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Texas Instruments LMH6647MA/NOPB
- Part No.:
- LMH6647MA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6647MA/NOPB.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:737
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Product details
Overview
LMH6647MA/NOPB from Texas Instruments is a single-channel, rail-to-rail input/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 instrumentation for multiplexed signal conditioning.
For engineers reviewing the LMH6647MA/NOPB datasheet, LMH6647MA/NOPB pinout, LMH6647MA/NOPB application, or LMH6647MA/NOPB equivalent, key selection criteria include shutdown threshold voltage (2.30 V typ at 2.7 V supply), turn-on/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 LMH6647MA/NOPB employs a proprietary VIP10 dielectrically isolated bipolar process enabling high ft (~8 GHz) under low-voltage operation. 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 drift 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 bandwidth (55 MHz) and slew rate (22 V/μs) across 2.7–12 V supply range - critical for battery-powered systems requiring stable gain and phase response over varying cell voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 55 MHz at AV = +1 - supports video, ADC driver, and active filter designs up to ~35 MHz usable signal bandwidth. |
| Slew Rate | 22 V/μs - enables clean 10 VPP output at 350 kHz full-power bandwidth without slewing distortion. |
| Supply Current | 650 μA per channel (normal), ≤50 μA (shutdown) - extends battery life in intermittent-sampling applications. |
| Input Voltage Noise | 17 nV/√Hz at 100 kHz - suitable for precision sensor interfaces where low-frequency noise dominates. |
| Output Swing | Within 20 mV of V+ and V− rails at RL = 1 kΩ - maximizes dynamic range in 3.3 V or lower single-supply systems. |
| Shutdown Threshold | 2.30 V (typ) at VS = 2.7 V - allows direct interface with 1.8 V or 2.5 V logic without level-shifting. |
| Turn-off Time | 560 ns (typ) - ensures fast power-gating in time-multiplexed channel architectures. |
Pinout & Package
SOT-23-6 package (2.92 mm × 1.60 mm body), thermally enhanced for low-power high-speed operation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: N/C | No Connection | Unbonded pad; must be left floating or grounded per layout guidelines to avoid parasitic coupling. |
| 2: −IN | Inverting Input | Differential input node; high-impedance (3 MΩ) with 2 pF capacitance - requires matched trace routing for optimal CMRR. |
| 3: +IN | Non-inverting Input | Complementary differential input; supports rail-to-rail common-mode range (−0.3 V to V+ + 0.3 V). |
| 4: V− | Negative Supply | Ground reference in single-supply mode; connects to −5 V in split-supply configurations. |
| 5: OUTPUT | Amplifier Output | Capable of ±20 mA linear drive into 1 kΩ load; output impedance <1 Ω below 1 MHz for stable capacitive loading. |
| 6: SD | Shutdown Control | Active-high digital input; pulls supply current to ≤50 μA when driven ≥2.30 V (2.7 V supply). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input common-mode extends 0.3 V beyond rails; output swings within 20 mV of V+ and V− - preserves full-scale resolution in low-voltage data acquisition. |
| Micro-power shutdown | Reduces quiescent current to ≤50 μA while retaining fast wake-up (250 ns turn-on) - ideal for duty-cycled sensor front-ends. |
| Supply-independent performance | 55 MHz bandwidth and 22 V/μs slew rate vary <10% from 2.7 V to 12 V - eliminates recalibration across battery discharge cycles. |
| Low input bias current | ±0.68 μA max at 25°C - minimizes DC error in high-impedance transducer interfaces (e.g., piezoelectric sensors). |
| Robust ESD rating | 2000 V HBM - withstands handling in standard assembly environments without additional protection circuitry. |
Applications
| Active Filters | Multiplexed Signal Conditioning |
|---|---|
Use Scenario: 4th-order Butterworth low-pass filter in portable ECG monitor with 1 kHz cutoff. IC Role / Device Role / Timing Role: Voltage feedback amplifier implementing unity-gain stable filter topology with precise pole placement. Use Value: 55 MHz bandwidth ensures >60 dB stopband attenuation at 10 kHz while maintaining phase linearity across passband. | Use Scenario: Channel-selectable buffer in 8-channel industrial temperature scanner using analog multiplexer. IC Role / Device Role / Timing Role: Shutdown-enabled signal conditioner activated only during sampling window of selected channel. Use Value: 560 ns turn-off time prevents crosstalk between adjacent channels; 250 ns turn-on enables sub-μs settling for 1 MSPS throughput. |
| Current Sense Buffer | High-Speed Portable Instrumentation |
Use Scenario: Bidirectional shunt-based current measurement in USB-C PD controller with ±20 A range. IC Role / Device Role / Timing Role: Precision gain-of-10 buffer isolating low-impedance shunt from ADC input while rejecting common-mode noise. Use Value: 77 dB CMRR at DC and 46 dB at 100 kHz suppresses switching noise from nearby buck converters. | Use Scenario: Front-end amplifier in handheld oscilloscope probe with 200 MHz analog bandwidth requirement. IC Role / Device Role / Timing Role: First-stage gain block driving 50 Ω coaxial cable to digitizer, requiring low noise and fast overload recovery. Use Value: 17 nV/√Hz input voltage noise contributes <0.5 LSB error in 12-bit 100 MSPS ADC system; 410 ns overload recovery restores accuracy after 10 V step. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed rail-to-rail amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6645MA/NOPB | No shutdown pin; SOT-23-5 package (5-pin, no SD terminal); identical AC specs but lacks power-gating capability. | Used where continuous operation is required and board area permits omission of external enable logic. | Select when shutdown functionality is unnecessary and lowest possible footprint (2.90 mm × 1.60 mm) is critical. |
| OPA355DBVR | Lower bandwidth (200 MHz), higher supply current (8.5 mA), no shutdown; optimized for unity-gain stability with 0.1 pF compensation. | Preferred in RF signal chains requiring wider bandwidth and faster settling (<25 ns), but unsuitable for battery-constrained systems. | Choose for high-frequency (>50 MHz) small-signal amplification where power budget exceeds 5 mA per channel. |
Compared with LMH6645MA/NOPB, LMH6647MA/NOPB adds shutdown control at identical speed/power trade-off; versus OPA355DBVR, it trades 145 MHz bandwidth for 92% lower quiescent current and rail-to-rail input - making it optimal for portable, multiplexed, or battery-operated precision analog front-ends.
Availability
LMH6647MA/NOPB is available at Aetrix Electronics and suitable for active filters, multiplexed signal conditioning, current sense buffering, and high-speed portable instrumentation requiring stable component supply across industrial temperature range (−40°C to +85°C).
Supply support for LMH6647MA/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 LMH664x product line was designed for low-voltage, high-speed signal conditioning in portable and battery-powered equipment - emphasizing rail-to-rail operation, micro-power shutdown, and supply-voltage insensitivity without sacrificing bandwidth or linearity.
FAQ
What is the shutdown threshold voltage for LMH6647MA/NOPB at 2.7 V supply?
The LMH6647MA/NOPB shutdown threshold voltage is 2.30 V (typical) when operated at V+ = 2.7 V, with guaranteed turn-off occurring at ≥1.95 V and turn-on at ≤2.30 V. This allows direct interfacing with 1.8 V or 2.5 V GPIO without level-shifting circuitry, and ensures reliable disable behavior across −40°C to +85°C ambient temperatures as specified in the Electrical Characteristics table.
Does LMH6647MA/NOPB support true rail-to-rail input common-mode range?
Yes, LMH6647MA/NOPB supports rail-to-rail input with common-mode voltage range extending 0.3 V beyond either supply rail - i.e., from (V− − 0.3 V) to (V+ + 0.3 V). At 2.7 V single supply (V− = 0 V), this enables input signals from −0.3 V to +3.0 V, verified by test data in the CMVR specification (2.8 V to 3.2 V min/max at temperature extremes) and functional block diagram analysis.
What is the typical output swing capability of LMH6647MA/NOPB into 1 kΩ load?
The LMH6647MA/NOPB delivers typical output swing within 20 mV of both supply rails into a 1 kΩ load referenced to V+/2. For example, at V+ = 2.7 V and V− = 0 V, VO(HIGH) = 2.66 V and VO(LOW) = 40 mV - confirmed in the Electrical Characteristics table under "Output swing high/low" at 2.7 V supply. This rail-to-rail output enables maximum dynamic range in low-voltage data acquisition systems.
Can LMH6647MA/NOPB drive capacitive loads without instability?
LMH6647MA/NOPB is unity-gain stable and can drive up to 100 pF capacitive load with minimal peaking (<1 dB) and 10% overshoot, as shown in Figure 17 (Cap Load Tolerance vs. Closed Loop Gain). For loads >100 pF, TI recommends adding a 10–50 Ω series resistor at the output to isolate capacitance - a technique validated in Layout Example section (Figure 11) and confirmed by measured ZOUT vs. frequency data.
What is the input voltage noise density of LMH6647MA/NOPB at 100 kHz?
The LMH6647MA/NOPB exhibits 17 nV/√Hz input-referred voltage noise density at 100 kHz, as specified in the Electrical Characteristics tables for 2.7 V, 5 V, and ±5 V supplies. This value remains stable across supply voltages and temperature (−40°C to +85°C), and is confirmed by Figure 8 (Noise vs. Frequency) showing flat spectral density from 10 kHz to 1 MHz - critical for wideband sensor signal conditioning.
LMH6647MA/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- VIP10™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 8-SOIC
LMH6647MA/NOPB FAQ
1.How can I place an order for LMH6647MA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6647MA/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 LMH6647MA/NOPB reliable?
The price and inventory of LMH6647MA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6647MA/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6647MA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6647MA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6647MA/NOPB?
LMH6647MA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6647MA/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 LMH6647MA/NOPB?
For technical support, including LMH6647MA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6647MA/NOPB requirements.
6.How does Aetrix verify that LMH6647MA/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6647MA/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 LMH6647MA/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6647MA/NOPB?
All LMH6647MA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6647MA/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 LMH6647MA/NOPB part is unused and in its original packaging.
Return procedure for LMH6647MA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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