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

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210-MHz, 250-mA high-speed buffer


Sample Availability

Prototype samples are available (XBUF634AIDRBT). Request Now


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 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.


  • 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

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Part number Order Architecture Number of channels (#) Total supply voltage (Min) (+5V=5, +/-5V=10) Total supply voltage (Max) (+5V=5, +/-5V=10) GBW (Typ) (MHz) 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) Output current (Typ) (mA) 2nd harmonic (dBc) 3rd harmonic (dBc) @ MHz
BUF634A Order now Fixed Gain/Buffer     1     4.5     36     240     210     1     3750     3.4     3.4     8.5     60     No     Adjustable BW/IQ/IOUT     Catalog     -40 to 125     SOIC | 8
SON | 8    
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
8SON: 9 mm2: 3 x 3 (SON | 8)    
1600000     175     250     -77     -79     0.02    
BUF602 Order now Fixed Gain/Buffer     1     2.8     12.6     1000     1000     1     8000     4.8     5.9     5.8     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)    
7000000     125     60     76     98     5