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Texas Instruments LMH6643MA
- Part No.:
- LMH6643MA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMH6643MA.pdf
- Description:
- IC VOLTAGE FEEDBACK 2 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:290
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Product details
Overview
LMH6643MA 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 LMH6643MA datasheet, LMH6643MA pinout, LMH6643MA application, or LMH6643MA equivalent, key selection criteria include its dual-channel SOIC-8 package, rail-to-rail output swing within 40 mV of supplies, 2.7–12.8 V single-supply operation, and verified performance across 3 V, 5 V, and ±5 V rails with full characterization for industrial temperature range (−40°C to +85°C).
Technical Context
The LMH6643MA employs a voltage-feedback architecture with fully differential input stage and Class AB output stage, supporting stable operation at gains ≥ +1 without external compensation. Its input common-mode range extends 0.5 V beyond V− and 1 V from V+, while output swings to within 40 mV of either rail under 2 kΩ load.
Stability is ensured across supply voltages (2.7–12.8 V) and temperatures (−40°C to +85°C), with 0.1 dB gain flatness up to 12 MHz into 150 Ω at AV = +2 and minimal peaking (≤2 dB). Fast settling time (68 ns, ±0.1%) and overdrive recovery (100 ns) support precision timing-critical signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 130 MHz at ±5 V, AV = +1 - supports wideband signal acquisition up to ~100 MHz without gain roll-off |
| Slew Rate | 130 V/µs (AV = −1) - maintains 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 buffers without clipping |
| Supply Range | 2.7 V to 12.8 V single supply - operates from Li-ion battery (3.0 V) to industrial 12 V rails |
| Input Noise | 17 nV/√Hz @ 100 kHz - preserves SNR in precision sensor front-ends and low-level analog paths |
| THD | −62 dBc @ 5 MHz, 2 VPP, RL = 2 kΩ - meets broadcast-grade video and high-resolution ADC buffer requirements |
| Settling Time | 68 ns to ±0.1% - enables fast multiplexed data acquisition and pulse response fidelity |
Pinout & Package
LMH6643MA is packaged in an 8-pin SOIC (D08A) with body size 4.90 mm × 3.91 mm, rated for surface-mount assembly and industrial thermal performance (RθJA = 190°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Channel A output - rail-to-rail capable, sinks/sourses ±75 mA, swings within 40 mV of V+ or V− |
| 2 | −IN A | Channel A inverting input - supports unity-gain stable configurations; CMVR extends to 0.5 V below V− |
| 3 | +IN A | Channel A non-inverting input - matched impedance to −IN A; enables precision differential sensing |
| 4 | V− | Negative supply terminal - accepts ground (single supply) or negative rail (split supply); referenced for all internal biasing |
| 5 | V+ | Positive supply terminal - supports 2.7–12.8 V operation; PSRR = 79 dB (5 V supply) |
| 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 - independent of Channel A; enables dual-path signal processing without crosstalk |
| 8 | OUT B | Channel B output - fully independent output stage; no phase reversal when CMVR exceeded |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Within 40 mV of V+ or V− at 2 kΩ load - maximizes dynamic range in low-voltage systems (e.g., 3 V ADC interfaces) |
| Input common-mode range | Extends 0.5 V beyond V− and 1 V from V+ - enables direct connection to ground-referenced sensors or DAC outputs |
| No output phase reversal | Guaranteed even when input exceeds CMVR - eliminates latch-up risk in overdriven sensor or fault conditions |
| Output short-circuit protection | Infinite duration at VS < 6 V (room temp); 1.5 ms max at VS > 6 V - protects against sustained faults without external current limiting |
| Low power per channel | 2.7 mA supply current (no load) - enables dual-channel amplification in battery-powered devices with <5.5 mW/channel dissipation |
Applications
| ADC Buffer Amplifier | Portable Video Driver |
|---|---|
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 front-end from source impedance and noise. Use Value: 68 ns settling time and −62 dBc THD ensure accurate digitization of 5+ MHz signals without harmonic aliasing or code errors. | Use Scenario: Output stage for handheld display controllers driving 150 Ω RGB video lines. IC Role / Device Role / Timing Role: Dual-channel video line driver delivering NTSC-compliant differential gain (0.01%) and phase (0.01°). Use Value: Rail-to-rail output swing and 75 mA drive capability maintain full 1 VPP video amplitude into 150 Ω loads across temperature. |
| Current Sense Amplifier | Active Filter Stage |
Use Scenario: Amplifying mV-level shunt voltage in motor control or power supply monitoring. IC Role / Device Role / Timing Role: Precision gain block with low offset (±3.4 mV max) and high CMRR (95 dB) rejecting common-mode noise. Use Value: Input CMVR extending 0.5 V below V− allows direct connection to low-side shunts referenced to ground or negative rails. | Use Scenario: Second-order Sallen-Key or MFB filter stage in anti-aliasing or reconstruction paths. IC Role / Device Role / Timing Role: Unity-gain stable, high-bandwidth op-amp providing precise pole placement and low group delay variation. Use Value: 130 MHz bandwidth and 0.1 dB flatness to 12 MHz ensure filter response matches theoretical transfer function up to 10 MHz. |
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 |
|---|---|---|---|
| LMH6644MDE | Quad-channel version in TSSOP-14; same bandwidth, slew rate, and noise specs; higher total supply current (4 × 2.7 mA) | Replaces two LMH6643MA units in space-constrained quad-signal paths (e.g., multi-channel data acquisition) | Select LMH6644MDE only when four matched channels are required; not pin-compatible with LMH6643MA |
| OPA2355DGKR | Lower bandwidth (200 MHz), higher supply current (6 mA/ch), rail-to-rail I/O, but no guaranteed CMVR extension beyond V− | Better suited for ultra-high-speed, low-distortion applications where input swing to ground is not required | Choose OPA2355DGKR for >150 MHz small-signal BW needs; avoid if input must operate at 0 V in single-supply mode |
Compared with LMH6644MDE, LMH6643MA saves board area and power in dual-channel systems; versus OPA2355DGKR, it provides guaranteed sub-ground input operation critical for current-sense topologies - making LMH6643MA optimal for cost-sensitive, low-voltage, rail-aware designs.
Availability
LMH6643MA is available at Aetrix Electronics and suitable for ADC buffering, portable video interfaces, current-sense amplification, and active filter design requiring stable component supply across industrial temperature grades and long-term production cycles.
Supply support for LMH6643MA 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, embedded processing, and connectivity technologies with decades of op-amp innovation.
The LMH664x family was designed for low-power, high-fidelity signal conditioning in portable, industrial, and video systems - emphasizing rail-to-rail output, wide supply flexibility, and robust stability without external compensation.
FAQ
What supply voltage range does the LMH6643MA support?
The LMH6643MA operates from 2.7 V to 12.8 V single supply or ±1.35 V to ±6.4 V split supply. It is fully characterized at 3 V, 5 V, and ±5 V, with guaranteed performance across −40°C to +85°C. The device maintains 130 MHz bandwidth and 130 V/µs slew rate at ±5 V, and retains usable bandwidth (>80 MHz) even at 3 V - making LMH6643MA suitable for both battery-powered and industrial rail applications.
Does the LMH6643MA have rail-to-rail input capability?
No, the LMH6643MA features rail-to-rail *output* but not rail-to-rail *input*. Its input common-mode voltage range extends 0.5 V beyond V− and 1 V from V+, meaning it accepts inputs down to V− − 0.5 V (e.g., −0.5 V on a 0 V/5 V supply) and up to V+ − 1 V. This enables ground-referenced sensing in single-supply systems, but true 0–V+ input coverage requires external level-shifting or a different amplifier family.
What is the maximum output current capability of the LMH6643MA?
The LMH6643MA delivers ±75 mA linear output current into resistive loads, with short-circuit current ranging from +35 mA to +115 mA (sourcing) and −40 mA to −145 mA (sinking), depending on supply voltage and temperature. At ±5 V, typical short-circuit current is +115 mA / −145 mA. Output current remains linear up to ±75 mA, ensuring distortion-free operation into 150 Ω video loads or 2 kΩ precision buffers - a key specification confirmed in the LMH6643MA datasheet's electrical characteristics tables.
Is the LMH6643MA unity-gain stable?
Yes, the LMH6643MA is unity-gain stable and requires no external compensation. It achieves stable closed-loop operation at gains ≥ +1 across all specified supply voltages (2.7–12.8 V) and temperatures (−40°C to +85°C), with measured 0.1 dB gain flatness up to 12 MHz into 150 Ω at AV = +2 and ≤2 dB peaking. This stability is inherent to its voltage-feedback architecture and internal compensation - verified in TI's SNOS966Q datasheet Figures 1–6 and Section 5 "Description (continued)".
How does the LMH6643MA perform in video applications?
The LMH6643MA delivers professional-grade video performance: 0.01% differential gain (DG) and 0.01° differential phase (DP) at NTSC frequencies with AV = +2 into 150 Ω, verified at 3 V, 5 V, and ±5 V supplies. Its 130 MHz bandwidth, −62 dBc THD at 5 MHz, and rail-to-rail output enable full 1 VPP video swing with minimal color error or timing skew - making LMH6643MA ideal for RGB, YPbPr, and CVBS driver stages in portable displays and set-top boxes.
LMH6643MA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMH®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SOIC
LMH6643MA FAQ
1.How can I place an order for LMH6643MA through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6643MA 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 LMH6643MA reliable?
The price and inventory of LMH6643MA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6643MA is usually 5 days.
3.What payment methods are accepted for LMH6643MA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6643MA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6643MA?
LMH6643MA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6643MA 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 LMH6643MA?
For technical support, including LMH6643MA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6643MA requirements.
6.How does Aetrix verify that LMH6643MA is sourced from the original manufacturer or authorized distributors?
All LMH6643MA 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 LMH6643MA meets industry standards.
7.What is the process for return or replacement of LMH6643MA?
All LMH6643MA units undergo pre-shipment inspection (PSI). If there is an issue with LMH6643MA, 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 LMH6643MA part is unused and in its original packaging.
Return procedure for LMH6643MA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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