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GSF-72 21S12B 21.4MHz 4 pole crystal filter with 12.0kHz 3dB bandwidth

  • Other frequencies up to 70MHz available
  • Custom specifications available
  • Miniature SM package
Configurable Options
ParameterOption Code

The GSF-72 21S12B has no configurable options.
Please see the specifications table for more details or contact our team today if you have other specification requirements.

Quantity / Special Request

Please specify the quantity you require below.

The GSF-72 21S12B is supplied on tape and reel. 1k or 3k pcs per reel are the standard T&R pack sizes for this product. Partial quantities may be supplied on tape (no reel), or in bulk. These filters are supplied as a pair of units with a pocket space between matching pairs, please see tape & reel specification for more information.
Product Description
The GSF-72 21S12B 4 pole crystal filter from Golledge with centre frequency of 21.4MHz features a 12kHz 3dB bandwidth and is available in multiple packages, including both UM-1 and UM-5 style leaded packages and UM-1J and UM-5J surface mount packages. This filter also features insertion loss of just 2.5dB dB. Find full specifications here.
Centre frequency 21.4MHz
Dimensions 7.2 x 5.2 x 1.2mm
Operating temperature range -20 to+70°C
Number of poles 4
Pass band -3dB @ ±6.0kHz min
Attenuation band -35dB @ ±20.0kHz max
In-band ripple 1.0dB max
Insertion loss 2.5dB max
Guaranteed attenuation -80dB max -910 ±10kHz
Termination 1200Ω // 1.5pF
Coupling capacitance (CC) 7.5pF
Number of units 2
Package Drawing
Package footprint and configuration drawing for a 7050 6-pad Golledge 3-pole Crystal Filter showing full dimensions.
Ordering Information

To request a quotation for the GSF-72 21S12B please use the configurable options form to choose the options you require and then submit your configured product to our team. Our expert advisers are always happy to help with your requirements and can be contacted on +44 1460 256 100 or at

Following product selection you will be issued with a seven character Golledge part number. Your Golledge part number is the internationally accepted Golledge manufacturing part number (MPN) that should be used for all project documentation, including bills of materials (BoMs) and purchase orders.

If you have any queries regarding any of our documentation our dedicated sales team will be happy to help.

CAD Models
Our GSF-72 21S12B is included in the following design libraries. Click to download the library of your choice.
Soldering Profile
Solder reflow profile
Tape & Reel Specification
Tape and Reel specifications
A:250 B:17.5 C:7.9 D:5.4 E:8 F:1.7 G:80 H:21
Handling & Storage

ESD-HBM-1A Human Body Model (HBM) 1A (250V to <500V)

MSL1 Moisture Sensitivity Level (MSL): 1 (or not applicable)

Ceramic base with metal lid

PbFree Lead-free (< 0.1% by weight )

RoHS compliant with no exemptions RoHS compliant with no exemptions. See our declaration

REACH REACH compliant. See our statement

Conflict Minerals Statement Free of conflict minerals. See our declaration

Halogen Free Statement Free of Halogens. See our declaration

Ozone Depletion Statement Free of Ozone-depleting substances. See our declaration