ISM95-1251AH-4.000MHZ

Oscillators Overview

The ISM95-1251AH-4.000MHZ is a standard CMOS crystal oscillator manufactured by ILSI, operating at a fixed frequency of 4 MHz. It utilizes a 4-SMD, No Lead package for surface-mount integration. The device supports a supply voltage range of 1.8V to 3.3V and features an enable/disable control pin for power management. Output waveform is CMOS with a duty cycle of approximately 50%. Frequency stability is specified at ±50 ppm over the commercial temperature range of -20°C to +70°C. Initial frequency tolerance is ±25 ppm at 25°C.

Oscillators Feature Summary

• Integrated enable/disable functionality for active power management
• CMOS output signal compatible with digital logic interfaces
• Compact surface-mount package design for automated assembly

Oscillators Applications

• Consumer electronics timing circuits
• Industrial control system clocks
• Communication module synchronization

Oscillators Procurement Notes

Verify the specific suffix configuration against the manufacturer datasheet to ensure compatibility with required voltage levels and enable pin logic. Confirm that the 4-SMD no-lead package footprint matches the target PCB layout. Check for RoHS compliance documentation if environmental regulations apply to the end product. Ensure the operating temperature range meets the deployment environment requirements.

Oscillators Selection Notes

Select this component when a low-power, enable-controlled clock source is required for 4 MHz applications. The CMOS output is suitable for direct interfacing with microcontrollers or FPGA inputs without additional buffering. Consider the ±50 ppm stability specification against system jitter requirements. Evaluate the 1.8V to 3.3V supply range against available board power rails.

Oscillators Part Context

This part belongs to the ISM95 series of standard oscillators from ILSI. The series offers various frequencies and packages. The AH suffix typically denotes specific voltage and enable configurations within the family. This model represents a fixed-frequency solution rather than a programmable variant.

Oscillators Replacement Considerations

Cross-reference with other ISM95 series variants for different frequencies or packages. Verify pinout compatibility before substituting with similar oscillators from other manufacturers. Ensure electrical parameters such as drive level and load capacitance match the original design intent.