TXC CORPORATION 7B50000003 50 MHz Crystal Equivalent & Substitute Parts

Part Overview

The TXC CORPORATION 7B50000003 is a 50 MHz fundamental mode crystal oscillator in 4-SMD surface mount package with 16pF load capacitance and 40 Ohms equivalent series resistance. This part operates across the industrial temperature range of -40°C to 85°C with ±30ppm frequency stability and is RoHS compliant with MSL 1 rating.

The 7B50000003 is classified as obsolete product status. Substitute parts are necessary to maintain design continuity and ensure ongoing component availability for new production builds and field replacements.

Key Parameters

Parameter	Value
Frequency	50 MHz
Frequency Stability	±30ppm
Load Capacitance	16pF
ESR (Equivalent Series Resistance)	40 Ohms
Operating Mode	Fundamental
Operating Temperature Range	-40°C to 85°C
Mounting Type	Surface Mount
Package / Case	4-SMD, No Lead
Size / Dimension	5.00mm x 3.20mm
RoHS Status	RoHS Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 7B50000003 is determined by the following critical parameters:

Primary Matching Criteria:

Frequency: 50 MHz (exact match required)
Frequency Stability: ±30ppm (exact match required)
Operating Mode: Fundamental (exact match required)
Operating Temperature: -40°C to 85°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: 16pF (preferred match; 12pF, 18pF, 20pF acceptable with circuit design verification)
ESR: 40 Ohms (preferred match; 60 Ohms acceptable with circuit design verification)
Size / Dimension: 3.20mm x 2.50mm (smaller than original; acceptable for space-constrained applications)
Product Status: Active status preferred for long-term availability

Substitute parts must maintain RoHS compliance and MSL 1 rating. All identified substitutes meet these core requirements.

Parameter Comparison

Part Number	Manufacturer	Frequency	Frequency Stability	Load Capacitance	ESR (Ohms)	Operating Temperature	Package	Size (mm)	Product Status	RoHS Status
7B50000003	TXC CORPORATION	50 MHz	±30ppm	16pF	40	-40°C to 85°C	4-SMD, No Lead	5.00 x 3.20	Obsolete	RoHS Compliant
7M-50.000MAHI-T	TXC CORPORATION	50 MHz	±30ppm	16pF	60	-40°C to 85°C	4-SMD, No Lead	3.20 x 2.50	Active	RoHS Compliant
7M-50.000MAHE-T	TXC CORPORATION	50 MHz	±30ppm	12pF	60	-40°C to 85°C	4-SMD, No Lead	3.20 x 2.50	Active	RoHS Compliant
7M-50.000MAHJ-T	TXC CORPORATION	50 MHz	±30ppm	18pF	60	-40°C to 85°C	4-SMD, No Lead	3.20 x 2.50	Active	RoHS Compliant
7M-50.000MAHK-T	TXC CORPORATION	50 MHz	±30ppm	20pF	60	-40°C to 85°C	4-SMD, No Lead	3.20 x 2.50	Active	RoHS Compliant
7V-50.000MAHE-T	TXC CORPORATION	50 MHz	±30ppm	12pF	60	-40°C to 85°C	4-SMD, No Lead	3.20 x 2.50	Active	RoHS Compliant
FL5000063Z	Diodes Incorporated	50 MHz	±30ppm	18pF	40	-40°C to 85°C	4-SMD, No Lead	3.20 x 2.50	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute (Exact Load Capacitance Match):

The 7M-50.000MAHI-T is the recommended primary substitute. This part maintains the 16pF load capacitance specification of the original 7B50000003, ensuring direct functional equivalence. The 7M-50.000MAHI-T is active product status with full RoHS compliance and MSL 1 rating. The increased ESR of 60 Ohms versus 40 Ohms requires circuit design verification but is within acceptable tolerance for 50 MHz fundamental mode operation. The smaller physical footprint (3.20mm x 2.50mm versus 5.00mm x 3.20mm) provides space optimization benefits.

Alternative Substitute (Cross-Manufacturer Option):

The FL5000063Z from Diodes Incorporated provides an alternative from a different manufacturer. This part matches the original 40 Ohms ESR specification exactly and maintains 16pF load capacitance compatibility through its 18pF rating. The FL5000063Z is active product status with ROHS3 compliance and MSL 1 rating. Cross-manufacturer substitution provides supply chain diversification and extended availability.

Load Capacitance Variants (Circuit Design Dependent):

The 7M-50.000MAHE-T (12pF) and 7M-50.000MAHJ-T (18pF) and 7M-50.000MAHK-T (20pF) are available for applications where load capacitance adjustment is required. These parts are active status with full compliance ratings. Selection among these variants depends on specific circuit load capacitance requirements and oscillator tuning range specifications.

Series Variant:

The 7V-50.000MAHE-T represents an alternative series option with identical electrical specifications to the 7M-50.000MAHE-T but different internal design. This part is active status with full compliance ratings and may be selected based on supply availability or specific application requirements.

All substitute parts maintain the fundamental operating mode, ±30ppm frequency stability, -40°C to 85°C temperature range, and 4-SMD surface mount package configuration of the original part.

Frequently Asked Questions (FAQ)

Q: Can the 7M-50.000MAHI-T directly replace the 7B50000003 without circuit modification?

A: The 7M-50.000MAHI-T matches the critical frequency, stability, load capacitance, and temperature specifications. The ESR increase from 40 Ohms to 60 Ohms requires circuit design verification to confirm oscillator startup and frequency accuracy remain within specification. Physical footprint reduction (3.20mm x 2.50mm versus 5.00mm x 3.20mm) is compatible with standard SMD assembly processes.

Q: What is the difference between the 7M and 7V series crystals?

A: Both series operate at 50 MHz with ±30ppm stability and identical electrical specifications. The series designation indicates different internal design or manufacturing process. Selection between series is based on supply availability and application-specific requirements. Both are active product status with full compliance ratings.

Q: Why do substitute parts have different load capacitance values?

A: Load capacitance (12pF, 16pF, 18pF, 20pF) is selected based on the specific circuit's load capacitance requirement. The original 7B50000003 specifies 16pF. Substitutes with different load capacitance values require circuit design verification to ensure oscillator frequency accuracy and startup performance remain within specification.

Q: Is the FL5000063Z from Diodes Incorporated compatible with the TXC CORPORATION original part?

A: The FL5000063Z matches the 50 MHz frequency, ±30ppm stability, 40 Ohms ESR, and -40°C to 85°C temperature range. The 18pF load capacitance differs from the original 16pF specification. Cross-manufacturer substitution is electrically compatible with circuit design verification for load capacitance effects. The FL5000063Z is active product status with ROHS3 compliance.

Q: What is the impact of the smaller package size (3.20mm x 2.50mm) on PCB layout?

A: The substitute parts use a smaller 3.20mm x 2.50mm footprint compared to the original 5.00mm x 3.20mm. This reduction provides space optimization benefits and is compatible with standard SMD assembly equipment. PCB layout modifications may be required to accommodate the smaller footprint, but electrical performance is not affected.

Q: Are all substitute parts RoHS compliant?

A: All identified substitute parts are RoHS compliant. The TXC CORPORATION parts carry RoHS Compliant certification. The Diodes Incorporated FL5000063Z carries ROHS3 Compliant certification. Both certifications meet current regulatory requirements.

Q: What is the MSL rating for substitute parts?

A: All substitute parts maintain MSL 1 (Unlimited) rating, identical to the original 7B50000003. This rating indicates unlimited shelf life and no moisture sensitivity precautions are required during storage or handling.

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