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High-speed op amps (GBW ≥ 50 MHz)

BUF634A

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210-MHz, 250-mA high-speed buffer

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Data sheet

BUF634A

ACTIVE
Data sheet Order now

Product details

Architecture Fixed Gain/Buffer Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 4.5 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 36 GBW (typ) (MHz) 240 BW at Acl (MHz) 210 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 3750 Vn at flatband (typ) (nV√Hz) 3.4 Vn at 1 kHz (typ) (nV√Hz) 3.4 Iq per channel (typ) (mA) 8.5 Vos (offset voltage at 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) (µV/°C) 175 Iout (typ) (mA) 250 2nd harmonic (dBc) -77 3rd harmonic (dBc) -79 Frequency of harmonic distortion measurement (MHz) 0.02
Architecture Fixed Gain/Buffer Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 4.5 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 36 GBW (typ) (MHz) 240 BW at Acl (MHz) 210 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 3750 Vn at flatband (typ) (nV√Hz) 3.4 Vn at 1 kHz (typ) (nV√Hz) 3.4 Iq per channel (typ) (mA) 8.5 Vos (offset voltage at 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) (µV/°C) 175 Iout (typ) (mA) 250 2nd harmonic (dBc) -77 3rd harmonic (dBc) -79 Frequency of harmonic distortion measurement (MHz) 0.02
HSOIC (DDA) 8 29.4 mm² 4.9 x 6 SOIC (D) 8 29.4 mm² 4.9 x 6 VSON (DRB) 8 9 mm² 3 x 3
  • 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
  • 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

The BUF634A device is a high-performance, high-fidelity, open-loop buffer that is capable of driving 250 mA of output current. The BUF634A is a 36-V device with an adjustable bandwidth of 35 MHz to 210 MHz, which is accomplished by varying the value of an external resistor between the V– and BW pins.

The BUF634A device can be used as a standalone open-loop driver, or used inside the feedback loop of a precision op amp to provide both high-precision and large output current drive with improved capacitive load drive.

For low-power applications, the BUF634A device 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 device 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.

The BUF634A device is a high-performance, high-fidelity, open-loop buffer that is capable of driving 250 mA of output current. The BUF634A is a 36-V device with an adjustable bandwidth of 35 MHz to 210 MHz, which is accomplished by varying the value of an external resistor between the V– and BW pins.

The BUF634A device can be used as a standalone open-loop driver, or used inside the feedback loop of a precision op amp to provide both high-precision and large output current drive with improved capacitive load drive.

For low-power applications, the BUF634A device 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 device 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.
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Technical documentation

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Type Title Date
* Data sheet BUF634A 36-V, 210-MHz, 250-mA Output, High-Speed Buffer datasheet (Rev. F) PDF | HTML 18 May 2021
Application note BUF634A and BUF634 Thermal Performance Comparison PDF | HTML 18 Oct 2021
Application brief Optimizing LCR Meter Front-End Design for Accurate Impedance Measurements PDF | HTML 20 Jan 2021
EVM User's guide BUF634Axxx Evaluation Module User's Guide PDF | HTML 22 Dec 2020
Certificate BUF634ADDAEVM EU Declaration of Conformity (DoC) 03 Aug 2020
Certificate BUF634ADRBEVM EU Declaration of Conformity (DoC) 03 Aug 2020
Application brief Pairing up Op Amp and Buffer for Higher Output Power Plus Speed in ATE 07 Jun 2019
EVM User's guide BUF634AD Evaluation module 18 Feb 2019

Design & development

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

Evaluation board

BUF634ADDAEVM — 210-MHz, 250-mA high-speed buffer evaluation module

The BUF634ADDAEVM is an evaluation module (EVM) for the BUF634A high-speed buffer in the DDA (8-pin SO8 w/thermal pad) package. The BUF634ADDAEVM features two BUF634AIDDA devices and is designed to quickly demonstrate the functionality and versatility of the buffer. Optionally, the buffers can be (...)
User guide: PDF | HTML
Not available on TI.com
Evaluation board

BUF634ADEVM — BUF634AD high speed buffer evaluation module

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 (...)
User guide: PDF
Not available on TI.com
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 (...)
User guide: PDF | HTML
Not available on TI.com
Simulation model

BUF634A TINA-TI SPICE Model (Rev. B)

SBOMAY2B.TSC (17 KB) - TINA-TI Spice Model
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Simulation model

BUF634A for PSPICE Library (Rev. A)

SBOMB63A.ZIP (30 KB) - PSpice Model
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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 operational-amplifier (...)
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VOLT-DIVIDER-CALC — Voltage divider calculation tool

The voltage divider calculation tool (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. VOLT-DIVIDER-CALC can also be used to (...)
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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 (...)
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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 (...)
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Reference designs

TIDA-060029 — LCR meter analog front end reference design

This reference design, TIDA-060029 demonstrates an analog signal chain solution for LCR Meter applications using an auto balancing impedance measurement method.
Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
HSOIC (DDA) 8 Ultra Librarian
SOIC (D) 8 Ultra Librarian
VSON (DRB) 8 Ultra Librarian
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