49SMD Crystal Oscillators — Compact Surface-Mount Clock Sources

The 49SMD package is one of the most widely adopted surface-mount crystal oscillator form factors in the electronics industry. With a robust hermetically sealed metal can atop a flat ceramic or FR-4 base with solder pads, the 49SMD design delivers reliable frequency generation in a compact footprint that suits automated pick-and-place assembly. These crystal oscillators span a broad frequency range from 1 MHz to 200 MHz, covering everything from low-speed microcontroller clocking to high-speed Ethernet and USB reference clocks. As a trusted electronic components distributor, ADD Components supplies 49SMD oscillators from leading manufacturers including Abracon, TXC, Epson, and NDK for volume production and sourcing programmes.

Sub-Types and Variants

Standard 49SMD Metal-Can Oscillators

The classic 49SMD crystal oscillator features a rectangular metal lid resistance-welded to a base substrate, providing a hermetically sealed environment for the quartz crystal blank and oscillator IC. Typical dimensions range from 4.9 mm × 3.1 mm to 5.0 mm × 7.0 mm, with height profiles between 1.8 mm and 2.5 mm. These oscillators are available across the full 1 MHz to 200 MHz spectrum and are commonly specified with CMOS or TTL output logic. Popular applications include microcontroller system clocks, UART baud-rate generators, and general-purpose digital timing in consumer electronics and industrial control boards.

Low-Profile and Miniature 49SMD Derivatives

For space-constrained designs, manufacturers have refined the 49SMD format into smaller footprints while preserving the metal-can hermetic seal. Abracon’s ABM3B series, for instance, uses a 5.0 mm × 3.2 mm ceramic package with a height of just 1.1 mm, offering frequencies from 8 MHz to 125 MHz. These low-profile variants are ideal for wearables, IoT sensor nodes, and compact networking modules where board real estate and z-height are at a premium. Despite the reduced dimensions, they maintain the same frequency stability and ageing characteristics as full-size 49SMD oscillators.

High-Frequency and Differential-Output 49SMD Oscillators

At the upper end of the frequency range, 49SMD oscillators operating between 100 MHz and 200 MHz serve high-speed serial interfaces such as PCI Express, SATA, and Gigabit Ethernet. Epson’s SG-210 series and NDK’s NZ2520S series offer LVDS, LVPECL, and HCSL differential output options within SMD packages derived from the 49SMD topology. These devices deliver sub-picosecond phase jitter performance essential for maintaining signal integrity in high-speed data paths. ADD Components sources these precision frequency control products for networking equipment, server motherboards, and FPGA-based designs.

Key Selection Parameters

• Frequency Range: 1 MHz to 200 MHz; verify that the target frequency is available from the chosen manufacturer and series.

• Frequency Stability: Typically ±10 ppm to ±100 ppm over the operating temperature range; tighter stabilities of ±5 ppm or better are available for telecom and precision instrumentation.

• Output Logic: CMOS (most common), TTL, or differential (LVDS, LVPECL, HCSL) for high-speed applications.

• Supply Voltage: 1.8 V, 2.5 V, 3.3 V, or 5.0 V; match to the host board’s power rail to avoid level-translation circuitry.

• Package Dimensions: Verify the exact footprint (4.9 mm × 3.1 mm, 5.0 mm × 7.0 mm, or custom) and pad layout against the PCB land pattern.

• Operating Temperature Range: Commercial (0 °C to +70 °C), industrial (−40 °C to +85 °C), or extended automotive (−40 °C to +125 °C).

• Ageing: Long-term frequency drift, typically ±3 ppm to ±5 ppm per year; critical for applications requiring lifetime calibration stability.

• Phase Jitter: Integrated RMS phase jitter (12 kHz to 20 MHz), typically below 1 ps for high-speed serial link clocks.

Representative Oscillators We Source

Send Us Your Oscillator Requirements

ADD Components maintains an extensive inventory of 49SMD crystal oscillators and has direct relationships with Abracon, TXC, Epson, NDK, and other major frequency control manufacturers. Whether you need standard 25 MHz crystals for a production run or custom-specified 156.25 MHz differential oscillators for a networking design, our procurement team can source competitive pricing and manage lead times. Send your bill of materials, target pricing, and volume forecasts, and we will respond with a quotation within one business day.

Info@addcomponents.hk | +852 5334 3091 | WhatsApp: +852 5334 3091

Back to Oscillator Guide