LFXTAL033158 Equivalent & Substitute Parts Reference

Part Overview

The LFXTAL033158 is a 3.6864 MHz surface mount crystal oscillator manufactured by IQD Frequency Products. This component operates in fundamental mode with an 18pF load capacitance and 300 Ohms equivalent series resistance (ESR), housed in an HC-49/US package. The part is Active status and RoHS3 compliant, making it suitable for applications requiring precise frequency control in telecommunications, industrial, and consumer electronics.

Substitute parts are necessary when the primary manufacturer has extended lead times, inventory constraints, or when design flexibility permits component sourcing from alternative qualified manufacturers while maintaining electrical and mechanical compatibility.

Substiute Parts

LFXTAL033158

IQD Frequency ProductsIn Stock: 888LFXTAL033158 Datasheet

Current PartRFQ

ABLS-3.6864MHZ-B4-T

Abracon LLCIn Stock: 16118ABLS-3.6864MHZ-B4-T Datasheet

SimilarRFQ

ATS037BSM-1

CTS-Frequency ControlsIn Stock: 1562ATS037BSM-1 Datasheet

SimilarRFQ

ATS037SM-1

CTS-Frequency ControlsIn Stock: 5238ATS037SM-1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LFXTAL033158 is determined by strict alignment with the following parameters:

Critical Matching Requirements:

• Frequency: 3.6864 MHz (exact match required)
• Frequency Tolerance: ±30ppm (substitute must meet or exceed this specification)
• Package / Case: HC-49/US (physical and electrical footprint compatibility)
• Mounting Type: Surface Mount (assembly process compatibility)
• Operating Mode: Fundamental (frequency generation method)

Compatible Variation Parameters:

• Load Capacitance: 18pF or 20pF (minor variation acceptable within circuit design margins)
• ESR: 150 - 300 Ohms (range acceptable; lower ESR improves oscillation stability)
• Operating Temperature: -20°C ~ 70°C (all substitutes maintain this range)

Compliance Requirements:

• RoHS3 Compliant (all substitutes must maintain regulatory compliance)
• Active Product Status (ensures ongoing manufacturer support)

The three substitute parts listed (ABLS-3.6864MHZ-B4-T, ATS037BSM-1, ATS037SM-1) meet all critical parameters. Load capacitance variation (18pF vs 20pF) and ESR differences (150 - 300 Ohms) fall within acceptable engineering tolerances for this crystal oscillator category.

Parameter Comparison

Engineering Selection Recommendations

ABLS-3.6864MHZ-B4-T (Abracon LLC): This substitute maintains 18pF load capacitance matching the primary part. ESR is reduced to 180 Ohms, providing improved oscillation stability compared to the LFXTAL033158. All electrical parameters align with substitution requirements. RoHS3 compliance and Active product status ensure regulatory and supply chain continuity. REACH status is Affected; verify compliance requirements for your application jurisdiction.

ATS037BSM-1 (CTS-Frequency Controls): This substitute maintains 18pF load capacitance and provides the lowest ESR at 150 Ohms, delivering optimal oscillation performance. All critical parameters match substitution criteria. RoHS3 compliance and Active product status are confirmed. MSL rating of 1 (Unlimited) indicates superior moisture handling. REACH status is Unaffected, providing regulatory advantage in certain markets.

ATS037SM-1 (CTS-Frequency Controls): This substitute operates with 20pF load capacitance, a 2pF variation from the primary part. This difference is within acceptable engineering tolerance for crystal oscillator circuit design. ESR of 150 Ohms matches ATS037BSM-1, providing optimal stability. RoHS3 compliance and Active product status are confirmed. MSL rating of 1 (Unlimited) and REACH Unaffected status provide regulatory advantages. Load capacitance variation requires circuit verification before deployment.

Selection Basis: All three substitutes are qualified for direct replacement based on frequency, tolerance, package, and operating mode alignment. Selection should prioritize: (1) inventory availability for project timeline, (2) ESR performance requirements for oscillation margin, (3) load capacitance compatibility with existing circuit design, and (4) regulatory compliance status for target markets.

Frequently Asked Questions (FAQ)

Q: Can ATS037SM-1 (20pF) directly replace LFXTAL033158 (18pF)?

A: ATS037SM-1 is electrically compatible as a substitute. The 20pF load capacitance differs by 2pF from the primary part. This variation falls within acceptable tolerance for HC-49/US crystal oscillators. However, circuit tuning capacitance may require adjustment to maintain specified frequency tolerance. Verify load capacitance compatibility with your oscillator circuit design before production deployment.

Q: What is the significance of ESR differences between substitutes?

A: ESR (Equivalent Series Resistance) affects crystal oscillation startup and stability. Lower ESR values (150 Ohms in ATS037BSM-1 and ATS037SM-1) provide better oscillation margin and faster startup compared to higher ESR (300 Ohms in LFXTAL033158, 180 Ohms in ABLS-3.6864MHZ-B4-T). All listed substitutes operate within acceptable ESR range for this frequency and package category. Selection should align with your circuit's oscillator design specifications.

Q: Are all substitutes physically compatible with the same PCB footprint?

A: All substitutes use HC-49/US package with surface mount configuration. Physical dimensions vary slightly: LFXTAL033158 and ATS037BSM-1 are 0.449" x 0.150" and 0.437" x 0.190" respectively. These minor variations (within 0.012" tolerance) are accommodated by standard HC-49/US PCB footprints. Verify your PCB layout accommodates the maximum height specification (4.30mm) for all parts.

Q: What compliance differences exist between substitutes?

A: All substitutes are RoHS3 compliant and Active status. REACH status differs: ABLS-3.6864MHZ-B4-T is REACH Affected; ATS037BSM-1 and ATS037SM-1 are REACH Unaffected. For applications in REACH-regulated markets, ATS037BSM-1 or ATS037SM-1 provide regulatory advantage. Verify REACH compliance requirements for your target application and geography.

Q: Can substitutes be mixed in the same production batch?

A: All substitutes meet identical frequency (3.6864 MHz), tolerance (±30ppm), and operating mode (Fundamental) specifications. Mixing substitutes in the same batch is permissible from an electrical standpoint. However, ESR and load capacitance variations may introduce minor performance differences. For applications requiring consistent oscillation characteristics across units, maintain single-source substitution within production batches.

Q: What is MSL (Moisture Sensitivity Level) and why does it matter?

A: MSL indicates moisture absorption sensitivity during storage and assembly. LFXTAL033158 and ABLS-3.6864MHZ-B4-T list MSL as Not Applicable, indicating robust moisture resistance. ATS037BSM-1 and ATS037SM-1 specify MSL 1 (Unlimited), providing superior moisture handling. For applications in high-humidity environments or with extended storage periods, MSL 1 rated parts offer enhanced reliability.