Both NO and NC contacts incorporated in a compact DIP8-pin Reinforced insulation # Technical Document: AQW610EHAX Solid State Relay (SSR)
Manufacturer: PANASONIC
Component Type: Photovoltaic MOSFET Relay (Solid State Relay)
Document Version: 1.0
Date: October 2023
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## 1. Application Scenarios (≈45%)
### 1.1 Typical Use Cases
The AQW610EHAX is a photovoltaic MOSFET relay designed for signal switching and load control in low-to-medium power applications. Its core function is to provide galvanic isolation between control circuits and switched loads using an infrared LED optically coupled to a photovoltaic generator and MOSFET output stage.
Primary switching functions include:
- Analog signal switching: Multiplexing sensor signals (temperature, pressure, strain gauges) in data acquisition systems.
- Digital signal routing: Isolating digital I/O lines in PLCs, microcontroller interfaces, or communication modules.
- Low-power load control: Directly driving small relays, solenoids, lamps (<100mA), or as a pilot device for larger contactors/relays.
### 1.2 Industry Applications
| Industry | Application | Rationale for AQW610EHAX Use |
| :--- | :--- | :--- |
| Industrial Automation | PLC I/O modules, sensor interfacing, safety circuit isolation | High isolation voltage (5000Vrms) protects control logic from field-side transients; long life vs. electromechanical relays. |
| Test & Measurement | Automated Test Equipment (ATE), data acquisition switching, instrument multiplexing | Low thermal EMF, minimal offset voltage, and high OFF-state resistance ensure signal fidelity. |
| Medical Equipment | Patient-isolated signal switching in monitors, diagnostic devices | Biocompatibility of materials (typically), excellent isolation for patient safety standards. |
| Telecommunications | Line card switching, modem isolation, backup battery circuit management | Low power consumption, small footprint, and high-speed switching suitable for telecom racks. |
| Energy Management | Smart meter relay isolation, solar panel bypass switching, battery management systems | No arc generation, suitable for hazardous environments; handles DC and AC loads. |
### 1.3 Practical Advantages and Limitations
Advantages:
- Long Lifespan & High Reliability: No moving parts, eliminating contact wear, bounce, and arcing. Excellent for high-cycle applications (>10⁹ operations).
- Fast Switching: Turn-on/off times in the millisecond range, significantly faster than most EMRs.
- Low Power Control: LED drive current typically 5-10mA, compatible with most logic-level outputs (3.3V, 5V).
- Zero Cross Function (for AC models): Note: The AQW610EHAX is a DC output relay. For AC switching, refer to the AQW610 A HAX variant.
- Excellent Noise Immunity: Optical isolation rejects ground loops and common-mode noise.
- Compact & Mounting Flexible: SOP4 surface-mount package saves board space.
Limitations:
- Output Voltage Drop: Has a forward voltage drop across the MOSFET (Rds(on) ~ 0.8Ω typical), causing power dissipation (P = I² * Rds(on)) and heat generation in the ON state.
- Leakage Current: Small OFF-state leakage current (µA range) may be critical for very high-impedance signal paths.
- Limited Current Capacity: Maximum continuous output current is 100mA . Not for direct motor or heater control.
- Thermal Sensitivity: Rds(on) increases with junction temperature, affecting voltage drop. Requires thermal management at higher currents.
- No Physical Isolation Visible: Unlike an EMR, the state is not visually verifiable without auxiliary circuitry.
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