36 MHz Crystal 20pF SMD Equivalent & Substitute Parts: 7B-36.000MBBK-T

Part Overview

The 7B-36.000MBBK-T is a 36 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 36.0000 MHz with ±50ppm frequency stability and 20pF load capacitance. The product is currently listed as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity. Alternative parts maintain identical or compatible electrical and mechanical specifications while offering active product status and improved availability.

Substiute Parts

7B-36.000MBBK-T

TXC CORPORATIONIn Stock: 9797B-36.000MBBK-T Datasheet

Current PartRFQ

7M-36.000MBBK-T

TXC CORPORATIONIn Stock: 7637M-36.000MBBK-T Datasheet

SimilarRFQ

ECS-360-20-33-TR

ECS Inc.In Stock: 2022ECS-360-20-33-TR Datasheet

SimilarRFQ

7B-36.000MBBK-T

FTSIn Stock: 21697B-36.000MBBK-T Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 7B-36.000MBBK-T are classified into two categories based on substitution compatibility:

Direct Electrical Equivalents: Parts maintaining identical electrical specifications (36 MHz frequency, ±50ppm stability, 20pF load capacitance, 40 Ohms ESR, fundamental mode operation, -20°C ~ 70°C temperature range) with compatible mechanical packaging (4-SMD, No Lead surface mount).

Parametric Equivalents with Minor Variations: Parts matching all critical electrical parameters but with acceptable variations in secondary characteristics such as ESR (60 Ohms vs. 40 Ohms) or physical dimensions, provided the package remains 4-SMD, No Lead surface mount configuration.

Substitution Criteria (All Must Be Satisfied):

• Frequency: 36.0000 MHz (exact match required)
• Frequency Stability: ±50ppm or better
• Load Capacitance: 20pF (exact match required)
• Operating Mode: Fundamental (exact match required)
• Operating Temperature: -20°C ~ 70°C minimum (equal or wider range acceptable)
• Mounting Type: Surface Mount (exact match required)
• Package: 4-SMD, No Lead (exact match required)
• RoHS Compliance: Required for regulatory alignment

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 7B-36.000MBBK-T (FTS)

The FTS-manufactured 7B-36.000MBBK-T represents the optimal substitute for the obsolete TXC CORPORATION original. This part maintains identical electrical specifications (36 MHz, ±50ppm stability, 20pF load capacitance, 40 Ohms ESR) and mechanical dimensions (5.00mm x 3.20mm, 1.05mm height). The part carries active product status with 2108 pieces in stock, ensuring long-term procurement availability. RoHS compliance and MSL 1 rating match the original specification. Physical footprint compatibility eliminates PCB redesign requirements.

Secondary Recommendation: ECS-360-20-33-TR (ECS Inc.)

The ECS-360-20-33-TR provides full electrical equivalence with identical ESR (40 Ohms) and all critical parameters. This part is manufactured by ECS Inc. with active product status and highest inventory availability (1979 pieces). ROHS3 compliance exceeds RoHS requirements. Physical dimensions differ (3.20mm x 2.50mm vs. 5.00mm x 3.20mm) and height is reduced (0.80mm vs. 1.05mm), requiring PCB footprint verification and potential layout modification. Suitable for new designs or PCB revisions.

Tertiary Recommendation: 7M-36.000MBBK-T (TXC CORPORATION)

The 7M-36.000MBBK-T maintains TXC CORPORATION manufacturing continuity with active product status and 740 pieces in stock. All electrical parameters match except ESR (60 Ohms vs. 40 Ohms), which represents a 50% increase. This variation affects circuit impedance matching and may require oscillator circuit tuning verification. Physical dimensions are reduced (3.20mm x 2.50mm, 0.80mm height), necessitating PCB footprint assessment. Suitable only when ESR tolerance and physical space constraints permit.

Selection Criteria Summary:

• No PCB modification required: Select 7B-36.000MBBK-T (FTS)
• PCB redesign acceptable, maximum availability required: Select ECS-360-20-33-TR
• TXC CORPORATION continuity preferred, ESR variation acceptable: Select 7M-36.000MBBK-T

Frequently Asked Questions (FAQ)

Q1: Can the 7M-36.000MBBK-T substitute for the 7B-36.000MBBK-T despite the 60 Ohms ESR difference?

A: The 7M-36.000MBBK-T meets all critical electrical parameters (36 MHz frequency, ±50ppm stability, 20pF load capacitance, fundamental mode, -20°C ~ 70°C temperature range). The ESR increase from 40 Ohms to 60 Ohms represents a secondary parameter variation. Substitution is electrically valid provided the oscillator circuit design accommodates the higher ESR. Circuit simulation or bench testing is necessary to confirm performance within specification.

Q2: What are the physical footprint implications of selecting ECS-360-20-33-TR?

A: The ECS-360-20-33-TR uses a smaller 3.20mm x 2.50mm footprint with 0.80mm maximum height, compared to the original 5.00mm x 3.20mm footprint with 1.05mm height. If the PCB layout includes dedicated pads for the larger 5.00mm x 3.20mm package, the smaller component will not align with existing footprints. PCB redesign is required to accommodate the smaller package dimensions. Alternatively, use the FTS 7B-36.000MBBK-T to maintain original footprint compatibility.

Q3: Are all substitute parts RoHS compliant?

A: Yes. The 7B-36.000MBBK-T (FTS) and 7M-36.000MBBK-T carry RoHS Compliant status. The ECS-360-20-33-TR carries ROHS3 Compliant status, which represents an enhanced RoHS standard. All parts satisfy RoHS regulatory requirements for lead-free and restricted substance compliance.

Q4: Which substitute part offers the best long-term availability?

A: The 7B-36.000MBBK-T (FTS) provides 2108 pieces in current inventory with active product status, representing the highest availability. The ECS-360-20-33-TR follows with 1979 pieces. Both parts are actively manufactured and represent suitable long-term procurement options for the obsolete TXC CORPORATION original.

Q5: Can I use multiple substitute parts interchangeably in production?

A: No. Each substitute part has distinct physical dimensions and ESR characteristics. Production designs must standardize on a single substitute part to ensure consistent PCB assembly, testing procedures, and performance validation. Mixing substitute parts across production batches introduces variability in footprint compatibility and circuit performance.

Q6: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 (Unlimited) indicates the component has no moisture sensitivity limitations. The part does not require special dry-pack storage, desiccant handling, or bake-out procedures before soldering. All substitute parts carry MSL 1 rating, matching the original specification and simplifying supply chain logistics.

Q7: How do I verify ESR compatibility in my circuit design?

A: ESR affects oscillator startup time, frequency stability, and power consumption. Consult your oscillator IC datasheet for maximum ESR specification. The original 7B-36.000MBBK-T specifies 40 Ohms ESR. The 7M-36.000MBBK-T at 60 Ohms ESR remains within typical oscillator IC tolerances (commonly 100+ Ohms maximum). Verify your specific IC requirements before substitution.

Q8: Are there packaging format differences between substitute parts?

A: Yes. The original 7B-36.000MBBK-T uses unspecified packaging. The 7M-36.000MBBK-T is supplied in Tape & Reel (TR) format. The ECS-360-20-33-TR is supplied in Cut Tape (CT) format. The FTS 7B-36.000MBBK-T is supplied in Tape & Reel (TR) format. Packaging format affects component handling, pick-and-place machine compatibility, and storage. Verify your assembly process requirements before final part selection.