E3T-SR11 Equivalent & Substitute Parts

Part Overview

The Omron E3T-SR11 is a retroreflective optical sensor designed for detection applications requiring adjustable sensing distances from 10mm to 200mm. This sensor operates with NPN open collector output configuration and is compatible with 12V to 24V supply voltages. The E3T-SR11 is classified as obsolete, making identification of suitable substitute components essential for system maintenance, redesign, and procurement planning. Active equivalent models within the E3T series provide direct functional replacement while maintaining core sensing capabilities.

Substiute Parts

E3T-SR11

Omron Automation and SafetyIn Stock: 788E3T-SR11 Datasheet

Current PartRFQ

E3T-SR21 2M

Omron Automation and SafetyIn Stock: 717E3T-SR21 2M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The E3T-SR21 2M qualifies as a direct substitute based on the following critical parameters that define functional equivalence for retroreflective optical sensors:

• Sensing Method: Both employ retroreflective detection
• Sensing Distance: Identical adjustable range of 10mm to 200mm
• Voltage Supply: Both operate within 12V to 24V range
• Output Configuration: Both feature NPN open collector with light-ON logic
• Response Time: Both maintain 1ms response time
• Ingress Protection: Both meet IEC IP67 rating
• Operating Temperature: Both function across -25°C to 55°C range
• Series Compatibility: Both belong to the E3T optical sensor series

Differences in light source wavelength (670nm vs 650nm) and connection method (wire vs cable) do not prevent functional substitution, as these represent packaging and interface variations rather than core sensing capability changes.

Parameter Comparison

Engineering Selection Recommendations

The E3T-SR21 2M is the designated substitute for the obsolete E3T-SR11. Selection of this active component is supported by:

• Product Status: The E3T-SR21 2M maintains active production status, ensuring long-term availability and supply chain continuity
• Regulatory Compliance: The E3T-SR21 2M carries RoHS Compliant certification, meeting current environmental and material restriction standards
• Functional Equivalence: All critical sensing parameters—detection method, distance range, voltage compatibility, output logic, and response characteristics—remain unchanged
• Series Continuity: Both components belong to the established E3T optical sensor series, maintaining design consistency within Omron's product portfolio

The transition from wire connection (E3T-SR11) to cable connection (E3T-SR21 2M) represents a packaging enhancement rather than a functional limitation. The minor wavelength difference (670nm to 650nm) within the red spectrum does not affect retroreflective detection performance for standard applications.

Frequently Asked Questions (FAQ)

Q: Can the E3T-SR21 2M directly replace the E3T-SR11 in existing installations?

A: Yes. Both sensors share identical sensing distance ranges, voltage requirements, output configurations, and response times. The primary consideration is the connection method change from wire to cable, which may require connector adaptation depending on the installation.

Q: Does the light source wavelength difference (670nm vs 650nm) affect sensor performance?

A: No. Both wavelengths operate within the red spectrum and are suitable for retroreflective detection. Retroreflective targets are designed to work across the red spectrum range, making this difference inconsequential for standard applications.

Q: What is the significance of the E3T-SR21 2M being RoHS Compliant while the E3T-SR11 status is unspecified?

A: RoHS Compliance indicates the E3T-SR21 2M meets current environmental standards restricting hazardous substances. This is advantageous for new designs and systems requiring regulatory compliance documentation.

Q: Are there any electrical compatibility concerns when substituting the E3T-SR21 2M for the E3T-SR11?

A: No. Both sensors operate within the same 12V to 24V supply range and feature identical NPN open collector output logic. Existing circuit designs require no electrical modifications.

Q: Why is the E3T-SR11 classified as obsolete?

A: Obsolescence typically reflects discontinuation of production in favor of newer or improved models within the product series. The E3T-SR21 2M represents the active equivalent within the E3T series.

Q: What packaging differences exist between these two sensors?

A: The E3T-SR11 uses wire connection, while the E3T-SR21 2M uses cable connection. The E3T-SR21 2M is supplied in bulk packaging. These represent interface and delivery variations rather than functional differences.