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Texas Instruments LMH6629MFX/NOPB
- Part No.:
- LMH6629MFX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMH6629MFX/NOPB.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,598
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Product details
Overview
LMH6629MFX/NOPB from Texas Instruments is an ultra-low-noise, high-speed voltage-feedback operational amplifier in WSON-8 package, specified for 5 V supply, 100 Ω load, and gain of 10 V/V. It delivers 900 MHz small-signal −3 dB bandwidth, 0.69 nV/√Hz input voltage noise, 1600 V/μs slew rate, and ±250 mA output drive - enabling precision wideband signal conditioning in ultrasound pre-amps and transimpedance amplifiers.
For engineers reviewing the LMH6629MFX/NOPB datasheet, LMH6629MFX/NOPB pinout, LMH6629MFX/NOPB application, or LMH6629MFX/NOPB equivalent, key selection criteria include its user-selectable internal compensation (min. gain ≥4 or ≥10 V/V via COMP pin), 75 ns enable time, and rail-to-rail output swing within 0.8 V of rails on 2.7–5.5 V supplies.
Technical Context
The LMH6629MFX/NOPB uses a proprietary SiGe process to achieve simultaneous high speed and ultra-low noise. Its dual-compensation architecture allows stable operation at minimum gains of 4 V/V (COMP = LO) or 10 V/V (COMP = HI), eliminating external compensation capacitors required by competitive op-amps.
It features a shutdown function (PD pin) with 75 ns enable time and 80 ns disable time, and supports single-supply operation with input common-mode range extending 0.3 V below ground and output swing to within 0.8 V of either rail - critical for dc-coupled instrumentation and medical imaging front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3dB Bandwidth | 900 MHz at AV = 10 V/V, RL = 100 Ω - enables RF and optical signal chain amplification up to UHF frequencies |
| Input Voltage Noise | 0.69 nV/√Hz - preserves SNR in low-level sensor interfaces like photodiode TIA stages |
| Slew Rate | 1600 V/μs - supports fast transient response in pulse-amplifier and ADC driver applications |
| Output Current | ±250 mA - drives heavy loads including 50 Ω transmission lines and active filter networks |
| Supply Voltage Range | 2.7 V to 5.5 V - compatible with modern low-voltage systems while maintaining performance at 5 V |
| Enable Time | 75 ns - allows rapid power cycling in battery-powered portable ultrasound or test equipment |
| Input Offset Voltage | ±800 µV max over −40°C to +125°C - ensures dc accuracy in precision instrumentation amplifiers |
Pinout & Package
LMH6629MFX/NOPB is housed in a 3.0 mm × 3.0 mm, 0.75 mm height, thermally enhanced WSON-8 package with exposed thermal pad (NGQ08A). Pin 1 is OUT; pin 2 is V−; pin 3 is +IN; pin 4 is −IN; pin 5 is FB; pin 6 is COMP; pin 7 is PD; pin 8 is V+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Amplifier output | Delivers full ±250 mA linear output current; rail-to-rail swing within 0.8 V of V+ or V− |
| V− (Pin 2) | Negative supply | Supports single-supply operation down to 2.7 V; input CM range extends 0.3 V below this pin |
| +IN (Pin 3) | Non-inverting input | Differential input pair with 1.7 pF common-mode capacitance and 450 kΩ input resistance |
| −IN (Pin 4) | Inverting input | Accepts feedback network; differential input capacitance is 4 pF |
| FB (Pin 5) | Feedback node | Internal connection point for unity-gain stable configurations; used in transimpedance topologies |
| COMP (Pin 6) | Compensation select | Logic-controlled pin: LOW sets min. stable gain to 4 V/V; HIGH sets to 10 V/V |
| PD (Pin 7) | Power-down control | Active-low shutdown: pulls supply current from 15.5 mA to 1.1 mA; 75 ns wake-up latency |
| V+ (Pin 8) | Positive supply | Accepts up to 5.5 V; PSRR > 78 dB across 10 Hz–10 MHz for noise-sensitive analog stages |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable internal compensation | Eliminates external compensation capacitors and layout sensitivity for gains ≥4 or ≥10 V/V |
| Rail-to-rail output swing | Drives to within 0.8 V of V+ or V− on 5 V supply - simplifies single-supply biasing in portable systems |
| Ultra-low input voltage noise | 0.69 nV/√Hz at f > 1 MHz - maintains dynamic range in low-amplitude, high-bandwidth sensor interfaces |
| High linearity at 1 MHz | HD2 = −90 dBc and HD3 = −94 dBc at 2 VPP - meets distortion requirements for medical imaging and base-station IF amps |
| Thermally optimized WSON-8 package | RθJA = 71 °C/W - sustains continuous ±250 mA output without thermal derating in compact PCB layouts |
Applications
| Ultrasound Pre-amplifiers | Transimpedance Amplifiers |
|---|---|
Use Scenario: Amplifying weak, high-frequency signals from piezoelectric transducers in portable ultrasound machines. IC Role / Device Role / Timing Role: Primary low-noise gain stage with dc-coupled input and wide 900 MHz bandwidth. Use Value: 0.69 nV/√Hz noise floor preserves signal integrity of microvolt-level echoes; ±250 mA output drives subsequent ADC drivers. | Use Scenario: Converting photocurrent from high-speed photodiodes in fiber-optic receivers or LiDAR front-ends. IC Role / Device Role / Timing Role: Transimpedance amplifier with integrated FB pin and low input capacitance (4 pF diff). Use Value: 1600 V/μs slew rate handles fast optical pulses; COMP pin configures stability for varying photodiode capacitance. |
| Wideband Active Filters | Low-Noise Instrumentation Amplifiers |
Use Scenario: Implementing 2nd- or 3rd-order high-frequency filters in test and measurement equipment. IC Role / Device Role / Timing Role: Gain block in multiple-feedback or state-variable filter topologies requiring >500 MHz closed-loop bandwidth. Use Value: 900 MHz −3 dB bandwidth and 0.1 dB flatness to 95 MHz ensure minimal phase distortion in multi-MHz signal paths. | Use Scenario: Building precision, high-speed difference amplifiers for industrial data acquisition systems. IC Role / Device Role / Timing Role: Core amplifier in three-op-amp IA configuration, leveraging low VOS drift (±0.45 µV/°C) and high CMRR (87 dB). Use Value: ±800 µV max VOS over temperature ensures <0.1% gain error in 100× gain stages; rail-to-rail output interfaces directly to SAR ADCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-noise operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6624MF/NOPB | Lower noise (0.92 nV/√Hz), no shutdown or COMP pin; SOT-23-5 only; 1.5 GHz bandwidth but higher supply current (18.5 mA) | Lacks power-down and gain-select features; unsuitable for battery-powered or gain-flexible designs | Select when absolute bandwidth >1 GHz is prioritized over power control and gain configurability |
| OPA657U | Higher bandwidth (1.6 GHz), lower noise (0.92 nV/√Hz), fixed gain ≥5 V/V; SOIC-8; no PD/COMP pins; 22 mA supply current | No internal shutdown or compensation selection; larger package increases parasitic capacitance in RF layouts | Choose for ultra-high-frequency (>1 GHz) photodiode TIAs where board space permits SOIC-8 and power budget allows |
Compared with LMH6624MF/NOPB and OPA657U, the LMH6629MFX/NOPB uniquely combines sub-1 nV/√Hz noise, 900 MHz bandwidth, user-selectable gain stability, and 75 ns enable time in a 3 mm × 3 mm WSON package - making it optimal for space-constrained, battery-aware, and gain-adaptable wideband analog systems.
Availability
LMH6629MFX/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 second-source availability.
Supply support for LMH6629MFX/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 LMH6629MFX/NOPB belongs to TI's LMH ultra-low-noise, high-speed op-amp family, designed specifically for demanding wideband applications in medical imaging, optical communications, and test equipment where noise, speed, and power efficiency must coexist.
FAQ
What is the minimum stable gain for LMH6629MFX/NOPB when the COMP pin is pulled low?
The LMH6629MFX/NOPB achieves minimum stable gain of 4 V/V when the COMP pin is driven logic low. This configuration eliminates need for external compensation components and is validated for 5 V supply and 100 Ω load per TI SNOSB18I datasheet Section 6.5.
Does LMH6629MFX/NOPB support true single-supply operation with input below ground?
Yes, LMH6629MFX/NOPB supports true single-supply operation: its input common-mode voltage range extends to −0.3 V (0.3 V below V−), allowing dc-coupled inputs referenced to ground even when V− = 0 V, as confirmed in Electrical Characteristics Table 6.5.
What is the thermal resistance (RθJA) of the LMH6629MFX/NOPB WSON-8 package?
The LMH6629MFX/NOPB in WSON-8 (NGQ08A) package has a junction-to-ambient thermal resistance (RθJA) of 71 °C/W, measured under standard JEDEC JESD51-7 conditions - significantly lower than the 179 °C/W of the SOT-23-5 variant, enabling higher continuous output current in compact layouts.
Can LMH6629MFX/NOPB drive a 50 Ω load directly?
Yes, LMH6629MFX/NOPB can drive a 50 Ω load directly: its ±250 mA linear output current specification applies to RL = 100 Ω terminated to mid-supply, and the device maintains stability and linearity into 50 Ω with appropriate layout (short traces, proper grounding), as verified in TI's typical performance curves (Figures 32–35).
How does the PD pin behavior differ between LMH6629MFX/NOPB and the SOT-23-5 version of LMH6629?
The PD (power-down) pin functionality is identical across packages: logic-low assertion reduces supply current from ~15.5 mA to ~1.1 mA and disables output. However, LMH6629MFX/NOPB (WSON-8) is the only variant with both PD and COMP pins; the SOT-23-5 version lacks the COMP pin and is internally compensated for min. gain ≥10 V/V only.
LMH6629MFX/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
LMH6629MFX/NOPB FAQ
1.How can I place an order for LMH6629MFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMH6629MFX/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 LMH6629MFX/NOPB reliable?
The price and inventory of LMH6629MFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMH6629MFX/NOPB is usually 5 days.
3.What payment methods are accepted for LMH6629MFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMH6629MFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMH6629MFX/NOPB?
LMH6629MFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMH6629MFX/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 LMH6629MFX/NOPB?
For technical support, including LMH6629MFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMH6629MFX/NOPB requirements.
6.How does Aetrix verify that LMH6629MFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMH6629MFX/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 LMH6629MFX/NOPB meets industry standards.
7.What is the process for return or replacement of LMH6629MFX/NOPB?
All LMH6629MFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMH6629MFX/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 LMH6629MFX/NOPB part is unused and in its original packaging.
Return procedure for LMH6629MFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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