TSUS5400 Infrared Emitter Equivalent & Substitute Parts

Part Overview

The TSUS5400 is a Through Hole radial infrared (IR) emitter manufactured by Vishay Semiconductor Opto Division, designed for 950nm wavelength applications with a maximum forward current of 150mA and typical forward voltage of 2.2V. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The radial package configuration and 44° viewing angle define its primary application scope.

Substiute Parts

TSUS5400

Vishay Semiconductor Opto DivisionIn Stock: 12808TSUS5400 Datasheet

Current PartRFQ

LTE-3371T

Lite-On Inc.In Stock: 20131LTE-3371T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TSUS5400 is determined by the following critical parameters:

• Wavelength compatibility: 950nm primary specification; near-infrared alternatives at 940nm fall within acceptable tolerance for most IR detection applications
• Current rating: Maximum forward current of 150mA establishes the upper operational limit; substitutes must support equivalent or higher current capacity
• Forward voltage: Typical 2.2V defines circuit design parameters; substitutes with significantly lower Vf may require circuit recalculation
• Radiant intensity: 7mW/sr @ 100mA establishes optical output performance; substitutes must meet or exceed this specification at comparable measurement conditions
• Viewing angle: 44° defines the spatial radiation pattern; substitutes with similar or wider angles maintain functional compatibility
• Package and mounting: Radial Through Hole configuration is mandatory for mechanical and electrical compatibility
• Environmental compliance: ROHS3 compliance and operating temperature range -40°C ~ 85°C are standard requirements

The LTE-3371T from Lite-On Inc. qualifies as a functional substitute based on matching wavelength class (940nm), compatible radial Through Hole package, equivalent operating temperature range, and ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The LTE-3371T serves as the primary substitute for the obsolete TSUS5400. Selection is supported by:

• Product status alignment: LTE-3371T is Active, ensuring ongoing availability and supply chain continuity
• Regulatory compliance: Both components maintain ROHS3 compliance, satisfying environmental and procurement standards
• Package compatibility: Identical radial Through Hole configuration enables direct mechanical and electrical substitution
• Operating environment: Matching temperature range (-40°C ~ 85°C) maintains thermal performance specifications
• Wavelength proximity: 940nm operation is within the near-infrared spectrum adjacent to 950nm, suitable for IR detection circuits designed for this wavelength class

Design consideration: The LTE-3371T operates at a lower maximum forward current (100mA vs. 150mA) and lower typical forward voltage (1.25V vs. 2.2V). Circuit designs must be verified to operate within these reduced current and voltage parameters.

Frequently Asked Questions (FAQ)

Q: Can the LTE-3371T directly replace the TSUS5400 without circuit modification?

A: The radial Through Hole package enables mechanical substitution. However, the lower maximum forward current (100mA vs. 150mA) and reduced typical forward voltage (1.25V vs. 2.2V) require circuit verification. Current-limiting resistor values and power supply specifications must be recalculated for the LTE-3371T operating parameters.

Q: What is the significance of the 10nm wavelength difference between 950nm and 940nm?

A: Both wavelengths operate in the near-infrared spectrum and are compatible with standard IR detection circuits. The 10nm difference falls within the tolerance of most photodiode and phototransistor receivers designed for this wavelength class. Application-specific receiver sensitivity curves should be consulted for critical designs.

Q: Are there any mechanical differences between the TSUS5400 and LTE-3371T?

A: Both components use radial Through Hole packages. Viewing angles differ slightly (44° vs. 40°), which affects the spatial radiation pattern. The narrower 40° angle of the LTE-3371T may require optical design review in applications requiring the original 44° beam width.

Q: What compliance certifications apply to both components?

A: Both the TSUS5400 and LTE-3371T are ROHS3 compliant and carry Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling.

Q: Why is the TSUS5400 classified as obsolete?

A: Obsolescence reflects the manufacturer's discontinuation of this product line. The LTE-3371T, classified as Active, represents the current-generation equivalent from an alternative manufacturer, ensuring long-term availability and supply chain stability.