9B-10.000MEEJ-B Equivalent & Substitute Parts

Part Overview

The 9B-10.000MEEJ-B is a 10 MHz through-hole crystal oscillator manufactured by TXC CORPORATION, designed for fundamental mode operation with 18pF load capacitance and 40 Ohms equivalent series resistance (ESR). This component operates across the -20°C to 70°C temperature range and is housed in the HC-49/US package format.

The 9B-10.000MEEJ-B is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance and repairs.

Key Parameters

Parameter	Value
Frequency	10 MHz
Frequency Stability	±10ppm
Load Capacitance	18pF
ESR (Equivalent Series Resistance)	40 Ohms
Operating Mode	Fundamental
Operating Temperature Range	-20°C to 70°C
Mounting Type	Through Hole
Package / Case	HC-49/US
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for 10 MHz through-hole crystals is determined by the following critical parameters:

Primary Compatibility Criteria:

Frequency: 10 MHz (exact match required)
Load Capacitance: 18pF (exact match required)
Operating Mode: Fundamental (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 requirement)

Secondary Compatibility Criteria:

Frequency Stability: ±10ppm or tighter tolerance acceptable
ESR: 40 Ohms or lower acceptable (lower ESR does not degrade performance)
RoHS Compliance: ROHS3 Compliant required

The substitute parts listed below meet all primary compatibility criteria. Variations in frequency stability and ESR are noted and must be evaluated against specific circuit requirements.

Parameter Comparison

Parameter	9B-10.000MEEJ-B (Main)	9B-10.000MAAJ-B	ECS-100-18-4X-CKM
Manufacturer	TXC CORPORATION	TXC CORPORATION	ECS Inc.
Frequency	10 MHz	10 MHz	10 MHz
Frequency Stability	±10ppm	±30ppm	±10ppm
Load Capacitance	18pF	18pF	18pF
ESR (Equivalent Series Resistance)	40 Ohms	40 Ohms	60 Ohms
Operating Mode	Fundamental	Fundamental	Fundamental
Operating Temperature Range	-20°C to 70°C	-20°C to 70°C	-20°C to 70°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	HC-49/US	HC-49/US	HC-49/US
Product Status	Obsolete	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

9B-10.000MAAJ-B (TXC CORPORATION): This substitute maintains identical mechanical and electrical specifications to the main part with one exception: frequency stability is ±30ppm versus ±10ppm. Both parts are obsolete TXC CORPORATION products in the 9B series. Selection of this substitute is appropriate only when circuit design tolerates the wider frequency stability specification. ESR and load capacitance are identical to the main part.

ECS-100-18-4X-CKM (ECS Inc.): This substitute matches the main part in frequency, load capacitance, frequency stability (±10ppm), operating mode, temperature range, mounting type, and package format. The ESR specification is 60 Ohms compared to 40 Ohms in the main part. This substitute is classified as Active product status, providing superior long-term supply chain availability compared to the obsolete main part. The higher ESR value must be evaluated against circuit impedance matching requirements and oscillator design specifications.

Both substitutes are ROHS3 compliant and suitable for applications requiring 10 MHz through-hole crystals with 18pF load capacitance in HC-49/US packaging.

Frequently Asked Questions (FAQ)

Q: Can the 9B-10.000MAAJ-B replace the 9B-10.000MEEJ-B in all applications?

A: The 9B-10.000MAAJ-B is mechanically and electrically compatible with identical package, mounting type, load capacitance, and ESR. However, frequency stability differs: ±30ppm versus ±10ppm. Substitution is valid only if circuit design specifications permit the wider tolerance. Applications requiring ±10ppm stability must use the main part or the ECS-100-18-4X-CKM substitute.

Q: What is the significance of the ESR difference between the main part and ECS-100-18-4X-CKM?

A: ESR (Equivalent Series Resistance) affects oscillator startup characteristics and power consumption. The ECS-100-18-4X-CKM has 60 Ohms ESR compared to 40 Ohms in the main part. Lower ESR is generally preferable for oscillator performance. The 60 Ohms specification must be verified against oscillator circuit design parameters, particularly for circuits with tight impedance matching requirements or low-power operation.

Q: Why is ECS-100-18-4X-CKM listed as Active while the main part is Obsolete?

A: Product status reflects manufacturer support and availability. The ECS-100-18-4X-CKM is actively manufactured by ECS Inc., ensuring continued supply chain availability. The 9B-10.000MEEJ-B and 9B-10.000MAAJ-B are obsolete TXC CORPORATION products. For new designs or long-term production requirements, the active ECS-100-18-4X-CKM substitute provides superior supply continuity.

Q: Are all three parts physically interchangeable in HC-49/US sockets?

A: All three parts use HC-49/US packaging and through-hole mounting. Physical dimensions vary slightly: the main part and 9B-10.000MAAJ-B measure 0.453" L x 0.197" W (11.50mm x 5.00mm), while the ECS-100-18-4X-CKM measures 0.447" L x 0.183" W (11.35mm x 4.65mm). These dimensional variations are within HC-49/US standard tolerances and do not prevent mechanical interchangeability in standard crystal sockets.

Q: What compliance certifications apply to these parts?

A: All three parts are ROHS3 compliant. The main part and 9B-10.000MAAJ-B are REACH Affected; the ECS-100-18-4X-CKM is REACH Unaffected. All parts carry EAR99 ECCN classification and HTSUS code 8541.60.0050.

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