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LM321SN3T1G

onsemi single-channel 1MHz op-amp, 3V~32V supply, 430uA Iq, SOT-23-5

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Manufacturer Part：

LM321SN3T1G

Package：

SOT-23-5 (SN suffix)

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Description

Product Overview

The LM321SN3T1G from onsemi is a single-channel, low-power operational amplifier in a tiny SOT-23-5 package. Supporting a wide supply range of 3V to 32V (single supply) or plus/minus 1.5V to plus/minus 16V (dual supply), this 1MHz bandwidth amplifier draws only 430uA typical supply current, making it an excellent choice for battery-powered and space-constrained analog signal conditioning.

Key Specifications

Channels 1
Supply Voltage 3V ~ 32V (single) or plus/minus 1.5V ~ plus/minus 16V
Gain-Bandwidth Product 1MHz
Slew Rate 0.5V/us
Input Offset Voltage plus/minus 7mV (max, 25C)
Supply Current 430uA (typical, 5V)
CMRR 70dB (typical)
Operating Temperature -40C ~ +85C
Package SOT-23-5

Features

  • Wide single-supply operation from 3V to 32V
  • Low supply current of 430uA typical
  • 1MHz gain-bandwidth product for general-purpose use
  • ESD protection: HBM 2000V, CDM 1000V
  • Directly replaces LM358/LM324 single-channel sections in space-constrained designs
  • Output swings to ground in single-supply applications

Applications

  • Battery-powered sensor signal conditioning
  • Active filters and low-frequency amplifiers
  • Portable medical instrument front-ends
  • Industrial transducer interface circuits
  • Single-supply audio pre-amplification

The LM321SN3T1G is a general-purpose single-channel operational amplifier manufactured by onsemi in a compact SOT-23-5 surface-mount package. It operates over a wide supply voltage range from 3V to 32V in single-supply configurations or plus/minus 1.5V to plus/minus 16V in dual-supply configurations. With a gain-bandwidth product of 1MHz and a typical slew rate of 0.5V/us, the LM321 is well-suited for low-frequency signal conditioning tasks. The device draws a typical supply current of only 430uA at 5V, making it ideal for battery-powered and portable applications. Its input common-mode range includes ground, and the output can swing to within 1.5V of the positive rail, providing flexibility in single-supply designs.

The LM321SN3T1G uses a classic two-stage CMOS/bipolar operational amplifier architecture. The input stage consists of a differential pair that amplifies the voltage difference between the inverting and non-inverting inputs. The gain stage provides the majority of the open-loop voltage gain (typically 50V/mV). The output stage is a class-AB push-pull buffer capable of driving loads to within 1.5V of the supply rails. Frequency compensation is internal, providing stable operation for unity-gain and higher gain configurations. The device maintains a high power supply rejection ratio (PSRR) of 100dB typical, ensuring that power supply noise does not significantly affect the output signal.

Pin Name Function
1 IN+ Non-inverting Input
2 V-/GND Negative Supply / Ground
3 IN- Inverting Input
4 VOUT Output
5 V+ Positive Supply
  • Sensor signal conditioning: Amplify low-level outputs from temperature, pressure, or light sensors in battery-operated instrumentation
  • Active filters: Implement low-pass, high-pass, or band-pass filters for audio or instrumentation signal paths
  • Portable medical devices: Serve as a front-end amplifier for ECG, EMG, or pulse oximetry sensors with low power consumption
  • Industrial transducer interfaces: Convert 4-20mA current loop signals to voltage for ADC input
  • Audio pre-amplification: Boost microphone or line-level signals in single-supply consumer audio circuits
Model Brand GBW Iq Package
LMV321SN3T1G onsemi 1MHz 130uA SOT-23-5
MCP6001T-I/SN Microchip 1MHz 100uA SOT-23-5
TLV313SIDBVR TI 1MHz 150uA SOT-23-5
TS321IDBVR ST 1MHz 300uA SOT-23-5
NCV321SN3T1G onsemi 1MHz 430uA SOT-23-5
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