My Inquiry
My Account
Texas Instruments LMH6646MM-TI
- Part No.:
- LMH6646MM-TI
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6646MM-TI.pdf
- Description:
- IC OPAMP VFB 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,164
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMH6646MM-TI from Texas Instruments is a dual, rail-to-rail input and output voltage feedback operational amplifier optimized for low-voltage, high-speed applications. It delivers 55MHz −3dB bandwidth, 22V/µs slew rate, and 650µA per channel supply current at 2.7V, with input common-mode range extending 0.3V beyond rails and output swing within 20mV of either supply - enabling full dynamic range in portable instrumentation and sensor interfaces.
For engineers reviewing the LMH6646MM-TI datasheet, LMH6646MM-TI pinout, LMH6646MM-TI application, or LMH6646MM-TI equivalent, key selection criteria include its dual-channel RRIO architecture, MSOP-8 package footprint, 47dB crosstalk rejection at 5MHz, ±20mA linear output drive, and guaranteed operation from −40°C to +85°C across 2.5V–12V supplies.
Technical Context
The LMH6646MM-TI employs National Semiconductor's VIP10 dielectrically isolated bipolar process, supporting stable high-speed performance across 2.5V–12V supply range without significant variation in bandwidth, slew rate, or output current. Its complementary NPN/PNP input stage enables rail-to-rail input operation with 0.3V beyond-rail common-mode range and low input bias current (±2.2µA max).
Output uses a Class A-B "turn-around" stage driving a common-emitter push-pull output capable of ±20mA into loads while maintaining 20mV rail-to-rail swing at light loads. Crosstalk rejection of 47dB (f = 5MHz) confirms isolation between channels in the dual configuration - critical for multiplexed or differential-signal routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3dB Bandwidth | 55MHz at AV = +1 - supports high-frequency active filters and video signal conditioning up to ~30MHz closed-loop. |
| Slew Rate | 22V/µs - enables clean 10MHz full-power sine wave output at 2VPP without distortion. |
| Supply Current | 650µA per channel at 2.7V - allows dual op-amp operation in battery-powered systems with sub-1.3mA total quiescent draw. |
| Input CMVR | Extends 0.3V beyond rails - permits direct interfacing to 0–2.7V sensors or DACs without level-shifting circuitry. |
| Output Swing | Within 20mV of V+ and V− - preserves >98% of 2.7V supply headroom for maximum ADC input utilization. |
| Crosstalk Rejection | 47dB at 5MHz - ensures minimal inter-channel coupling in dual-path signal chains like stereo audio or dual-sensor readouts. |
| Input Voltage Noise | 17nV/√Hz at 100kHz - suitable for precision transducer amplification where noise dominates SNR below 1MHz. |
Pinout & Package
LMH6646MM-TI is housed in an 8-pin MSOP package (NSC drawing MUA08A), 3.0mm × 3.0mm × 1.0mm body size, with exposed thermal pad (not electrically connected). Pin pitch is 0.65mm; recommended PCB land pattern follows TI MSOP-8 thermal guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Channel A output | High-drive, rail-to-rail output node capable of ±20mA; requires local 0.1µF bypass capacitor near V−. |
| 2 (−INA) | Channel A inverting input | High-impedance node sensitive to layout parasitics; keep trace short and away from noisy signals. |
| 3 (+INA) | Channel A non-inverting input | Matches −INA in impedance; common-mode range extends −0.3V to V+ +0.3V. |
| 4 (V−) | Negative supply / ground | Reference for both channels; connect directly to low-impedance ground plane with multiple vias. |
| 5 (+INB) | Channel B non-inverting input | Electrically identical to +INA; independent input path with same CMVR and bias specs. |
| 6 (−INB) | Channel B inverting input | Independent of Channel A; crosstalk rejection of 47dB prevents signal bleed at 5MHz. |
| 7 (OUTB) | Channel B output | Matched performance to OUTA; no internal shutdown control - only LMH6647 includes SD pin. |
| 8 (V+) | Positive supply | Accepts 2.5V–12V; bypass with 0.1µF ceramic + 1µF tantalum for high-frequency stability. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables direct interface with 0–2.7V single-supply systems (e.g., Li-ion powered sensors), eliminating level-shifters and saving board space. |
| 55MHz bandwidth at 2.7V | Maintains high-speed response even at minimum operating voltage - critical for portable oscilloscope front-ends and ultrasound receivers. |
| 650µA per channel supply current | Supports always-on dual-channel amplification in energy-constrained devices (e.g., wearable ECG monitors) with <1.3mA total IQ. |
| 47dB crosstalk rejection | Ensures signal integrity in dual-path configurations such as I/Q demodulators or stereo line drivers without guard traces or shielding. |
| 20mV output swing from rails | Maximizes usable dynamic range for 12-bit+ ADCs operating on 2.7V supplies - improves effective resolution by ≥0.5 LSB. |
Applications
| Active Filter Design | Portable Sensor Interface |
|---|---|
Use Scenario: Second-order Sallen-Key low-pass filter for anti-aliasing before a 1MSPS SAR ADC in handheld test equipment. IC Role / Device Role / Timing Role: Dual op-amp implements unity-gain buffer and filter integrator; RRIO operation preserves full 0–2.5V input range. Use Value: 55MHz GBW ensures phase margin >60° at 100kHz cutoff; 22V/µs slew rate prevents step-response overshoot on fast transients. | Use Scenario: Dual-channel bridge sensor amplifier in battery-powered structural health monitoring node. IC Role / Device Role / Timing Role: One channel conditions strain gauge output; second buffers reference voltage for ratiometric ADC measurement. Use Value: Input CMVR beyond rails accepts unbalanced bridge outputs down to −0.2V; 650µA/channel minimizes battery drain during continuous sensing. |
| High-Speed Transducer Amp | Current Sense Buffer |
Use Scenario: Piezoelectric vibration sensor signal conditioning in predictive maintenance edge device. IC Role / Device Role / Timing Role: AC-coupled gain stage with high-Z input and rail-to-rail output driving 50Ω coaxial cable. Use Value: 17nV/√Hz input voltage noise maintains SNR >70dB up to 100kHz; 20mA output drive sustains signal integrity over 1m cable run. | Use Scenario: Bidirectional current sense amplifier for motor phase current monitoring in 3-phase BLDC inverter. IC Role / Device Role / Timing Role: Configured as difference amplifier with matched external resistors to measure mV-level shunt voltage. Use Value: Input offset voltage ≤±3mV (typ) ensures <0.5% gain error at 100mV full-scale; rail-to-rail output swings 0–3.3V into MCU ADC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual rail-to-rail input/output operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2782IDR | Lower bandwidth (2.5MHz), higher supply current (1.2mA/ch), but lower input offset (0.5mV typ) and rail-to-rail output only. | Better DC precision; unsuitable for >1MHz signal paths or low-power portable use. | Select TLV2782IDR when ultra-low offset dominates over speed and power; avoid for active filtering or fast transient capture. |
| OPA2350UA | Higher bandwidth (38MHz), higher slew rate (22V/µs), but no beyond-rail input (CMVR = V− to V+), and larger SO-8 package. | Compatible for many high-speed analog front-ends but requires input biasing for signals near rails. | Choose OPA2350UA when board space allows SO-8 and input signals stay within supply rails; verify CMVR constraints in sensor interface. |
Compared with TLV2782IDR and OPA2350UA, LMH6646MM-TI uniquely combines 55MHz bandwidth, beyond-rail input capability, and 650µA/ch quiescent current in MSOP-8 - making it optimal for compact, battery-powered, wide-dynamic-range signal chains where both speed and supply efficiency are critical.
Availability
LMH6646MM-TI is available at Aetrix Electronics and suitable for portable instrumentation, sensor signal conditioning, and active filter design requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for LMH6646MM-TI 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 acquired National Semiconductor in 2011 and maintains full technical and manufacturing continuity for legacy high-performance analog products.
The LMH6646MM-TI belongs to the LMH664x family of rail-to-rail I/O amplifiers designed specifically for low-voltage, high-speed signal acquisition in portable and space-constrained systems - emphasizing bandwidth efficiency, supply flexibility, and precision at micro-power levels.
FAQ
What is the maximum supply voltage rating for LMH6646MM-TI?
The absolute maximum supply voltage (V+ − V−) for LMH6646MM-TI is 12.6V, with recommended operating range from 2.5V to 12V. At 12V operation, supply current rises to 1.6mA per channel (max), and output swing remains within 20mV of rails under light load. Exceeding 12.6V risks permanent damage per Absolute Maximum Ratings table.
Does LMH6646MM-TI have a shutdown pin?
No, LMH6646MM-TI does not include a shutdown pin. Shutdown functionality is exclusive to the LMH6647 variant (single-channel with SD pin). The LMH6646MM-TI is a dual-channel amplifier with fixed operation - all pins are signal or supply terminals; no control logic or enable/disable capability is integrated.
What is the input common-mode voltage range of LMH6646MM-TI at 2.7V supply?
At 2.7V single supply (V− = 0V, V+ = 2.7V), the input common-mode voltage range of LMH6646MM-TI extends from −0.3V to +3.0V - exceeding both rails by 0.3V. This is confirmed in the 2.7V Electrical Characteristics table under CMVR (min −0.3V, max 3.0V) and enables direct connection to sensors or DACs outputting slightly negative or overvoltage signals.
Can LMH6646MM-TI drive a 50Ω load effectively?
LMH6646MM-TI can drive 50Ω loads only at reduced output swing and increased distortion. Its specified ±20mA linear output current corresponds to 1V drop across 50Ω - meaning full rail-to-rail swing (2.7V) is unattainable into 50Ω. For 50Ω transmission lines, use a series 45Ω resistor to isolate the op-amp and maintain stability; output swing will be limited to ~1.35VPP at 2.7V supply.
Is LMH6646MM-TI suitable for driving ADC inputs in 12-bit systems?
Yes, LMH6646MM-TI is well-suited for driving 12-bit SAR or sigma-delta ADC inputs. Its 20mV rail-to-rail output swing delivers >99% of 2.7V full-scale range, and typical input offset voltage (±1mV) contributes <0.4 LSB error at 12-bit resolution. Combined with 17nV/√Hz noise, it preserves ENOB >11.5 bits up to 100kHz - verified in Typical Performance Characteristics plots.
LMH6646MM-TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- 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-TI FAQ
1.How can I place an order for LMH6646MM-TI through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6646MM-TI 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-TI reliable?
The price and inventory of LMH6646MM-TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6646MM-TI is usually 5 days.
3.What payment methods are accepted for LMH6646MM-TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6646MM-TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6646MM-TI?
LMH6646MM-TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6646MM-TI 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-TI?
For technical support, including LMH6646MM-TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6646MM-TI requirements.
6.How does Aetrix verify that LMH6646MM-TI is sourced from the original manufacturer or authorized distributors?
All LMH6646MM-TI 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-TI meets industry standards.
7.What is the process for return or replacement of LMH6646MM-TI?
All LMH6646MM-TI units undergo pre-shipment inspection (PSI). If there is an issue with LMH6646MM-TI, 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-TI part is unused and in its original packaging.
Return procedure for LMH6646MM-TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMH6646MM-TI Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
