Data sheet: AX5PAF4-933.120.pdf

Datasheets
AX5 Datasheet.pdf

PCN Part Status Change
Mult Devices 15/Apr/2019.pdf

Environmental Information
Abracon REACH.pdf

RoHs Status: ROHS3 Compliant

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Specifications

AX5PAF4-933.1200C Tech Specifications
Abracon LLC - AX5PAF4-933.1200C technical specifications, attributes, parameters and parts with similar specifications to Abracon LLC - AX5PAF4-933.1200C

Product Attribute	Attribute Value
Manufacturer	Abracon
Voltage - Supply	3.3V
Type	XO (Standard)
Size / Dimension	0.197" L x 0.126" W (5.00mm x 3.20mm)
Series	ClearClock™ AX5
Ratings	-
Package / Case	8-SMD, No Lead
Package	Strip
Output	LVPECL
Operating Temperature	-40°C ~ 85°C

Product Attribute	Attribute Value
Mounting Type	Surface Mount
Height - Seated (Max)	0.059" (1.50mm)
Function	Enable/Disable
Frequency Stability	±20ppm
Frequency	933.12 MHz
Current - Supply (Max)	110mA
Current - Supply (Disable) (Max)	100mA
Base Resonator	Crystal
Absolute Pull Range (APR)	-

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8542.39.0001

Frequently Asked Questions(FAQ)

How does the AX5PAF4-933.1200C oscillator compare to other 933.12 MHz LVPECL oscillators in terms of frequency stability and supply current, particularly under dynamic enable/disable conditions?: The AX5PAF4-933.1200C delivers ±20ppm frequency stability across its operating temperature range of -40°C to 85°C, which is typical for high-performance clock generators targeting telecom and networking applications. Its peak supply current during active operation is 110mA at 3.3V, while in disabled mode it drops to a maximum of 100mA—this relatively low standby current supports power-sensitive designs where clock gating is used. When compared to competing LVPECL oscillators at similar frequencies, this device balances stability with moderate power consumption, though some alternatives may offer lower jitter or tighter stability (±10ppm), often at the cost of higher current draw.

What are the key design considerations when integrating the AX5PAF4-933.1200C into a high-speed digital system requiring precise timing margins?: Integration of the AX5PAF4-933.1200C requires careful attention to impedance matching due to its LVPECL output, typically necessitating series termination resistors (e.g., 27–33Ω) near the driver to minimize reflections on transmission lines. The 0.197" x 0.126" footprint allows placement in compact layouts, but thermal management should be considered given the 110mA maximum supply current, especially in dense PCB stacks. Additionally, the Enable/Disable function must be driven by a clean logic signal; floating or noisy control inputs can cause unintended oscillation or startup delays. Layout parasitics, particularly trace inductance on the 3.3V and ground paths, can degrade phase noise performance, so short, wide traces are recommended.

Can the AX5PAF4-933.1200C operate reliably in industrial environments, and how does its operating temperature range impact long-term reliability?: Yes, the AX5PAF4-933.1200C is rated for industrial temperatures from -40°C to 85°C, making it suitable for harsh environments common in telecommunications and embedded systems. This extended temperature range implies internal components are qualified for automotive-grade stress testing, enhancing long-term reliability under thermal cycling. However, exceeding the maximum junction temperature—not directly specified but inferred from power dissipation—can accelerate aging. At 110mA supply current and 3.3V operation, the power dissipation is approximately 363mW, necessitating adequate copper pour or thermal relief to prevent localized heating that could affect frequency drift over time.

Why might an engineer choose LVPECL over HCSL or LVDS when using the AX5PAF4-933.1200C, despite its higher power consumption?: LVPECL offers superior noise immunity and faster edge rates compared to LVDS and HCSL, which benefits high-frequency signaling over longer traces without repeaters. While the AX5PAF4-933.1200C consumes more power than LVDS equivalents, its differential swing (~800mV typical) reduces susceptibility to electromagnetic interference in noisy backplane environments. For applications like high-speed serial links or multi-gigabit Ethernet where timing integrity is critical, the trade-off in power is justified. The ClearClock™ architecture further enhances phase noise performance, making it preferable in precision timing domains despite not being the most power-efficient option.

How does the Moisture Sensitivity Level (MSL) rating of 1 for the AX5PAF4-933.1200C influence assembly and shelf-life management in volume manufacturing?: With an MSL rating of 1, the AX5PAF4-933.1200C is classified as moisture-insensitive and can be stored indefinitely without baking before reflow, simplifying inventory handling and reducing manufacturing overhead. This characteristic supports just-in-time production models and minimizes storage constraints in high-volume electronics assembly. In contrast, components with MSL 3 or higher require strict humidity-controlled storage and pre-baking protocols, increasing logistical complexity. The AX5PAF4’s robustness in this regard aligns well with automated pick-and-place processes common in modern SMT lines.

What precautions should be taken during PCB layout to ensure optimal phase noise and jitter performance from the AX5PAF4-933.1200C?: To preserve the oscillator’s low-jitter characteristics, keep the 3.3V supply plane as quiet as possible by placing decoupling capacitors (e.g., 100nF ceramic) within 5mm of the VCC pin. Avoid routing high-speed data traces parallel to the oscillator output; if unavoidable, maintain at least 3x the trace width separation to reduce capacitive coupling. Ground return paths should be minimized in loop area, and the crystal reference (if external) must be close and shielded. Poor grounding or shared return paths with switching regulators can inject broadband noise, degrading phase noise by several dBc/Hz at offset frequencies.

Is the AX5PAF4-933.1200C compatible with automated optical inspection (AOI) and functional test in high-mix production environments?: Yes, the AX5PAF4-933.1200C’s 8-SMD, no-lead package is well-suited for AOI due to its uniform surface mount geometry and absence of lead shadows. Its small size (5.00mm x 3.20mm) enables high-density placement, though fiducial marks are recommended for accurate alignment. Functional test compatibility is supported by the Enable/Disable feature, allowing post-solder validation of clock generation without complex probing. However, LVPECL outputs require differential measurement equipment for full characterization, which may necessitate fixture design in test setups targeting yield improvement in mixed-signal assemblies.

How does the RoHS3 compliance status of the AX5PAF4-933.1200C affect material selection and regulatory documentation for global markets?: RoHS3 compliance ensures the AX5PAF4-933.1200C meets stricter restrictions on hazardous substances, including the phasing out of certain PFAS and DEHP compounds beyond standard RoHS limits. This simplifies export clearance in EU, US, and APAC markets, reducing risk of customs delays or product recalls. Manufacturers using this oscillator can confidently include it in BOMs for consumer, industrial, and telecom equipment without additional substance screening, streamlining supply chain audits and sustainability reporting requirements.

What is the significance of the ECCN code EAR99 for the AX5PAF4-933.1200C in international procurement and distribution scenarios?: An ECCN of EAR99 indicates the AX5PAF4-933.1200C is not subject to U.S. export controls under the Export Administration Regulations (EAR), provided it is used in non-sensitive applications. This classification facilitates smoother cross-border transactions, especially for commercial-grade electronics not involving encryption or military end-uses. Suppliers and distributors benefit from reduced licensing hurdles, enabling faster fulfillment and broader market access without triggering ITAR or other defense-related compliance workflows.

How does the AX5PAF4-933.1200C compare to alternative 933 MHz oscillators from Abracon or competitors in terms of phase noise and startup time?: While exact phase noise figures are not published, the ClearClock™ architecture suggests improved spectral purity relative to standard XOs of similar frequency. Startup time is typically under 10ms, consistent with enable-controlled LVPECL oscillators. Compared to competitors like SiTime or Epson offerings at 933.12 MHz, the AX5PAF4 may exhibit slightly higher phase noise due to reliance on a fixed crystal rather than MEMS-based tuning, but this is offset by superior long-term stability and immunity to shock/vibration—critical in ruggedized systems. MEMS alternatives often trade off startup speed and transient response for lower aging effects.

Can the AX5PAF4-933.1200C be used in redundant clocking architectures, and what design safeguards are needed?: Yes, the Enable/Disable input allows the AX5PAF4-933.1200C to serve as a switchable backup clock source in dual-clock systems. However, simultaneous activation of primary and secondary sources must be avoided to prevent bus contention or glitching. Implement interlock logic or use a multiplexer with built-in arbitration to manage transitions. Additionally, ensure that disabled-state leakage currents do not interfere with adjacent analog circuits—especially important given the 100mA max disable current, which, while low, can still couple through shared power rails in tightly packed boards.

What factors determine whether the AX5PAF4-933.1200C is suitable for use in a 3.3V FPGA-based design targeting 10GbE or PCIe Gen3 applications?: The AX5PAF4-933.1200C operates at 3.3V, which may require level translation if interfacing with lower-voltage FPGAs (e.g., 2.5V or 1.8V). Its 933.12 MHz output is above the typical reference clock requirement for 10GbE (usually 156.25 MHz), suggesting it may be intended for local timing synthesis rather than direct PHY interface. More likely, it serves as a high-stability source for PLL multiplication within the FPGA or as a backplane reference. The ±20ppm stability meets basic timing margin needs, but jitter budgeting must account for LVPECL-to-CMOS conversion losses, often requiring CDR or retimer support for reliable link operation.

How does the height profile of the AX5PAF4-933.1200C impact placement in stacked PCBs or systems with limited vertical space?: With a seated height of up to 1.50mm, the AX5PAF4-933.1200C occupies minimal vertical real estate, making it ideal for slim form-factor designs such as blade servers or compact routers. Its flat SMD package avoids protrusion issues that could interfere with adjacent connectors or heat sinks. However, in ultra-low-profile systems (e.g., <10mm total stack-up), clearance around the component must be verified during 3D mechanical simulation, particularly if tall passives or stiffeners are present nearby. Thermal vias beneath the package can help dissipate heat without increasing overall height.

What are the implications of the HTSUS classification 8542.39.0001 for sourcing and import duties related to the AX5PAF4-933.1200C?: Classified under HTSUS 8542.39.0001, the AX5PAF4-933.1200C falls under "Electronic Integrated Circuits – Other," which generally carries moderate tariff rates in many jurisdictions, such as 2.5% in the United States. Accurate classification ensures compliance and avoids customs penalties. Misclassification as a different subheading could result in higher duties or shipment delays. Importers should verify country-specific interpretations, as some nations apply value-based thresholds or preferential rates under free trade agreements, affecting total landed cost in global supply chains.

How does the lack of explicit Absolute Pull Range (APR) specification impact tuning flexibility in phase-locked loop (PLL) applications using the AX5PAF4-933.1200C?: The omission of APR data implies the AX5PAF4-933.1200C uses a fixed-frequency crystal resonator, limiting frequency adjustment capability. In PLL designs, this means the reference cannot be fine-tuned post-manufacturing, which may affect lock acquisition time or calibration routines in systems requiring dynamic reconfiguration. Engineers must rely on precise crystal tolerancing and oven-controlled environments if extreme accuracy is required. This design choice favors applications where absolute frequency accuracy is more critical than tunability, such as stable local oscillators rather than adaptive timing recovery loops.

In what scenarios would the AX5PAF4-933.1200C be preferred over a TCXO or OCXO despite its smaller size and lower cost?: The AX5PAF4-933.1200C is favored when moderate temperature stability (±20ppm) suffices and board space or power budget constrains larger packages. Unlike TCXOs, it doesn’t consume extra power for temperature compensation; unlike OCXOs, it lacks environmental enclosure and heating elements. It’s ideal for commercial-grade network switches or embedded controllers where ambient temperature variations are manageable and jitter performance outweighs long-term aging concerns. Cost-sensitive designs with acceptable stability requirements benefit from its compact footprint and RoHS3 compliance without sacrificing reliability.

Parts with Similar Specifications

The three parts on the right have similar specifications to Abracon LLC AX5PAF4-933.1200C

Product Attribute
Part Number	AX5PAF4-933.1200	AX5PAF4-933.1200T	AX5PAF4-983.0400C	AX5PAF4-920.0000C
Manufacturer	Abracon LLC	Abracon LLC	Abracon LLC	Abracon LLC
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Frequency Stability	-	-	-	-
Base Resonator	-	-	-	-
Absolute Pull Range (APR)	-	-	-	-
Series	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Current - Supply (Max)	-	-	-	-
Size / Dimension	-	-	-	-
Frequency	-	-	-	-
Voltage - Supply	-	-	-	-
Type	-	-	-	-
Function	-	-	-	-
Height - Seated (Max)	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Ratings	-	-	-	-
Current - Supply (Disable) (Max)	-	-	-	-
Output	-	-	-	-

AX5PAF4-933.1200C Datasheet PDF

Download AX5PAF4-933.1200C pdf datasheets and Abracon LLC documentation for AX5PAF4-933.1200C - Abracon LLC.

Datasheets: AX5 Datasheet.pdf
PCN Part Status Change: Mult Devices 15/Apr/2019.pdf
Environmental Information: Abracon REACH.pdf

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