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Texas Instruments LMH6647MAX
- Part No.:
- LMH6647MAX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6647MAX.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,616
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Product details
Overview
LMH6647MAX 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. It enables high-speed current sense buffering and multiplexing in portable instrumentation.
For engineers reviewing the LMH6647MAX datasheet, LMH6647MAX pinout, LMH6647MAX application, or LMH6647MAX 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 LMH6647MAX uses a proprietary VIP10 dielectrically isolated bipolar process enabling 55 MHz bandwidth and 22 V/μs slew rate even at 2.7 V supply. Its rail-to-rail input stage extends common-mode range 0.3 V beyond rails, while the class A-B "turn-around" input stage reduces offset drift and noise versus conventional architectures.
Shutdown is controlled via a dedicated SD pin with 2.30 V typical threshold at 2.7 V supply; during shutdown, supply current drops to ≤50 μA while maintaining well-behaved turn-on/off transitions and minimal output fluctuation-critical for power-gated signal paths in battery-powered multiplexers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 55 MHz at AV = +1 - supports video, ADC driver, and fast filter applications up to ~35 MSPS. |
| Slew Rate | 22 V/μs - enables clean 10 VPP step response within 45 ns, critical for pulse amplification. |
| Supply Current | 650 μA per channel (normal), ≤50 μA (shutdown) - enables micro-power operation in intermittent-sampling systems. |
| Output Swing | Within 20 mV of either rail at RL = 1 kΩ - maximizes dynamic range in low-voltage (2.7 V) single-supply systems. |
| Input Voltage Noise | 17 nV/√Hz at 100 kHz - suitable for precision transducer amplification without dominating sensor noise floor. |
| Shutdown Threshold | 2.30 V (typ) at VS = 2.7 V - allows direct interface with 1.8 V/3.3 V logic with pull-up or level-shifting. |
| Turn-off Time | 560 ns (typ) - ensures rapid power gating in time-division multiplexed signal chains. |
Pinout & Package
SOT-23-6 package (2.92 mm × 1.60 mm body size), thermally optimized for low-profile portable designs with exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUTPUT | Amplifier output | Delivers rail-to-rail voltage swing; drives 1 kΩ load to within 20 mV of rails. |
| 2 - IN− | Inverting input | Differential input node; supports common-mode voltage up to 0.3 V beyond V− or V+. |
| 3 - IN+ | Non-inverting input | High-impedance input (3 MΩ RIN); referenced to same common-mode range as IN−. |
| 4 - V− | Negative supply | Accepts ground (single-supply) or negative rail (split-supply); supports −0.8 V absolute min rating. |
| 5 - SD | Shutdown control input | CMOS-compatible digital input; pulls device into <50 μA quiescent state when low. |
| 6 - V+ | Positive supply | Operates from 2.5 V to 12 V; PSRR ≥75 dB ensures stability against supply ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input common-mode extends 0.3 V beyond supplies; output swings to within 20 mV of rails - preserves full signal headroom in 2.7 V systems. |
| Micro-power shutdown | Reduces supply current to ≤50 μA while retaining fast 250 ns turn-on - ideal for duty-cycled sensor interfaces. |
| Low-noise architecture | 17 nV/√Hz input voltage noise at 100 kHz - avoids degrading SNR in front-end amplification of µV-level transducer signals. |
| VIP10 process optimization | Enables 55 MHz bandwidth and 22 V/μs slew rate at only 650 μA - achieves speed/power ratio superior to legacy bipolar op-amps. |
| Supply voltage independence | Bandwidth, slew rate, and output current vary <10% across 2.5–12 V supply range - simplifies design reuse across multiple platforms. |
Applications
| Current Sense Buffer | Multiplexing Signal Path |
|---|---|
Use Scenario: Amplifying mV-level shunt voltage in battery management ICs with 3.3 V supply and intermittent sampling. IC Role / Device Role / Timing Role: High-speed, low-offset buffer placed directly after current-sense resistor; operates only during measurement windows. Use Value: 20 mV rail-to-rail output swing preserves 99% of 3.3 V ADC full-scale range; 560 ns turn-off minimizes leakage between channels. | Use Scenario: Selecting one of eight analog sensor outputs using analog switches, with shared amplifier stage. IC Role / Device Role / Timing Role: Shared gain stage enabled only when its assigned channel is selected; SD pin synchronized to switch control. Use Value: 250 ns turn-on ensures signal integrity at >1 MSPS multiplexing rates; shutdown current <50 μA prevents cumulative idle power in 8-channel system. |
| Portable Instrumentation Front-End | Active Filter Stage |
Use Scenario: Battery-powered handheld oscilloscope input stage requiring DC-coupled, wide-dynamic-range amplification. IC Role / Device Role / Timing Role: First gain stage after probe attenuation; configured for AV = +2 with rail-to-rail input to accept ±2 V input range on 5 V supply. Use Value: 55 MHz bandwidth supports >20 MHz analog bandwidth; 0.3 V beyond-rail input allows accurate zero-crossing detection near supply limits. | Use Scenario: Second-order Sallen-Key low-pass filter in medical ECG signal conditioning with cutoff at 150 Hz. IC Role / Device Role / Timing Role: Unity-gain stable amplifier implementing filter transfer function; drives 10 kΩ filter impedance with minimal phase shift. Use Value: 17 nV/√Hz input noise contributes <0.5 µV RMS integrated noise in 150 Hz BW; 22 V/μs slew rate prevents distortion on 5 VPP pacing pulses. |
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 |
|---|---|---|---|
| LMH6645MAX | No shutdown pin; identical bandwidth, slew rate, and noise; same SOT-23-5 footprint (pin 5 unused vs. LMH6647MAX pin 5 SD). | Used where continuous operation is required and board area permits separate enable logic or no power gating. | Select LMH6645MAX if shutdown functionality is unnecessary and PCB layout rework for 5-pin vs. 6-pin is undesirable. |
| OPA355DBVR | Lower bandwidth (200 MHz), higher supply current (4.5 mA), no shutdown; rail-to-rail I/O, 11 nV/√Hz noise. | Preferred in high-frequency (>50 MHz) signal chains where speed outweighs power budget, e.g., RF IF amplification. | Choose OPA355DBVR only when >100 MHz small-signal bandwidth is mandatory and 7× higher quiescent current is acceptable. |
Compared with LMH6645MAX, LMH6647MAX adds shutdown control at minor cost in pin count and layout complexity; compared with OPA355DBVR, it trades bandwidth and noise for 7× lower supply current and integrated power gating-making it optimal for battery-constrained, medium-bandwidth sensing.
Availability
LMH6647MAX is available at Aetrix Electronics and suitable for current sense buffering, analog multiplexing, portable instrumentation front-ends, and active filter stages requiring stable component supply across industrial and medical OEM programs.
Supply support for LMH6647MAX 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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.
The LMH664x product line targets portable and battery-powered systems needing high-speed amplification with ultra-low quiescent power and rail-to-rail performance across wide supply ranges.
FAQ
What is the shutdown threshold voltage for LMH6647MAX at 2.7 V supply?
The LMH6647MAX shutdown threshold voltage is 2.30 V (typical) when operated at V+ = 2.7 V, with guaranteed minimum of 1.95 V and maximum of 2.30 V. This allows reliable interfacing with 1.8 V logic families using a simple pull-up resistor, and ensures robust disable behavior across temperature (−40°C to +85°C). The shutdown pin draws ≤20 μA input current, minimizing loading on control sources.
Does LMH6647MAX support true rail-to-rail input and output operation?
Yes, LMH6647MAX supports true rail-to-rail input and output. Its input common-mode voltage range extends 0.3 V beyond both supply rails (e.g., −0.3 V to 3.0 V on 2.7 V supply), and its output swings to within 20 mV of either rail under 1 kΩ load. This capability is verified across the full −40°C to +85°C temperature range and enables full utilization of supply voltage in low-voltage, single-supply applications such as portable data loggers.
What is the typical small-signal settling time of LMH6647MAX for a 1 V step?
The LMH6647MAX achieves ±0.1% settling in 250 ns for a 1 V step input under unity-gain configuration with 1 kΩ load and 2.7 V supply. This value is measured at 25°C and reflects the combined effect of 55 MHz bandwidth and 22 V/μs slew rate. Settling time remains stable across supply voltages from 2.5 V to 12 V, making it predictable in multi-rail systems.
Can LMH6647MAX drive a 50 Ω load directly?
No, LMH6647MAX is not designed for direct 50 Ω driving. Its specified linear output current is ±20 mA into loads where output voltage remains ≥0.5 V from either rail; driving 50 Ω would require >100 mA for 5 VPP swing, exceeding safe operating limits. For 50 Ω interfaces, use an external buffer stage or select a purpose-built line driver such as THS3201. LMH6647MAX is optimized for high-impedance loads (≥1 kΩ) in precision analog signal paths.
How does LMH6647MAX compare to LMH6645MAX in pin compatibility and function?
LMH6647MAX (SOT-23-6) and LMH6645MAX (SOT-23-5) share identical amplifier core specifications but differ in shutdown capability and pinout. LMH6647MAX adds SD (pin 5) for power control; LMH6645MAX has no shutdown pin and uses pin 5 as NC. They are not pin-compatible: LMH6647MAX requires six pads, while LMH6645MAX uses five. Functionally, LMH6647MAX replaces LMH6645MAX only when shutdown is needed-and requires PCB layout revision.
LMH6647MAX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- VIP10™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
LMH6647MAX FAQ
1.How can I place an order for LMH6647MAX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6647MAX 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 LMH6647MAX reliable?
The price and inventory of LMH6647MAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6647MAX is usually 5 days.
3.What payment methods are accepted for LMH6647MAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6647MAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6647MAX?
LMH6647MAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6647MAX 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 LMH6647MAX?
For technical support, including LMH6647MAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6647MAX requirements.
6.How does Aetrix verify that LMH6647MAX is sourced from the original manufacturer or authorized distributors?
All LMH6647MAX 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 LMH6647MAX meets industry standards.
7.What is the process for return or replacement of LMH6647MAX?
All LMH6647MAX units undergo pre-shipment inspection (PSI). If there is an issue with LMH6647MAX, 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 LMH6647MAX part is unused and in its original packaging.
Return procedure for LMH6647MAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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