The PT12-21C/TR8 from Everlight Electronics is a silicon phototransistor supplied in a miniature surface-mount package with a water-clear epoxy spherical top-view lens. It is spectrally matched to infrared-emitting diodes and is designed to provide fast response, high photosensitivity, and low junction capacitance for infrared sensing applications.
The device provides a broad 400nm to 1100nm spectral response range with a typical 890nm peak-sensitivity wavelength. At VCE=5V and an irradiance of 1mW/cm², on-state collector current is specified at 0.30mA minimum and 1.14mA typical.
Electrical ratings include a 30V collector-emitter voltage, 5V emitter-collector voltage, and 50mA maximum collector current. Maximum power dissipation is 75mW at 25°C free-air temperature, while maximum collector-emitter saturation voltage is 0.4V.
With no incident light and VCE=20V, maximum collector dark current is only 100nA, supporting reliable low-light and infrared detection. Everlight also highlights fast response time, high photosensitivity, and small junction capacitance as key device features.
The PT12-21C/TR8 is a two-terminal SMD phototransistor with separate collector and emitter connections. The official mechanical drawing specifies an approximate device length of 3.0 ±0.2mm and overall height of 2.0 ±0.2mm.
The operating temperature range is -25°C to +85°C, while storage temperature is -40°C to +85°C. Maximum soldering temperature is 260°C for up to 5 seconds. The device is Pb-free and compliant with RoHS, EU REACH, and Everlight’s halogen-free requirements.
The TR8 option is packaged on 8mm tape in a 7-inch reel, with 2000 devices per reel according to the official datasheet. Typical applications include miniature switches, counters and sorters, position sensors, and general infrared sensing systems.
Key Specifications:
- Brand: Everlight Electronics
- Part Number: PT12-21C/TR8
- Product Type: Infrared Phototransistor
- Chip Material: Silicon
- Mounting Type: SMD / SMT
- Lens Color: Water Clear
- Lens Type: Spherical Top View
- Spectral Response: 400nm to 1100nm
- Peak Sensitivity Wavelength: 890nm Typ
- Collector-Emitter Voltage VCEO: 30V
- Emitter-Collector Voltage VECO: 5V
- Maximum Collector Current: 50mA
- Maximum Power Dissipation: 75mW
- Maximum VCE(sat): 0.4V
- Maximum Dark Current: 100nA @ VCE=20V
- On-State Collector Current: 0.30mA Min
- Typical On-State Collector Current: 1.14mA
- IC(on) Test Condition: VCE=5V, Ee=1mW/cm²
- Approximate Length: 3.0 ±0.2mm
- Approximate Height: 2.0 ±0.2mm
- Terminals: Collector / Emitter
- Operating Temperature: -25°C to +85°C
- Storage Temperature: -40°C to +85°C
- Maximum Soldering Temperature: 260°C, ≤5s
- Packaging: 8mm Tape / 7-Inch Reel
- Reel Quantity: 2000 pcs
- Pb-Free: Yes
- RoHS Compliant: Yes
- EU REACH Compliant: Yes
- Halogen-Free: Yes
- Current Availability: Exact part remains listed on Everlight’s official website.
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