7B-12.000MBBK-T Equivalent & Substitute Parts

Part Overview

The 7B-12.000MBBK-T is a 12 MHz fundamental mode crystal oscillator manufactured by TXC CORPORATION, designed for surface mount applications in 4-SMD, No Lead package configuration. This part operates at 12.0000 MHz with ±50ppm frequency stability and 20pF load capacitance. The product is currently classified as Obsolete, making identification of equivalent and substitute parts essential for ongoing design support, production continuity, and component procurement.

Substiute Parts

7B-12.000MBBK-T

TXC CORPORATIONIn Stock: 11447B-12.000MBBK-T Datasheet

Current PartRFQ

7M-12.000MBBK-T

TXC CORPORATIONIn Stock: 6907M-12.000MBBK-T Datasheet

SimilarRFQ

ECS-120-20-33-TR

ECS Inc.In Stock: 22330ECS-120-20-33-TR Datasheet

SimilarRFQ

LFXTAL065111

IQD Frequency ProductsIn Stock: 1048LFXTAL065111 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 7B-12.000MBBK-T is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

• Frequency: 12 MHz (exact match required)
• Frequency Stability: ±50ppm (exact match required)
• Operating Mode: Fundamental (exact match required)
• Operating Temperature Range: -20°C to 70°C (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 4-SMD, No Lead (exact match required)

Secondary Compatibility Parameters:

• Load Capacitance: 20pF (preferred match; minor deviations acceptable within circuit design tolerance)
• ESR: 100 Ohms (preferred match; minor deviations acceptable within circuit design tolerance)

The substitute parts listed below meet all primary substitution criteria. Variations in load capacitance and ESR are noted and must be evaluated within the context of the specific application circuit.

Parameter Comparison

Engineering Selection Recommendations

7M-12.000MBBK-T (TXC CORPORATION)

This part is the direct equivalent from the same manufacturer series. It maintains identical electrical specifications: 12 MHz frequency, ±50ppm stability, 20pF load capacitance, and 100 Ohms ESR. The primary differences are product status (Active vs. Obsolete) and physical dimensions (smaller footprint: 3.20mm x 2.50mm vs. 5.00mm x 3.20mm). This part is suitable for direct substitution where PCB layout accommodates the reduced package size. Active product status ensures long-term availability and supply chain continuity.

ECS-120-20-33-TR (ECS Inc.)

This part meets all primary substitution criteria with identical electrical specifications to the main part. It features the same 12 MHz frequency, ±50ppm stability, 20pF load capacitance, and 100 Ohms ESR. Physical dimensions match the 7M-12.000MBBK-T (3.20mm x 2.50mm). The part is supplied in Tape & Reel packaging and maintains Active product status. ROHS3 compliance provides enhanced environmental certification. Highest inventory availability (22290 Pcs) supports production volume requirements.

LFXTAL065111 (IQD Frequency Products)

This part meets all primary substitution criteria with 12 MHz frequency and ±50ppm stability. Load capacitance is specified at 18pF (versus 20pF) and ESR at 90 Ohms (versus 100 Ohms). Physical dimensions match the main part (5.00mm x 3.20mm). These parameter variations require circuit-level evaluation to confirm compatibility with the oscillator load network. The part is supplied in Tape & Reel packaging with Active product status and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can the 7M-12.000MBBK-T be used as a direct replacement for the 7B-12.000MBBK-T?

A: Yes. Both parts share identical electrical specifications (12 MHz, ±50ppm stability, 20pF load capacitance, 100 Ohms ESR, Fundamental mode, -20°C to 70°C operating range). The primary difference is physical size: the 7M series uses a smaller 3.20mm x 2.50mm footprint compared to the 7B series 5.00mm x 3.20mm footprint. PCB layout must accommodate the reduced dimensions.

Q: What is the difference between the ECS-120-20-33-TR and the main part?

A: The ECS-120-20-33-TR maintains identical electrical specifications and uses the same smaller 3.20mm x 2.50mm package as the 7M-12.000MBBK-T. The primary difference is manufacturer (ECS Inc. versus TXC CORPORATION). Both parts are Active products with full RoHS compliance.

Q: Why does the LFXTAL065111 have different load capacitance and ESR values?

A: The LFXTAL065111 specifies 18pF load capacitance and 90 Ohms ESR, compared to 20pF and 100 Ohms for the main part. These variations are within the tolerance range for 12 MHz crystal oscillators but require verification within the specific application circuit. The oscillator load network design determines whether these parameter variations are acceptable.

Q: What packaging formats are available for these substitute parts?

A: The 7B-12.000MBBK-T is supplied in bulk packaging. The 7M-12.000MBBK-T, ECS-120-20-33-TR, and LFXTAL065111 are all supplied in Tape & Reel (TR) format, which is standard for automated assembly processes.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 7B-12.000MBBK-T is RoHS Compliant. The 7M-12.000MBBK-T is RoHS Compliant. The ECS-120-20-33-TR and LFXTAL065111 are both ROHS3 Compliant, which represents enhanced environmental certification.

Q: Which substitute part has the highest inventory availability?

A: The ECS-120-20-33-TR has the highest inventory availability at 22290 Pcs in stock, followed by the 7M-12.000MBBK-T at 649 Pcs and LFXTAL065111 at 973 Pcs.

Q: Can I use the LFXTAL065111 if my circuit is designed for 20pF load capacitance?

A: The LFXTAL065111 operates at 18pF load capacitance. Circuit compatibility depends on the oscillator load network design. The 2pF difference and 10 Ohms ESR variation must be evaluated within the specific application to confirm acceptable frequency stability and startup characteristics.