The glass-sealed thermistor is a thermistor sealed with heat-insulating glass. Because the glass is insulated, the thermistor is not affected by additional temperature, which greatly improves the sensitivity and accuracy of the control. The glass sealed thermistor looks like this:
Thermistors are a class of sensitive components. According to the different temperature coefficient, it is divided into positive temperature coefficient thermistor and negative temperature coefficient thermistor. The typical characteristic of a thermistor is that it is sensitive to temperature and exhibits different resistance values at different temperatures. Positive temperature coefficient thermistors have higher resistance values at higher temperatures, and negative temperature coefficient thermistors have lower resistance values at higher temperatures. They both belong to semiconductor devices.

What Is Glass Sealing Thermistor
Glass thermistor is a glass-sealed thermistor. Common glass sealing thermistor are: single-ended glass thermistor, diode glass seal, SMD glass seal. Because of the glass insulation, the thermistor is not affected by the additional temperature, greatly improving the sensitivity and accuracy of the control.

Glass Sealed Thermistor Characteristics
High interchange accuracy
Excellent solderability and thermal shock resistance
Wide operating temperature range
Excellent moisture resistance
Low loss, small size
Automated mass production to ensure that the products of high quality and high stability

Composition Structure And Production Process
1> single-ended glass seal: thermistor chip and copper wire welding, use a bead-like glass case package. Single-ended glass-type products are the smallest thermistor.
● lead package allows for manual or machine is mounted;
● Packing: 1000 pcs / bag;
● Dissipation factor: ≥2mW / ℃ (in still air)
● Thermal time constant: ≤ 20S (in still air)
● Rated power: ≤ 50mW
● Note: When installing the product, two wire can not touch.
Probe size selection table:

model	D	L1max	L2		d±0.05
MF51-2.80	2.80±0.20	4.40	30±5	50±5	0.28
MF51-1.80	1.80±0.20	3.80	30±5	50±5	0.23
MF51-1.50	1.5±0.20	2.00	30±5	50±5	0.21
MF51-1.25	1.25±0.20	1.80	30±5	50±5	0.21
MF51-1.20	1.20±0.20	1.80	30±5	50±5	0.21
MF51-0.70	0.70±0.20	1.20	30±5	50±5	0.15
Another :Dmax=0.90mm,Dmax=1.75mm,Dmax=1.95mm product

model	Nominal resistance value		B value			D	Operating temperature
	R25 （KΩ）	Accuracy	（25/50℃）	Specific B value	Accuracy	mm	（℃）
			（K）
MF51-104□3950FA-0.9	100	F：±1％ G：±2％ H：±3％ J：±5％	3950		F：±1％ G： ±2％ H： ±3％ J： ±5％	0.9	-55～300
MF51-103□3380FA-□.□□	10		3380			□.□□
MF51-103□3435FB-□.□□	10			B25/85=3435		□.□□
MF51-103□3950FA-□.□□	10		3950			□.□□
MF51-103□3470FA-□.□□	10		3470			□.□□
MF51-503□3950FA-□.□□	50		3950			□.□□
MF51-104□3950FA-□.□□	100		3950			□.□□
MF51-104□4200FA-□.□□	100		4200			□.□□
MF51-105H4608GA-□.□□	1000		4608			□.□□
MF51-503.485K□3400FA-□.□□	503.485		3400			□.□□
MF51-502□3950FA-□.□□	5		3940			□.□□
MF51-103□3380FA-□.□□	10		3380			□.□□
MF51-103□3435FB-□.□□	10			B25/85=3435		□.□□
MF51-103□3950FA-□.□□	10		3950			□.□□
MF51-503□3950FA-□.□□	50		3950			□.□□
MF51-503□4050FA-□.□□	50		4050			□.□□
MF51-96.5K□3950FA-□.□□	96.5		3950			□.□□
MF51-96.5K□4200FA-□.□□	96.5		4200			□.□□
MF51-104□3950FA-□.□□	100		3950			□.□□
MF51-104□4200FA-□.□□	100		4200			□.□□
MF51-104□4320FA-□.□□	100		4320			□.□□
MF51-103.9K□3951FA-□.□□	103.9		3951			□.□□
MF51-103.9K□4200FA-□.□□	103.9		4200			□.□□
MF51-204□3899FA-□.□□	200		3899			□.□□
MF51-224□4130FA-□.□□	220		4130			□.□□
MF51-234□4537FX-□.□□	230			B100/200=4537		□.□□
MF51-105□4608FB-□.□□	1000			B25/85=4608		□.□□
MF51-1.388M□4600FA-□.□□	1388		4600			□.□□

 
2> axial thermal resistance of glass sealed diode ordinary diode appearance and the same size, is the most widely used resistance temperature detector, product structure is simple, low prices.
Axial Leaded Glass Thermistors
● lead glass seal facilitates installation by hand or machine;
● Packing: 500 pcs / bag or braid;
● Dissipation factor: ≥2mW / ℃ (in still air)
● Thermal time constant: ≤ 20S (in still air)
● Rated power: ≤ 50mW
Composition structure: two symmetric wires (tin-lead), a diode glass envelope, the intermediate seal chip thermistor.
Product model number table:


SMD glass sealed thermistor: Temperature measurement convenient panel mounted thermistor, thermistor chip completely isolated from the outside world, electrical performance is extremely stable and reliable.
● easy to patch installation. There are two specifications, for selection;
●Model: B1 (L = 3.6mm, D = 1.5mm) B2 (L = 1.8mm D = 1.1mm)
● Packing: 4000 pcs / bag or braid;
● Dissipation factor: B1 ≥ 2mW / ℃ B2 ≥ 1mW / ℃ (in still air)
● Thermal time constant: B1 ≤ 10S B2 ≤ 5S (in still air)
● Rated power: B1 ≤ 10mW B2 ≤ 5mW
Composition structure: two ends are tin-plated steel electrode fixed, tubular glass shell sealed copper clad nickel wire, the middle is the thermistor chip. The entire production line using automatic machinery production, a good product to a good.

model	Nominal resistance value		B value			Operating temperature	Operating temperature	Dissipation factor	Hot time constant
	R25 （KΩ）	Accuracy	（K）	Specific B value	Accuracy		（℃）
MF58□202□3839□X(5/25)	2	±1％ ±2％ ±3％ ±5％		B5/25= 3839	±0.5％ ±1％ ±2％	R5=5.06KΩ	-40～350
MF58□202□3771□X(-18/25)	2			B-18/25= 3771		R-18=16.9KΩ
MF58□5.369K□3480□B	5.369			B25/85= 3480
MF58□103□3975□B	10		3975
MF58□233□4200□A	23		4200
MF58□40.27K□3979□B	40.27			B25/85= 3979
MF58□49.12K□3970□X(0/100)	49.12			B0/100= 3970		R100=3.3KΩ
MF58□503□4050□A	50		4050
MF58□98.75K□4300□X(100/200)	98.75			B100/200= 4300		R200=0.55KΩ
MF58□98.63K□4300□X(100/200)	98.63			B100/200= 4300		R200=0.55KΩ
MF58□104□3899□A	200		3899			R160=1.50KΩ
MF58□104□3930□A	100		3930
MF58□104□3990□A	100		3990
MF58□175T2.109K□3899□A			3899			R175=2.109KΩ
MF58□204□3899□A	200		3899			R160=3.0KΩ
MF58□231.5K□4537□X(100/200)	231.5		4537			R200=1.0KΩ
MF58□1.388M□4500□A	1388		4500			R200=4.0KΩ

 Application
1, copier, printer office appliances
2, curlers, grill cover, hair dryer and other beauty equipment
3, inverter fan, iron, water heater, oven, hood and other household appliances temperature sensor
4, the car brake system, micro-motors, flow meters and other small space and high temperature requirements, or short response time of the occasion,
5, fire warning system
6, can replace the PSB-S1, PSB-S3 (PT-51F, PT-25E2, PT-312, PM-342, PM-382, PB-43, PB-41E) series