LFXTAL019833 Equivalent & Substitute Parts Reference

Part Overview

The LFXTAL019833 is a 4.0 MHz surface mount crystal oscillator manufactured by IQD Frequency Products. This component operates in fundamental mode with a load capacitance of 20pF and equivalent series resistance of 130 Ohms, housed in an HC-49/US package. The part is Active status and ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter range, enabling design flexibility and supply chain alternatives.

Key Parameters

Parameter	Value	Unit
Frequency	4.0000	MHz
Frequency Tolerance	±30	ppm
Load Capacitance	20	pF
ESR (Equivalent Series Resistance)	130	Ohms
Operating Mode	Fundamental	—
Operating Temperature Range	-20 to 70	°C
Package / Case	HC-49/US	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Parameters:

Frequency: 4.0000 MHz (exact match required)
Frequency Tolerance: ±30 ppm (exact match required)
Operating Mode: Fundamental (exact match required)
Package / Case: HC-49/US (exact match required)
Mounting Type: Surface Mount (exact match required)
Operating Temperature Range: -20°C to 70°C (exact match required)

Secondary Compatibility Parameters:

Load Capacitance: 20pF or 18pF (within acceptable circuit design tolerance)
ESR: 130 Ohms, 120 Ohms, or 180 Ohms (within acceptable circuit design tolerance)
Frequency Stability: ±50 ppm (consistent across all parts)

All substitute parts listed maintain the primary compatibility parameters. Variations in load capacitance and ESR represent acceptable substitutions when circuit design accommodates these electrical differences.

Parameter Comparison

Part Number	Manufacturer	Frequency (MHz)	Frequency Tolerance (ppm)	Load Capacitance (pF)	ESR (Ohms)	Package	Size L x W (mm)	Height Max (mm)	RoHS Status	Inventory (Pcs)
LFXTAL019833	IQD Frequency Products	4.0000	±30	20	130	HC-49/US	11.40 x 3.80	4.30	ROHS3	845
LFXTAL024940	IQD Frequency Products	4.0000	±30	18	130	HC-49/US	11.40 x 3.80	4.30	ROHS3	3348
ABLS-4.000MHZ-B4-T	Abracon LLC	4.0000	±30	18	180	HC-49/US	11.40 x 4.70	4.20	ROHS3	2200
ATS040BSM-1	CTS-Frequency Controls	4.0000	±30	18	120	HC-49/US	11.10 x 4.83	4.30	ROHS3	2022
ATS040SM-1	CTS-Frequency Controls	4.0000	±30	20	120	HC-49/US	11.10 x 4.83	4.30	ROHS3	77707

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, meeting regulatory requirements equivalent to the LFXTAL019833.

LFXTAL024940 (IQD Frequency Products): Identical manufacturer and series (HC49/4HSMX). Load capacitance differs at 18pF versus 20pF; ESR remains 130 Ohms. Mechanical dimensions and height are identical. Highest inventory availability among IQD alternatives.

ATS040SM-1 (CTS-Frequency Controls): Exact load capacitance match at 20pF. ESR is 120 Ohms versus 130 Ohms. Mechanical dimensions vary slightly (11.10mm x 4.83mm versus 11.40mm x 3.80mm). Highest overall inventory availability at 77,707 pieces. MSL rating is 1 (Unlimited).

ATS040BSM-1 (CTS-Frequency Controls): Load capacitance at 18pF. ESR is 120 Ohms. Mechanical dimensions vary (11.10mm x 4.83mm). MSL rating is 1 (Unlimited).

ABLS-4.000MHZ-B4-T (Abracon LLC): Load capacitance at 18pF. ESR is 180 Ohms (highest among substitutes). Mechanical width is 4.70mm (widest). REACH Status is Affected, differing from the main part.

Frequently Asked Questions (FAQ)

Q: Can LFXTAL024940 replace LFXTAL019833 directly?

A: Yes. Both parts are manufactured by IQD Frequency Products in the same HC49/4HSMX series. The primary difference is load capacitance (18pF versus 20pF). Circuit design must accommodate this capacitance variation. All other electrical and mechanical parameters are identical.

Q: What is the impact of different ESR values among substitutes?

A: ESR affects circuit startup time and oscillation amplitude. The LFXTAL019833 has 130 Ohms ESR. Substitutes range from 120 Ohms to 180 Ohms. Lower ESR (120 Ohms) may reduce startup time; higher ESR (180 Ohms) may increase it. Circuit design must verify compatibility with the specific ESR value selected.

Q: Are there mechanical compatibility concerns with substitute parts?

A: Mechanical dimensions vary slightly across manufacturers. The LFXTAL019833 measures 11.40mm x 3.80mm. CTS-Frequency Controls parts measure 11.10mm x 4.83mm (narrower length, wider width). Abracon measures 11.40mm x 4.70mm (same length, wider width). PCB layout and component placement must accommodate these dimensional differences.

Q: Which substitute has the best inventory availability?

A: ATS040SM-1 (CTS-Frequency Controls) has 77,707 pieces in stock, significantly higher than other alternatives. This part also matches the 20pF load capacitance of the main part.

Q: Does load capacitance affect circuit operation?

A: Yes. Load capacitance is a critical parameter for crystal oscillator circuit design. The LFXTAL019833 specifies 20pF. Substitutes with 18pF load capacitance require circuit tuning adjustments. The circuit designer must verify that the oscillator circuit is designed to accommodate the selected load capacitance value.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the regulatory status of LFXTAL019833.

Q: What does MSL rating mean for these parts?

A: MSL (Moisture Sensitivity Level) indicates moisture exposure limits during storage and handling. LFXTAL019833 has MSL Not Applicable. CTS-Frequency Controls parts (ATS040BSM-1 and ATS040SM-1) have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Abracon and IQD parts have MSL Not Applicable.

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