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LFCN-490D+
Mini-Circuits
LTCC LOW PASS FILTER, DC - 490 M
1544 Pcs New Original In Stock
650MHz Cut Off Low Pass Ceramic Filter 50Ohm 4-SMD, No Lead
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LFCN-490D+
Product Overview
9833506
DiGi Electronics Part Number
LFCN-490D+-DGManufacturer
Mini-Circuits
LFCN-490D+
Description
LTCC LOW PASS FILTER, DC - 490 MInventory
1544 Pcs New Original In Stock
650MHz Cut Off Low Pass Ceramic Filter 50Ohm 4-SMD, No Lead
Quantity
Minimum 1
Minimum 1
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LFCN-490D+ Technical Specifications
Category
Ceramic Filters
Packaging
Tape & Reel (TR)
Series
-
Product Status
Active
Frequency
650MHz Cut Off
Impedance
50Ohm
Insertion Loss
1dB
Filter Type
Low Pass
Mounting Type
Surface Mount
Package / Case
4-SMD, No Lead
Size / Dimension
0.126" L x 0.063" W (3.20mm x 1.60mm)
Height (Max)
0.037" (0.94mm)
Datasheet & Documents
HTML Datasheet
LFCN-490D+-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8548.00.0000
Additional Information
Other Names
3157-LFCN-490D+TR
3157-LFCN-490D+DKR
3157-LFCN-490D+CT
Standard Package
3,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
Le site propose une navigation fluide, sans bugs ni ralentissements, ce qui a grandement facilité mon achat.
de desembre 02, 2025
What I appreciate most is their quick response time and willingness to resolve issues promptly.
de desembre 02, 2025
DiGi Electronics’s logistics accuracy is impressive—they rarely get the wrong items or orders mixed up.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the LFCN-490D+ in a high-density RF layout on a FR4 PCB?
When integrating the LFCN-490D+ into high-density RF designs on FR4, the primary risk is parasitic coupling due to its small 3.20mm x 1.60mm footprint. FR4's inconsistent dielectric constant can detune the filter response near the 650MHz cutoff. To mitigate, maintain strict impedance-controlled traces, minimize stub lengths, and use ground cutouts underneath adjacent components to reduce crosstalk. Simulate the layout with EM tools to verify passband ripple and rejection aren't compromised by nearby traces or vias.
Can the LFCN-490D+ replace the TDK MLF18KF650T10 in a battery-powered IoT transceiver, and what trade-offs should be considered?
Yes, the LFCN-490D+ can replace the TDK MLF18KF650T10 in IoT applications, but key trade-offs exist. While both are 650MHz low pass filters in similar SMD packages, the LFCN-490D+ offers better insertion loss (1dB vs. 1.2dB typical) and is RoHS3-compliant with MSL 1, improving manufacturability and reliability. However, the TDK part has tighter unit-to-unit consistency in phase response, which may matter in coherent systems. Validate group delay performance in your modulation scheme, especially for narrowband FSK or OOK.
How does the LFCN-490D+ perform under temperature cycling in outdoor telecom equipment, and what long-term reliability concerns should be addressed?
The LFCN-490D+ uses LTCC construction, which provides excellent thermal stability from -40°C to +85°C ambient. However, in outdoor telecom enclosures subject to condensation and thermal cycling, ensure proper conformal coating to prevent moisture ingress around the 4-SMD no-lead terminations. While the MSL 1 rating eliminates floor life concerns, stress on solder joints can occur over repeated cycles due to CTE mismatch with standard PCB materials. Use compliant solder alloys like SAC305 and avoid rigid mechanical mounting to extend field life.
What happens to harmonic suppression when the LFCN-490D+ is driven near its maximum power handling in a Class C PA output stage?
In Class C amplifier stages, driving the LFCN-490D+ near its upper RF power limit risks nonlinear behavior from ferrite saturation in the LTCC structure, reducing harmonic suppression beyond the 2nd harmonic. The 1dB insertion loss spec assumes small-signal conditions; at high drive, insertion loss may increase and the filter can re-radiate intermodulation products. Limit input power to ≤ +24dBm even if short-term peaks appear safe. For higher power, cascade with an external π-filter or consider a discrete LC alternative.
Is the LFCN-490D+ susceptible to EMI from adjacent digital lines, and how should board stack-up be optimized to maintain stopband rejection?
Yes, the LFCN-490D+ can couple noise from adjacent digital traces due to its ceramic-body construction allowing capacitive coupling through the substrate. In multilayer boards, place a solid ground plane directly beneath the filter (Layer 2) and avoid routing digital signals on adjacent layers within 2mm laterally. Use a 4-layer stack-up with dedicated RF and digital ground planes connected at a single point near the filter's ground pads. This preserves the stopband rejection beyond 650MHz, especially critical in mixed-signal systems like LTE Cat-M1 or LoRa gateways.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LFCN-490D+ CAD Models
Mini-Circuits LFCN-490D+ PCB symbols & footprints
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