Equivalent & Substitute Parts for 7A-18.432MBBK-T MHz Crystal

Part Overview

The 7A-18.432MBBK-T is an 18.432 MHz fundamental mode quartz crystal manufactured by TXC CORPORATION, designed for surface mount applications in 2-SMD, No Lead package configuration. This component operates at ±50ppm frequency stability with 20pF load capacitance and 50 Ohms equivalent series resistance across an operating temperature range of -20°C to 70°C.

The main part is classified as Obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this crystal frequency and electrical specification.

Substiute Parts

7A-18.432MBBK-T

TXC CORPORATIONIn Stock: 11417A-18.432MBBK-T Datasheet

Current PartRFQ

7A-18.432MBBK-T

FTSIn Stock: 370787A-18.432MBBK-T Datasheet

Parametric EquivalentRFQ

QT532G-18.432MBBK-T

QSTIn Stock: 36758QT532G-18.432MBBK-T Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 7A-18.432MBBK-T are identified based on strict electrical and mechanical parameter matching. The substitution logic is based on the following critical parameters that must remain constant across all equivalent parts:

Electrical Parameters (Must Match Exactly):

• Frequency: 18.432 MHz
• Frequency Stability: ±50ppm
• Load Capacitance: 20pF
• ESR: 50 Ohms
• Operating Mode: Fundamental

Mechanical Parameters (Must Match Exactly):

• Mounting Type: Surface Mount
• Package / Case: 2-SMD, No Lead
• Size / Dimension: 5.00mm x 3.20mm (0.197" L x 0.126" W)
• Height - Seated (Max): 1.35mm (0.053")

Environmental Parameters (Must Match or Exceed):

• Operating Temperature Range: -20°C to 70°C
• Moisture Sensitivity Level: 1 (Unlimited)
• RoHS Compliance: Required

All identified substitute parts meet these criteria without exception. No parameter deviation is permitted for functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute Recommendation: 7A-18.432MBBK-T (FTS)

The FTS-manufactured 7A-18.432MBBK-T is the direct parametric equivalent to the obsolete TXC CORPORATION part. This substitute maintains identical electrical specifications, mechanical dimensions, and environmental operating parameters. The FTS variant carries Active product status with significantly higher inventory availability (37,061 units in stock). RoHS compliance is confirmed. This part is suitable for direct replacement in all applications previously utilizing the TXC original.

Secondary Substitute Recommendation: QT532G-18.432MBBK-T (QST)

The QST QT532G-18.432MBBK-T provides full parametric equivalence with all critical electrical and mechanical specifications matching the original part. This substitute is classified as Active product status with high inventory availability (36,735 units in stock). ROHS3 compliance certification is provided, exceeding baseline RoHS requirements. This part is suitable for direct replacement in all applications previously utilizing the TXC original.

Selection Basis:

Both substitute parts satisfy all mandatory electrical parameters (frequency, stability, load capacitance, ESR, operating mode), mechanical parameters (package type, dimensions, height), and environmental requirements (operating temperature range, MSL rating, RoHS compliance). Selection between the two substitutes may be based on supplier preference, packaging format availability, or specific compliance documentation requirements.

Frequently Asked Questions (FAQ)

Q: Can the 7A-18.432MBBK-T (FTS) be used as a direct replacement for the obsolete TXC part?

A: Yes. The FTS variant maintains identical electrical specifications (18.432 MHz, ±50ppm stability, 20pF load capacitance, 50 Ohms ESR), mechanical configuration (2-SMD No Lead package, 5.00mm x 3.20mm dimensions, 1.35mm max height), and environmental operating range (-20°C to 70°C). No circuit modifications are required.

Q: What is the difference between the FTS and QST substitute parts?

A: Both parts are parametrically equivalent with identical electrical and mechanical specifications. The primary differences are manufacturer identity (FTS versus QST), RoHS certification level (RoHS Compliant versus ROHS3 Compliant), and potentially different packaging supplier relationships. Electrical performance and physical compatibility are identical.

Q: Are there any load capacitance or ESR differences between the substitutes?

A: No. All three parts (original TXC, FTS substitute, and QST substitute) specify identical load capacitance of 20pF and ESR of 50 Ohms. These parameters are critical for circuit oscillator design and must remain constant across all equivalent parts.

Q: Can these crystals be used in applications requiring different operating temperature ranges?

A: No. All three parts are specified for -20°C to 70°C operating temperature range. Applications requiring extended temperature operation require different crystal components with appropriate temperature specifications.

Q: What is the significance of MSL Level 1 (Unlimited) rating?

A: MSL Level 1 indicates unlimited shelf life without moisture bake-out requirements. These crystals do not require special moisture control during storage or handling, simplifying inventory management and reducing preparation time before assembly.

Q: Are the substitute parts available in different packaging formats?

A: The FTS and QST substitutes are specified in Tape & Reel (TR) packaging format. The original TXC part packaging format is not specified in the provided data. Confirm packaging requirements with your procurement or assembly department before finalizing part selection.

Q: Do all three parts meet RoHS compliance requirements?

A: Yes. The TXC original and FTS substitute are RoHS Compliant. The QST substitute carries ROHS3 Compliant certification, which represents an enhanced compliance standard. All three parts satisfy RoHS regulatory requirements.