20 MHz at 125°C — automotive temp grade in a 2.5×2 mm footprint
The ECS-200-8-36B2-CES-TR: The ESR is 50 Ohms, which is unremarkable for this frequency and load capacitance, but the 8pF load capacitance aligns with common MCU oscillator circuits without requiring external capacitors.
±10ppm tolerance + ±50ppm stability — total frequency error budget
Frequency tolerance is ±10ppm at 25°C and frequency stability is ±50ppm across the operating temperature range. Combined, the worst-case total error is ±60ppm — that is 60 Hz of drift on a 1 MHz reference, or 1.2 kHz at 20 MHz. For a UART clock or a sensor sampling trigger, ±60ppm is well within the typical ±1% baud-rate error budget and leaves comfortable headroom. If the downstream PLL multiplies the crystal frequency, that error multiplies too — a ×8 PLL turns ±60ppm into ±480ppm at the PLL output, which matters for any timing-critical function that originates post-multiplication.
ECX-2236B2 series — sourcing and active status
Listed as Active by ECS Inc.. The part ships in tape-and-reel or cut-tape packaging. No official successor or cross-reference appears in the ledger for this specific order code — the family ECX-2236B2 continues in production, so other frequencies within that series share the same footprint and are candidates if the load capacitance and ESR are acceptable.