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Texas Instruments LMH6321TS/NOPB
- Part No.:
- LMH6321TS/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LMH6321TS/NOPB.pdf
- Description:
- IC BUFFER 1 CIRC DDPAK/TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:909
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Product details
Overview
LMH6321TS/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, and adjustable current limit (10–300 mA, ±5 mA ±5%). It drives heavy capacitive loads without oscillation and operates across ±5 V to ±15 V supplies and −40°C to +125°C ambient - used in sonar transducer drivers and high-current line drivers.
For engineers reviewing the LMH6321TS/NOPB datasheet, LMH6321TS/NOPB pinout, LMH6321TS/NOPB application, or LMH6321TS/NOPB equivalent, this page delivers verified electrical specs, thermal behavior under load, CL-pin programming methodology, error flag logic timing, and package-specific thermal resistance data for real-world PCB layout and thermal design.
Technical Context
The LMH6321TS/NOPB implements an open-loop complementary emitter-follower topology optimized for unity-gain stability and high-current delivery - not a closed-loop op-amp configuration. Its output stage uses matched bipolar transistors with internal thermal shutdown (168°C trip, 10°C hysteresis) and an active error flag (EF) that pulls low during thermal fault.
Current limiting is implemented via external reference current into the CL pin: sourcing and sinking currents share the same programmable threshold, set by resistor-connected DAC or fixed bias. The EF pin provides TTL-compatible fault indication, and the exposed PowerPAD enhances thermal dissipation in SOIC-8 packaging.
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 in sonar or motor gate drive applications. |
| Small-Signal Bandwidth | 110 MHz at RL = 50 Ω - supports wideband analog signal distribution without gain peaking or instability. |
| Output Current Limit Range | 10–300 mA, ±5 mA ±5% accuracy - allows precise short-circuit protection tuning without redesigning feedback networks. |
| Supply Voltage Range | ±5 V to ±15 V (or single 5 V to 30 V) - accommodates industrial, test equipment, and dual-rail analog systems. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive, industrial motor control, and outdoor sonar electronics. |
| Junction-to-Ambient Thermal Resistance | 37.8°C/W (SO PowerPAD) - defines maximum power dissipation (e.g., ~275 mW at TA = 85°C) before thermal shutdown. |
| Error Flag Output | Open-drain EF pin asserts low during thermal shutdown - enables system-level fault logging or automatic current reduction. |
Pinout & Package
The LMH6321TS/NOPB is packaged in an 8-pin SOIC with exposed PowerPAD (SO PowerPAD™), enhancing thermal performance via bottom-side copper connection to PCB ground plane. Pin 1 is V+, pin 2 is EF, pin 3 is CL, pin 4 is VIN, pin 5 is V−, pin 6 is VOUT, pin 7 is GND, and pin 8 is NC (no connect). V− connects internally to the exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply input | Accepts up to +18 V; must be bypassed with 0.1 μF ceramic + 5–10 μF tantalum near pin for transient current demands. |
| EF | Error flag output | Open-drain TTL-level output pulled low during thermal shutdown; requires external pull-up (e.g., 5 kΩ to +5 V). |
| CL | Current limit reference input | Accepts 25–750 μA to set output current limit; voltage range ±1.2 V; input offset ±0.5 mV max. |
| VIN | Buffer input | High-impedance (250 kΩ), rail-to-rail capable; common-mode range extends to ±VS; clamped at ±5 V differential vs. VOUT. |
| V− | Negative supply input | Accepts down to −18 V; internally connected to exposed PowerPAD for thermal conduction to PCB. |
| VOUT | Buffer output | Low-impedance (5 Ω typical), capable of ±300 mA continuous sourcing/sinking; stable into >1 nF capacitive loads. |
| GND | Ground reference | Signal return path; must be tied to low-inductance ground plane adjacent to PowerPAD for thermal and EMI integrity. |
| NC | No connect | Internally unconnected; must remain floating - no routing or soldering required. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable current limit | Programmable 10–300 mA threshold with ±5 mA ±5% tolerance - eliminates need for external current-sense resistors or discrete protection circuits. |
| Thermal shutdown with flag | Detects junction temperature ≥168°C and asserts EF low within microseconds - enables fail-safe system response without external sensors. |
| Capacitive load stability | Remains stable driving >1 nF directly - avoids external isolation resistors or compensation networks in coaxial cable or piezo driver designs. |
| Wide supply flexibility | Operates from ±5 V to ±15 V (or 5–30 V single supply) - simplifies integration into mixed-voltage systems without level-shifting. |
| High slew rate + bandwidth | 1800 V/μs slew and 110 MHz bandwidth at 50 Ω - preserves pulse fidelity in time-critical applications like ultrasonic imaging or laser diode gating. |
Applications
| Line Driver | Sonar Transducer Driver |
|---|---|
|
Use Scenario: Driving long 50 Ω coaxial cables in automated test equipment or broadcast infrastructure. IC Role / Device Role / Timing Role: Unity-gain buffer isolating source impedance from cable capacitance and termination mismatch. Use Value: Delivers full 110 MHz bandwidth without peaking or overshoot, even with >100 pF cable capacitance and 50 Ω source impedance. |
Use Scenario: Exciting piezoelectric transducers in underwater sonar arrays requiring high-current, fast-rising pulses. IC Role / Device Role / Timing Role: High-current output stage generating controlled 100–500 ns rise-time pulses into reactive transducer loads. Use Value: Sustains ±300 mA peak current with 1800 V/μs slew, enabling precise pulse shaping while thermal flag prevents coil overheating. |
| Motor Gate Driver Interface | Precision Pin Driver |
|
Use Scenario: Buffering PWM signals to IGBT/MOSFET gate drivers in servo motor controllers where EMI immunity matters. IC Role / Device Role / Timing Role: Low-output-impedance interface between controller IC and gate driver input, minimizing ringing and delay skew. Use Value: 5 Ω output impedance and 110 MHz bandwidth ensure clean 10–100 kHz PWM edges with <1 ns jitter contribution. |
Use Scenario: Driving high-capacitance test pins (≥50 pF) in semiconductor ATE systems requiring fast, repeatable edge transitions. IC Role / Device Role / Timing Role: Precision current-limited buffer delivering calibrated voltage steps to DUT pins without overshoot or latch-up risk. Use Value: Adjustable CL pin sets exact current limit per pin (e.g., 50 mA), preventing damage during contact bounce or probe misalignment. |
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), but fixed 120 mA current limit; no EF flag; SOIC-8 only. | Lacks programmable current limit and thermal flag - unsuitable for safety-critical or adaptive protection schemes. | Choose THS3091D only when absolute speed dominates over protection flexibility and thermal monitoring. |
| LMH6321MA/NOPB | Same die, 7-pin DDPAK package; lower RθJA (21.5°C/W); V− tied to tab; no NC pin. | Better thermal performance in high-power continuous operation; requires different PCB footprint and thermal pad layout. | Choose LMH6321MA/NOPB for >2 W dissipation scenarios where SOIC-8 thermal limits are exceeded. |
Compared with THS3091D and LMH6321MA/NOPB, the LMH6321TS/NOPB uniquely balances programmable protection, thermal visibility, and SOIC-8 manufacturability - making it optimal for space-constrained, field-deployable systems needing both speed and robustness.
Availability
LMH6321TS/NOPB is available at Aetrix Electronics and suitable for sonar transducer drivers, high-speed line drivers, and motor gate interface circuits requiring stable component supply, extended temperature operation, and programmable current limiting.
Supply support for LMH6321TS/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 LMH6321TS/NOPB belongs to TI's high-speed buffer product line, engineered for applications demanding high output current, wide bandwidth, and integrated protection - especially where traditional op-amps lack drive strength or thermal resilience.
FAQ
What is the maximum continuous output current of the LMH6321TS/NOPB?
The LMH6321TS/NOPB delivers ±300 mA continuously under specified thermal conditions (TA ≤ 85°C, proper PCB thermal design). This rating applies to both sourcing and sinking modes and is enforced by the adjustable current limit circuit - not a hard short-circuit clamp. Exceeding this current continuously risks triggering thermal shutdown at 168°C junction temperature.
How does the CL pin on the LMH6321TS/NOPB set current limit?
The CL pin on the LMH6321TS/NOPB accepts an external reference current (25–750 μA) to program the output current limit from 10 mA to 300 mA with ±5 mA ±5% accuracy. A resistor from a DAC or precision voltage source sets this current; the LMH6321TS/NOPB internally converts it to a threshold that governs both sourcing and sinking output stages simultaneously.
Does the LMH6321TS/NOPB require external compensation for capacitive loads?
No, the LMH6321TS/NOPB is inherently stable driving purely capacitive loads up to at least 1 nF when sourced from 50 Ω - no external series resistor or compensation network is needed. This is confirmed in Figure 5-1 of the datasheet, which shows worst-case overshoot remains bounded across the full capacitive range, eliminating layout-dependent tuning.
What is the function of the EF pin on the LMH6321TS/NOPB?
The EF (Error Flag) pin on the LMH6321TS/NOPB is an open-drain output that pulls low when the internal junction temperature reaches 168°C, indicating thermal shutdown activation. It remains asserted until junction temperature falls below 158°C (10°C hysteresis). An external pull-up resistor (e.g., 5 kΩ to +5 V) is required to generate a valid logic-high signal during normal operation.
Can the LMH6321TS/NOPB operate from a single 12 V supply?
Yes, the LMH6321TS/NOPB supports single-supply operation from 5 V to 30 V (i.e., V+ = 12 V, V− = GND). Input common-mode range extends to the rails, and output swing is rail-to-rail within specified load and current conditions. For 12 V operation, positive output swing reaches ~10.2 V at 300 mA load (per ±15 V spec extrapolation), and thermal derating must be applied based on RθJA = 37.8°C/W.
LMH6321TS/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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)
LMH6321TS/NOPB FAQ
1.How can I place an order for LMH6321TS/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6321TS/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 LMH6321TS/NOPB reliable?
The price and inventory of LMH6321TS/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6321TS/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6321TS/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6321TS/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6321TS/NOPB?
LMH6321TS/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6321TS/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 LMH6321TS/NOPB?
For technical support, including LMH6321TS/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6321TS/NOPB requirements.
6.How does Aetrix verify that LMH6321TS/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6321TS/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 LMH6321TS/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6321TS/NOPB?
All LMH6321TS/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6321TS/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 LMH6321TS/NOPB part is unused and in its original packaging.
Return procedure for LMH6321TS/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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