Output Latch: Operating Voltage 5-24V DC, Hold Current 10mA max

Q: What is the primary function of an output latch in a comparator array?

To capture and maintain the comparator's output state (high/low) until a reset command is received, preventing transient signal changes from affecting system operations.

Q: How does an electronic output latch differ from a mechanical one?

Electronic latches use semiconductor circuits (flip-flops) for high-speed digital applications, while mechanical latches employ physical catches/springs for environments with electrical noise or where power loss must not affect state retention.

Component Specifications

Definition

An output latch is a critical electromechanical component within comparator arrays that captures and retains binary output signals (high/low states) from comparators. It functions as a memory element that holds the comparator's decision output until explicitly cleared by a reset signal, preventing signal fluctuations from affecting downstream processes. Typically implemented with flip-flop circuits or mechanical locking mechanisms, it ensures stable data transmission in industrial control systems.

Working Principle

The output latch operates on bistable multivibrator principles. When the comparator output triggers the latch's set input, internal gates or mechanical elements change state to capture the signal. This state remains locked regardless of subsequent comparator changes until a reset pulse clears it. In electronic versions, cross-coupled NAND/NOR gates maintain the state; mechanical versions use spring-loaded catches or magnetic holds.

Materials

Housing: Aluminum alloy (e.g., 6061-T6) or engineering plastic (POM); Contacts: Silver-plated copper or beryllium copper; Spring: Stainless steel (302/316); Insulation: Glass-filled nylon or ceramic.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Reset Time	<5ms
Hold Current	10mA max
Response Time	<2ms
Mechanical Life	10^7 cycles
Operating Voltage	5-24V DC
Contact Resistance	<50mΩ
Operating Temperature	-20°C to 85°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 13849-1, DIN EN 60947-5-1

Parent Products

This component is used in the following industrial products

Comparator Array

An integrated circuit component containing multiple comparator circuits arranged in a structured array configuration.

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Engineering Analysis

Risks & Mitigation

Signal drift due to temperature variations
Contact welding from surge currents
Reset failure causing system lockup

FMEA Triads

Trigger: Contact oxidation or contamination
Failure: Increased contact resistance leading to signal loss
Mitigation: Use sealed housings with inert gas filling; specify gold-plated contacts for critical applications

Trigger: Spring fatigue in mechanical latches
Failure: Failure to maintain locked position
Mitigation: Implement redundant spring designs; schedule preventive replacement at 80% of rated cycles

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Omron D4N, Schneider Electric XCK, Siemens 3SU1

Compliance & Inspection

Tolerance

Signal retention time: ±0.5ms; Operating voltage: ±10%

Test Method

IEC 61000-4 series for EMC; MIL-STD-202 for vibration; Continuous cycling test per ISO 13849

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Frequently Asked Questions

What is the primary function of an output latch in a comparator array?