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Texas Instruments LMH6646MMX
- Part No.:
- LMH6646MMX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6646MMX.pdf
- Description:
- IC OPAMP VFB 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,676
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Product details
Overview
LMH6646MMX 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) with 2.7 V to 12 V operation - enabling precision signal conditioning in battery-powered portable instrumentation and sensor interfaces.
For engineers reviewing the LMH6646MMX datasheet, LMH6646MMX pinout, LMH6646MMX application, or LMH6646MMX equivalent, key selection criteria include its rail-to-rail I/O capability down to 20 mV from rails, 17 nV/√Hz input voltage noise at 100 kHz, cross-talk rejection of 47 dB (at 5 MHz), and guaranteed performance across −40°C to +85°C industrial temperature range.
Technical Context
The LMH6646MMX employs a proprietary VIP10 dielectrically isolated bipolar process enabling high fT (~8 GHz) under low 2.7 V supply and low bias current. Its rail-to-rail input stage extends common-mode range 0.3 V beyond either supply rail, while the Class A-B "turn-around" input stage reduces offset drift and power dissipation versus comparable-speed amplifiers.
The output stage uses a common-emitter push-pull topology delivering ±20 mA into loads within 20 mV of V+ or V−, maintaining consistent 55 MHz bandwidth and 22 V/μs slew rate across 2.7 V–12 V supply range - critical for stable gain and phase response in active filters and transducer interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 55 MHz at AV = +1 - supports high-fidelity signal amplification up to video and ultrasonic frequencies without gain peaking. |
| Slew Rate | 22 V/μs - enables clean 1 VPP step response with <40 ns rise time, suitable for fast pulse conditioning. |
| Supply Current | 650 μA per channel at 2.7 V - allows dual-channel high-speed amplification in space-constrained, battery-operated systems. |
| Input Voltage Noise | 17 nV/√Hz at 100 kHz - preserves SNR in low-level sensor front-ends like current sense buffers and transducer amps. |
| Cross-Talk Rejection | 47 dB at 5 MHz - ensures channel isolation in dual-channel configurations such as differential line drivers or multiplexed signal paths. |
| Output Swing | Within 20 mV of either rail at RL = 1 kΩ - maximizes dynamic range in single-supply 3.3 V or lower systems. |
| Input Common-Mode Range | Extends 0.3 V beyond V− and V+ - simplifies interfacing with ground-referenced sensors or DAC outputs without level-shifting. |
Pinout & Package
VSSOP-8 package (3.00 mm × 3.00 mm body size) with exposed thermal pad; pin-compatible with SOIC-8 but with 38% smaller footprint and improved thermal resistance (RθJA = 190°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (Pin 1) | Output Channel A | Amplified output of Channel A; capable of sourcing/sinking ±20 mA within 20 mV of rails. |
| −IN A (Pin 2) | Inverting Input Channel A | Differential input node for Channel A; supports rail-to-rail common-mode voltage (−0.3 V to V+ +0.3 V). |
| +IN A (Pin 3) | Non-inverting Input Channel A | Differential input node for Channel A; identical CMVR and impedance to −IN A. |
| V− (Pin 4) | Negative Supply | Ground reference in single-supply operation or negative rail in split-supply; must be decoupled locally. |
| V+ (Pin 5) | Positive Supply | Primary power rail (2.7 V–12 V); supplies both channels; requires 0.1 μF ceramic bypass to V−. |
| −IN B (Pin 6) | Inverting Input Channel B | Differential input node for Channel B; electrically isolated from Channel A with 47 dB cross-talk rejection at 5 MHz. |
| +IN B (Pin 7) | Non-inverting Input Channel B | Differential input node for Channel B; matched offset and noise characteristics to Channel A inputs. |
| OUT B (Pin 8) | Output Channel B | Amplified output of Channel B; independent load driving capability with same specs as OUT A. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables direct interface with 0–3.3 V ADCs/DACs and single-supply sensors without external level shifters or bias networks. |
| 55 MHz bandwidth at 650 μA/channel | Delivers video-rate and ultrasonic signal fidelity while consuming less than half the quiescent power of legacy 50 MHz op-amps. |
| 17 nV/√Hz input voltage noise | Minimizes added noise in low-amplitude transducer and current-sense applications where signal integrity is critical. |
| 47 dB cross-talk rejection (5 MHz) | Preserves signal integrity in dual-channel active filters or differential driver topologies without physical channel separation. |
| Guaranteed operation from −40°C to +85°C | Supports deployment in industrial automation, automotive cabin electronics, and outdoor portable test equipment. |
Applications
| Active Filters | High-Speed Portable Devices |
|---|---|
Use Scenario: Second-order Sallen-Key low-pass filter in handheld medical ultrasound front-end. IC Role / Device Role / Timing Role: Dual-channel op-amp implementing simultaneous anti-aliasing and gain stages with matched AC response. Use Value: 55 MHz bandwidth and 22 V/μs slew rate preserve transient fidelity of 5 MHz echo signals; rail-to-rail I/O maximizes SNR with 3.3 V ADC. | Use Scenario: Signal conditioning for MEMS accelerometer in battery-powered IoT node. IC Role / Device Role / Timing Role: Low-noise, low-power dual amplifier buffering and scaling sensor output prior to ADC sampling. Use Value: 17 nV/√Hz noise floor and 650 μA/channel supply current extend battery life while maintaining resolution on sub-mV signals. |
| Current Sense Buffer | High-Speed Transducer Amp |
Use Scenario: Bidirectional shunt-based current monitoring in compact DC-DC converter module. IC Role / Device Role / Timing Role: Precision dual op-amp configured as difference amplifier and output buffer for isolated current measurement. Use Value: Input common-mode range extending 0.3 V beyond rails allows direct sensing across 0–5 V bus; ±20 mA drive supports long traces to isolated ADC. | Use Scenario: Amplifying piezoelectric vibration sensor output in predictive maintenance edge device. IC Role / Device Role / Timing Role: High-bandwidth, low-noise amplifier conditioning wideband mechanical resonance signals (100 kHz–2 MHz). Use Value: 55 MHz bandwidth captures harmonics above 1 MHz; 47 dB cross-talk rejection prevents coupling between dual-axis sensor channels. |
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 |
|---|---|---|---|
| LMH6644MMX | Quad-channel version in same VSSOP-16 package; 55 MHz BW, 22 V/μs, but 2.6 mA total supply current (650 μA/channel). | Requires four independent amplifiers; not suitable when only two channels needed and board area is constrained. | Select LMH6644MMX only when quad integration reduces component count and layout complexity outweighs higher total current draw. |
| OPA2350UA | 22 MHz bandwidth, 11 V/μs slew rate, 1.8 mA/ch supply current; lower noise (7 nV/√Hz) but significantly reduced speed and drive capability. | Better for low-noise DC-coupled precision applications; insufficient for >10 MHz signal paths or ±20 mA loads. | Choose OPA2350UA only when bandwidth and output current requirements are relaxed and ultra-low noise dominates design priority. |
Compared with LMH6644MMX and OPA2350UA, the LMH6646MMX uniquely balances 55 MHz bandwidth, 22 V/μs slew rate, ±20 mA drive, and 650 μA/channel quiescent current in a space-efficient VSSOP-8 - making it optimal for dual-channel, battery-powered, high-fidelity analog signal chains where speed, power, and size are co-constrained.
Availability
LMH6646MMX is available at Aetrix Electronics and suitable for active filters, high-speed portable devices, current sense buffers, and high-speed transducer amplifiers requiring stable component supply, full traceability, and long-term industrial lifecycle support.
Supply support for LMH6646MMX 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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.
The LMH6646MMX belongs to TI's LMH664x family of rail-to-rail I/O amplifiers engineered for low-voltage, high-speed signal conditioning in portable and space-constrained systems - emphasizing bandwidth efficiency, power optimization, and robust operation across industrial temperatures.
FAQ
What is the maximum operating supply voltage for the LMH6646MMX?
The LMH6646MMX supports a supply voltage range of 2.5 V to 12 V (V+ − V−), with absolute maximum rating of 12.6 V. Operation at 12 V is fully characterized and supported across −40°C to +85°C, delivering 55 MHz bandwidth and 22 V/μs slew rate - enabling use in both low-voltage portable and higher-voltage industrial signal chains without derating.
Does the LMH6646MMX have shutdown functionality?
No, the LMH6646MMX does not include a shutdown pin. Shutdown capability is exclusive to the LMH6647 (single-channel) variant in the same family. The LMH6646MMX is a dual-channel amplifier with fixed operation - all pins are signal or supply terminals; Pin 4 is V−, Pin 5 is V+, and no SD or enable pin exists in the VSSOP-8 configuration of LMH6646MMX.
What is the typical input offset voltage of the LMH6646MMX over temperature?
The LMH6646MMX 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 industrial temperature range. Its average offset drift is ±5 μV/°C, ensuring stable DC accuracy in precision sensor interfaces and closed-loop systems where offset-induced errors must remain below 100 μV across operating conditions.
Can the LMH6646MMX drive a 50 Ω load directly?
The LMH6646MMX is not designed for continuous 50 Ω termination. Its specified output current is ±20 mA into loads where output voltage remains within 0.5 V of either rail. Driving 50 Ω at ±2.5 V would require ±50 mA - exceeding its safe operating capability. For 50 Ω line driving, use an external buffer stage or select a purpose-built line driver; LMH6646MMX is optimized for 1 kΩ+ loads in active filter and sensor interface roles.
Is the LMH6646MMX pin-compatible with other VSSOP-8 op-amps?
The LMH6646MMX follows standard VSSOP-8 pinout conventions for dual op-amps (OUT A, −IN A, +IN A, V−, V+, −IN B, +IN B, OUT B), matching industry-standard footprints including TI's OPA2350 and ADI's ADA4891-2. However, electrical behavior - especially rail-to-rail input range, 55 MHz bandwidth, and 650 μA supply current - is unique to the LMH664x family and not functionally interchangeable without circuit validation.
LMH6646MMX 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
LMH6646MMX FAQ
1.How can I place an order for LMH6646MMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6646MMX 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 LMH6646MMX reliable?
The price and inventory of LMH6646MMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6646MMX is usually 5 days.
3.What payment methods are accepted for LMH6646MMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6646MMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6646MMX?
LMH6646MMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6646MMX 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 LMH6646MMX?
For technical support, including LMH6646MMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6646MMX requirements.
6.How does Aetrix verify that LMH6646MMX is sourced from the original manufacturer or authorized distributors?
All LMH6646MMX 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 LMH6646MMX meets industry standards.
7.What is the process for return or replacement of LMH6646MMX?
All LMH6646MMX units undergo pre-shipment inspection (PSI). If there is an issue with LMH6646MMX, 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 LMH6646MMX part is unused and in its original packaging.
Return procedure for LMH6646MMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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