Power type Nanjing Shiheng Elec MF72 33D7 NTC thermistor for surge current suppression applications

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Product Description

Product Overview

The MF72 series of power-type NTC thermistors from Nanjing Shiheng Electronics Technology Co., Ltd. are designed for surge current suppression. These thermistors offer reliable performance with a wide operating temperature range and are manufactured under stringent quality management systems. They are suitable for applications requiring protection against inrush current.

Product Attributes

Brand: Shiheng
Product Type: Power Type NTC Thermistor
Origin: Nanjing, China
Encapsulation Material: Black phenolic resin
Lead Material: Tinned copper wire
Certifications: ISO9001:2008, ISO/TS16949:2009, ISO14001:2004, RoHS, CQC Safety Certification, Jiangsu High-tech Product Certification, TUV

Technical Specifications

Item	Symbol	Test Conditions	Unit	Performance Requirements
Zero-power resistance at 25	R25	Ta=250.5, Test Power 0.1mW, Tested in air		33 20%
B Value	B25/50	B=[(TaTb)/(Tb-Ta)]ln(Ra/Rb)	K	2800 10%
Max. Steady Current	I max		A	0.5
Max. Allowable Capacitance	CT	240Vac	F	47
Dissipation Factor			mW/	10
Thermal Time Constant			sec	28
Withstand Voltage		500V/AC, 1min		No breakdown or flashover
Insulation Resistance		500V/DC, 1min	M	500
Operating Temperature Range				-40 ~ 130
Max. Rated Power	Pmax		W	1
Lead Strength (Tensile)		101 sec	N	10 (for 0.5
Lead Strength (No visible damage)				R/R25%
Solderability		Temperature 2455, Time 2-3 sec		95% tinned area
Resistance to Soldering Heat		Solder pot temperature: 2605, Immersion depth 6mm from body, Time 101 sec		R/R25%
Steady State Damp Heat		Temperature: 402, Humidity: 932%, Time: 500 hours		R/R25%
Temperature Cycling		-40 30min25 5min130 30min25 5min, 5 cycles		R/R25%
High Temperature Storage		Temperature: 1305, Time: 1000 hours		R/R25%
Max. Steady Current Durability		Continuous application of max. steady current at room temperature for 50024h		R/R25%
Max. Capacitance Endurance		Apply max. allowable capacitance, 50ms on, 5 times thermal time constant off, 1000 cycles		R/R25%

Model	Description
MF72-33D7	Power Type NTC Thermistor, 33 (at 25 zero-power resistance), D7 (body diameter)

Dimension	L1	L2	F1	F2	T	d
(Unit: mm)	Min 17	5 2	5 1	3 1.5	Max 5	0.6 0.05

Usage Notes

Primary Use: Surge current suppression.
Soldering: Keep soldering point at least 2mm from the coating layer. Soldering temperature below 360, soldering time less than 3 seconds.
Storage Temperature: -1040.
Storage Humidity: 75% RH.
Storage Environment: Avoid storage in environments with corrosive gases and direct sunlight.
Packaging: Reseal packaging after opening.
Shelf Life: 1 year.