H11AA1 AC Input/Phototransistor Optocoupler DIP-6

H11AA1 AC Input/Phototransistor Optocoupler DIP-6 is a highly effective solution for sensing AC signals while maintaining galvanically isolated signal transmission between power and control circuits. This device integrates two GaAs infrared emitting diodes in an inverse parallel configuration. Consequently, the H11AA1 responds directly to AC currents without requiring an external bridge rectifier, which reduces component count and complexity. The output features a high-sensitivity NPN phototransistor that translates the optical signal into a usable electrical current for microcontrollers. Furthermore, the 5300 V_RMS isolation rating protects your sensitive low-voltage logic from dangerous voltage spikes and surges on the AC line. Therefore, engineers typically select this optocoupler to implement precise zero-crossing detection and AC line status monitoring in compact designs.

Key Features:

• Bi-directional AC Input: Dual inverse-parallel LED architecture allows the device to process full AC waveforms directly.
• High Voltage Isolation: Provides a massive 5300 V_RMS isolation barrier, ensuring safe operation in high-voltage environments.
• Logic Compatible Output: The phototransistor output interfaces seamlessly with TTL, LSTTL, and CMOS logic families.
• Standard DIP-6 Footprint: Fits perfectly into standard breadboards and PCB layouts, facilitating easy prototyping and mass production.
• Exceptional Stability: Operates reliably over a wide industrial temperature range to maintain signal integrity in harsh conditions.

Technical Specifications:

• Input Forward Current (I_F): ±60 mA
• Collector-Emitter Voltage (V_CEO): 30 V maximum
• Current Transfer Ratio (CTR): 20% minimum (at I_F = ±10 mA)
• Isolation Test Voltage: 5300 V_RMS
• Collector Dark Current: 50 nA typical
• Operating Temperature Range: −55°C to +100°C
• Power Dissipation: 250 mW total

Mechanical Specifications:

• Package Type: DIP-6 (Through-Hole)
• Case Material: Molded Plastic (UL 94V-0 Rated)
• Lead Finish: Pure Tin plating
• Weight: ≈ 0.45 grams

Dimensions:

• Body Length: ≈ 8.51 mm
• Body Width: ≈ 6.35 mm
• Seated Height: ≈ 3.56 mm
• Lead Pitch: 2.54 mm
• Row Spacing: 7.62 mm

Pinout and Wiring:

• Pin 1 (Anode/Cathode): Connect to the first leg of the AC input signal.
• Pin 2 (Cathode/Anode): Connect to the second leg of the AC input signal (usually through a current-limiting resistor).
• Pin 3 (NC): No internal connection; however, you may use it for PCB trace routing if necessary.
• Pin 4 (Emitter): Connect to the ground (GND) of the output logic circuit.
• Pin 5 (Collector): Connect to the microcontroller input pin with a pull-up resistor.
• Pin 6 (Base): Leave this pin open for standard operation or connect it via a high-value resistor to adjust sensitivity.

Datasheet Reference:

• Download H11AA1 AC Input Optocoupler Datasheet

Commonly Used in:

• Zero-Crossing Detectors: Creating timing pulses at the zero-voltage point for Triac and SCR triggering.
• Smart Home Switches: Detecting the state of an AC wall switch to trigger smart lighting scenes.
• Industrial PLCs: Interfacing AC field sensors with 24V or 5V DC control logic.

Applications:

• AC Line Monitoring: Sensing the presence or absence of mains power in backup systems.
• Telephone Ring Detection: Recognizing incoming ring signals in telecommunication equipment.
• Feedback Loops: Providing isolated feedback in AC-DC power supplies.
• Microprocessor Interfacing: Safely isolating digital processors from high-voltage AC environments.

Equivalent Models:

• H11AA2 / H11AA4: These models offer different Current Transfer Ratio (CTR) ranges but share the same footprint.
• SFH620A: A common alternative with bi-directional input and similar isolation ratings.
• LTV-814: A 4-pin alternative; however, it lacks the base pin found on the DIP-6 H11AA1.

Package Includes:

• 1 x H11AA1 AC Input/Phototransistor Optocoupler DIP-6