Vishay Semiconductor Opto Division TEKT5400S-ASZ

Overview

TEKT5400S-ASZ from Vishay Semiconductors is a silicon NPN phototransistor with 4 mA collector light current (I_ca) at 1 mW/cm² irradiance, ±37° angle of half sensitivity, and 850–980 nm spectral bandwidth centered at 920 nm. It features a daylight-blocking filter matched to 950 nm IR emitters, fast 6 μs turn-on/5 μs turn-off times, and is housed in a side-view plastic package (5 × 2.65 × 5 mm) for optocoupler and proximity-sensing applications.

For engineers reviewing the TEKT5400S-ASZ datasheet, TEKT5400S-ASZ pinout, TEKT5400S-ASZ application, or TEKT5400S-ASZ equivalent, key selection criteria include radiant sensitivity matching to 940–950 nm emitters, ambient operating range (−40 to +85 °C), collector-emitter saturation voltage (0.3 V), and thermal resistance (270 K/W) for reliable detector performance in space-constrained industrial controls.

Technical Context

This phototransistor operates as a light-controlled current switch: incident IR radiation generates base current, enabling collector current flow proportional to irradiance. Its spectral response (λ_0.5 = 850–980 nm) and daylight-blocking filter suppress visible-light interference while optimizing coupling with standard 940–950 nm IR LEDs like the TSKS5400S series.

Designed for DC and low-frequency AC detection, it delivers 110 kHz cutoff frequency with 100 Ω load and 5 V supply, supported by low 6 pF collector-emitter capacitance and sub-100 nA dark current (I_CEO) at 20 V - enabling stable operation in noisy or temperature-varying environments.

Key Specifications

Pinout & Package

TEKT5400S-ASZ uses a 2-pin leaded plastic package with side-view lens configuration (5.0 × 2.65 × 5.0 mm). The device has no base terminal access - emitter and collector are the only external terminals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar phototransistor applications.

Compared with TEMT6200FX01 and PT334-6C, TEKT5400S-ASZ provides balanced performance: its integrated daylight filter and ±37° field-of-view offer superior ambient immunity and alignment tolerance in compact side-view configurations, making it preferred for OEM sensor modules requiring minimal external components.

Availability

TEKT5400S-ASZ is available at Aetrix Electronics and suitable for industrial control interfaces, IR proximity sensing, and safety-critical appliance detectors requiring stable component supply and consistent optical performance across temperature.

Supply support for TEKT5400S-ASZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, optoelectronics, MOSFETs, and resistive components for industrial, automotive, and computing markets.

The TEKT5400S-ASZ belongs to Vishay's silicon phototransistor product line, engineered specifically for robust, filter-integrated IR detection in space-constrained and ambient-light-challenged applications.

FAQ

What is the peak wavelength sensitivity of the TEKT5400S-ASZ?

The TEKT5400S-ASZ has a peak wavelength sensitivity (λ_p) of 920 nm, with full spectral bandwidth (λ_0.5) spanning 850–980 nm. This range ensures strong coupling with standard 940 nm and 950 nm infrared emitters while rejecting visible light - a key design feature confirmed in the Vishay datasheet revision 1.6.

Does the TEKT5400S-ASZ require an external daylight-blocking filter?

No, the TEKT5400S-ASZ integrates a daylight-blocking filter matched to 940–950 nm IR emitters. This built-in optical filter suppresses visible-light interference without additional components, simplifying design and improving reliability in ambient-light environments - as specified in the "Features" section of the official Vishay datasheet.

What is the maximum allowable collector current for continuous operation of the TEKT5400S-ASZ?

The TEKT5400S-ASZ supports a maximum continuous collector current (I_C) of 100 mA, with a peak rating of 200 mA for pulse durations ≤10 ms and duty cycle ≤50%. These absolute maximum ratings assume T_amb ≤ 40 °C and proper PCB thermal management to maintain junction temperature below 100 °C.

Can the TEKT5400S-ASZ be used with common 940 nm IR LEDs?

Yes, the TEKT5400S-ASZ is explicitly designed for use with 940 nm IR emitters, including the companion TSKS5400S series. Its spectral bandwidth (850–980 nm) and daylight-blocking filter are optimized for this wavelength, ensuring high signal-to-noise ratio and minimal false triggering - as documented in the Vishay product summary and applications note.

What is the thermal resistance junction-to-ambient (R_thJA) for the TEKT5400S-ASZ?

The TEKT5400S-ASZ has a thermal resistance junction-to-ambient (R_thJA) of 270 K/W when soldered to a PCB per J-STD-051. This value reflects standard mounting conditions and must be considered alongside ambient temperature and power dissipation (≤150 mW) to ensure junction temperature remains within the 100 °C limit.