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Infineon Technologies W181-51SZ — Clock & Timing ICs
Infineon Technologies

W181-51SZ Clock Generator, 75 MHz, Spread Spectrum, SOIC-8

MPNW181-51SZ
End of Life

Cypress W181-51SZ, Clock/Frequency Synthesizer with Spread Spectrum, PLL Yes, Input Clock/Crystal, Output CMOS, 75 MHz max, 3.135V-3.465V / 4.5V-5.5V supply, 1 circuit, 1:1 ratio, 0°C to 70°C, 8-SOIC package, Surface Mount, ROHS3.

$1.04Ref. price · indicative, final on quote
W181-51SZ datasheet
Packaging8-SOIC (0.154", 3.90mm Width)
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
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Specifications

W181-51SZ Technical Specifications
ParameterValue
TypeClock/Frequency Synthesizer, Spread Spectrum Clock Generator
Mounting typeSurface Mount
Voltage3.135V ~ 3.465V, 4.5V ~ 5.5V
Frequency75MHz
Operating temperature0°C ~ 70°C
PLLYes
InputClock, Crystal
OutputCMOS
PackageBulk
Case8-SOIC (0.154\", 3.90mm Width)
Divider (Multiplier)Yes/No
Number of circuits1
Ratio - Input:Output1:1
Differential - Input:OutputNo/No

Product details

Spread spectrum — what it does for the board

The spread-spectrum feature modulates the output frequency around the center frequency, spreading the radiated energy across a wider band. This lowers peak EMI amplitudes at the fundamental and harmonics, which can help a design pass FCC or CISPR radiated-emissions limits without adding ferrite beads or shielding cans. The modulation profile and deviation are set internally — no external programming pins. This is a set-and-forget EMI mitigation block for a single clock tree.

Lifecycle and sourcing

The W181-51SZ carries an active lifecycle status with ROHS3 compliance. The part is current-production, so BOM planners can freeze this line without imminent obsolescence risk.

Frequently asked questions

Can W181-51SZ be used with a 3.3V supply?

Yes. The W181-51SZ accepts a supply range of 3.135V to 3.465V, which covers the nominal 3.3V rail. It also accepts 4.5V to 5.5V for 5V designs, giving flexibility across mixed-voltage boards.

What is the maximum output frequency of W181-51SZ?

The maximum output frequency is 75 MHz, delivered as a CMOS-level signal from the single output. The integrated PLL synthesizes this from the clock or crystal input.

Is there a functional equivalent or cross-reference for W181-51SZ?

A close functional peer is the CY2305SXI-1HT from Cypress. Both integrate a PLL and generate clock outputs, but the CY2305SXI-1HT offers a 1:5 fanout ratio (five outputs) versus the W181-51SZ's single output, and it is rated for the industrial temperature range (-40°C to 85°C) versus the W181-51SZ's commercial 0°C to 70°C range. The CY2305SXI-1HT also operates from a fixed 3.0V supply, while the W181-51SZ accepts both 3.3V and 5V rails. For designs needing multiple clock outputs or wider temperature tolerance, the CY2305SXI-1HT is a valid alternative; for single-output, dual-supply application