8Z40020005 Crystal Equivalent & Substitute Parts

Part Overview

The 8Z40020005 is a 40 MHz fundamental mode crystal oscillator manufactured by TXC CORPORATION, designed for surface mount applications in a 4-SMD, No Lead package. This active product operates across the industrial temperature range of -30°C to 85°C with a frequency stability of ±10ppm and a load capacitance of 7.5pF. The component is RoHS Compliant and MSL 1 rated, making it suitable for high-reliability applications requiring stable frequency reference signals. Equivalent substitute parts are identified based on matching electrical specifications and mechanical compatibility within the same package category.

Substiute Parts

8Z40020005

TXC CORPORATIONIn Stock: 11058Z40020005 Datasheet

Current PartRFQ

FW400WFQA1

Diodes IncorporatedIn Stock: 3518FW400WFQA1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 8Z40020005 crystal is determined by the following critical electrical and mechanical parameters:

Frequency Match: The substitute part must operate at 40.0000 MHz to maintain circuit timing specifications.

Frequency Stability: The ±10ppm stability specification must be maintained to ensure acceptable frequency tolerance across the operating temperature range.

Load Capacitance Compatibility: The substitute part load capacitance must be within acceptable range of the original 7.5pF specification. The FW400WFQA1 operates at 7pF, which represents a 0.5pF variance and remains within typical circuit design tolerances for crystal oscillator applications.

ESR Specification: The equivalent series resistance of the substitute part must be compatible with the circuit's oscillator design. The 8Z40020005 specifies 60 Ohms ESR, while the FW400WFQA1 specifies 40 Ohms ESR. This difference is acceptable as lower ESR values do not degrade circuit performance.

Package Compatibility: Both parts utilize 4-SMD, No Lead surface mount packaging with identical maximum seated heights of 0.022" (0.55mm), ensuring mechanical interchangeability on PCB layouts.

Operating Temperature Range: Both parts operate across -30°C to 85°C, maintaining identical thermal performance specifications.

Regulatory Compliance: Both parts maintain RoHS compliance and MSL 1 ratings, ensuring equivalent environmental and moisture handling requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (8Z40020005): Use the original TXC CORPORATION part number 8Z40020005 when inventory is available and cost is not a constraint. This part is active, RoHS Compliant, and maintains full compliance with REACH regulations and EAR99 export classification.

Substitute Selection (FW400WFQA1): The Diodes Incorporated FW400WFQA1 serves as a direct electrical and mechanical substitute when the primary part is unavailable. This part maintains identical frequency, stability, and operating temperature specifications. The FW400WFQA1 offers the following advantages: lower ESR (40 Ohms versus 60 Ohms), smaller physical footprint (2.00mm x 1.60mm versus 2.50mm x 2.00mm), and higher inventory availability (3452 pieces in stock versus 1043 pieces). Both parts are active products with ROHS3 and RoHS compliance respectively, and both maintain MSL 1 ratings.

Compliance Verification: Both parts carry identical ECCN (EAR99) and HTSUS (8541.60.0060) classifications, confirming regulatory equivalence for procurement and export purposes.

Frequently Asked Questions (FAQ)

Q: Can the FW400WFQA1 be used as a direct replacement for the 8Z40020005 without circuit modification?

A: Yes. Both parts operate at 40.0000 MHz with ±10ppm stability across -30°C to 85°C. The load capacitance difference (7pF versus 7.5pF) and ESR difference (40 Ohms versus 60 Ohms) are within acceptable tolerances for standard crystal oscillator circuit designs. The identical 4-SMD, No Lead package and 0.55mm maximum height ensure mechanical interchangeability on PCB layouts.

Q: What is the significance of the load capacitance difference between these parts?

A: Load capacitance specifies the external capacitive load the crystal expects to see in the oscillator circuit. The 0.5pF difference between 7.5pF and 7pF is negligible in practical applications and does not require circuit redesign. Standard oscillator designs accommodate load capacitance variations within ±1pF.

Q: Does the lower ESR of the FW400WFQA1 affect circuit performance?

A: No. Lower ESR (40 Ohms versus 60 Ohms) improves oscillator startup characteristics and reduces power consumption. This represents a performance enhancement rather than a degradation.

Q: Are there any packaging or moisture sensitivity differences?

A: Both parts carry MSL 1 (Unlimited) ratings, indicating identical moisture sensitivity levels. No special handling or storage precautions differ between the two parts. Both are supplied in standard surface mount packaging formats.

Q: What is the physical footprint difference, and does it matter?

A: The FW400WFQA1 has a smaller footprint (2.00mm x 1.60mm) compared to the 8Z40020005 (2.50mm x 2.00mm). This smaller size may allow for more compact PCB layouts but does not affect electrical performance. Both parts maintain the same 0.55mm maximum seated height.

Q: Are both parts currently available for procurement?

A: Yes. The 8Z40020005 has 1043 pieces in stock, and the FW400WFQA1 has 3452 pieces in stock, both listed as new original inventory.