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Texas Instruments LMH6647MF-TI
- Part No.:
- LMH6647MF-TI
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
LMH6647MF-TI.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:31,000
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Product details
Overview
LMH6647MF-TI from Texas Instruments is a single-channel, rail-to-rail input and output voltage feedback operational amplifier with shutdown control, designed for low-voltage, high-speed signal conditioning. It delivers 55 MHz −3 dB bandwidth, 22 V/μs slew rate, and ±20 mA linear output current at 2.7 V supply, enabling use in portable current-sense buffers and multiplexed analog front-ends.
For engineers reviewing the LMH6647MF-TI datasheet, LMH6647MF-TI pinout, LMH6647MF-TI application, or LMH6647MF-TI 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 input common-mode range (0.3 V beyond rails), and SOT-23-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LMH6647MF-TI employs a proprietary VIP10 dielectrically isolated bipolar process to sustain high ft (~8 GHz) under low 2.7 V supply and micro-power bias. Its rail-to-rail input stage extends common-mode range beyond both supply rails by 0.3 V, while the class A-B "turn-around" input stage reduces noise and offset drift versus conventional high-speed op-amps.
The output stage uses a common-emitter push-pull topology delivering ±20 mA into loads within 20 mV of either rail at light loads, with consistent bandwidth and slew rate across 2.5–12 V supply range-enabling stable performance in battery-powered and dual-supply systems without recalibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 55 MHz at AV = +1 - supports high-frequency closed-loop gain configurations up to 10 MHz with ≥20 dB gain margin. |
| Slew Rate | 22 V/μs - enables clean 10 VPP square-wave reproduction up to ~3.5 MHz without slewing distortion. |
| Supply Current | 650 μA per channel (normal), ≤50 μA (shutdown) - extends battery life in intermittent-sampling systems. |
| Input Voltage Noise | 17 nV/√Hz at 100 kHz - suitable for precision DC-coupled amplification before ADCs with ≥12-bit ENOB. |
| 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 data acquisition. |
| Shutdown Threshold | 2.30 V (typ) at VS = 2.7 V - allows direct interface with 1.8 V or 2.5 V logic-level enable signals via resistor divider. |
| Input Common-Mode Range | Extends 0.3 V beyond V− and V+ - accepts ground-referenced inputs in single-supply configurations without level-shifting. |
Pinout & Package
SOT-23-6 package (2.92 mm × 1.60 mm body), thermally enhanced for continuous operation at ambient temperatures up to +85°C with RθJA = 235°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Amplified signal source capable of sourcing/sinking ±20 mA within 20 mV of rails. |
| 2 | Inverting Input | Differential input node with 3 MΩ common-mode resistance and 2 pF capacitance - minimizes phase error in unity-gain stable configurations. |
| 3 | Non-inverting Input | High-impedance input accepting signals from 0.3 V below V− to 0.3 V above V+ - eliminates need for external biasing in single-supply sensor interfaces. |
| 4 | V− | Negative supply terminal; supports single-supply (0 V) or split-supply (±2.5 V) operation. |
| 5 | Shutdown | Active-high digital control input; pulls supply current to ≤50 μA when driven ≥2.30 V (2.7 V supply). |
| 6 | V+ | Positive supply terminal; operates from 2.5 V to 12 V - compatible with Li-ion, USB, and industrial 5 V/12 V rails. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input CMVR extends 0.3 V beyond supplies; output swings to within 20 mV of rails - preserves full-scale resolution in low-voltage ADC drivers. |
| Micro-power shutdown | Reduces quiescent current to ≤50 μA while maintaining fast 250 ns wake-up - ideal for duty-cycled sensor nodes. |
| Stable over supply range | Bandwidth, slew rate, and output current vary <10% from 2.5 V to 12 V - eliminates recalibration across power domains. |
| Low input bias current | ±0.68 μA max at 25°C - enables high-impedance transducer buffering (e.g., piezoelectric sensors) without significant DC error. |
| Robust ESD rating | 2000 V HBM - withstands handling in standard assembly environments without additional protection circuitry. |
Applications
| Current Sense Buffer | Multiplexed Analog Front-End |
|---|---|
Use Scenario: Amplifying mV-level shunt voltage in battery management ICs with 3.3 V supply and intermittent measurement cycles. IC Role / Device Role / Timing Role: Precision gain stage with shutdown-controlled power gating between ADC sampling events. Use Value: 650 μA operating current and ≤50 μA shutdown current extend cycle life; rail-to-rail output drives 12-bit SAR ADC input fully. | Use Scenario: Selecting one of multiple sensor outputs (thermocouple, RTD, strain gauge) into a shared signal chain using analog switches. IC Role / Device Role / Timing Role: Channel buffer isolating switch feedthrough and driving anti-alias filter with minimal settling delay. Use Value: 250 ns turn-on time ensures <1 μs channel enable-to-valid-data latency; 55 MHz bandwidth preserves step fidelity after switching. |
| Portable Active Filter | High-Speed Transducer Interface |
Use Scenario: 2nd-order Sallen-Key low-pass filter in handheld medical ultrasound front-end, powered from 3.7 V Li-ion cell. IC Role / Device Role / Timing Role: Unity-gain stable amplifier implementing filter transfer function with minimal phase shift. Use Value: 17 nV/√Hz input voltage noise maintains SNR >70 dB up to 1 MHz; rail-to-rail I/O accommodates full 0–3.3 V filter output swing. | Use Scenario: Conditioning high-impedance piezoelectric vibration sensor output (100 kΩ || 1 nF) in predictive maintenance edge node. IC Role / Device Role / Timing Role: Charge-to-voltage converter with high-Z input and low-noise gain stage before digitization. Use Value: 3 MΩ input resistance and 2 pF capacitance minimize resonance peaking; 22 V/μs slew rate handles 10 kHz burst signals without distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, rail-to-rail op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA355DBVR | Lower 200 MHz GBW but higher 35 V/μs slew rate; no shutdown pin; 1.8–5.5 V supply range. | Lacks integrated shutdown control - requires external enable logic for power cycling. | Select when maximum speed (>10 MHz small-signal) is critical and shutdown is implemented externally. |
| TLV2461CDBVR | 2.2 MHz GBW, 0.6 V/μs slew rate, 1.2 mA supply current; includes shutdown; 2.7–6 V supply. | Insufficient bandwidth for >1 MHz signal paths - limited to DC–100 kHz sensor conditioning. | Select only for ultra-low-power (<100 μA shutdown), low-bandwidth (<200 kHz) applications where speed is secondary. |
Compared with OPA355DBVR and TLV2461CDBVR, the LMH6647MF-TI uniquely balances 55 MHz bandwidth, 650 μA supply current, and integrated shutdown in SOT-23-6 - making it optimal for battery-powered, multiplexed, medium-bandwidth analog signal chains requiring rapid channel enable/disable.
Availability
LMH6647MF-TI is available at Aetrix Electronics and suitable for current sense buffers, multiplexed analog front-ends, portable active filters, and high-speed transducer interfaces requiring stable component supply across automotive, industrial, and medical OEM programs.
Supply support for LMH6647MF-TI 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 op-amps, data converters, and power management ICs.
The LMH6647MF-TI belongs to TI's LMH664x family of rail-to-rail I/O amplifiers, engineered for low-voltage, high-speed signal conditioning in portable and power-sensitive applications where bandwidth, precision, and micro-power shutdown are jointly required.
FAQ
What is the minimum supply voltage for reliable operation of the LMH6647MF-TI?
The LMH6647MF-TI is specified for reliable operation down to 2.5 V supply voltage (V+ − V−), with guaranteed −3 dB bandwidth of 40 MHz and slew rate of 15 V/μs at 2.7 V. Operation below 2.5 V is not characterized and may result in degraded bandwidth, increased offset, or failure to meet shutdown threshold specifications. Always refer to Section 7.3 (Recommended Operating Conditions) of the SNOS970D datasheet for validated limits.
Does the LMH6647MF-TI require external compensation for unity-gain stability?
No, the LMH6647MF-TI is internally compensated for unity-gain stability across its full operating temperature and supply range. It maintains phase margin >60° at AV = +1 with capacitive loads up to 100 pF, as verified in Figure 17 (Cap Load Tolerance) of the SNOS970D datasheet. No external compensation components are needed for standard non-inverting or inverting unity-gain configurations.
How does the shutdown feature of the LMH6647MF-TI behave during power-up?
During power-up, the LMH6647MF-TI enters normal operation only after the shutdown pin voltage exceeds the threshold (2.30 V typ at 2.7 V supply). If SD is left floating or pulled low, the device remains in shutdown with ≤50 μA supply current. TI recommends tying SD to V+ through a 100 kΩ resistor or controlling it actively to prevent undefined startup states. Output remains high-impedance until SD is asserted.
Can the LMH6647MF-TI drive a 50 Ω load directly?
The LMH6647MF-TI is not optimized for direct 50 Ω driving: its specified ±20 mA linear output current corresponds to loads ≥250 Ω (at 5 V swing). Driving 50 Ω causes clipping and thermal stress beyond safe operating area limits. For 50 Ω interfaces, use a dedicated line driver (e.g., THS3201) or add series termination (e.g., 45 Ω in series with 50 Ω load) to limit current while preserving signal integrity.
What is the typical input offset voltage drift over temperature for the LMH6647MF-TI?
The LMH6647MF-TI has a typical input offset voltage drift of ±5 μV/°C across −40°C to +85°C, as specified in the "TC VOS" parameter (Section 7.5, Electrical Characteristics at 2.7 V). This low drift ensures <0.5 mV total offset change over full industrial temperature range - critical for precision DC-coupled amplification in battery-operated instrumentation.
LMH6647MF-TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- 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:
- 55 MHz
- -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
LMH6647MF-TI FAQ
1.How can I place an order for LMH6647MF-TI through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6647MF-TI 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 LMH6647MF-TI reliable?
The price and inventory of LMH6647MF-TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6647MF-TI is usually 5 days.
3.What payment methods are accepted for LMH6647MF-TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6647MF-TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6647MF-TI?
LMH6647MF-TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6647MF-TI 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 LMH6647MF-TI?
For technical support, including LMH6647MF-TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6647MF-TI requirements.
6.How does Aetrix verify that LMH6647MF-TI is sourced from the original manufacturer or authorized distributors?
All LMH6647MF-TI 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 LMH6647MF-TI meets industry standards.
7.What is the process for return or replacement of LMH6647MF-TI?
All LMH6647MF-TI units undergo pre-shipment inspection (PSI). If there is an issue with LMH6647MF-TI, 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 LMH6647MF-TI part is unused and in its original packaging.
Return procedure for LMH6647MF-TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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