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Texas Instruments LMH6654MFX
- Part No.:
- LMH6654MFX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMH6654MFX.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,634
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Product details
Overview
LMH6654MFX from Texas Instruments is a single-channel, voltage-feedback operational amplifier optimized for high-speed, low-noise signal conditioning in portable and precision analog systems. It delivers 250 MHz unity-gain bandwidth, 200 V/µs slew rate, 4.5 nV/√Hz input voltage noise, ±2.5 V to ±6 V dual-supply operation, and rail-to-rail output swing into 100 Ω - enabling high-fidelity ADC driver and video signal amplification at minimal power (4.5 mA/channel).
For engineers reviewing the LMH6654MFX datasheet, LMH6654MFX pinout, LMH6654MFX application, or LMH6654MFX equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options - all grounded in TI's SNOS956E datasheet (Rev. E, August 2014) and official device documentation.
Technical Context
The LMH6654MFX employs a voltage-feedback architecture built on TI's VIP10™ complementary bipolar process, supporting stable unity-gain operation with 50° phase margin. Its input stage extends 150 mV below the negative rail and within 1.3 V of the positive rail, enabling true single-supply use with ±2.5 V to ±6 V operation.
It achieves 25 ns settling time to 0.01% with 2 V step input and maintains <0.1 dB gain flatness up to 18 MHz at AV = +1. Input-referred noise remains constant at 4.5 nV/√Hz above 0.1 MHz, and harmonic distortion stays below −80 dBc (2nd) and −85 dBc (3rd) at 5 MHz under ±5 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 250 MHz - enables stable closed-loop operation at high frequencies without external compensation. |
| Slew Rate | 200 V/µs - supports fast transient response for pulse and video signals without slew-induced distortion. |
| Input Voltage Noise | 4.5 nV/√Hz (≥0.1 MHz) - preserves SNR in low-amplitude, wideband sensor and preamp stages. |
| Supply Current per Channel | 4.5 mA - balances speed and power efficiency for battery-powered instrumentation and portable receivers. |
| Output Swing (RL = 100 Ω) | −3.6 V to +3.4 V (±5 V supply) - delivers >7 VPP dynamic range into moderate loads for ADC interface compliance. |
| Input Common-Mode Range | −5.15 V to +3.7 V (±5 V supply) - allows direct interfacing with ground-referenced sources and single-ended inputs. |
| Settling Time (0.01%) | 25 ns - meets timing requirements for high-speed data acquisition sampling at ≥20 MSPS. |
Pinout & Package
LMH6654MFX is supplied in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and thermal resistance RθJA = 172 °C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Amplified signal output node; capable of sourcing/sinking ≥130 mA into 100 Ω load. |
| 2 | Inverting Input (−IN) | Differential input terminal; accepts feedback network connection for precise gain control. |
| 3 | Non-inverting Input (+IN) | Differential input terminal; used for reference or signal injection in non-inverting configurations. |
| 4 | Negative Supply (V−) | Ground or negative rail connection; supports operation down to −6 V with 150 mV input headroom. |
| 5 | Positive Supply (V+) | Positive rail connection; accepts up to +6 V; input common-mode extends within 1.3 V of this rail. |
| 6, 7, 8 | No Connection (N/C) | Unbonded pins; must remain unconnected per TI design - no internal circuitry or thermal function. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage Feedback Architecture | Enables predictable bandwidth scaling with gain (GBWP ≈ 260 MHz), simplifying stability analysis vs. current-feedback op-amps. |
| Rail-to-Rail Output Swing | Delivers >95% of full supply voltage swing into 100 Ω, maximizing dynamic range for ±5 V systems driving ADCs. |
| Low Input Bias Current | 5–18 µA typical (±5 V) - minimizes DC error in high-impedance sensor interfaces and active filter feedback paths. |
| Single-Supply Capable Input Stage | Input common-mode range includes −5.15 V (150 mV below V−) and reaches +3.7 V - supports ground-referenced inputs on dual supplies. |
| High PSRR & CMRR | 76 dB PSRR and ≥70 dB CMRR over 0–100 kHz - rejects supply ripple and common-mode interference in noisy mixed-signal PCBs. |
Applications
| ADC Driver | Consumer Video Amplifier |
|---|---|
|
Use Scenario: Driving the input of a 12-bit, 40 MSPS SAR or pipeline ADC in a portable ultrasound front-end. IC Role / Device Role / Timing Role: Buffering and level-shifting analog sensor output while preserving bandwidth and minimizing noise contribution before digitization. Use Value: 25 ns settling time ensures accurate sampling at 40 MSPS; 4.5 nV/√Hz noise adds <0.5 LSB RMS noise to 12-bit conversion. |
Use Scenario: Amplifying composite NTSC video signals in set-top box output stages prior to connector transmission. IC Role / Device Role / Timing Role: High-fidelity video buffer with minimal differential gain/phase error and flat frequency response across 0–5 MHz. Use Value: 0.01% DG and 0.025° DP performance meets NTSC broadcast standards; 18 MHz 0.1 dB flatness covers full baseband. |
| Active Filter Stage | Pulse Delay Circuit |
|
Use Scenario: Implementing a 4-pole, 10 MHz low-pass Bessel filter in a high-speed test equipment signal path. IC Role / Device Role / Timing Role: Precision gain block in multiple-feedback (MFB) topology, maintaining phase linearity and group delay consistency. Use Value: 50° phase margin and 250 MHz GBWP allow stable 10 MHz filter design without peaking or overshoot. |
Use Scenario: Generating precisely timed, low-jitter analog pulses for laser diode triggering in industrial LiDAR modules. IC Role / Device Role / Timing Role: Fast-settling comparator replacement or pulse-shaping amplifier with sub-ns edge fidelity. Use Value: 1.4 ns rise time and 25 ns 0.01% settling enable <100 ps timing uncertainty in 10 ns pulse generation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-noise op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6629MA/NOPB | Higher bandwidth (1.5 GHz), lower noise (1.4 nV/√Hz), but higher supply current (12.5 mA) and narrower supply range (±2.5 V only). | Better suited for RF IF amplification or ultra-low-noise preamps where power budget allows. | Select LMH6629MA/NOPB when >1 GHz bandwidth or <2 nV/√Hz noise is required; avoid if 4.5 mA max supply current is critical. |
| THS3201DR | Current-feedback architecture, 1.8 GHz bandwidth, 1.9 nV/√Hz noise, but requires careful feedback resistor selection and lacks rail-to-rail output. | Preferred for fixed-gain, very-high-frequency (>100 MHz) applications where gain stability is less critical than raw speed. | Choose THS3201DR only for gain ≥+5, high-Z loads, and designs tolerant of CFB layout sensitivity; not drop-in for LMH6654MFX. |
Compared with LMH6654MFX, LMH6629MA/NOPB trades power efficiency for extreme bandwidth and noise performance, while THS3201DR offers superior speed at the cost of design complexity and reduced DC precision - making LMH6654MFX the optimal balance for portable, medium-bandwidth, low-power signal chains.
Availability
LMH6654MFX is available at Aetrix Electronics and suitable for ADC driver, consumer video, active filter, and pulse delay applications requiring stable component supply, long-term manufacturability, and TI-qualified production lots.
Supply support for LMH6654MFX 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 high-performance op-amp innovation.
The LMH6654MFX belongs to TI's LMH high-speed amplifier family, designed specifically for portable, low-power, wideband analog signal conditioning - emphasizing noise-performance trade-offs, rail-compatible operation, and robust stability across supply voltages.
FAQ
What is the maximum operating temperature range for the LMH6654MFX?
The LMH6654MFX is rated for operation from −40°C to +85°C ambient temperature, as specified in Section 6.3 (Recommended Operating Conditions) of the SNOS956E datasheet. Junction temperature must remain ≤150°C under all conditions, and thermal design should account for RθJA = 172 °C/W in SOIC packaging. Derating is required above 70°C ambient for continuous full-load operation.
Does the LMH6654MFX support single-supply operation?
Yes, the LMH6654MFX supports true single-supply operation: its input common-mode voltage range extends from −5.15 V to +3.7 V (with ±5 V supplies), meaning it accepts inputs 150 mV below V− and within 1.3 V of V+. When powered from 0 V and +5 V, the input range is −0.15 V to +3.7 V, enabling ground-referenced signal handling without level shifting - confirmed in Table 6.5 and Figure 10 of SNOS956E.
What is the recommended feedback resistor value for unity-gain configuration of the LMH6654MFX?
Texas Instruments recommends a 25 Ω feedback resistor for unity-gain (voltage follower) operation, not a direct short. This value damps parasitic inductance in the feedback path, improving stability and reducing ringing - as detailed in Section 7.2.1.1 of SNOS956E. For gains ≥+2, a 402 Ω resistor is specified for optimal bandwidth and distortion performance.
Can the LMH6654MFX drive a 50 Ω coaxial cable directly?
The LMH6654MFX can drive 50 Ω loads but is not optimized for direct 50 Ω source termination. Its output swing into 100 Ω is −3.6 V to +3.4 V (±5 V), implying ~±1.8 V into 50 Ω - sufficient for many applications. However, TI recommends using a series isolation resistor (e.g., 50 Ω) between output and cable to prevent instability with capacitive loads, as shown in Figure 41 of SNOS956E.
Is the LMH6654MFX pin-compatible with other devices in the LMH66xx family?
No - the LMH6654MFX (single, 8-pin SOIC) has a unique pinout distinct from LMH6655 (dual, 8-pin SOIC/VSSOP) and LMH6629 (single, 8-pin SOIC but different pin mapping). Pin 1 is OUTPUT on LMH6654MFX, whereas LMH6655 uses Pin 1 for N/C and Pin 2 for −IN A. Direct substitution without PCB revision is not supported; always verify pin functions against the specific device's Pin Configuration table (Section 5 of SNOS956E).
LMH6654MFX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 200V/µs
- Gain Bandwidth Product:
- 260 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 4.5mA
- Current - Output / Channel:
- 120 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LMH6654MFX FAQ
1.How can I place an order for LMH6654MFX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6654MFX 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 LMH6654MFX reliable?
The price and inventory of LMH6654MFX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6654MFX is usually 5 days.
3.What payment methods are accepted for LMH6654MFX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6654MFX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6654MFX?
LMH6654MFX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6654MFX 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 LMH6654MFX?
For technical support, including LMH6654MFX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6654MFX requirements.
6.How does Aetrix verify that LMH6654MFX is sourced from the original manufacturer or authorized distributors?
All LMH6654MFX 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 LMH6654MFX meets industry standards.
7.What is the process for return or replacement of LMH6654MFX?
All LMH6654MFX units undergo pre-shipment inspection (PSI). If there is an issue with LMH6654MFX, 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 LMH6654MFX part is unused and in its original packaging.
Return procedure for LMH6654MFX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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