7B-13.560MBBK-T Crystal Equivalent & Substitute Parts

Part Overview

The 7B-13.560MBBK-T is a 13.56 MHz fundamental mode crystal oscillator manufactured by TXC CORPORATION, designed for surface mount applications requiring precise frequency control. This component operates at 13.56 MHz with ±50ppm frequency stability and 20pF load capacitance in a compact 4-SMD, No Lead package measuring 5.00mm × 3.20mm.

The 7B-13.560MBBK-T is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure continued design support, maintain supply chain reliability, and enable component procurement for legacy system maintenance and new production runs.

Substiute Parts

7B-13.560MBBK-T

TXC CORPORATIONIn Stock: 9797B-13.560MBBK-T Datasheet

Current PartRFQ

7M-13.560MBBK-T

TXC CORPORATIONIn Stock: 10677M-13.560MBBK-T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 7B-13.560MBBK-T are identified based on strict parameter matching across the following critical criteria:

Mandatory Matching Parameters:

• Frequency: 13.56 MHz (exact match required)
• Frequency Stability: ±50ppm (exact match required)
• Load Capacitance: 20pF (exact match required)
• Operating Mode: Fundamental (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 4-SMD, No Lead (exact match required)
• Operating Temperature Range: -20°C ~ 70°C (minimum required)
• RoHS Compliance: Required

Allowable Variation Parameters:

• ESR (Equivalent Series Resistance): Variation permitted within component design specifications
• Physical Dimensions: Variation permitted provided package classification remains 4-SMD, No Lead
• Product Status: Active status preferred for ongoing availability; obsolete status acceptable for legacy applications
• Moisture Sensitivity Level: MSL 1 (Unlimited) acceptable

The 7M-13.560MBBK-T qualifies as a substitute part based on full compliance with all mandatory matching parameters.

Parameter Comparison

Engineering Selection Recommendations

7M-13.560MBBK-T as Primary Substitute:

The 7M-13.560MBBK-T is the qualified substitute for the obsolete 7B-13.560MBBK-T based on the following engineering criteria:

1. Frequency and Stability Match: Both parts operate at 13.56 MHz with ±50ppm frequency stability, ensuring identical timing performance in circuit applications.

2. Load Capacitance Compatibility: Both parts specify 20pF load capacitance, confirming direct compatibility with existing oscillator circuit designs without modification.

3. Operating Mode and Temperature: Both parts operate in fundamental mode across the identical temperature range of -20°C to 70°C, maintaining functional equivalence across environmental conditions.

4. Package and Mounting: Both parts use 4-SMD, No Lead surface mount packaging, enabling direct PCB layout compatibility.

5. Regulatory Compliance: Both parts are RoHS Compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting current regulatory requirements.

6. Product Status Advantage: The 7M-13.560MBBK-T holds Active product status, ensuring long-term availability and supply chain continuity compared to the obsolete 7B series.

ESR Variation Consideration:

The 7M-13.560MBBK-T specifies 100 Ohms ESR compared to 40 Ohms for the 7B-13.560MBBK-T. This higher ESR value remains within acceptable parameters for 13.56 MHz crystal applications and does not compromise circuit functionality when the oscillator circuit is properly designed for the specified load capacitance.

Physical Dimension Variation:

The 7M-13.560MBBK-T features a smaller footprint (3.20mm × 2.50mm) and lower profile (0.80mm) compared to the 7B series (5.00mm × 3.20mm, 1.05mm height). PCB layout verification is required to confirm that the reduced dimensions do not conflict with existing component placement or clearance requirements.

Frequently Asked Questions (FAQ)

Q: Can the 7M-13.560MBBK-T be used as a direct replacement for the 7B-13.560MBBK-T without circuit modification?

A: Yes. Both parts share identical frequency (13.56 MHz), frequency stability (±50ppm), load capacitance (20pF), operating mode (Fundamental), and temperature range (-20°C to 70°C). The higher ESR value of the 7M series does not require circuit modification when the oscillator is designed for the specified 20pF load capacitance. PCB layout verification is necessary only to confirm that the smaller physical dimensions do not create placement conflicts.

Q: What is the significance of the ESR difference between the two parts?

A: ESR (Equivalent Series Resistance) affects crystal startup behavior and oscillation stability. The 7M-13.560MBBK-T specifies 100 Ohms ESR compared to 40 Ohms for the 7B series. This difference is within acceptable design margins for 13.56 MHz fundamental mode crystals and does not compromise circuit performance when the oscillator circuit is properly designed for the specified 20pF load capacitance.

Q: Are there any PCB layout considerations when substituting the 7M-13.560MBBK-T?

A: The 7M-13.560MBBK-T features a smaller footprint (3.20mm × 2.50mm) and lower profile (0.80mm) compared to the 7B series (5.00mm × 3.20mm, 1.05mm height). Verify that the reduced dimensions do not conflict with existing component placement, solder pad spacing, or clearance requirements on the PCB. Both parts use identical 4-SMD, No Lead package classification, ensuring electrical compatibility.

Q: What is the advantage of selecting the 7M-13.560MBBK-T over the obsolete 7B series?

A: The 7M-13.560MBBK-T holds Active product status, ensuring long-term availability and supply chain continuity. The 7B-13.560MBBK-T is classified as Obsolete, which limits future procurement options and may result in extended lead times or unavailability. Both parts are RoHS Compliant and meet current regulatory requirements.

Q: Are both parts suitable for applications requiring RoHS compliance?

A: Yes. Both the 7B-13.560MBBK-T and 7M-13.560MBBK-T are RoHS Compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting current regulatory requirements for lead-free and restricted substance compliance.

Q: Can the 7M-13.560MBBK-T be used in legacy systems originally designed with the 7B series?

A: Yes, provided that PCB layout verification confirms the smaller physical dimensions do not create placement conflicts. All electrical parameters, frequency specifications, and operating characteristics are identical, ensuring functional equivalence in legacy system applications.