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LM7121IM5X

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Texas Instruments Operational Amplifier, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM7121IM5X

Texas Instruments · Operational Amplifier · SOT-23-5

LM7121IM5X from Texas Instruments, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 OUTPUT output Amplifier output; the datasheet states it tolerates momentary short circuits to ground, but prolonged operation in that mode will damage the device if the maximum junction temperature is exceeded.
2 V- power_in Negative supply; for the SOT-23-5 package the datasheet gives a supply range of 5 V to ±5 V and a maximum single-supply operating voltage of 10 V.
3 +IN input Non-inverting input; voltages on the input pins must stay between (V+)−1.4 V and (V−)+1.4 V per the absolute maximum ratings.
4 -IN input Inverting input; the differential input voltage is limited to ±2 V per the absolute maximum ratings.
5 V+ power_in Positive supply; the absolute maximum supply voltage (V+ to V−) is 36 V, and the SOT-23-5 package is rated for a maximum single-supply operating voltage of 10 V.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOT-23-5
Category Operational Amplifier/Comparator
Pins 5

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Input Offset Voltage VOS 1.6 8 mV V+=5V, V-=-5V, VCM=VO=0V, RL>1MΩ; limit at temp extremes 15 6
Input Bias Current IB 5.5 9.5 µA V+=5V, V-=-5V; limit at temp extremes 12 6
Input Offset Current IOS 0.07 4.3 µA V+=5V, V-=-5V; limit at temp extremes 7.0 6
Common Mode Rejection Ratio CMRR 65 75 dB -2V ≤ VCM ≤ 2V; limit at temp extremes 60 6
Positive Power Supply Rejection Ratio +PSRR 65 89 dB 3V ≤ V+ ≤ 5V; limit at temp extremes 60 6
Negative Power Supply Rejection Ratio -PSRR 65 78 dB -5V ≤ V- ≤ -3V; limit at temp extremes 60 6
Input Common Mode Voltage Range (upper) VCM 3 V CMRR ≥ 60 dB, V+=5V, V-=-5V; limit at temp extremes 2.5 7
Input Common Mode Voltage Range (lower) VCM -3 V CMRR ≥ 60 dB, V+=5V, V-=-5V; limit at temp extremes -2.5 7
Large Signal Voltage Gain AV 60 66 dB RL = 2 kΩ, VO = 3 VPP; limit at temp extremes 58 7
Output Swing, positive VO 3 3.62 V RL = 2 kΩ; limit at temp extremes 2.75 7
Output Swing, negative VO -3.62 -3 V RL = 2 kΩ; limit at temp extremes -2.70 7
Output Swing, positive VO 2.5 3.1 V RL = 150 Ω; limit at temp extremes 2.3 7
Output Swing, negative VO -2.8 -2.15 V RL = 150 Ω; limit at temp extremes -2.00 7
Output Short Circuit Current, Sourcing ISC 38 53 mA Sourcing; limit at temp extremes 33 7
Output Short Circuit Current, Sinking ISC 21 29 mA Sinking; limit at temp extremes 19 7
Supply Current IS 5.1 6.4 mA V+=5V, V-=-5V; limit at temp extremes 7.2 7
Input Resistance, Common Mode RIN 6.8 MΩ Common Mode, ±5V 6
Input Resistance, Differential Mode RIN 3.4 MΩ Differential Mode, ±5V 6
Input Capacitance, Common Mode CIN 2.3 pF Common Mode, ±5V 6
Slew Rate SR 520 V/µs AV = +2, RL = 1 kΩ, VO = 6 VPP, ±5V 7
Unity Gain-Bandwidth GBW 105 MHz RL = 1 kΩ, ±5V 7
Phase Margin Øm 74 Deg RL = 1 kΩ, ±5V 7
Bandwidth (-3 dB) f(-3dB) 160 MHz RL = 100 Ω, AV = +1, ±5V 7
Bandwidth (-3 dB) f(-3dB) 50 MHz RL = 100 Ω, AV = +2, ±5V 7
Settling Time ts 65 ns 5 VPP Step, to 0.1%, RL = 500 Ω, ±5V 7
Rise and Fall Time tr, tf 5.8 ns AV = +2, RL = 100 Ω, VO = 0.4 VPP, ±5V 7
Input-Referred Voltage Noise en 17 nV/√Hz f = 10 kHz, ±5V 7
Input-Referred Current Noise in 2 pA/√Hz f = 10 kHz, ±5V 7
Input Common-Mode Voltage Range (upper, +5V supply) VCM 3.5 V CMRR 45 dB, V+=+5V, V-=0V 8
Input Common-Mode Voltage Range (lower, +5V supply) VCM 1.5 V CMRR 45 dB, V+=+5V, V-=0V 8
Input Offset Voltage (+5V supply) VOS 2.4 mV V+=+5V, V-=0V, VCM=VO=V+/2 8
Supply Current (+5V supply) IS 4.8 mA V+=+5V, V-=0V 8
Slew Rate (+5V supply) SR 145 V/µs AV = +2, RL = 1 kΩ to V+/2, VO = 1.8 VPP 8
Unity Gain-Bandwidth (+5V supply) GBW 80 MHz RL = 1k to V+/2 8
Differential Input Voltage -2 2 V Printed as ±2 V 4
Supply Voltage (V+-V−) 36 V 4
Lead Temperature (soldering, 10 sec) 260 °C soldering, 10 sec 4
Junction Temperature TJ 150 °C 4
Storage temperature range Tstg -65 150 °C 4
Electrostatic discharge (HBM) V(ESD) 2000 V Human body model, all pins 4
Operating Temperature Range -40 85 °C 4
Maximum Supply Voltage, SOT-23 single supply 10 V SOT-23 package, single supply 21
Maximum Supply Voltage, SOT-23 dual supplies -5 5 V SOT-23 package, dual supplies, printed ±5 V 21
Junction-to-ambient thermal resistance RθJA 325 °C/W DBV (5) 4

CAD (KiCad official)

  • Symbol: LM7121IM5X
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: lm7121im5x-etched.step / lm7121im5x-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm7121im5x.step / lm7121im5x.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (29 pp, sha256 4c65094ad7c2198e, retrieved 2026-10-31, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF