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
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
HSOIC (DDA) 8 19 mm² 4.9 x 3.9 SOIC (D) 8 19 mm² 4.9 x 3.9 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) 18 May 2021
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 BUF634Axxx Evaluation Module User's Guide 22 Dec 2020
Certificate BUF634ADDAEVM EU Declaration of Conformity (DoC) 03 Aug 2020
Certificate BUF634ADRBEVM EU Declaration of Conformity (DoC) 03 Aug 2020
Application note Pairing up Op Amp and Buffer for Higher Output Power Plus Speed in ATE 07 Jun 2019
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
Technical article How to minimize filter loss when you drive an ADC 20 Oct 2016

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 (...)
In stock
Limit: 2
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 (...)
In stock
Limit: 5
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 (...)
In stock
Limit: 2
Simulation model

BUF634A TINA-TI SPICE Model (Rev. B)

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

BUF634A for PSPICE Library (Rev. A)

SBOMB63A.ZIP (30 KB) - PSpice 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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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.
Package Pins Download
SO PowerPAD (DDA) 8 View options
SOIC (D) 8 View options
SON (DRB) 8 View options

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