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PT4800
Sharp Microelectronics
SENSOR PHOTO 800NM SIDE VIEW RAD
34972 Pcs New Original In Stock
Phototransistors 800nm Side View Radial
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Minimum 1
5.0 / 5.0
- (200 Ratings)
PT4800
Product Overview
7928482
DiGi Electronics Part Number
PT4800-DGManufacturer
Sharp Microelectronics
PT4800
Description
SENSOR PHOTO 800NM SIDE VIEW RADInventory
34972 Pcs New Original In Stock
Phototransistors 800nm Side View Radial
Quantity
Minimum 1
Minimum 1
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PT4800 Technical Specifications
Category
Optical Sensors, Phototransistors
Packaging
-
Series
-
Product Status
Obsolete
Voltage - Collector Emitter Breakdown (Max)
35 V
Current - Collector (Ic) (Max)
20 mA
Current - Dark (Id) (Max)
100 nA
Wavelength
800nm
Viewing Angle
70°
Power - Max
75 mW
Mounting Type
Through Hole
Orientation
Side View
Operating Temperature
-25°C ~ 85°C (TA)
Package / Case
Radial
Datasheet & Documents
Datasheets
Download PT4800 Product Specification (PDF)
Design Resources
Development Tool Selector
HTML Datasheet
PT4800-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
ECCN
EAR99
HTSUS
8541.49.7080
Additional Information
Other Names
425-1009-5
Standard Package
50
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
Ich bin begeistert von der schnellen Bearbeitungszeit bei DiGi Electronics.
December 02, 2025
Die sichere Verpackung von DiGi Electronics überzeugt mich immer wieder. Meine Bestellungen kommen heile an.
December 02, 2025
Support was helpful and responsive, making my experience hassle-free.
December 02, 2025
DiGi Electronics consistently delivers top-quality products that exceed my expectations.
December 02, 2025
We value their quick response when we need assistance post-purchase.
December 02, 2025
The support team listens carefully and provides tailored solutions to my logistical concerns.
December 02, 2025
Support team was quick to respond and very helpful throughout the process.
December 02, 2025
Their staff’s friendliness makes every interaction smooth and pleasant.
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Frequently Asked Questions (FAQ)
Can the PT4800 be used as a drop-in replacement for the TEFT4300 in a side-view optical encoder design, and what are the key risks in doing so?
The PT4800 is not a direct replacement for the TEFT4300 despite both being 800nm side-view phototransistors. Key risks include differences in spectral responsivity and viewing angle — the PT4800 has a 70° viewing angle compared to the TEFT4300’s 60°, potentially causing misalignment in tight encoder gaps. Additionally, the PT4800 is obsolete and RoHS non-compliant, which may impact long-term supply and regulatory compliance. Designers should verify collector current linearity under pulsed IR LED conditions and confirm mechanical fit, as radial lead spacing may differ. Consider testing with expected signal modulation frequencies, as PT4800 junction capacitance isn’t specified and could limit response speed in high-resolution encoders.
How does the PT4800 perform in low-light industrial sensing applications, and what design techniques can improve signal-to-noise ratio?
In low-light conditions, the PT4800’s 100 nA max dark current helps maintain reasonable signal integrity, but its side-view radial package lacks a lens or shielding, increasing ambient noise susceptibility. To improve SNR, use modulated IR sources (e.g., 38 kHz pulsing) with synchronous detection in the microcontroller. Pair the PT4800 with a transimpedance amplifier using a low-input-bias op-amp (e.g., LMP7721) and guard ring PCB layout to minimize leakage. Ensure optical shielding around the sensor to block stray light, especially since its 70° viewing angle increases sensitivity to off-axis interference. Test at upper temperature limits (-25°C to 85°C) as dark current can double every 10°C rise, degrading low-signal performance.
What are the thermal and electrical derating considerations when operating the PT4800 near its 75 mW power dissipation limit in a high-temperature environment?
When operating the PT4800 near its 75 mW max power in environments above 60°C, thermal derating becomes critical due to the lack of a heatsink in radial through-hole packages. At 85°C ambient, allowable power dissipation may need to be reduced by 30–50% to avoid junction overheating and accelerated aging. Limit collector current to ≤15 mA (below 20 mA max) and ensure VCE remains below 25 V to reduce stress. Use pulsed operation instead of DC bias where possible, and verify temperature rise through board-level testing. Poor PCB copper distribution can create localized hot spots, so include at least 100 mm² of connected copper for thermal conduction.
Is the PT4800 suitable for new designs given its obsolete status and RoHS non-compliance, and what are the long-term reliability risks?
The PT4800 should be avoided in new designs due to its obsolete status and RoHS non-compliance, which pose supply chain and regulatory risks. Long-term reliability is uncertain as spare parts may become unavailable, and non-compliant materials (e.g., leaded solder) may fail under thermal cycling in modern reflow processes. If used in repair or legacy system upgrades, screen each batch for dark current and responsivity variation, as aging or inconsistent storage can affect performance. Consider redesigning with modern alternatives like the Everlight PTR-20-21/UP or Vishay BPW85C, which offer similar side-view packages with RoHS compliance and active production status.
What mechanical and layout considerations are critical when mounting the PT4800 in a side-sensing configuration, and how can misalignment affect performance?
Proper alignment is critical with the PT4800’s side-view radial leads — even 0.5 mm offset can reduce signal strength due to its 70° directional sensitivity. Use a precision mounting hole pattern and consider potting or strain relief to prevent lead flexing during assembly. Orient the emitter (e.g., IR LED) at 90° to the sensor plane and ensure the gap matches the optical path model used during testing. Avoid forcing the leads into non-standard bends as this can crack the epoxy lens or detach bond wires. Include alignment test points in firmware to calibrate output during manufacturing, especially since component tolerances can shift optical axes in mass production.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
PT4800 CAD Models
Sharp Microelectronics PT4800 PCB symbols & footprints
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