Golledge UM Crystal filter package options

GMCF-21 21G12B

21.4MHz 4 pole crystal filter with 12.0kHz 3dB bandwidth

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  • Custom specifications available
Configurable Options
ParameterOption Code
Quantity / Special Request

Please specify the quantity you require below.

The GMCF-21 21G12B 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. Please see handling & storage specification for more information on how filter pairs are supplied for these products. 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. 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 GMCF-21 21G12B 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 Package options available - see Package Drawing
Operating temperature range -20 to +70°C
Number of poles 4
Pass band -3dB @ ±6.0kHz min
Attenuation band -40dB @ ±20.0kHz max
In-band ripple 1.0dB max
Insertion loss 2.5dB max
Guaranteed attenuation -65dB max +350 ~ +1000kHz
-80dB max -200 ~ -1000kHz
Termination 1200Ω // 2.5pF
Coupling capacitance (CC) 10.5pF
Package style UM-1/3Lx2, UM-5/3Lx2 (through-hole)
UM-1JN/3Lx2, UM-5JN/3Lx2 (SMT)
Package Drawing
Package footprint and configuration drawing for 2-unit UM-1 and UM-5 Crystal filters
Ordering Information

To request a quotation for the GMCF-21 21G12B 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.

Tape & Reel Specification
Tape and Reel specifications

UM-1J - A:330 B:24 C:14.1 D:8.4 E:12 F:4.6 G:80 H:21
UM-5J - A:180 B:24 C:12.5 D:8.4 E:12 F:4.4 G:60 H:21

Handling & Storage

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

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

4-pole filter packaging  

These filters are individually matched pairs. One filter is composed of two physical units, which have been factory-matched for optimum performance.

DO NOT MIX. Unmatched pairs will offer impaired performance.

For filters supplied in boxes, please refer to the above diagram.

Matched pairs may also be supplied in individual bags.


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