DC 5V Bistable Flip-Flop Latch Relay Module | Self-Locking
DC 5V Bistable Flip-Flop Latch Relay Module | Self-Locking
DC 5V Flip-Flop Latch Relay Module – 1-Channel Bistable Self-Locking Switch
Take precise control of your electronics projects with this DC 5V Bistable Flip-Flop Latch Relay Module. Featuring a single-key self-locking design, this 1-channel relay board allows you to toggle output states with a single trigger pulse — no need to hold the signal. Ideal for DIY electronics, industrial control systems, smart home upgrades, and automotive start/stop circuits.
Made in Mainland China.
Key Features
- Bistable Single-Key Switching: Each trigger pulse flips the relay state (ON→OFF or OFF→ON), making operation simple and intuitive for a wide range of control applications.
- Self-Locking Design: Once triggered, the relay holds its state until the next signal — no continuous power needed to maintain position, ensuring stable, reliable operation.
- Flexible Trigger Modes: Supports both high-level signal (3V+) and physical switch inputs, allowing versatile integration with microcontrollers (Arduino, Raspberry Pi), PLCs, and manual switches.
- Built-In Anti-Jitter Circuit: Onboard debounce circuitry filters out signal noise and electromagnetic interference, delivering consistent performance even in demanding environments.
- Wide Application Range: Suitable for industrial equipment control, smart home appliance automation, vehicle ignition start/stop modification circuits, and more.
Technical Specifications
| Supply Voltage | DC 5V (operating range: 4.5V – 6V) |
| Standby Current | 1.0 mA |
| Working Current | 68 mA |
| Signal Trigger Level | High level ≥3V (limit: -2V to +8V) |
| Output Mode | Passive (switching) – 1× NO + 1× NC contacts |
| Output Capacity | 10A @ DC 30V or AC 250V |
| Switching Time | ~10 ms (±1% error) |
| Relay Service Life | 100,000+ operations (at ≤10A) |
| Board Dimensions | 74 × 20 × 20 mm |
| Mounting Hole Spacing | 69 × 16 mm center-to-center, Ø2.6 mm holes |
| Package Type | SOP |
Terminal Description
- + — Power supply positive terminal
- – — Power supply negative terminal
- K — Signal input terminal
- NO — Normally Open relay contact
- NC — Normally Closed relay contact
- COM — Relay common contact
Package Includes
- 1× DC 5V Bistable Flip-Flop Latch Relay Module (Single Channel, Self-Locking)
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Frequently Asked Questions
Q: What does "bistable" mean on this relay module?
A: A bistable relay module has two stable states — ON and OFF. Each time a trigger signal is applied to the K terminal, the relay toggles between these states. Unlike a standard relay that requires continuous power to stay energized, the bistable design holds its last state even after the trigger pulse ends, making it perfect for self-locking switch applications.
Q: What microcontrollers or devices are compatible with this DC 5V relay module?
A: This relay module is compatible with virtually any device that outputs a high-level signal of 3V or greater, including Arduino, Raspberry Pi, ESP32/ESP8266, PLCs, and standard 5V logic boards. It can also be triggered by a simple physical push-button switch connected to the K terminal.
Q: Can this relay module be used for automotive start/stop or vehicle modification circuits?
A: Yes. The self-locking bistable design makes this module well-suited for vehicle modification projects such as single-button start/stop systems. Its anti-jitter circuitry also ensures reliable operation in the electrically noisy environment of an automobile.
Q: What is the maximum load this relay module can switch?
A: The onboard relay is rated for up to 10A at DC 30V or AC 250V. Always ensure your actual load remains within these rated limits to maintain safe and reliable long-term operation.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.