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opa551ua

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by Ray

Texas Instruments Operational Amplifier, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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OPA551UA

Texas Instruments · Operational Amplifier · SOIC-8

OPA551UA from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 V- power_in Negative (lowest) power supply. Operating supply range ±4 V to ±30 V (8 V to 60 V between rails). Pins 1, 4, and 5 are internally connected for improved thermal performance; pin 4 must carry the primary V- supply current, pins 1 and 5 should be connected to a thermal mass rather than used as feedthroughs to V-.
2 -IN input Inverting op-amp input. Common-mode range (V-)+2.5 V to (V+)-2.5 V; input bias current ±20 pA typ (±100 pA max). Internal clamp diodes protect against voltages beyond the rails; external input current must be limited to 5 mA.
3 +IN input Noninverting op-amp input. Common-mode range (V-)+2.5 V to (V+)-2.5 V; input bias current ±20 pA typ. Internal clamp diodes protect against voltages beyond the rails; external input current must be limited to 5 mA.
4 V- power_in Negative (lowest) power supply - primary current carrier for V-. Operating supply range ±4 V to ±30 V (8 V to 60 V total between rails). Bypass with 0.1 µF (and 10 µF) capacitor near the pin.
5 V- power_in Negative (lowest) power supply. Internally tied to pins 1 and 4 for improved thermal performance. Should be connected to a thermal mass rather than used as a PCB feedthrough for V-.
6 Out output Amplifier output. Swings to within ~2 V of the rails at 10 mA and ~3 V of the rails at 200 mA. Continuous output current up to ±200 mA; short-circuit current limited to approximately ±380 mA. Stable driving capacitive loads (see Figure 19 for allowed CL vs. gain).
7 V+ power_in Positive (highest) power supply. Operating supply range ±4 V to ±30 V (8 V to 60 V total between rails). Quiescent current ±7 mA typ (±8.5 mA max). Bypass with 0.1 µF (and 10 µF) capacitor near the pin.
8 Flag output Thermal-shutdown indicator (current-source output). Sources ~50 nA (1 µA max) during normal operation and 80-160 µA (120 µA typ) when the die exceeds ~160 °C and enters thermal shutdown (resets at ~140 °C). Compliance range V- to (V+)-1.5 V; an external pull-down resistor converts the current to a logic-level signal.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-8
Category Op-amp/Cmp
Pins 8

Ordering variants

  • OPA551UA
  • OPA551UA/2K5
  • OPA551UAE4
  • OPA551UAPAG4
  • OPA551UAFA/500
  • OPA551UAFA/500G3
  • OPA551UAFAKTWT
  • OPA551UAFAKTWTG3

CAD (KiCad official)

  • Symbol: OPA551UA
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (None pp, sha256 bc4b2856546ba466, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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