Equivalent & Substitute Parts for HCM494000000ABIT

Part Overview

The HCM494000000ABIT is a 4.0000 MHz crystal oscillator manufactured by Citizen Finedevice Co Ltd, designed for surface mount applications in the HC-49/US package. This active product operates at fundamental mode with a load capacitance of 16pF and equivalent series resistance of 150 Ohms. Finding equivalent and substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and accommodate varying inventory availability across component distributors.

Substiute Parts

HCM494000000ABIT

Citizen Finedevice Co LtdIn Stock: 1119HCM494000000ABIT Datasheet

Current PartRFQ

HCM494000000ABJT

Citizen Finedevice Co LtdIn Stock: 3453HCM494000000ABJT Datasheet

SimilarRFQ

LFXTAL003071

IQD Frequency ProductsIn Stock: 2534LFXTAL003071 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HCM494000000ABIT is determined by the following critical parameters:

• Frequency: Must be 4 MHz (exact match required)
• Frequency Tolerance: Must be ±30ppm or tighter
• Package / Case: Must be HC-49/US (mechanical and electrical compatibility)
• Mounting Type: Must be Surface Mount
• Operating Temperature Range: Must cover or exceed -10°C ~ 60°C
• Load Capacitance: 16pF is the primary specification; 18pF represents a minor variation within acceptable design margins
• ESR (Equivalent Series Resistance): 150 Ohms is nominal; variations between 130-150 Ohms are acceptable within crystal oscillator design tolerances
• RoHS Compliance: Must maintain ROHS3 Compliant status

Two substitute parts meet these criteria: HCM494000000ABJT (same manufacturer, 18pF load capacitance) and LFXTAL003071 (alternative manufacturer, 16pF load capacitance, 130 Ohms ESR).

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products with full ROHS3 compliance and REACH unaffected status, matching the regulatory posture of the main part.

HCM494000000ABJT is manufactured by the same supplier (Citizen Finedevice Co Ltd) and maintains identical electrical specifications except for load capacitance (18pF versus 16pF). This minor variation is within standard crystal oscillator design tolerances and does not affect functional compatibility in most applications. This part offers the advantage of higher inventory availability (3400 pcs in stock versus 1030 pcs for the main part).

LFXTAL003071 is manufactured by IQD Frequency Products and matches the main part's 16pF load capacitance specification. The ESR is 130 Ohms compared to 150 Ohms in the main part, representing a 13% reduction in equivalent series resistance. This lower ESR may provide marginal improvements in oscillation stability and startup characteristics. The physical dimensions differ slightly (width: 3.80mm versus 4.70mm), though both conform to HC-49/US package specifications. Inventory availability is 2489 pcs in stock.

Frequently Asked Questions (FAQ)

Q: Can HCM494000000ABJT be used as a direct replacement for HCM494000000ABIT?

A: Yes. Both parts share identical frequency (4 MHz), frequency tolerance (±30ppm), ESR (150 Ohms), package (HC-49/US), and operating temperature range. The load capacitance difference (18pF versus 16pF) is within acceptable design margins for crystal oscillator circuits and does not prevent direct substitution in standard applications.

Q: What is the significance of the load capacitance difference between 16pF and 18pF?

A: Load capacitance specifies the external capacitive load the crystal is designed to operate into. A 2pF difference represents approximately 12.5% variation. In most circuit designs, this difference is accommodated by the tuning range of the oscillator circuit and does not affect frequency stability or functionality. Circuit designers should verify that their specific application's tuning network can accommodate this variation.

Q: How does the ESR difference between HCM494000000ABIT (150 Ohms) and LFXTAL003071 (130 Ohms) affect performance?

A: ESR (Equivalent Series Resistance) affects oscillation startup time and power consumption. Lower ESR (130 Ohms) generally results in faster startup and lower power dissipation. The 20 Ohm difference (13% reduction) is minor and typically does not produce measurable performance differences in standard applications. Both values are within normal operating ranges for 4 MHz crystals in the HC-49/US package.

Q: Are there any physical dimension differences that affect PCB layout?

A: HCM494000000ABIT and HCM494000000ABJT have identical dimensions (11.40mm L x 4.70mm W x 4.30mm H). LFXTAL003071 has a slightly narrower width (11.40mm L x 3.80mm W x 4.30mm H). All three parts conform to HC-49/US package specifications and use identical footprints for surface mount assembly. The width difference does not affect PCB layout compatibility.

Q: Do all three parts meet the same regulatory and compliance requirements?

A: Yes. HCM494000000ABIT, HCM494000000ABJT, and LFXTAL003071 are all ROHS3 Compliant, REACH Unaffected, and classified as EAR99 for export control purposes. All three parts carry HTSUS code 8541.60.0030 and meet identical regulatory standards.