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High-speed op amps (GBW ≥ 50 MHz)

BUF634

ACTIVE

250-mA high-speed buffer - see BUF634A for upgraded version

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Data sheet

A newer version of this product is available

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Drop-in replacement with upgraded functionality to the compared device.
BUF634A ACTIVE 210-MHz, 250-mA high-speed buffer Higher slew rate (3750 V/µs) and wider bandwidth (210 MHz) at a 40% lower quiescent current (8.5 mA)

BUF634

ACTIVE
Data sheet Order now

Product details

Architecture Open Loop/Buffer Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 5 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 36 GBW (typ) (MHz) 180 BW at Acl (MHz) 180 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 2000 Vn at flatband (typ) (nV√Hz) 4 Vn at 1 kHz (typ) (nV√Hz) 4 Iq per channel (typ) (mA) 15 Vos (offset voltage at 25°C) (max) (mV) 100 Rail-to-rail No Features Adjustable BW/IQ/IOUT Rating Catalog Operating temperature range (°C) -40 to 125 Input bias current (max) (pA) 20000000 Offset drift (typ) (µV/°C) 100 Iout (typ) (mA) 250 2nd harmonic (dBc) 75 3rd harmonic (dBc) 83 Frequency of harmonic distortion measurement (MHz) 1
Architecture Open Loop/Buffer Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 5 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 36 GBW (typ) (MHz) 180 BW at Acl (MHz) 180 Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 2000 Vn at flatband (typ) (nV√Hz) 4 Vn at 1 kHz (typ) (nV√Hz) 4 Iq per channel (typ) (mA) 15 Vos (offset voltage at 25°C) (max) (mV) 100 Rail-to-rail No Features Adjustable BW/IQ/IOUT Rating Catalog Operating temperature range (°C) -40 to 125 Input bias current (max) (pA) 20000000 Offset drift (typ) (µV/°C) 100 Iout (typ) (mA) 250 2nd harmonic (dBc) 75 3rd harmonic (dBc) 83 Frequency of harmonic distortion measurement (MHz) 1
TO-220 (KC) 5 45.212 mm² (10.16 mm × 4.45 mm) SOIC (D) 8 29.4 mm² (4.9 mm × 6 mm) TO-263 (KTT) 5 154.8384 mm² (10.16 mm × 15.24 mm)
  • A newer version of this device is now available: BUF634A
  • High output current: 250mA
  • Slew rate: 2000V/µs
  • Pin-selected bandwidth: 30MHz to 180MHz
  • Low quiescent current: 1.5mA (30MHz BW)
  • Wide supply range: ±2.25V to ±18V
  • Internal current limit
  • Thermal shutdown protection
  • Packages:
    • 5-pin SOIC
    • 5-pin TO-220
    • 5-pin TO-263 surface-mount
  • A newer version of this device is now available: BUF634A
  • High output current: 250mA
  • Slew rate: 2000V/µs
  • Pin-selected bandwidth: 30MHz to 180MHz
  • Low quiescent current: 1.5mA (30MHz BW)
  • Wide supply range: ±2.25V to ±18V
  • Internal current limit
  • Thermal shutdown protection
  • Packages:
    • 5-pin SOIC
    • 5-pin TO-220
    • 5-pin 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 1.5mA quiescent current with 250mA output, 2000V/µs slew rate, and 30MHz bandwidth. Bandwidth can be adjusted from 30MHz to 180MHz by connecting a resistor between V– and the BW pin.

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

The BUF634 is available in a variety of packages to meet mechanical and power-dissipation requirements. Types include SOIC‑8 surface-mount, 5‑lead TO‑220, and a 5‑lead TO‑263 (DDPAK) surface-mount plastic power packages.

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 1.5mA quiescent current with 250mA output, 2000V/µs slew rate, and 30MHz bandwidth. Bandwidth can be adjusted from 30MHz to 180MHz by connecting a resistor between V– and the BW pin.

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

The BUF634 is available in a variety of packages to meet mechanical and power-dissipation requirements. Types include SOIC‑8 surface-mount, 5‑lead TO‑220, and a 5‑lead TO‑263 (DDPAK) surface-mount plastic power packages.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet BUF634 250mA High-Speed Buffer datasheet (Rev. C) PDF | HTML Mar 1, 2024
Application note BUF634A and BUF634 Thermal Performance Comparison PDF | HTML Oct 18, 2021
Application brief Optimizing LCR Meter Front-End Design for Accurate Impedance Measurements PDF | HTML Jan 20, 2021
E-book The Signal e-book: A compendium of blog posts on op amp design topics PDF | HTML Mar 28, 2017
Application note Combining an Amplifier with the BUF634 Oct 2, 2000
Application note Add Current Limit to the BUF634 Sep 27, 2000
Application note Power Amplifier Stress and Power Handling Limitations Sep 27, 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 (...)
User guide: PDF | HTML
Supported products & hardware
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Simulation model

BUF634 PSpice Model (Rev. B)

SBOM003B.ZIP (62 KB) - PSpice model
Supported products & hardware
Simulation model

BUF634 TINA-TI Reference Design (Rev. C)

SBOC135C.TSC (405 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

BUF634 TINA-TI Spice Model (Rev. B)

SBOM204B.ZIP (10 KB) - TINA-TI Spice model
Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
TO-220 (KC) 5 Ultra Librarian
SOIC (D) 8 Ultra Librarian
TO-263 (KTT) 5 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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