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Texas Instruments LMH6643MM
- Part No.:
- LMH6643MM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMH6643MM.pdf
- Description:
- IC OPAMP VFB 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,384
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Product details
Overview
LMH6643MM from Texas Instruments is a dual-channel, rail-to-rail output voltage feedback operational amplifier optimized for low-power, high-speed applications. It delivers 130 MHz −3 dB bandwidth (±5 V), 130 V/µs slew rate, ±75 mA linear output current, and −62 dBc THD at 5 MHz - enabling high-fidelity ADC buffering and active filter design in portable video and current-sense systems.
For engineers reviewing the LMH6643MM datasheet, LMH6643MM pinout, LMH6643MM application, or LMH6643MM equivalent, this page provides verified specifications, package-confirmed pin functions, real-world use cases with design-value context, and two validated alternative parts with documented functional and application-level differences.
Technical Context
The LMH6643MM implements a voltage-feedback architecture with fully differential input stage and Class AB rail-to-rail output stage, supporting stable operation across gain settings (AV = +1 to +10) and supply voltages (2.7 V to 12.8 V). Its 0.1 dB gain flatness extends to 12 MHz under 150 Ω load, and it maintains <2 dB peaking across temperature (−40°C to +85°C) and supply conditions.
Input common-mode range extends 0.5 V beyond V− and 1 V from V+, while output swings within 40 mV of either rail. The device features no phase reversal on CMVR exceedance and includes internal short-circuit protection with infinite duration below 6 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 130 MHz at ±5 V, AV = +1 - supports wideband signal conditioning up to ~100 MHz without gain roll-off |
| Slew Rate | 130 V/µs (AV = −1) - enables full-scale 2 VPP output at ≥20 MHz without slewing distortion |
| Output Current | ±75 mA linear drive - drives 150 Ω video loads or heavy capacitive ADC inputs without clipping |
| THD | −62 dBc at 5 MHz, 2 VPP, RL = 2 kΩ - meets broadcast-grade video (DG/DP ≤ 0.01%) and precision data acquisition requirements |
| Supply Range | 2.7 V to 12.8 V single or split - operates from 3 V battery rails or ±5 V industrial supplies |
| Input Noise | 17 nV/√Hz at 100 kHz - preserves SNR in front-end amplification of low-level sensor signals |
| Settling Time | 68 ns to ±0.1% - ensures accurate sampling in 12–14-bit ADC buffer applications |
Pinout & Package
VSSOP-8 (DGK08A) package: 3.00 mm × 3.00 mm body, 0.65 mm pitch, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Channel A output - rail-to-rail swing (40 mV from rails), capable of ±75 mA sourcing/sinking |
| 2 | −IN A | Channel A inverting input - supports DC-coupled feedback networks; CMVR extends to 0.5 V below V− |
| 3 | +IN A | Channel A non-inverting input - high-impedance (3 MΩ), low bias current (−1.6 µA typ) |
| 4 | V− | Negative supply - accepts ground (single-supply) or negative rail (split-supply); referenced for all internal biasing |
| 5 | V+ | Positive supply - supports up to 12.8 V; PSRR > 78 dB ensures immunity to supply noise |
| 6 | −IN B | Channel B inverting input - electrically isolated from Channel A; identical specs and layout symmetry required |
| 7 | +IN B | Channel B non-inverting input - matched offset drift (±5 µV/°C) enables dual-channel precision instrumentation |
| 8 | OUT B | Channel B output - independent, fully buffered; no crosstalk (CT Rej. = 47 dB at 5 MHz) |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Within 40 mV of V+ and V− - maximizes dynamic range in low-voltage (3 V) systems without level-shifting |
| No output phase reversal | Remains stable even when input exceeds CMVR - eliminates latch-up risk in overdrive or power-up conditions |
| Low distortion at high frequency | −62 dBc THD at 5 MHz - enables clean signal reconstruction in video DAC buffers and IF amplifiers |
| Fast settling & low noise | 68 ns to ±0.1%, 17 nV/√Hz - meets timing and SNR demands of 10+ MSPS SAR and sigma-delta ADCs |
| Robust short-circuit protection | Infinite safe duration below 6 V supply - simplifies system-level fault handling in battery-powered equipment |
Applications
| ADC Buffer Amplifier | Portable Video Driver |
|---|---|
Use Scenario: Driving the input of a 12-bit, 10 MSPS SAR ADC in a handheld medical sensor. IC Role / Device Role / Timing Role: Single-supply (3 V) unity-gain buffer isolating high-impedance sensor from ADC's switched-capacitor input. Use Value: 68 ns settling ensures full accuracy; rail-to-rail output uses full ADC input range; 17 nV/√Hz noise avoids degrading ENOB. |
Use Scenario: Output driver for NTSC/PAL composite video in a portable DVD player. IC Role / Device Role / Timing Role: Dual-channel gain-of-two amplifier driving 75 Ω coaxial cable with sync tip clamping. Use Value: DG/DP ≤ 0.01% preserves color fidelity; ±75 mA drive sustains 1 VPP into 150 Ω load; 130 MHz BW supports >4.2 MHz luminance bandwidth. |
| Current Sense Amplifier | Active Low-Pass Filter |
Use Scenario: Bidirectional shunt-based current monitoring in a 5 V USB-C PD charger. IC Role / Device Role / Timing Role: High-side sensing amplifier with gain-of-20, rejecting common-mode voltage up to 28 V via external resistor network. Use Value: Input CMVR extends to −0.5 V (beyond V−), enabling accurate zero-current detection; 95 dB CMRR rejects supply ripple. |
Use Scenario: 4th-order Butterworth anti-aliasing filter preceding a 20 MSPS ADC in industrial vibration sensing. IC Role / Device Role / Timing Role: Dual op-amp implementing two 2-pole stages in cascade; one LMH6643MM channel per stage. Use Value: 130 MHz GBW and 130 V/µs SR maintain filter Q-factor and phase linearity up to 1 MHz; low THD prevents harmonic folding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, high-speed op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6644MME | Quad-channel version in TSSOP-14; identical AC specs but higher total supply current (4.5 mA vs. 2.7 mA per channel) | Replaces LMH6643MM only when ≥3 channels needed; not drop-in due to pinout and footprint mismatch | Select LMH6644MME only for multi-channel consolidation; avoid for dual-channel space-constrained designs. |
| OPA2355DGKR | Lower bandwidth (200 MHz), lower output current (±45 mA), higher supply current (4.9 mA/ch), no short-circuit protection | Better for ultra-high-speed small-signal apps (e.g., RF IF amps); unsuitable for heavy-load video or current sense | Choose OPA2355DGKR only if bandwidth >130 MHz is mandatory and load current <±50 mA; verify thermal margin without SC protection. |
Compared with LMH6643MM, LMH6644MME offers channel density at cost of layout compatibility and power efficiency, while OPA2355DGKR trades robustness and drive strength for raw speed - making LMH6643MM the optimal balance for general-purpose high-fidelity analog signal conditioning.
Availability
LMH6643MM is available at Aetrix Electronics and suitable for portable video systems, precision ADC buffering, and current-sense instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LMH6643MM 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 delivering analog and embedded processing solutions, with deep expertise in high-performance op-amps and signal chain products.
The LMH664x family was designed specifically for low-voltage, high-fidelity analog signal paths - targeting portable video, ADC/DAC interfaces, and precision instrumentation where rail-to-rail output, low distortion, and robust drive capability are critical.
FAQ
What supply voltage range does the LMH6643MM support?
The LMH6643MM operates from a single supply of 2.7 V to 12.8 V or split supplies up to ±6.4 V. It is fully characterized at 3 V, 5 V, and ±5 V, with guaranteed performance including 130 MHz bandwidth and ±75 mA output drive across this range. At 3 V, its full-power bandwidth remains 40 MHz - sufficient for many portable applications.
Does the LMH6643MM have rail-to-rail input capability?
No - the LMH6643MM features rail-to-rail *output* but not rail-to-rail *input*. Its input common-mode voltage range extends to 0.5 V beyond V− and 1 V from V+, meaning it can accept inputs down to V− − 0.5 V (e.g., −0.5 V on a 0 V/5 V supply) but not all the way to V−. This allows robust operation in single-supply configurations with DC-coupled feedback.
What is the maximum safe continuous output short-circuit duration for the LMH6643MM?
Under supply voltages below 6 V (e.g., 3 V or 5 V), the LMH6643MM supports infinite-duration output short-circuit protection at room temperature. Above 6 V, allowable short-circuit duration is limited to 1.5 ms - a hard limit enforced by internal thermal protection. This behavior is confirmed in TI's SNOS966Q datasheet Section 7.1 and Note 4.
Can the LMH6643MM drive a 150 Ω video load while maintaining NTSC video specifications?
Yes - the LMH6643MM delivers DG ≤ 0.01% and DP ≤ 0.01° into a 150 Ω load at AV = +2, meeting broadcast-grade video standards. Its ±75 mA linear output current ensures stable 1 VPP drive into 75 Ω coax (via series termination), and 0.1 dB gain flatness to 12 MHz preserves luminance fidelity across the NTSC 4.2 MHz bandwidth.
Is the LMH6643MM pin-compatible with other devices in the LMH664x family?
The LMH6643MM (VSSOP-8) shares identical pinout with the LMH6642 (SOT-23-5 omitted) and LMH6644 (TSSOP-14 has different pin count and assignment). Within the dual-channel variant, LMH6643MM is pin-compatible across SOIC-8 and VSSOP-8 packages (DGK08A and D08A), enabling direct footprint substitution between those two封装 options without circuit modification.
LMH6643MM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- 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:
- 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):
- 12.8 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LMH6643MM FAQ
1.How can I place an order for LMH6643MM through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6643MM 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 LMH6643MM reliable?
The price and inventory of LMH6643MM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6643MM is usually 5 days.
3.What payment methods are accepted for LMH6643MM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6643MM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6643MM?
LMH6643MM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6643MM 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 LMH6643MM?
For technical support, including LMH6643MM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6643MM requirements.
6.How does Aetrix verify that LMH6643MM is sourced from the original manufacturer or authorized distributors?
All LMH6643MM 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 LMH6643MM meets industry standards.
7.What is the process for return or replacement of LMH6643MM?
All LMH6643MM units undergo pre-shipment inspection (PSI). If there is an issue with LMH6643MM, 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 LMH6643MM part is unused and in its original packaging.
Return procedure for LMH6643MM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMH6643MM Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
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LM2904DGKR
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LM324DR
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
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LM2902PWR
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LM2902DR
Texas Instruments
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LM358P
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