QT49-27.000MAAJ-B

$0.33

Description：HC49 XTAL 30ppm 30ppm 18pF
Series：QT49
Mfr：QST
Package：Bulk

SKU:e01b35b2a46f Category: Crystals Brand: QST

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Product introduction

Product Detailed Parameters

Description：HC49 XTAL 30ppm 30ppm 18pF
Series：QT49
Mfr：QST
Package：Bulk
Type：MHz Crystal
Frequency：27 MHz
Frequency Stability：±30ppm
Frequency Tolerance：±30ppm
Load Capacitance：18pF
ESR (Equivalent Series Resistance)：30 Ohms
Operating Mode：Fundamental
Operating Temperature：-20°C ~ 70°C
Ratings：-
Mounting Type：Through Hole
Package / Case：HC-49S
Size / Dimension：0.453" L x 0.197" W (11.50mm x 5.00mm)
Height - Seated (Max)：0.145" (3.68mm)

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QT49-27.000MAAJ-B

Overview

The QST QT49-27.000MAAJ-B is a through-hole MHz quartz crystal designed for frequency control applications. It operates at a nominal frequency of 27 MHz with a frequency tolerance and stability of ±30 ppm at 25°C. The component features a load capacitance of 18 pF and an equivalent series resistance (ESR) of 30 Ohms. It utilizes the HC-49S package, measuring 11.5 mm in length, 5 mm in width, and 3.68 mm in height. The device supports base mode operation and is compliant with RoHS3 standards.

Feature Summary

Through-hole mounting configuration utilizing the standard HC-49S package format
Frequency stability maintained within ±30 ppm tolerance at 25°C ambient temperature
Designed for base mode oscillation with a specified load capacitance of 18 pF

Applications

General purpose clock signal generation in digital circuits
Radio frequency transmitter and receiver oscillator stages
Microcontroller system timing references

Procurement Notes

Verify that the target design accommodates through-hole assembly processes, as this component requires PCB holes rather than surface mount pads. Confirm that the circuit layout provides adequate clearance around the HC-49S package dimensions to prevent mechanical interference during installation or housing closure. Ensure the operating environment remains within the specified thermal limits to maintain the stated frequency stability.

Selection Notes

Select this part when a robust, cost-effective through-hole solution is required for 27 MHz timing. It serves as a direct alternative to surface mount crystals if board space allows for larger components. Consider the higher ESR compared to some modern SMD variants when designing the oscillator circuit to ensure reliable startup conditions.

Part Context

This component belongs to the QT49 series from QST, which specializes in standard MHz quartz crystals. The series offers various frequency options and tolerance grades, catering to general electronics manufacturing needs. The HC-49S form factor is widely recognized in legacy and industrial designs for its durability and ease of manual or automated insertion.