7B-13.000MBBK-T Crystal Oscillator Equivalent & Substitute Parts

Part Overview

The 7B-13.000MBBK-T is a 13 MHz fundamental mode crystal oscillator manufactured by TXC CORPORATION, designed for surface mount applications with 20pF load capacitance and 40 Ohms equivalent series resistance (ESR). This component is classified as obsolete product status, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement continuity.

The primary reason for identifying substitute parts is the obsolete status of the 7B series, which may result in limited inventory availability and extended lead times. Equivalent alternatives maintain the same electrical specifications while offering active product status and improved supply chain accessibility.

Substiute Parts

7B-13.000MBBK-T

TXC CORPORATIONIn Stock: 7917B-13.000MBBK-T Datasheet

Current PartRFQ

7M-13.000MBBK-T

TXC CORPORATIONIn Stock: 7477M-13.000MBBK-T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 7B-13.000MBBK-T are identified based on strict electrical and mechanical parameter matching within the allowed tolerance specifications for 13 MHz crystal oscillators. The substitution logic is based on the following critical parameters:

Electrical Parameters (Must Match):

• Frequency: 13.0000 MHz (exact match required)
• Frequency Stability: ±50 ppm (tolerance specification)
• Load Capacitance: 20 pF (circuit design requirement)
• Operating Mode: Fundamental (frequency generation method)

Mechanical Parameters (Must Match):

• Mounting Type: Surface Mount (PCB assembly compatibility)
• Package / Case: 4-SMD, No Lead (footprint compatibility)

Environmental & Compliance Parameters (Must Match or Exceed):

• Operating Temperature Range: -20°C ~ 70°C (minimum requirement)
• RoHS Status: RoHS Compliant (regulatory requirement)
• Moisture Sensitivity Level: 1 (Unlimited) (handling requirement)

Parameter Allowing Variation:

• ESR (Equivalent Series Resistance): Variation permitted within circuit design tolerance. The 7B-13.000MBBK-T specifies 40 Ohms; substitute parts with higher ESR values (such as 100 Ohms) remain functionally compatible provided the oscillator circuit design accommodates the increased resistance value.

Parameter Comparison

Engineering Selection Recommendations

7M-13.000MBBK-T as Primary Substitute:

The 7M-13.000MBBK-T is the qualified substitute for the obsolete 7B-13.000MBBK-T based on the following engineering criteria:

1. Electrical Compatibility: All critical electrical parameters match exactly—frequency (13 MHz), frequency stability (±50 ppm), load capacitance (20 pF), and operating mode (Fundamental). The ESR difference (100 Ohms vs. 40 Ohms) is within acceptable variation for crystal oscillator circuit design.

2. Mechanical Compatibility: Both parts share identical mounting type (Surface Mount) and package configuration (4-SMD, No Lead). The 7M series features a smaller footprint (3.20mm x 2.50mm vs. 5.00mm x 3.20mm) and lower profile (0.80mm vs. 1.05mm), which provides design flexibility for space-constrained applications.

3. Regulatory Compliance: Both parts maintain RoHS Compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring equivalent environmental and regulatory performance.

4. Product Status: The 7M-13.000MBBK-T carries Active product status, providing superior supply chain availability and long-term procurement security compared to the Obsolete 7B series.

5. Inventory Availability: The 7M-13.000MBBK-T maintains 667 pieces in new original stock, supporting immediate procurement requirements.

Design Consideration: Circuit designers must confirm that the oscillator circuit design accommodates the higher ESR value (100 Ohms) of the 7M series. This parameter affects oscillator startup behavior and power consumption characteristics. Standard 13 MHz oscillator circuits typically tolerate ESR values up to 120 Ohms without performance degradation.

Frequently Asked Questions (FAQ)

Q1: Can the 7M-13.000MBBK-T directly replace the 7B-13.000MBBK-T without circuit modification?

A: The 7M-13.000MBBK-T is electrically and mechanically compatible with the 7B-13.000MBBK-T for most applications. Both parts share identical frequency (13 MHz), frequency stability (±50 ppm), load capacitance (20 pF), and package configuration (4-SMD, No Lead). The primary difference is ESR (100 Ohms vs. 40 Ohms). Standard oscillator circuits designed for 13 MHz operation typically accommodate this ESR variation without modification. However, circuit designers should verify that the oscillator circuit design specifications allow for the higher ESR value.

Q2: What is the significance of the ESR difference between these parts?

A: ESR (Equivalent Series Resistance) affects crystal oscillator startup time and power consumption. The 7M-13.000MBBK-T has higher ESR (100 Ohms) compared to the 7B-13.000MBBK-T (40 Ohms). Higher ESR requires slightly more drive power from the oscillator circuit but remains within acceptable limits for standard 13 MHz applications. The oscillator circuit must be designed to support the specified ESR range.

Q3: Are there physical footprint differences between these parts?

A: Yes. The 7M-13.000MBBK-T has a smaller footprint (3.20mm x 2.50mm) and lower profile (0.80mm) compared to the 7B-13.000MBBK-T (5.00mm x 3.20mm, 1.05mm height). Both use identical 4-SMD, No Lead package configuration. The smaller 7M series dimensions provide design flexibility for space-constrained PCB layouts. Existing PCB designs with footprints for the 7B series can accommodate the smaller 7M series component.

Q4: Do both parts meet the same regulatory and environmental requirements?

A: Yes. Both the 7B-13.000MBBK-T and 7M-13.000MBBK-T are RoHS Compliant and carry MSL Level 1 (Unlimited) moisture sensitivity rating. Both operate across the identical temperature range (-20°C ~ 70°C). Environmental and regulatory performance is equivalent.

Q5: Why is the 7B series marked as Obsolete?

A: The 7B series is classified as Obsolete product status, indicating that TXC CORPORATION has discontinued active manufacturing and support for this series. The 7M series represents the current active product line for equivalent 13 MHz crystal oscillators. Obsolete status typically results in limited inventory availability and extended procurement lead times.

Q6: What inventory status should I expect for each part?

A: The 7B-13.000MBBK-T (Obsolete) has 723 pieces in new original stock. The 7M-13.000MBBK-T (Active) has 667 pieces in new original stock. For long-term procurement planning, the Active 7M series provides superior supply chain continuity and availability.