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Texas Instruments LMH6643QMM/NOPB
- Part No.:
- LMH6643QMM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6643QMM/NOPB.pdf
- Description:
- IC OPAMP VFB 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,243
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Product details
Overview
LMH6643QMM/NOPB from Texas Instruments is a dual, rail-to-rail output, voltage-feedback operational amplifier optimized for low-power, high-speed applications. It delivers 130 MHz −3 dB bandwidth (±5 V), 135 V/µs slew rate, ±75 mA linear output current, and 40 mV from rails output swing - enabling precision buffering in ADC front-ends, video signal chains, and automotive sensor interfaces.
For engineers reviewing the LMH6643QMM/NOPB datasheet, LMH6643QMM/NOPB pinout, LMH6643QMM/NOPB application, or LMH6643QMM/NOPB equivalent, key selection criteria include its AEC-Q100 Grade 3 qualification, dual-channel VSSOP-8 packaging, 2.7–10 V supply flexibility, −62 dBc THD at 5 MHz, and guaranteed operation from −40°C to +85°C in safety-critical automotive systems.
Technical Context
The LMH6643QMM/NOPB employs a voltage-feedback architecture with fully differential input stage and Class AB output stage, supporting stable closed-loop gains from AV = +1 to +10 without external compensation. Its input common-mode range extends 0.5 V below V− and 1 V from V+, while output swing reaches within 40 mV of either rail under 2 kΩ load.
Designed for single- or split-supply operation, it features no phase reversal when CMVR is exceeded, infinite short-circuit duration at VS < 6 V, and robust thermal performance (RθJA = 235°C/W) in the 3.0 mm × 3.0 mm VSSOP package - making it suitable for space-constrained, thermally demanding automotive ECUs and portable instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 130 MHz at ±5 V, AV = +1 - supports wideband signal conditioning up to UHF frequencies in video and comms. |
| Slew Rate | 135 V/µs (±5 V, AV = −1) - preserves fast transient fidelity in pulse amplification and DAC output stages. |
| Output Current | ±75 mA linear drive - directly drives 150 Ω video loads or multiple SAR ADC inputs without external buffers. |
| Supply Range | 2.7 V to 10 V single or ±5 V split - enables interoperability across 3.3 V microcontrollers, 5 V legacy systems, and automotive 12 V-derived rails. |
| THD @ 5 MHz | −62 dBc (RL = 2 kΩ, VO = 2 VPP, AV = +2) - meets broadcast-grade video distortion requirements (DG/DP ≤ 0.01%). |
| Input Voltage Noise | 17 nV/√Hz at 100 kHz - maintains SNR integrity in low-level sensor signal amplification paths. |
| Operating Temp | −40°C to +85°C - qualified per AEC-Q100 Grade 3 for under-hood and cabin electronics. |
Pinout & Package
VSSOP-8 (DGK0008A) package: 3.00 mm × 3.00 mm body, 0.65 mm pitch, exposed thermal pad (not electrically connected). RoHS-compliant, lead-free (NOPB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (Pin 1) | Channel A Output | Rail-to-rail sourcing/sinking node capable of ±75 mA into 2 kΩ; 40 mV from rails swing ensures full dynamic range utilization. |
| −IN A (Pin 2) | Channel A Inverting Input | Differential input terminal with 3 MΩ common-mode resistance and 2 pF capacitance - sets gain with feedback network. |
| +IN A (Pin 3) | Channel A Non-inverting Input | High-impedance input accepting CMVR from −5.5 V to +4.0 V (±5 V supply); enables single-ended or differential configurations. |
| V− (Pin 4) | Negative Supply Rail | Reference for internal biasing; supports ground-referenced or negative-rail operation down to −5 V. |
| V+ (Pin 8) | Positive Supply Rail | Power input up to +10 V or +5 V; PSRR > 78 dB ensures immunity to supply ripple in noisy automotive environments. |
| −IN B (Pin 6) | Channel B Inverting Input | Independent second channel input - enables dual-path signal processing (e.g., I/Q demodulation, stereo audio). |
| +IN B (Pin 5) | Channel B Non-inverting Input | Matches Channel A specs; allows identical configuration for both channels without layout asymmetry. |
| OUT B (Pin 7) | Channel B Output | Functionally identical to OUT A; crosstalk rejection > 47 dB at 5 MHz prevents inter-channel interference. |
Key Features
| Feature | Design Value |
|---|---|
| No output phase reversal | Guaranteed stability even when input exceeds CMVR - eliminates latch-up risk in overvoltage transients. |
| Output short-circuit protection | Infinite duration at VS < 6 V; 1.5 ms max at higher voltages - protects against sustained faults without external current limiting. |
| 0.1 dB gain flatness | 12 MHz at AV = +2, RL = 150 Ω - preserves amplitude accuracy across NTSC/PAL video bandwidths. |
| Low power consumption | 2.7 mA per channel at no load - reduces thermal load and extends battery life in portable diagnostics tools. |
| Automotive qualification | AEC-Q100 Grade 3 (−40°C to +85°C), manufactured on automotive-grade flow - meets OEM reliability requirements. |
Applications
| ADC Front-End Buffer | Automotive Camera Signal Chain |
|---|---|
Use Scenario: Driving SAR or sigma-delta ADC inputs with fast settling and minimal distortion. IC Role / Device Role / Timing Role: High-speed, low-noise buffer isolating sensitive ADC inputs from source impedance and PCB trace effects. Use Value: 68 ns ±0.1% settling time and −62 dBc THD ensure accurate digitization of 10+ bit signals at multi-MSPS rates. |
Use Scenario: Amplifying analog video outputs from CMOS image sensors in rear-view or surround-view cameras. IC Role / Device Role / Timing Role: Dual-channel video driver delivering NTSC/PAL-compliant differential gain (0.01%) and phase (0.01°). Use Value: Rail-to-rail output swing and 150 Ω drive capability maintain signal integrity across long coaxial cables to display processors. |
| Current Sense Amplifier | Portable Medical Instrumentation |
Use Scenario: Amplifying mV-level shunt voltage drops in motor control or battery management systems. IC Role / Device Role / Timing Role: Precision, high-bandwidth current sense buffer with wide input common-mode range (−5.5 V to +4.0 V). Use Value: Input offset voltage ≤ ±7 mV and TC VOS ≤ ±5 µV/°C minimize temperature-induced measurement drift. |
Use Scenario: Signal conditioning in handheld ECG or pulse oximetry devices requiring low power and high fidelity. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail op-amp powering analog front-end filters and gain stages. Use Value: 17 nV/√Hz input voltage noise and 2.7 mA supply current enable high-SNR acquisition with extended battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6643MME/NOPB | Same silicon, but in 8-pin SOIC (D) package (4.9 mm × 6.0 mm) - larger footprint, higher RθJA (130°C/W). | Preferred where board space permits and manual soldering or legacy footprint compatibility is required. | Select LMH6643MME/NOPB only if VSSOP assembly is unavailable or thermal margin is sufficient with added heatsinking. |
| OPA2350UA/2K5 | Lower bandwidth (38 MHz), lower output current (±40 mA), but lower input bias current (0.2 pA) and rail-to-rail input. | Better suited for high-impedance sensor interfaces (e.g., pH electrodes), not video or high-current buffering. | Choose OPA2350UA/2K5 only when ultra-low input bias and rail-to-rail input are mandatory, and speed/current demands are relaxed. |
Compared with LMH6643MME/NOPB, LMH6643QMM/NOPB offers 40% smaller area and superior thermal performance for dense automotive modules; versus OPA2350UA/2K5, it provides >3× bandwidth and >1.8× output drive - critical for video and fast-settling data acquisition.
Availability
LMH6643QMM/NOPB is available at Aetrix Electronics and suitable for automotive camera modules, industrial ADC signal chains, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMH6643QMM/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 leader specializing in analog and embedded processing technologies, with decades of automotive-grade product development and manufacturing expertise.
The LMH6643QMM/NOPB belongs to TI's LMH664X family of low-power, high-speed op-amps designed specifically for automotive vision systems, industrial data acquisition, and portable instrumentation demanding rail-to-rail output and AEC-Q100 compliance.
FAQ
What is the maximum supply voltage for LMH6643QMM/NOPB?
The absolute maximum supply voltage (V+ − V−) for LMH6643QMM/NOPB is 13.5 V. However, the recommended operating range is 2.7 V to 10 V for reliable performance. Operation above 10 V risks exceeding junction temperature limits or violating electrical specifications - always refer to Section 7.1 Absolute Maximum Ratings in the official datasheet for derating guidance.
Does LMH6643QMM/NOPB support single-supply operation?
Yes, LMH6643QMM/NOPB supports true single-supply operation from 2.7 V to 10 V. Its input common-mode voltage range extends to 0.5 V below V− (i.e., to ground in single-supply mode) and 1 V from V+, while output swings within 40 mV of both rails - enabling full-scale signal handling in 3.3 V or 5 V systems without level-shifting circuitry.
Is LMH6643QMM/NOPB pin-compatible with LMH6642QMM/NOPB?
No, LMH6643QMM/NOPB is not pin-compatible with LMH6642QMM/NOPB. The LMH6642 is a single-channel device in SOT-23-5 (DBV) package, whereas LMH6643QMM/NOPB is dual-channel in VSSOP-8 (DGK) package. Pin count, layout, and channel count differ fundamentally - PCB redesign is required for substitution.
What is the thermal resistance (RθJA) of LMH6643QMM/NOPB?
The junction-to-ambient thermal resistance (RθJA) of LMH6643QMM/NOPB in the VSSOP-8 package is 235°C/W, measured on a standard JEDEC 2-layer board. This value assumes no thermal vias or copper pour; adding thermal relief or stitching vias beneath the exposed pad can reduce effective RθJA by 20–40%, improving power dissipation margin in automotive applications.
How does LMH6643QMM/NOPB handle overdrive recovery?
LMH6643QMM/NOPB exhibits 100 ns overdrive recovery time - the duration required to return to linear operation after the input differential voltage exceeds the specified common-mode range. This fast recovery minimizes signal distortion during large transient events in automotive sensor interfaces and video sync pulses, as verified in TI's SNOSC61C datasheet Figure 21.
LMH6643QMM/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:
- Rail-to-Rail
- Slew Rate:
- 135V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 130 MHz
- Current - Input Bias:
- 1.6 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 2.7mA (x2 Channels)
- Current - Output / Channel:
- 75 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 10 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LMH6643QMM/NOPB FAQ
1.How can I place an order for LMH6643QMM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6643QMM/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 LMH6643QMM/NOPB reliable?
The price and inventory of LMH6643QMM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6643QMM/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6643QMM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6643QMM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6643QMM/NOPB?
LMH6643QMM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6643QMM/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 LMH6643QMM/NOPB?
For technical support, including LMH6643QMM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6643QMM/NOPB requirements.
6.How does Aetrix verify that LMH6643QMM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6643QMM/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 LMH6643QMM/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6643QMM/NOPB?
All LMH6643QMM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6643QMM/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 LMH6643QMM/NOPB part is unused and in its original packaging.
Return procedure for LMH6643QMM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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