TXC CORPORATION 7B20000050 Crystal Equivalent & Substitute Parts

Part Overview

The TXC CORPORATION 7B20000050 is a 20 MHz fundamental mode crystal oscillator with 20pF load capacitance, designed for surface mount applications in 4-SMD, No Lead package configuration. This part operates across the -20°C to 70°C temperature range with ±20ppm frequency stability and 40 Ohms equivalent series resistance.

The 7B20000050 is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and field replacement applications.

Substiute Parts

7B20000050

TXC CORPORATIONIn Stock: 11017B20000050 Datasheet

Current PartRFQ

7V-20.000MDDJ-T

TXC CORPORATIONIn Stock: 10207V-20.000MDDJ-T Datasheet

SimilarRFQ

RH100-20.000-18-2020-TR

Raltron ElectronicsIn Stock: 2168RH100-20.000-18-2020-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 7B20000050 is determined by the following critical parameters that must remain constant or within acceptable engineering tolerances:

Mandatory Matching Parameters:

• Frequency: 20 MHz (exact match required)
• Frequency Stability: ±20ppm (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)

Allowable Variation Parameters:

• Load Capacitance: 20pF (main part) to 18pF (substitute parts) — variation acceptable within crystal design specifications
• ESR: 40 Ohms (main part) to 60-70 Ohms (substitute parts) — variation acceptable within circuit tolerance limits
• Physical Dimensions: Minor variations acceptable provided package footprint compatibility is maintained
• Product Status: Active status preferred over obsolete for long-term availability

The two identified substitute parts meet all mandatory matching parameters while demonstrating acceptable variations in load capacitance and ESR characteristics.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: RH100-20.000-18-2020-TR (Raltron Electronics)

The RH100-20.000-18-2020-TR is the preferred substitute for the obsolete 7B20000050. This part maintains all mandatory electrical parameters including 20 MHz frequency, ±20ppm stability, fundamental operating mode, and -20°C to 70°C temperature range. The RH100 series demonstrates active product status with ROHS3 compliance certification and REACH unaffected status, ensuring long-term availability and regulatory compliance. Inventory availability of 2068 pieces supports production requirements. The 18pF load capacitance and 70 Ohms ESR variation from the main part are within acceptable engineering tolerances for crystal oscillator circuit design.

Secondary Substitute: 7V-20.000MDDJ-T (TXC CORPORATION)

The 7V-20.000MDDJ-T provides an alternative substitute from the same manufacturer as the main part. This part maintains identical electrical specifications for frequency, stability, operating mode, and temperature range. Active product status and Tape & Reel packaging support production workflows. The 18pF load capacitance and 60 Ohms ESR represent acceptable variations. Physical dimensions are reduced compared to the main part (3.20mm x 2.50mm versus 5.00mm x 3.20mm), which may require PCB layout verification for footprint compatibility.

Selection Criteria:

• For new production designs: RH100-20.000-18-2020-TR offers superior long-term availability and regulatory compliance
• For direct replacement in existing designs: 7V-20.000MDDJ-T maintains TXC CORPORATION manufacturer continuity
• Both substitutes require circuit validation to confirm load capacitance and ESR compatibility with oscillator circuit design parameters

Frequently Asked Questions (FAQ)

Q: Can the 7V-20.000MDDJ-T be used as a direct replacement for the 7B20000050?

A: The 7V-20.000MDDJ-T meets all mandatory electrical parameters (20 MHz frequency, ±20ppm stability, fundamental mode, -20°C to 70°C operation). The 18pF load capacitance differs from the 20pF specification of the main part. Circuit validation is required to confirm the oscillator circuit can operate within the 18pF load capacitance specification. Physical dimensions are smaller (3.20mm x 2.50mm versus 5.00mm x 3.20mm), requiring PCB footprint verification.

Q: What is the difference between the 7B20000050 and RH100-20.000-18-2020-TR?

A: Both parts share identical frequency (20 MHz), frequency stability (±20ppm), operating mode (fundamental), and temperature range (-20°C to 70°C). The RH100 has 18pF load capacitance versus 20pF, and 70 Ohms ESR versus 40 Ohms. The RH100 is manufactured by Raltron Electronics rather than TXC CORPORATION and carries active product status with ROHS3 compliance. Physical dimensions are smaller for the RH100 (3.20mm x 2.50mm).

Q: Why does the 7B20000050 show obsolete status?

A: The 7B20000050 is classified as obsolete product status, indicating it is no longer in active production. The identified substitute parts (7V-20.000MDDJ-T and RH100-20.000-18-2020-TR) both carry active product status and are recommended for new designs and long-term production requirements.

Q: Are there compliance differences between the substitute parts?

A: The 7B20000050 and 7V-20.000MDDJ-T are both RoHS Compliant. The RH100-20.000-18-2020-TR carries ROHS3 Compliant certification, representing a more current regulatory standard. The RH100 also includes REACH Unaffected status. All three parts are MSL 1 (Unlimited) and carry EAR99 ECCN classification.

Q: What is the impact of load capacitance variation between 20pF and 18pF?

A: Load capacitance affects crystal oscillator frequency stability and startup characteristics. The 2pF reduction from 20pF to 18pF in the substitute parts requires circuit validation. The oscillator circuit design must confirm operation within the 18pF load capacitance specification. Frequency trimming or circuit adjustment may be necessary.

Q: What is the significance of ESR variation from 40 Ohms to 60-70 Ohms?

A: Equivalent Series Resistance affects crystal oscillator power consumption and startup time. The increase from 40 Ohms (main part) to 60 Ohms (7V-20.000MDDJ-T) or 70 Ohms (RH100-20.000-18-2020-TR) requires circuit validation. The oscillator circuit must confirm stable operation within the higher ESR specification.

Q: Are the physical dimension differences significant?

A: The main part (7B20000050) measures 5.00mm x 3.20mm with 1.05mm maximum seated height. Both substitute parts measure 3.20mm x 2.50mm with reduced heights (0.90mm and 0.80mm respectively). PCB layout and footprint compatibility must be verified before substitution. Smaller dimensions may provide design flexibility but require layout validation.

Q: Which substitute part should be selected for new production?

A: The RH100-20.000-18-2020-TR is recommended for new production designs based on active product status, ROHS3 compliance, REACH unaffected status, and superior inventory availability (2068 pieces). The 7V-20.000MDDJ-T is suitable for designs requiring TXC CORPORATION manufacturer continuity.