FQ1200007 Equivalent & Substitute Parts

Part Overview

The FQ1200007 is a 12 MHz fundamental mode crystal oscillator manufactured by Diodes Incorporated under the SaRonix-eCera™ FQ series. This component is rated for surface mount assembly in a 4-SMD, No Lead package with 18pF load capacitance and 120 Ohms equivalent series resistance. The part is currently listed as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Frequency	12 MHz
Frequency Tolerance	±20ppm
Frequency Stability	±30ppm
Load Capacitance	18pF
ESR (Equivalent Series Resistance)	120 Ohms
Operating Mode	Fundamental
Operating Temperature Range	-40°C to 85°C
Package / Case	4-SMD, No Lead
Size / Dimension	0.126" L x 0.098" W (3.20mm x 2.50mm)
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution of the FQ1200007 is determined by strict equivalence across the following critical parameters:

Frequency: 12 MHz (exact match required)
Frequency Tolerance: ±20ppm (exact match required)
Load Capacitance: 18pF (exact match required)
Package / Case: 4-SMD, No Lead (exact match required)
Physical Dimensions: 0.126" L x 0.098" W (3.20mm x 2.50mm) (exact match required)
Operating Temperature Range: -40°C to 85°C (exact match required)
Mounting Type: Surface Mount (exact match required)

All identified substitute parts meet these criteria. Minor variations in ESR (100 Ohms vs. 120 Ohms) and height specifications (0.031" vs. 0.033") remain within acceptable tolerance ranges for crystal oscillator circuit design and do not preclude functional substitution.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Frequency	Frequency Tolerance	Load Capacitance	ESR (Ohms)	Package	Size (mm)	Height Max (mm)	Operating Temp	Product Status	RoHS Status
FQ1200007	Diodes Incorporated	SaRonix-eCera™ FQ	12 MHz	±20ppm	18pF	120	4-SMD, No Lead	3.20 x 2.50	0.85	-40 to 85°C	Obsolete	RoHS Compliant
830055295	Würth Elektronik	WE-XTAL	12 MHz	±20ppm	18pF	120	4-SMD, No Lead	3.20 x 2.50	0.80	-40 to 85°C	Active	ROHS3 Compliant
LFXTAL055295	IQD Frequency Products	CFPX-180	12 MHz	±20ppm	18pF	120	4-SMD, No Lead	3.20 x 2.50	0.80	-40 to 85°C	Active	ROHS3 Compliant
LFXTAL061070	IQD Frequency Products	CFPX-180	12 MHz	±20ppm	18pF	120	4-SMD, No Lead	3.20 x 2.50	0.80	-40 to 85°C	Active	ROHS3 Compliant
7M12020002	TXC CORPORATION	7M	12 MHz	±20ppm	18pF	Not Specified	4-SMD, No Lead	3.20 x 2.50	0.80	-40 to 85°C	Active	RoHS Compliant
ECS-120-18-33-JGN-TR	ECS Inc.	ECX-32	12 MHz	±20ppm	18pF	100	4-SMD, No Lead	3.20 x 2.50	0.80	-40 to 85°C	Active	ROHS3 Compliant
RH100-12.000-18-2030-EXT-TR	Raltron Electronics	RH100	12 MHz	±20ppm	18pF	100	4-SMD, No Lead	3.20 x 2.50	0.80	-40 to 85°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed above are functionally equivalent to the FQ1200007 based on electrical and mechanical parameters. Selection among these alternatives should be based on the following factors:

Product Status: The FQ1200007 is obsolete. All substitute parts are in active production status, ensuring long-term availability and supply chain continuity.

Compliance Certifications: All substitute parts maintain RoHS compliance. Parts designated ROHS3 Compliant (830055295, LFXTAL055295, LFXTAL061070, ECS-120-18-33-JGN-TR, RH100-12.000-18-2030-EXT-TR) represent current compliance standards. The 7M12020002 and FQ1200007 are RoHS Compliant under earlier standards.

ESR Variation: The FQ1200007 specifies 120 Ohms ESR. Substitute parts from ECS Inc. (ECS-120-18-33-JGN-TR) and Raltron Electronics (RH100-12.000-18-2030-EXT-TR) specify 100 Ohms ESR. This 20 Ohm reduction does not affect circuit compatibility for standard crystal oscillator applications. Parts from Würth Elektronik and IQD Frequency Products maintain 120 Ohms ESR matching the original specification.

Inventory Availability: ECS-120-18-33-JGN-TR offers the highest inventory level (27,859 pcs), followed by RH100-12.000-18-2030-EXT-TR (8,993 pcs) and 830055295 (5,646 pcs).

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with 100 Ohms ESR instead of 120 Ohms ESR?

A: Yes. The 20 Ohm difference in ESR between the FQ1200007 (120 Ohms) and parts such as ECS-120-18-33-JGN-TR or RH100-12.000-18-2030-EXT-TR (100 Ohms) is within acceptable tolerance for crystal oscillator circuit design. Both values support standard oscillator configurations without circuit modification.

Q: Are all substitute parts pin-compatible with the FQ1200007?

A: Yes. All substitute parts use the identical 4-SMD, No Lead package with matching physical dimensions (3.20mm x 2.50mm). PCB footprints and assembly processes remain unchanged.

Q: What is the difference between the two IQD Frequency Products part numbers (LFXTAL055295 and LFXTAL061070)?

A: Both parts are from the CFPX-180 series and share identical electrical and mechanical specifications. They are functionally equivalent alternatives. Selection between them may depend on supplier availability or internal inventory management.

Q: Does the height difference (0.85mm vs. 0.80mm) affect PCB assembly?

A: No. The 0.05mm height variation is negligible for surface mount assembly processes. Standard reflow soldering and component placement equipment accommodate this tolerance without adjustment.

Q: Are all substitute parts REACH compliant?

A: Yes. All substitute parts listed are REACH Unaffected, matching the compliance status of the FQ1200007.

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