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Texas Instruments LMH6640MFX/NOPB
- Part No.:
- LMH6640MFX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMH6640MFX/NOPB.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,884
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Product details
Overview
LMH6640MFX/NOPB 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, operating from 4.5 V to 16 V with input common-mode range extending 0.3 V below V− and within 0.9 V of V+. It is used in high-current, low-voltage video signal conditioning where dynamic range and stability under heavy capacitive loads are critical.
For engineers reviewing the LMH6640MFX/NOPB datasheet, LMH6640MFX/NOPB pinout, LMH6640MFX/NOPB application, or LMH6640MFX/NOPB equivalent, key selection criteria include full-power bandwidth at 5 V/16 V, differential gain/phase performance for NTSC video, rail-to-rail output swing within 100 mV of rails, and verified stability in unity-gain VCOM buffer configurations driving >200 nF capacitive loads.
Technical Context
The LMH6640MFX/NOPB employs National's VIP10 bipolar process to achieve high-speed, high-output-current operation while maintaining DC precision. Its internal compensation ensures stable unity-gain performance without phase reversal-even when input common-mode voltage exceeds specified limits-and supports robust driving of reactive video loads up to 200 nF.
It features dual-supply and single-supply operability, with fully characterized electrical specifications at both 5 V and 16 V. The amplifier maintains −64 dBc THD at 5 MHz (2 VPP), 0.12% differential gain, and 0.12° differential phase into 150 Ω-meeting stringent analog video fidelity requirements for TFT-LCD timing and bias control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 16 V - supports both portable 5 V and panel-integrated 12–16 V systems without level-shifting. |
| −3 dB Bandwidth (AV = +1) | 190 MHz at 16 V - enables wideband video signal amplification and fast transient response in VCOM settling. |
| Slew Rate | 170 V/µs - sustains full-power bandwidth of ~28 MHz at 5 V supply, critical for sharp-edged VCOM transitions. |
| Output Current (Linear) | ±100 mA - drives heavy capacitive loads (e.g., 200 nF TFT VCOM bus) without clipping or thermal shutdown. |
| Input Common-Mode Range | −0.3 V to 15.1 V at 16 V supply - operates as true single-supply op-amp with ground-referenced inputs. |
| Output Swing | Within 100 mV of either rail - maximizes dynamic range in low-voltage applications (e.g., battery-powered displays). |
| Differential Gain / Phase | 0.12% / 0.12° at 5 MHz, RL = 150 Ω - meets broadcast-grade video fidelity for LCD panel bias accuracy. |
Pinout & Package
LMH6640MFX/NOPB is housed in a 5-pin SOT-23 package (NSC drawing MF05A), with thermal resistance θJA = 265 °C/W. This compact surface-mount outline supports high-density PCB layouts in space-constrained display modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier Output | High-current rail-to-rail output capable of sourcing/sinking ±100 mA into capacitive loads. |
| 2 (−IN) | Inverting Input | Differential input node; accepts signals within −0.3 V to 15.1 V at 16 V supply. |
| 3 (+IN) | Non-Inverting Input | High-impedance input (RIN = 32 MΩ) with no phase reversal on CMVR exceedance. |
| 4 (V−) | Negative Supply | Ground reference in single-supply mode; supports split-supply operation down to −18 V total. |
| 5 (V+) | Positive Supply | Accepts up to 16 V; supply current is 4 mA typical at 16 V, enabling low-power display subsystems. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Within 100 mV of V+ and V− - preserves >98% of available voltage headroom in 5 V or 16 V systems. |
| No output phase reversal | Guaranteed even when input exceeds CMVR - eliminates latch-up risk in VCOM bias circuits during power sequencing. |
| Stable unity-gain operation | Verified with >200 nF capacitive load - enables direct connection to TFT panel VCOM bus without external isolation resistors. |
| Low distortion video drive | −64 dBc THD @ 5 MHz, 0.12% DG/0.12° DP - ensures accurate grayscale reproduction and color fidelity across LCD rows/columns. |
| Wide supply range | 4.5 V to 16 V operation - simplifies BOM by supporting both portable (5 V) and industrial/panel-integrated (12–16 V) designs. |
Applications
| TFT Panel VCOM Buffer | ADC Driver / Buffer |
|---|---|
|
Use Scenario: Driving the common voltage (VCOM) node of an active-matrix TFT-LCD panel, which presents a large, distributed RC load (>100 nF, ~50 Ω). IC Role / Device Role / Timing Role: High-current, unity-gain buffer that stabilizes VCOM against column driver coupling and row-line switching transients. Use Value: Enables sub-5 µs settling time and <0.1% gain error across full temperature range (−40°C to +85°C), ensuring consistent pixel brightness. |
Use Scenario: Conditioning analog signals prior to sampling by high-speed ADCs in portable instrumentation or video digitizers. IC Role / Device Role / Timing Role: Low-noise, fast-settling driver that maintains signal integrity with minimal group delay variation. Use Value: 35 ns ±0.1% settling time and 23 nV/√Hz input voltage noise preserve SNR and effective resolution in 10–14-bit systems. |
| Portable Video Signal Amplifier | Current Sense Buffer |
|
Use Scenario: Amplifying composite video (CVBS), Y/C, or RGB signals in handheld media players or digital cameras. IC Role / Device Role / Timing Role: Video line driver delivering broadcast-compliant differential gain/phase into 75 Ω or 150 Ω loads. Use Value: 0.12% differential gain and 0.12° differential phase meet NTSC/PAL fidelity requirements without post-correction circuitry. |
Use Scenario: Isolating and scaling shunt-based current measurements in power management ICs or LED backlight drivers. IC Role / Device Role / Timing Role: Precision, high-slew-rate buffer with rail-to-rail input/output for bidirectional current sensing near ground or supply rails. Use Value: Input CMVR extends to −0.3 V, enabling accurate low-side sensing; output swing to 100 mV of rails preserves measurement resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-output-current, high-speed op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6642MFX/NOPB | Dual-channel version in same SOT-23-8 package; identical per-channel specs but higher total supply current (8 mA). | Used where two matched VCOM buffers or dual-path video conditioning is required on one die. | Select when board space is constrained and dual-channel functionality adds value without compromising thermal performance. |
| THS3201DR | Higher slew rate (4300 V/µs) and bandwidth (1.8 GHz), but limited output current (±120 mA peak, non-linear beyond ±60 mA) and no rail-to-rail output. | Suitable for RF/IF signal paths, not VCOM buffering; requires external level-shifting and output clamping for LCD use. | Choose only for ultra-high-frequency small-signal amplification-not for high-current, low-distortion video bias applications like LMH6640MFX/NOPB. |
Compared with LMH6640MFX/NOPB, LMH6642MFX/NOPB offers channel integration at the cost of higher quiescent power, while THS3201DR trades video-optimized linearity and rail-to-rail capability for raw speed-making neither a drop-in replacement, but each viable for distinct system-level trade-offs.
Availability
LMH6640MFX/NOPB is available at Aetrix Electronics and suitable for TFT-LCD VCOM buffering, portable video signal conditioning, and high-speed ADC driver applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LMH6640MFX/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 acquired National Semiconductor in 2011 and maintains its high-performance analog portfolio, including precision, high-speed, and interface products for industrial, automotive, and consumer markets.
The LMH6640MFX/NOPB belongs to National's LMH™ high-speed op-amp family, designed specifically for demanding video, imaging, and display applications where output current, bandwidth, and DC accuracy must coexist in compact packages.
FAQ
What is the maximum capacitive load the LMH6640MFX/NOPB can drive stably in unity-gain configuration?
The LMH6640MFX/NOPB has been validated to drive ≥200 nF capacitive loads stably in unity-gain VCOM buffer applications, as confirmed in TI's application note (SNLA153). Its internal compensation and high output current (±100 mA) prevent peaking or oscillation, eliminating need for series isolation resistors in most TFT panel implementations. This capability is explicitly tested and guaranteed across −40°C to +85°C.
Does the LMH6640MFX/NOPB support true single-supply operation with inputs referenced to ground?
Yes, the LMH6640MFX/NOPB supports true single-supply operation: its input common-mode voltage range extends to −0.3 V below V− (i.e., −0.3 V with V− = 0 V) and to within 0.9 V of V+, allowing ground-referenced inputs at 5 V or 16 V supply. This is confirmed in both 5 V and 16 V electrical characteristics tables, and no external level-shifting is required for DC-coupled sensor or video signal interfaces.
What is the guaranteed full-power bandwidth of the LMH6640MFX/NOPB at 5 V supply?
At 5 V single supply, the LMH6640MFX/NOPB delivers a guaranteed full-power bandwidth of 28 MHz (−1 dB, 2 VPP output), derived directly from its 170 V/µs slew rate. This is explicitly stated in the General Description and verified in the 5 V Electrical Characteristics table under FPBW parameter, making it suitable for fast-settling video and data acquisition applications.
How does the LMH6640MFX/NOPB perform in differential gain and phase for NTSC video signals?
The LMH6640MFX/NOPB achieves 0.12% differential gain and 0.12° differential phase at 5 MHz into a 150 Ω load under NTSC conditions (AV = +2), as measured and guaranteed in the 16 V Electrical Characteristics table. These values meet broadcast-grade video fidelity requirements and are critical for minimizing color shift and luminance error in TFT-LCD panels driven by analog video sources.
Is the LMH6640MFX/NOPB pin-compatible with other SOT-23-5 op-amps such as the LMV721?
No, the LMH6640MFX/NOPB is not pin-compatible with general-purpose SOT-23-5 op-amps like the LMV721. Its pin 1 is OUT, pin 2 is −IN, pin 3 is +IN, pin 4 is V−, and pin 5 is V+ - a standard SOT-23-5 op-amp configuration - but functional compatibility requires verification of bandwidth, output current, and stability under load. LMV721 lacks rail-to-rail output, cannot source/sink ±100 mA, and is not characterized for video distortion metrics; thus, direct substitution is not recommended.
LMH6640MFX/NOPB 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/NOPB FAQ
1.How can I place an order for LMH6640MFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6640MFX/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 LMH6640MFX/NOPB reliable?
The price and inventory of LMH6640MFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6640MFX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6640MFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6640MFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6640MFX/NOPB?
LMH6640MFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6640MFX/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 LMH6640MFX/NOPB?
For technical support, including LMH6640MFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6640MFX/NOPB requirements.
6.How does Aetrix verify that LMH6640MFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6640MFX/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 LMH6640MFX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6640MFX/NOPB?
All LMH6640MFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6640MFX/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 LMH6640MFX/NOPB part is unused and in its original packaging.
Return procedure for LMH6640MFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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