HCM494000000ABKT Equivalent & Substitute Parts

Part Overview

The HCM494000000ABKT is a 4.0 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 ±30ppm frequency tolerance and 20pF load capacitance. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within specified parameter ranges.

Substiute Parts

HCM494000000ABKT

Citizen Finedevice Co LtdIn Stock: 953HCM494000000ABKT 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 is determined by the following critical parameters:

• Frequency: Must be 4 MHz (exact match required)
• Frequency Tolerance: Must be ±30ppm (exact match required)
• Package / Case: Must be HC-49/US (exact match required)
• Mounting Type: Must be Surface Mount (exact match required)
• Operating Temperature Range: Must be -10°C ~ 60°C or broader (exact match or superior range required)
• RoHS Status: Must be ROHS3 Compliant (exact match required)

Secondary parameters including Load Capacitance and ESR may vary within acceptable ranges for circuit operation, provided the primary parameters remain unchanged. All substitute parts listed meet these substitution criteria.

Parameter Comparison

Engineering Selection Recommendations

All three parts—HCM494000000ABKT, HCM494000000ABJT, and LFXTAL003071—are active products with ROHS3 compliance and REACH unaffected status. Selection between these parts should be based on load capacitance requirements specific to the circuit design, as this parameter varies across the three options (20pF, 18pF, and 16pF respectively). ESR values differ slightly (150 Ohms for Citizen parts, 130 Ohms for IQD), which may influence circuit performance in applications with tight impedance specifications. All parts maintain identical frequency, tolerance, operating temperature range, and package specifications.

Frequently Asked Questions (FAQ)

Q: Can HCM494000000ABJT replace HCM494000000ABKT?

A: Yes. Both parts share identical frequency (4 MHz), frequency tolerance (±30ppm), package (HC-49/US), mounting type (surface mount), operating temperature range (-10°C ~ 60°C), and compliance certifications. The load capacitance differs (18pF vs 20pF), which must be evaluated against circuit design requirements.

Q: Can LFXTAL003071 replace HCM494000000ABKT?

A: Yes. Both parts meet all critical substitution parameters: frequency (4 MHz), frequency tolerance (±30ppm), package (HC-49/US), mounting type (surface mount), operating temperature range (-10°C ~ 60°C), and ROHS3 compliance. Load capacitance (16pF vs 20pF) and ESR (130 Ohms vs 150 Ohms) differ and must be evaluated for circuit compatibility.

Q: What is the significance of load capacitance differences?

A: Load capacitance affects the crystal's operating frequency in the circuit. The HCM494000000ABKT specifies 20pF, while substitutes offer 18pF and 16pF. Circuit design must accommodate the specified load capacitance value for the crystal to operate at the intended frequency within tolerance.

Q: Are all parts suitable for RoHS and REACH-regulated applications?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for restricted substance use.

Q: Do the parts have identical physical dimensions?

A: The Citizen parts (HCM494000000ABKT and HCM494000000ABJT) share identical dimensions (0.449" L x 0.185" W). The IQD part (LFXTAL003071) has a slightly narrower width (0.449" L x 0.150" W). All three maintain the same maximum seated height (0.169").