AT08070001 8 MHz Crystal Equivalent & Substitute Parts

Part Overview

The AT08070001 is an 8 MHz surface mount crystal manufactured by TXC CORPORATION, designed for applications requiring fundamental frequency oscillation at 8 MHz with 6pF load capacitance. This component is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure supply chain availability. The part meets AEC-Q200 automotive qualification standards and is RoHS compliant.

Substiute Parts

AT08070001

TXC CORPORATIONIn Stock: 965AT08070001 Datasheet

Current PartRFQ

AX-8.000MAMV-T

TXC CORPORATIONIn Stock: 845AX-8.000MAMV-T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT08070001 is constrained by the following critical parameters:

Frequency Match: The substitute must operate at exactly 8.0000 MHz to maintain circuit timing and functionality.

Load Capacitance Compatibility: The AT08070001 specifies 6pF load capacitance. Substitutes with different load capacitance values (such as 8pF) require circuit redesign of the oscillator tank circuit and are not direct pin-for-pin replacements without modification.

ESR and Frequency Stability: The 80 Ohm ESR and ±120ppm frequency stability define the oscillator's startup behavior and temperature performance. Substitutes with higher ESR or different stability specifications may affect circuit performance.

Package and Mounting: The HC-49/US package defines the physical footprint and mounting interface. Package changes require PCB redesign.

Regulatory Compliance: AEC-Q200 rating and RoHS compliance status must be maintained for automotive and regulated applications.

Based on these constraints, the AX-8.000MAMV-T is identified as a potential substitute candidate, though with noted parameter differences that require engineering evaluation.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitution Not Possible: The AX-8.000MAMV-T cannot serve as a direct pin-for-pin replacement for the AT08070001 due to three critical differences:

1. Load Capacitance Mismatch (6pF vs 8pF): The oscillator tank circuit must be redesigned to accommodate the 8pF load capacitance specification of the substitute. This requires modification of the load capacitors connected to the crystal pins.

2. Package Change (HC-49/US vs 2-SMD, No Lead): The physical footprint differs significantly. The substitute is smaller (8.00mm x 4.50mm vs 12.50mm x 4.80mm) and uses a different mounting interface, requiring PCB layout redesign.

3. ESR Increase (80 Ohms vs 120 Ohms): The higher ESR of the substitute may affect oscillator startup time and power consumption. Circuit simulation or testing is necessary to confirm acceptable performance.

Advantages of AX-8.000MAMV-T: The substitute offers improved frequency tolerance (±30ppm vs ±50ppm) and frequency stability (±100ppm vs ±120ppm), along with active product status and lower profile packaging. Both parts maintain AEC-Q200 qualification and RoHS compliance.

Application Suitability: Selection between these parts depends on whether the application can accommodate circuit and PCB modifications. If the original design is locked and cannot be modified, alternative 8 MHz crystals with matching 6pF load capacitance and HC-49/US packaging must be sourced.

Frequently Asked Questions (FAQ)

Q: Can the AX-8.000MAMV-T replace the AT08070001 without any circuit changes?

A: No. The different load capacitance (8pF vs 6pF) and package type (2-SMD, No Lead vs HC-49/US) require circuit redesign and PCB layout modification. Direct substitution is not possible.

Q: What is the impact of the 2pF load capacitance difference?

A: Load capacitance directly affects the oscillator tank circuit tuning. A 2pF increase requires adjustment of the load capacitors in the oscillator circuit to maintain the specified 8 MHz frequency. Incorrect load capacitance will result in frequency deviation outside acceptable tolerance.

Q: Why is the ESR higher on the substitute part?

A: ESR (Equivalent Series Resistance) is a characteristic of the crystal's internal structure and manufacturing process. The AX-8.000MAMV-T's 120 Ohm ESR is within normal manufacturing variation for 8 MHz crystals. Higher ESR may increase startup time and power consumption in the oscillator circuit.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the AT08070001 and AX-8.000MAMV-T carry AEC-Q200 qualification, indicating suitability for automotive temperature and reliability requirements.

Q: What is the significance of the product status difference (Obsolete vs Active)?

A: The AT08070001 is obsolete and no longer manufactured. The AX-8.000MAMV-T is in active production, ensuring long-term availability and supply chain continuity. For new designs or production continuation, the active part is preferred.

Q: Can the smaller package size of the AX-8.000MAMV-T be used in the same PCB footprint?

A: No. The AX-8.000MAMV-T uses a 2-SMD, No Lead package (8.00mm x 4.50mm) versus the HC-49/US package (12.50mm x 4.80mm) of the AT08070001. The footprints are incompatible and require PCB redesign.

Q: What certifications do both parts maintain?

A: Both parts are RoHS compliant and carry AEC-Q200 automotive qualification. Both are classified as EAR99 for export control purposes.