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HomeProductsCrystals, Oscillators, ResonatorsOscillatorsAX5PAF4-77.7600T
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AX5PAF4-77.7600T - Abracon LLC

Manufacturer Part Number
AX5PAF4-77.7600T
Manufacturer
Abracon
Allelco Part Number
98D-AX5PAF4-77.7600T
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
137,963 pcs available, New & Original
Parts Description
OSC XO 77.76MHZ 3.3V LVPECL
Package
8-SMD, No Lead
Data sheet
AX5PAF4-77.7600.pdf

Datasheets

AX5 Datasheet.pdf

Environmental Information

Abracon REACH.pdf
RoHs Status
ROHS3 Compliant
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In stock: 137963

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Specifications

AX5PAF4-77.7600T Tech Specifications
Abracon LLC - AX5PAF4-77.7600T technical specifications, attributes, parameters and parts with similar specifications to Abracon LLC - AX5PAF4-77.7600T

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 Tape & Reel (TR)
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 77.76 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)

What are the key performance characteristics of the AX5PAF4-77.7600T oscillator when used in high-speed clock distribution networks, and how does its LVPECL output compare to other differential signaling standards?
The AX5PAF4-77.7600T delivers a 77.76 MHz frequency with ±20 ppm stability over -40°C to 85°C operation, making it suitable for precision timing applications such as clock recovery and synchronization in high-speed serial links. Its LVPECL (Low-Voltage Positive Emitter-Coupled Logic) output provides superior noise immunity and lower electromagnetic interference compared to HCSL or CML outputs, particularly beneficial in environments with tightly packed PCBs where crosstalk is a concern. LVPECL’s controlled slew rates and differential signaling reduce ground bounce and enable longer trace lengths at high frequencies. When compared to LVDS, LVPECL offers higher output swing, which improves signal integrity over greater distances but consumes more power—typically around 110 mA supply current. For designs requiring minimal jitter and robust clocking at 77.76 MHz, this component balances performance, size, and reliability.
How does the AX5PAF4-77.7600T support system-level power management in FPGA-based designs, and what considerations apply when integrating its enable/disable function into dynamic voltage scaling architectures?
The AX5PAF4-77.7600T includes an active-low enable pin that allows dynamic control of the oscillator output, enabling designers to shut down clock generation during low-power states in FPGA systems. When disabled, the device draws less than 100 mA, significantly reducing quiescent power consumption in standby modes. This feature supports energy-efficient design practices by allowing the host processor to disable unused clock domains without requiring hardware resets or external clock gating circuits. However, care must be taken to ensure that enable transitions do not introduce glitches on the clock line, as abrupt shutdowns can cause metastability in downstream flip-flops. Proper sequencing—such as disabling the oscillator only after associated logic has entered a safe state—is essential. Additionally, the 3.3V supply requirement must align with the FPGA’s I/O bank voltage levels to avoid level-shifting overhead.
In what scenarios would the AX5PAF4-77.7600T be preferred over alternative crystal oscillators like those using fundamental-mode crystals versus third-overtone designs, particularly in space-constrained embedded systems?
The AX5PAF4-77.7600T utilizes a standard fundamental-mode crystal resonator, which is optimal for frequencies near 77.76 MHz since overtone crystals typically operate at harmonic multiples and require precise load capacitance matching. Using a fundamental-mode design simplifies PCB layout by reducing the need for additional tuning components and minimizes phase noise at this frequency. Third-overtone alternatives might offer better frequency accuracy but often suffer from higher series resistance and reduced Q-factor, leading to degraded startup time and increased jitter. Given the AX5PAF4’s small 5.00mm x 3.20mm footprint and RoHS compliance, it is well-suited for compact embedded systems—such as wireless baseband processors or industrial automation controllers—where board real estate and thermal dissipation are limited. Its ClearClock™ architecture further enhances reliability by compensating for temperature-induced drift within the specified ±20 ppm window.
How does the AX5PAF4-77.7600T handle temperature-induced frequency variation across its operating range, and what design mitigations should be considered when deploying it in automotive or outdoor equipment?
Across its full operating temperature span of -40°C to 85°C, the AX5PAF4-77.7600T maintains frequency stability within ±20 ppm, ensuring consistent timing behavior even under thermal stress. This level of precision is critical in mission-sensitive applications like automotive sensor nodes or outdoor telemetry units exposed to rapid ambient changes. While internal compensation mechanisms help stabilize output, designers should still implement thermal management strategies such as localized heatsinking or airflow design to prevent localized hotspots that could exacerbate long-term drift. Additionally, decoupling capacitors placed close to the VCC pin—typically 100 nF ceramic types rated for 6.3V or higher—are recommended to filter supply noise that may interact with temperature-related parametric shifts. Although the datasheet does not specify Absolute Pull Range (APR), maintaining clean power delivery remains essential for preserving stated stability performance.
Can the AX5PAF4-77.7600T replace legacy PECL oscillators in existing 3.3V systems, and what interface compatibility issues should be evaluated before migration?
Yes, the AX5PAF4-77.7600T can serve as a direct replacement for many legacy PECL oscillators in 3.3V systems due to its LVPECL output and identical supply voltage requirement. However, LVPECL differs from standard PECL in several key ways: LVPECL operates with lower voltage swings (approximately 0.9V vs. 1.7V differential) and references a 1.9V common-mode voltage, whereas traditional PECL uses a 2.5V reference. Migrating from PECL requires verifying that downstream receivers support LVPECL input thresholds; otherwise, level translation may be needed. Also, LVPECL drivers typically have higher output impedance, so termination resistors (usually 50Ω to VCC minus 0.3V) must be carefully matched to maintain signal integrity. Despite these nuances, the AX5PAF4’s integrated enable feature and compact SMD package offer advantages over older through-hole PECL devices, making it a viable modernization choice provided receiver compatibility is confirmed.
What are the implications of mounting the AX5PAF4-77.7600T via surface mount technology on high-frequency signal paths, and how does its package geometry influence EMI and layout parasitics?
As an 8-SMD, no-lead device measuring 5.00mm x 3.20mm, the AX5PAF4-77.7600T benefits from reduced lead inductance and improved thermal conductivity compared to gull-wing packages. Its small form factor minimizes loop area between the oscillator and decoupling capacitors, lowering parasitic inductance and improving high-frequency response. Proper PCB layout dictates placing decoupling capacitors within 1–2 mm of the VCC and GND pins to suppress transient noise that could affect frequency stability. The short leads also reduce susceptibility to radiated emissions at 77.76 MHz, helping meet regulatory standards like FCC Part 15 or EN 55032. However, care must be taken to avoid routing sensitive traces underneath the oscillator, as ground plane cuts or adjacent high-current paths can introduce coupling. Thermal vias under the package enhance heat dissipation but should not compromise signal return paths for the LVPECL outputs.
How does the Moisture Sensitivity Level (MSL) rating of 1 for the AX5PAF4-77.7600T simplify manufacturing logistics, and what precautions are still necessary during wave soldering or reflow processes?
With an MSL rating of 1, the AX5PAF4-77.7600T is classified as moisture-insensitive and can withstand unlimited storage time at standard conditions without baking prior to assembly. This eliminates the need for humidity-controlled environments or pre-drying steps before reflow, streamlining production scheduling and reducing handling costs. Nevertheless, during reflow profiling, peak temperatures must remain below the component’s maximum junction temperature (not explicitly listed but inferred from typical crystal oscillator limits of ~125°C). A typical lead-free profile with a peak of 245°C for 30–45 seconds is acceptable if ramp rates are kept moderate to avoid mechanical stress on the crystal element. Similarly, hand soldering operations should use low-temperature irons (<350°C) and brief contact times to preserve internal resonator integrity. These measures ensure long-term reliability despite the convenience afforded by MSL 1 classification.
In comparison to alternative oscillators such as MEMS-based VCXOs, what advantages does the AX5PAF4-77.7600T offer in terms of long-term drift and shock resistance for industrial control applications?
Unlike MEMS-based voltage-controlled crystal oscillators (VCXOs), which may exhibit microphonic sensitivity and gradual frequency aging due to electrostatic forces and material creep, the AX5PAF4-77.7600T leverages a traditional quartz crystal resonator known for exceptional long-term stability and mechanical robustness. Quartz crystals demonstrate sub-ppm/year aging rates under stable conditions, outperforming most MEMS solutions in drift metrics over years of continuous operation. Moreover, the absence of moving parts makes the AX5PAF4 inherently resistant to vibration and physical shock—critical attributes in industrial motor drives, robotics, or transportation electronics where environmental harshness is prevalent. While MEMS oscillators offer broader tuning ranges and faster startup, they often trade off long-term accuracy and resilience. For fixed-frequency, high-reliability applications at 77.76 MHz, the AX5PAF4 provides a proven, cost-effective solution with predictable performance across its operational lifespan.

Parts with Similar Specifications

The three parts on the right have similar specifications to Abracon LLC AX5PAF4-77.7600T

Product Attribute AX5PAF4-77.7600C AX5PAF4-77.7600 AX5PAF4-781.2500T AX5PAF4-780.0000T
Part Number AX5PAF4-77.7600C AX5PAF4-77.7600 AX5PAF4-781.2500T AX5PAF4-780.0000T
Manufacturer Abracon LLC Abracon LLC Abracon LLC Abracon LLC
Function - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Frequency Stability - - - -
Series - - - -
Type - - - -
Absolute Pull Range (APR) - - - -
Size / Dimension - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Voltage - Supply - - - -
Current - Supply (Disable) (Max) - - - -
Current - Supply (Max) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Output - - - -
Ratings - - - -
Base Resonator - - - -
Frequency - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Height - Seated (Max) - - - -

AX5PAF4-77.7600T Datasheet PDF

Download AX5PAF4-77.7600T pdf datasheets and Abracon LLC documentation for AX5PAF4-77.7600T - Abracon LLC.

Datasheets
AX5 Datasheet.pdf
Environmental Information
Abracon REACH.pdf

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Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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Region Country Logistic Time(Day)
America United States 5
Brazil 7
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United Kingdom 4
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New Zealand 5
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Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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AX5PAF4-77.7600T Image

AX5PAF4-77.7600T

Abracon LLC
98D-AX5PAF4-77.7600T

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