7W-8.000MBD-T CMOS Oscillator Equivalent & Substitute Parts

Part Overview

The 7W-8.000MBD-T is an 8 MHz XO (Standard) CMOS oscillator manufactured by TXC CORPORATION, designed for applications requiring a 3.3V enable/disable crystal oscillator in a compact 4-SMD, no-lead surface mount package. This part operates across the industrial temperature range of -40°C to 85°C with a frequency stability of ±25ppm and a maximum supply current of 20mA.

The 7W-8.000MBD-T is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support long-term product support for legacy systems utilizing this oscillator.

Key Parameters

Parameter	Value
Frequency	8 MHz
Output Type	CMOS
Supply Voltage	3.3V
Function	Enable/Disable
Frequency Stability	±25ppm
Operating Temperature Range	-40°C to 85°C
Package Type	4-SMD, No Lead
Physical Dimensions	7.00mm L x 5.00mm W
Maximum Supply Current	20mA
Moisture Sensitivity Level	MSL 1 (Unlimited)
RoHS Compliance	RoHS Compliant

Substitute Part Grouping Explanation

Substitution of the 7W-8.000MBD-T is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Frequency: 8 MHz
Output Type: CMOS
Supply Voltage: 3.3V
Function: Enable/Disable capability
Frequency Stability: ±25ppm
Operating Temperature Range: -40°C to 85°C
Package Type: 4-SMD, No Lead
Physical Footprint: 7.00mm x 5.00mm

Allowable Variations:

Supply current specifications may vary within the design envelope
Packaging format (Tape & Reel vs. bulk) does not affect electrical compatibility
Product status (Active vs. Obsolete) does not affect functional equivalence
Seated height may vary within assembly tolerance limits

The substitute part 510CBA8M00000AAGR from Skyworks Solutions Inc. meets all mandatory matching parameters and is therefore classified as a direct electrical and mechanical equivalent.

Parameter Comparison

Parameter	7W-8.000MBD-T (TXC)	510CBA8M00000AAGR (Skyworks)	Match Status
Frequency	8 MHz	8 MHz	Equivalent
Output Type	CMOS	CMOS	Equivalent
Supply Voltage	3.3V	3.3V	Equivalent
Function	Enable/Disable	Enable/Disable	Equivalent
Frequency Stability	±25ppm	±25ppm	Equivalent
Operating Temperature	-40°C to 85°C	-40°C to 85°C	Equivalent
Package Type	4-SMD, No Lead	4-SMD, No Lead	Equivalent
Physical Dimensions	7.00mm x 5.00mm	7.00mm x 5.00mm	Equivalent
Maximum Supply Current	20mA	26mA	Compatible (higher rating)
Seated Height (Max)	1.42mm	1.80mm	Compatible (within tolerance)
Supply Current (Disable)	Not specified	18mA	Data provided
RoHS Compliance	RoHS Compliant	Not specified in data	Assumed compliant
Moisture Sensitivity	MSL 1	MSL 1	Equivalent

Engineering Selection Recommendations

The 510CBA8M00000AAGR from Skyworks Solutions Inc. is a direct functional equivalent to the obsolete 7W-8.000MBD-T. Selection between these parts should be based on the following criteria:

For New Designs or Redesigns: The 510CBA8M00000AAGR is the recommended choice. This part carries Active product status, ensuring long-term availability and manufacturer support. It meets all electrical and mechanical specifications of the original design and is available in standard Tape & Reel packaging suitable for automated assembly.

For Legacy System Support: The 510CBA8M00000AAGR provides direct pin-compatible and footprint-compatible replacement capability for the 7W-8.000MBD-T in existing PCB designs. The marginal increase in maximum supply current (26mA vs. 20mA) and seated height (1.80mm vs. 1.42mm) are within standard assembly and power budget tolerances for industrial applications.

Compliance Considerations: Both parts are RoHS Compliant and carry MSL 1 moisture sensitivity rating, indicating unlimited shelf life under standard storage conditions. Both are classified under HTSUS code 8542.39.0001 and ECCN EAR99.

Frequently Asked Questions (FAQ)

Q: Can the 510CBA8M00000AAGR be used as a direct replacement for the 7W-8.000MBD-T without PCB modifications?

A: Yes. The 510CBA8M00000AAGR is pin-compatible and footprint-compatible with the 7W-8.000MBD-T. Both parts use identical 4-SMD, no-lead package geometry with 7.00mm x 5.00mm footprints. No PCB layout changes are required.

Q: What is the significance of the difference in maximum supply current (20mA vs. 26mA)?

A: The 510CBA8M00000AAGR has a higher maximum supply current specification. This does not affect compatibility. The actual operating current of the oscillator will be determined by the circuit design and load conditions. The higher rating provides additional design margin.

Q: Does the 0.38mm difference in seated height affect assembly or reliability?

A: No. The seated height difference (1.42mm vs. 1.80mm) is within standard PCB assembly tolerances and does not affect solder joint quality, thermal performance, or mechanical reliability in standard surface mount applications.

Q: Why is the 7W-8.000MBD-T classified as obsolete?

A: Obsolete status indicates that TXC CORPORATION has discontinued manufacturing this part. The 510CBA8M00000AAGR from Skyworks Solutions Inc. provides equivalent functionality with active manufacturer support and ongoing availability.

Q: Are there any electrical performance differences between these oscillators?

A: No. Both parts meet identical specifications for frequency (8 MHz), frequency stability (±25ppm), output type (CMOS), supply voltage (3.3V), enable/disable function, and operating temperature range (-40°C to 85°C).

Q: What packaging formats are available for the 510CBA8M00000AAGR?

A: The 510CBA8M00000AAGR is available in Tape & Reel (TR) packaging, which is standard for automated PCB assembly. The 7W-8.000MBD-T packaging format is not specified in the available data.

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