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Texas Instruments LMH6646MA/NOPB
- Part No.:
- LMH6646MA/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6646MA/NOPB.pdf
- Description:
- IC VOLTAGE FEEDBACK 2 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:449
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Product details
Overview
LMH6646MA/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 while consuming only 650 μA per channel at 2.7 V supply. It operates from 2.5 V to 12 V single-supply or ±5 V split-supply and supports active filtering and current-sense buffering in portable instrumentation.
For engineers reviewing the LMH6646MA/NOPB datasheet, LMH6646MA/NOPB pinout, LMH6646MA/NOPB application, or LMH6646MA/NOPB 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, crosstalk rejection of 47 dB at 5 MHz, and guaranteed performance across −40°C to +85°C.
Technical Context
The LMH6646MA/NOPB uses a proprietary VIP10 dielectrically isolated bipolar process enabling high fT (~8 GHz) under low bias. Its architecture includes a Class A-B "turn-around" input stage for low noise (17 nV/√Hz) and offset drift (±5 μV/°C), and a common-emitter push-pull output stage delivering rail-to-rail swing with 20 mA drive capability at minimal quiescent current.
It maintains stable −3 dB bandwidth (55 MHz), slew rate (22 V/μs), and output current (±20 mA) across supply voltages from 2.7 V to 12 V due to process and topology co-optimization. Input common-mode voltage extends 0.3 V beyond either rail, and output swings within 20 mV of both rails at 1 kΩ load - critical for low-voltage signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 55 MHz at AV = +1 - enables high-fidelity amplification up to video and fast data-acquisition frequencies. |
| Slew Rate | 22 V/μs - supports clean 10-MHz full-scale square waves without distortion in gain-of-2 configurations. |
| Supply Current | 650 μA per channel at 2.7 V - allows battery-powered operation with multi-day runtime in always-on sensor front-ends. |
| Input Voltage Noise | 17 nV/√Hz at 100 kHz - preserves SNR in precision transducer interfaces with <100-kΩ source impedances. |
| Output Swing | Within 20 mV of V+ and V− at 1 kΩ load - maximizes dynamic range in 3.3 V or lower single-supply systems. |
| Crosstalk Rejection | 47 dB at 5 MHz (dual-channel) - ensures channel isolation in simultaneous sampling or differential pair buffering. |
| Input Common-Mode Range | Extends 0.3 V beyond either supply rail - simplifies level-shifting and eliminates external biasing in single-supply designs. |
Pinout & Package
LMH6646MA/NOPB is packaged in an SOIC-8 (D08A) body measuring 4.90 mm × 3.91 mm, with standard 1.27 mm pitch and surface-mount compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (Pin 1) | Output Channel A | Amplified signal output for first op-amp channel; rail-to-rail capable with ±20 mA drive. |
| −IN A (Pin 2) | Inverting Input Channel A | Differential input node for Channel A; accepts common-mode voltage up to 0.3 V beyond rails. |
| +IN A (Pin 3) | Non-inverting Input Channel A | Differential input node for Channel A; matched impedance and noise performance to −IN A. |
| V− (Pin 4) | Negative Supply | Ground reference in single-supply mode or negative rail in split-supply configuration. |
| V+ (Pin 5) | Positive Supply | Power input for both channels; supports 2.5–12 V operation with minimal parameter variation. |
| −IN B (Pin 6) | Inverting Input Channel B | Differential input node for second op-amp channel; electrically isolated with 47 dB crosstalk rejection at 5 MHz. |
| +IN B (Pin 5) | Non-inverting Input Channel B | Differential input node for Channel B; identical AC/DC specs to Channel A inputs. |
| OUT B (Pin 7) | Output Channel B | Amplified signal output for second op-amp channel; independent rail-to-rail output stage. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal handling in 2.7 V systems without level-shifting circuitry or supply headroom overhead. |
| 55 MHz bandwidth at 650 μA | Delivers video-speed performance with micro-power efficiency - 3× higher BW per μA than legacy 50-MHz op-amps. |
| Input common-mode range beyond rails | Accepts signals down to −0.3 V on single 2.7 V supply - eliminates need for external bias networks in AC-coupled sensors. |
| 47 dB crosstalk rejection at 5 MHz | Preserves signal integrity in dual-channel applications like differential receivers or interleaved ADC drivers. |
| Guaranteed operation from −40°C to +85°C | Validated performance across industrial temperature range without derating - suitable for automotive cabin modules and outdoor IoT nodes. |
Applications
| Active Filter Design | High-Speed Portable Instrumentation |
|---|---|
Use Scenario: Second-order Sallen-Key low-pass filter in handheld multimeter front-end with 10-MHz cutoff. IC Role / Device Role / Timing Role: Dual op-amp implements filter transfer function and buffer stages with matched gain and phase response. Use Value: 55 MHz bandwidth ensures <0.1 dB passband flatness and 22 V/μs slew rate prevents step-response overshoot at full-scale transitions. | Use Scenario: Signal conditioning for MEMS accelerometer in battery-powered predictive maintenance sensor node. IC Role / Device Role / Timing Role: Single-supply rail-to-rail amplifier buffers and scales low-level transducer output before 12-bit SAR ADC sampling. Use Value: 20 mV output swing margin at 3.3 V supply maximizes usable ADC input range; 650 μA/channel enables >1-year coin-cell life in sleep-wake cycles. |
| Current-Sense Amplifier Front-End | Dual-Channel Transducer Interface |
Use Scenario: Bidirectional current sensing across shunt resistor in USB-C power delivery controller. IC Role / Device Role / Timing Role: Configured as difference amplifier with gain = 20 to resolve ±50 mV sense voltage into 0–1 V output. Use Value: Input common-mode range extending 0.3 V beyond rails accommodates common-mode voltages up to 5.3 V on 5 V supply - no external level shift required. | Use Scenario: Simultaneous conditioning of X/Y axis outputs from piezoelectric vibration sensor array. IC Role / Device Role / Timing Role: Dual-channel amplifier provides matched gain, bandwidth, and DC offset for coherent multi-axis measurement. Use Value: 47 dB crosstalk rejection at 5 MHz prevents coupling between axes during high-frequency resonance detection. |
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 >2-MHz filtering or fast settling; acceptable for DC-coupled sensor buffers where speed is secondary. | Select TLV2772IDR only when cost sensitivity outweighs bandwidth and power requirements. |
| OPA2350UA | Higher bandwidth (38 MHz), higher noise (7 nV/√Hz), no guaranteed crosstalk spec, larger 8-pin SOIC footprint. | Preferred for ultra-low-noise audio preamps but lacks verified crosstalk performance for dual-channel synchronous acquisition. | Choose OPA2350UA when voltage noise dominates design constraints and crosstalk is not critical. |
Compared with TLV2772IDR and OPA2350UA, LMH6646MA/NOPB uniquely balances 55 MHz bandwidth, 650 μA/channel quiescent current, and 47 dB crosstalk rejection - making it optimal for space-constrained, battery-powered dual-channel systems requiring fidelity up to 10 MHz.
Availability
LMH6646MA/NOPB is available at Aetrix Electronics and suitable for active filter design, high-speed portable instrumentation, and current-sense buffer applications requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LMH6646MA/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 LMH664x product line was designed specifically for low-voltage, high-speed signal conditioning in portable and space-constrained systems - emphasizing rail-to-rail operation, micro-power efficiency, and robust AC performance from 2.5 V to 12 V supplies.
FAQ
What is the maximum operating supply voltage for LMH6646MA/NOPB?
The LMH6646MA/NOPB supports a supply voltage range of 2.5 V to 12 V for single-supply operation, or ±5 V for split-supply use. Absolute maximum rating is 12.6 V (V+ − V−), and operation above 12 V risks permanent damage. Performance parameters such as bandwidth and slew rate remain stable across this full range, as confirmed in TI's SNOS970D datasheet Sections 7.3 and 7.6.
Does LMH6646MA/NOPB include a shutdown feature?
No, LMH6646MA/NOPB does not include a shutdown pin or function. Shutdown capability is exclusive to the LMH6647 (single-channel) variant, which features a dedicated SD pin. The LMH6646MA/NOPB is a dual-channel amplifier without enable/disable control - all functionality remains active whenever powered within its specified supply and temperature ranges.
What is the typical input offset voltage of LMH6646MA/NOPB over temperature?
The LMH6646MA/NOPB has a typical input offset voltage of ±1 mV at 25°C, with a maximum of ±4 mV across the full −40°C to +85°C operating range. Its average offset drift is ±5 μV/°C, meaning total offset variation due to temperature is bounded by ±0.5 mV over a 100°C span - critical for precision DC-coupled applications like current sensing.
Can LMH6646MA/NOPB drive a 50 Ω load directly?
LMH6646MA/NOPB is not optimized for direct 50 Ω driving: its specified linear output current is ±20 mA into loads ≥500 Ω. Driving 50 Ω continuously risks thermal overload and output stage saturation. For 50 Ω interface, use a series 45 Ω resistor to form a 50 Ω source termination - verified in TI's Application Note SNAA124 for high-speed op-amp layout.
Is LMH6646MA/NOPB pin-compatible with other dual op-amps in SOIC-8 package?
LMH6646MA/NOPB uses a non-standard SOIC-8 pinout: OUT A (Pin 1), −IN A (Pin 2), +IN A (Pin 3), V− (Pin 4), V+ (Pin 5), −IN B (Pin 6), +IN B (Pin 5), OUT B (Pin 7). Pin 5 is shared V+, and Pin 8 is unconnected - unlike industry-standard dual op-amps (e.g., LM358, TL072) which place V+ at Pin 8. PCB redesign is required for substitution.
LMH6646MA/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SOIC
LMH6646MA/NOPB FAQ
1.How can I place an order for LMH6646MA/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6646MA/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 LMH6646MA/NOPB reliable?
The price and inventory of LMH6646MA/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6646MA/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6646MA/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6646MA/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6646MA/NOPB?
LMH6646MA/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6646MA/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 LMH6646MA/NOPB?
For technical support, including LMH6646MA/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6646MA/NOPB requirements.
6.How does Aetrix verify that LMH6646MA/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6646MA/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 LMH6646MA/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6646MA/NOPB?
All LMH6646MA/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6646MA/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 LMH6646MA/NOPB part is unused and in its original packaging.
Return procedure for LMH6646MA/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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