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Texas Instruments LMH6321TSX/NOPB
- Part No.:
- LMH6321TSX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LMH6321TSX/NOPB.pdf
- Description:
- IC BUFFER 1 CIRC DDPAK/TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:2,397
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Product details
Overview
LMH6321TSX/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 or pin driver in high-current analog signal paths.
For engineers reviewing the LMH6321TSX/NOPB datasheet, LMH6321TSX/NOPB pinout, LMH6321TSX/NOPB application, or LMH6321TSX/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 under sustained 300 mA load.
Technical Context
The LMH6321TSX/NOPB uses an open-loop complementary emitter-follower topology optimized for unity-gain stability and minimal propagation delay. Its current-limit circuitry shares sourcing and sinking limits set by an external reference current applied to the CL pin via resistor or DAC.
It operates across −40°C to +125°C with ±5 V to ±15 V supplies and delivers stable performance into 50 Ω resistive or large capacitive loads without oscillation. The EF pin asserts low during thermal shutdown (TJ = 168°C, 10°C hysteresis), enabling system-level fault monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 1800 V/μs at ±15 V, RL = 50 Ω - enables fast settling of high-amplitude pulses without distortion in time-critical drivers. |
| Small-Signal Bandwidth | 110 MHz at RL = 50 Ω - supports broadband analog signal distribution up to UHF frequencies. |
| Output Current Limit Range | 10–300 mA, adjustable via CL pin - allows dynamic current tailoring for varying load demands without hardware change. |
| Current Limit Accuracy | ±5 mA ±5% - ensures predictable short-circuit protection and consistent drive capability across temperature. |
| Supply Voltage Range | ±5 V to ±15 V (36 V total) - accommodates industrial, test equipment, and motor control rails without level-shifting. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and harsh-environment sonar systems. |
| Error Flag Output | Open-drain EF pin pulls low at TJ ≥ 168°C - provides direct microcontroller interrupt signaling for thermal fault recovery. |
Pinout & Package
LMH6321TSX/NOPB is packaged in an 8-pin SO PowerPAD™ (SOIC-8 with exposed thermal pad). The exposed copper pad on the bottom improves heat dissipation and must be soldered to a PCB thermal plane for rated 300 mA continuous operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V+) | Positive supply rail | Accepts +5 V to +15 V; connects internally to tab in DDPAK variant - requires low-inductance bypassing near pin. |
| 2 (EF) | Error flag output | Open-drain output active-low during thermal shutdown; requires external pull-up (e.g., 5 kΩ to +5 V) for logic-level interfacing. |
| 3 (CL) | Current limit reference input | Accepts external current (25 µA–750 µA) to set output limit; bias current <0.8 µA enables precise DAC-based programming. |
| 4 (VIN) | Inverting input / buffer input | High-impedance node (250 kΩ); configured as unity-gain follower - input common-mode range extends to rails. |
| 5 (V−) | Negative supply rail | Accepts −5 V to −15 V; connects internally to tab in DDPAK variant - must be decoupled independently from V+. |
| 6 (VOUT) | Buffer output | Low-impedance source/sink capable of ±300 mA; stable into >1 nF capacitance when driven from 50 Ω source. |
| 7 (GND) | Analog ground reference | Return path for CL pin and internal bias networks; must be tied to low-noise ground plane, separate from power ground if possible. |
| 8 (NC) | No connect | Unbonded pin - left floating; no electrical function or thermal role. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable current limit | 10–300 mA set via external current on CL pin, with ±5 mA ±5% tolerance - eliminates need for discrete current-sense resistors or external limiters. |
| Thermal shutdown with flag | EF pin asserts low at 168°C junction temperature with 10°C hysteresis - enables fail-safe system response without external thermal sensors. |
| Capacitive load drive | Stable into unlimited capacitive loads when driven from 50 Ω source - removes need for series isolation resistors in coaxial cable or piezo driver applications. |
| Wide supply range | Operates from ±5 V to ±15 V - supports dual-rail instrumentation and single-supply configurations using virtual ground techniques. |
| High slew rate & bandwidth | 1800 V/μs slew and 110 MHz bandwidth at 50 Ω - preserves edge fidelity in pulse amplification, ultrasonic transducer excitation, and high-speed test fixtures. |
Applications
| Line Driver | Pin Driver |
|---|---|
|
Use Scenario: Driving long 50 Ω coaxial cables in automated test equipment (ATE) with fast digital pulses or analog waveforms. IC Role / Device Role / Timing Role: Unity-gain buffer isolating FPGA/DAC output from cable impedance mismatch and reflections. Use Value: 1800 V/μs slew ensures sub-10 ns edge preservation; adjustable current limit prevents damage during connector hot-plug or cable shorts. |
Use Scenario: Providing high-current gate drive or sensor excitation signals in semiconductor automatic handlers. IC Role / Device Role / Timing Role: High-speed pin-level buffer delivering ±300 mA to DUT pins with minimal propagation delay. Use Value: Open-loop architecture yields <1 ns propagation delay; thermal flag alerts handler controller before die overheating occurs. |
| Sonar Transducer Driver | Motor Control Current Booster |
|
Use Scenario: Exciting piezoelectric transducers in underwater imaging systems with bipolar high-voltage pulses. IC Role / Device Role / Timing Role: High-current voltage follower amplifying DAC output to drive reactive transducer loads. Use Value: Stable into >10 nF capacitance; 110 MHz bandwidth supports clean 1–5 MHz chirp generation without peaking or ringing. |
Use Scenario: Boosting op-amp output current in closed-loop motor phase current sensing or PWM gate drive stages. IC Role / Device Role / Timing Role: Standalone current booster placed inside feedback loop of precision current regulator. Use Value: Adjustable current limit protects MOSFETs during overcurrent events; ±300 mA sourcing/sinking matches typical gate charge requirements. |
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, SO-8 package only | Lacks programmable current limit and thermal flag - less suitable for adaptive protection or fault-aware systems | Prefer THS3091D when maximum speed is critical and current limit can be fixed; avoid where thermal monitoring is required. |
| LMH6321MD | Same silicon, 7-pin DDPAK package with higher thermal performance (RθJA = 21.5°C/W vs. 37.8°C/W), same pinout except V− connected to tab | Better suited for continuous 300 mA operation in space-constrained industrial modules due to lower thermal resistance | Choose LMH6321MD for thermally demanding layouts; LMH6321TSX/NOPB preferred when SOIC-8 footprint and reflow compatibility are mandatory. |
Compared with THS3091D and LMH6321MD, LMH6321TSX/NOPB uniquely combines programmable current limiting, thermal flag signaling, and SO PowerPAD™ thermal management in a standard SOIC-8 footprint - making it optimal for ATE, sonar, and motor control designs requiring both adaptability and reliability.
Availability
LMH6321TSX/NOPB is available at Aetrix Electronics and suitable for line driver, pin driver, sonar transducer driver, and motor control current booster applications requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing.
Supply support for LMH6321TSX/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 high-performance signal chain solutions for industrial, automotive, and communications markets.
The LMH6321TSX/NOPB belongs to TI's high-speed buffer product line, designed specifically for applications demanding robust current drive, programmable protection, and thermal intelligence in compact packages.
FAQ
What is the maximum continuous output current of the LMH6321TSX/NOPB?
The LMH6321TSX/NOPB delivers ±300 mA continuously when properly heatsinked via its SO PowerPAD™ exposed pad. This rating assumes operation within the full −40°C to +125°C temperature range and adequate PCB copper area under the thermal pad. Exceeding this current without adjusting the CL pin will trigger thermal shutdown.
How does the current limit function on the LMH6321TSX/NOPB work?
The LMH6321TSX/NOPB uses an external current applied to the CL pin to set its output current limit between 10 mA and 300 mA. A 750 µA reference current yields ~300 mA limit with ±5 mA ±5% accuracy. The sourcing and sinking currents share the same limit value, and the CL pin bias current remains below 0.8 µA to minimize programming error.
Does the LMH6321TSX/NOPB require external compensation for stability?
No, the LMH6321TSX/NOPB is internally compensated for unity-gain stability and remains stable into any capacitive load when driven from a 50 Ω source. Its open-loop complementary follower architecture eliminates phase-margin concerns common in op-amp-based buffers, removing the need for external compensation networks.
What is the purpose of the EF pin on the LMH6321TSX/NOPB?
The EF (Error Flag) pin on the LMH6321TSX/NOPB is an open-drain output that pulls low when the junction temperature reaches 168°C, indicating thermal shutdown activation. It features 10°C hysteresis and requires an external pull-up resistor (e.g., 5 kΩ to +5 V) to interface with microcontrollers or FPGA GPIO for real-time thermal fault detection.
Can the LMH6321TSX/NOPB operate from a single supply?
Yes, the LMH6321TSX/NOPB supports single-supply operation (e.g., +10 V and GND) by referencing VIN and VOUT to a stable virtual ground. Input common-mode range extends to the rails, and output swing remains symmetrical around the virtual ground. However, full ±300 mA performance requires adequate headroom - consult Section 6.10 of the datasheet for biasing guidance.
LMH6321TSX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- 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:
- TO-263 (DDPAK-7)
LMH6321TSX/NOPB FAQ
1.How can I place an order for LMH6321TSX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6321TSX/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 LMH6321TSX/NOPB reliable?
The price and inventory of LMH6321TSX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6321TSX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6321TSX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6321TSX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6321TSX/NOPB?
LMH6321TSX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6321TSX/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 LMH6321TSX/NOPB?
For technical support, including LMH6321TSX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6321TSX/NOPB requirements.
6.How does Aetrix verify that LMH6321TSX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6321TSX/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 LMH6321TSX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6321TSX/NOPB?
All LMH6321TSX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6321TSX/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 LMH6321TSX/NOPB part is unused and in its original packaging.
Return procedure for LMH6321TSX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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