LFXTAL036274 Equivalent & Substitute Parts Reference

Part Overview

The LFXTAL036274 is an 8 MHz fundamental mode crystal oscillator manufactured by IQD Frequency Products, designed for surface mount applications in HC-49/US package configuration. This active product operates across the -20°C to 70°C temperature range with ±20ppm frequency tolerance and 18pF load capacitance. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same frequency, tolerance, load capacitance, and package standards, enabling design flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Frequency	8.0000	MHz	Critical - Must match exactly
Frequency Tolerance	±20	ppm	Critical - Determines circuit accuracy
Frequency Stability	±50	ppm	Critical - Temperature performance specification
Load Capacitance	18	pF	Critical - Circuit matching requirement
ESR (Equivalent Series Resistance)	40	Ohms	Important - Affects circuit startup and stability
Operating Mode	Fundamental	-	Critical - Determines frequency generation method
Package / Case	HC-49/US	-	Critical - Physical and electrical interface
Mounting Type	Surface Mount	-	Critical - PCB assembly compatibility
Operating Temperature	-20 to 70	°C	Important - Application environment specification

Substitute Part Grouping Explanation

Substitution eligibility for the LFXTAL036274 is determined by strict equivalence across the following parameters:

Critical Matching Parameters:

Frequency: 8.0000 MHz (exact match required)
Frequency Tolerance: ±20ppm (exact match required)
Frequency Stability: ±50ppm (exact match required)
Load Capacitance: 18pF (exact match required)
Operating Mode: Fundamental (exact match required)
Package / Case: HC-49/US (exact match required)
Operating Temperature Range: -20°C to 70°C (exact match required)

Allowable Variation Parameters:

ESR (Equivalent Series Resistance): Variation permitted within circuit design margins
Mounting Type: Surface Mount variants acceptable
Packaging Format: Tape & Reel, Cut Tape, or Bulk acceptable
Manufacturer: Different manufacturers acceptable if all electrical and mechanical specifications match

The three substitute parts listed (ABLS-8.000MHZ-B2-T, ABL-8.000MHZ-B2-T, ECS-80-18-5PX-JEM-TR) meet all critical matching parameters. ESR variations (40 Ohms main part versus 80 Ohms or 60 Ohms in substitutes) are within acceptable engineering tolerances for HC-49/US crystal applications.

Parameter Comparison

Parameter	LFXTAL036274 (IQD)	ABLS-8.000MHZ-B2-T (Abracon)	ABL-8.000MHZ-B2-T (Abracon)	ECS-80-18-5PX-JEM-TR (ECS)
Frequency	8.0000 MHz	8.0000 MHz	8.0000 MHz	8.0000 MHz
Frequency Tolerance	±20ppm	±20ppm	±20ppm	±20ppm
Frequency Stability	±50ppm	±50ppm	±50ppm	±50ppm
Load Capacitance	18pF	18pF	18pF	18pF
ESR	40 Ohms	80 Ohms	80 Ohms	60 Ohms
Operating Mode	Fundamental	Fundamental	Fundamental	Fundamental
Package / Case	HC-49/US	HC-49/US	HC-49/US	HC-49/US
Mounting Type	Surface Mount	Surface Mount	Through Hole	Surface Mount
Operating Temperature	-20°C to 70°C	-20°C to 70°C	-20°C to 70°C	-20°C to 70°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Affected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

ABLS-8.000MHZ-B2-T (Abracon LLC) - Surface Mount Primary Substitute

This part maintains surface mount compatibility with the LFXTAL036274 and matches all critical electrical parameters. ESR specification of 80 Ohms represents a 100% increase from the main part but remains within acceptable operating margins for HC-49/US crystal circuits. REACH Affected status requires compliance verification in regulated applications. Available in Cut Tape and Digi-Reel packaging formats with 2400 units in stock.

ECS-80-18-5PX-JEM-TR (ECS Inc.) - Surface Mount Alternative

This part provides surface mount operation with ESR of 60 Ohms, representing a 50% increase from the main part specification. All critical electrical and mechanical parameters match the LFXTAL036274. REACH Unaffected status and ROHS3 compliance align with the main part. Moisture Sensitivity Level 1 (Unlimited) is specified. Available in Tape & Reel packaging with 805 units in stock.

ABL-8.000MHZ-B2-T (Abracon LLC) - Through Hole Alternative

This part is electrically equivalent but features through-hole mounting, requiring PCB design modification. ESR specification of 80 Ohms matches the ABLS variant. REACH Unaffected status and ROHS3 compliance are maintained. Suitable only for applications where through-hole assembly is specified. Available in Bulk packaging with 5549 units in stock.

Compliance Considerations

All substitute parts maintain ROHS3 compliance and EAR99 export classification. The ABLS-8.000MHZ-B2-T carries REACH Affected status, requiring additional documentation in restricted substance applications. The main part LFXTAL036274 and ECS-80-18-5PX-JEM-TR maintain REACH Unaffected status.

Frequently Asked Questions (FAQ)

Q: Can ABLS-8.000MHZ-B2-T replace LFXTAL036274 in a surface mount application?

A: Yes. Both parts are surface mount HC-49/US crystals with identical frequency (8.0000 MHz), tolerance (±20ppm), stability (±50ppm), and load capacitance (18pF). ESR differs (80 Ohms versus 40 Ohms), but this variation is within acceptable circuit design margins for this package type. Verify REACH compliance requirements for your application, as ABLS-8.000MHZ-B2-T carries REACH Affected status.

Q: What is the difference between ABLS-8.000MHZ-B2-T and ABL-8.000MHZ-B2-T?

A: The primary difference is mounting type. ABLS-8.000MHZ-B2-T is surface mount; ABL-8.000MHZ-B2-T is through-hole. Both share identical electrical specifications (8 MHz, ±20ppm tolerance, 18pF load capacitance, 80 Ohms ESR). ABL-8.000MHZ-B2-T requires PCB redesign for through-hole assembly and is not a direct substitute for surface mount applications.

Q: Why does ECS-80-18-5PX-JEM-TR have different ESR than the main part?

A: ESR variation is a manufacturing characteristic that differs between crystal manufacturers while maintaining functional equivalence. The ECS part specifies 60 Ohms ESR compared to 40 Ohms for LFXTAL036274. Both values are acceptable for HC-49/US fundamental mode crystals operating at 8 MHz with 18pF load capacitance. Circuit design margins accommodate this variation.

Q: Are all substitute parts available in the same packaging format?

A: No. LFXTAL036274 is supplied in Tape & Reel format. ABLS-8.000MHZ-B2-T is available in Cut Tape and Digi-Reel formats. ECS-80-18-5PX-JEM-TR is supplied in Tape & Reel. ABL-8.000MHZ-B2-T is available in Bulk. Verify packaging compatibility with your assembly process requirements.

Q: What does REACH Affected status mean for ABLS-8.000MHZ-B2-T?

A: REACH Affected indicates the part may contain substances subject to REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) regulations. Applications in European markets or with restricted substance requirements should prioritize REACH Unaffected alternatives: LFXTAL036274, ABL-8.000MHZ-B2-T, or ECS-80-18-5PX-JEM-TR.

Q: Can these crystals be used interchangeably in production?

A: Yes, provided mounting type compatibility is maintained. For surface mount applications, LFXTAL036274, ABLS-8.000MHZ-B2-T, and ECS-80-18-5PX-JEM-TR are electrically and mechanically interchangeable. All maintain identical frequency, tolerance, stability, load capacitance, and operating temperature specifications. ESR variations do not affect functional interchangeability in standard HC-49/US circuit applications.

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