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QST QE101I
- Part No.:
- QE101I
- Manufacturer:
- QST
- Category:
- Specialized ICs
- Package:
- 4-UDFN Exposed Pad
- Description:
- 1.0x1.0 EMI SUPPRESSION IC 1.8~3
- Quantity:
Unit Price:$0
Ext Price:$0
- Payment:
- Shipping:
Product Details
QE101I - Active EMI Reduction IC
QST QE101I is an industrial-temperature active EMI-management IC that produces a nominal 1× phase-modulated copy of an input clock. QST specifies a four-pin micro-DFN package; the LCDChip record names it 4-UDFN Exposed Pad.
Confirm the exact QE101I grade and QST package drawing before layout or substitution.
Overview
QE101 uses phase-controlled active EMI management to spread clock-related spectral energy over a controlled band. A clock applied to CLKIN is reproduced as a nominal 1× phase-modulated signal at MODOUT. QST's ordering table identifies the I suffix as industrial grade, rated -20°C to +85°C.
Key Advantages
Phase modulation distributes narrowband clock energy that can contribute to EMI and RFI.
MODOUT maintains the input's nominal frequency while applying controlled modulation.
VDD, CLKIN, MODOUT and VSS simplify integration in compact timing paths.
QST describes a slew-rate-controlled buffer for additional emission management.
Feature Summary
Phase-controlled active EMI-management technology applies to periodic and aperiodic signals.
QST specifies 20–38 MHz input and output frequency in the supported supply bands.
Operation is specified at 1.6–2.0 V or 3.0–3.6 V; use the relevant data-sheet test conditions.
Four-pin micro-DFN with a manufacturer package drawing and recommended footprint.
Package & Footprint
The original LCDChip package value and package-registry name are 4-UDFN Exposed Pad. QST's QE101 Rev. 1.03 data sheet calls the package four-pin micro-DFN and includes dimensions and a recommended footprint. Confirm whether the site's exposed-pad naming and QST's drawing refer to the same mechanical construction before assembly.
- Use QST's controlled micro-DFN land pattern and pin-1 reference.
- Place local VDD decoupling and provide a low-impedance VSS path.
- Keep CLKIN and MODOUT routing consistent with clock-integrity needs.
The registered package JPG is missing from the production website. Use QST's dimension drawing for footprint verification.
Pin Functions
QST's four-pin QE101 pin-description table assigns:
System power-supply input.
Clock input.
Nominal 1× phase-modulated buffered output.
System ground reference.
Check the physical pin-1 orientation against QST's package top and bottom views.
Key Specifications
| Function | Active clock/data EMI-reduction IC |
|---|---|
| Output | Nominal 1× phase-modulated signal at MODOUT |
| Input frequency | 20–38 MHz |
| Output frequency | 20–38 MHz, nominally tracking the input |
| Low-voltage operating band | 1.6–2.0 V |
| Higher-voltage operating band | 3.0–3.6 V |
| Industrial grade | QE101I: -20°C to +85°C in QST ordering information |
| Interface | Four pins: VDD, CLKIN, MODOUT, VSS |
| Output buffer | Slew-rate controlled, per QST feature description |
| Package | Four-pin micro-DFN; site record 4-UDFN Exposed Pad |
| Package documentation | QST dimension drawing and recommended footprint |
Refer to QST's electrical tables for supply-specific loading, rise/fall-time, duty-cycle and current test conditions.
Replacement Considerations
A substitute must match the clock range, supply band, modulation behavior, output drive, temperature grade and exact four-pin footprint. QE101 suffixes for commercial or automotive grades are not automatically equivalent to QE101I. No unverified LCDChip alternative-product link is asserted.
Manufacturer Information
QST's QE101 EMI Reduction IC Rev. 1.03 data sheet documents the four-pin interface, electrical operating bands, QE101I industrial ordering grade and micro-DFN package drawing. Check the latest controlled revision and any QST notices before qualification.
Applications
Evaluate clock-related emissions in display electronics.
Manage emissions from compact clock sources where timing margins permit.
Assess EMI in power- and space-sensitive handheld designs.
Compare system emission results with and without phase modulation.
Quality & Authenticity
Confirm exact QE101I marking, industrial temperature grade, package geometry and lot traceability against QST documentation. Verify output timing and EMI on the assembled board.
FAQ
Does QE101I change the nominal frequency?
It produces a nominal 1× phase-modulated copy of the input clock; the modulation spreads spectral energy.
What clock range does QST specify?
The data sheet specifies 20–38 MHz input and output ranges under its stated operating conditions.
What does the I suffix identify?
QST lists QE101I as industrial grade, -20°C to +85°C.
Can the site package name replace the QST drawing?
No. Confirm pad geometry and the manufacturer's recommended footprint before PCB release.
Engineering Notice
Validate the selected supply band, clock source and load, output timing, four-pin micro-DFN footprint and system-level EMI with current QST documentation. The registered production package JPG returns 404 and requires correction and visual review before publication.
QE101I Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- QST
- Series:
- QE101
- Package/Case:
- 4-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- EMI Management IC
- Applications:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-µDFN (1x1)
- Grade:
- -
- Qualification:
- -
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