SIT9002AI-432N33EQ200.00000Z - 200 MHz HCSL Spread-Spectrum XO | 6-SMD
Référence : SIT9002AI-432N33EQ200.00000Z ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $8.96 | $8,96 |
| 10 | $8.21 | $82,10 |
| 100 | $7.12 | $712,00 |
| 500 | $6.2 | $3 100,00 |
| 1 000 | $5.45 | $5 450,00 |
SIT9002AI-432N33EQ200.00000Z Présentation
Spread-spectrum clocking is a technique used to reduce peak electromagnetic interference (EMI) by modulating the output frequency over a wide band, lowering the fundamental tone-of-frequency amplitude measured in dBµV/m. The SIT9002 supports both center-spread and down-spread modes with programmable spread percentages, allowing system designers to meet stringent EMI compliance targets without adding shielding or filtering. As a programmable SiTime part, this device is built on a silicon MEMS resonator rather than a quartz crystal, providing superior shock and vibration resistance and eliminating the start-up reliability issues common to traditional crystal oscillators.
Key electrical features of the SIT9002 family include: ±50 ppm total frequency stability across the full industrial temperature range (-40 °C to +85 °C), low jitter differential outputs suitable for PCI Express Gen-1 reference applications, and integrated Enable/Disable pin (pin 1) for power management. The HCSL output format is reference-terminated at the receiver and is commonly used for chip-to-chip clocking on PCI Express, Serial ATA, and RapidIO interfaces. Unlike LVPECL which requires external biasing, HCSL simplifies board design by allowing a source-terminated series resistor at the driver output.
Typical applications include PCI Express expansion cards and chipsets, server and storage area networking clock distribution, industrial controllers with EMI-sensitive enclosures, and SATA/SAS storage interfaces. The wide programmable frequency range (1 to 220 MHz) and four programmable pin shapes (LVPECL/LVDS/CML/HCSL) make the SIT9002 family a flexible platform for designers who want a single BOM line that covers multiple frequency plans and output standards.
When designing with this part, ensure the load capacitors specified in the datasheet are placed close to the receiver, and that the HCSL source-termination resistor (typically 33 Ω) is selected per the SiTime reference schematic. For best EMI performance, use the down-spread mode with at least ±0.25 % spread percentage, which typically reduces measured EMI by 7-10 dB on the fundamental. This page synthesizes distributor pricing, drop-in alternative MPNs, and application-specific design notes not found in the manufacturer datasheet itself.
Alternatives de remplacement direct pour SIT9002AI-432N33EQ200.00000Z — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
SIT9002AI-432N33DB100.00000
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SIT9002AI-432N33DB100.00000T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SIT9002AI-432N33DO100.00000
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SIT9002AI-43N33EQ
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SIT9002AI-43N33DO
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SIT9002AI-432N33EQ200.00000Z Spécifications
| Series | SiT9002 |
| Device Type | Programmable Spread-Spectrum Differential Oscillator |
| Base Part Number | SIT9002 |
| Frequency | 200.000000 MHz |
| Frequency Stability | ±50 ppm |
| Plage de température de fonctionnement | -40 °C to +85 °C (Industrial) |
| Type de sortie | HCSL (programmable differential) |
| Tension d'alimentation | 3.3 V |
| Programmable Frequency Range | 1 MHz to 220 MHz |
| Programmable Output Signaling | LVPECL, LVDS, CML, HCSL |
| Spread Spectrum | Yes (center or down spread, programmable %) |
| Enable / Disable Pin | Yes (Pin 1) |
| Boîtier / Format | 6-SMD, No Lead (5.0 x 3.2 mm) |
| Type de montage | Surface Mount |
| Resonator Technology | Silicon MEMS |
| Statut RoHS | RoHS Compliant (per distributor listings) |
| Lead Free | Yes (per distributor listings) |
Configuration des broches de SIT9002AI-432N33EQ200.00000Z
| Broche 1 | EN/NC — Enable (logic high) or No Connect depending on E/blank suffix |
| Broche 2 | GND — Ground |
| Broche 3 | OUT — HCSL output (true) |
| Broche 4 | OUTN — HCSL complementary output |
| Broche 5 | NC — Not connected (per datasheet) |
| Broche 6 | VDD — Power supply (3.3 V) |
Applications typiques
SIT9002AI-432N33EQ200.00000Z convient pour 6 applications: PCI Express Reference Clock, SATA / SAS Storage Controller Clocking, Industrial Embedded Controller Clock Tree, Networking Switch / Router Clock Distribution, Server Motherboard Clock Buffering, Test and Measurement Instrumentation.
PCI Express Reference Clock
Provides a 100/200 MHz HCSL reference clock for PCI Express Gen-1/Gen-2 endpoint devices, root complexes, and switch chipsets. The SIT9002AI-432N33EQ200.00000Z's HCSL differential output and 3.3 V supply match the PCIe CEM specification for reference clocking, while spread-spectrum modulation (±0.25 % typical) reduces EMI by 7-10 dB on the fundamental. Placed near the PCIe PHY clock input with source-termination resistors (33 Ω typical) and a 0.1 µF bypass cap on VDD, this oscillator eliminates the discrete spread-spectrum IC + crystal combination that older designs required. Designers should verify pin-1 logic (Enable/Disable vs Standby) against the PHY's clock-request polarity.
Recommandé
SATA / SAS Storage Controller Clocking
Drives the reference clock input on SATA host controllers, SAS expanders, and storage processor ASICs requiring 100 MHz or 150 MHz HCSL differential reference. The SIT9002AI-432N33EQ200.00000Z factory-programmed at 200 MHz provides headroom for clock-multiplication inside the SATA PHY to derive the 150 MHz internal rate, while spread-spectrum reduces radiated emissions from the SATA cable connector. Power dissipation is low (under 50 mW quiescent per SiTime datasheet), simplifying thermal budgets in sealed drive enclosures. The 6-SMD No Lead package fits standard 2.5-inch and 3.5-inch HDD/SSD PCB land patterns used by the storage industry.
Recommandé
Industrial Embedded Controller Clock Tree
Provides the system reference clock for industrial PLCs, programmable logic controllers, and ruggedized embedded controllers requiring differential signaling to reject common-mode noise on long PCB traces. The SIT9002AI-432N33EQ200.00000Z's industrial temperature range (-40 °C to +85 °C) and silicon MEMS resonator technology give superior shock and vibration immunity compared to quartz-based oscillators in factory automation equipment. HCSL differential output rejects the common-mode EMI from adjacent motor-drive and relay-switching circuits, while spread-spectrum modulation helps the controller pass CE and FCC EMI compliance testing without additional shielding.
Recommandé
Networking Switch / Router Clock Distribution
Distributes the reference clock for Ethernet switch ASICs, network processors, and PHY transceivers in carrier-grade and enterprise networking equipment. The SIT9002AI-432N33EQ200.00000Z's HCSL output at 156.25 MHz / 200 MHz provides the precise reference required for SyncE and 10G Ethernet PHY clock recovery loops, while spread-spectrum modulation reduces PCB-level EMI that would otherwise interfere with adjacent RF antennas or high-speed SerDes lanes. The 3.3 V supply matches legacy telecom backplane rails. Enable/Disable pin (E variant) supports energy-efficient Ethernet (EEE) clock-gating for power saving during idle periods.
Recommandé
Server Motherboard Clock Buffering
Sources the 100/200 MHz HCSL reference clock for server motherboards feeding multiple PCIe slots, BMC (baseboard management controller), and platform clock buffers. The SIT9002AI-432N33EQ200.00000Z's high-frequency precision (±50 ppm stability) and MEMS-based reliability make it a fit for 24/7 server uptime requirements, eliminating the crystal-aging drift that affects quartz oscillators after several years of continuous operation. Spread-spectrum modulation lowers platform EMI near the chassis openings, helping the system meet Class A EMI limits without adding shielding cans. The 6-SMD No Lead package reflows cleanly on standard server PCB assembly lines.
Recommandé
Test and Measurement Instrumentation
Provides a clean, low-jitter reference clock for oscilloscopes, spectrum analyzers, signal generators, and bench-top test equipment requiring precise frequency references. The SIT9002AI-432N33EQ200.00000Z's programmable 1-220 MHz range supports multiple test frequencies in a single BOM line, while the MEMS resonator provides better long-term frequency stability than aging quartz crystals. The Enable/Disable pin allows the test instrument firmware to gate the clock during power-saving idle modes. Spread-spectrum mode is typically disabled in T&M applications to maintain a clean fundamental tone, but the platform flexibility lets the same part serve both EMI-test and reference-clock roles.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour SIT9002AI-432N33EQ200.00000Z — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | SIT9002AI-432N33DB100.00000 | SIT9002AI-432N33DB100.00000T | SIT9002AI-432N33DO100.00000 | SIT9002AI-43N33EQ | SIT9002AI-43N33DO |
|---|---|---|---|---|---|---|
| Package | 6-SMD, No Lead (5.0 x 3.2 mm) | 6-SMD, No Lead (5.0 x 3.2 mm) | 6-SMD, No Lead (5.0 x 3.2 mm) | 6-SMD, No Lead (5.0 x 3.2 mm) | 6-SMD, No Lead (5.0 x 3.2 mm) | 6-SMD, No Lead (5.0 x 3.2 mm) |
| Brand | SiTime | SiTime | SiTime | SiTime | SiTime | SiTime |
| Output Frequency | 200.000 MHz | 100.000 MHz | 100.000 MHz | 100.000 MHz | 1-220 MHz programmable | 1-220 MHz programmable |
| Output Type | HCSL | HCSL | HCSL | HCSL | HCSL | HCSL |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Frequency Stability | ±50 ppm | ±50 ppm | ±50 ppm | ±50 ppm | ±50 ppm | ±50 ppm |
| Pin 1 Function | Enable (E) | Standby (DB) | Standby (DB) | Standby/Disable (DO) | Enable (E) | Standby/Disable (DO) |
| Spread Spectrum | Yes (programmable %) | Yes (±0.25 %) | Yes (±0.25 %) | Yes (programmable %) | Yes (programmable %) | Yes (programmable %) |
Principaux différenciateurs
- Industry's first programmable spread-spectrum differential oscillator (vs Traditional quartz-based differential oscillators)
- Silicon MEMS resonator with superior shock/vibration immunity (vs Conventional quartz-crystal oscillators)
- Integrated spread-spectrum EMI reduction (vs Discrete crystal + external spread-spectrum clock modulator IC)
Notes de conception
Place the SIT9002AI-432N33EQ200.00000Z as close as possible to the receiver clock input pin to minimize trace length and impedance discontinuities. Use a 4-layer PCB with a continuous ground plane under the oscillator, and route the HCSL differential pair (OUT/OUTN) with 100 Ω differential impedance and 0.1 µF + 10 µF decoupling on VDD (Pin 6) within 1-2 mm of the package. Source-terminate each HCSL output with a 33 Ω resistor in series at the driver side; this matches the SiTime reference schematic and minimizes reflections on the differential pair.
HCSL is reference-terminated at the receiver with a 50 Ω resistor to GND on each line, NOT source-terminated with a parallel 50 Ω to VDD as LVPECL requires. This simplifies the receiver side but means the source-side series resistor is required to limit edge-rate and dampen reflections. Match the differential pair length to within 150 mil (±0.5 mm) per the SiTime datasheet reference layout; length mismatch above 5 mm introduces duty-cycle distortion visible as PCI Express reference clock jitter above the PCIe CEM specification.
The SIT9002AI-432N33EQ200.00000Z dissipates under 50 mW at 3.3 V supply under typical operating conditions (per SiTime datasheet typical characteristics). The 6-SMD No Lead (5.0 x 3.2 mm) package exposes the thermal pad (GND, Pin 2) as the primary heat path; a continuous ground plane directly beneath the package provides adequate heat sinking for industrial -40 °C to +85 °C operation. No external heatsink is required for normal use, but designers should avoid placing large hot components (linear regulators, power MOSFETs) within 5 mm of the oscillator to prevent frequency drift from thermal coupling.
Do not substitute a -D (Standby/Disable) variant for an -E (Enable) variant without verifying your downstream receiver's clock-request logic polarity. SiTime's pin-1 logic differs by suffix (E = Enable high to run, D = Standby low to run); cross-wiring Pin 1 polarity will either leave the oscillator permanently off or permanently on. Also, do not assume the 6-SMD land pattern is pin-compatible with quartz 6-SMD oscillator footprints from other vendors - SiTime uses Pin 1 = EN, Pin 6 = VDD, while some legacy quartz parts use Pin 1 = VDD, Pin 6 = EN. Always cross-check the SiTime datasheet land pattern against your board footprint before PCB layout.
Informations de conformité
RoHS compliant and lead-free per distributor listings (Heisener, BesenChips). Reach, halogen-free, and conflict minerals status not stated in verified web data. AEC-Q100 not applicable - industrial temperature grade per AI suffix.
