TC-19.440MBD-T Equivalent & Substitute Parts

Part Overview

The TC-19.440MBD-T is a 19.44 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, making identification of equivalent and substitute components essential for ongoing system support and new design implementations.

Substiute Parts

TC-19.440MBD-T

TXC CORPORATIONIn Stock: 904TC-19.440MBD-T Datasheet

Current PartRFQ

7X-19.440MBD-T

TXC CORPORATIONIn Stock: 10617X-19.440MBD-T Datasheet

DirectRFQ

FK1940002

Diodes IncorporatedIn Stock: 669FK1940002 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TC-19.440MBD-T is determined by strict alignment of the following parameters:

Critical Matching Parameters:

• Frequency: 19.44 MHz (exact match required)
• Output Type: CMOS
• Supply Voltage: 3.3V
• Function: Enable/Disable
• Frequency Stability: ±25ppm
• Package Type: 4-SMD, No Lead
• Package Dimensions: 0.126" L x 0.098" W (3.20mm x 2.50mm)

Allowable Variations:

• Base Resonator Type: MEMS or Crystal (both acceptable for this frequency and output specification)
• Current Supply (Max): Variation acceptable if within system design margins
• Operating Temperature Range: Variation acceptable if application requirements are met
• Height - Seated (Max): Variation acceptable within PCB assembly constraints
• Product Status: Active status preferred for long-term availability

The two identified substitutes meet all critical matching parameters and represent valid alternatives for component replacement or design continuation.

Parameter Comparison

Engineering Selection Recommendations

7X-19.440MBD-T (TXC CORPORATION)

This part is the primary substitute for the obsolete TC-19.440MBD-T. Both components are manufactured by TXC CORPORATION, ensuring design continuity and supply chain consistency. The 7X-19.440MBD-T is Active status, providing long-term availability. The part meets all critical electrical parameters and maintains identical package dimensions. The 7X series uses a Crystal resonator instead of MEMS, with lower maximum supply current (15mA vs. 25mA) and slightly increased seated height (1.10mm vs. 0.80mm). RoHS Compliance and REACH Unaffected status support regulatory requirements for new designs.

FK1940002 (Diodes Incorporated)

This part provides an alternative substitute from a different manufacturer. The FK1940002 is Active status with full RoHS3 and REACH compliance. All critical electrical parameters match the main part specification. The component features the lowest maximum supply current (10mA) and includes specified disable-mode current (10µA). The operating temperature range is narrower (-20°C ~ 70°C vs. -40°C ~ 85°C), requiring verification against application requirements. Seated height is 1.15mm, requiring PCB assembly clearance confirmation.

Frequently Asked Questions (FAQ)

Q: Can the 7X-19.440MBD-T directly replace the TC-19.440MBD-T without circuit modification?

A: Yes. Both parts share identical frequency (19.44 MHz), output type (CMOS), supply voltage (3.3V), function (Enable/Disable), and package dimensions (3.20mm x 2.50mm). The 7X-19.440MBD-T has lower maximum supply current (15mA vs. 25mA) and increased seated height (1.10mm vs. 0.80mm). Verify PCB assembly clearance for the height difference and confirm system power budget accommodates the lower current specification.

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

A: The TC-19.440MBD-T uses MEMS technology, while the 7X-19.440MBD-T and FK1940002 use Crystal resonators. Both technologies deliver the same frequency stability (±25ppm) and output characteristics for this application. Crystal-based oscillators typically offer lower power consumption, as demonstrated by the reduced maximum supply current in the substitute parts.

Q: Is the FK1940002 suitable for applications requiring -40°C operation?

A: No. The FK1940002 operating temperature range is -20°C ~ 70°C, which does not include -40°C. The TC-19.440MBD-T and 7X-19.440MBD-T both support -40°C ~ 85°C. For applications requiring -40°C operation, use the 7X-19.440MBD-T.

Q: What is the impact of the increased seated height in substitute parts?

A: The TC-19.440MBD-T has a maximum seated height of 0.80mm. The 7X-19.440MBD-T is 1.10mm and the FK1940002 is 1.15mm. Verify PCB layout and assembly clearance to ensure no interference with adjacent components or solder reflow equipment. Height differences may require PCB redesign in space-constrained applications.

Q: Are the substitute parts RoHS compliant?

A: Yes. The 7X-19.440MBD-T is RoHS Compliant. The FK1940002 is ROHS3 Compliant. Both parts are REACH Unaffected. The main part TC-19.440MBD-T does not specify RoHS status.

Q: What is the disable-mode current specification?

A: The TC-19.440MBD-T and 7X-19.440MBD-T do not specify disable-mode current. The FK1940002 specifies 10µA maximum in disable mode. For applications requiring low standby power consumption, the FK1940002 provides documented disable-mode current performance.

Q: Can I use the FK1940002 in a design originally specified for the TC-19.440MBD-T?

A: Electrical compatibility is confirmed for all critical parameters. Verify the following before substitution: (1) Operating temperature range -20°C ~ 70°C meets application requirements; (2) PCB assembly clearance accommodates 1.15mm seated height; (3) Supply current budget accommodates 10mA maximum specification.