9B-64.000MBBK-B Crystal Oscillator Equivalent & Substitute Parts

Part Overview

The 9B-64.000MBBK-B is a 64 MHz through-hole crystal manufactured by TXC CORPORATION in HC-49/US package format. This component is classified as obsolete product status. The part operates at 64 MHz with ±50ppm frequency stability and 20pF load capacitance, designed for 3rd overtone operation across the -20°C to 70°C temperature range. Due to obsolete product status, identification of equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value	Unit
Frequency	64.0000	MHz
Frequency Stability	±50	ppm
Load Capacitance	20	pF
ESR (Equivalent Series Resistance)	60	Ohms
Operating Mode	3rd Overtone	—
Operating Temperature Range	-20 to +70	°C
Mounting Type	Through Hole	—
Package / Case	HC-49/US	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 9B-64.000MBBK-B is determined by the following critical parameters:

Mandatory Matching Parameters:

Frequency: 64.0000 MHz (exact match required)
Load Capacitance: 20pF (exact match required)
Operating Mode: 3rd Overtone (exact match required)
Package / Case: HC-49/US (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -20°C to +70°C (minimum coverage required)

Allowable Variation Parameters:

Frequency Stability: ±50ppm or tighter tolerance acceptable
Frequency Tolerance: May be tighter than ±50ppm
ESR: Variation acceptable within circuit design margins
Physical dimensions: Minor variations acceptable within HC-49/US standard envelope

The ATS640A from CTS-Frequency Controls meets all mandatory matching criteria and qualifies as a direct substitute for the obsolete 9B-64.000MBBK-B.

Parameter Comparison

Parameter	9B-64.000MBBK-B (TXC)	ATS640A (CTS-Frequency Controls)	Compatibility
Frequency	64.0000 MHz	64.0000 MHz	Match
Frequency Stability	±50 ppm	±50 ppm	Match
Frequency Tolerance	±50 ppm	±30 ppm	Substitute tighter
Load Capacitance	20 pF	20 pF	Match
ESR	60 Ohms	80 Ohms	Variation acceptable
Operating Mode	3rd Overtone	3rd Overtone	Match
Operating Temperature	-20 to +70°C	-20 to +70°C	Match
Mounting Type	Through Hole	Through Hole	Match
Package / Case	HC-49/US	HC-49/US	Match
Size / Dimension	11.50 x 5.00 mm	10.85 x 4.50 mm	Within HC-49/US envelope
Height - Seated (Max)	3.68 mm	3.68 mm	Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
Product Status	Obsolete	Active	Substitute active

Engineering Selection Recommendations

The ATS640A is the qualified substitute for the obsolete 9B-64.000MBBK-B based on the following engineering criteria:

Electrical Compatibility: All critical electrical parameters match or exceed the original specification. The ATS640A provides tighter frequency tolerance (±30ppm versus ±50ppm), which represents an improvement over the original part. The ESR variation from 60 Ohms to 80 Ohms falls within acceptable operating margins for standard crystal oscillator circuits.

Mechanical Compatibility: Both parts conform to the HC-49/US package standard with identical maximum seated height (3.68mm). The ATS640A dimensions (10.85 x 4.50mm) remain within the HC-49/US envelope specification, ensuring PCB footprint compatibility without design modification.

Compliance Status: The ATS640A maintains ROHS3 compliance equivalent to the original part. The substitute part is REACH Unaffected, compared to the original REACH Affected status, representing improved regulatory compliance for new production.

Product Availability: The ATS640A holds active product status with 989 pieces in stock, compared to the obsolete 9B-64.000MBBK-B. This ensures long-term component availability for ongoing production requirements.

Frequently Asked Questions (FAQ)

Q: Can the ATS640A directly replace the 9B-64.000MBBK-B without PCB modification?

A: Yes. Both parts use identical HC-49/US package format with matching maximum seated height (3.68mm). The ATS640A dimensions remain within the HC-49/US standard envelope. No PCB layout changes are required for mechanical or electrical integration.

Q: What is the significance of the ESR difference between 60 Ohms and 80 Ohms?

A: ESR variation of this magnitude is within normal operating tolerance for crystal oscillator circuits. The 20 Ohm difference does not affect frequency stability, load capacitance matching, or circuit performance in standard applications. Circuit validation should confirm ESR compatibility with specific oscillator IC specifications if required.

Q: Why does the ATS640A have tighter frequency tolerance (±30ppm) than the original part (±50ppm)?

A: Tighter tolerance represents improved manufacturing precision from CTS-Frequency Controls. This provides better frequency accuracy and is fully compatible with applications designed for ±50ppm tolerance. No circuit redesign is necessary.

Q: Are there packaging differences between the original and substitute part?

A: The original 9B-64.000MBBK-B is supplied in Bulk packaging, while the ATS640A is supplied in Tape & Reel (TR) format. Both are through-hole components with identical electrical and mechanical specifications. Tape & Reel packaging is standard for active production components and does not affect component performance.

Q: What compliance certifications apply to the ATS640A?

A: The ATS640A is ROHS3 compliant and REACH Unaffected. These certifications meet or exceed the regulatory requirements of the obsolete original part, ensuring compliance for new production and export applications.

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