F61200046 12 MHz Crystal Equivalent & Substitute Parts

Part Overview

The F61200046 is a 12 MHz fundamental mode crystal manufactured by Diodes Incorporated in the SaRonix-eCera™ F6 series. This component is rated for surface mount applications with 18pF load capacitance and 60 Ohms equivalent series resistance (ESR). The part is currently obsolete, necessitating identification of functionally equivalent alternatives from active manufacturers. Substitute parts must maintain the same frequency, frequency tolerance, operating temperature range, and fundamental operating mode while accommodating variations in load capacitance and ESR within acceptable circuit design parameters.

Key Parameters

Parameter	Value
Frequency	12 MHz
Frequency Tolerance	±20ppm
Frequency Stability	±30ppm
Load Capacitance	18pF
ESR (Equivalent Series Resistance)	60 Ohms
Operating Mode	Fundamental
Operating Temperature Range	-40°C to 85°C
Mounting Type	Surface Mount
Package / Case	2-SMD, No Lead
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the F61200046 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters (Must Match):

Frequency: 12 MHz
Frequency Tolerance: ±20ppm
Operating Mode: Fundamental
Operating Temperature Range: -40°C to 85°C
Mounting Type: Surface Mount
Package / Case: 2-SMD, No Lead

Allowable Variation Parameters:

Load Capacitance: 13pF to 20pF (circuit design must accommodate)
ESR: 6 Ohms to 80 Ohms (circuit impedance matching required)
Physical dimensions: Minor variations acceptable within SMD footprint compatibility
Height: Up to 1.35mm maximum seated height

All identified substitute parts meet the critical parameters. Variations in load capacitance and ESR require circuit-level evaluation to ensure proper oscillation characteristics and frequency accuracy within the specified tolerance band.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Frequency	Load Capacitance	ESR (Ohms)	Product Status	Size (mm)	Height Max (mm)	RoHS Status
F61200046	Diodes Incorporated	12 MHz	18pF	60	Obsolete	6.00 x 4.60	1.35	RoHS Compliant
445I23B12M00000	CTS-Frequency Controls	12 MHz	13pF	50	Active	5.00 x 3.20	1.35	ROHS3 Compliant
445I23C12M00000	CTS-Frequency Controls	12 MHz	16pF	50	Active	5.00 x 3.20	1.35	ROHS3 Compliant
445I23D12M00000	CTS-Frequency Controls	12 MHz	18pF	50	Active	5.00 x 3.20	1.35	ROHS3 Compliant
445I23E12M00000	CTS-Frequency Controls	12 MHz	20pF	50	Active	5.00 x 3.20	1.35	ROHS3 Compliant
ABM3-12.000MHZ-D2Y-T	Abracon LLC	12 MHz	18pF	60	Active	5.00 x 3.20	1.30	ROHS3 Compliant
ECS-120-18-23A-JGN-TR	ECS Inc.	12 MHz	18pF	80	Active	6.00 x 4.60	1.10	ROHS3 Compliant
H130A-12.000-18-2030-EXT-TR	Raltron Electronics	12 MHz	18pF	35	Active	5.00 x 3.20	1.10	ROHS3 Compliant
ILCX03A-HF5F18-12.000MHZ	ILSI	12 MHz	18pF	6	Active	5.00 x 3.20	1.35	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Characteristics): The ABM3-12.000MHZ-D2Y-T from Abracon LLC provides the closest electrical match to the F61200046, with identical 18pF load capacitance and 60 Ohms ESR. This part is active, ROHS3 compliant, and requires no circuit modification.

Load Capacitance Matched Alternatives: The 445I23D12M00000 from CTS-Frequency Controls matches the 18pF load capacitance specification with lower ESR (50 Ohms). This part is active with high inventory availability (34,162 units) and ROHS3 compliance. The ECS-120-18-23A-JGN-TR from ECS Inc. also maintains 18pF load capacitance but with higher ESR (80 Ohms) and identical physical dimensions to the original part.

Variable Load Capacitance Options: The CTS-Frequency Controls 445 series offers load capacitance variants (13pF, 16pF, 20pF) with consistent 50 Ohms ESR. Selection depends on circuit design requirements and load capacitance tolerance specifications. The H130A-12.000-18-2030-EXT-TR from Raltron Electronics provides the lowest ESR option (35 Ohms) with 18pF load capacitance, suitable for applications requiring minimal series resistance.

Compliance Considerations: All substitute parts are ROHS3 compliant. The original F61200046 is RoHS compliant (ROHS1). The ILCX03A-HF5F18-12.000MHZ from ILSI offers the lowest ESR (6 Ohms) among all alternatives, providing maximum flexibility for impedance-sensitive circuit designs.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with different load capacitance than the original F61200046?

A: Yes, provided the circuit design accommodates the variation. The original part specifies 18pF load capacitance. Substitute parts with 13pF, 16pF, or 20pF load capacitance are electrically equivalent if the oscillator circuit is designed to operate at the specified frequency with the alternative load capacitance value. Circuit simulation or testing is necessary to confirm frequency accuracy remains within the ±20ppm tolerance specification.

Q: What is the significance of ESR differences among substitute parts?

A: ESR (Equivalent Series Resistance) affects oscillator startup characteristics and power consumption. The original F61200046 specifies 60 Ohms ESR. Substitute parts range from 6 Ohms to 80 Ohms. Lower ESR values (6 to 35 Ohms) reduce power consumption and improve startup margin. Higher ESR values (50 to 80 Ohms) may require circuit adjustment to maintain reliable oscillation. Circuit impedance matching and drive level specifications must be verified.

Q: Are all substitute parts pin-compatible with the F61200046?

A: All substitute parts use the 2-SMD, No Lead package format and are mechanically compatible with standard SMD footprints. However, physical dimensions vary slightly. The original F61200046 measures 6.00mm x 4.60mm, while most CTS and other alternatives measure 5.00mm x 3.20mm. Verify PCB footprint compatibility before assembly. The ECS-120-18-23A-JGN-TR maintains the original 6.00mm x 4.60mm dimensions.

Q: Which substitute part offers the best long-term availability?

A: The 445I23D12M00000 from CTS-Frequency Controls is recommended for long-term availability, with 34,162 units in current inventory and active product status. This part matches the original 18pF load capacitance specification with lower ESR (50 Ohms) and ROHS3 compliance.

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

A: All substitute parts meet the same electrical specifications (12 MHz, ±20ppm tolerance, fundamental mode, -40°C to 85°C operating range). However, ESR and load capacitance variations require consistent circuit design parameters. If mixing parts, ensure the oscillator circuit design accommodates the range of ESR and load capacitance values present in the substitute parts selected.

Q: What is the difference between RoHS and ROHS3 compliance?

A: RoHS (Restriction of Hazardous Substances) compliance restricts specific hazardous materials. The original F61200046 is RoHS compliant (ROHS1). All substitute parts are ROHS3 compliant, which represents a more recent regulatory standard. ROHS3 compliance is backward compatible and acceptable for applications requiring RoHS compliance.

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