TC-1.544MBD-T Equivalent & Substitute Parts

Part Overview

The TC-1.544MBD-T is a 1.544 MHz MEMS-based XO (Standard) oscillator manufactured by TXC CORPORATION. This component operates at 3.3V with CMOS output, Enable/Disable function, and is housed in a 4-SMD, No Lead package. The part is classified as Obsolete, necessitating identification of equivalent substitute components that maintain electrical and mechanical compatibility for ongoing system support and new production requirements.

Substiute Parts

TC-1.544MBD-T

TXC CORPORATIONIn Stock: 969TC-1.544MBD-T Datasheet

Current PartRFQ

7X-1.544MBD-T

TXC CORPORATIONIn Stock: 7177X-1.544MBD-T Datasheet

DirectRFQ

ASE-1.544MHZ-LR-T

Abracon LLCIn Stock: 1115ASE-1.544MHZ-LR-T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TC-1.544MBD-T are qualified based on the following critical parameters:

Electrical Compatibility:

• Frequency: 1.544 MHz (exact match required)
• Output: CMOS
• Supply Voltage: 3.3V
• Function: Enable/Disable capability
• Frequency Stability: ±25ppm
• Operating Temperature: -40°C ~ 85°C

Mechanical Compatibility:

• Package / Case: 4-SMD, No Lead
• Dimensions: 0.126" L x 0.098" W (3.20mm x 2.50mm)
• Mounting Type: Surface Mount
• MSL Rating: 1 (Unlimited)

All identified substitutes meet these core requirements. Variations in supply current, resonator technology (MEMS vs. Crystal), and product status are secondary considerations that do not affect functional interchangeability within the specified electrical and mechanical constraints.

Parameter Comparison

Engineering Selection Recommendations

7X-1.544MBD-T (TXC CORPORATION): This substitute maintains the same manufacturer lineage as the obsolete TC-1.544MBD-T. It is Active in product status and RoHS Compliant. The primary difference is the shift from MEMS to Crystal-based resonator technology. Supply current is reduced to 15mA maximum. Height increases to 1.10mm, which remains within typical PCB assembly tolerances for 4-SMD packages. This part is suitable for direct replacement in applications where the increased height does not conflict with board-level constraints.

ASE-1.544MHZ-LR-T (Abracon LLC): This substitute offers the lowest supply current at 7mA maximum and includes specified disable-mode current of 10µA, providing enhanced power efficiency for battery-operated or low-power applications. ROHS3 Compliant status indicates compliance with the latest RoHS directives. Height is 1.20mm. The Crystal-based resonator and cross-manufacturer sourcing provide supply chain diversification. This part is suitable for applications prioritizing power consumption and regulatory compliance.

Both substitutes are Active products with unlimited MSL ratings, ensuring long-term availability and consistent manufacturing quality.

Frequently Asked Questions (FAQ)

Q: Can the 7X-1.544MBD-T directly replace the TC-1.544MBD-T without PCB modifications?

A: The 7X-1.544MBD-T maintains identical electrical specifications and package footprint. However, the seated height increases from 0.80mm to 1.10mm. PCB assembly clearance must be verified to ensure no interference with adjacent components or enclosure constraints. No circuit modifications are required.

Q: What is the difference between MEMS and Crystal resonators in these oscillators?

A: The TC-1.544MBD-T uses MEMS technology, while both substitutes use Crystal-based resonators. Both technologies deliver the same frequency stability (±25ppm) and operating temperature range. Crystal-based oscillators are established technology with proven long-term reliability. MEMS oscillators offer compact form factors and lower power consumption in some designs. For this application, both technologies are functionally equivalent.

Q: Which substitute should be selected for power-constrained applications?

A: The ASE-1.544MHZ-LR-T provides the lowest supply current at 7mA maximum and includes specified disable-mode current of 10µA. This part is optimized for applications requiring extended battery life or minimal power draw.

Q: Are there compliance or regulatory differences between the substitutes?

A: The 7X-1.544MBD-T is RoHS Compliant. The ASE-1.544MHZ-LR-T is ROHS3 Compliant, indicating adherence to the most current RoHS directive. Both are REACH Unaffected. Selection depends on the regulatory requirements of the target application and end market.

Q: What is the impact of the height difference on PCB assembly?

A: The TC-1.544MBD-T has a seated height of 0.80mm. The 7X-1.544MBD-T is 1.10mm, and the ASE-1.544MHZ-LR-T is 1.20mm. These differences are within standard PCB assembly tolerances for surface-mount components. Verify clearance with adjacent components, solder mask openings, and enclosure constraints before final selection.

Q: Can both substitutes be used interchangeably in the same design?

A: Both substitutes meet the core electrical and mechanical requirements. However, differences in supply current, disable-mode current, and seated height may affect system performance and PCB layout. Select one substitute based on specific application requirements rather than alternating between them in production.