FD4000123 Equivalent & Substitute Parts

Part Overview

The FD4000123 is a 40 MHz XO (Standard) CMOS oscillator manufactured by Diodes Incorporated, part of the SaRonix-eCera™ FD series. This surface mount crystal oscillator operates at 2.5V with enable/disable functionality, designed for applications requiring stable frequency generation in compact form factors. The part is currently active in production with 934 units in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Frequency	40	MHz
Output Type	CMOS	-
Supply Voltage	2.5	V
Function	Enable/Disable	-
Package Type	4-SMD, No Lead	-
Mounting Type	Surface Mount	-
Physical Dimensions	5.00 x 3.20	mm
Frequency Stability	±25	ppm
Operating Temperature Range	-20 to 70	°C
Maximum Supply Current	25	mA
Disable Mode Current	10	µA
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution eligibility for the FD4000123 is determined by strict equivalence across the following critical parameters:

Frequency: Exact match at 40 MHz
Output Configuration: CMOS output type
Supply Voltage: 2.5V operation
Enable/Disable Function: Required control capability
Package Specification: 4-SMD, No Lead form factor
Physical Compatibility: Identical footprint dimensions (5.00mm x 3.20mm)
Compliance: RoHS and REACH status alignment

The substitute part 7C-40.000MCB-T (TXC CORPORATION) meets these core electrical and mechanical requirements. Variations in frequency stability, operating temperature range, maximum supply current, and seated height are within acceptable tolerance ranges for this oscillator category and do not preclude substitution.

Parameter Comparison

Parameter	FD4000123 (Diodes Inc.)	7C-40.000MCB-T (TXC)	Compatibility
Manufacturer Part Number	FD4000123	7C-40.000MCB-T	Different
Frequency	40 MHz	40 MHz	Equivalent
Output Type	CMOS	CMOS	Equivalent
Supply Voltage	2.5V	2.5V	Equivalent
Function	Enable/Disable	Enable/Disable	Equivalent
Package / Case	4-SMD, No Lead	4-SMD, No Lead	Equivalent
Dimensions (L x W)	5.00 x 3.20 mm	5.00 x 3.20 mm	Equivalent
Frequency Stability	±25 ppm	±50 ppm	Acceptable Variation
Operating Temperature	-20 to 70°C	-10 to 70°C	Acceptable Variation
Maximum Supply Current	25 mA	30 mA	Acceptable Variation
Disable Mode Current	10 µA	Not Specified	Data Not Available
Height - Seated (Max)	1.30 mm	1.40 mm	Acceptable Variation
RoHS Status	ROHS3 Compliant	RoHS Compliant	Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

Primary Part: FD4000123 (Diodes Incorporated)

The FD4000123 is the specified component with active production status and ROHS3 compliance. Selection of this part is recommended when supply is available and design specifications require the tighter frequency stability of ±25 ppm and extended lower operating temperature limit of -20°C.

Substitute Part: 7C-40.000MCB-T (TXC CORPORATION)

The 7C-40.000MCB-T is qualified as a direct substitute based on electrical equivalence and mechanical compatibility. This part maintains identical frequency, output type, supply voltage, and package configuration. The substitute exhibits acceptable variations in frequency stability (±50 ppm), operating temperature range (-10 to 70°C), and maximum supply current (30 mA). Both parts carry equivalent compliance certifications (RoHS and REACH). The 7C-40.000MCB-T is available in higher inventory (2881 units) and may be selected when supply constraints on the primary part exist or when the specified parameter variations are acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can the 7C-40.000MCB-T replace the FD4000123 in all applications?

A: The 7C-40.000MCB-T is electrically and mechanically compatible for applications where the specified parameter variations are acceptable. The substitute exhibits ±50 ppm frequency stability versus ±25 ppm on the primary part, and operates from -10°C minimum versus -20°C on the primary part. Verify application requirements for frequency tolerance and temperature range before substitution.

Q: Are the physical dimensions identical between these parts?

A: Both parts share identical footprint dimensions of 5.00mm x 3.20mm and use the same 4-SMD, No Lead package type. The seated height differs by 0.10mm (1.30mm versus 1.40mm), which is within standard PCB assembly tolerances and does not affect mechanical compatibility.

Q: What is the difference in frequency stability between these oscillators?

A: The FD4000123 provides ±25 ppm frequency stability, while the 7C-40.000MCB-T provides ±50 ppm. The primary part offers tighter frequency tolerance. Applications requiring higher frequency precision should specify the FD4000123.

Q: Do both parts meet the same compliance standards?

A: Both parts are RoHS compliant and REACH unaffected. The FD4000123 carries ROHS3 certification, while the 7C-40.000MCB-T carries standard RoHS certification. Both meet environmental compliance requirements for industrial and commercial applications.

Q: What is the operating temperature difference between these parts?

A: The FD4000123 operates from -20°C to 70°C, while the 7C-40.000MCB-T operates from -10°C to 70°C. Applications requiring operation below -10°C must use the primary part.

Q: Is the packaging format the same for both parts?

A: The FD4000123 is supplied in standard packaging, while the 7C-40.000MCB-T is supplied in Tape & Reel (TR) format. Both use identical 4-SMD, No Lead package types suitable for automated assembly. Tape & Reel packaging is standard for high-volume production environments.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message