Golledge UM Crystal filter package options

GMCF-21 21G7A 21.4MHz 2 pole crystal filter with 7.5kHz 3dB bandwidth

  • 21.4MHz Centre Frequency
  • Two Pole
  • Low insertion loss
  • Comprehensive stocks
Configurable Options
ParameterOption Code
Quantity / Special Request

Please specify the quantity you require below.

The GMCF-21 21G7A is supplied in either a leaded (UM-1 or UM-5 style) package, or a jacketed (UM-1J or UM-5J) package. UM-1 or UM-5 style packaged products are supplied in boxes or bags. UM-1J or UM-5J style packaged products are supplied on tape and reel. 300 pcs per reel is the standard T&R pack sizes for these products. Partial quantities may be supplied on tape (no reel), or in bulk.
Product Description
The two pole 21G7A crystal filter with centre frequency of 21.4MHz, and minimum bandwidth of±7.5kHz 3dB @ 3dB, comes in one 7.8 x 3.2mm footprint leaded package, with final component height above board of 8.0mm maximum. This filter features extremely low in-band ripple specifications of only 0.5dB, and low insertion loss of only 1.5dB making it ideal for applications that require minimum design-in impact. Tight attenuation band less than ±18kHz @ -20dB and good guaranteed attenuation characteristics mean uncompromised receiver performance.
Centre frequency 21.4MHz
Dimensions Package options available - see Package Drawing
Operating temperature range -20 to +70°C
Number of poles 2
Pass band -3dB @ ±3.75kHz min
Attenuation band -20dB @ ±18.0kHz max
In-band ripple 0.5dB max
Insertion loss 1.5dB max
Guaranteed attenuation -35dB max +350 ~ +1000kHz
-50dB max -200 ~ -1000kHz
Termination 850Ω // 6.0pF
Package style UM-1/3L, UM-5/3L (through-hole)
UM-1JN/3L, UM-5JN/3L (SMT)
Package Drawing
Package footprint and configuration drawing for UM-1 and UM-5 Crystal filters showing SMD options
Ordering Information

To request a quotation for the GMCF-21 21G7A 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 sales@golledge.com.

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.

Handling & Storage

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

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

Resistance weld

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