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Texas Instruments LMH6647MAX/NOPB
- Part No.:
- LMH6647MAX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6647MAX/NOPB.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,827
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Product details
Overview
LMH6647MAX/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. It delivers 55 MHz −3 dB bandwidth, 22 V/μs slew rate, and ±20 mA linear output current while consuming only 650 μA per channel in active mode and <50 μA in shutdown - enabling high-speed signal conditioning in battery-powered current sense and multiplexing applications.
For engineers reviewing the LMH6647MAX/NOPB datasheet, LMH6647MAX/NOPB pinout, LMH6647MAX/NOPB application, or LMH6647MAX/NOPB equivalent, key selection considerations include its SOT-23-6 package, shutdown threshold (2.30 V at 2.7 V supply), turn-on/off timing (250 ns / 560 ns), rail-to-rail swing (20 mV from rails), and verified performance across −40°C to +85°C.
Technical Context
The LMH6647MAX/NOPB uses a proprietary VIP10 dielectrically isolated bipolar process, enabling 8 GHz ft transistors that sustain high speed under low-voltage (2.7 V) bias. Its input stage extends common-mode range 0.3 V beyond rails, and its Class A-B "turn-around" input stage reduces noise and offset drift versus conventional architectures.
The output employs a common-emitter push-pull stage delivering ±20 mA into loads while maintaining rail-to-rail swing (20 mV from V+ or V−) at light loads. Critical parameters - including bandwidth, slew rate, and output current - remain stable across 2.5 V–12 V supply range due to supply-independent biasing and process-enhanced gain staging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 55 MHz at AV = +1 - supports high-frequency closed-loop filtering and video signal paths up to ~35 MHz usable baseband. |
| Slew Rate | 22 V/μs - enables full-scale 2 VPP step response in ≤91 ns with minimal distortion in fast-settling applications. |
| Supply Current | 650 μA/channel active, ≤50 μA in shutdown - allows micro-power operation in duty-cycled sensor interfaces. |
| Output Swing | Within 20 mV of either rail (at RL = 1 kΩ) - maximizes dynamic range in low-voltage (e.g., 2.7 V or 3.3 V) systems. |
| Input Voltage Noise | 17 nV/√Hz at 100 kHz - suitable for precision DC-coupled amplification where noise floor directly impacts SNR. |
| Shutdown Threshold | 2.30 V (min) at VS = 2.7 V - ensures reliable disable below nominal logic-high level, compatible with 1.8 V/3.3 V GPIO control. |
| Turn-off Time | 560 ns (typ) - enables rapid power gating in time-multiplexed analog front-ends without output glitches. |
Pinout & Package
SOT-23-6 package (2.92 mm × 1.60 mm body), thermally enhanced for portable designs; pin 1 = N/C, pin 2 = −IN, pin 3 = +IN, pin 4 = V−, pin 5 = SD, pin 6 = OUTPUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connection | Unbonded pad; must be left floating or grounded per layout guidelines - no electrical function. |
| 2 | Inverting Input | Differential input node; accepts signals up to 0.3 V beyond V− or V+, enabling true rail-to-rail common-mode operation. |
| 3 | Non-inverting Input | High-impedance input (3 MΩ RIN, 2 pF CIN); matched to pin 2 for balanced AC-coupled configurations. |
| 4 | Negative Supply | Reference for internal biasing; supports single-supply (0 V) or split-supply (e.g., −5 V) operation. |
| 5 | Shutdown Control | CMOS-compatible digital input; asserts shutdown when voltage ≤1.95 V (2.7 V supply), drawing <20 μA. |
| 6 | Amplifier Output | Class AB push-pull stage; sources/sinks ±20 mA while maintaining 20 mV rail clearance at RL ≥1 kΩ. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables direct interfacing with ADCs/DACs operating at same supply, eliminating level-shifting circuitry. |
| 650 μA supply current (active) | Reduces quiescent power to 1.755 mW at 2.7 V - critical for always-on sensor nodes and wearable devices. |
| Shutdown mode (<50 μA) | Permits dynamic power management in multi-channel systems; turn-on delay (250 ns) supports sub-microsecond wake-up. |
| 55 MHz bandwidth with 22 V/μs SR | Supports >10-bit ENOB at 10 MHz for high-fidelity signal acquisition without external compensation. |
| Input common-mode range beyond rails | Accepts inputs down to V− − 0.3 V and up to V+ + 0.3 V - simplifies design in single-supply transducer interfaces. |
Applications
| Active Filters | Current Sense Buffer |
|---|---|
Use Scenario: Second-order Sallen-Key low-pass filter in motor control feedback loop, rejecting PWM switching noise above 50 kHz. IC Role / Device Role / Timing Role: Voltage feedback amplifier configured as unity-gain buffer and integrator stage with precise pole placement. Use Value: 55 MHz GBW ensures phase margin >60° at filter cutoff; rail-to-rail swing preserves full 0–3.3 V sensed voltage range. | Use Scenario: Bidirectional shunt current measurement in portable power bank, amplifying mV-level drops across 10 mΩ resistor. IC Role / Device Role / Timing Role: Precision transimpedance buffer with high CMRR (>77 dB) rejecting common-mode battery voltage shifts. Use Value: Input offset drift (±5 μV/°C) minimizes temperature-induced error; 20 mV rail swing accommodates 0–3.6 V supply headroom. |
| Multiplexing Applications | High-Speed Portable Devices |
Use Scenario: Analog multiplexer driver in handheld medical ultrasound front-end, selecting between 8 transducer channels. IC Role / Device Role / Timing Role: Channel-select amplifier with fast enable/disable (250 ns on / 560 ns off) to minimize inter-channel crosstalk. Use Value: Shutdown current <50 μA cuts idle power per channel; 47 dB crosstalk rejection at 5 MHz prevents signal bleed. | Use Scenario: Signal conditioning stage in Bluetooth LE audio headset, amplifying MEMS microphone output before ADC. IC Role / Device Role / Timing Role: Low-noise (17 nV/√Hz), low-power preamplifier operating from single 3.3 V Li-ion cell. Use Value: 650 μA supply current extends battery life; rail-to-rail I/O matches 3.3 V ADC reference without external biasing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-power amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6645MAX/NOPB | No shutdown pin; SOT-23-5 package; identical bandwidth, slew rate, and noise specs. | Fixed-always-on operation; unsuitable for power-gated or time-multiplexed systems. | Select when shutdown functionality is unnecessary and board space permits removal of control logic. |
| TLV2782CDR | Lower bandwidth (10 MHz), lower supply current (420 μA), no rail-to-rail output (60 mV from rails). | Battery life prioritized over speed; acceptable for <100 kHz sensor signals with relaxed dynamic range. | Choose for ultra-low-power, sub-MHz applications where 55 MHz BW and 20 mV rail swing are not required. |
Compared with LMH6645MAX/NOPB, LMH6647MAX/NOPB adds shutdown control at minor cost in package size and pin count; compared with TLV2782CDR, it trades 230 μA higher quiescent current for 5.5× bandwidth, 2.2× slew rate, and rail-to-rail output - making it optimal for multiplexed, high-fidelity portable signal chains.
Availability
LMH6647MAX/NOPB is available at Aetrix Electronics and suitable for active filters, current sense buffers, multiplexing applications, and high-speed portable devices requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LMH6647MAX/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 power-sensitive systems - combining rail-to-rail operation, micro-power shutdown, and robust AC performance from 2.7 V supplies.
FAQ
What is the maximum supply voltage rating for LMH6647MAX/NOPB?
The absolute maximum supply voltage (V+ − V−) for LMH6647MAX/NOPB is 12.6 V, with recommended operating range from 2.5 V to 12 V. Operation at 12 V is supported across −40°C to +85°C, and electrical characteristics such as 55 MHz bandwidth and 22 V/μs slew rate remain valid up to this limit per TI SNOS970D Rev D specifications.
Does LMH6647MAX/NOPB support true rail-to-rail input and output?
Yes, LMH6647MAX/NOPB supports rail-to-rail input - accepting common-mode voltages from V− − 0.3 V to V+ + 0.3 V - and rail-to-rail output - swinging within 20 mV of both supply rails at RL = 1 kΩ. This is confirmed in the "Description" and "Electrical Characteristics" sections of the official datasheet (SNOS970D), enabling direct interface with 3.3 V or 2.7 V ADCs without external biasing.
What is the shutdown pin behavior of LMH6647MAX/NOPB?
The shutdown pin (SD, pin 5) of LMH6647MAX/NOPB is active-high: device enters low-current shutdown (<50 μA) when SD voltage exceeds 2.30 V (min) at 2.7 V supply, and exits shutdown when SD falls below 1.95 V (max). Turn-on time is 250 ns (typ), turn-off time is 560 ns (typ), and shutdown pin input current remains ≤20 μA - verified in Electrical Characteristics tables for 2.7 V, 5 V, and ±5 V operation.
Can LMH6647MAX/NOPB drive a 50 Ω load effectively?
LMH6647MAX/NOPB is not optimized for continuous 50 Ω driving: its specified linear output current is ±20 mA at 0.5 V from rails, corresponding to ~25 Ω minimum resistive load for full swing. Driving 50 Ω may cause clipping or thermal stress; for 50 Ω applications, use external buffering or select a current-feedback amplifier like THS3201. Datasheet Figure 6 confirms output swing degradation below RL = 200 Ω.
What is the input voltage noise density of LMH6647MAX/NOPB at 100 kHz?
The input voltage noise density of LMH6647MAX/NOPB is 17 nV/√Hz at 100 kHz, as specified in the "Electrical Characteristics" tables for 2.7 V, 5 V, and ±5 V supply conditions (SNOS970D Rev D, Section 7.5–7.7). This value is typical and applies across the full −40°C to +85°C operating temperature range, supporting low-noise signal chain design in precision analog front-ends.
LMH6647MAX/NOPB 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:
- 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
LMH6647MAX/NOPB FAQ
1.How can I place an order for LMH6647MAX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6647MAX/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 LMH6647MAX/NOPB reliable?
The price and inventory of LMH6647MAX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6647MAX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6647MAX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6647MAX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6647MAX/NOPB?
LMH6647MAX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6647MAX/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 LMH6647MAX/NOPB?
For technical support, including LMH6647MAX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6647MAX/NOPB requirements.
6.How does Aetrix verify that LMH6647MAX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6647MAX/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 LMH6647MAX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6647MAX/NOPB?
All LMH6647MAX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6647MAX/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 LMH6647MAX/NOPB part is unused and in its original packaging.
Return procedure for LMH6647MAX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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