ALD2321BSCL

Overview

The ALD2321BSCL is a monolithic dual precision voltage comparator utilizing advanced silicon gate CMOS technology and EPAD® electronic-trimming. It features ultra-low offset voltage (max 0.5mV) and input bias currents (typ 0.01pA). Operating on a single +4V to +10V supply, it provides separate push-pull outputs with high sink current capability up to 50mA. The device operates within a temperature range of 0°C to +70°C and is housed in a 16-pin SOIC package.

Feature Summary

• Ultra-low offset voltage achieved through factory e-trim technology for precise low-level signal detection
• Dual complementary output drivers allowing flexible configuration as open drain, push-pull, or wired-OR
• High-speed response time suitable for small overdrive voltages and TTL-compatible inputs
• Low supply current consumption optimized for battery-operated instruments

Applications

• Dual limit window comparators
• Power supply voltage monitoring
• Photo-detector sensor circuits
• Relay or LED drivers
• Battery operated instruments

Procurement Notes

Verify the specific suffix 'SCL' corresponds to the 16-pin Small Outline Plastic DIP (SOIC) package variant when ordering. Confirm that the 'B' grade meets the required maximum offset voltage specifications for your application. Ensure the operating environment remains within the specified 0°C to +70°C range. Check for lead-free compliance requirements if applicable to your manufacturing standards.

Selection Notes

Select this component when high input impedance and minimal offset drift are critical for detecting signals near ground potential. The dual complementary outputs provide design flexibility for driving various loads without external buffering. Consider the ALD2321ASCL if tighter offset voltage tolerances are required, or the ALD2321SCL for standard performance levels. Evaluate thermal dissipation needs based on the load current drawn from the sink output pins.

Part Context

This part belongs to the ALD2321 family of ultra-low Vos EPAD® dual CMOS analog voltage comparators manufactured by Advanced Linear Devices. The family includes variants with different trimming grades (A, B, standard) and packaging options including PDIP and CERDIP. The ALD2321 series is designed to eliminate the need for input amplification stages in precision sensing applications.

Replacement Considerations

ALD2321ASCL

FAQ

How does the ALD2321BSCL handle input signals at ground potential?

The input voltage range includes ground, making it ideal for single-supply (+5V) systems where signals at or near 0V must be detected reliably without requiring negative supply rails.

What is the function of the VE pins on the ALD2321BSCL?

The VE pins (VE11, VE12, VE21, VE22) are used for factory electronic trimming of the offset voltage. They should normally be left unconnected but can be utilized for positive/negative feedback to introduce hysteresis if necessary.