TSUS5401 Equivalent & Substitute Parts

Part Overview

The TSUS5401 is an infrared (IR) emitter operating at 950nm wavelength, designed for through-hole radial mounting applications. Manufactured by Vishay Semiconductor Opto Division, this component is rated for 150mA maximum forward current with a typical forward voltage of 2.2V and radiant intensity of 10mW/sr @ 100mA. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

TSUS5401

Vishay Semiconductor Opto DivisionIn Stock: 4556TSUS5401 Datasheet

Current PartRFQ

BIR-BM5331

American Bright Optoelectronics CorporationIn Stock: 17593BIR-BM5331 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TSUS5401 is determined by the following critical parameters:

• Mounting Type & Package: Through-hole radial configuration is mandatory for mechanical compatibility
• Operating Temperature Range: -40°C ~ 85°C establishes the thermal operating envelope
• Wavelength Compatibility: IR emitters in the 940nm–950nm range are functionally interchangeable for most applications
• Current & Voltage Ratings: Forward current and voltage must not exceed circuit design limits
• Radiant Intensity: Output power characteristics must meet or exceed application requirements
• Compliance: RoHS3 compliance and MSL rating ensure regulatory and environmental compatibility

The BIR-BM5331 qualifies as a substitute based on matching mounting type (through-hole radial), operating temperature range (-40°C ~ 85°C), wavelength proximity (940nm vs. 950nm), and compliance certifications (RoHS3, MSL 1).

Parameter Comparison

Engineering Selection Recommendations

The BIR-BM5331 is an active product with current manufacturing support, making it suitable for applications requiring long-term component availability. Both parts maintain identical operating temperature ranges (-40°C ~ 85°C) and comply with RoHS3 and MSL 1 specifications, ensuring regulatory and environmental compatibility.

Key differences in electrical characteristics must be evaluated against circuit design requirements:

• The BIR-BM5331 operates at lower forward current (100mA maximum vs. 150mA) and lower forward voltage (1.25V typical vs. 2.2V), requiring circuit redesign if the original design depends on the higher current capability of the TSUS5401
• Wavelength difference (940nm vs. 950nm) is within the near-infrared spectrum and functionally compatible for most receiver applications
• Viewing angle reduction (35° vs. 44°) narrows the emission cone and may impact optical system performance in wide-angle applications

Selection of the BIR-BM5331 is appropriate for new designs and legacy system support where circuit parameters can accommodate the lower current and voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can the BIR-BM5331 directly replace the TSUS5401 without circuit modification?

A: Direct replacement depends on circuit design. If the original circuit is designed for the TSUS5401's 150mA maximum current and 2.2V forward voltage, the BIR-BM5331's lower ratings (100mA, 1.25V) may require current-limiting resistor adjustment or circuit redesign. Wavelength compatibility (940nm vs. 950nm) is functionally acceptable for most IR receiver applications.

Q: What is the significance of the 44° vs. 35° viewing angle difference?

A: Viewing angle defines the cone of IR emission. The TSUS5401's wider 44° angle provides broader spatial coverage, while the BIR-BM5331's 35° angle concentrates emission in a narrower cone. Application-specific optical geometry must be evaluated to ensure adequate receiver coverage.

Q: Are both parts compliant with current regulatory standards?

A: Both the TSUS5401 and BIR-BM5331 are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, meeting current environmental and regulatory requirements for electronic component manufacturing and deployment.

Q: Why is the TSUS5401 listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The BIR-BM5331, with active product status, provides ongoing manufacturing support and supply chain availability for equivalent functionality.

Q: How do radiant intensity specifications compare between the two parts?

A: The TSUS5401 specifies 10mW/sr @ 100mA, while the BIR-BM5331 specifies 9.9mW/sr @ 50mA. Direct comparison requires evaluation at equivalent current levels; the BIR-BM5331's measurement at lower current reflects its lower maximum current rating. Application requirements for optical output power must be verified against actual operating conditions.