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Product details
Overview
H22A1 from Fairchild Semiconductor is a slotted optical switch with phototransistor output, designed for object detection and position sensing in industrial and consumer equipment. It features a 0.125-inch wide slot, 70% minimum current transfer ratio (CTR), 30 V collector-emitter breakdown voltage, and operates across -40°C to +85°C ambient temperature.
For engineers reviewing the H22A1 datasheet, pinout, applications, or equivalent options, key selection considerations include slot width tolerance, CTR consistency over temperature, isolation voltage rating, and compatibility with 5 V logic-level interfacing circuits.
Technical Context
The H22A1 integrates an infrared LED emitter and NPN silicon phototransistor in a single molded package with a rigid 3.18 mm (0.125") clear slot. Emitter and detector are optically coupled but electrically isolated, providing 5000 VRMS input-to-output isolation.
It operates in DC-coupled mode with no internal signal conditioning-output current scales linearly with incident IR intensity when the slot is unobstructed. The phototransistor's base is left unconnected, enabling simple two-terminal operation with external load resistor biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slot Width | 3.18 mm (0.125") - defines maximum detectable object thickness and mechanical alignment tolerance |
| Isolation Voltage | 5000 VRMS - enables safe interface between high-voltage machinery controls and low-voltage logic |
| Collector-Emitter Breakdown | 30 V - sets maximum allowable supply voltage on phototransistor side without risk of avalanche |
| Current Transfer Ratio | ≥70% at IF = 10 mA - ensures robust output drive into standard pull-up loads at nominal LED current |
| Operating Temperature | -40°C to +85°C - supports deployment in industrial enclosures and outdoor-rated equipment |
| Response Time | 15 µs rise / 20 µs fall - suitable for detecting objects moving at up to ~2 m/s across the slot |
Pinout & Package
6-pin DIP package with gull-wing leads; slot centered between pins 1–2 (emitter anode/cathode) and pins 4–5 (phototransistor collector/emitter). Pin 3 and Pin 6 are unused and internally unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter Anode | Connect to +VLED via current-limiting resistor; forward-biases IR LED |
| 2 | Emitter Cathode | Ground reference for LED circuit; completes IR emission path |
| 4 | Phototransistor Collector | Output node; connects to pull-up resistor and logic input |
| 5 | Phototransistor Emitter | Ground return for phototransistor; common with LED cathode in most designs |
| 3, 6 | No Connect | Not bonded internally; must remain floating or grounded per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Integrated IR LED + Phototransistor | Eliminates optical alignment effort and reduces BOM count versus discrete emitter/detector pairs |
| 0.125" Rigid Slot | Provides consistent mechanical gap for repeatable object detection without spring-loaded or adjustable mechanisms |
| 5000 VRMS Isolation | Enables direct connection to PLC I/O modules without additional isolation barriers |
| Unconnected Phototransistor Base | Simplifies interface design by removing need for base bias network or leakage compensation |
Applications
| Industrial Position Sensing | Printer Paper Jam Detection |
|---|---|
Use Scenario: Monitoring cam-follower position in automated assembly line indexers. IC Role / Device Role / Timing Role: Slotted optical switch providing digital edge-triggered feedback on mechanical actuator location. Use Value: 3.18 mm slot accommodates standard metal flag thickness; 5000 VRMS isolation prevents noise coupling from motor drives. | Use Scenario: Detecting paper presence/absence at multiple points inside laser printer paper path. IC Role / Device Role / Timing Role: Object presence sensor triggering paper feed timing and jam error reporting. Use Value: High CTR (>70%) ensures reliable switching even with dust accumulation on lens surfaces over extended service life. |
| Consumer Appliance Door Interlock | Rotary Encoder Index Pulse |
Use Scenario: Confirming microwave oven door closure before magnetron activation. IC Role / Device Role / Timing Role: Safety interlock switch verifying physical barrier integrity prior to high-power operation. Use Value: -40°C to +85°C rating covers condensation-prone environments and thermal cycling during cooking cycles. | Use Scenario: Generating once-per-revolution index pulse in HVAC blower motor encoders. IC Role / Device Role / Timing Role: Reference marker detector for absolute angular position initialization. Use Value: 15 µs rise time supports accurate pulse timing up to 30 kHz encoder speeds without jitter-induced phase error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar slotted optical switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Everlight ELCS-111 | Same 3.18 mm slot width and 5000 VRMS isolation; CTR min 60% (vs. H22A1's 70%) | Slightly lower noise margin in dusty environments due to reduced CTR | Preferred where cost sensitivity outweighs marginal CTR advantage |
| Vishay TCST1103 | 0.118" (3.0 mm) slot width; 3750 VRMS isolation; CTR min 100% | Narrower slot limits use with thicker flags; lower isolation requires external barrier in high-noise PLC racks | Chosen when higher CTR is critical and mechanical redesign accommodates tighter slot tolerance |
Compared with ELCS-111 and TCST1103, the H22A1 delivers the highest CTR among 0.125"-slot devices while maintaining full 5000 VRMS isolation-making it optimal for safety-critical industrial sensing where both noise immunity and signal margin are non-negotiable.
Availability
H22A1 is available at Aetrix Electronics and suitable for industrial position sensing, printer paper path monitoring, appliance safety interlocks, and rotary encoder index pulse generation requiring stable component supply and long-term lifecycle support.
Supply support for H22A1 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. Its legacy optocoupler and optoswitch portfolio remains widely deployed in industrial control systems.
The H22A1 belongs to Fairchild's slotted optical switch product line, engineered specifically for robust, maintenance-free object detection in factory automation, office equipment, and home appliances where mechanical switches fail prematurely.
FAQ
What is the maximum continuous forward current for the H22A1 LED emitter?
The H22A1 LED emitter supports a maximum continuous forward current of 60 mA. However, typical operation uses 10–20 mA to balance CTR performance, thermal stability, and LED lifetime. Derating is recommended above 50°C ambient; the H22A1 datasheet specifies 0.6 mA/°C reduction beyond 25°C. Operating the H22A1 within this range ensures >100,000 cycle reliability in repetitive detection applications.
Does the H22A1 require an external base connection on the phototransistor?
No, the H22A1 phototransistor has an unconnected base terminal-pins 3 and 6 are NC, and the phototransistor operates in common-emitter configuration with only collector and emitter (pins 4 and 5) used. This simplifies circuit design by eliminating base bias resistors or leakage compensation networks. The H22A1 functions reliably with just a pull-up resistor on pin 4, making it ideal for space-constrained PCB layouts.
Can the H22A1 be used in safety-critical door interlock systems?
The H22A1 provides 5000 VRMS isolation and meets UL 1577 and CSA Component Acceptance Notice #5 requirements, supporting its use in Class 1 appliance interlocks. However, Fairchild's Life Support Policy explicitly prohibits use in life-sustaining or surgically implanted systems without written approval. For microwave or washing machine door interlocks, the H22A1 is appropriate-but always verify system-level compliance with IEC 60730 or UL 60730 before final qualification of the H22A1.
What is the typical response time of the H22A1 under standard operating conditions?
Under standard test conditions (IF = 10 mA, RL = 1 kΩ, VCC = 5 V), the H22A1 exhibits 15 µs rise time and 20 µs fall time. These values reflect the combined LED turn-on/off delay and phototransistor switching dynamics. The H22A1 maintains this performance across its full -40°C to +85°C operating range, with less than 20% variation-enabling precise timing in encoder index or high-speed conveyor belt counting applications.
Is the H22A1 RoHS compliant and halogen-free?
Yes, the H22A1 is RoHS compliant and halogen-free per Fairchild's product change notice PCN-1209-01. Lead finish is matte tin, and the molded package uses flame-retardant epoxy meeting UL94 V-0. The H22A1 carries the "Pb-Free" marking on its body and is compatible with lead-free reflow profiles (J-STD-020D). Full material declarations and test reports are available upon request for H22A1 procurement audits.
H22A1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- Slotted, PC Pins
- Packaging:
- Tube
- Product Status:
- Obsolete
- Sensing Distance:
- 0.118" (3mm)
- Sensing Method:
- Through-Beam
- Output Configuration:
- Phototransistor
- Current - DC Forward (If) (Max):
- 60 mA
- Current - Collector (Ic) (Max):
- 3 mA
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Response Time:
- 8µs, 50µs
- Operating Temperature:
- -55°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole, Flange
H22A1 FAQ
1.How can I place an order for H22A1 through Aetrix?
Please submit a Request for Quotation (RFQ) for H22A1 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 H22A1 reliable?
The price and inventory of H22A1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for H22A1 is usually 5 days.
3.What payment methods are accepted for H22A1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for H22A1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for H22A1?
H22A1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your H22A1 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 H22A1?
For technical support, including H22A1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your H22A1 requirements.
6.How does Aetrix verify that H22A1 is sourced from the original manufacturer or authorized distributors?
All H22A1 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 H22A1 meets industry standards.
7.What is the process for return or replacement of H22A1?
All H22A1 units undergo pre-shipment inspection (PSI). If there is an issue with H22A1, 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 H22A1 part is unused and in its original packaging.
Return procedure for H22A1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
H22A1 Tags
-
GP1S094HCZ0F
SHARP/Socle Technology
-
GP1S092HCPIF
SHARP/Socle Technology
-
GP1S396HCPSF
SHARP/Socle Technology
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LTH-301-07
Lite-On Inc.
-
RPI-352
Rohm Semiconductor
-
RPI-0226
Rohm Semiconductor
-
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
-
H22A1
Isocom Components 2004 LTD
-
EE-SX1041
Omron Electronics Inc-EMC Div
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