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UM4401
Union Semiconductor International Limited
4-Line RC EMI Filter with TVS
8192 Pcs New Original In Stock
RC (Pi) EMI Filter 2nd Order Low Pass 4 Channel R = 100Ohm, C = 10pF 8-UFDFN
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5.0 / 5.0
- (56 Ratings)
UM4401
Product Overview
10154103
DiGi Electronics Part Number
UM4401-DGManufacturer
Union Semiconductor International Limited
UM4401
Description
4-Line RC EMI Filter with TVSInventory
8192 Pcs New Original In Stock
RC (Pi) EMI Filter 2nd Order Low Pass 4 Channel R = 100Ohm, C = 10pF 8-UFDFN
Quantity
Minimum 1
Minimum 1
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UM4401 Technical Specifications
Category
EMI/RFI Filters (LC, RC Networks)
Packaging
Tape & Reel (TR)
Series
-
Product Status
Active
Type
Low Pass
Filter Order
2nd
Technology
RC (Pi)
Number of Channels
4
Center / Cutoff Frequency
150MHz (Cutoff)
Attenuation Value
-36dB @ 800MHz, -32dB @ 2 ~ 5GHz
Resistance - Channel (Ohms)
-
Values
R = 100Ohm, C = 10pF
ESD Protection
Yes
Operating Temperature
-40°C ~ 85°C
Applications
Data Lines for Mobile Devices
Voltage - Rated
5V
Mounting Type
Surface Mount
Package / Case
8-UFDFN
Size / Dimension
0.083" L x 0.063" W (2.10mm x 1.60mm)
Height
0.024" (0.61mm)
Datasheet & Documents
Datasheets
Download UM4401 Product Specification (PDF)
HTML Datasheet
UM4401-DG
Environmental & Export Classification
RoHS Status
RoHS Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
HTSUS
8542.39.0001
Additional Information
Other Names
3351-UM4401TR
Standard Package
2
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
DiGi Electronics’ commitment to quality and support is evident in every interaction, making them our preferred supplier.
Dec 02, 2025
Their customer care team provided personalized assistance when I had questions about my order history.
Dec 02, 2025
Their efficient support made resolving issues quick and simple.
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Frequently Asked Questions (FAQ)
Can the UM4401 be used as a drop-in replacement for the Texas Instruments TPD4E05U06 in a high-speed USB 2.0 data line protection circuit, and what are the key performance trade-offs to consider?
The UM4401 is not a direct functional replacement for the TPD4E05U06 due to fundamental architectural differences: the UM4401 integrates a 2nd-order RC Pi filter with 100Ω resistors and 10pF capacitors per channel, while the TPD4E05U06 is a pure TVS diode array without filtering components. Although both offer ESD protection and target data lines, substituting the UM4401 introduces intentional signal attenuation above 150MHz, which may degrade USB 2.0 signal integrity (especially eye diagram compliance) due to added series resistance and capacitive loading. Additionally, the UM4401’s -36dB attenuation at 800MHz could over-filter high-frequency components essential for rise-time fidelity. If EMI suppression is the primary goal and signal integrity margins are robust, the UM4401 may be viable—but thorough signal integrity simulation or testing with actual PCB parasitics is strongly recommended before adoption.
What are the risks of using the UM4401 in a 5Gbps USB 3.2 Gen 1 interface, and how does its cutoff frequency impact signal integrity at that data rate?
Using the UM4401 in a 5Gbps USB 3.2 Gen 1 interface poses significant signal integrity risks due to its 150MHz cutoff frequency and 100Ω series resistance per channel. The fundamental Nyquist frequency for 5Gbps is 2.5GHz, well beyond the filter’s effective passband, meaning the UM4401 will severely attenuate critical high-frequency signal components, leading to excessive jitter, eye closure, and potential link failure. While the -32dB attenuation specified between 2–5GHz confirms strong EMI suppression, it simultaneously destroys signal fidelity required for reliable high-speed communication. This device is engineered for lower-speed mobile data lines (e.g., UART, I2C, or legacy USB 2.0 with tight EMI constraints), not multi-gigabit interfaces. For USB 3.x applications, consider low-capacitance TVS arrays like NXP IP4791CZ16 or Bourns CDSOT23-SM712 with <0.5pF capacitance and no series resistance.
How does the UM4401’s 100Ω series resistance affect impedance matching in 90Ω differential pairs commonly used in MIPI D-PHY interfaces, and what mitigation strategies are recommended?
The UM4401’s 100Ω single-ended resistance per channel disrupts the 90Ω differential impedance target in MIPI D-PHY lines, potentially causing impedance mismatches, reflections, and signal degradation—especially problematic at speeds above 1Gbps. When placed in-line, the added resistance shifts the effective differential impedance and introduces asymmetry if layout isn’t tightly controlled. To mitigate this, ensure symmetric placement on both P and N lines, minimize trace length discrepancies, and avoid stubs. Additionally, simulate the channel with IBIS-AMI models including the UM4401’s R/C network and PCB parasitics to validate eye mask compliance. If impedance deviation exceeds 10%, consider alternative protection schemes such as common-mode chokes with integrated ESD (e.g., Murata DLW21SN900SQ2L) or relocate the UM4401 closer to the connector to limit unmatched segment length, reducing reflection impact.
Is the UM4401 suitable for automotive infotainment systems operating under ISO 10605 ESD testing conditions, given its MSL-3 rating and 5V rated voltage?
The UM4401 is not ideal for automotive infotainment systems subjected to ISO 10605 ESD tests (which specify discharges up to ±15kV contact, ±25kV air), despite its built-in TVS functionality. Its 5V working voltage and consumer-grade design lack the robust surge and transient immunity required for automotive environments. Furthermore, the MSL-3 rating (168 hours floor life) demands strict moisture control during assembly—challenging in high-volume automotive production without proper baking and dry-pack handling. Automotive applications typically require AEC-Q101 qualified devices with higher voltage ratings (e.g., 12V or 24V tolerant) and enhanced ESD robustness. For comparable filtering with automotive compliance, consider the STMicroelectronics ESDCAN04-2BWY or ON Semiconductor NUP4114UPXV6, which offer AEC-Q101 qualification, higher surge capability, and better environmental resilience.
What layout and grounding practices are critical when integrating the UM4401 into a compact mobile PCB to avoid unintended EMI coupling or performance degradation?
Proper layout is essential to preserve the UM4401’s EMI filtering performance and prevent noise coupling in dense mobile PCBs. First, place the device as close as possible to the connector or noise entry point to maximize filter effectiveness before signals reach sensitive circuitry. Use a solid ground plane beneath the 8-UFDFN package and connect all ground pins directly to this plane with minimal via inductance—avoid daisy-chaining grounds. Keep input and output traces separated by at least 3× the trace width to reduce crosstalk between channels, and route high-speed lines orthogonally if they must cross. Avoid running unfiltered aggressor signals (e.g., display clocks) parallel to filtered lines. Additionally, ensure the 0.61mm height doesn’t interfere with shielding cans or flex cables. Poor grounding or proximity to noisy traces can bypass the filter’s benefits, turning the UM4401 into an ineffective or even detrimental component in the signal path.
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.
UM4401 CAD Models
Union Semiconductor International Limited UM4401 PCB symbols & footprints
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