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Product details
Overview
CNY28 from Fairchild Semiconductor is a phototransistor-based optical interrupter switch comprising a GaAs infrared LED emitter and silicon phototransistor in a single 4-pin DIP plastic package with 0.035" apertures and opaque housing. It delivers 0.20 mA collector output current at 20 mA input, 5 µs turn-on/turn-off times, and operates across –55°C to +85°C for tape-sensing and shaft encoder applications.
For engineers reviewing the CNY28 datasheet, pinout, applications, or equivalent options, key selection criteria include aperture size (0.035"), coupled switching performance (IC(ON) ≥ 0.20 mA), saturation voltage (VCE(SAT) ≤ 0.40 V), thermal range (–55°C to +85°C), and DIP-4 mechanical compatibility in optical sensing layouts.
Technical Context
The CNY28 integrates a gallium arsenide infrared LED and silicon NPN phototransistor in a side-facing, gap-coupled configuration with fixed 0.035" optical apertures. Its operation relies on interruption of the IR beam by opaque objects-enabling digital ON/OFF state transitions without electrical contact.
Electrical isolation is achieved via optical coupling with 30 V BVCEO and 5.0 V BVECO ratings. The device supports pulsed operation (PW = 100 µs, PRR = 100 pps) and exhibits normalized output current stability across input currents (5–100 mA) and ambient temperatures (–55°C to +100°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Forward Voltage | VF ≤ 1.7 V at IF = 10 mA - ensures low-drive-voltage compatibility with 3.3 V/5 V logic interfaces |
| Output Collector Current | IC(ON) ≥ 0.20 mA at IF = 20 mA, VCE = 10 V - provides sufficient drive margin for TTL/CMOS input stages |
| Switching Speed | ton/toff ≤ 5 µs - enables reliable detection of mechanical motion up to ~100 kHz in encoder applications |
| Isolation Voltage Rating | Not specified - but optically coupled design inherently provides galvanic isolation between input and output circuits |
| Operating Temperature | –55°C to +85°C - supports deployment in industrial enclosures and automotive under-hood environments |
| Aperture Size | 0.035" (0.89 mm) - defines minimum detectable object thickness and mechanical alignment tolerance in interrupter mounts |
Pinout & Package
Package: 4-pin dual-in-line plastic housing (DIP-4), side-entry optical gap, opaque black housing, 0.433" × 0.249" footprint, 0.103" nominal height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN 1 | Anode | Positive terminal of GaAs IR emitter diode - connects to current-limiting resistor and drive source |
| PIN 2 | Cathode | Negative terminal of IR emitter - referenced to ground or low-side switch node |
| PIN 3 | Collector | Output collector of silicon phototransistor - pulled high via load resistor to define active-HIGH switching logic |
| PIN 4 | Emitter | Phototransistor emitter - typically grounded to complete output current path and enable common-emitter configuration |
Key Features
| Feature | Design Value |
|---|---|
| Opaque black housing | Prevents ambient light interference and ensures reliable signal integrity in unshielded industrial lighting conditions |
| 0.035" precision apertures | Enables consistent mechanical registration with encoder disks, punched tapes, or slotted shafts without custom mounting fixtures |
| Low-cost DIP-4 construction | Supports wave soldering (240°C/5 s, 260°C/10 s) and automated assembly while maintaining < $0.35 unit cost at volume |
| Pro Electron registered | Confirms compliance with European component marking and traceability standards for industrial equipment certification |
Applications
| Rotary Encoder Sensing | Tape/Object Detection |
|---|---|
Use Scenario: Detecting slots on rotating metal or plastic encoder wheels in motor feedback systems. IC Role / Device Role / Timing Role: Optical interrupter providing edge-triggered digital pulses synchronized to shaft rotation. Use Value: 5 µs switching time supports resolution up to 200 kPPS; 0.035" aperture matches standard encoder slot widths (0.8–1.0 mm). |
Use Scenario: Verifying presence/position of punched paper or Mylar tape in document feeders or lab instrumentation. IC Role / Device Role / Timing Role: Non-contact position sensor detecting tape edges or holes via beam interruption. Use Value: Opaque housing eliminates false triggers from room lighting; IC(ON) ≥ 0.20 mA ensures clean logic-level output into 10 kΩ pull-up loads. |
| Industrial Limit Switching | Conveyor Belt Object Counting |
Use Scenario: Replacing mechanical microswitches in packaging machinery where dust, vibration, or wear degrade reliability. IC Role / Device Role / Timing Role: Solid-state limit detector confirming actuator position via flag interruption. Use Value: –55°C to +85°C rating sustains operation in unheated factory floors; 30 V BVCEO withstands inductive load transients. |
Use Scenario: Counting discrete items passing through a conveyor gap using reflective or interruptive sensing. IC Role / Device Role / Timing Role: Digital presence detector generating one pulse per item crossing the optical path. Use Value: Low 100 nA ICEO dark current minimizes false counts during idle periods; DIP-4 footprint allows direct PCB mounting in tight spacing constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar optical interrupter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| H11AA1 | Higher IC(ON) (≥ 0.5 mA), wider operating temperature (–40°C to +100°C), same DIP-4 pinout | Better suited for high-speed or high-temperature environments; requires higher IF drive for full output | Select H11AA1 when >0.3 mA output current or >85°C ambient is required; verify drive capability at IF = 30 mA |
| PC817X | Photocoupler (not interrupter); no integrated aperture; requires external mechanical setup for sensing | Used for signal isolation-not direct replacement for gap-based object detection | Only consider PC817X if redesigning mechanical layout to add custom slits/shields; not drop-in compatible with CNY28 mounting |
Compared with H11AA1 and PC817X, the CNY28 offers purpose-built mechanical integration (0.035" apertures, opaque housing) and optimized low-current sensitivity (IC(ON) ≥ 0.20 mA at IF = 20 mA), making it preferable for cost-sensitive, space-constrained interrupter designs without thermal extremes.
Availability
CNY28 is available at Aetrix Electronics and suitable for rotary encoder sensing, tape/object detection, and industrial limit switching requiring stable component supply and long-term manufacturability.
Supply support for CNY28 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
Fairchild Semiconductor was a U.S.-based analog and power semiconductor manufacturer, acquired by ON Semiconductor in 2016; known for high-reliability optoelectronics and power management ICs.
The CNY28 belongs to Fairchild's photointerrupter product line, designed specifically for non-contact position and motion detection in industrial automation, office equipment, and consumer appliances.
FAQ
What is the maximum continuous forward current rating for the CNY28 emitter?
The CNY28 emitter has a maximum continuous forward current (IF) rating of 50 mA at 25°C. Derating is required above 25°C at 1.67 mW/°C for power dissipation. This rating ensures safe operation with standard current-limiting resistors in 5 V systems - for example, a 220 Ω resistor limits IF to ~18 mA at 5 V, well within specification for typical CNY28 use cases.
Does the CNY28 require external shielding from ambient light?
No - the CNY28 features an opaque black plastic housing that blocks ambient visible and near-IR light, eliminating the need for additional shielding in most indoor industrial environments. Its design inherently rejects stray light, as confirmed by Pro Electron registration and test data showing stable ICEO ≤ 100 nA under ambient illumination per datasheet Figure 4.
Can the CNY28 be used in surface-mount assemblies?
No - the CNY28 is a through-hole DIP-4 device with axial leadform and 0.3" row spacing; it is not designed for SMT reflow or placement. Its mechanical structure, including aperture alignment and housing depth, assumes vertical PCB mounting with leads inserted and wave-soldered. For SMT alternatives, consider the TCST2103 or similar SMD photointerrupters.
What is the minimum detectable object thickness for reliable interruption of the CNY28 beam?
The CNY28's 0.035" (0.89 mm) aperture defines the optical path width; reliable interruption occurs with objects ≥ 0.9 mm thick positioned centrally in the gap. Thinner objects may cause partial beam blockage and inconsistent output - verified by Figure 7 in the datasheet, which shows >90% output current reduction only when obstruction fully bridges the aperture.
Is the CNY28 compliant with RoHS or lead-free soldering requirements?
The original CNY28 (DS300281, 2001) predates RoHS enforcement and uses leaded solder-compatible packaging. While not RoHS-certified, it remains acceptable for industrial applications exempt from RoHS or where legacy compliance is permitted. For RoHS-compliant equivalents, consult ON Semiconductor's updated photointerrupter portfolio post-acquisition.
CNY28 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- Slotted, PC Pins
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Sensing Distance:
- 0.118" (3mm)
- Sensing Method:
- Through-Beam
- Output Configuration:
- Phototransistor
- Current - DC Forward (If) (Max):
- 50 mA
- Current - Collector (Ic) (Max):
- 20 mA
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Response Time:
- 5µs, 5µs
- Operating Temperature:
- -55°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole, Flange
CNY28 FAQ
1.How can I place an order for CNY28 through Aetrix?
Please submit a Request for Quotation (RFQ) for CNY28 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CNY28 reliable?
The price and inventory of CNY28 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CNY28 is usually 5 days.
3.What payment methods are accepted for CNY28?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CNY28 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CNY28?
CNY28 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CNY28 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CNY28?
For technical support, including CNY28 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CNY28 requirements.
6.How does Aetrix verify that CNY28 is sourced from the original manufacturer or authorized distributors?
All CNY28 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CNY28 meets industry standards.
7.What is the process for return or replacement of CNY28?
All CNY28 units undergo pre-shipment inspection (PSI). If there is an issue with CNY28, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CNY28 part is unused and in its original packaging.
Return procedure for CNY28:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CNY28 Tags
-
GP1S094HCZ0F
SHARP/Socle Technology
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GP1S092HCPIF
SHARP/Socle Technology
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GP1S396HCPSF
SHARP/Socle Technology
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LTH-301-07
Lite-On Inc.
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RPI-352
Rohm Semiconductor
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RPI-0226
Rohm Semiconductor
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TCPT1300X01
Vishay Semiconductor Opto Division
-
EE-SX1320
Omron Electronics Inc-EMC Div
-
TCUT1300X01
Vishay Semiconductor Opto Division
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EE-SX1103
Omron Electronics Inc-EMC Div
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H22A1
Isocom Components 2004 LTD
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EE-SX1041
Omron Electronics Inc-EMC Div
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