Vishay Semiconductor Opto Division TEMT7100X01

Overview

TEMT7100X01 from Vishay Semiconductors is a silicon NPN epitaxial planar phototransistor with daylight-blocking filter in a surface-mount 0805 package (2.0 × 1.25 × 0.85 mm), optimized for IR detection at 830–950 nm. It delivers 225–675 μA collector light current at 1 mW/cm² irradiance (λ = 950 nm, V_CE = 5 V), features ±60° half-sensitivity angle, and is AEC-Q101 qualified for automotive sensing.

For engineers reviewing the TEMT7100X01 datasheet, TEMT7100X01 pinout, TEMT7100X01 application, or TEMT7100X01 equivalent, key selection criteria include spectral match to 830–950 nm IR emitters (e.g., VSMB1940X01), daylight rejection capability, high photo sensitivity in miniature SMD form, and compliance with automotive reliability standards.

Technical Context

The TEMT7100X01 operates as a light-controlled NPN transistor with emitter-grounded configuration, where incident IR radiation generates base current to modulate collector current. Its integrated daylight-blocking filter suppresses visible spectrum response while maintaining peak sensitivity at 870 nm and full-width half-maximum bandwidth of 750–1010 nm.

Thermal performance is defined by R_thJA = 270 K/W and operation up to +100 °C junction temperature. Rise/fall times range from ~250 µs to ~1000 µs depending on collector current (100–1500 µA), and dark current remains ≤100 nA at V_CE = 5 V and T_amb = 25 °C.

Key Specifications

Pinout & Package

TEMT7100X01 uses a 2-terminal 0805 surface-mount package with cathode (collector) and anode (emitter) terminals. The device is unidirectional and polarity-sensitive; correct orientation is required for proper biasing in common-emitter or common-collector configurations.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TEMT6000X01 and QSE113, the TEMT7100X01 uniquely combines daylight rejection, AEC-Q101 qualification, and miniature 0805 packaging-making it the only option among the three suitable for production automotive interior sensing where size, reliability, and ambient light immunity are jointly constrained.

Availability

TEMT7100X01 is available at Aetrix Electronics and suitable for automotive occupancy detection, industrial photo interrupters, and consumer miniature optical switches requiring stable component supply, consistent parametric performance across batches, and traceable sourcing for ISO/TS 16949-aligned manufacturing.

Supply support for TEMT7100X01 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 and passive components, specializing in high-reliability optoelectronics, power MOSFETs, and precision resistors for industrial, automotive, and computing markets.

The TEMT7100X01 belongs to Vishay's automotive-qualified phototransistor family designed specifically for IR-based position, presence, and motion sensing in harsh environments-emphasizing spectral selectivity, thermal stability, and SMT manufacturability.

FAQ

What is the peak wavelength sensitivity of the TEMT7100X01?

The TEMT7100X01 has a peak wavelength sensitivity (λ_p) of 870 nm, with a full-width half-maximum spectral bandwidth spanning 750–1010 nm. This matches common infrared emitters such as the VSMB1940X01 and ensures strong signal generation while rejecting visible light. The daylight-blocking filter enhances contrast in ambient-lit conditions, making the TEMT7100X01 especially effective in automotive and consumer applications where background light interference must be minimized.

Is the TEMT7100X01 compatible with lead-free reflow soldering processes?

Yes, the TEMT7100X01 supports lead-free reflow soldering per J-STD-020, with a maximum peak temperature of 260 °C for up to 10 seconds. Its moisture sensitivity level is MSL 3, requiring floor life management: devices must be assembled within 168 hours after opening the moisture barrier bag, under conditions of <30 °C and <60% RH. The TEMT7100X01 datasheet (Rev. 1.3, 30-Jul-2020) provides the full reflow profile in Figure 8.

Does the TEMT7100X01 require an external bias resistor?

Yes, the TEMT7100X01 requires an external collector load resistor to convert its light-dependent collector current into a measurable voltage. In common-emitter configuration, a typical value ranges from 1 kΩ to 10 kΩ depending on supply voltage and desired output swing. The TEMT7100X01 itself contains no internal biasing elements-it functions as a pure phototransistor with two terminals (emitter and collector), and proper biasing is essential for linear or switching operation.

Can the TEMT7100X01 be used in reflective-sensing mode?

Yes, the TEMT7100X01 can be used in reflective-sensing mode when paired with a matched IR emitter (e.g., VSMB1940X01) in close proximity. Its ±60° half-sensitivity angle and daylight-blocking filter make it well-suited for short-range reflectance detection, such as in proximity sensing for automatic faucets or touchless controls. Signal strength depends on target reflectivity and distance; design validation under actual mechanical constraints is recommended for each TEMT7100X01 implementation.

What is the maximum allowable power dissipation for the TEMT7100X01 at 85 °C ambient temperature?

At 85 °C ambient temperature, the maximum allowable power dissipation for the TEMT7100X01 is approximately 55 mW, derived from the derating curve in Figure 1 of the datasheet (R_thJA = 270 K/W). Since P_V = (T_j(max) − T_amb) / R_thJA, with T_j(max) = 100 °C, the calculation yields (100 − 85) / 270 ≈ 0.0556 W. This limits usable collector current under high irradiance or elevated bias-designers should verify thermal margins when operating near absolute maximum ratings.