Equivalent & Substitute Parts for 9B-4.000MEEK-B

Part Overview

The 9B-4.000MEEK-B is a 4 MHz through-hole crystal oscillator manufactured by TXC CORPORATION, specified for fundamental mode operation with 20pF load capacitance and 150 Ohms equivalent series resistance (ESR). This component operates across the temperature range of -20°C to 70°C with ±30ppm frequency stability and tolerance. The part is classified as obsolete, making identification of functionally equivalent substitutes necessary for ongoing system support and procurement.

Substiute Parts

9B-4.000MEEK-B

TXC CORPORATIONIn Stock: 7729B-4.000MEEK-B Datasheet

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9B-4.000MAAJ-B

TXC CORPORATIONIn Stock: 11679B-4.000MAAJ-B Datasheet

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GB0400005

Diodes IncorporatedIn Stock: 1563GB0400005 Datasheet

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GB0400039

Diodes IncorporatedIn Stock: 844GB0400039 Datasheet

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HC49US-FF3F18-4.000MHZ

ILSIIn Stock: 699HC49US-FF3F18-4.000MHZ Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 9B-4.000MEEK-B is determined by the following critical parameters:

Primary Matching Criteria:

• Frequency: 4.0000 MHz (exact match required)
• Frequency Stability: ±30ppm (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 (exact match required)

Secondary Compatibility Parameters:

• Load Capacitance: 20pF (primary specification; 18pF and 16pF variants acceptable with circuit load capacitance adjustment)
• ESR: 150 Ohms (primary specification; lower ESR values acceptable)

All substitute parts listed maintain identical frequency, stability, operating mode, package, mounting type, and temperature range specifications. Variations in load capacitance and ESR are noted and must be evaluated against specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Identical Specifications):

GB0400039 (Diodes Incorporated) is the direct equivalent to 9B-4.000MEEK-B. Both parts specify 4.0000 MHz frequency, ±30ppm stability, 20pF load capacitance, 150 Ohms ESR, HC-49/US package, and -20°C to 70°C operating temperature. GB0400039 holds active product status and REACH Unaffected compliance, providing superior long-term availability compared to the obsolete TXC part.

Compatible Alternatives (Load Capacitance Variation):

9B-4.000MAAJ-B (TXC CORPORATION) and HC49US-FF3F18-4.000MHZ (ILSI) both specify 18pF load capacitance instead of 20pF. These parts are compatible when circuit load capacitance can be adjusted to accommodate the 2pF difference. Both maintain identical frequency, stability, ESR, package, and temperature specifications.

GB0400005 (Diodes Incorporated) specifies 16pF load capacitance and 120 Ohms ESR. This part is compatible when circuit load capacitance adjustment accommodates the 4pF difference and when the lower ESR value is acceptable for the application.

Compliance Considerations:

Parts GB0400039, GB0400005, and HC49US-FF3F18-4.000MHZ all maintain ROHS3 compliance and active product status. GB0400039 and GB0400005 are REACH Unaffected, eliminating regulatory documentation requirements associated with REACH Affected parts (9B-4.000MEEK-B and 9B-4.000MAAJ-B).

Frequently Asked Questions (FAQ)

Q: Can GB0400039 be used as a direct replacement for 9B-4.000MEEK-B without circuit modification?

A: Yes. GB0400039 matches all critical specifications: 4.0000 MHz frequency, ±30ppm stability, 20pF load capacitance, 150 Ohms ESR, HC-49/US package, and -20°C to 70°C operating temperature. No circuit modification is required.

Q: What is the difference between the 20pF, 18pF, and 16pF load capacitance variants?

A: Load capacitance specifies the external capacitance value the crystal oscillator circuit must present for the crystal to oscillate at the specified frequency. Substituting a crystal with different load capacitance requires adjusting the circuit's load capacitance network. The 20pF variant (9B-4.000MEEK-B and GB0400039) is the direct match. The 18pF variant (9B-4.000MAAJ-B and HC49US-FF3F18-4.000MHZ) and 16pF variant (GB0400005) require circuit load capacitance adjustment.

Q: Does the 120 Ohms ESR of GB0400005 affect compatibility?

A: GB0400005 specifies 120 Ohms ESR compared to 150 Ohms for the main part. Lower ESR values are generally acceptable and may improve circuit performance. However, the 4pF load capacitance difference requires circuit adjustment. Verify that the application circuit can accommodate both the lower ESR and adjusted load capacitance.

Q: Why are GB0400039 and GB0400005 preferred over the TXC alternatives?

A: GB0400039 and GB0400005 hold active product status, ensuring long-term availability and supply chain stability. Both are REACH Unaffected, eliminating regulatory compliance documentation. The TXC parts (9B-4.000MEEK-B and 9B-4.000MAAJ-B) are classified as obsolete and REACH Affected, presenting procurement and regulatory risks.

Q: Are all substitute parts HC-49/US package compatible with the original PCB footprint?

A: All listed parts use HC-49/US package. Physical dimensions vary slightly between manufacturers (TXC: 11.50mm × 5.00mm; Diodes: 11.20mm × 5.00mm; ILSI: 11.10mm × 4.70mm). These variations fall within standard HC-49/US tolerance ranges and are compatible with standard HC-49/US PCB footprints. Verify footprint dimensions against specific PCB design if tight mechanical constraints exist.

Q: Can HC49US-FF3F18-4.000MHZ be used in applications requiring 20pF load capacitance?

A: HC49US-FF3F18-4.000MHZ specifies 18pF load capacitance. Direct substitution in a circuit designed for 20pF load capacitance will result in frequency deviation. The circuit load capacitance network must be adjusted to present 18pF to the crystal. Frequency accuracy depends on proper load capacitance matching.