Professional IC Distribution & Technical Solutions

The IR2E27A is an infrared emitter diode manufactured by SHARP. Below are its key specifications, descriptions, and features:

Specifications:

• Type: Infrared Emitting Diode (IRED)
• Wavelength: 940 nm (typical)
• Forward Voltage (Vf): 1.35 V (typical at 20 mA)
• Forward Current (If): 50 mA (max)
• Radiant Intensity (Io): 20 mW/sr (min at 50 mA)
• Viewing Angle (2θ½): ±20°
• Reverse Voltage (Vr): 2 V
• Operating Temperature Range: -25°C to +85°C
• Package Type: T-1 (3mm diameter)

Descriptions:

• The IR2E27A is a high-efficiency infrared LED designed for applications requiring reliable IR emission.
• It emits light at a peak wavelength of 940 nm, making it suitable for remote control systems, optical sensors, and communication devices.
• The device is housed in a T-1 (3mm) clear epoxy package, ensuring durability and optimal light transmission.

Features:

• High radiant intensity for improved signal transmission.
• Narrow viewing angle (±20°) for directed emission.
• Low forward voltage for energy-efficient operation.
• Compatible with automated assembly processes (tape and reel packaging available).

For detailed datasheets or further technical information, refer to SHARP's official documentation.

# IR2E27A: Technical Analysis and Implementation Considerations

## Practical Application Scenarios

The IR2E27A is a high-performance infrared (IR) receiver module manufactured by SHARP, designed for remote control systems and IR data communication. Its primary applications include:

1. Consumer Electronics Remote Controls

The module is widely used in TVs, air conditioners, and home theater systems due to its high sensitivity to 38 kHz modulated IR signals. Its built-in photodiode and preamplifier ensure reliable reception even in low-signal environments.

2. Industrial Automation

In automated systems, the IR2E27A facilitates contactless data transmission for sensor triggering or equipment synchronization. Its noise immunity makes it suitable for environments with electrical interference.

3. IoT and Smart Devices

The component integrates seamlessly with microcontroller-based systems, enabling IR-based configuration or control in smart lighting, security systems, and wearable devices.

4. Automotive Infotainment Systems

Some vehicle manufacturers employ the IR2E27A for rear-seat entertainment control, leveraging its robust performance across varying ambient light conditions.

## Common Design-Phase Pitfalls and Avoidance Strategies

1. Incorrect Carrier Frequency Matching

*Pitfall:* The IR2E27A is optimized for 38 kHz modulation. Mismatched frequencies from the transmitter lead to signal loss.

*Solution:* Verify transmitter frequency accuracy using an oscilloscope and ensure alignment with the receiver’s specifications.

2. Ambient Light Interference

*Pitfall:* Direct sunlight or fluorescent lighting can saturate the photodiode, causing false triggers.

*Solution:* Implement optical filtering (e.g., a black epoxy coating) or software debouncing to reject spurious signals.

3. Power Supply Noise

*Pitfall:* Ripple or voltage fluctuations degrade signal-to-noise ratio.

*Solution:* Use a regulated power supply with decoupling capacitors (e.g., 100 nF ceramic near the VCC pin).

4. Inadequate PCB Layout

*Pitfall:* Poor grounding or trace routing introduces noise.

*Solution:* Keep the receiver away from high-frequency traces and use a solid ground plane. Minimize lead lengths to reduce parasitic capacitance.

## Key Technical Considerations for Implementation

1. Electrical Characteristics

• Operating voltage: 2.7–5.5 V
• Supply current: 0.35 mA (typical)
• Output signal: Active low (logic-high in standby)

2. Signal Conditioning

Pair the module with a microcontroller’s external interrupt pin for efficient pulse decoding. Implement a timeout mechanism to handle incomplete transmissions.

3. Environmental Factors

Ensure the IR window material (e.g., polycarbonate) does not attenuate the 940 nm wavelength. Avoid placing the receiver behind tinted or reflective surfaces.

4. Testing and Validation

Use an IR signal generator to validate range (typically 10–20 meters) and angular sensitivity (±45° recommended for optimal coverage).

By addressing these factors, designers can maximize the reliability and performance of the IR2E27A in diverse applications.