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HomeProductsCrystals, Oscillators, ResonatorsOscillatorsASD1-1.544MHZ-LR-T
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ASD1-1.544MHZ-LR-T - Abracon LLC

Manufacturer Part Number
ASD1-1.544MHZ-LR-T
Manufacturer
Abracon
Allelco Part Number
98D-ASD1-1.544MHZ-LR-T
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
159,280 pcs available, New & Original
Parts Description
XTAL OSC XO 1.5440MHZ HCMOS SMD
Package
4-SMD, No Lead
Data sheet
ASD1-1.544MHZ-L.pdf

3D Drawings

ASD.pdf.pdf

Environmental Information

Cylindrical Battery Holders.pdf
RoHs Status
ROHS3 Compliant
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In stock: 159280

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Specifications

ASD1-1.544MHZ-LR-T Tech Specifications
Abracon LLC - ASD1-1.544MHZ-LR-T technical specifications, attributes, parameters and parts with similar specifications to Abracon LLC - ASD1-1.544MHZ-LR-T

Product Attribute Attribute Value
Manufacturer Abracon
Voltage - Supply 3V
Type XO (Standard)
Size / Dimension 0.098' L x 0.079' W (2.50mm x 2.00mm)
Series ASD
Ratings -
Package / Case 4-SMD, No Lead
Package Tape & Reel (TR)
Output HCMOS
Operating Temperature -40°C ~ 85°C
Product Attribute Attribute Value
Mounting Type Surface Mount
Height - Seated (Max) 0.039' (1.00mm)
Function Enable/Disable
Frequency Stability ±25ppm
Frequency 1.544 MHz
Current - Supply (Max) 4mA
Current - Supply (Disable) (Max) 20µA
Base Resonator Crystal
Absolute Pull Range (APR) -

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) Not Applicable
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Frequently Asked Questions(FAQ)

What are the key performance characteristics of the ASD1-1.544MHZ-LR-T oscillator for use in telecommunications infrastructure applications?
The ASD1-1.544MHZ-LR-T operates at a nominal frequency of 1.544 MHz with HCMOS output logic, making it suitable for legacy telecom signaling and synchronization systems such as E1 line interfaces. Its frequency stability of ±25ppm over the industrial temperature range (-40°C to 85°C) ensures reliable clocking in environments subject to thermal variation. With a maximum supply current of 4mA during active operation and only 20µA when disabled, this device balances timing precision with power efficiency—critical for long-duration deployments. The 3V supply requirement aligns with common telecom equipment voltage rails, while its compact 2.5mm x 2.0mm footprint supports space-constrained PCB layouts.
How does the enable/disable functionality of the ASD1-1.544MHZ-LR-T impact system-level power management strategies?
The ASD1-1.544MHZ-LR-T features an active-low enable pin that allows software-controlled shutdown of the oscillator output. When disabled, the device consumes just 20µA compared to 4mA in normal operation, representing a 95% reduction in dynamic power draw. This capability enables designers to implement sleep modes in battery-powered or energy-sensitive embedded systems without requiring external switching components. However, users must account for startup time upon re-enabling, which can range from tens to hundreds of microseconds depending on load conditions, affecting real-time responsiveness in latency-critical applications.
What design considerations arise when integrating the ASD1-1.544MHZ-LR-T into a high-reliability telecom platform?
Due to its surface-mount package (4-SMD, no lead), the ASD1-1.544MHZ-LR-T requires careful layout attention around signal integrity and thermal dissipation. Maintaining adequate clearance from high-speed digital lines minimizes coupling-induced jitter, especially important given the ±25ppm stability specification. The device is rated for MSL Not Applicable, indicating robustness against moisture exposure but necessitating standard handling precautions during assembly. Additionally, decoupling capacitance placement near VDD and GND pins is essential to suppress transient noise that could degrade frequency accuracy over time.
Can the ASD1-1.544MHZ-LR-T be substituted directly for other 1.544 MHz oscillators in existing designs, and what compatibility issues might emerge?
While the ASD1-1.544MHZ-LR-T shares the same nominal frequency and voltage supply with many 1.544 MHz oscillators, direct substitution requires verification of several parameters beyond frequency and voltage. Output impedance, rise/fall times, and enable pin behavior differ across manufacturers; failure to match these can result in timing margin violations or logic level incompatibility. For example, some alternatives may lack enable functionality altogether, forcing reliance on external gating circuits. Furthermore, packaging dimensions and pinout alignment must be confirmed—the ASD1-1.544MHZ-LR-T uses a 2.50mm x 2.00mm footprint, so footprint migration may be needed even if electrical specs appear compatible.
What environmental and regulatory factors should engineers evaluate before selecting the ASD1-1.544MHZ-LR-T for mass production?
The ASD1-1.544MHZ-LR-T complies with RoHS3 and is REACH unaffected, simplifying compliance documentation for global markets including EU and North America. Its operating temperature range of -40°C to 85°C meets industrial-grade requirements but excludes extended automotive or military specifications where wider ranges are mandated. The ECCN classification (EAR99) indicates no export restrictions under U.S. regulations, facilitating international sourcing. However, designers should confirm supply chain continuity, as Abracon’s component availability may vary based on regional demand shifts or geopolitical factors affecting semiconductor distribution.
How does the frequency stability specification of ±25ppm for the ASD1-1.544MHZ-LR-T translate into actual timing accuracy over time and temperature?
A ±25ppm stability means the output frequency can deviate by up to 38.6 Hz from nominal (calculated as 1.544 MHz × 25 ppm = 38.6 Hz) across the full operating range. Over a 24-hour period, this equates to potential cumulative drift of approximately ±864 milliseconds if not corrected by calibration. In synchronous communication protocols like SONET/SDH, such drift could accumulate beyond allowable holdover limits unless managed through phase-locked loops or periodic resynchronization. Therefore, while adequate for basic E1 framing, higher-order systems may require stricter stability grades or disciplined oscillators for long-term reliability.
What trade-offs exist between using the ASD1-1.544MHZ-LR-T versus a TCXO or OCXO for E1 line generation?
The ASD1-1.544MHZ-LR-T offers lower cost and smaller size compared to TCXOs or OCXOs, but sacrifices superior frequency stability and aging performance. TCXOs typically achieve ±0.5ppm to ±2ppm stability and compensate for temperature variations actively, whereas the ASD1-1.544MHZ-LR-T relies solely on crystal-based tuning with passive compensation. OCXOs provide even tighter tolerances (±0.01ppm) but consume significantly more power and generate heat, making them impractical for low-power designs. For non-synchronized applications or short-duration operations, the ASD1-1.544MHZ-LR-T presents a reasonable balance of performance, size, and cost.
Are there known limitations regarding startup behavior or warm-up time when activating the ASD1-1.544MHZ-LR-T after prolonged disable periods?
Yes, the ASD1-1.544MHZ-LR-T exhibits typical crystal oscillator warm-up characteristics, where initial frequency accuracy may drift up to 10–20 ppm during the first few hundred microseconds after power-on or re-enable. This transient instability is inherent to quartz resonator dynamics and is not unique to this part number. Designers must ensure downstream circuits accommodate this brief instability window, particularly in systems requiring immediate lock detection or deterministic latency. Failure to do so may result in false synchronization events or data framing errors during boot sequences.
What layout practices minimize electromagnetic interference (EMI) when routing signals near the ASD1-1.544MHZ-LR-T?
To reduce EMI radiation and susceptibility, maintain a minimum distance of at least three times the trace width between the oscillator output and sensitive analog paths such as ADC inputs or low-noise amplifiers. Use ground planes beneath the oscillator package to contain return currents, and avoid routing digital control lines over the crystal resonator area. Since the ASD1-1.544MHZ-LR-T lacks shielding, uncontrolled emissions may radiate from the HCMOS output edges, especially at harmonics above 10 MHz. Implementing series termination resistors close to the load helps dampen reflections and reduces spectral spurs.
How should firmware interact with the enable pin of the ASD1-1.544MHZ-LR-T to prevent unintended oscillator disablement during critical operations?
Firmware controlling the enable pin must avoid rapid toggling, which can cause unstable startup transients or partial activation states. Instead, transitions should occur during known safe windows such as initialization phases or scheduled maintenance intervals. Additionally, pull-up or pull-down resistors (typically 10kΩ) are recommended on the enable pin to prevent floating states due to board leakage or electrostatic discharge. During power-up sequencing, ensure the enable signal stabilizes before asserting VDD to guarantee predictable boot behavior—failing to follow this sequence may result in undefined output states or excessive current draw from the ASD1-1.544MHZ-LR-T.
Is the ASD1-1.544MHZ-LR-T suitable for use in systems requiring low phase noise performance?
No, the ASD1-1.544MHZ-LR-T is classified as a standard XO (oscillator) rather than a low-phase-noise variant such as an LVPECL or sine-wave oscillator. As such, its phase noise profile follows typical crystal oscillator trends, with higher close-in phase noise compared to disciplined or oven-controlled alternatives. While acceptable for basic clocking in E1 systems, applications demanding precise timing margins—such as microwave backhaul synchronization or high-speed serial links—may experience jitter accumulation that degrades link budget performance. Designers should consult phase noise plots in the datasheet and simulate worst-case jitter contributions before finalizing system architecture.
What impact does supply voltage ripple have on the frequency accuracy of the ASD1-1.544MHZ-LR-T?
Although the ASD1-1.544MHZ-LR-T specifies operation at 3V, variations in supply voltage introduce minor frequency modulation proportional to the oscillator’s gain sensitivity. Empirical data suggests that ±100mV ripple can induce up to ±1 ppm of additional instability, compounding the base ±25ppm stability figure. This effect is exacerbated at higher ambient temperatures due to reduced Q-factor in the crystal resonator. To mitigate this, designers should implement local bypass capacitors (e.g., 100nF ceramic + 10µF tantalum) near the VDD pin, ensuring clean power delivery despite regulator imperfections or inductive drops in long traces.
How does the absence of an Absolute Pull Range (APR) parameter affect tuning flexibility in custom oscillator configurations using the ASD1-1.544MHZ-LR-T?
The missing APR value implies that the ASD1-1.544MHZ-LR-T is manufactured with a fixed crystal cut and load capacitance optimized for standard applications, leaving minimal room for external trimming via varactors or discrete capacitors. Unlike programmable oscillators with APR specifications, this device cannot be fine-tuned post-manufacture to correct frequency deviations caused by mismatched PCB parasitics or temperature gradients. Consequently, layout-induced load capacitance variations (typically 5–15 pF) must be carefully controlled during board design to avoid exceeding the ±25ppm tolerance envelope, limiting design margin for iterative development cycles.
What are the implications of the ASD1-1.544MHZ-LR-T’s small package size on manufacturing yield and reliability?
The 2.5mm x 2.0mm footprint increases placement density, which can elevate risk during automated assembly due to pick-and-place alignment challenges. Poor solder joint formation—such as tombstoning or bridging—is more likely with such miniaturized components, potentially compromising electrical connection or thermal dissipation. Reliability-wise, smaller packages generally exhibit lower mechanical stress during thermal cycling, but the ASD1-1.544MHZ-LR-T’s height (1.00mm max) still subjects it to CTE mismatch stresses between silicon die and substrate. Adherence to IPC Class 2 soldering profiles and inspection via AOI or X-ray is strongly advised to detect latent defects early in production.

Parts with Similar Specifications

The three parts on the right have similar specifications to Abracon LLC ASD1-1.544MHZ-LR-T

Product Attribute ASD1-1.544MHZ-EC-T3 ASD1-11.0592MHZ-LR-T ASD1-1.8432MHZ-LR-T ASD1-1.544MHZ-EC-T
Part Number ASD1-1.544MHZ-EC-T3 ASD1-11.0592MHZ-LR-T ASD1-1.8432MHZ-LR-T ASD1-1.544MHZ-EC-T
Manufacturer Abracon LLC Abracon LLC Abracon LLC Abracon LLC
Mounting Type - Surface Mount Through Hole Surface Mount
Function - - - -
Ratings - - - -
Absolute Pull Range (APR) - - - -
Base Resonator - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Series - - - -
Current - Supply (Disable) (Max) - - - -
Frequency - - - -
Size / Dimension - - - -
Height - Seated (Max) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Frequency Stability - - - -
Voltage - Supply - - - -
Current - Supply (Max) - - - -
Output - - - -
Type - - - -

ASD1-1.544MHZ-LR-T Datasheet PDF

Download ASD1-1.544MHZ-LR-T pdf datasheets and Abracon LLC documentation for ASD1-1.544MHZ-LR-T - Abracon LLC.

Datasheets
Cylindrical Battery Holders.pdf
3D Drawings
ASD.pdf.pdf
Environmental Information
Cylindrical Battery Holders.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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ASD1-1.544MHZ-LR-T Image

ASD1-1.544MHZ-LR-T

Abracon LLC
98D-ASD1-1.544MHZ-LR-T

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