27 MHz Crystal 18pF SMD Equivalent & Substitute Parts Reference

Part Overview

The TXC CORPORATION 7B26070001 is a 27 MHz fundamental mode crystal oscillator in 4-SMD surface mount package with 18pF load capacitance. This part is classified as obsolete, making substitute components necessary for ongoing production and maintenance applications. The 27 MHz frequency with ±30ppm stability is commonly used in communication and timing circuits requiring precise frequency reference. Equivalent and substitute parts maintain the same electrical specifications and mechanical compatibility while offering active product status and improved availability.

Key Parameters

Parameter	Value	Significance for Substitution
Frequency	27 MHz	Must match exactly
Frequency Stability	±30ppm	Must match or be tighter
Load Capacitance	18pF	Must match exactly
Operating Mode	Fundamental	Determines frequency generation method
Package / Case	4-SMD, No Lead	Must match for PCB compatibility
Operating Temperature	-20°C ~ 70°C	Must meet or exceed range
Mounting Type	Surface Mount	Determines assembly process
RoHS Status	RoHS Compliant	Regulatory requirement
Moisture Sensitivity Level	1 (Unlimited)	Handling and storage requirements

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict matching of the following critical parameters:

Mandatory Match Criteria:

Frequency: 27 MHz (exact)
Load Capacitance: 18pF (exact)
Package / Case: 4-SMD, No Lead (exact)
Frequency Stability: ±30ppm (match or tighter tolerance)
Operating Temperature Range: -20°C ~ 70°C (minimum)
Mounting Type: Surface Mount (exact)

Acceptable Variations:

ESR (Equivalent Series Resistance): May vary; not specified in main part
Physical dimensions: Minor variations acceptable within SMD footprint compatibility
Manufacturer: Different manufacturers acceptable if all electrical parameters match
Product Status: Active status preferred over obsolete

All substitute parts listed meet these criteria and are electrically and mechanically interchangeable with the 7B26070001 in applications requiring 27 MHz ±30ppm crystal oscillators with 18pF load capacitance.

Parameter Comparison

Parameter	7B26070001 (Main)	7M-27.000MAAJ-T	7M27070006	7M27070007	ABM81-27.000MHZ-B4Y-T3
Manufacturer	TXC CORPORATION	TXC CORPORATION	TXC CORPORATION	TXC CORPORATION	Abracon LLC
Frequency	27 MHz	27 MHz	27 MHz	27 MHz	27 MHz
Frequency Stability	±30ppm	±30ppm	±30ppm	±30ppm	±30ppm
Frequency Tolerance	±30ppm	±30ppm	±30ppm	±30ppm	±30ppm
Load Capacitance	18pF	18pF	18pF	18pF	18pF
ESR (Equivalent Series Resistance)	Not specified	60 Ohms	Not specified	Not specified	50 Ohms
Operating Mode	Fundamental	Fundamental	Not specified	Not specified	Fundamental
Operating Temperature	-20°C ~ 70°C	-20°C ~ 70°C	-20°C ~ 70°C	-20°C ~ 70°C	-20°C ~ 70°C
Package / Case	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead
Size / Dimension	5.00mm x 3.20mm	3.20mm x 2.50mm	3.20mm x 2.50mm	3.20mm x 2.50mm	3.20mm x 2.50mm
Height - Seated (Max)	1.05mm	0.80mm	0.80mm	0.80mm	0.70mm
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS Compliant	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not Applicable

Engineering Selection Recommendations

Primary Substitutes (TXC CORPORATION Series):

The 7M-27.000MAAJ-T, 7M27070006, and 7M27070007 are direct substitutes from TXC CORPORATION's active product line. All three maintain identical electrical specifications (27 MHz, ±30ppm, 18pF) and 4-SMD package compatibility. The 7M-27.000MAAJ-T offers the advantage of tape and reel packaging for automated assembly. The 7M27070006 and 7M27070007 provide equivalent performance with active product status and higher inventory availability. These parts are recommended for applications where TXC CORPORATION compatibility is preferred or where existing supply chain relationships exist.

Alternative Substitute (Abracon LLC):

The ABM81-27.000MHZ-B4Y-T3 from Abracon LLC meets all mandatory electrical and mechanical substitution criteria. This part offers ROHS3 compliance (enhanced RoHS standard) and a lower ESR specification (50 Ohms versus 60 Ohms in the 7M-27.000MAAJ-T). The reduced height (0.70mm versus 1.05mm in the main part) provides improved PCB real estate utilization. This substitute is suitable for applications requiring multi-source component qualification or where Abracon LLC parts are already qualified in the design.

Compliance Considerations:

All substitute parts maintain RoHS compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage procedures. The Abracon part's ROHS3 compliance provides enhanced environmental protection standards.

Frequently Asked Questions (FAQ)

Q: Can the 7M-27.000MAAJ-T replace the obsolete 7B26070001 directly?

A: Yes. The 7M-27.000MAAJ-T is electrically and mechanically compatible. Both parts operate at 27 MHz with ±30ppm stability, 18pF load capacitance, and 4-SMD surface mount package. The main difference is product status (active versus obsolete) and packaging format (tape and reel versus bulk).

Q: What is the significance of the different physical dimensions between the main part and substitutes?

A: The main part 7B26070001 measures 5.00mm x 3.20mm with 1.05mm height, while substitute parts measure 3.20mm x 2.50mm with 0.80mm or 0.70mm height. These dimensional differences reflect different product generations within the same package category (4-SMD, No Lead). PCB footprint compatibility must be verified during design review, as the smaller substitute parts may not fit existing PCB layouts designed for the larger main part.

Q: Are there any electrical performance differences between TXC CORPORATION and Abracon LLC substitutes?

A: All parts meet the same frequency (27 MHz) and stability (±30ppm) specifications. The Abracon ABM81-27.000MHZ-B4Y-T3 specifies 50 Ohms ESR, while the TXC 7M-27.000MAAJ-T specifies 60 Ohms ESR. Both ESR values are acceptable for standard 27 MHz crystal applications. ESR differences may affect circuit startup time and power consumption in specific oscillator designs; circuit simulation is recommended if ESR sensitivity is a design concern.

Q: What is the difference between the three TXC CORPORATION 7M series substitutes?

A: The 7M-27.000MAAJ-T, 7M27070006, and 7M27070007 are electrically identical (27 MHz, ±30ppm, 18pF, 4-SMD). The primary difference is packaging: 7M-27.000MAAJ-T is supplied in tape and reel format for automated pick-and-place assembly, while 7M27070006 and 7M27070007 are supplied in bulk packaging. All three are active products with equivalent performance and interchangeability.

Q: Is the Abracon part suitable for high-reliability applications?

A: The ABM81-27.000MHZ-B4Y-T3 meets ROHS3 compliance and maintains the same operating temperature range (-20°C ~ 70°C) and frequency stability (±30ppm) as the main part. Suitability for high-reliability applications depends on specific design requirements and qualification procedures. Component selection should follow established design review and qualification protocols.

Q: Can I use these substitutes interchangeably on the same PCB?

A: Electrical interchangeability is confirmed. However, physical dimension differences (particularly the 5.00mm x 3.20mm main part versus 3.20mm x 2.50mm substitutes) require PCB footprint verification. If the PCB is designed for the larger 7B26070001 footprint, the smaller substitute parts will not fit. PCB redesign or adapter solutions may be necessary for physical compatibility.

Q: What is MSL 1 (Unlimited) moisture sensitivity?

A: MSL 1 indicates the lowest moisture sensitivity level, meaning the component can be stored indefinitely without moisture baking requirements prior to soldering. This simplifies inventory management and reduces manufacturing process complexity compared to higher MSL ratings.

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