LFXTAL035503 16.384 MHz Crystal Equivalent & Substitute Parts

Part Overview

The LFXTAL035503 is a 16.384 MHz fundamental mode crystal manufactured by IQD Frequency Products, designed for surface mount applications requiring precise frequency reference in embedded systems and timing circuits. This part is actively produced and maintains ROHS3 compliance with full REACH compliance status. Substitute parts are identified to provide supply chain flexibility, inventory availability alternatives, and continuity of design implementation when the primary part becomes unavailable or when procurement optimization is required.

Key Parameters

Parameter	Value	Unit
Frequency	16.384	MHz
Frequency Stability	±50	ppm
Load Capacitance	16	pF
ESR (Equivalent Series Resistance)	70	Ohms
Operating Mode	Fundamental	—
Operating Temperature Range	-10 to 60	°C
Package Type	4-SMD, No Lead	—
Physical Dimensions	3.20 × 2.50 × 0.80	mm (L × W × H)
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the LFXTAL035503 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Frequency: 16.384 MHz (exact match required)
Frequency Stability: ±50 ppm (tolerance specification)
Load Capacitance: 16 pF (circuit design requirement)
ESR: 70 Ohms (oscillator circuit impedance matching)
Operating Mode: Fundamental (frequency generation method)
Package: 4-SMD, No Lead (PCB footprint compatibility)
Physical Dimensions: 3.20 mm × 2.50 mm × 0.80 mm maximum height (board space constraint)
Operating Temperature: -10°C to 60°C (environmental specification)
Compliance: ROHS3 Compliant, REACH Unaffected (regulatory requirement)

The substitute part 830035503 from Würth Elektronik meets all mandatory parameters and is classified as a parametric equivalent.

Parameter Comparison

Parameter	LFXTAL035503 (IQD)	830035503 (Würth Elektronik)	Match Status
Frequency	16.384 MHz	16.384 MHz	Exact Match
Frequency Stability	±50 ppm	±50 ppm	Exact Match
Frequency Tolerance	±50 ppm	±50 ppm	Exact Match
Load Capacitance	16 pF	16 pF	Exact Match
ESR	70 Ohms	70 Ohms	Exact Match
Operating Mode	Fundamental	Fundamental	Exact Match
Operating Temperature	-10°C to 60°C	-10°C to 60°C	Exact Match
Package / Case	4-SMD, No Lead	4-SMD, No Lead	Exact Match
Dimensions (L × W × H)	3.20 × 2.50 × 0.80 mm	3.20 × 2.50 × 0.80 mm	Exact Match
Mounting Type	Surface Mount	Surface Mount	Exact Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Exact Match
REACH Status	REACH Unaffected	REACH Unaffected	Exact Match
Product Status	Active	Active	Exact Match

Engineering Selection Recommendations

Both the LFXTAL035503 and 830035503 are active production parts with full regulatory compliance. Selection between these parts is based on:

Supply Chain Availability: The 830035503 (Würth Elektronik) currently maintains higher inventory levels (3,690 pcs) compared to the LFXTAL035503 (918 pcs), making it suitable for high-volume procurement or extended lead-time mitigation.

Regulatory Compliance: Both parts maintain identical ROHS3 compliance and REACH unaffected status, ensuring equivalent environmental and regulatory qualification for all applications.

Functional Equivalence: Complete parametric alignment across frequency, stability, load capacitance, ESR, temperature range, and package specifications ensures direct substitution without circuit redesign or oscillator tuning adjustment.

Manufacturing Continuity: Both manufacturers maintain active product status, supporting long-term design lifecycle requirements and production continuity.

Frequently Asked Questions (FAQ)

Q: Can the 830035503 be used as a direct replacement for the LFXTAL035503 without PCB modification?

A: Yes. Both parts share identical package dimensions (3.20 × 2.50 × 0.80 mm), 4-SMD no-lead configuration, and mounting type. PCB footprints are directly compatible without modification.

Q: Are the frequency and stability specifications identical between these parts?

A: Yes. Both parts operate at 16.384 MHz with ±50 ppm frequency stability and ±50 ppm frequency tolerance. Oscillator circuit tuning and load capacitance matching remain unchanged.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both the LFXTAL035503 and 830035503 are ROHS3 compliant and REACH unaffected, meeting identical regulatory requirements for industrial and commercial applications.

Q: What is the ESR specification, and does it differ between manufacturers?

A: Both parts specify 70 Ohms ESR. This parameter determines oscillator circuit impedance matching and startup characteristics. Identical ESR values ensure equivalent circuit performance.

Q: Are there any temperature range differences?

A: No. Both parts operate across the identical temperature range of -10°C to 60°C, supporting equivalent environmental specifications for embedded systems and industrial timing applications.

Q: Which part should be selected for new designs?

A: Selection is based on procurement strategy and inventory availability. Both parts are functionally and electrically equivalent. The 830035503 offers higher current inventory availability, while the LFXTAL035503 represents the original design specification.

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