HCM4925000000AQJT 25 MHz Crystal Equivalent & Substitute Parts

Part Overview

The HCM4925000000AQJT is a 25 MHz surface mount crystal manufactured by Citizen Finedevice Co Ltd. This fundamental mode crystal operates across the -20°C to 70°C temperature range with ±30ppm frequency tolerance and 18pF load capacitance. The part is actively produced and ROHS3 compliant, making it suitable for standard commercial and industrial applications requiring precise frequency reference.

Substitute parts are identified when equivalent electrical and mechanical parameters allow direct replacement without circuit redesign. Substitution becomes necessary due to inventory availability, lead time constraints, or manufacturing discontinuation of specific variants.

Key Parameters

Parameter	Value	Unit
Frequency	25	MHz
Frequency Tolerance	±30	ppm
Load Capacitance	18	pF
ESR (Equivalent Series Resistance)	50	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 for the HCM4925000000AQJT is determined by the following critical parameters:

Frequency: 25 MHz (exact match required)
Frequency Tolerance: ±30ppm (exact match required)
Operating Mode: Fundamental (exact match required)
Operating Temperature Range: -20°C to 70°C (exact match required)
Package / Case: HC-49/US (exact match required)
Mounting Type: Surface Mount (exact match required)

Load capacitance and ESR are secondary parameters that may vary within acceptable ranges for circuit operation. Frequency stability (±50ppm) is consistent across all identified substitutes. All substitute parts maintain ROHS3 compliance and active product status.

Three substitute parts meet these criteria: ABLS-25.000MHZ-B4-F-T (Abracon LLC), ATS250BSM-1 (CTS-Frequency Controls), and ATS25ASM-1 (CTS-Frequency Controls).

Parameter Comparison

Parameter	HCM4925000000AQJT	ABLS-25.000MHZ-B4-F-T	ATS250BSM-1	ATS25ASM-1
Manufacturer	Citizen Finedevice Co Ltd	Abracon LLC	CTS-Frequency Controls	CTS-Frequency Controls
Frequency	25 MHz	25 MHz	25 MHz	25 MHz
Frequency Tolerance	±30ppm	±30ppm	±30ppm	±30ppm
Frequency Stability	±50ppm	±50ppm	±50ppm	±50ppm
Load Capacitance	18pF	18pF	18pF	20pF
ESR	50 Ohms	40 Ohms	30 Ohms	30 Ohms
Operating Mode	Fundamental	Fundamental	Fundamental	Fundamental
Operating Temperature	-20 to 70°C	-20 to 70°C	-20 to 70°C	-20 to 70°C
Package / Case	HC-49/US	HC-49/US	HC-49/US	HC-49/US
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Size / Dimension	11.40mm x 4.70mm	11.40mm x 4.70mm	11.10mm x 4.83mm	11.10mm x 4.83mm
Height - Seated (Max)	4.30mm	4.20mm	4.30mm	4.30mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active
Packaging	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

All three substitute parts are actively produced and ROHS3 compliant, meeting the compliance requirements of the HCM4925000000AQJT.

ABLS-25.000MHZ-B4-F-T maintains identical frequency, tolerance, load capacitance, and operating temperature specifications. ESR is 40 Ohms compared to 50 Ohms on the main part. Physical dimensions are identical. This part is available in Cut Tape and Digi-Reel packaging.

ATS250BSM-1 maintains identical frequency, tolerance, operating temperature, and load capacitance specifications. ESR is 30 Ohms. Physical dimensions differ slightly (11.10mm x 4.83mm versus 11.40mm x 4.70mm), with identical seated height. This part is available in Tape & Reel packaging.

ATS25ASM-1 maintains identical frequency, tolerance, and operating temperature specifications. Load capacitance is 20pF compared to 18pF on the main part. ESR is 30 Ohms. Physical dimensions and seated height are identical to ATS250BSM-1. This part is available in Tape & Reel packaging with the highest inventory availability.

Frequently Asked Questions (FAQ)

Q: Can ATS25ASM-1 be used as a direct substitute if the load capacitance is 20pF instead of 18pF?

A: Load capacitance is a secondary parameter that affects circuit resonance characteristics. The 20pF specification on ATS25ASM-1 differs from the 18pF specification on HCM4925000000AQJT. Circuit validation is required to confirm compatibility with your specific oscillator circuit design.

Q: What is the difference between the three substitute parts?

A: ABLS-25.000MHZ-B4-F-T has 40 Ohms ESR with identical load capacitance (18pF). ATS250BSM-1 has 30 Ohms ESR with identical load capacitance (18pF). ATS25ASM-1 has 30 Ohms ESR with 20pF load capacitance. All three maintain identical frequency, tolerance, and operating temperature specifications.

Q: Are there packaging differences between the main part and substitutes?

A: HCM4925000000AQJT is supplied in Tape & Reel (TR) packaging. ABLS-25.000MHZ-B4-F-T is supplied in Cut Tape (CT) and Digi-Reel packaging. ATS250BSM-1 and ATS25ASM-1 are supplied in Tape & Reel (TR) packaging, matching the main part.

Q: Do all parts meet RoHS compliance?

A: All four parts (main part and three substitutes) are ROHS3 compliant and actively produced.

Q: What are the physical dimension differences?

A: HCM4925000000AQJT and ABLS-25.000MHZ-B4-F-T share identical dimensions (11.40mm x 4.70mm). ATS250BSM-1 and ATS25ASM-1 have slightly different dimensions (11.10mm x 4.83mm). Seated heights are 4.30mm for HCM4925000000AQJT, 4.20mm for ABLS-25.000MHZ-B4-F-T, and 4.30mm for both CTS parts.

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