BUF634 is not recommended for new designs.
This product continues to be in production to support existing customers. Please consider one of these alternatives:
Drop-in replacement with upgraded functionality to the compared device.
BUF634A ACTIVE 210-MHz, 250-mA high-speed buffer BUF634A has higher slew rate (3750 V/µs) and wider bandwidth (210 MHz) at a 40% lower quiescent current (8.5 mA) and is available at a lower cost

Product details

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  • A newer version of this device is now available: BUF634A
  • High output current: 250 mA
  • Slew rate: 2000 V/µs
  • Pin-selected bandwidth: 30 MHz to 180 MHz
  • Low quiescent current: 1.5 mA (30 MHz BW)
  • Wide supply range: ±2.25 to ±18 V
  • Internal current limit
  • Thermal shutdown protection
  • 8-pin PDIP, SOIC-8, 5-lead TO-220, 5-lead DDPAK-TO-263 surface-mount
  • A newer version of this device is now available: BUF634A
  • High output current: 250 mA
  • Slew rate: 2000 V/µs
  • Pin-selected bandwidth: 30 MHz to 180 MHz
  • Low quiescent current: 1.5 mA (30 MHz BW)
  • Wide supply range: ±2.25 to ±18 V
  • Internal current limit
  • Thermal shutdown protection
  • 8-pin PDIP, SOIC-8, 5-lead TO-220, 5-lead DDPAK-TO-263 surface-mount

The BUF634 is a high speed, unity-gain open-loop buffer recommended for a wide range of applications. The BUF634 can be used inside the feedback loop of op amps to increase output current, eliminate thermal feedback, and improve capacitive load drive.

For low power applications, the BUF634 operates on 1.5-mA quiescent current with 250-mA output,
2000-V/µs slew rate, and 30-MHz bandwidth. Bandwidth can be adjusted from 30 MHz to 180 MHz by connecting a resistor between V– and the BW Pin.

Output circuitry is fully protected by internal current limit and thermal shut-down, making the device rugged and easy to use.

The BUF634 is available in a variety of packages to suit mechanical and power dissipation requirements. Types include 8-pin PDIP, SOIC-8 surface-mount, 5-lead TO-220, and a 5-lead DDPAK-TO-263 surface-mount plastic power package.

The upgraded device, BUF634A offers a wider bandwidth (210 MHz) and a higher slew rate (3750 V/µs) at 40% lower quiescent current. See the Device Comparison Table for a selection of unity-gain, open-loop buffers from Texas Instruments.

The BUF634 is a high speed, unity-gain open-loop buffer recommended for a wide range of applications. The BUF634 can be used inside the feedback loop of op amps to increase output current, eliminate thermal feedback, and improve capacitive load drive.

For low power applications, the BUF634 operates on 1.5-mA quiescent current with 250-mA output,
2000-V/µs slew rate, and 30-MHz bandwidth. Bandwidth can be adjusted from 30 MHz to 180 MHz by connecting a resistor between V– and the BW Pin.

Output circuitry is fully protected by internal current limit and thermal shut-down, making the device rugged and easy to use.

The BUF634 is available in a variety of packages to suit mechanical and power dissipation requirements. Types include 8-pin PDIP, SOIC-8 surface-mount, 5-lead TO-220, and a 5-lead DDPAK-TO-263 surface-mount plastic power package.

The upgraded device, BUF634A offers a wider bandwidth (210 MHz) and a higher slew rate (3750 V/µs) at 40% lower quiescent current. See the Device Comparison Table for a selection of unity-gain, open-loop buffers from Texas Instruments.

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Technical documentation

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Type Title Date
* Data sheet BUF634 250-mA High-Speed Buffer datasheet (Rev. B) 29 Mar 2019
Application note BUF634A and BUF634 Thermal Performance Comparison 18 Oct 2021
Application note Optimizing LCR Meter Front-End Design for Accurate Impedance Measurements 20 Jan 2021
User guide BUF634AD Evaluation module 18 Feb 2019
Technical article How to reduce distortion in high-voltage, high-frequency signal generation for AWGs 30 Oct 2018
Technical article What are the advantages of using JFET-input amplifiers in high-speed applications? 19 Jun 2018
Technical article Unique active mux capability combines buffer and switch into one solution 10 Oct 2017
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017
Technical article How to minimize filter loss when you drive an ADC 20 Oct 2016
Application note Combining an Amplifier with the BUF634 02 Oct 2000
Application note Add Current Limit to the BUF634 27 Sep 2000
Application note Power Amplifier Stress and Power Handling Limitations 27 Sep 2000

Design & development

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

Evaluation board

BUF634ADRBEVM — 250-mA high-speed buffer evaluation module

The BUF634ADRBEVM is an evaluation module (EVM) for the BUF634A high-speed buffer in the DRB (8-pin DFN) package. The BUF634ADRBEVM features two BUF634AIDRB devices and is designed to quickly demonstrate the functionality and versatility of the buffer. Optionally, the buffers can be configured as (...)
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Simulation model

BUF634 TINA-TI Reference Design (Rev. C)

SBOC135C.TSC (405 KB) - TINA-TI Reference Design
Simulation model

BUF634 PSpice Model (Rev. B)

SBOM003B.ZIP (62 KB) - PSpice Model
Simulation model

BUF634 TINA-TI Spice Model (Rev. B)

SBOM204B.ZIP (10 KB) - TINA-TI Spice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

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 (...)
Calculation tool

ANALOG-ENGINEER-CALC — Analog engineer's calculator

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 (...)
Calculation tool

VOLT-DIVIDER-CALC — Voltage Divider Determines A Set of Resistors for a Voltage Divider

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.

(...)

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Package Pins Download
DDPAK/TO-263 (KTT) 5 View options
PDIP (P) 8 View options
SOIC (D) 8 View options
TO-220 (KC) 5 View options

Ordering & quality

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