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FN2500157 Equivalent & Substitute Parts
Part Overview
The FN2500157 is a 25 MHz XO (Standard) CMOS oscillator manufactured by Diodes Incorporated, part of the SaRonix-eCera™ FN series. This surface mount crystal oscillator operates at 2.5V with enable/disable functionality and is designed for applications requiring stable frequency generation in compact form factors. The device is Active status and widely used in digital signal processing, telecommunications, and consumer electronics. Substitute parts may be required due to inventory constraints, design revisions, or application-specific parameter requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Frequency | 25 MHz |
| Output Type | CMOS |
| Supply Voltage | 2.5V |
| Function | Enable/Disable |
| Package Type | 4-SMD, No Lead |
| Mounting Type | Surface Mount |
| Physical Dimensions | 7.00mm x 5.00mm x 1.80mm (max height) |
| RoHS Compliance | ROHS3 Compliant |
| Moisture Sensitivity Level | MSL 1 (Unlimited) |
Substitute Part Grouping Explanation
The FN2500155 qualifies as a direct substitute for the FN2500157 based on the following critical parameters:
- Frequency Match: Both operate at 25 MHz
- Output Configuration: Both provide CMOS output
- Supply Voltage: Both require 2.5V operation
- Enable/Disable Function: Both include this control feature
- Package Compatibility: Identical 4-SMD, No Lead package with matching physical dimensions (7.00mm x 5.00mm)
- Mounting Type: Both are surface mount devices
- Compliance Standards: Both are ROHS3 compliant and REACH unaffected
- Moisture Sensitivity: Both rated MSL 1 (Unlimited)
The FN2500155 differs in frequency stability specification and operating temperature range, which may affect suitability depending on application requirements.
Parameter Comparison
| Parameter | FN2500157 (Main) | FN2500155 (Substitute) |
|---|---|---|
| Manufacturer | Diodes Incorporated | Diodes Incorporated |
| Frequency | 25 MHz | 25 MHz |
| Output Type | CMOS | CMOS |
| Supply Voltage | 2.5V | 2.5V |
| Function | Enable/Disable | Enable/Disable |
| Frequency Stability | ±50ppm | ±25ppm |
| Operating Temperature Range | -40°C ~ 85°C | -20°C ~ 70°C |
| Current - Supply (Max) | 15mA | 15mA |
| Current - Supply (Disable) (Max) | 10µA | 10µA |
| Package / Case | 4-SMD, No Lead | 4-SMD, No Lead |
| Physical Dimensions | 7.00mm x 5.00mm | 7.00mm x 5.00mm |
| Height - Seated (Max) | 1.80mm | 1.80mm |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level | MSL 1 (Unlimited) | MSL 1 (Unlimited) |
| REACH Status | REACH Unaffected | REACH Unaffected |
Engineering Selection Recommendations
Both the FN2500157 and FN2500155 are Active status products from Diodes Incorporated with identical ROHS3 and REACH compliance certifications. Selection between these parts should be based on application-specific operating conditions:
The FN2500157 supports an extended operating temperature range (-40°C to 85°C) and provides ±50ppm frequency stability, making it suitable for industrial and automotive applications with wider temperature extremes.
The FN2500155 operates within a narrower temperature range (-20°C to 70°C) with tighter frequency stability (±25ppm), positioning it for consumer and commercial applications where temperature variation is limited and frequency precision is prioritized.
Both devices maintain identical electrical performance in supply current, output configuration, and package footprint, ensuring direct PCB compatibility when thermal and frequency stability requirements align with the selected part's specifications.
Frequently Asked Questions (FAQ)
Q: Can FN2500155 replace FN2500157 in all applications?
A: Direct substitution is possible only when the application's operating temperature range falls within -20°C to 70°C and the ±25ppm frequency stability meets system requirements. Applications requiring operation below -20°C or above 70°C must use the FN2500157.
Q: What is the significance of frequency stability difference (±50ppm vs ±25ppm)?
A: Frequency stability defines the maximum deviation from the nominal 25 MHz center frequency across operating conditions. The FN2500155's tighter ±25ppm specification provides superior frequency accuracy, beneficial for precision timing applications. The FN2500157's ±50ppm specification is acceptable for general-purpose timing where broader tolerance is permissible.
Q: Are the physical packages identical?
A: Yes. Both parts use the 4-SMD, No Lead package with identical dimensions (7.00mm x 5.00mm) and maximum seated height (1.80mm), ensuring identical PCB footprint and assembly compatibility.
Q: Do both parts support enable/disable functionality?
A: Yes. Both the FN2500157 and FN2500155 include enable/disable control, allowing dynamic power management by reducing supply current to 10µA maximum in disabled state.
Q: Are there compliance differences between these parts?
A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating, meeting identical regulatory and environmental standards.
Q: What is the maximum supply current for both devices?
A: Both parts draw a maximum of 15mA during normal operation and 10µA maximum when disabled, providing identical power consumption characteristics.
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