FH4000074Z 40 MHz Crystal Equivalent & Substitute Parts

Part Overview

The FH4000074Z is a 40 MHz fundamental mode crystal manufactured by Diodes Incorporated in the SaRonix-eCera™ FH series. This surface mount device features an 8pF load capacitance, 30 Ohms ESR, and is packaged in a 4-SMD, No Lead configuration measuring 2.50mm x 2.00mm. The part is Active status and ROHS3 compliant with MSL 1 rating. Equivalent and substitute parts are identified based on matching frequency, stability, operating temperature range, mounting type, and package configuration while allowing variations in load capacitance and ESR within acceptable design parameters.

Key Parameters

Parameter	Value
Manufacturer Part Number	FH4000074Z
Manufacturer	Diodes Incorporated
Frequency	40 MHz
Frequency Stability	±10ppm
Load Capacitance	8pF
ESR (Equivalent Series Resistance)	30 Ohms
Operating Temperature Range	-30°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	4-SMD, No Lead
Size / Dimension	2.50mm x 2.00mm
Product Status	Active
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the FH4000074Z is determined by the following critical parameters: frequency (40 MHz), frequency stability (±10ppm), operating temperature range (-30°C ~ 85°C), mounting type (Surface Mount), and package configuration (4-SMD, No Lead). Load capacitance and ESR are secondary parameters that may vary between substitutes based on circuit design requirements. All identified substitutes maintain the same frequency, stability, temperature range, and package type. Variations in load capacitance (7pF to 10pF) and ESR (30 to 50 Ohms) are acceptable within standard crystal oscillator design tolerances.

Parameter Comparison

Part Number	Manufacturer	Frequency	Frequency Stability	Load Capacitance	ESR (Ohms)	Operating Temperature	Package	Size (mm)	Product Status	RoHS Status
FH4000074Z	Diodes Incorporated	40 MHz	±10ppm	8pF	30	-30°C ~ 85°C	4-SMD, No Lead	2.50 x 2.00	Active	ROHS3
FW400WFQA1	Diodes Incorporated	40 MHz	±10ppm	7pF	40	-30°C ~ 85°C	4-SMD, No Lead	2.00 x 1.60	Active	ROHS3
ECS-400-10-36-CKY-TR	ECS Inc.	40 MHz	±10ppm	10pF	40	-30°C ~ 85°C	4-SMD, No Lead	2.50 x 2.00	Active	ROHS3
ECS-400-10-36B-CKY-TR	ECS Inc.	40 MHz	±10ppm	10pF	30	-30°C ~ 85°C	4-SMD, No Lead	2.50 x 2.00	Active	ROHS3
ECS-400-10-37B-CKY-TR	ECS Inc.	40 MHz	±10ppm	10pF	40	-30°C ~ 85°C	4-SMD, No Lead	2.00 x 1.60	Active	ROHS3
ECS-400-9-36B-CKY-TR	ECS Inc.	40 MHz	±10ppm	9pF	30	-30°C ~ 85°C	4-SMD, No Lead	2.50 x 2.00	Active	ROHS3
XRCGB40M000F1S1BR0	Murata Electronics	40 MHz	±10ppm	8pF	50	-30°C ~ 85°C	4-SMD, No Lead	2.00 x 1.60	Active	ROHS3

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and ROHS3 compliance, ensuring continued availability and regulatory alignment with the original FH4000074Z. Selection among substitutes depends on specific circuit load capacitance requirements and ESR tolerance specifications. ECS-400-10-36B-CKY-TR and ECS-400-9-36B-CKY-TR match the original 30 Ohms ESR specification. FW400WFQA1 and XRCGB40M000F1S1BR0 offer smaller package footprints (2.00mm x 1.60mm) for space-constrained applications. ECS-400-10-36-CKY-TR and ECS-400-10-37B-CKY-TR provide 10pF load capacitance with 40 Ohms ESR for designs requiring higher capacitive loading. All parts maintain identical frequency stability (±10ppm) and operating temperature range (-30°C ~ 85°C).

Frequently Asked Questions (FAQ)

Q: Can FW400WFQA1 directly replace FH4000074Z? A: FW400WFQA1 is functionally equivalent in frequency, stability, and temperature range. The primary differences are load capacitance (7pF vs 8pF) and ESR (40 Ohms vs 30 Ohms). Direct substitution is valid if the circuit design accommodates these parameter variations. The smaller package footprint (2.00mm x 1.60mm vs 2.50mm x 2.00mm) may require PCB layout adjustment.

Q: What is the difference between ECS-400-10-36-CKY-TR and ECS-400-10-36B-CKY-TR? A: Both parts share identical frequency, stability, temperature range, and package configuration. The primary difference is ESR: ECS-400-10-36-CKY-TR has 40 Ohms ESR while ECS-400-10-36B-CKY-TR has 30 Ohms ESR, matching the original FH4000074Z specification. Selection depends on circuit ESR tolerance requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes, all listed substitute parts are ROHS3 compliant with MSL 1 rating, maintaining regulatory compliance with the original FH4000074Z.

Q: Can I use XRCGB40M000F1S1BR0 as a substitute despite the 50 Ohms ESR? A: XRCGB40M000F1S1BR0 maintains all critical parameters: 40 MHz frequency, ±10ppm stability, -30°C ~ 85°C operating range, and 4-SMD No Lead package. The 50 Ohms ESR is higher than the original 30 Ohms specification. Substitution is valid only if circuit design tolerates this ESR increase.

Q: What load capacitance options are available among substitutes? A: Substitute parts offer load capacitance values of 7pF (FW400WFQA1), 8pF (XRCGB40M000F1S1BR0), 9pF (ECS-400-9-36B-CKY-TR), and 10pF (ECS-400-10-36-CKY-TR, ECS-400-10-36B-CKY-TR, ECS-400-10-37B-CKY-TR). Selection must align with circuit load capacitance specifications.

Q: Do package size differences affect substitution? A: Package dimensions vary between substitutes. FH4000074Z, ECS-400-10-36-CKY-TR, ECS-400-10-36B-CKY-TR, and ECS-400-9-36B-CKY-TR use 2.50mm x 2.00mm footprints. FW400WFQA1, ECS-400-10-37B-CKY-TR, and XRCGB40M000F1S1BR0 use 2.00mm x 1.60mm footprints. Smaller packages require PCB layout verification for compatibility.

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