ECS-.327-12.5-13 32.768 kHz Crystal Equivalent & Substitute Parts

Part Overview

The ECS-.327-12.5-13 is a 32.768 kHz tuning fork crystal in a cylindrical can, radial through-hole package. This component is classified as Not For New Designs, indicating it has been superseded. Finding equivalent or substitute parts is necessary for maintenance, repair, and legacy system support where the original part number is unavailable or inventory is depleted.

Key Parameters

Parameter	Value
Frequency	32.768 kHz
Frequency Tolerance	±20ppm
Load Capacitance	12.5pF
ESR (Equivalent Series Resistance)	35 kOhms
Operating Mode	Fundamental
Operating Temperature Range	-10°C ~ 60°C
Mounting Type	Through Hole
Package / Case	Cylindrical Can, Radial
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict parameter matching across electrical and mechanical specifications. The following criteria must align for functional equivalence:

Frequency: 32.768 kHz (exact match required)
Frequency Tolerance: ±20ppm (exact match required)
Load Capacitance: 12.5pF (exact match required)
Operating Mode: Fundamental (exact match required)
Operating Temperature Range: -10°C ~ 60°C (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Cylindrical Can, Radial (exact match required)
Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Substitute parts are classified into two categories:

Parametric Equivalents: All electrical and mechanical parameters match exactly. ESR may vary within acceptable operational limits.

Similar Parts: Meet all critical electrical parameters and package requirements but may have minor dimensional variations within the cylindrical can, radial package specification.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Frequency	Frequency Tolerance	Load Capacitance	ESR (kOhms)	Operating Temperature	Package	Product Status	RoHS Status
ECS-.327-12.5-13	ECS Inc.	32.768 kHz	±20ppm	12.5pF	35	-10°C ~ 60°C	Cylindrical Can, Radial	Not For New Designs	Request inventory verification
ECS-.327-12.5-13X	ECS Inc.	32.768 kHz	±20ppm	12.5pF	35	-10°C ~ 60°C	Cylindrical Can, Radial	Active	ROHS3 Compliant
G23270023	Diodes Incorporated	32.768 kHz	±20ppm	12.5pF	35	-10°C ~ 60°C	Cylindrical Can, Radial	Active	ROHS3 Compliant
VT200F-12.5PF20PPM	Seiko Instruments	32.768 kHz	±20ppm	12.5pF	50	-10°C ~ 60°C	Cylindrical Can, Radial	Active	ROHS3 Compliant
AB26T-32.768KHZ	Abracon LLC	32.768 kHz	±20ppm	12.5pF	35	-10°C ~ 60°C	Cylindrical Can, Radial	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: ECS-.327-12.5-13X

The ECS-.327-12.5-13X is the direct successor to the ECS-.327-12.5-13. It maintains identical electrical and mechanical specifications while offering Active product status and ROHS3 compliance. This part is the preferred choice for new procurement and legacy system replacement.

Secondary Recommendations: AB26T-32.768KHZ and G23270023

Both AB26T-32.768KHZ (Abracon LLC) and G23270023 (Diodes Incorporated) are parametric equivalents with Active product status and ROHS3 compliance. These parts match all critical electrical parameters and package specifications. Selection between these options may be based on supplier availability, lead time, or procurement agreements.

Alternative Option: VT200F-12.5PF20PPM

The VT200F-12.5PF20PPM (Seiko Instruments) meets all electrical and package requirements with one exception: ESR is specified at 50 kOhms versus 35 kOhms in the original part. This higher ESR may affect circuit performance in applications with tight impedance matching requirements. Use this part only when other substitutes are unavailable and circuit validation confirms acceptable operation.

Frequently Asked Questions (FAQ)

Q: Can I use VT200F-12.5PF20PPM as a direct replacement for ECS-.327-12.5-13?

A: VT200F-12.5PF20PPM meets all critical electrical parameters (frequency, tolerance, load capacitance, operating temperature) and package requirements. However, its ESR specification of 50 kOhms differs from the original 35 kOhms. Substitution is possible if circuit design accommodates the higher ESR value. Verify circuit performance before production deployment.

Q: What is the difference between parametric equivalents and similar parts?

A: Parametric equivalents match all electrical and mechanical specifications exactly. Similar parts meet all critical electrical parameters and package requirements but may have minor dimensional variations within the cylindrical can, radial package specification. Both categories are functionally compatible in the ECS-.327-12.5-13 application.

Q: Why is the original ECS-.327-12.5-13 marked as Not For New Designs?

A: This designation indicates the part has been superseded by newer versions. The ECS-.327-12.5-13X is the recommended replacement, offering improved compliance status and Active product availability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (ECS-.327-12.5-13X, G23270023, VT200F-12.5PF20PPM, and AB26T-32.768KHZ) are ROHS3 compliant. The original ECS-.327-12.5-13 requires inventory verification for RoHS status.

Q: Can I mix different substitute parts in the same assembly?

A: Yes. All substitute parts meet identical electrical specifications and package requirements. Mixing different manufacturers in the same assembly is acceptable from an electrical standpoint. Verify procurement and quality documentation for consistency.

Q: What is the significance of MSL 1 (Unlimited)?

A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All parts in this comparison share this specification, simplifying inventory management and logistics.

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