What load capacitance options are available for HCM49S?

HCM49S supports 6pF, 10pF, 18pF, or custom-specified load capacitance values.

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HCM49S SMD Quartz Crystal - FCom Frequency Components

SMD HC-49SMD, FCX-9M Pin to Pin HCM49S

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Quartz Crystal Resonators

FEATURE

HCM49S is a surface mount quartz crystal in HC-49US style SMD package for legacy timing use. Recommended replacement: FCX-9M.

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Datasheet

Product Description

HCM49S Surface Mount Quartz Crystal (HC-49US Type)

Q: What is HCM49S Quartz Crystal?

HCM49S is a legacy surface-mount quartz crystal in a HC-49US compatible SMD package. It is used in legacy WLAN, Bluetooth, and embedded designs.

Q: Is HCM49S RoHS and REACH compliant?

Yes, all HCM49S models are fully compliant with RoHS and REACH environmental directives.

Q: What is the recommended replacement for HCM49S?

We recommend FCX-9M as the new-generation SMD replacement, offering better SMT performance and supply continuity.

⚠ Legacy Support Notice

HCM49S is maintained for legacy applications requiring HC-49US-style surface-mount footprints. For new designs, we strongly recommend FCX-9M, which offers better SMT compatibility and modern production standards.

HCM49S is a resistance-welded SMD quartz crystal resonator built on the legacy HC-49US footprint. It ensures timing compatibility with earlier WLAN and Bluetooth modules while supporting RoHS-compliant manufacturing.

Key Features

Legacy HC-49US SMD footprint
Resistance welded enclosure
Frequency range: 3.2 to 64 MHz
Available with 6pF / 10pF / 18pF or specified CL
RoHS & REACH compliant

Typical Applications

Bluetooth audio modules
WLAN transceivers
IoT gateway and hub circuits
Legacy embedded platforms

Electrical Specifications

Parameter	Specification
Nominal Frequency	3.2 ~ 64 MHz
Frequency Tolerance	±10 ppm @ 25°C
Temperature Stability	±50 ppm (-40 ~ 85°C), ±80 ppm (-40 ~ 105°C)
Load Capacitance (CL)	6 / 10 / 18 pF or specified
Operating Temp. Range	-40°C to +105°C
Drive Level	100 µW (typical)
Aging (1st year)	±3 ppm max.

Recommended Replacement

FCX-9M is the next-generation HC-49 SMD timing crystal, offering better solderability, performance, and production longevity.

Frequently Asked Questions (FAQ)

What is HCM49S Quartz Crystal?

HCM49S is a legacy SMD quartz resonator in a HC-49US compatible form factor, suitable for legacy timing designs in Bluetooth, Wi-Fi, and microcontroller systems.

Is HCM49S RoHS and REACH compliant?

Yes, HCM49S meets international environmental directives and is manufactured lead-free.

What is the recommended replacement for HCM49S?

We recommend FCX-9M, which offers enhanced SMT solderability and longer availability for new applications.

What load capacitance options are available?

Standard options include 6pF, 10pF, 18pF, or custom values upon request.

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