9B-48.000MAAJ-B Equivalent & Substitute Parts

Part Overview

The 9B-48.000MAAJ-B is a 48 MHz through-hole crystal oscillator manufactured by TXC CORPORATION. This component operates at 48 MHz with ±30ppm frequency stability and 18pF load capacitance in an HC-49/US package. The part is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility while meeting current availability and compliance requirements.

Key Parameters

Parameter	Value
Frequency	48 MHz
Frequency Stability	±30ppm
Load Capacitance	18pF
ESR (Equivalent Series Resistance)	80 Ohms
Package / Case	HC-49/US
Mounting Type	Through Hole
Operating Temperature Range	-20°C ~ 70°C
Operating Mode	3rd Overtone
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 9B-48.000MAAJ-B is determined by the following critical parameters:

Mandatory Matching Parameters:

Frequency: 48 MHz (exact match required)
Load Capacitance: 18pF (exact match required)
Package / Case: HC-49/US (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -20°C ~ 70°C (minimum coverage required)

Allowable Variation Parameters:

Frequency Stability: Substitute parts with equal or tighter (lower) ppm tolerance are acceptable
ESR: Substitute parts with equal or lower ESR values are acceptable
Operating Mode: May differ (Fundamental vs. 3rd Overtone) provided frequency and load capacitance specifications are met
Product Status: Active parts are preferred over obsolete parts for new applications

Both identified substitute parts meet all mandatory matching criteria and provide improved or equivalent electrical characteristics.

Parameter Comparison

Parameter	9B-48.000MAAJ-B (Main)	ABL-48.000MHZ-B2	ABL-48.000MHZ-B1U-T
Manufacturer	TXC CORPORATION	Abracon LLC	Abracon LLC
Frequency	48 MHz	48 MHz	48 MHz
Frequency Stability	±30ppm	±20ppm	±10ppm
Load Capacitance	18pF	18pF	18pF
ESR	80 Ohms	80 Ohms	40 Ohms
Operating Mode	3rd Overtone	Fundamental	Fundamental
Package / Case	HC-49/US	HC-49/US	HC-49/US
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature	-20°C ~ 70°C	-20°C ~ 70°C	-20°C ~ 70°C
Height - Seated (Max)	0.145" (3.68mm)	0.138" (3.50mm)	0.138" (3.50mm)
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Bulk	Bulk	Tape & Reel (TR)

Engineering Selection Recommendations

ABL-48.000MHZ-B2 (Abracon LLC)

This substitute provides direct electrical equivalence with the main part. Both components feature 80 Ohms ESR and operate across the identical temperature range. The ABL-48.000MHZ-B2 offers improved frequency stability at ±20ppm compared to the ±30ppm specification of the 9B-48.000MAAJ-B. Active product status ensures long-term availability. Bulk packaging matches the original part configuration. This substitute is suitable for applications where ESR matching and frequency stability improvement are beneficial.

ABL-48.000MHZ-B1U-T (Abracon LLC)

This substitute provides superior electrical performance with ±10ppm frequency stability and 40 Ohms ESR, representing a 50% reduction in ESR compared to the main part. Active product status and ROHS3 compliance are maintained. The primary distinction is Tape & Reel packaging, which is standard for production environments. Slightly reduced seated height (3.50mm vs. 3.68mm) remains within typical PCB design tolerances for HC-49/US packages. This substitute is recommended for applications requiring enhanced frequency stability and lower ESR characteristics.

Both substitutes are ROHS3 compliant and maintain full compatibility with the original 48 MHz, 18pF, HC-49/US specification envelope.

Frequently Asked Questions (FAQ)

Q: Can ABL-48.000MHZ-B2 and ABL-48.000MHZ-B1U-T be used interchangeably with 9B-48.000MAAJ-B?

A: Both Abracon substitutes are electrically compatible with the 9B-48.000MAAJ-B. All three parts share identical frequency (48 MHz), load capacitance (18pF), package type (HC-49/US), and operating temperature range (-20°C ~ 70°C). The substitutes offer equal or improved frequency stability and ESR characteristics.

Q: What is the difference between the two Abracon substitutes?

A: ABL-48.000MHZ-B2 matches the original ESR specification at 80 Ohms with ±20ppm stability and is supplied in Bulk packaging. ABL-48.000MHZ-B1U-T provides superior performance with 40 Ohms ESR and ±10ppm stability, supplied in Tape & Reel packaging. Selection depends on packaging requirements and whether enhanced frequency stability is needed.

Q: Does the difference in operating mode (3rd Overtone vs. Fundamental) affect substitution?

A: No. The operating mode difference does not prevent substitution provided all other electrical parameters match. Both fundamental and 3rd overtone modes achieve the specified 48 MHz frequency with 18pF load capacitance in the HC-49/US package.

Q: Are there packaging considerations when substituting?

A: The main part is supplied in Bulk packaging. ABL-48.000MHZ-B2 maintains Bulk packaging for direct replacement. ABL-48.000MHZ-B1U-T is supplied in Tape & Reel format, which is standard for production assembly but requires different handling and storage procedures.

Q: What is the significance of the height difference (3.68mm vs. 3.50mm)?

A: The 0.18mm height reduction in the Abracon substitutes is within standard HC-49/US package tolerances and does not affect PCB layout compatibility or soldering procedures for through-hole applications.

Q: Are all three parts RoHS3 compliant?

A: Yes. The main part 9B-48.000MAAJ-B and both Abracon substitutes (ABL-48.000MHZ-B2 and ABL-48.000MHZ-B1U-T) are ROHS3 compliant.

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