BUF634A 210-MHz, 250-mA high-speed buffer | TI.com

BUF634A (ACTIVE) 210-MHz, 250-mA high-speed buffer



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 an upgrade to the BUF634 with 16% higher bandwidth and a higher slew rate at 43% reduced supply current. See the Device Comparison Table for a selection of unity-gain, open-loop buffers from Texas Instruments. This device is rated to function over the extended industrial temperature range of –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 SOIC-8 package
  • Extended temperature operation:
    –40°C to +125°C

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Compare all products in High-speed op amps (GBW>=50MHz) Email Download to Excel
Part number Order Architecture Number of channels (#) Total supply voltage (Min) (+5V=5, +/-5V=10) Total supply voltage (Max) (+5V=5, +/-5V=10) BW @ Acl (MHz) Acl, min spec gain (V/V) Slew rate (Typ) (V/us) Vn at flatband (Typ) (nV/rtHz) Vn at 1 kHz (Typ) (nV/rtHz) Iq per channel (Typ) (mA) Vos (offset voltage @ 25 C) (Max) (mV) Rail-to-rail Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Input bias current (Max) (pA) Offset drift (Typ) (uV/C) GBW (Typ) (MHz) Output current (Typ) (mA) 2nd harmonic (dBc) 3rd harmonic (dBc) @ MHz
BUF634A Order now Bipolar     1     4.5     36     210     1     3750     3.4     3.4     8.5     60     No         Catalog     -40 to 125     SOIC | 8     8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)     1600000       240     250     -77     -79     0.02    
BUF602 Order now Current FB     1     2.8     12.6     1000     1     8000     4.8     5.9       30     No       Catalog     -45 to 85     SOIC | 8
SOT-23 | 5    
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
5SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 5)    
  125     1000     60     76     98     5