Product details


Architecture Fixed Gain/Buffer Number of channels (#) 1 Total supply voltage (Min) (+5V=5, +/-5V=10) 5 Total supply voltage (Max) (+5V=5, +/-5V=10) 30 GBW (Typ) (MHz) 110 BW @ Acl (MHz) 110 Acl, min spec gain (V/V) 1 Slew rate (Typ) (V/us) 1800 Vn at flatband (Typ) (nV/rtHz) 2.8 Vn at 1 kHz (Typ) (nV/rtHz) 5 Iq per channel (Typ) (mA) 11 Vos (offset voltage @ 25 C) (Max) (mV) 35 Features Adjustable BW/IQ/IOUT Rating Catalog Operating temperature range (C) -40 to 125 Input bias current (Max) (pA) 15000 Output current (Typ) (mA) 300 2nd harmonic (dBc) 68 3rd harmonic (dBc) 73 @ MHz 1 open-in-new Find other High-speed op amps (GBW>=50MHz)

Package | Pins | Size

HSOIC (DDA) 8 19 mm² 4.9 x 3.9 TO-263 (KTW) 7 154 mm² 10.1 x 15.24 open-in-new Find other High-speed op amps (GBW>=50MHz)


  • High Slew Rate 1800 V/μs
  • Wide Bandwidth 110 MHz
  • Continuous Output Current ±300 mA
  • Output Current Limit Tolerance ±5 mA ±5%
  • Wide Supply Voltage Range 5V to ±15V
  • Wide Temperature Range −40°C to +125°C
  • Adjustable Current Limit
  • High Capacitive Load Drive
  • Thermal Shutdown Error Flag

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open-in-new Find other High-speed op amps (GBW>=50MHz)


The LMH6321 is a high speed unity gain buffer that slews at 1800 V/µs and has a small signal bandwidth of 110 MHz while driving a 50Ω load. It can drive ±300 mA continuously and will not oscillate while driving large capacitive loads.

The LMH6321 features an adjustable current limit. The current limit is continuously adjustable from 10 mA to 300 ma with a ±5 mA ±5% accuracy. The current limit is set by adjusting an external reference current with a resistor. The current can be easily and instantly adjusted, as needed by connecting the resistor to a DAC to form the reference current. The sourcing and sinking currents share the same current limit.

The LMH6321 is available in a space saving 8-pin SO PowerPAD or a 7-pin DDPAK power package. The SO PowerPAD package features an exposed pad on the bottom of the package to increase its heat sinking capability. The LMH6321 can be used within the feedback loop of an operational amplifier to boost the current output or as a stand alone buffer.

open-in-new Find other High-speed op amps (GBW>=50MHz)
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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
BUF634A ACTIVE 210-MHz, 250-mA high-speed buffer The BUF634A offers higher supply voltage max (36V) , wider bandwidth (210MHz) and lower quiescent current (8.5mA)

Technical documentation

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Type Title Date
* Datasheet LMH6321 300 mA High Speed Buffer with Adjustable Current Limit datasheet (Rev. C) Mar. 18, 2013
Technical article How to reduce distortion in high-voltage, high-frequency signal generation for AWGs Oct. 30, 2018
Technical article What are the advantages of using JFET-input amplifiers in high-speed applications? Jun. 19, 2018
Technical article Unique active mux capability combines buffer and switch into one solution Oct. 10, 2017
E-book The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017
Technical article How to minimize filter loss when you drive an ADC Oct. 20, 2016
User guide LMH6321 PSOP & TO-263 Sin Open Loop HS Buffer Eval Brds (Rev. C) May 03, 2013
Application note Reference Clock Loop Through Application Jan. 16, 2009

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

TI offers this unpopulated Evaluation Board to aid in the evaluation and testing of high-speed Open-Loop Buffer that are offered in the 8-Pin PSOP package. Resistors, capacitors, or any other surface-mount components can be easily mounted on this board in the desired circuit configuration. The (...)

  • Accommodates various high-speed Open-Loop Buffer
  • Allows quick and easy evaluation
  • Serves as reference design to aid in high-speed PCB layout
  • Utilizes surface-mount components


Design tools & simulation

SNOM148.ZIP (2 KB) - PSpice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide
Analog engineer's calculator
ANALOG-ENGINEER-CALC — The Analog Engineer’s Calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting op-amp gain with feedback (...)
  • Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
    • Noise calculations
    • Common unit translation
  • Solves common amplifier circuit design problems
    • Gain selections using standard resistors
    • Filter configurations
    • Total noise for common amplifier configurations
  • (...)
Voltage Divider Determines A Set of Resistors for a Voltage Divider
VOLT-DIVIDER-CALC VOLT-DIVIDER-CALC quickly determines a set of resistors for a voltage divider. This KnowledgeBase Javascript utility can be used to find a set of resistors for a voltage divider to achieve the desired output voltage. This calculator can also be used to design non-inverting attentuation circuits.


CAD/CAE symbols

Package Pins Download
DDPAK/TO-263 (KTW) 7 View options
SO PowerPAD (DDA) 8 View options

Ordering & quality

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  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

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