7X-38.400MBB-T Equivalent & Substitute Parts

Part Overview

The 7X-38.400MBB-T is a 38.4 MHz crystal oscillator (XO) manufactured by TXC CORPORATION, designed for applications requiring a standard XO with CMOS output and enable/disable functionality. This surface mount device operates at 3.3V supply voltage and is housed in a compact 4-SMD, No Lead package. The part maintains Active product status with full RoHS compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified to address inventory availability, performance optimization, or design flexibility while maintaining electrical and mechanical compatibility within the specified parameter constraints.

Substiute Parts

7X-38.400MBB-T

TXC CORPORATIONIn Stock: 12227X-38.400MBB-T Datasheet

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7X-38.400MBA-T

TXC CORPORATIONIn Stock: 34327X-38.400MBA-T Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 7X-38.400MBB-T is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 38.4 MHz
• Output Type: CMOS
• Supply Voltage: 3.3V
• Function: Enable/Disable
• Package Type: 4-SMD, No Lead
• Package Dimensions: 3.20mm × 2.50mm
• Maximum Height: 1.10mm
• Operating Temperature Range: -10°C to +70°C
• Maximum Supply Current: 20mA
• RoHS Status: Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Variable Parameters (Allowed to Differ):

• Frequency Stability: The main part specifies ±50ppm; substitute parts may offer improved stability (lower ppm tolerance) without affecting functional compatibility.

The 7X-38.400MBA-T meets all mandatory matching criteria and is therefore classified as a direct substitute. The improved frequency stability of ±25ppm in the substitute part represents a performance enhancement rather than a compatibility constraint.

Parameter Comparison

Engineering Selection Recommendations

7X-38.400MBB-T Selection Criteria:

• Primary choice when frequency stability of ±50ppm meets application requirements
• Suitable for general-purpose timing applications with standard tolerance specifications
• Active product status ensures continued manufacturing support and availability

7X-38.400MBA-T Selection Criteria:

• Select when improved frequency stability of ±25ppm is required for precision timing applications
• Tighter tolerance specification provides enhanced performance without modifying circuit design
• Active product status and higher inventory availability (3351 pcs vs. 1182 pcs) support supply chain continuity
• Identical electrical and mechanical characteristics ensure direct pin-for-pin and footprint compatibility

Both parts maintain full RoHS compliance and REACH unaffected status, meeting regulatory requirements for industrial and commercial applications. Selection between these parts depends solely on frequency stability requirements; no additional design modifications are necessary for substitution.

Frequently Asked Questions (FAQ)

Q: Can the 7X-38.400MBA-T replace the 7X-38.400MBB-T in existing designs?

A: Yes. The 7X-38.400MBA-T is a direct substitute with identical electrical and mechanical specifications. The improved frequency stability (±25ppm vs. ±50ppm) represents a performance enhancement and does not require circuit modifications. Pin configuration, package footprint, and all functional parameters remain unchanged.

Q: What is the difference between these two parts?

A: The primary difference is frequency stability tolerance. The 7X-38.400MBB-T specifies ±50ppm, while the 7X-38.400MBA-T specifies ±25ppm. All other parameters—frequency, voltage, output type, package dimensions, and operating range—are identical.

Q: Are both parts available in the same packaging format?

A: Yes. Both the 7X-38.400MBB-T and 7X-38.400MBA-T are supplied in Tape & Reel (TR) packaging as 4-SMD, No Lead devices with identical dimensions (3.20mm × 2.50mm × 1.10mm maximum height).

Q: Do these oscillators require any special handling or storage conditions?

A: Both parts carry Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements. Standard ESD precautions apply for surface mount components.

Q: Which part should be selected for new designs?

A: Selection depends on frequency stability requirements. For applications requiring tighter tolerance, the 7X-38.400MBA-T is the appropriate choice. For standard tolerance applications, either part is suitable. Both maintain Active product status and full regulatory compliance.

Q: Are there any supply chain considerations between these parts?

A: The 7X-38.400MBA-T maintains higher inventory availability (3351 pcs) compared to the 7X-38.400MBB-T (1182 pcs), which may influence procurement decisions for high-volume production.