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Texas Instruments LMH6629MF/NOPB
- Part No.:
- LMH6629MF/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMH6629MF/NOPB.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,711
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Product details
Overview
LMH6629MF/NOPB from Texas Instruments is an ultra-low-noise, high-speed voltage-feedback operational amplifier in a 5-pin SOT-23 package, delivering 0.69 nV/√Hz input voltage noise, 1600 V/µs slew rate, and 1000 MHz small-signal −3dB bandwidth (SOT-23-5) at 5 V supply. It supports minimum stable gain of 10 V/V, ±250 mA output drive, and operates from 2.7 V to 5.5 V - optimized for ultrasound pre-amplifiers, transimpedance amplifiers, and wideband active filters.
For engineers reviewing the LMH6629MF/NOPB datasheet, LMH6629MF/NOPB pinout, LMH6629MF/NOPB application, or LMH6629MF/NOPB equivalent, key selection criteria include its fixed internal compensation for gain ≥10 V/V, 75 ns enable time, low distortion (HD2 = −90 dBc @ 1 MHz), rail-to-rail output swing capability (0.8 V from rails), and validated performance in single-supply, high-fidelity analog front-ends.
Technical Context
The LMH6629MF/NOPB uses a proprietary SiGe process to achieve ultra-low input voltage noise (0.69 nV/√Hz) and current noise (2.6 pA/√Hz), enabling high dynamic range in precision DC-coupled and AC-coupled signal chains. Its voltage-feedback architecture provides predictable stability with fixed internal compensation set for minimum gain of 10 V/V in the SOT-23-5 variant.
It features a shutdown function via the PD pin (logic-compatible thresholds: VIL ≤ 0.8 V, VIH ≥ 2.0 V), reducing supply current to 0.89–1.5 mA in shutdown mode. The device maintains >70 dB CMRR and PSRR across −40°C to +125°C, with input common-mode range extending 0.3 V below ground and output swing within 0.8 V of both rails under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 0.69 nV/√Hz - enables high-resolution signal acquisition in low-level sensor interfaces and medical imaging front-ends. |
| Small-Signal Bandwidth | 1000 MHz @ 5 V, AV = 10 V/V - supports wideband applications up to ~1 GHz without external compensation. |
| Slew Rate | 1600 V/µs - ensures faithful reproduction of fast transient signals (e.g., pulsed ultrasound echoes) with minimal distortion. |
| Output Drive | ±250 mA - drives heavy loads including 100 Ω terminations and capacitive cables directly, reducing need for buffer stages. |
| Supply Range | 2.7 V to 5.5 V - compatible with modern low-voltage systems while maintaining full performance at 3.3 V and 5 V rails. |
| Enable Time | 75 ns - allows rapid power cycling in time-gated systems such as time-of-flight sensors and pulsed amplifiers. |
| HD2 / HD3 | −90 dBc / −94 dBc @ 1 MHz, 2 VPP - meets stringent linearity requirements in instrumentation and RF receiver IF stages. |
Pinout & Package
LMH6629MF/NOPB is housed in a RoHS-compliant 5-pin SOT-23 (DBV) package (2.90 mm × 1.60 mm), optimized for space-constrained PCB layouts and high-frequency routing.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Delivers high-current, low-distortion output; capable of sourcing/sinking ±250 mA into 100 Ω loads. |
| 2 (V−) | Negative supply | Accepts ground or negative rail; input common-mode extends 0.3 V below this pin, enabling true single-supply operation. |
| 3 (+IN) | Non-inverting input | High-impedance node (RCM = 450 kΩ); differential input capacitance = 4 pF - critical for transimpedance stability analysis. |
| 4 (−IN) | Inverting input | Primary feedback node; used with external resistors for gain setting; input bias current = −23 µA (typ) at 25°C. |
| 5 (V+) | Positive supply | Accepts 2.7–5.5 V; PSRR = 78 dB - suppresses supply ripple in sensitive analog signal paths. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input voltage noise | 0.69 nV/√Hz - preserves SNR in low-amplitude signal conditioning (e.g., photodiode or piezoelectric sensor outputs). |
| Fixed gain ≥10 V/V compensation | No external capacitor required - eliminates layout sensitivity and phase-margin tuning for standard gain configurations. |
| Rail-to-rail output swing | 0.8 V from each rail into 100 Ω - maximizes dynamic range in 3.3 V or 5 V single-supply systems without level-shifting. |
| Fast enable/disable | 75 ns enable / 80 ns disable - supports burst-mode operation in portable ultrasound and laser time-of-flight systems. |
| Low distortion at high frequency | HD3 = −94 dBc @ 1 MHz - maintains spectral purity in wideband active filters and baseband signal reconstruction. |
Applications
| Ultrasound Pre-amplifier | Transimpedance Amplifier |
|---|---|
Use Scenario: Amplifying weak, high-frequency echo signals from piezoelectric transducers in portable diagnostic ultrasound systems. IC Role / Device Role / Timing Role: Primary low-noise gain stage in analog front-end, operating at 1–15 MHz with DC-coupled signal path. Use Value: 0.69 nV/√Hz noise floor and 1000 MHz bandwidth preserve pulse fidelity and axial resolution without requiring cascaded amplifiers. |
Use Scenario: Converting photocurrent from high-speed photodiodes in optical receivers and LiDAR front-ends. IC Role / Device Role / Timing Role: Transimpedance amplifier with programmable gain, driving ADC inputs in time-resolved detection circuits. Use Value: 2.6 pA/√Hz input current noise and 4 pF differential input capacitance minimize total integrated noise in 10–100 MHz bandwidth designs. |
| Wideband Active Filter | Instrumentation Amplifier Core |
Use Scenario: Implementing 2nd- or 4th-order Butterworth/Chebyshev filters in test equipment and spectrum analyzers. IC Role / Device Role / Timing Role: High-speed gain block in multiple-feedback or state-variable filter topologies. Use Value: 1600 V/µs slew rate prevents slew-induced distortion on large-swing filter outputs up to 100 MHz. |
Use Scenario: Serving as the gain-setting amplifier in three-op-amp instrumentation amplifier architectures. IC Role / Device Role / Timing Role: Precision, high-bandwidth difference amplifier with low offset drift (±0.45 µV/°C). Use Value: ±800 µV max input offset and 70+ dB CMRR over temperature ensure accurate DC-coupled differential measurements. |
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 |
|---|---|---|---|
| LMH6624MF/NOPB | Lower bandwidth (1.5 GHz SSBW), higher supply current (18.5 mA), no shutdown pin | Lacks power-down functionality; better suited for always-on, highest-bandwidth applications | Select LMH6624MF/NOPB only when shutdown is unnecessary and >1 GHz bandwidth is required. |
| OPA847IDBVT | Higher noise (0.85 nV/√Hz), lower output drive (±100 mA), 3.5 GHz gain-bandwidth product | Requires external compensation; optimized for very high closed-loop gains (>20 V/V) | Choose OPA847IDBVT for ultra-high-gain, low-capacitance loads where bandwidth exceeds 1 GHz at AV ≥ 20. |
Compared with LMH6629MF/NOPB, LMH6624MF/NOPB trades shutdown capability for marginally higher bandwidth and higher quiescent current, while OPA847IDBVT offers greater gain-bandwidth but demands careful stability design and delivers less output current - making LMH6629MF/NOPB the optimal balance of noise, drive, speed, and power control for 10 V/V–gain front-ends.
Availability
LMH6629MF/NOPB is available at Aetrix Electronics and suitable for ultrasound pre-amplifiers, transimpedance amplifiers, and wideband active filters requiring stable component supply, long-term manufacturability, and guaranteed TI production continuity.
Supply support for LMH6629MF/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 expertise in high-performance op-amps and signal-chain solutions.
The LMH6629MF/NOPB belongs to TI's LMH high-speed amplifier family, engineered specifically for demanding analog front-ends in medical imaging, test equipment, and optical sensing - where ultra-low noise, high slew rate, and robust single-supply operation are essential.
FAQ
What is the minimum stable gain for LMH6629MF/NOPB?
The LMH6629MF/NOPB is internally compensated for a minimum stable gain of 10 V/V in the SOT-23-5 package. Unlike the WSON-8 variant, it does not support user-selectable compensation (COMP pin is not present). This fixed configuration eliminates external compensation components and simplifies layout for standard gain applications.
Does LMH6629MF/NOPB support true single-supply operation?
Yes, LMH6629MF/NOPB supports true single-supply operation: its input common-mode range extends 0.3 V below V− (including ground), and its output swings to within 0.8 V of both supply rails under 100 Ω load. At 5 V supply, this yields >3.4 V of usable output swing - ideal for 3.3 V or 5 V systems without dual supplies.
What is the typical supply current of LMH6629MF/NOPB in active and shutdown modes?
LMH6629MF/NOPB draws 13.7–16.0 mA (typ 14.9 mA) at 3.3 V and 15.5–18.2 mA (typ 16.7 mA) at 5 V in normal operation. In shutdown mode (PD pin low), supply current drops to 0.89–1.5 mA - enabling significant power savings in battery-powered or duty-cycled systems like handheld ultrasound devices.
Can LMH6629MF/NOPB drive a 50 Ω load directly?
Yes, LMH6629MF/NOPB can drive a 50 Ω load directly: its ±250 mA output current rating supports 2.5 VPP into 50 Ω (125 mA peak) with minimal distortion. However, for optimal stability and bandwidth preservation, use series output resistance (e.g., 10–22 Ω) and verify layout parasitics - especially when driving coaxial cables or high-frequency ADC inputs.
How does the noise performance of LMH6629MF/NOPB compare between 3.3 V and 5 V operation?
The input voltage noise of LMH6629MF/NOPB remains constant at 0.69 nV/√Hz across 3.3 V and 5 V supplies, as it is process- and architecture-dependent, not supply-sensitive. Input current noise is also unchanged at 2.6 pA/√Hz. System-level noise may vary slightly due to bandwidth shifts (SSBW = 950 MHz @ 3.3 V vs. 1000 MHz @ 5 V), but core noise density is supply-independent.
LMH6629MF/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1600V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 GHz
- Current - Input Bias:
- 15 µA
- Voltage - Input Offset:
- 150 µV
- Current - Supply:
- 15.5mA
- Current - Output / Channel:
- 250 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LMH6629MF/NOPB FAQ
1.How can I place an order for LMH6629MF/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6629MF/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 LMH6629MF/NOPB reliable?
The price and inventory of LMH6629MF/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6629MF/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6629MF/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6629MF/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6629MF/NOPB?
LMH6629MF/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6629MF/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 LMH6629MF/NOPB?
For technical support, including LMH6629MF/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6629MF/NOPB requirements.
6.How does Aetrix verify that LMH6629MF/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6629MF/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 LMH6629MF/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6629MF/NOPB?
All LMH6629MF/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6629MF/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 LMH6629MF/NOPB part is unused and in its original packaging.
Return procedure for LMH6629MF/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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