AC-4.000MAE-T Equivalent & Substitute Parts

Part Overview

The AC-4.000MAE-T is a 4 MHz crystal oscillator (XO) manufactured by TXC CORPORATION, designed for applications requiring a standard CMOS output oscillator with enable/disable functionality. This part operates at 5V supply voltage and is housed in a 4-SMD, No Lead surface mount package.

The AC-4.000MAE-T is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for legacy systems utilizing this oscillator frequency and electrical specification.

Substiute Parts

AC-4.000MAE-T

TXC CORPORATIONIn Stock: 788AC-4.000MAE-T Datasheet

Current PartRFQ

FD0400028Q

Diodes IncorporatedIn Stock: 2015FD0400028Q Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AC-4.000MAE-T is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 4.0000 MHz (exact match required)
• Output: CMOS logic level
• Supply Voltage: 5V
• Function: Enable/Disable capability
• Package: 4-SMD, No Lead form factor
• Dimensions: 5.00 mm × 3.20 mm footprint
• Operating Temperature: -40°C to +85°C minimum range
• Frequency Stability: ±50 ppm or better

The FD0400028Q from Diodes Incorporated meets all mandatory matching parameters and qualifies as a direct substitute. Both parts share identical frequency, output type, supply voltage, enable/disable function, package configuration, and dimensional specifications. The substitute part maintains compatibility with the original design while offering active product status and improved supply availability.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: FD0400028Q

The FD0400028Q is the recommended substitute for the AC-4.000MAE-T based on the following engineering criteria:

1. Electrical Equivalence: All critical electrical parameters match exactly, including frequency, output type, supply voltage, stability, and operating temperature range.

2. Physical Compatibility: Identical package footprint (5.00 mm × 3.20 mm, 4-SMD No Lead) ensures direct PCB layout compatibility without redesign.

3. Functional Equivalence: Enable/Disable function is preserved, maintaining circuit control requirements.

4. Compliance Status: The FD0400028Q holds active product status with ROHS3 compliance, providing superior long-term supply chain security compared to the obsolete AC-4.000MAE-T.

5. Performance Advantage: The substitute part demonstrates lower maximum supply current (15 mA vs. 20 mA) and includes disable mode current specification (10 µA), offering potential power consumption benefits in battery-operated or low-power applications.

6. Regulatory Alignment: Both parts carry identical ECCN and HTSUS classifications, maintaining regulatory consistency.

Frequently Asked Questions (FAQ)

Q: Can the FD0400028Q be used as a direct replacement for the AC-4.000MAE-T without PCB modifications?

A: Yes. Both parts share identical package dimensions (5.00 mm × 3.20 mm), footprint configuration (4-SMD No Lead), and pin assignments. No PCB layout changes are required for substitution.

Q: Are there electrical performance differences between these parts?

A: Both parts meet the same frequency (4.0000 MHz), stability (±50 ppm), output type (CMOS), supply voltage (5V), and operating temperature range (-40°C to +85°C). The FD0400028Q operates at lower maximum supply current (15 mA vs. 20 mA), which may reduce power consumption in applications with continuous oscillator operation.

Q: What is the significance of the product status difference?

A: The AC-4.000MAE-T is classified as obsolete, indicating discontinued manufacturing and limited future availability. The FD0400028Q maintains active product status, ensuring reliable long-term supply and continued manufacturer support.

Q: Does the FD0400028Q meet the same compliance requirements?

A: Both parts are RoHS compliant and carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications. The FD0400028Q additionally specifies ROHS3 compliance and REACH Unaffected status, providing enhanced regulatory documentation.

Q: Are there any height or dimensional constraints to consider?

A: The FD0400028Q seated height is 1.35 mm compared to 1.40 mm for the AC-4.000MAE-T. This 0.05 mm reduction is within standard PCB assembly tolerances and does not affect component placement or clearance in typical applications.

Q: What packaging options are available for the FD0400028Q?

A: The FD0400028Q is supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes. Verify packaging format compatibility with your procurement and assembly requirements.