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Texas Instruments LMH6640MFX
- Part No.:
- LMH6640MFX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMH6640MFX.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,223
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Product details
Overview
LMH6640MFX from Texas Instruments (formerly National Semiconductor) is a single, rail-to-rail output voltage-feedback operational amplifier optimized for TFT-LCD VCOM buffering. It delivers ±100 mA linear output current, 190 MHz −3 dB bandwidth at 16 V supply, and 170 V/µs slew rate while consuming only 4 mA quiescent current - enabling high-fidelity video signal conditioning in space-constrained portable displays.
For engineers reviewing the LMH6640MFX datasheet, LMH6640MFX pinout, LMH6640MFX application, or LMH6640MFX equivalent, key selection criteria include its 100 mV rail-to-rail output swing, 0.12% differential gain/0.12° differential phase at 5 MHz, and validated stability driving 200 nF capacitive loads under unity-gain conditions - critical for TFT panel timing integrity and power efficiency.
Technical Context
The LMH6640MFX employs National's VIP10 bipolar process to achieve simultaneous high speed and high output current. Its input common-mode range extends from −0.3 V below V− to within 0.9 V of V+, supporting true single-supply operation across 4.5–16 V. The amplifier maintains stability at AV = +1 with no phase reversal when CMVR is exceeded.
It features fully characterized performance at both 5 V and 16 V supplies, with closed-loop output resistance of 0.35 Ω at 1 MHz and THD of −64 dBc at 5 MHz (2 VPP). The device drives 150 Ω video loads with <0.13% differential gain error and <0.12° differential phase shift - meeting NTSC video fidelity requirements without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 16 V - supports both low-voltage portable and high-voltage industrial display systems |
| −3 dB Bandwidth (AV = +1) | 190 MHz at 16 V - enables full-power video bandwidth up to 28 MHz (2 VPP, −1 dB) |
| Slew Rate | 170 V/µs - ensures fast settling (35 ns, ±0.1%, 2 VPP) for high-resolution TFT frame updates |
| Rail-to-Rail Output Swing | Within 100 mV of either rail - maximizes dynamic range in 3.3 V or 5 V single-supply designs |
| Output Current (Linear) | ±100 mA - directly drives heavy capacitive VCOM loads (up to 200 nF) without external buffers |
| Differential Gain / Phase | 0.12% / 0.12° at 5 MHz, RL = 150 Ω - meets broadcast-grade video signal fidelity standards |
| Input Common-Mode Range | −0.3 V to 15.1 V at 16 V supply - allows ground-referenced inputs in single-supply configurations |
Pinout & Package
LMH6640MFX is housed in a 5-pin SOT-23 package (NSC drawing MF05A), optimized for high-density PCB layouts in portable display modules. Thermal resistance is 265 °C/W, requiring minimal copper area for thermal management in battery-powered applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier Output | Delivers ±100 mA into capacitive VCOM loads; rail-to-rail swing enables full utilization of supply headroom |
| 2 (−IN) | Inverting Input | High-impedance node for feedback network connection; supports unity-gain stable configurations |
| 3 (+IN) | Non-Inverting Input | Accepts DC-biased VCOM reference; common-mode range includes ground at 16 V supply |
| 4 (V−) | Negative Supply | Ground reference in single-supply operation; supports −0.3 V input common-mode extension |
| 5 (V+) | Positive Supply | 16 V max rating; enables direct interface with TFT panel logic supplies without regulation |
Key Features
| Feature | Design Value |
|---|---|
| No output phase reversal | Guaranteed stability even when input exceeds common-mode limits - eliminates latch-up risk in VCOM transients |
| Fully characterized at 5 V & 16 V | Validated performance across portable (3.3/5 V) and industrial (12/16 V) supply rails - reduces design requalification effort |
| Low 65 mW power dissipation | Enables thermally constrained TFT module designs without heatsinking or derating |
| 0.12% differential gain error | Preserves color accuracy in NTSC/PAL video signals without post-processing correction |
| 100 nA max input offset current | Minimizes DC drift in high-impedance VCOM bias networks over temperature and time |
Applications
| TFT Panel VCOM Buffer | ADC Front-End Buffer |
|---|---|
|
Use Scenario: Driving the common voltage (VCOM) node of an active-matrix LCD panel with bi-directional current into 50–200 nF capacitive load. IC Role / Device Role / Timing Role: High-current, unity-gain buffer maintaining precise DC level while sourcing/sinking transient currents during pixel charging. Use Value: Eliminates need for external MOSFET drivers; 35 ns settling ensures accurate gray-scale reproduction across full resolution. |
Use Scenario: Isolating and scaling analog sensor outputs before 12-bit+ successive-approximation ADC sampling. IC Role / Device Role / Timing Role: Low-noise, fast-settling driver providing 100 mA peak current to charge ADC input capacitance without droop. Use Value: Achieves ±0.1% settling in 35 ns, preserving ENOB in high-speed data acquisition systems operating up to 28 MSPS. |
| Portable Video Signal Chain | Current Sense Amplifier |
|
Use Scenario: Amplifying composite video (CVBS) or RGB signals in handheld media players with battery-limited 3.3 V supply. IC Role / Device Role / Timing Role: Rail-to-rail output stage delivering 2 VPP signal into 75 Ω coaxial cable with <0.13% differential gain error. Use Value: Maintains broadcast-compatible video fidelity without external level-shifting or gain stages - reducing BOM count by one IC. |
Use Scenario: Amplifying mV-level shunt voltage drops in motor control or power supply current monitoring circuits. IC Role / Device Role / Timing Role: Precision buffer with 1 mV typical input offset and 0.35 Ω closed-loop output resistance for low-impedance drive. Use Value: Enables accurate 1% current measurement over 4.5–16 V supply range without calibration drift from rail-dependent errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-output-current op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS3201DR | Higher 300 MHz bandwidth but 12 mA supply current; requires dual supply for full rail-to-rail input | Better suited for RF/IF signal chains than DC-coupled VCOM buffering | Select when >200 MHz small-signal bandwidth is required and power budget allows ≥3× higher quiescent draw |
| OPA690U | 120 mA output current, 500 MHz GBW, but only 1.5 V output swing from rails at 5 V supply | Limited dynamic range in low-voltage portable designs; not validated for 200 nF capacitive loads | Prefer for wideband AC-coupled amplification where rail-to-rail swing is non-critical |
Compared with THS3201DR and OPA690U, the LMH6640MFX uniquely balances 190 MHz bandwidth, ±100 mA output, 100 mV rail-to-rail swing, and 4 mA quiescent current in a 5-pin SOT-23 - making it the only option qualified for battery-powered TFT VCOM buffering with NTSC-grade video fidelity.
Availability
LMH6640MFX is available at Aetrix Electronics and suitable for TFT-LCD panel manufacturing, portable video equipment design, and high-speed data acquisition systems requiring stable component supply with guaranteed long-term availability.
Supply support for LMH6640MFX 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 acquired National Semiconductor in 2011 and maintains full technical and supply chain continuity for legacy high-performance analog products like the LMH6640MFX.
The LMH™ series was developed specifically for high-speed, high-output-current applications in display electronics and video infrastructure - prioritizing rail-to-rail operation, capacitive load drive, and video-grade distortion performance.
FAQ
What is the maximum capacitive load the LMH6640MFX can drive stably in unity-gain configuration?
The LMH6640MFX is validated to drive up to 200 nF capacitive loads stably in unity-gain configuration, as demonstrated in its TFT VCOM application circuit with 209 nF simulated load and 54 Ω series resistance. This capability eliminates the need for isolation resistors or external compensation networks in display panel designs.
Does the LMH6640MFX support true single-supply operation with input referenced to ground?
Yes, the LMH6640MFX supports true single-supply operation: its input common-mode voltage range extends to −0.3 V below V− (ground) and to within 0.9 V of V+, enabling ground-referenced inputs at 16 V supply. This allows direct interface with DAC outputs or resistor-divider references without level-shifting circuitry.
What is the guaranteed output current capability of the LMH6640MFX at 16 V supply?
At 16 V supply, the LMH6640MFX guarantees ±100 mA linear output current into loads where the output voltage remains within 0.5 V of either rail. Short-circuit current is specified at 60 mA sourcing and 50 mA sinking under continuous test conditions - sufficient for driving large-area TFT VCOM nodes.
How does the LMH6640MFX achieve NTSC-compliant video performance?
The LMH6640MFX achieves NTSC compliance through measured 0.12% differential gain and 0.12° differential phase error at 5 MHz into 150 Ω loads - results verified across temperature and supply voltage. Its low 170 V/µs slew rate and optimized feedback architecture suppress harmonic distortion to −64 dBc, preserving color fidelity without post-processing.
Is the LMH6640MFX pin-compatible with other SOT-23 op-amps for drop-in replacement?
No documented pin-compatible replacements exist for the LMH6640MFX in the SOT-23-5 footprint. While pinout matches standard single-op-amp SOT-23 layouts (V+, OUT, −IN, +IN, V−), its combination of 190 MHz bandwidth, ±100 mA output, and rail-to-rail swing is unique - requiring full electrical validation if substituting with alternatives like THS3201DR or OPA690U.
LMH6640MFX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 170V/µs
- Gain Bandwidth Product:
- 62 MHz
- -3db Bandwidth:
- 190 MHz
- Current - Input Bias:
- 1 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 4mA
- Current - Output / Channel:
- 100 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 16 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LMH6640MFX FAQ
1.How can I place an order for LMH6640MFX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6640MFX 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 LMH6640MFX reliable?
The price and inventory of LMH6640MFX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6640MFX is usually 5 days.
3.What payment methods are accepted for LMH6640MFX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6640MFX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6640MFX?
LMH6640MFX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6640MFX 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 LMH6640MFX?
For technical support, including LMH6640MFX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6640MFX requirements.
6.How does Aetrix verify that LMH6640MFX is sourced from the original manufacturer or authorized distributors?
All LMH6640MFX 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 LMH6640MFX meets industry standards.
7.What is the process for return or replacement of LMH6640MFX?
All LMH6640MFX units undergo pre-shipment inspection (PSI). If there is an issue with LMH6640MFX, 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 LMH6640MFX part is unused and in its original packaging.
Return procedure for LMH6640MFX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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