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Texas Instruments LMH6647MFX/NOPB
- Part No.:
- LMH6647MFX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
LMH6647MFX/NOPB.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,701
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Product details
Overview
LMH6647MFX/NOPB from Texas Instruments is a single-channel, rail-to-rail input and output voltage feedback amplifier with shutdown control, operating from 2.5 V to 12 V supply, delivering 55 MHz −3 dB bandwidth, 22 V/μs slew rate, and ±20 mA linear output current at 650 μA supply current per channel - used in high-speed portable devices and multiplexing applications requiring low-power signal conditioning.
For engineers reviewing the LMH6647MFX/NOPB datasheet, LMH6647MFX/NOPB pinout, LMH6647MFX/NOPB application, or LMH6647MFX/NOPB equivalent, key selection criteria include shutdown threshold voltage (2.30 V typ at 2.7 V supply), turn-on/turn-off timing (250 ns / 560 ns), rail-to-rail output swing (20 mV from rails), and SOT-23-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LMH6647MFX/NOPB employs a proprietary VIP10 dielectrically isolated bipolar process enabling high ft (~8 GHz) under low-voltage (2.7 V) and low-current bias. Its rail-to-rail input stage extends common-mode range 0.3 V beyond either supply rail, while the class A-B "turn-around" input stage reduces noise and offset versus conventional high-speed amplifiers.
The output stage uses a common-emitter push-pull configuration capable of sourcing/sinking ±20 mA within 0.5 V of supply rails, maintaining consistent 55 MHz bandwidth and 22 V/μs slew rate across 2.5–12 V supply range - critical for stable gain and phase response in active filters and transducer interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 55 MHz at AV = +1 - supports video, ADC driver, and wideband sensor signal paths up to ~30 MHz usable small-signal bandwidth. |
| Slew Rate | 22 V/μs - enables clean 10 VPP output at ≥1 MHz without distortion in fast-settling applications. |
| Supply Current | 650 μA per channel (typ at 2.7 V) - enables battery-powered operation with <1 mW power budget at 2.7 V. |
| Output Swing | Within 20 mV of either rail (RL = 1 kΩ) - maximizes dynamic range in low-voltage (e.g., 3.3 V or 2.7 V) systems. |
| Input Voltage Noise | 17 nV/√Hz at 100 kHz - suitable for precision transducer amplification where signal integrity dominates over ultra-low noise. |
| Shutdown Threshold | 2.30 V (typ at 2.7 V supply) - allows direct interfacing with 1.8 V or 2.5 V logic for controlled power gating. |
| Turn-off Time | 560 ns (typ at 2.7 V) - ensures minimal transient disturbance during multiplexed channel switching. |
Pinout & Package
SOT-23-6 package (2.92 mm × 1.60 mm body size) with exposed pad for thermal performance; 6-pin layout optimized for minimal parasitic capacitance in high-frequency routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Amplified signal output; rail-to-rail swing supports full-scale analog interface to SAR ADCs or low-voltage logic. |
| 2 | Inverting Input | Differential input node; high-impedance (3 MΩ) with 2 pF capacitance - requires matched trace lengths in high-frequency inverting configurations. |
| 3 | Non-inverting Input | Reference input node; same impedance as IN−; common-mode range extends 0.3 V beyond rails for single-supply sensor biasing. |
| 4 | Negative Supply (V−) | Ground or negative rail connection; supports true single-supply (0 V) or split-supply (±2.5 V) operation. |
| 5 | Shutdown (SD) | CMOS-compatible digital control input; pulls supply current to ≤50 μA when driven <1.95 V (2.7 V supply). |
| 6 | Positive Supply (V+) | Primary power input; operates from 2.5 V to 12 V - no external regulation needed for 3.3 V or 5 V systems. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of supply voltage headroom in 2.7 V–3.3 V systems, eliminating level-shifting components. |
| Shutdown mode (≤50 μA) | Reduces system standby power by >92% vs active mode - essential for duty-cycled sensor front-ends and portable instrumentation. |
| 55 MHz bandwidth at 650 μA | Delivers video-rate and medium-speed data acquisition performance with micro-power efficiency - unmatched in its class. |
| 22 V/μs slew rate | Supports 10 VPP signals at 1 MHz with <1% distortion - sufficient for driving 10-bit ADCs and active filter stages. |
| Input common-mode range beyond rails | Accepts inputs down to −0.3 V (with 0 V V−) - simplifies single-supply biasing of resistive sensors and bridge transducers. |
Applications
| Active Filters | High-Speed Portable Devices |
|---|---|
Use Scenario: 4th-order Butterworth anti-aliasing filter preceding a 1 MSPS SAR ADC in a handheld multimeter. IC Role / Device Role / Timing Role: Voltage feedback amplifier configured in multiple-feedback topology to achieve precise cutoff and group delay. Use Value: 55 MHz bandwidth ensures filter stability and passband flatness up to 100 kHz; rail-to-rail I/O eliminates DC biasing components. |
Use Scenario: Signal conditioning for a battery-powered pulse oximeter with LED driver and photodiode TIA. IC Role / Device Role / Timing Role: Low-noise buffer and gain stage between transimpedance amplifier and ADC input. Use Value: 17 nV/√Hz input noise preserves weak optical signal SNR; 650 μA supply current extends battery life >20 hours. |
| Multiplexing Applications | Current Sense Buffer |
Use Scenario: Channel-selectable gain stage in an 8-channel industrial data logger with shared ADC. IC Role / Device Role / Timing Role: Shutdown-controlled amplifier enabling rapid channel switching without cross-talk. Use Value: 250 ns turn-on / 560 ns turn-off minimizes dead time; 47 dB crosstalk rejection prevents inter-channel interference. |
Use Scenario: Bidirectional current sensing in a 12 V automotive body control module using shunt resistor. IC Role / Device Role / Timing Role: High-side or low-side differential amplifier with gain of +10 to resolve 10 mV sense voltage. Use Value: Input common-mode range extending 0.3 V beyond rails accommodates shunt placement on either side of load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-power operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6645MFX/NOPB | No shutdown pin; identical bandwidth, slew rate, and supply current - SOT-23-5 package lacks SD functionality. | Fixed-operation systems where power gating is unnecessary; saves one PCB trace and one control GPIO. | Select when shutdown capability is not required and board area permits SOT-23-5 footprint. |
| OPA355DBVR | Lower bandwidth (200 MHz), higher supply current (5.3 mA), no rail-to-rail input - CMOS input stage, 2.5 V min supply. | Higher-speed, higher-power applications needing lower input bias current (0.2 pA) and wider supply range. | Select only if >100 MHz bandwidth is mandatory and system power budget allows 8× higher quiescent current. |
Compared with LMH6645MFX/NOPB, LMH6647MFX/NOPB adds shutdown control at identical speed/power trade-off; versus OPA355DBVR, it delivers comparable bandwidth at <13% of the supply current but sacrifices CMOS-level input bias current and maximum frequency.
Availability
LMH6647MFX/NOPB is available at Aetrix Electronics and suitable for high-speed portable devices, active filters, multiplexing applications, and current sense buffers requiring stable component supply across industrial temperature range (−40°C to +85°C) and long-term production continuity.
Supply support for LMH6647MFX/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 company specializing in analog and embedded processing technologies, with leadership in high-performance amplifiers, data converters, and power management ICs.
The LMH6647MFX/NOPB belongs to TI's LMH664x family of rail-to-rail I/O amplifiers designed for low-voltage, high-speed signal conditioning in portable instrumentation, medical devices, and industrial sensing - emphasizing micro-power operation without sacrificing bandwidth or drive strength.
FAQ
What is the shutdown threshold voltage for LMH6647MFX/NOPB at 2.7 V supply?
The LMH6647MFX/NOPB shutdown threshold voltage is 1.95 V (min) to 2.30 V (typ) when operated at 2.7 V supply, ensuring reliable disablement with standard 1.8 V logic outputs. This threshold remains stable across temperature (−40°C to +85°C), and the shutdown pin draws ≤−20 μA input current, minimizing control-line loading. The LMH6647MFX/NOPB enters low-current mode (<50 μA total) once the SD pin falls below this range.
Does LMH6647MFX/NOPB support true single-supply operation with input signals below ground?
Yes, LMH6647MFX/NOPB supports true single-supply operation with input common-mode voltage extending 0.3 V below the negative rail (e.g., −0.3 V with V− = 0 V). This enables direct interfacing with grounded sensors or bridge circuits without external level-shifting. The LMH6647MFX/NOPB maintains rail-to-rail output swing and specified AC performance across this extended input range, verified down to −0.5 V in characterization.
What is the typical output swing of LMH6647MFX/NOPB when driving a 1 kΩ load at 2.7 V supply?
At 2.7 V supply and RL = 1 kΩ, the LMH6647MFX/NOPB delivers output swing within 20 mV of both rails - i.e., 40 mV total headroom - enabling 2.66 VPP usable amplitude. This rail-to-rail capability is maintained across temperature (−40°C to +85°C) and is confirmed in Electrical Characteristics tables for both high-side (2.66 V) and low-side (40 mV) limits. The LMH6647MFX/NOPB sustains this performance with ≤1% THD at 100 kHz.
Can LMH6647MFX/NOPB drive capacitive loads without instability?
The LMH6647MFX/NOPB is unity-gain stable and tolerates ≥100 pF capacitive loads with minimal peaking (<1 dB) when properly laid out (short traces, local bypassing). Figure 17 in the datasheet shows settling time degradation remains within ±1% spec up to 1 nF closed-loop load. For >100 pF, a 10 Ω series resistor at the output is recommended to isolate capacitance - a design practice validated for the LMH6647MFX/NOPB in reference layouts.
How does LMH6647MFX/NOPB compare to LMH6645MFX/NOPB in pin compatibility and function?
The LMH6647MFX/NOPB (SOT-23-6) and LMH6645MFX/NOPB (SOT-23-5) share identical amplifier core specifications (55 MHz BW, 22 V/μs SR, 650 μA IS), but LMH6647MFX/NOPB adds a dedicated shutdown (SD) pin at Pin 5 - making them not pin-compatible. The LMH6647MFX/NOPB requires re-routing for SD control and occupies slightly larger PCB area due to the 6th pin. Functionally, LMH6647MFX/NOPB enables power-gated operation; LMH6645MFX/NOPB is always active.
LMH6647MFX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- VIP10™
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 22V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 55 MHz
- Current - Input Bias:
- 650 nA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 725µA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
LMH6647MFX/NOPB FAQ
1.How can I place an order for LMH6647MFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6647MFX/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 LMH6647MFX/NOPB reliable?
The price and inventory of LMH6647MFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6647MFX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6647MFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6647MFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6647MFX/NOPB?
LMH6647MFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6647MFX/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 LMH6647MFX/NOPB?
For technical support, including LMH6647MFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6647MFX/NOPB requirements.
6.How does Aetrix verify that LMH6647MFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6647MFX/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 LMH6647MFX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6647MFX/NOPB?
All LMH6647MFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6647MFX/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 LMH6647MFX/NOPB part is unused and in its original packaging.
Return procedure for LMH6647MFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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