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Texas Instruments LMH6646MM/NOPB
- Part No.:
- LMH6646MM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6646MM/NOPB.pdf
- Description:
- IC OPAMP VFB 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,304
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Product details
Overview
LMH6646MM/NOPB 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 650 μA supply current per channel, operating from 2.5 V to 12 V supplies. It is used in active filters and current sense buffers where precision, speed, and rail-to-rail swing are critical.
For engineers reviewing the LMH6646MM/NOPB datasheet, LMH6646MM/NOPB pinout, LMH6646MM/NOPB application, or LMH6646MM/NOPB equivalent, key selection considerations include its dual-channel VSSOP-8 package, shutdown-incompatible design (no SD pin), rail-to-rail I/O capability down to 20 mV from rails, and verified crosstalk rejection of 47 dB at 5 MHz - all confirmed for the exact LMH6646 variant.
Technical Context
The LMH6646MM/NOPB implements a proprietary VIP10 dielectrically isolated bipolar process enabling high fT (~8 GHz) under low 2.7 V supply and low bias current. Its input stage supports common-mode voltage beyond either rail by 0.3 V, and its push-pull output stage delivers ±20 mA while maintaining rail-to-rail swing within 20 mV at light loads.
Performance remains stable across supply voltages (2.5–12 V): −3 dB bandwidth stays at 55 MHz, slew rate holds at 22 V/μs, and output current sustains ±20 mA regardless of VS. It exhibits 17 nV/√Hz input voltage noise at 100 kHz and 47 dB crosstalk rejection between channels at 5 MHz - both measured and specified for the LMH6646 dual configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 55 MHz - enables accurate amplification of signals up to ~35 MHz in unity-gain stable configurations. |
| Slew Rate | 22 V/μs - supports clean 10 VPP output at 350 kHz without slewing distortion. |
| Supply Current per Channel | 650 μA - allows dual-channel operation from coin-cell or single Li-ion sources with minimal quiescent load. |
| Input Voltage Noise | 17 nV/√Hz at 100 kHz - suitable for precision sensor interfaces where signal integrity below 100 kHz matters. |
| Crosstalk Rejection | 47 dB at 5 MHz - ensures channel isolation in dual-path signal conditioning (e.g., differential pair buffering). |
| Output Swing | Within 20 mV of either rail - preserves dynamic range in 3.3 V or lower single-supply systems. |
| Input Common-Mode Range | Extends 0.3 V beyond rails - accepts inputs at GND or VCC in single-supply configurations without clipping. |
Pinout & Package
VSSOP-8 package (3.00 mm × 3.00 mm body size), thermally enhanced for high-speed analog operation in space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load; rail-to-rail capable, ±20 mA sourcing/sinking. |
| 2 | IN− A | Inverting input for Channel A - high-impedance node (3 MΩ RIN, 2 pF CIN) for feedback network connection. |
| 3 | IN+ A | Non-inverting input for Channel A - accepts signals from 0.3 V below V− to 0.3 V above V+. |
| 4 | V− | Negative supply rail - shared reference for both amplifiers; supports single-supply (0 V) or split-supply (−5 V) operation. |
| 5 | V+ | Positive supply rail - powers both channels; operates from 2.5 V to 12 V with stable AC performance. |
| 6 | IN− B | Inverting input for Channel B - electrically isolated from Channel A; 47 dB crosstalk rejection at 5 MHz confirmed. |
| 7 | IN+ B | Non-inverting input for Channel B - identical input specs to IN+ A; enables independent dual-path signal processing. |
| 8 | OUT B | Amplifier B output - fully independent output stage; no internal shutdown or enable control. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal handling in 2.7 V–3.3 V systems without level-shifting circuitry. |
| 55 MHz bandwidth at 650 μA/channel | Delivers high-speed response while consuming <1.3 mW total at 2.7 V - critical for battery-powered instrumentation. |
| 47 dB inter-channel crosstalk rejection | Validated at 5 MHz for LMH6646 - ensures signal integrity in dual-channel applications like I/Q demodulation or stereo buffering. |
| Input common-mode range beyond rails | Accepts inputs at GND or VCC in single-supply use - eliminates need for biasing resistors in many transducer interfaces. |
| Stable AC performance across 2.5–12 V supply | Bandwidth, slew rate, and output drive remain consistent - simplifies design reuse across multiple power domains. |
Applications
| Active Filters | Current Sense Buffer |
|---|---|
Use Scenario: Second-order Sallen-Key low-pass filter in motor control feedback loop operating from 3.3 V supply. IC Role / Device Role / Timing Role: Dual op-amp implementing filter transfer function with matched gain and phase response across channels. Use Value: 55 MHz bandwidth ensures >20× oversampling margin for 1.5 MHz PWM switching harmonics; rail-to-rail I/O preserves SNR over full 0–3.3 V sensed range. |
Use Scenario: Bidirectional shunt-based current measurement in portable medical device with 0–3.3 V ADC input range. IC Role / Device Role / Timing Role: Precision buffer isolating low-impedance shunt from ADC input while rejecting common-mode noise. Use Value: Input common-mode range extending 0.3 V beyond rails allows direct connection to shunt placed at either supply rail; 17 nV/√Hz noise minimizes added uncertainty. |
| High-Speed Portable Devices | Multiplexing Applications |
Use Scenario: Signal conditioning front-end for ultrasound transducer array in handheld diagnostic tool powered by single-cell Li-ion. IC Role / Device Role / Timing Role: Dual-channel amplifier providing gain and drive for time-of-flight echo signals before digitization. Use Value: 22 V/μs slew rate supports fast-rising echo pulses; 650 μA/channel current enables >10-hour battery life with 2-channel active mode. |
Use Scenario: Dual-channel multiplexer driver in automated test equipment routing analog signals between DUT and measurement instruments. IC Role / Device Role / Timing Role: Independent amplifiers driving two parallel signal paths with minimal interaction during switching. Use Value: 47 dB crosstalk rejection at 5 MHz prevents signal bleed-through during simultaneous path activation; VSSOP-8 footprint saves board area in dense backplane designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed rail-to-rail op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2772IDR | Lower bandwidth (10 MHz), higher supply current (1.3 mA/channel), no crosstalk spec provided. | Not suitable for >5 MHz signal paths or ultra-low-power portable designs. | Choose only if cost sensitivity outweighs speed and power requirements. |
| OPA2350UA | Higher bandwidth (38 MHz), higher noise (7 nV/√Hz), no crosstalk data published for dual version. | Lacks verified inter-channel isolation - unsuitable for tightly coupled dual-path systems like I/Q processing. | Select when ultra-low noise dominates over crosstalk control and bandwidth margin is acceptable. |
Compared with TLV2772IDR and OPA2350UA, LMH6646MM/NOPB uniquely balances 55 MHz bandwidth, 650 μA/channel quiescent current, and measured 47 dB crosstalk - making it the only option among the three validated for dual-channel high-fidelity signal routing at multi-MHz frequencies.
Availability
LMH6646MM/NOPB is available at Aetrix Electronics and suitable for active filters, current sense buffers, high-speed portable devices, and multiplexing applications requiring stable component supply, long-term industrial availability, and guaranteed traceable sourcing.
Supply support for LMH6646MM/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 op-amps, data converters, and power management ICs.
The LMH6646MM/NOPB belongs to TI's 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, and precision must coexist.
FAQ
What is the maximum supply voltage for LMH6646MM/NOPB?
The absolute maximum supply voltage (V+ − V−) for LMH6646MM/NOPB is 12.6 V, with recommended operating range from 2.5 V to 12 V. Electrical characteristics including 55 MHz bandwidth and 22 V/μs slew rate are guaranteed across this full range, enabling flexible use in both low-voltage portable and higher-voltage industrial systems without performance degradation.
Does LMH6646MM/NOPB have a shutdown pin?
No, LMH6646MM/NOPB does not include a shutdown pin. Shutdown functionality is exclusive to the LMH6647 (single-channel) variant. The LMH6646MM/NOPB is a dual-channel amplifier with fixed operation - all pins are signal or supply related (OUT A/B, IN± A/B, V+, V−). No SD or enable terminal exists in its VSSOP-8 pinout.
What is the input common-mode voltage range of LMH6646MM/NOPB?
The input common-mode voltage range of LMH6646MM/NOPB extends 0.3 V beyond either supply rail - from (V− − 0.3 V) to (V+ + 0.3 V) - verified across −40°C to +85°C. This allows direct interface to ground-referenced sensors or rail-tied sources in single-supply configurations without external bias networks.
Is LMH6646MM/NOPB suitable for driving capacitive loads?
LMH6646MM/NOPB maintains stability with moderate capacitive loads: typical settling time to ±1% is 250 ns with 13 pF load at unity gain. For loads >100 pF, external series resistance (≥50 Ω) at the output is recommended to prevent peaking or oscillation, as confirmed in Figure 17 of the SNOS970D datasheet.
What package type is used for LMH6646MM/NOPB?
LMH6646MM/NOPB is supplied in an 8-pin VSSOP (Very Small Outline Package) with 3.00 mm × 3.00 mm body size and 0.65 mm lead pitch. This thermally enhanced package supports high-speed analog performance in compact PCB layouts and is distinct from SOIC-8 and SOT-23 variants used for other members of the LMH664x family.
LMH6646MM/NOPB 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:
- Active
- 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/NOPB FAQ
1.How can I place an order for LMH6646MM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6646MM/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 LMH6646MM/NOPB reliable?
The price and inventory of LMH6646MM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6646MM/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6646MM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6646MM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6646MM/NOPB?
LMH6646MM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6646MM/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 LMH6646MM/NOPB?
For technical support, including LMH6646MM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6646MM/NOPB requirements.
6.How does Aetrix verify that LMH6646MM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6646MM/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 LMH6646MM/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6646MM/NOPB?
All LMH6646MM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6646MM/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 LMH6646MM/NOPB part is unused and in its original packaging.
Return procedure for LMH6646MM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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