ECS-374-12-37B-CKY-TR Equivalent & Substitute Parts

Part Overview

The ECS-374-12-37B-CKY-TR is a 37.4 MHz fundamental mode quartz crystal manufactured by ECS Inc., designed for surface mount applications in compact form factors. This component operates at ±10ppm frequency stability with a 12pF load capacitance and 50 Ohms equivalent series resistance. The part is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across manufacturers, ensuring direct interchangeability in circuit designs without performance degradation or layout modifications.

Key Parameters

Parameter	Value	Unit
Frequency	37.4	MHz
Frequency Stability	±10	ppm
Load Capacitance	12	pF
ESR (Equivalent Series Resistance)	50	Ohms
Operating Mode	Fundamental	—
Operating Temperature Range	-30 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	4-SMD, No Lead	—
Size / Dimension	2.00 x 1.60	mm
Height - Seated (Max)	0.50	mm
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-374-12-37B-CKY-TR is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

Frequency: 37.4 MHz (exact match required)
Frequency Stability: ±10ppm (exact match required)
Load Capacitance: 12pF (exact match required)
ESR: 50 Ohms (exact match required)
Operating Mode: Fundamental (exact match required)

Mechanical Parameters:

Package / Case: 4-SMD, No Lead (exact match required)
Size / Dimension: 2.00mm x 1.60mm (exact match required)
Height - Seated (Max): 0.50mm (exact match required)
Mounting Type: Surface Mount (exact match required)

Environmental & Compliance Parameters:

Operating Temperature Range: -30°C to 85°C (exact match required)
RoHS Status: ROHS3 Compliant (minimum requirement)
Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Parts meeting all these criteria are classified as parametric equivalents and direct substitutes.

Parameter Comparison

Parameter	ECS-374-12-37B-CKY-TR (ECS Inc.)	QT216S-37.400METE-T (QST)	Match Status
Frequency	37.4 MHz	37.4 MHz	Equivalent
Frequency Stability	±10ppm	±10ppm	Equivalent
Frequency Tolerance	±10ppm	±10ppm	Equivalent
Load Capacitance	12pF	12pF	Equivalent
ESR (Equivalent Series Resistance)	50 Ohms	50 Ohms	Equivalent
Operating Mode	Fundamental	Fundamental	Equivalent
Operating Temperature Range	-30°C to 85°C	-30°C to 85°C	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	4-SMD, No Lead	4-SMD, No Lead	Equivalent
Size / Dimension	2.00mm x 1.60mm	2.00mm x 1.60mm	Equivalent
Height - Seated (Max)	0.50mm	0.50mm	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent
Product Status	Active	Active	Equivalent
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Equivalent

Engineering Selection Recommendations

The QT216S-37.400METE-T manufactured by QST qualifies as a direct parametric equivalent to the ECS-374-12-37B-CKY-TR. Both components maintain identical electrical specifications, mechanical dimensions, and environmental operating parameters.

Selection Basis:

Both parts are classified as Active product status, indicating current manufacturing availability and ongoing support. Both achieve ROHS3 compliance and carry MSL 1 (Unlimited) moisture sensitivity ratings, confirming equivalent environmental handling and regulatory standing.

The 37.4 MHz frequency, ±10ppm stability, 12pF load capacitance, and 50 Ohm ESR are maintained across both manufacturers. The 4-SMD, No Lead package with 2.00mm x 1.60mm footprint and 0.50mm maximum seated height ensures identical PCB layout compatibility and assembly process requirements.

Current inventory status shows 1138 pieces of the ECS part and 995 pieces of the QST substitute available, supporting procurement flexibility across both sources.

Frequently Asked Questions (FAQ)

Q: Can the QT216S-37.400METE-T replace the ECS-374-12-37B-CKY-TR in existing designs?

A: Yes. Both parts maintain identical electrical parameters (37.4 MHz, ±10ppm stability, 12pF load capacitance, 50 Ohm ESR), mechanical dimensions (2.00mm x 1.60mm, 0.50mm height), and operating temperature range (-30°C to 85°C). No circuit modifications or PCB layout changes are required.

Q: Are there differences in packaging or handling between these two parts?

A: Both parts are supplied in Tape & Reel (TR) packaging and carry MSL 1 (Unlimited) moisture sensitivity ratings. Handling, storage, and assembly procedures are equivalent.

Q: What determines whether a crystal can substitute for the ECS-374-12-37B-CKY-TR?

A: Substitution requires exact equivalence across frequency (37.4 MHz), frequency stability (±10ppm), load capacitance (12pF), ESR (50 Ohms), operating mode (Fundamental), package type (4-SMD, No Lead), physical dimensions (2.00mm x 1.60mm x 0.50mm max height), and operating temperature range (-30°C to 85°C).

Q: Do both parts meet the same compliance standards?

A: Yes. Both the ECS-374-12-37B-CKY-TR and QT216S-37.400METE-T are ROHS3 compliant. The ECS part carries REACH Unaffected status and EAR99 ECCN classification.

Q: What is the significance of the 12pF load capacitance specification?

A: Load capacitance determines the crystal's operating frequency in the circuit. Both parts specify 12pF, ensuring identical frequency response when used with equivalent circuit designs and matching load networks.

Q: Can these parts be used interchangeably in high-precision timing applications?

A: Both parts maintain ±10ppm frequency stability across the -30°C to 85°C operating range. Interchangeability is supported for applications within this stability specification.

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