LH1540AABTR Relays

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Full model number: LH1540AABTR

Manufacturer: STMicroelectronics

Device type: Optocoupler / Solid-state relay (1 Form A)

Package: SMD-6 (surface mount, 6-pin)

Operating voltage: 350V (load side)

Operating temperature: -40°C ~ +85°C (industrial grade)

Isolation voltage: 3750Vrms (input-output)

Input trigger current: 5mA (maximum)

On-resistance: 20Ω (typical)

Switching time: 0.5ms on/0.1ms off

Load current: 120mA continuous

Insulation resistance: 10¹²Ω (input-output)

Description

A solid-state relay (SSR) is a special type of electronic switch or input/output device that is used to control the on/off state of an electrical device. They can be used to turn power on, off, or regulate the amount of power delivered to a connected device. The LH1540AABTR is an example of an SSR that has several key features that make it ideal for a wide range of applications. When voltage is applied to its input terminals, a small amount of current is sent to the module, which in turn switches the output. This output can be used to turn a connected device on or off, or to control the amount of power delivered to a device. The output is completely isolated from the input, so any voltage fluctuations or spikes will not cause any damage to the device. The main component is an optically isolated triac, which contains two transistors. When power is applied to the input terminals, the triac triggers the transistors, closing the switch between the input and output. When the switch is closed, power is delivered to the connected device; when the switch is open, power is removed. The advantage of this type of switch is that it can be opened and closed quickly, allowing inputs and outputs to be connected or disconnected instantly. It consumes only a few milliamps of current, making it extremely energy efficient. This makes it ideal for applications that require low power inputs, such as consumer electronics or energy-conscious applications such as home automation. The LH1540AABTR is a high performance, low power solid state relay that is ideal for a wide range of low current and low voltage applications. Its low power input, long life and high reliability make it an ideal choice for many applications that require efficient power control. Its optically isolated triac design makes it easy to use, while its low power consumption makes it ideal for energy-efficient consumer electronics.

Features

   1. Isolation test voltage 5300 VRMS

   2. Typical on-resistance 22 Ω

   3. Load voltage 350 V

   4. Load current 120 mA / 250 mA

   5. Clean, jitter-free switching

   6. Low power consumption

Applications

   1. General telecom switching

   2. Security equipment

   3. Instrumentation

   4. Industrial control

Pin definition (SMD-6)

Typical application circuit

   MCU controls AC load:

                     MCU GPIO ──┬─ 220Ω current limiting resistor ── Anode(1)

                                            │

                                         GND ─────── Cathode(2)

           Load power supply L ─── Drain(5) ─── Load ─── Load power supply N

                                                   │

                                               Source(6) ──────────────┘

Design considerations

   1. Load selection:

       - Maximum load current cannot exceed 120mA

       - Inductive loads require a transient suppression diode in parallel

   2. Thermal management:

       - When the maximum current is continuous, it is recommended that the PCB copper foil area be ≥2cm²

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