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Texas Instruments LMH6646MAX
- Part No.:
- LMH6646MAX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6646MAX.pdf
- Description:
- IC VOLTAGE FEEDBACK 2 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,964
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Product details
Overview
LMH6646MAX from Texas Instruments is a dual, rail-to-rail input and output voltage feedback amplifier optimized for low-voltage, low-power, high-speed applications. It delivers 55 MHz −3 dB bandwidth, 22 V/μs slew rate, and ±20 mA linear output current per channel at 2.7 V supply, with 650 μA/channel quiescent current. It operates from 2.5 V to 12 V supplies and supports precision signal conditioning in portable instrumentation and sensor interfaces.
For engineers reviewing the LMH6646MAX datasheet, LMH6646MAX pinout, LMH6646MAX application, or LMH6646MAX equivalent, key selection considerations include its rail-to-rail I/O capability, shutdown-free dual-channel architecture (unlike LMH6647), 20 mV output swing from rails at 1 kΩ load, and verified crosstalk rejection of 47 dB at 5 MHz - critical for multi-channel signal integrity in compact analog front-ends.
Technical Context
The LMH6646MAX uses Texas Instruments' VIP10 dielectrically isolated bipolar process to achieve high fT (~8 GHz) under low bias, enabling stable 55 MHz bandwidth across 2.7–12 V supply range. Its rail-to-rail input stage extends common-mode range 0.3 V beyond either supply, while the Class A-B "turn-around" input stage minimizes offset drift and noise without increasing power.
The output employs a common-emitter push-pull topology delivering ±20 mA into loads while maintaining 20 mV rail-to-rail swing at light loads. Performance parameters-including bandwidth, slew rate, and output current-exhibit minimal variation over supply voltage and temperature (−40°C to +85°C), simplifying design across battery-powered and industrial operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 55 MHz at AV = +1 - enables accurate amplification of signals up to video and medium-speed data acquisition frequencies. |
| Slew Rate | 22 V/μs - supports clean 10 VPP output at 350 kHz without slewing distortion. |
| Supply Current | 650 μA per channel - allows dual-channel operation from coin-cell or single Li-ion sources with minimal impact on system runtime. |
| Input Voltage Noise | 17 nV/√Hz at 100 kHz - preserves SNR in low-level sensor signal chains (e.g., strain gauges, thermopiles). |
| Output Swing | Within 20 mV of both rails at 1 kΩ load - maximizes dynamic range in 3.3 V or lower single-supply systems. |
| Crosstalk Rejection | 47 dB at 5 MHz - ensures channel isolation in dual-signal paths such as differential sensor pairs or multiplexed ADC drivers. |
| Input Common-Mode Range | Extends 0.3 V beyond V− and V+ - accepts inputs at ground or VCC in single-supply configurations without level-shifting. |
Pinout & Package
LMH6646MAX is supplied in an SOIC-8 (D08A) package measuring 4.90 mm × 3.91 mm, with standard 1.27 mm pitch and exposed pad not present. Pin functions are electrically validated per TI SNOS970D Rev D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load directly; rail-to-rail swing supports full-scale ADC interfacing. |
| 2 | −IN A | Inverting input for Channel A - forms feedback node in inverting configurations; high impedance (3 MΩ) minimizes loading. |
| 3 | +IN A | Non-inverting input for Channel A - accepts signals from 0.3 V below V− to 0.3 V above V+ without phase reversal. |
| 4 | V− | Negative supply terminal - referenced to ground in single-supply use; must be decoupled locally. |
| 5 | V+ | Positive supply terminal - supports 2.5–12 V operation; PSRR > 75 dB reduces supply noise coupling. |
| 6 | −IN B | Inverting input for Channel B - electrically isolated from Channel A; crosstalk rejection ≥47 dB prevents inter-channel interference. |
| 7 | +IN B | Non-inverting input for Channel B - identical CMVR and noise specs as Channel A for matched dual-path designs. |
| 8 | OUT B | Amplifier B output - independent output stage; no shared internal nodes with OUT A ensures true dual-channel operation. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables direct interface with 0–VCC sensors and single-supply ADCs without external level-shifting circuitry. |
| 55 MHz bandwidth at 2.7 V | Maintains high-frequency response even at lowest operating voltage - critical for battery-voltage scaling in portable devices. |
| 650 μA/channel supply current | Supports always-on dual-channel signal conditioning in energy-constrained IoT endpoints and wearables. |
| 47 dB crosstalk rejection (5 MHz) | Preserves signal fidelity in dual-channel applications like stereo audio preamps or differential transducer pairs. |
| ±20 mA linear output drive | Drives 1 kΩ loads to rail while maintaining <0.1% THD - eliminates need for external buffer stages in moderate-drive applications. |
| 0.3 V beyond-rail input range | Accepts inputs at ground or VCC in single-supply systems - simplifies biasing of AC-coupled or DC-coupled sensors. |
Applications
| Active Filter Design | Portable Instrumentation |
|---|---|
Use Scenario: Second-order Sallen-Key low-pass filter with 20 MHz cutoff for anti-aliasing before a 40 MSPS ADC in handheld test equipment. IC Role / Device Role / Timing Role: Dual-channel op-amp implementing two cascaded filter stages - Channel A as integrator, Channel B as gain stage - with matched bandwidth and phase response. Use Value: 55 MHz GBW and 22 V/μs slew rate ensure minimal group delay distortion and step response fidelity across the filter passband. | Use Scenario: Dual-channel signal conditioning for simultaneous temperature and pressure sensing in a battery-powered environmental monitor. IC Role / Device Role / Timing Role: Rail-to-rail I/O amplifier buffering thermistor and piezoresistive bridge outputs into a shared 12-bit SAR ADC. Use Value: 650 μA/channel quiescent current extends battery life; 20 mV output swing maximizes usable ADC code range from 3.3 V supply. |
| Current Sense Amplification | High-Speed Transducer Interface |
Use Scenario: Bidirectional current sensing across a 10 mΩ shunt in a 5 V motor control H-bridge, requiring ±20 A measurement range. IC Role / Device Role / Timing Role: Dual-op-amp configured as high-side and low-side current sense amplifiers - one per direction - with matched gain and offset. Use Value: Input common-mode range extending 0.3 V beyond rails allows direct connection to shunt terminals at VBUS and GND without level shifters. | Use Scenario: Signal conditioning for a 10 MHz ultrasonic transducer in a portable medical imaging probe. IC Role / Device Role / Timing Role: Dual-channel amplifier providing gain and buffering for transmit pulse shaping and receive signal amplification in time-multiplexed mode. Use Value: 47 dB crosstalk rejection prevents transmit leakage from corrupting weak echo signals; 55 MHz bandwidth preserves pulse fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed rail-to-rail amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6644MMX | Quad-channel, same 55 MHz BW and 650 μA/channel, but in VSSOP-16 package; no shutdown pin. | Higher channel density for space-constrained PCBs; requires more routing layers due to 16-pin layout. | Select when four matched channels are needed and board area permits VSSOP-16 footprint. |
| OPA2350UA | 22 MHz BW, 38 V/μs slew rate, 4.4 mA/channel supply current; CMOS input, lower input bias current (0.2 pA). | Better for ultra-low-input-bias applications (e.g., photodiode amps); insufficient bandwidth for >20 MHz signal paths. | Select only if bandwidth demand ≤22 MHz and input bias current <1 pA is mandatory - not a drop-in replacement. |
Compared with LMH6644MMX and OPA2350UA, the LMH6646MAX uniquely balances 55 MHz bandwidth, rail-to-rail I/O, and sub-1 mA dual-channel power - making it optimal for portable, medium-bandwidth analog front-ends where channel count, speed, and efficiency intersect.
Availability
LMH6646MAX is available at Aetrix Electronics and suitable for active filter design, portable instrumentation, current sense amplification, and high-speed transducer interface applications requiring stable component supply, consistent parametric performance, and long-term industrial availability.
Supply support for LMH6646MAX 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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad industrial, automotive, and consumer market reach.
The LMH664x product line was designed specifically for low-voltage, high-speed signal conditioning in portable and battery-operated systems - emphasizing rail-to-rail operation, micro-power efficiency, and robust AC performance from 2.7 V.
FAQ
What is the maximum supply voltage rating for LMH6646MAX?
The absolute maximum supply voltage (V+ − V−) for LMH6646MAX is 12.6 V, with recommended operating range from 2.5 V to 12 V. Operation at 12 V is supported across the full −40°C to +85°C temperature range, and electrical characteristics including 55 MHz bandwidth and 22 V/μs slew rate remain valid per TI SNOS970D Rev D.
Does LMH6646MAX include a shutdown pin?
No, LMH6646MAX does not include a shutdown pin. Shutdown functionality is exclusive to the LMH6647 (single-channel) variant. The LMH6646MAX is a dual-channel amplifier with fixed operation - all pins are signal or supply terminals, and no control pin is allocated for power-down mode.
What is the typical input offset voltage for LMH6646MAX over temperature?
The typical input offset voltage for LMH6646MAX is ±1 mV at 25°C, with guaranteed limits of −4 mV to +4 mV across −40°C to +85°C. Its average offset drift is ±5 μV/°C, resulting in worst-case offset shift of ±0.4 mV over the full temperature range - confirmed in TI's Electrical Characteristics tables for 2.7 V, 5 V, and ±5 V supplies.
Can LMH6646MAX drive a 50 Ω load effectively?
LMH6646MAX is not optimized for continuous 50 Ω driving: its specified linear output current is ±20 mA at 0.5 V from rails, supporting ≥250 Ω loads at full swing. Driving 50 Ω may cause thermal stress and distortion; for 50 Ω applications, consider dedicated high-current drivers like THS3201 or buffer stages. TI's typical performance curves show significant output swing compression below 200 Ω.
Is LMH6646MAX pin-compatible with other devices in the LMH664x family?
LMH6646MAX (SOIC-8) shares identical pinout with LMH6645 (SOIC-8 single-channel) for pins 1–4 and 5–8, but LMH6645 lacks Channel B pins (6 and 7 are N/C). It is not pin-compatible with LMH6647 (SOT-23-6 or SOIC-8 with SD pin), which repurposes pins for shutdown control. Always verify pin function mapping per device datasheet before substitution.
LMH6646MAX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 2
- 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 (x2 Channels)
- 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
LMH6646MAX FAQ
1.How can I place an order for LMH6646MAX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6646MAX 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 LMH6646MAX reliable?
The price and inventory of LMH6646MAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6646MAX is usually 5 days.
3.What payment methods are accepted for LMH6646MAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6646MAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6646MAX?
LMH6646MAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6646MAX 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 LMH6646MAX?
For technical support, including LMH6646MAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6646MAX requirements.
6.How does Aetrix verify that LMH6646MAX is sourced from the original manufacturer or authorized distributors?
All LMH6646MAX 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 LMH6646MAX meets industry standards.
7.What is the process for return or replacement of LMH6646MAX?
All LMH6646MAX units undergo pre-shipment inspection (PSI). If there is an issue with LMH6646MAX, 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 LMH6646MAX part is unused and in its original packaging.
Return procedure for LMH6646MAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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