Do not substitute a 5-pin changeover (SPDT) relay for the G8B-201-01 without checking the PCB layout. The G8B-201-01 is a 4-pin SPST-NO. Forcing a 5-pin part into a 4-pin footprint requires jumper wires and is not reliable.
Even a high-quality Omron relay has a finite life. Here are the typical failure modes for the G8B-201-01:
1. General Description The Omron G8B series is a compact, high-capacity PCB (printed circuit board) relay designed primarily for automotive applications (12V DC systems). The G8B-201-01 is a specific variant with single-pole, double-throw (SPDT) contacts.
2. Key Specifications
| Parameter | Value | | :--- | :--- | | Contact Form | 1 Form C (SPDT – Break before make) | | Coil Voltage | 12 VDC | | Coil Power Consumption | Approx. 1.6 W (typical) | | Contact Current Rating | 30A at 14 VDC (resistive load) | | Maximum Switching Current | 35A (momentary) | | Contact Material | Silver alloy (AgSnO, AgNi) | | Initial Contact Resistance | ≤ 50 mΩ | | Operate Time | ≤ 10 ms | | Release Time | ≤ 5 ms | | Insulation Resistance | ≥ 100 MΩ (at 500 VDC) | | Dielectric Strength | 500 VAC for 1 min (coil to contacts) | | Ambient Temperature | -40°C to +85°C (operating) | omron g8b-201-01
3. Physical Dimensions
4. Pin Configuration (Top view)
5. Typical Applications
6. Important Features
7. Cross-Reference / Equivalent Parts
8. Ordering Information The "01" suffix in G8B-201-01 may indicate a specific coil resistance value or contact material variation. Always check the full marking on the relay case.
9. Datasheet Source The official datasheet is available from Omron Electronic Components (document reference: G8B datasheet, EN 2002-06). For exact coil resistance and detailed derating curves, refer to the manufacturer's PDF.
If you need the official Omron datasheet PDF or a replacement suggestion, let me know. Do not substitute a 5-pin changeover (SPDT) relay
In the world of automotive electronics and industrial control systems, reliability is not a luxury—it is a necessity. When dealing with high-current loads, such as headlights, cooling fans, fuel pumps, or anti-lock braking systems (ABS), a standard low-power relay simply won’t suffice. This is where the Omron G8B-201-01 enters the spotlight.
For engineers, hobbyists, and automotive technicians, the Omron G8B-201-01 is a trusted name. It represents a specific class of electromechanical relay designed to handle heavy-duty switching tasks without succumbing to heat, vibration, or voltage spikes. This article provides a comprehensive deep dive into the specifications, applications, pin configuration, and common replacements for the Omron G8B-201-01.
If you suspect a relay is faulty in an ECU or module, a digital multimeter (DMM) is your best tool. Do not simply test continuity across the load pins without power—this can be misleading.