WTB27-3P2421 Equivalent & Substitute Parts

Part Overview

The WTB27-3P2421 is an optical sensor manufactured by SICK, Inc., designed for photoelectric detection applications with a sensing range of 100mm to 1.6m. This sensor features PNP output with selectable Dark-ON/Light-ON functionality, operates across a 10V to 30V supply voltage range, and is housed in an M12 4-position connector configuration with IP69K ingress protection.

The WTB27-3P2421 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain system continuity, ensure component availability for maintenance and new installations, and support long-term product lifecycle management.

Substiute Parts

WTB27-3P2421

SICK, Inc.In Stock: 961WTB27-3P2421 Datasheet

Current PartRFQ

WTB26I-24161120A00

SICK, Inc.In Stock: 841WTB26I-24161120A00 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the WTB27-3P2421 is determined by compatibility across the following critical parameters:

• Supply Voltage Compatibility: Both the original and substitute must operate within overlapping voltage ranges (10V ~ 30V).
• Output Configuration: The substitute must support PNP output or push-pull output capable of PNP operation to maintain circuit compatibility.
• Sensing Distance: The substitute sensing range must encompass or exceed the original 100mm ~ 1.6m range.
• Connection Interface: M12 connector compatibility ensures mechanical and electrical fit.
• Operating Temperature Range: The substitute must maintain the -40°C ~ 60°C operating window.
• Ingress Protection: The substitute must meet or exceed IP66 minimum for environmental sealing.

The WTB26I-24161120A00 qualifies as a substitute based on these parameters: it maintains 10V ~ 30V supply voltage compatibility, provides push-pull output with selectable NPN/PNP configuration, extends the sensing distance to 10mm ~ 2m (exceeding the original range), uses M12 connector interface, operates across -40°C ~ 60°C, and provides IP66/IP67 ingress protection.

Parameter Comparison

Engineering Selection Recommendations

The WTB26I-24161120A00 is the manufacturer-recommended substitute for the obsolete WTB27-3P2421. Selection of this substitute is supported by the following factors:

• Product Status: The WTB26I-24161120A00 maintains active product status, ensuring ongoing availability and manufacturer support.
• Compliance: The WTB26I-24161120A00 is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.
• Electrical Compatibility: Both parts operate within the same 10V ~ 30V supply voltage range and support PNP output configuration through push-pull capability.
• Environmental Sealing: While the substitute provides IP66/IP67 protection compared to the original IP69K, this represents equivalent or superior environmental protection for most industrial applications.
• Performance Enhancement: The WTB26I-24161120A00 offers faster response time (500µs versus 1.5ms) and extended sensing distance (10mm ~ 2m versus 100mm ~ 1.6m), providing operational advantages in new designs.

Frequently Asked Questions (FAQ)

Q: Can the WTB26I-24161120A00 directly replace the WTB27-3P2421 in existing installations?

A: Yes, provided the application operates within the overlapping electrical and environmental specifications. Both parts support 10V ~ 30V supply voltage, PNP output operation, M12 connector interface, and -40°C ~ 60°C operating temperature. Verify that the extended sensing distance (10mm ~ 2m) and faster response time (500µs) are compatible with your application requirements.

Q: What is the difference in infrared wavelength between these sensors?

A: The WTB27-3P2421 uses 880nm infrared, while the WTB26I-24161120A00 uses 850nm infrared. Both wavelengths are standard for industrial photoelectric sensing and will function with typical reflective and retroreflective targets used in industrial applications.

Q: Does the WTB26I-24161120A00 provide equivalent environmental protection?

A: The WTB26I-24161120A00 provides IP66 and IP67 ingress protection, compared to IP69K on the original part. IP66/IP67 protection is suitable for most industrial environments with water spray and temporary immersion exposure. Applications requiring IP69K-level protection (high-pressure water jets) should be evaluated individually.

Q: Are there connector compatibility considerations?

A: Both parts use M12 connectors. The WTB27-3P2421 specifies M12 4-position, while the WTB26I-24161120A00 uses M12 connector without position specification in the provided data. Verify M12 pin configuration compatibility with your existing wiring harness before installation.

Q: What is the significance of the faster response time in the substitute?

A: The WTB26I-24161120A00 response time of 500µs is faster than the original 1.5ms. This improvement allows the substitute to detect faster-moving objects or provide tighter timing control in high-speed applications. For applications with slower object movement or less stringent timing requirements, both response times are functionally equivalent.