7M-12.000MBBK-T Equivalent & Substitute Parts

Part Overview

The 7M-12.000MBBK-T is a 12 MHz fundamental mode crystal oscillator manufactured by TXC CORPORATION. This surface mount device is specified for ±50ppm frequency stability with 20pF load capacitance and 100 Ohms equivalent series resistance. The component is packaged in 4-SMD, No Lead configuration with dimensions of 3.20mm x 2.50mm and maximum seated height of 0.80mm. The part maintains Active product status with RoHS Compliance and MSL Level 1 rating. Substitute parts are identified based on matching core electrical parameters and mechanical compatibility within the 12 MHz crystal oscillator category.

Key Parameters

Parameter	Value	Substitution Relevance
Frequency	12 MHz	Critical - must match exactly
Frequency Stability	±50ppm	Critical - determines tolerance class
Load Capacitance	20pF	Critical - circuit design parameter
ESR (Equivalent Series Resistance)	100 Ohms	Critical - oscillator startup and performance
Operating Mode	Fundamental	Critical - frequency generation method
Package / Case	4-SMD, No Lead	Critical - PCB footprint compatibility
Size / Dimension	3.20mm x 2.50mm	Critical - physical fit on PCB
Height - Seated (Max)	0.80mm	Important - clearance and assembly
Operating Temperature	-20°C ~ 70°C	Important - application environment
Mounting Type	Surface Mount	Critical - assembly method
MSL (Moisture Sensitivity Level)	1 (Unlimited)	Important - storage and handling
RoHS Status	RoHS Compliant	Important - regulatory compliance

Substitute Part Grouping Explanation

Substitute parts for the 7M-12.000MBBK-T are classified into three categories based on electrical and mechanical parameter alignment:

Upgrade Substitute (ECS-120-20-33-CKM-TR): This part matches all critical parameters of the main part with the exception of frequency stability, which is improved to ±10ppm. This represents an upgrade path for applications requiring tighter frequency tolerance. All mechanical, thermal, and compliance parameters remain compatible.

Similar Substitute (ECS-120-20-33-DU-TR): This part maintains matching frequency, load capacitance, ESR, and package specifications. However, it differs in frequency stability specification (±100ppm stability with ±50ppm tolerance) and extends the operating temperature range to -55°C ~ 125°C. This variant is suitable for applications with broader temperature requirements.

Parametric Equivalents (ECS-120-20-33-TR and ECS-120-20-33-TR3): Both parts provide direct electrical and mechanical equivalence to the main part. All critical parameters including 12 MHz frequency, ±50ppm stability, 20pF load capacitance, 100 Ohms ESR, 4-SMD No Lead package, and 3.20mm x 2.50mm dimensions are identical. These parts differ only in packaging tape configuration (TR versus TR3).

Substitution logic is based strictly on: frequency matching, load capacitance compatibility, ESR equivalence, package/case identity, physical dimensions, and operating mode alignment.

Parameter Comparison

Parameter	7M-12.000MBBK-T (Main)	ECS-120-20-33-CKM-TR (Upgrade)	ECS-120-20-33-DU-TR (Similar)	ECS-120-20-33-TR (Equivalent)	ECS-120-20-33-TR3 (Equivalent)
Manufacturer	TXC CORPORATION	ECS Inc.	ECS Inc.	ECS Inc.	ECS Inc.
Frequency	12 MHz	12 MHz	12 MHz	12 MHz	12 MHz
Frequency Stability	±50ppm	±10ppm	±100ppm	±50ppm	±50ppm
Frequency Tolerance	±50ppm	±10ppm	±50ppm	±50ppm	±50ppm
Load Capacitance	20pF	20pF	20pF	20pF	20pF
ESR	100 Ohms	100 Ohms	100 Ohms	100 Ohms	100 Ohms
Operating Mode	Fundamental	Fundamental	Fundamental	Fundamental	Fundamental
Package / Case	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead
Size / Dimension	3.20mm x 2.50mm	3.20mm x 2.50mm	3.20mm x 2.50mm	3.20mm x 2.50mm	3.20mm x 2.50mm
Height - Seated (Max)	0.80mm	0.80mm	0.80mm	0.80mm	0.80mm
Operating Temperature	-20°C ~ 70°C	-20°C ~ 70°C	-55°C ~ 125°C	-20°C ~ 70°C	-20°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Replacement: The ECS-120-20-33-TR and ECS-120-20-33-TR3 parts provide complete parametric equivalence to the 7M-12.000MBBK-T. Both maintain identical electrical specifications, mechanical dimensions, and operating temperature range. Selection between these two depends on tape configuration requirements for automated assembly. Both parts carry Active product status and ROHS3 compliance certification.

For Enhanced Frequency Stability: The ECS-120-20-33-CKM-TR upgrade substitute offers improved frequency stability at ±10ppm while maintaining all other critical parameters. This part is suitable for applications requiring tighter frequency tolerance than the original ±50ppm specification. All mechanical compatibility and compliance certifications remain unchanged.

For Extended Temperature Operation: The ECS-120-20-33-DU-TR similar substitute extends the operating temperature range to -55°C ~ 125°C while maintaining the original ±50ppm frequency tolerance. This variant is appropriate for applications operating outside the standard -20°C ~ 70°C range. Note that frequency stability specification differs at ±100ppm, though tolerance remains ±50ppm.

All substitute parts maintain RoHS compliance, MSL Level 1 rating, and Active product status. Selection should be based on specific application requirements for frequency stability, operating temperature, and tape configuration.

Frequently Asked Questions (FAQ)

Q: Can ECS-120-20-33-CKM-TR be used as a direct replacement for 7M-12.000MBBK-T?

A: The ECS-120-20-33-CKM-TR is mechanically and electrically compatible with the 7M-12.000MBBK-T for all critical parameters including frequency, load capacitance, ESR, package, and dimensions. The primary difference is improved frequency stability (±10ppm versus ±50ppm). This part functions as an upgrade substitute and is suitable for direct replacement in applications where the enhanced stability is acceptable or beneficial.

Q: What is the difference between ECS-120-20-33-TR and ECS-120-20-33-TR3?

A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The difference lies in packaging tape configuration. ECS-120-20-33-TR uses standard tape (TR), while ECS-120-20-33-TR3 uses alternative tape configuration (TR3). Selection depends on compatibility with your automated assembly equipment and tape feeder specifications.

Q: Is ECS-120-20-33-DU-TR suitable for my application if I need -20°C ~ 70°C operation?

A: The ECS-120-20-33-DU-TR operates across -55°C ~ 125°C, which encompasses the -20°C ~ 70°C range. However, this part specifies ±100ppm frequency stability with ±50ppm tolerance, compared to the original ±50ppm specification. Verify that your application can tolerate the broader stability specification before substitution.

Q: Are all substitute parts RoHS compliant?

A: Yes. The main part carries RoHS Compliance certification, while all substitute parts carry ROHS3 Compliance certification. Both certifications meet current regulatory requirements for lead-free and restricted substance compliance.

Q: Can I mix substitute parts from different manufacturers in the same production run?

A: All substitute parts maintain identical mechanical dimensions (3.20mm x 2.50mm), package configuration (4-SMD, No Lead), and electrical parameters (12 MHz, 20pF load capacitance, 100 Ohms ESR). Parts can be used interchangeably from a PCB assembly perspective. However, verify that your quality and traceability procedures permit mixed manufacturer sourcing.

Q: What does MSL Level 1 mean for storage and handling?

A: MSL Level 1 indicates Unlimited moisture sensitivity level. These components do not require special moisture control during storage or handling. Standard warehouse conditions are acceptable without desiccant packaging or controlled humidity environments.

Q: How do I determine which substitute part is best for my application?

A: Selection depends on three factors: (1) Frequency stability requirement—use ECS-120-20-33-CKM-TR if ±10ppm is needed; (2) Operating temperature range—use ECS-120-20-33-DU-TR if -55°C ~ 125°C is required; (3) Standard operation—use ECS-120-20-33-TR or ECS-120-20-33-TR3 for direct equivalence. All parts are mechanically compatible with the original PCB footprint.

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