Product details


Architecture Fixed Gain/Buffer Number of channels (#) 1 Total supply voltage (Min) (+5V=5, +/-5V=10) 4.5 Total supply voltage (Max) (+5V=5, +/-5V=10) 36 GBW (Typ) (MHz) 240 BW @ Acl (MHz) 210 Acl, min spec gain (V/V) 1 Slew rate (Typ) (V/us) 3750 Vn at flatband (Typ) (nV/rtHz) 3.4 Vn at 1 kHz (Typ) (nV/rtHz) 3.4 Iq per channel (Typ) (mA) 8.5 Vos (offset voltage @ 25 C) (Max) (mV) 60 Rail-to-rail No Features Adjustable BW/IQ/IOUT Rating Catalog Operating temperature range (C) -40 to 125 Input bias current (Max) (pA) 1600000 Offset drift (Typ) (uV/C) 175 Output current (Typ) (mA) 250 2nd harmonic (dBc) -77 3rd harmonic (dBc) -79 @ MHz 0.02 open-in-new Find other High-speed op amps (GBW>=50MHz)

Package | Pins | Size

HSOIC (DDA) 8 - SOIC (D) 8 19 mm² 4.9 x 3.9 VSON (DRB) 8 9 mm² 3 x 3 VSON (DRB) 8 - open-in-new Find other High-speed op amps (GBW>=50MHz)


  • Pin-selected bandwidth: 35 MHz to 210 MHz
  • High output current: 250 mA
  • Slew rate: 3750 V/µs
  • Low quiescent current: 1.5 mA (35-MHz BW)
  • Wide supply range: ±2.25 V to ±18 V
  • Internal output current limit
  • Thermal shutdown protection
  • Available in packages with thermal pad
  • Extended temperature operation:
    –40°C to +125°C

All trademarks are the property of their respective owners.

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


The BUF634A is a high-performance, high-fidelity, open-loop buffer capable of driving 250 mA of output current. The BUF634A is a 36-V device with bandwidth adjustable from 35 MHz to 210 MHz by varying the value of an external resistor between the V– and BW pins. The BUF634A can be used as a standalone open-loop driver, or inside the feedback loop of a precision op amp to provide both high-precision as well as large output current drive with improved capacitive load drive.

For low-power applications, the BUF634A operates on a 1.5-mA quiescent current with a 250-mA output, 3750-V/µs slew rate, and 35-MHz bandwidth. The device consumes 8.5-mA quiescent current in wide-bandwidth mode with a 210-MHz bandwidth. The BUF634A is fully protected by an internal current limit in its output stage and by thermal shutdown, making the device rugged and easy to use.

The BUF634A is rated to function over the extended industrial temperature range of –40°C to +125°C. The BUF634A comes in three packages: D (SOIC), DRB (VSON), and DDA (HSOIC). The DRB (VSON) and DDA (HSOIC) packages have excellent thermal performance resulting from the thermal pad on the bottom side. The DRB package comes in a very small form factor of 3.0 mm × 3.0 mm, making the device a very suitable option for portable and size-constrained applications.

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

Request samples

Preproduction samples are available (XBUF634AIDDAT and XBUF634AIDRBT). Request Now

Technical documentation

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
The BUF634ADEVM is an evaluation module (EVM) for the BUF634A high-speed buffer in the D (8-pin SOIC) package. The BUF634ADEVM features two BUF634A devices and is designed to quickly demonstrate the functionality and versatility of the buffer. Optionally, the buffers can be configured as outputs for (...)
  • Easy evaluation with standard benchtop test equipment
  • Includes connections for audio inputs and outputs
  • Board has option to form composite loop with dual SOIC op-amp
  • Configurable for split or single supply operation

Design tools & simulation

SBOMAY1A.ZIP (19 KB) - PSpice Model
SBOMAY2A.TSC (17 KB) - TINA-TI Spice Model
SBOMB59.TSC (17 KB) - TINA-TI Reference Design
SBOMB63.ZIP (16 KB) - PSpice Model
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
SO PowerPAD (DDA) 8 View options
SOIC (D) 8 View options
SON (DRB) 8 View options

Ordering & quality

Support & training

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