AS-14.31818MAHI-B Crystal Equivalent & Substitute Parts

Part Overview

The AS-14.31818MAHI-B is a 14.31818 MHz through-hole crystal oscillator manufactured by TXC CORPORATION, designed for fundamental mode operation in applications requiring precise frequency control. This component features a 16pF load capacitance, 60 Ohms equivalent series resistance (ESR), and operates across the -40°C to 85°C temperature range with ±30ppm frequency stability.

The AS-14.31818MAHI-B is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support legacy system maintenance and production requirements.

Substiute Parts

AS-14.31818MAHI-B

TXC CORPORATIONIn Stock: 924AS-14.31818MAHI-B Datasheet

Current PartRFQ

9B-14.31818MAAJ-B

TXC CORPORATIONIn Stock: 15629B-14.31818MAAJ-B Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AS-14.31818MAHI-B is determined by the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 14.31818 MHz (exact match required)
• Frequency Stability: ±30ppm (tolerance specification)
• Operating Mode: Fundamental
• Package / Case: HC-49/US (physical and electrical interface)
• Mounting Type: Through Hole

Allowable Variation Parameters:

• Load Capacitance: The substitute part may differ from the primary specification (16pF) provided the circuit design accommodates the alternative load capacitance value
• ESR: The substitute part may have different ESR characteristics (30 Ohms vs. 60 Ohms) within the HC-49/US package constraints
• Operating Temperature Range: The substitute part may have a narrower operating temperature range (-20°C to 70°C vs. -40°C to 85°C) if the application does not require the full extended range
• Compliance Certifications: RoHS and REACH compliance status may differ between parts

The 9B-14.31818MAAJ-B qualifies as a substitute based on matching frequency, frequency stability, operating mode, package type, and mounting configuration, despite differences in load capacitance, ESR, and operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration: Product Status

Both the AS-14.31818MAHI-B and 9B-14.31818MAAJ-B are classified as obsolete. Selection between these parts should be based on current inventory availability and application-specific requirements rather than product status alone.

Compliance and Certification

The AS-14.31818MAHI-B carries RoHS Compliant certification. The 9B-14.31818MAAJ-B carries ROHS3 Compliant certification and is REACH Affected. Both parts meet environmental compliance requirements for their respective regulatory frameworks. If REACH compliance is a system requirement, the 9B-14.31818MAAJ-B is the appropriate selection.

Application-Specific Parameters

Selection between these parts depends on three critical factors:

1. Operating Temperature Requirements: If the application requires operation below -20°C or above 70°C, the AS-14.31818MAHI-B is required. If the application operates within -20°C to 70°C, the 9B-14.31818MAAJ-B is acceptable.

2. Load Capacitance Compatibility: The 2pF difference in load capacitance (16pF vs. 18pF) affects oscillator circuit tuning. The circuit design must accommodate the 18pF load capacitance of the substitute part. Verify that the oscillator circuit can operate stably with 18pF load capacitance.

3. ESR Tolerance: The 9B-14.31818MAAJ-B has lower ESR (30 Ohms vs. 60 Ohms). Verify that the oscillator circuit design is compatible with lower ESR characteristics. Lower ESR may affect startup behavior and power consumption.

Frequently Asked Questions (FAQ)

Q: Can the 9B-14.31818MAAJ-B be used as a direct replacement for the AS-14.31818MAHI-B?

A: The 9B-14.31818MAAJ-B is a functional substitute for the AS-14.31818MAHI-B provided that: (1) the application operates within the -20°C to 70°C temperature range, (2) the oscillator circuit is designed to accommodate 18pF load capacitance, and (3) the circuit is compatible with 30 Ohms ESR. If any of these conditions are not met, direct substitution is not appropriate.

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

A: Load capacitance determines the frequency tuning characteristics of the crystal in the oscillator circuit. The AS-14.31818MAHI-B specifies 16pF load capacitance, while the 9B-14.31818MAAJ-B specifies 18pF. The oscillator circuit must be designed for the specific load capacitance value. Using a crystal with different load capacitance may result in frequency drift or instability if the circuit is not adjusted accordingly.

Q: Are both parts physically interchangeable in the HC-49/US package?

A: Yes. Both parts use the HC-49/US package with identical physical dimensions (0.453" L x 0.197" W, 11.50mm x 5.00mm). Both are through-hole mounted components with the same footprint and pin configuration. Physical installation is interchangeable.

Q: What does the ±30ppm frequency stability specification mean?

A: Frequency stability of ±30ppm indicates that the actual frequency output will not deviate more than 30 parts per million from the nominal 14.31818 MHz frequency across the specified operating temperature range. Both the AS-14.31818MAHI-B and 9B-14.31818MAAJ-B meet this specification.

Q: Why does the substitute part have lower ESR?

A: ESR (Equivalent Series Resistance) is an internal resistance characteristic of the crystal. Lower ESR (30 Ohms vs. 60 Ohms) in the 9B-14.31818MAAJ-B may result in lower power consumption and faster oscillator startup. However, the oscillator circuit must be designed to accommodate this characteristic. Verify circuit compatibility before substitution.

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

A: RoHS Compliant indicates compliance with the original Restriction of Hazardous Substances Directive. ROHS3 Compliant indicates compliance with the updated RoHS 3 Directive (2015/863/EU), which includes additional restricted substances. ROHS3 is the current standard. The 9B-14.31818MAAJ-B meets the current regulatory requirement.

Q: Can I use the 9B-14.31818MAAJ-B if my application requires operation at -40°C?

A: No. The 9B-14.31818MAAJ-B has an operating temperature range of -20°C to 70°C and is not specified for operation at -40°C. The AS-14.31818MAHI-B, with an operating range of -40°C to 85°C, is required for applications requiring -40°C operation.