Texas Instruments LMH6629SDX/NOPB

Overview

LMH6629SDX/NOPB from Texas Instruments is an ultra-low-noise, high-speed voltage-feedback operational amplifier in WSON-8 package, featuring 0.69 nV/√Hz input voltage noise, 900 MHz −3dB bandwidth at AV = 10 V/V, and ±250 mA output drive capability-designed for ultrasound pre-amplifiers, transimpedance amplifiers, and wideband active filters requiring precision AC/DC performance.

For engineers reviewing the LMH6629SDX/NOPB datasheet, LMH6629SDX/NOPB pinout, LMH6629SDX/NOPB application, or LMH6629SDX/NOPB equivalent, key selection criteria include its selectable minimum gain (≥4 or ≥10 V/V via COMP pin), 75 ns enable time, 1600 V/μs slew rate, and rail-to-rail output swing within 0.8 V of supplies on 2.7–5.5 V operation.

Technical Context

The LMH6629SDX/NOPB uses a proprietary SiGe process to achieve simultaneous high speed and ultra-low noise. Its internal compensation architecture allows user-selectable minimum stable gain (4 V/V or 10 V/V) via the COMP pin-eliminating external compensation capacitors required by competing amplifiers.

It supports single-supply operation with input common-mode range extending 0.3 V below ground and output swing to within 0.8 V of rails. The PD (power-down) pin enables fast 75 ns activation and 80 ns deactivation, reducing quiescent current from 15.5 mA to 1.1 mA in shutdown mode.

Key Specifications

Pinout & Package

LMH6629SDX/NOPB is housed in a 3.0 mm × 3.0 mm, 0.75 mm height, thermally enhanced WSON-8 package (NGQ08A) with exposed thermal pad. Pin 1 is OUT; pin 5 is V−; pin 8 is V+; pin 6 is COMP; pin 1 is PD (power-down); pin 2 is FB (feedback); pins 3 and 4 are IN+ and IN− respectively.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed, low-noise operational amplifier applications.

Compared with LMH6629SDX/NOPB, LMH6624MF/NOPB trades gain flexibility and power control for smaller size, while ADA4898-1ARZ offers superior DC specs but lacks the RF-grade bandwidth and ultra-low noise required for demanding high-frequency analog front-ends.

Availability

LMH6629SDX/NOPB is available at Aetrix Electronics and suitable for ultrasound imaging systems, optical transimpedance modules, wideband test equipment, and 5G base-station IF amplifiers requiring stable component supply, long-term production continuity, and TI-authorized traceability.

Supply support for LMH6629SDX/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 delivering analog and embedded processing solutions, with over 90 years of innovation in high-performance analog ICs and manufacturing excellence.

The LMH6629SDX/NOPB belongs to TI's high-speed precision op-amp product line, engineered specifically for applications demanding simultaneous ultra-low noise, wide bandwidth, and robust output drive-targeting medical imaging, optical sensing, and communications infrastructure.

FAQ

What is the minimum stable gain configuration for LMH6629SDX/NOPB?

The LMH6629SDX/NOPB supports two internally compensated minimum stable gains: ≥4 V/V when the COMP pin is pulled low, and ≥10 V/V when COMP is high or left open. This eliminates need for external compensation capacitors and allows optimization of bandwidth versus phase margin per application requirement. The WSON-8 package enables this user-selectable feature; the SOT-23-5 variant fixes gain at ≥10 V/V.

Does LMH6629SDX/NOPB support true single-supply operation?

Yes, LMH6629SDX/NOPB supports true single-supply operation from 2.7 V to 5.5 V. Its input common-mode range extends to −0.3 V (below ground), and its output swings to within 0.8 V of both supply rails-enabling full-scale signal handling in 3.3 V and 5 V systems without level-shifting circuitry. Input bias current remains stable across the full common-mode range.

How does the power-down (PD) pin function on LMH6629SDX/NOPB?

The PD pin on LMH6629SDX/NOPB is an active-low digital control input. When pulled low, it disables the amplifier core, reducing supply current from 15.5 mA (typical) to 1.1 mA (typical) while maintaining pin states. Enable time is 75 ns and disable time is 80 ns. The pin accepts standard CMOS logic levels (VIH = 2.5 V min, VIL = 0.8 V max) and exhibits low input bias current (<±0.3 µA).

What is the thermal performance of LMH6629SDX/NOPB in its WSON-8 package?

LMH6629SDX/NOPB in the WSON-8 (NGQ08A) package has a junction-to-ambient thermal resistance (RθJA) of 71 °C/W, significantly lower than the SOT-23-5 variant (179 °C/W). This enables higher continuous output current (±250 mA) and sustained operation at elevated ambient temperatures up to +125 °C, provided the thermal pad is soldered to a minimum 100 mm² copper pour with ≥4 thermal vias.

Can LMH6629SDX/NOPB drive a 50 Ω load directly?

Yes, LMH6629SDX/NOPB is specified to drive ±250 mA continuously and can directly terminate into 50 Ω loads at gains ≥4 V/V. At AV = 10 V/V and VO = 2 VPP, it maintains 900 MHz −3dB bandwidth into 100 Ω || 2.5 V, and retains >330 MHz bandwidth into 50 Ω with proper PCB layout (short traces, ground plane, local decoupling). Output voltage swing is reduced to ~3.2 VPP (into 50 Ω) at 5 V supply.