB is available at Aetrix Electronics and suitable for line driver, sonar transmitter, motor control, and precision analog excitation applications requiring stable component supply, programmable protection, and high-speed current delivery.
Supply support for LMH6321MRX/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 power management technologies, with decades of expertise in high-performance amplifier design.
The LMH6321MRX/NOPB belongs to TI's high-speed buffer product line, engineered specifically for applications demanding robust current delivery, programmable fault protection, and stability into challenging reactive loads.
FAQ
What is the maximum continuous output current of the LMH6321MRX/NOPB?
The LMH6321MRX/NOPB delivers ±300 mA continuously when properly heatsinked. This rating assumes operation within the specified temperature range (−40°C to +125°C), adequate PCB copper area under the PowerPAD™, and supply voltages within ±5 V to ±15 V. Exceeding this current continuously without thermal mitigation will trigger thermal shutdown.
How does the CL pin on the LMH6321MRX/NOPB set the current limit?
The CL pin on the LMH6321MRX/NOPB accepts an external reference current (25–750 μA) that linearly sets the output current limit between 10 mA and 300 mA. A resistor from a voltage reference (e.g., DAC output or precision voltage source) to CL establishes this current. The LMH6321MRX/NOPB achieves ±5 mA ±5% accuracy across temperature and supply voltage.
Does the LMH6321MRX/NOPB require external compensation for stability?
No, the LMH6321MRX/NOPB is internally compensated for unity-gain stability and remains stable driving ≥1 nF capacitive loads with a 50 Ω source impedance. No external compensation components are needed. However, proper supply bypassing (0.1 μF ceramic + 5–10 μF tantalum) and low-inductance layout are essential for high-current transient stability.
What happens to the EF pin during thermal shutdown of the LMH6321MRX/NOPB?
During thermal shutdown, the EF pin on the LMH6321MRX/NOPB actively pulls low (≤0.25 V) with a sink capability of ≥3 mA. It remains low until junction temperature falls below the hysteresis threshold (≈158°C). An external pull-up resistor (e.g., 5 kΩ to +5 V) is required to establish a valid logic-high state during normal operation.
Can the LMH6321MRX/NOPB operate from a single 5 V supply?
Yes, the LMH6321MRX/NOPB supports single-supply operation from 5 V (V+ = 5 V, V− = GND). In this configuration, output swing is reduced: ±1.3 V at 300 mA load (RL = 50 Ω), and ±3.5 V at light load (RL = 1 kΩ). Input common-mode range extends from GND to V+ − 1.5 V, and CL pin functionality remains fully operational.
LMH6321MRX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Buffer
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2900V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 110 MHz
- Current - Input Bias:
- 2 µA
- Voltage - Input Offset:
- 4 mV
- Current - Supply:
- 14.9mA
- Current - Output / Channel:
- 295 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 32 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMH6321MRX/NOPB FAQ
1.How can I place an order for LMH6321MRX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6321MRX/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 LMH6321MRX/NOPB reliable?
The price and inventory of LMH6321MRX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6321MRX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6321MRX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6321MRX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6321MRX/NOPB?
LMH6321MRX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6321MRX/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 LMH6321MRX/NOPB?
For technical support, including LMH6321MRX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6321MRX/NOPB requirements.
6.How does Aetrix verify that LMH6321MRX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6321MRX/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 LMH6321MRX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6321MRX/NOPB?
All LMH6321MRX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6321MRX/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 LMH6321MRX/NOPB part is unused and in its original packaging.
Return procedure for LMH6321MRX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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