OP181 Infrared Emitter 940nm Equivalent & Substitute Parts

Part Overview

The OP181 is a 940nm infrared emitter manufactured by TT Electronics/Optek Technology, configured as a 2-SMD Z-Bend surface mount component with 50mA maximum forward current and 1.55V typical forward voltage. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The OP181 operates across the -40°C to 85°C temperature range and meets ROHS3 compliance standards.

Substiute Parts

OP181

TT Electronics/Optek TechnologyIn Stock: 896OP181 Datasheet

Current PartRFQ

QEB363ZR

onsemiIn Stock: 73580QEB363ZR Datasheet

MFR RecommendedRFQ

VSMY2940RG

Vishay Semiconductor Opto DivisionIn Stock: 11928VSMY2940RG Datasheet

MFR RecommendedRFQ

QEB363ZR

onsemiIn Stock: 73580QEB363ZR Datasheet

MFR RecommendedRFQ

VSMY2940RG

Vishay Semiconductor Opto DivisionIn Stock: 11928VSMY2940RG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OP181 is determined by the following critical parameters: wavelength (940nm), package configuration (2-SMD Z-Bend), surface mount compatibility, and forward current rating. The substitute parts QEB363ZR and VSMY2940RG both maintain the 940nm wavelength and 2-SMD Z-Bend package format required for mechanical and optical compatibility.

QEB363ZR (onsemi) operates at 50mA maximum forward current, matching the OP181 current specification exactly, with a forward voltage of 1.6V and 24° viewing angle. This part is active in production status.

VSMY2940RG (Vishay Semiconductor Opto Division) operates at 100mA maximum forward current, exceeding the OP181 specification. This part maintains the 1.55V forward voltage and operates within the same temperature range as the OP181.

Parameter Comparison

Engineering Selection Recommendations

QEB363ZR is the direct current-matched substitute for the OP181, maintaining the 50mA forward current specification. This part is active in production status with extended operating temperature range (-40°C to 100°C) and improved moisture sensitivity rating (MSL 3). QEB363ZR is supplied in Tape & Reel packaging with 73,492 units in stock.

VSMY2940RG provides an alternative with higher current capacity (100mA) and superior moisture sensitivity performance (MSL 2A). This part maintains the OP181 forward voltage specification (1.55V) and operating temperature range. VSMY2940RG is supplied in Cut Tape and Digi-Reel packaging with 11,860 units in stock.

Both substitute parts maintain ROHS3 compliance and the required 2-SMD Z-Bend package configuration. Selection between QEB363ZR and VSMY2940RG depends on circuit current requirements and moisture exposure conditions during storage and assembly.

Frequently Asked Questions (FAQ)

Q: Can QEB363ZR directly replace OP181 in existing designs? A: QEB363ZR maintains identical 50mA forward current and 940nm wavelength specifications. The 0.05V forward voltage increase (1.6V vs 1.55V) and 6° narrower viewing angle (24° vs 30°) must be evaluated within circuit design parameters.

Q: What are the advantages of VSMY2940RG over QEB363ZR? A: VSMY2940RG offers higher current capacity (100mA), superior moisture sensitivity rating (MSL 2A vs MSL 3), and extended shelf life protection. The 100mA rating provides design margin for applications requiring higher optical output.

Q: Are package dimensions identical between OP181 and substitute parts? A: All three parts use 2-SMD Z-Bend package configuration. OP181 specifies bottom entry while QEB363ZR and VSMY2940RG specify standard Z-Bend configuration. PCB layout compatibility must be confirmed with mechanical drawings.

Q: Do substitute parts meet the same compliance standards as OP181? A: Both QEB363ZR and VSMY2940RG are ROHS3 compliant and REACH unaffected, matching OP181 compliance status. Moisture sensitivity levels differ, requiring evaluation based on assembly and storage conditions.

Q: Which substitute part is recommended for new production designs? A: QEB363ZR is recommended for designs requiring exact current matching. VSMY2940RG is recommended for applications benefiting from higher current capacity and improved moisture protection during manufacturing and storage.