FN4000157 40 MHz CMOS Oscillator Equivalent & Substitute Parts

Part Overview

The FN4000157 is a 40 MHz XO (Standard) CMOS oscillator manufactured by Diodes Incorporated, part of the SaRonix-eCera™ FN series. This surface mount crystal oscillator operates at 3.3V with enable/disable functionality and is housed in a 4-SMD, No Lead package measuring 7.00mm x 5.00mm. The device is currently in active production status with 923 units in stock. Substitute parts are identified when component availability is limited, supply chain disruptions occur, or inventory requirements necessitate alternative sourcing from qualified manufacturers meeting identical electrical and mechanical specifications.

Substiute Parts

FN4000157

Diodes IncorporatedIn Stock: 947FN4000157 Datasheet

Current PartRFQ

SXO75C3A271-40.000M

Suntsu Electronics, Inc.In Stock: 1438SXO75C3A271-40.000M Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FN4000157 is determined by strict equivalence across the following critical parameters:

• Frequency: 40 MHz (exact match required)
• Output Configuration: CMOS (exact match required)
• Supply Voltage: 3.3V (exact match required)
• Enable/Disable Function: Present (exact match required)
• Frequency Stability: ±50ppm (exact match required)
• Operating Temperature Range: -20°C ~ 70°C (exact match required)
• Maximum Supply Current: 25mA (exact match required)
• Package Type: 4-SMD, No Lead (exact match required)
• Package Dimensions: 7.00mm x 5.00mm (exact match required)
• Regulatory Compliance: ROHS3 Compliant (exact match required)

The SXO75C3A271-40.000M from Suntsu Electronics, Inc. meets all specified electrical and mechanical parameters and qualifies as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the FN4000157 and SXO75C3A271-40.000M are active production components with ROHS3 compliance and equivalent electrical specifications. The SXO75C3A271-40.000M features a lower maximum seated height (1.60mm versus 1.80mm), which provides additional clearance margin in space-constrained PCB layouts. Both devices carry unlimited moisture sensitivity level (MSL 1), eliminating moisture-related handling constraints. Selection between these parts should be based on availability, lead time, and cost considerations, as all functional and mechanical parameters are equivalent.

Frequently Asked Questions (FAQ)

Q: Can the SXO75C3A271-40.000M be used as a direct replacement for the FN4000157 in existing designs?

A: Yes. Both oscillators meet identical electrical specifications (40 MHz, CMOS output, 3.3V supply, ±50ppm stability, -20°C to 70°C operation) and share the same 4-SMD, No Lead package footprint (7.00mm x 5.00mm). The SXO75C3A271-40.000M has a lower seated height (1.60mm), which is compatible with designs accommodating the FN4000157's 1.80mm maximum height.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are ROHS3 compliant and carry EAR99 ECCN classification. No compliance or certification differences exist between the two oscillators.

Q: What is the significance of the different maximum seated heights?

A: The SXO75C3A271-40.000M's 1.60mm maximum height is lower than the FN4000157's 1.80mm. This difference is within typical PCB assembly tolerances and does not affect electrical performance. The lower height may provide additional clearance in designs with tight vertical constraints.

Q: Are both parts available in the same packaging format?

A: Yes. Both oscillators are supplied in 4-SMD, No Lead surface mount packages with identical footprint dimensions (7.00mm L x 5.00mm W), ensuring compatibility with the same PCB layout and assembly processes.

Q: What parameters must remain constant when substituting these oscillators?

A: Frequency (40 MHz), output type (CMOS), supply voltage (3.3V), enable/disable function, frequency stability (±50ppm), operating temperature range (-20°C to 70°C), and maximum supply current (25mA) must all remain constant. Package type and dimensions must also match exactly.