Oscillator SJK 25.000 25MHz SMD 3.2x2.5mm Antminer Hashboard

SJK 25MHz Crystal Oscillator – Restore Clock Signal on Antminer Hashboards

The SJK 25.000 is a 25 MHz CMOS crystal oscillator in a compact 3.2 × 2.5 × 1.0 mm SMD package, purpose-designed for Bitmain Antminer hashboards. It provides the stable reference clock that synchronises communication between the ASIC chips and the control board. When this oscillator fails or drifts beyond tolerance, the hash chain loses synchronisation — resulting in missing chips, erratic hash rate, or a board that refuses to initialise entirely.

Role of the 25 MHz Oscillator on Antminer Hashboards

Every ASIC chip on a Bitmain hashboard derives its internal clocks from a shared reference oscillator. The 25 MHz signal is typically buffered and distributed across the entire chip chain, meaning a single failed oscillator can take down an entire board. Unlike passive crystals that require external load capacitors and a driver circuit, this CMOS oscillator integrates the driver internally — it only needs a clean supply voltage (1.8–3.3 V) and a decoupling capacitor to operate, simplifying both the board design and the replacement procedure.

Diagnosing a Failed Oscillator

Symptoms of a dead or degraded oscillator include: the board powers on but detects zero chips, the miner firmware logs show communication timeouts, or the hash rate fluctuates wildly despite stable temperatures and voltages. To confirm, probe the oscillator output pad with an oscilloscope — you should see a clean 25 MHz square wave with 1.8–3.3 V amplitude. If the output is absent, distorted or at the wrong frequency, the oscillator needs replacement.

Replacement Procedure

The oscillator is a four-pad SMD component. Apply flux around the pads, use a hot-air station at 280–300 °C to remove the failed unit, and clean the pads with solder wick. Position the new SJK 25.000 with pin-1 (usually marked with a dot) oriented per the board silkscreen, apply solder paste, and reflow. After installation, verify the 25 MHz output with a scope or frequency counter before reassembling the board into the miner.

SJK 25.000 Oscillator Specifications

Related Oscillators & Hashboard Components

• 26MHz Crystal Oscillator – Antminer S19 Pro Hashboard
• 24MHz Crystal Oscillator – Whatsminer M21S Hashboard
• 25MHz Ceramic Oscillator – Avalon 1166 Pro Repair
• T250 Crystal Oscillator – Antminer & IceRiver Hashboard

Stocking up on oscillators for a batch of hashboard repairs? Contact us at contact@lys-sz.com — we carry all common frequencies for Antminer, Whatsminer and Avalon boards.

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