7C-27.000MBB-T CMOS Oscillator Equivalent & Substitute Parts

Part Overview

The 7C-27.000MBB-T is a 27 MHz XO (Standard) CMOS oscillator manufactured by TXC CORPORATION, designed for applications requiring a crystal-based frequency reference with enable/disable functionality. This surface mount device operates at 3.3V supply voltage and is packaged in a 4-SMD, No Lead configuration with RoHS compliance and unlimited moisture sensitivity rating (MSL 1).

The part is currently in active production status with 913 pieces available in new original inventory. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and functional equivalence within the 27 MHz CMOS oscillator category.

Key Parameters

Parameter	Specification
Frequency	27 MHz
Output Type	CMOS
Supply Voltage	3.3V
Function	Enable/Disable
Frequency Stability	±50ppm
Operating Temperature Range	-10°C ~ 70°C
Maximum Supply Current	30mA
Package Type	4-SMD, No Lead
Physical Dimensions	5.00mm L x 3.20mm W
Maximum Seated Height	1.40mm
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitute parts for the 7C-27.000MBB-T are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Electrical Equivalence Criteria:

Frequency: 27 MHz (exact match required)
Output: CMOS (exact match required)
Supply Voltage: 3.3V (exact match required)
Function: Enable/Disable (exact match required)
Operating Temperature: -10°C ~ 70°C (exact match required)

Mechanical Compatibility Criteria:

Package Type: 4-SMD, No Lead (exact match required)
Physical Dimensions: 5.00mm L x 3.20mm W (exact match required)
Mounting Type: Surface Mount (exact match required)

Regulatory Compliance:

RoHS Compliance status verified
REACH Unaffected status confirmed
ECCN: EAR99 classification maintained

All substitute parts listed meet these criteria. Variations in frequency stability (±25ppm vs ±50ppm), maximum supply current (13mA to 30mA), seated height (1.15mm to 1.40mm), and packaging format (Tape & Reel vs Cut Tape vs Bulk) do not preclude substitution when the primary electrical and mechanical parameters are matched.

Parameter Comparison

Parameter	7C-27.000MBB-T (TXC)	7C-27.000MBA-T (TXC)	ECS-3250SS-270-3B (ECS Inc.)	SXO53C3A171-27.000M (Suntsu)
Manufacturer	TXC CORPORATION	TXC CORPORATION	ECS Inc.	Suntsu Electronics, Inc.
Series	7C	7C	ECS-3250SS	SXO53C
Frequency	27 MHz	27 MHz	27 MHz	27 MHz
Output Type	CMOS	CMOS	CMOS	CMOS
Supply Voltage	3.3V	3.3V	3.3V	3.3V
Function	Enable/Disable	Enable/Disable	Enable/Disable	Enable/Disable
Frequency Stability	±50ppm	±25ppm	±50ppm	±50ppm
Operating Temperature	-10°C ~ 70°C	-10°C ~ 70°C	-10°C ~ 70°C	-10°C ~ 70°C
Maximum Supply Current	30mA	30mA	13mA	16mA
Package Type	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead
Physical Dimensions	5.00mm x 3.20mm	5.00mm x 3.20mm	5.00mm x 3.20mm	5.00mm x 3.20mm
Maximum Seated Height	1.40mm	1.40mm	1.15mm	1.40mm
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	Not specified
Product Status	Active	Active	Active	Active
Packaging Format	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT)	Bulk
Current Inventory	913 Pcs	2131 Pcs	1599 Pcs	2346 Pcs

Engineering Selection Recommendations

Primary Substitute (Upgrade Path): The 7C-27.000MBA-T from TXC CORPORATION is the direct upgrade substitute for the 7C-27.000MBB-T. Both parts are from the same manufacturer and series (7C), with identical electrical and mechanical specifications. The 7C-27.000MBA-T offers improved frequency stability at ±25ppm compared to ±50ppm of the main part, while maintaining all other parameters. This part is recommended when higher frequency accuracy is required within the same product line. Inventory availability is higher at 2131 pieces.

Cross-Manufacturer Substitutes: The ECS-3250SS-270-3B (ECS Inc.) and SXO53C3A171-27.000M (Suntsu Electronics, Inc.) are direct functional equivalents meeting all critical electrical and mechanical parameters. Both parts maintain 27 MHz frequency, 3.3V supply, CMOS output, enable/disable function, and identical package dimensions.

The ECS-3250SS-270-3B features lower maximum supply current (13mA vs 30mA) and reduced seated height (1.15mm vs 1.40mm), offering potential benefits for power-constrained and space-limited applications. This part is supplied in Cut Tape format.

The SXO53C3A171-27.000M maintains identical maximum supply current and seated height specifications to the main part, with Bulk packaging available. This part provides a direct mechanical and electrical equivalent from an alternative manufacturer.

All substitute parts maintain active product status and RoHS compliance. Selection between substitutes should be based on packaging format requirements (Tape & Reel, Cut Tape, or Bulk), inventory availability, and application-specific current consumption constraints.

Frequently Asked Questions (FAQ)

Q: Can the 7C-27.000MBA-T replace the 7C-27.000MBB-T in existing designs?

A: Yes. The 7C-27.000MBA-T is a direct substitute with identical electrical and mechanical specifications. The improved frequency stability (±25ppm vs ±50ppm) is a performance enhancement that does not create compatibility issues. Both parts share the same package type, dimensions, supply voltage, frequency, and output characteristics.

Q: What is the difference between the TXC parts and the ECS/Suntsu alternatives?

A: All parts meet the same core electrical specifications (27 MHz, 3.3V, CMOS, enable/disable). Differences exist in maximum supply current (13mA to 30mA), seated height (1.15mm to 1.40mm), and manufacturer. The ECS part offers lower current consumption; the Suntsu part matches the original specifications more closely. Selection depends on application requirements and packaging format availability.

Q: Are there packaging format differences between substitutes?

A: Yes. The 7C-27.000MBB-T and 7C-27.000MBA-T are supplied in Tape & Reel format. The ECS-3250SS-270-3B is supplied in Cut Tape format. The SXO53C3A171-27.000M is supplied in Bulk format. Packaging format selection should align with assembly line requirements and component handling procedures.

Q: Do all substitute parts meet RoHS compliance?

A: Yes. The 7C-27.000MBB-T, 7C-27.000MBA-T, ECS-3250SS-270-3B, and SXO53C3A171-27.000M all carry RoHS compliance certification (RoHS Compliant or ROHS3 Compliant). All parts maintain MSL 1 (Unlimited) moisture sensitivity rating.

Q: Which substitute offers the best power efficiency?

A: The ECS-3250SS-270-3B offers the lowest maximum supply current specification at 13mA, compared to 30mA for the TXC parts and 16mA for the Suntsu part. This makes the ECS part suitable for power-constrained applications.

Q: Can substitutes be mixed in the same production batch?

A: All listed substitutes are electrically and mechanically equivalent for the 27 MHz CMOS oscillator function. However, mixing different manufacturers or packaging formats in a single production batch may require separate handling procedures and inventory management. Consult assembly and quality procedures for specific guidance.

Q: What is the frequency stability tolerance for each part?

A: The 7C-27.000MBB-T, ECS-3250SS-270-3B, and SXO53C3A171-27.000M specify ±50ppm frequency stability. The 7C-27.000MBA-T specifies ±25ppm, offering tighter tolerance. Selection should be based on application frequency accuracy requirements.

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