CS10-27.000MABJ-UT 27 MHz Crystal Equivalent & Substitute Parts

Part Overview

The CS10-27.000MABJ-UT is a 27 MHz fundamental mode crystal manufactured by Citizen Finedevice Co Ltd, designed for surface mount applications with 18pF load capacitance and 50 Ohms equivalent series resistance. This component is classified as obsolete, making identification of equivalent substitute parts essential for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across frequency, load capacitance, ESR, and operating temperature parameters while accommodating mechanical and packaging differences.

Key Parameters

Parameter	Value	Unit
Frequency	27.0000	MHz
Frequency Tolerance	±30	ppm
Load Capacitance	18	pF
ESR (Equivalent Series Resistance)	50	Ohms
Operating Mode	Fundamental	—
Package / Case	2-SMD, No Lead	—
Size / Dimension	6.00 x 4.60	mm
Operating Temperature Range	-10 to 60	°C
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution eligibility for the CS10-27.000MABJ-UT is determined by strict alignment of the following electrical and mechanical parameters:

Critical Parameters (Must Match):

Frequency: 27.0000 MHz
Load Capacitance: 18 pF
Package / Case: 2-SMD, No Lead
Size / Dimension: 6.00 x 4.60 mm
Operating Mode: Fundamental
Mounting Type: Surface Mount

Allowable Variation Parameters:

Frequency Tolerance: ±30 ppm or tighter (±20 ppm acceptable)
Frequency Stability: ±50 ppm or tighter (±30 ppm acceptable)
ESR: 50 Ohms or lower (30 Ohms acceptable)
Operating Temperature Range: Must encompass or exceed -10°C to 60°C
Height - Seated (Max): Mechanical variation acceptable within PCB assembly constraints

Both identified substitute parts meet these criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Parameter	CS10-27.000MABJ-UT (Main)	ABM7-27.000MHZ-D2Y-T	ECS-270-18-23A-EN-TR
Manufacturer	Citizen Finedevice Co Ltd	Abracon LLC	ECS Inc.
Frequency	27.0000 MHz	27.0000 MHz	27.0000 MHz
Frequency Tolerance	±30 ppm	±20 ppm	±30 ppm
Frequency Stability	±50 ppm	±30 ppm	±50 ppm
Load Capacitance	18 pF	18 pF	18 pF
ESR	50 Ohms	50 Ohms	30 Ohms
Operating Temperature Range	-10 to 60°C	-40 to 85°C	-40 to 85°C
Package / Case	2-SMD, No Lead	2-SMD, No Lead	2-SMD, No Lead
Size / Dimension	6.00 x 4.60 mm	6.00 x 4.60 mm	6.00 x 4.60 mm
Height - Seated (Max)	1.00 mm	1.40 mm	1.10 mm
Product Status	Obsolete	Active	Active
Packaging	Bulk	Tape & Reel (TR)	Tape & Reel (TR)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Affected	REACH Unaffected

Engineering Selection Recommendations

ABM7-27.000MHZ-D2Y-T (Abracon LLC): This substitute provides improved frequency stability (±30 ppm vs. ±50 ppm) and tighter frequency tolerance (±20 ppm vs. ±30 ppm), resulting in superior frequency accuracy. Operating temperature range extends to -40°C to 85°C, exceeding the original specification. The part is ROHS3 compliant and actively manufactured. Height increase to 1.40 mm requires verification against PCB assembly clearance constraints. REACH Affected status applies.

ECS-270-18-23A-EN-TR (ECS Inc.): This substitute maintains identical frequency tolerance (±30 ppm) and frequency stability (±50 ppm) to the original part. ESR is reduced to 30 Ohms, providing lower impedance characteristics. Operating temperature range extends to -40°C to 85°C. The part is ROHS3 compliant, actively manufactured, and REACH Unaffected. Height of 1.10 mm presents minimal mechanical deviation from the original 1.00 mm specification.

Both substitutes are suitable for applications requiring 27 MHz fundamental mode crystals with 18 pF load capacitance in 2-SMD packages. Selection between them depends on specific requirements for frequency accuracy, ESR characteristics, regulatory compliance status, and PCB assembly height constraints.

Frequently Asked Questions (FAQ)

Q: Can ABM7-27.000MHZ-D2Y-T and ECS-270-18-23A-EN-TR be used interchangeably with CS10-27.000MABJ-UT?

A: Both parts are electrically compatible substitutes. They maintain the same frequency (27.0000 MHz), load capacitance (18 pF), package type (2-SMD, No Lead), and physical dimensions (6.00 x 4.60 mm). Mechanical height differences (1.40 mm and 1.10 mm respectively, versus 1.00 mm original) must be evaluated against PCB assembly clearance requirements.

Q: What are the key differences between the two substitute parts?

A: ABM7-27.000MHZ-D2Y-T offers superior frequency stability (±30 ppm) and tighter tolerance (±20 ppm) but has greater height (1.40 mm). ECS-270-18-23A-EN-TR maintains original tolerance and stability specifications, features lower ESR (30 Ohms vs. 50 Ohms), and has minimal height increase (1.10 mm). Both extend operating temperature range to -40°C to 85°C.

Q: Are there packaging considerations when substituting these parts?

A: The original CS10-27.000MABJ-UT is supplied in bulk packaging. Both substitutes are supplied in Tape & Reel (TR) format, which is standard for production environments. This change does not affect electrical performance but may impact procurement and handling procedures.

Q: What is the significance of REACH and RoHS compliance differences?

A: ECS-270-18-23A-EN-TR maintains REACH Unaffected status matching the original part. ABM7-27.000MHZ-D2Y-T is REACH Affected. Both are ROHS3 compliant. Regulatory compliance selection depends on end-use application and regional requirements.

Q: Can the height difference affect circuit performance?

A: Height differences (1.00 mm original, 1.10 mm or 1.40 mm substitutes) are mechanical considerations only and do not affect electrical performance. PCB assembly clearance and component placement constraints must be evaluated during design integration.

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