AS333W5-7

Overview

The AS333W5-7 is a micro-power, zero-drift CMOS operational amplifier manufactured by Diodes Incorporated. It features chopping stabilization to eliminate 1/f noise and crossover distortion. The device operates from a single supply of 1.8V to 5.5V or dual supplies of ±0.9V to ±2.5V. Key electrical parameters include an input offset voltage of 8μV (typ), drift of 0.02μV/°C (typ), quiescent current of 17μA (typ), gain bandwidth of 350kHz, and slew rate of 0.12V/μs (typ). It offers rail-to-rail input and output with common-mode voltage extending 100mV beyond the rails. Available in SOT25 packages, it supports operation from -40°C to +125°C.

Feature Summary

• Chopper-stabilized architecture eliminates flicker noise and minimizes input offset voltage drift over temperature and time.
• Rail-to-rail input and output capability with extended common-mode voltage range allowing sensing near ground or system VDD.
• Low power consumption with high precision suitable for battery-powered applications.
• High ESD tolerance providing robust protection against electrostatic discharge events.

Applications

• Battery-powered instruments
• Medical instrumentation
• Low voltage current sensing
• Sensor signal conditioning
• CO detectors and smoke alarms

Procurement Notes

Verify the specific package code W5 corresponds to the SOT25 form factor required for your PCB layout. Confirm that the -7 suffix indicates tape and reel packaging if automated assembly is planned. Ensure the design accounts for the specified operating temperature range of -40°C to +125°C. Check for compliance with RoHS directives if environmental regulations apply to the final product.

Selection Notes

Select this component when low-frequency precision is critical due to its zero-drift technology. It is appropriate for applications requiring minimal quiescent current alongside high accuracy. Consider the 350kHz gain bandwidth when designing for higher frequency signals. Evaluate capacitive load driving requirements, as unity-gain stability is guaranteed up to 200pF without additional isolation components.

Part Context

This part belongs to the AS333 family of micro-power operational amplifiers. The W5 suffix specifically denotes the SOT25 surface-mount package variant. Other variants in the series include the SE package option. The device is designed to replace standard op-amps where low noise and low power are conflicting requirements.

Replacement Considerations

Consult the manufacturer for qualified automotive-grade alternatives if AEC-Q100 compliance is required. Verify pinout compatibility when substituting with other zero-drift amplifiers. Ensure replacement parts support the same supply voltage range and package dimensions.

FAQ

How does the AS333 handle capacitive loads?

The AS333 is unity-gain stable up to 200pF of capacitive load. For heavier loads, an isolation resistor or RC snubber circuit is recommended to maintain stability.

What is the input common-mode voltage range?

The common-mode voltage range extends 100mV beyond the supply rails, allowing the inputs to sense voltages slightly below ground or above VCC.