7A-27.000MDDV-T Equivalent & Substitute Parts

Part Overview

The 7A-27.000MDDV-T is a 27 MHz fundamental mode crystal oscillator manufactured by TXC CORPORATION in a 2-SMD, no-lead surface mount package. This component operates at 27.0000 MHz with ±20ppm frequency stability and 8pF load capacitance. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Substiute Parts

7A-27.000MDDV-T

TXC CORPORATIONIn Stock: 12197A-27.000MDDV-T Datasheet

Current PartRFQ

445C22A27M00000

CTS-Frequency ControlsIn Stock: 851445C22A27M00000 Datasheet

SimilarRFQ

445C22J27M00000

CTS-Frequency ControlsIn Stock: 703445C22J27M00000 Datasheet

SimilarRFQ

445C22K27M00000

CTS-Frequency ControlsIn Stock: 1089445C22K27M00000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 7A-27.000MDDV-T is determined by the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 27 MHz (exact match required)
• Frequency Stability: ±20ppm (exact match required)
• Operating Mode: Fundamental (exact match required)
• Operating Temperature Range: -20°C ~ 70°C (exact match required)
• Package / Case: 2-SMD, No Lead (exact match required)
• Physical Dimensions: 5.00mm x 3.20mm x 1.35mm (exact match required)
• Mounting Type: Surface Mount (exact match required)

Allowable Variation Parameters:

• Load Capacitance: 8pF, 9pF, or 10pF (within acceptable circuit design tolerance)
• ESR: 40 Ohms or 50 Ohms (within acceptable circuit design tolerance)

All three substitute parts from CTS-Frequency Controls (445C22K27M00000, 445C22J27M00000, 445C22A27M00000) meet the mandatory matching criteria. Variations in load capacitance and ESR are permissible based on circuit design specifications and load network configuration.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 445C22K27M00000

The 445C22K27M00000 is the direct electrical equivalent to the 7A-27.000MDDV-T. This part maintains identical load capacitance (8pF) and operating specifications while offering lower ESR (40 Ohms versus 50 Ohms). The CTS-Frequency Controls part is currently in active production status with ROHS3 compliance certification and REACH unaffected status, ensuring long-term availability and regulatory compliance.

Secondary Substitutes: 445C22J27M00000 and 445C22A27M00000

The 445C22J27M00000 (9pF load capacitance) and 445C22A27M00000 (10pF load capacitance) are functionally equivalent alternatives. Selection between these variants depends on circuit load network design specifications. Both parts maintain active production status, ROHS3 compliance, and REACH unaffected status. The reduced ESR (40 Ohms) across all CTS alternatives provides improved frequency stability margin compared to the original TXC part.

All three CTS substitutes are suitable for direct replacement in applications where the original 7A-27.000MDDV-T is specified, provided circuit design accommodates the load capacitance and ESR variations.

Frequently Asked Questions (FAQ)

Q: Can the 445C22K27M00000 be used as a direct replacement for the 7A-27.000MDDV-T?

A: Yes. The 445C22K27M00000 maintains identical frequency (27 MHz), frequency stability (±20ppm), load capacitance (8pF), operating temperature range (-20°C ~ 70°C), and physical package dimensions (5.00mm x 3.20mm x 1.35mm). The lower ESR (40 Ohms versus 50 Ohms) is within acceptable design tolerance and provides improved performance characteristics.

Q: What is the difference between the three CTS substitute parts?

A: The three CTS alternatives differ only in load capacitance specification: 445C22K27M00000 (8pF), 445C22J27M00000 (9pF), and 445C22A27M00000 (10pF). All other electrical and mechanical parameters are identical. Selection depends on circuit load network design requirements.

Q: Are there any compatibility concerns with the physical package?

A: No. All substitute parts use the identical 2-SMD, no-lead surface mount package with dimensions of 5.00mm length x 3.20mm width x 1.35mm maximum height. PCB footprints and assembly processes require no modification.

Q: Does the lower ESR of the CTS parts affect circuit operation?

A: The lower ESR (40 Ohms) of CTS substitutes compared to the original TXC part (50 Ohms) is within acceptable design tolerance. Lower ESR generally improves frequency stability and reduces power dissipation. Circuit validation should confirm compatibility with specific load network impedance specifications.

Q: What is the difference between RoHS and ROHS3 compliance?

A: Both certifications indicate lead-free and restricted substance compliance. ROHS3 represents the current regulatory standard. All substitute parts meet ROHS3 compliance, ensuring alignment with current environmental and regulatory requirements.

Q: Are the CTS parts available in the same packaging format as the original?

A: The CTS substitute parts are supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes. The original TXC part packaging format is not specified in the provided data. Both formats are compatible with standard surface mount assembly equipment.

Q: What is the significance of Moisture Sensitivity Level 1?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life without special moisture control measures. No desiccant storage or baking procedures are required prior to assembly, simplifying inventory management and reducing handling complexity.