8Q-37.400MEEC-T Equivalent & Substitute Parts

Part Overview

The 8Q-37.400MEEC-T is a 37.4 MHz fundamental mode crystal oscillator manufactured by TXC CORPORATION in a 4-SMD, No Lead surface mount package. This component is designed for applications requiring precise frequency generation at 37.4 MHz with ±10ppm stability. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers. Substitute parts must maintain the same frequency, stability tolerance, operating temperature range, and fundamental operating mode to ensure direct compatibility in existing circuit designs.

Key Parameters

Parameter	Value
Frequency	37.4 MHz
Frequency Stability	±10ppm
Frequency Tolerance	±10ppm
Load Capacitance	9pF
ESR (Equivalent Series Resistance)	80 Ohms
Operating Mode	Fundamental
Operating Temperature Range	-20°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	4-SMD, No Lead
Size / Dimension	0.063" L x 0.047" W (1.60mm x 1.20mm)
Height - Seated (Max)	0.016" (0.40mm)
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 8Q-37.400MEEC-T is determined by the following critical parameters:

Primary Matching Criteria:

Frequency: 37.4 MHz (exact match required)
Frequency Stability: ±10ppm (exact match required)
Operating Mode: Fundamental (exact match required)
Operating Temperature Range: -20°C ~ 70°C (exact match required)
Package / Case: 4-SMD, No Lead (exact match required)
Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Parameters:

Load Capacitance: 9pF (primary specification; 8pF and 7pF variants acceptable with circuit verification)
ESR: 80 Ohms (primary specification; 50 Ohms variants acceptable with circuit verification)
Physical Dimensions: 0.063" L x 0.047" W (1.60mm x 1.20mm) for direct footprint compatibility; smaller packages acceptable if PCB layout permits

Compliance Parameters:

RoHS Status: RoHS Compliant or ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited) or Not Applicable

Substitute parts are grouped into two categories based on physical dimensions: full-size equivalents (1.60mm x 1.20mm) and compact alternatives (1.20mm x 1.00mm).

Parameter Comparison

Part Number	Manufacturer	Frequency	Frequency Stability	Load Capacitance	ESR (Ohms)	Operating Temperature	Package	Size (mm)	Height (mm)	Product Status	RoHS Status
8Q-37.400MEEC-T	TXC CORPORATION	37.4 MHz	±10ppm	9pF	80	-20°C ~ 70°C	4-SMD, No Lead	1.60 x 1.20	0.40	Discontinued	RoHS Compliant
8Q-37.400MEEV-T	FTS	37.4 MHz	±10ppm	8pF	80	-20°C ~ 70°C	4-SMD, No Lead	1.60 x 1.20	0.40	Active	RoHS Compliant
ABM12W-37.4000MHZ-7-B1U-T3	Abracon LLC	37.4 MHz	±10ppm	7pF	50	-20°C ~ 70°C	4-SMD, No Lead	1.60 x 1.20	0.40	Active	ROHS3 Compliant
ABM12W-37.4000MHZ-8-B1U-T3	Abracon LLC	37.4 MHz	±10ppm	8pF	50	-20°C ~ 70°C	4-SMD, No Lead	1.60 x 1.20	0.40	Active	ROHS3 Compliant
ABM13W-37.4000MHZ-7-B1U-T5	Abracon LLC	37.4 MHz	±10ppm	7pF	50	-20°C ~ 70°C	4-SMD, No Lead	1.20 x 1.00	0.33	Active	ROHS3 Compliant
ABM13W-37.4000MHZ-8-B1U-T5	Abracon LLC	37.4 MHz	±10ppm	8pF	50	-20°C ~ 70°C	4-SMD, No Lead	1.20 x 1.00	0.33	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Full Compatibility):

The 8Q-37.400MEEV-T from FTS is the closest functional equivalent to the 8Q-37.400MEEC-T. Both parts share identical frequency, stability, operating temperature range, package type, and physical dimensions. The only parameter difference is load capacitance (8pF versus 9pF), which represents a 1pF variance. This part is currently active in inventory and maintains RoHS compliance.

Alternative Substitutes (Abracon LLC ABM12W Series):

The ABM12W-37.4000MHZ-7-B1U-T3 and ABM12W-37.4000MHZ-8-B1U-T3 maintain identical physical dimensions (1.60mm x 1.20mm) and package configuration to the original part. These parts differ in ESR specification (50 Ohms versus 80 Ohms) and load capacitance (7pF or 8pF versus 9pF). Both are ROHS3 compliant and currently active. The lower ESR value may provide improved performance characteristics in certain circuit topologies.

Compact Alternative (Abracon LLC ABM13W Series):

The ABM13W-37.4000MHZ-7-B1U-T5 and ABM13W-37.4000MHZ-8-B1U-T5 offer the same electrical specifications as the ABM12W series but in a smaller physical footprint (1.20mm x 1.00mm with 0.33mm height). These parts are suitable for applications where PCB space constraints permit footprint reduction. Existing PCB designs using the original 1.60mm x 1.20mm footprint require layout modification to accommodate these compact packages.

Product Status Consideration:

All identified substitute parts maintain active product status with current inventory availability, eliminating supply chain risk associated with the discontinued 8Q-37.400MEEC-T.

Frequently Asked Questions (FAQ)

Q: Can the 8Q-37.400MEEV-T directly replace the 8Q-37.400MEEC-T without circuit modification?

A: The 8Q-37.400MEEV-T is functionally equivalent with matching frequency, stability, operating temperature, package, and physical dimensions. The 1pF load capacitance difference (8pF versus 9pF) falls within typical circuit tolerance margins for crystal oscillator applications. Direct substitution is supported without circuit modification.

Q: What is the significance of the ESR difference between the original part (80 Ohms) and Abracon alternatives (50 Ohms)?

A: ESR (Equivalent Series Resistance) affects crystal oscillator startup characteristics and power consumption. The lower ESR value (50 Ohms) in Abracon parts may result in faster startup and reduced power draw. Circuit designs accommodating the original 80 Ohms specification operate within acceptable parameters with 50 Ohms components, though oscillator gain margin should be verified for marginal designs.

Q: Are the ABM13W compact series parts compatible with existing PCB layouts designed for the 8Q-37.400MEEC-T?

A: The ABM13W series uses a smaller footprint (1.20mm x 1.00mm versus 1.60mm x 1.20mm). Direct PCB footprint compatibility is not maintained. These parts require PCB layout modification and are suitable only for new designs or redesigned assemblies where space reduction is beneficial.

Q: Do all substitute parts meet the same environmental and compliance standards as the original?

A: All identified substitutes maintain RoHS compliance (either RoHS or ROHS3 status). The original part specifies MSL 1 (Unlimited), while Abracon parts specify MSL as Not Applicable. Both classifications indicate minimal moisture sensitivity and are compatible with standard PCB assembly processes.

Q: What load capacitance value should be selected when choosing between 7pF, 8pF, and 9pF variants?

A: Load capacitance selection depends on the specific oscillator circuit design. The original specification calls for 9pF. The 8Q-37.400MEEV-T (8pF) provides the closest match. Abracon alternatives offer 7pF or 8pF options. Circuit design documentation should specify the required load capacitance; substitution with different values requires oscillator frequency calibration verification.

Q: Is the 8Q-37.400MEEV-T from FTS the recommended first choice for replacement?

A: The 8Q-37.400MEEV-T is the most direct equivalent based on matching all critical parameters except load capacitance (1pF difference). This part is recommended as the primary substitution option. Abracon alternatives are suitable when specific performance characteristics (lower ESR, compact size) align with application requirements.

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