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Texas Instruments LMH6646MM
- Part No.:
- LMH6646MM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6646MM.pdf
- Description:
- IC OPAMP VFB 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,675
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Product details
Overview
LMH6646MM from Texas Instruments is a dual, rail-to-rail input and output voltage feedback operational 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 LMH6646MM datasheet, LMH6646MM pinout, LMH6646MM application, or LMH6646MM equivalent, key selection criteria include rail-to-rail I/O swing (20 mV from rails), input common-mode range extending 0.3 V beyond supplies, 17 nV/√Hz input voltage noise, crosstalk rejection of 47 dB at 5 MHz, and VSSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LMH6646MM uses a proprietary VIP10 dielectrically isolated bipolar process enabling high fT (~8 GHz) under low 2.7 V bias. Its architecture integrates a Class A-B "turn-around" input stage for low offset/noise and a common-emitter push-pull output stage delivering rail-to-rail swing with ±20 mA drive capability at minimal quiescent current.
Performance remains stable across 2.5–12 V supply range: −3 dB bandwidth (55 MHz), slew rate (22 V/μs), and output current (±20 mA) show minimal variation. Input common-mode voltage extends 0.3 V beyond either rail, and CMRR exceeds 76 dB at DC, supporting accurate amplification in single-supply configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 55 MHz - Enables high-fidelity amplification of signals up to ~35 MSPS in closed-loop gain ≥ +1 configurations. |
| Slew Rate | 22 V/μs - Supports clean 10 VPP output at 350 kHz without slewing distortion. |
| Supply Current | 650 μA/channel - Allows dual-channel operation at <1.3 mA total, critical for battery-powered devices. |
| Input Voltage Noise | 17 nV/√Hz @ 100 kHz - Preserves SNR in low-amplitude sensor front-ends (e.g., thermopile, bridge outputs). |
| Output Swing | Within 20 mV of either rail - Maximizes dynamic range in 3.3 V or lower systems, avoiding headroom loss. |
| Crosstalk Rejection | 47 dB @ 5 MHz - Ensures channel isolation in dual-path signal chains (e.g., I/Q demodulation, stereo audio buffers). |
| Input Common-Mode Range | Extends 0.3 V beyond rails - Simplifies level-shifting in single-supply data acquisition with ground-referenced inputs. |
| CMRR | ≥76 dB - Maintains accuracy when amplifying small differential signals in noisy industrial environments. |
Pinout & Package
VSSOP-8 package (3.00 mm × 3.00 mm body size), thermally enhanced for compact, high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (Pin 1) | Amplifier A output | Delivers rail-to-rail buffered signal; capable of ±20 mA into loads tied to mid-supply or rails. |
| −IN A (Pin 2) | Inverting input Channel A | Differential node for inverting configurations; supports common-mode voltage up to V− − 0.3 V or V+ + 0.3 V. |
| +IN A (Pin 3) | Non-inverting input Channel A | High-impedance input (3 MΩ) for unity-gain buffers or non-inverting gain stages. |
| V− (Pin 4) | Negative supply | Reference for dual-supply operation or ground in single-supply; must be stable and low-impedance. |
| V+ (Pin 5) | Positive supply | Accepts 2.5–12 V; PSRR ≥75 dB ensures immunity to supply ripple in mixed-signal systems. |
| −IN B (Pin 6) | Inverting input Channel B | Independent input for second signal path; crosstalk rejection >47 dB prevents inter-channel interference. |
| +IN B (Pin 7) | Non-inverting input Channel B | Matches Pin 3 electrical characteristics; enables matched dual-channel design without performance mismatch. |
| OUT B (Pin 8) | Amplifier B output | Electrically identical to Pin 1; supports independent loading and routing for differential or parallel processing. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization in 2.7 V–3.3 V systems without external level-shifting circuitry. |
| 650 μA/channel supply current | Permits dual op-amp integration in always-on sensor nodes with multi-year battery life at µA-level sleep currents. |
| 55 MHz bandwidth at AV = +1 | Supports wideband active filtering (e.g., anti-aliasing, reconstruction) with minimal phase error up to 10 MHz. |
| 17 nV/√Hz input voltage noise | Preserves resolution in 16-bit+ ADC driver applications where thermal noise dominates quantization floor. |
| 47 dB crosstalk rejection at 5 MHz | Ensures integrity in dual-channel applications like analog front-ends for simultaneous sampling ADCs or stereo line drivers. |
| Input common-mode range beyond rails | Eliminates need for external bias resistors when interfacing with ground-referenced transducers in single-supply systems. |
Applications
| Active Filter Design | Portable Sensor Interface |
|---|---|
Use Scenario: Second-order Sallen-Key low-pass filter for anti-aliasing before a 1 MSPS SAR ADC in handheld test equipment. IC Role / Device Role / Timing Role: Dual op-amp implements both integrator and gain stages with matched AC response and low noise. Use Value: 55 MHz bandwidth ensures filter cutoff stability across temperature; rail-to-rail I/O maximizes SNR by utilizing full ADC input range. | Use Scenario: Signal conditioning for a MEMS accelerometer in a wearable health monitor powered by a 3.0 V coin cell. IC Role / Device Role / Timing Role: Single-supply buffer and gain stage translating ±100 mV differential output to 0–3.0 V single-ended signal. Use Value: 650 μA/channel current enables continuous operation for >1 year on battery; 20 mV rail swing preserves 99% dynamic range. |
| Current Sense Amplification | High-Speed Multiplexer Driver |
Use Scenario: Bidirectional current sensing across a 10 mΩ shunt in a USB-C power delivery controller. IC Role / Device Role / Timing Role: Precision gain-of-100 amplifier with rail-to-rail output driving an ADC input referenced to 1.2 V. Use Value: Input common-mode range extending below ground allows accurate measurement of negative current flow without level shifters. | Use Scenario: Output buffer for an 8:1 analog multiplexer in automated test equipment requiring fast settling and low glitch energy. IC Role / Device Role / Timing Role: Dual-channel driver providing matched settling (<250 ns to ±1%) and low crosstalk between adjacent channels. Use Value: 22 V/μs slew rate and 47 dB crosstalk rejection ensure clean channel switching at 100 kSPS without inter-channel corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual rail-to-rail op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2772IDGKR | Lower bandwidth (2.5 MHz), higher supply current (1.3 mA/channel), but lower input offset (1.5 mV typ vs. 1 mV typ for LMH6646MM). | Better for DC-precision, low-frequency sensor buffering; unsuitable for >1 MHz signal paths. | Select TLV2772IDGKR only when offset and drift dominate over speed and power. |
| OPA2350UA | Higher bandwidth (38 MHz), lower noise (7 nV/√Hz), but no rail-to-rail input (input range limited to V− + 0.5 V to V+ − 1.5 V). | Preferred for high-SNR, medium-speed ADC drivers where input common-mode constraints allow. | Choose OPA2350UA when noise-critical 10–20 MHz applications permit non-rail-to-rail input compliance. |
Compared with TLV2772IDGKR and OPA2350UA, the LMH6646MM uniquely balances 55 MHz bandwidth, rail-to-rail I/O, and sub-1 mA total quiescent current-making it optimal for portable, wideband, single-supply systems where dynamic range, speed, and battery life are co-constrained.
Availability
LMH6646MM is available at Aetrix Electronics and suitable for active filter design, portable sensor interface, current sense amplification, and high-speed multiplexer driver applications requiring stable component supply, consistent parametric performance across temperature, and long-term manufacturing continuity.
Supply support for LMH6646MM 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 solutions, with leadership in high-performance op-amps, data converters, and power management ICs.
The LMH6646MM belongs to the LMH664x family of rail-to-rail I/O amplifiers designed specifically for low-voltage, high-speed signal conditioning in portable, medical, and industrial instrumentation where bandwidth, power efficiency, and input/output flexibility are simultaneously critical.
FAQ
What is the maximum supply voltage range supported by the LMH6646MM?
The LMH6646MM operates across a supply voltage range of 2.5 V to 12 V, supporting both single-supply (e.g., 3.3 V, 5 V) and split-supply (e.g., ±5 V) configurations. Absolute maximum rating is 12.6 V (V+ − V−), and operation above 12 V risks permanent damage. At 2.7 V, it maintains full 55 MHz bandwidth and 22 V/μs slew rate-key for ultra-low-power designs.
Does the LMH6646MM have shutdown capability?
No, the LMH6646MM does not include a shutdown pin. Shutdown functionality is exclusive to the LMH6647 (single-channel variant with SD pin). The LMH6646MM is a dual-channel amplifier without enable/disable control; power management must be handled externally via supply sequencing or system-level sleep modes.
What is the typical input offset voltage of the LMH6646MM and how does it vary with temperature?
The LMH6646MM has a typical input offset voltage of ±1 mV at 25°C, with a maximum of ±4 mV over the full −40°C to +85°C operating range. Its average input offset drift is ±5 μV/°C, meaning offset changes by no more than ±0.5 mV across a 100°C span-suitable for precision DC-coupled applications requiring stability over environmental variation.
Can the LMH6646MM drive a 50 Ω load directly?
The LMH6646MM is not optimized for direct 50 Ω driving: its specified ±20 mA linear output current corresponds to loads ≥500 Ω at rail-swing conditions. Driving 50 Ω continuously risks thermal overload and output clipping. For 50 Ω transmission lines, use a series resistor (e.g., 450 Ω) to isolate the op-amp while maintaining impedance match and preserving 22 V/μs slew performance.
Which package options are available for the LMH6646MM and what are their thermal characteristics?
The LMH6646MM is exclusively offered in the VSSOP-8 package (DGK08A, 3.00 mm × 3.00 mm). Its junction-to-ambient thermal resistance (RθJA) is 190°C/W under standard JEDEC PCB conditions. This enables reliable operation up to +85°C ambient at full 650 μA/channel current, provided adequate copper pour and airflow are maintained on the PCB.
LMH6646MM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-VSSOP
LMH6646MM FAQ
1.How can I place an order for LMH6646MM through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6646MM 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 LMH6646MM reliable?
The price and inventory of LMH6646MM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6646MM is usually 5 days.
3.What payment methods are accepted for LMH6646MM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6646MM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6646MM?
LMH6646MM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6646MM 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 LMH6646MM?
For technical support, including LMH6646MM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6646MM requirements.
6.How does Aetrix verify that LMH6646MM is sourced from the original manufacturer or authorized distributors?
All LMH6646MM 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 LMH6646MM meets industry standards.
7.What is the process for return or replacement of LMH6646MM?
All LMH6646MM units undergo pre-shipment inspection (PSI). If there is an issue with LMH6646MM, 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 LMH6646MM part is unused and in its original packaging.
Return procedure for LMH6646MM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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