STDT Series
Applications
Automotive electronics
Measurement of cooling
water and oil temperature
Features
Thermistor disk with lapped,
coplanar front surfaces
Front surfaces silver-plated
For clamp contacting
Options
Alternative resistance ratings
Custom Specifications
Rated temperatures and tolerances
Type of Lead (Options available on request)
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Lower Temperature : -40°C
Upper Temperature : 140°C
*Max Permissible Current at 25°C : 9 -60mAmp
Resistance Tolerance (ΔR/RN ) : ±5%
Rated Temperature (TN) : 25°C
Beta Tolerance (Δβ/βN) : ±3%
Dissipation factor in air(δth) : approx 1-5 mW/K
Thermal cooling time constant in air (τc) : 3-5s
Heat capacity (Cth) : approx 10-50 mJ/K
Thermal Response time : 10-15 s
Type of Lead (Options available on request)
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*Max permissible current may depend upon
thermistor diameter
Nominal Resistance, RN Specified at 25°C
Reliability Data
| Test | Standard | Test Conditions | Change in R25 (ΔR25/R25) | Remarks |
| Storage in dry heat | IEC 68-2-2 | Storage at upper category temperature T: 140 °C t: 500 h | < 2% | No visible damage |
| Storage in damp heat, steady state | IEC 68 – 2- 3 | Temperature of air:40 °C Relative humidity of air: 93 % Duration: 56 days | < 2% | No visible damage |
| Rapid temperature cycling | IEC 68 – 2- 14 | Lower test temperature:– 55 °C Upper test temperature: 155 °C Number of cycles: 5 | < 2% | No visible damage |
| Long-term stability (empirical value) | Temperature: + 100°C Duration: 2000 h | < 2% | No visible damage |
Part Number Identification
| Product Series Code | Resistance at 25°C | Resistance Tolerance | Beta(β) Constant | Diameter of Disc |
| STDT | 102 | R5 | 3930 | D5 |
| Disc Type NTC Thermistor | 10 x 102Ω (1 kΩ) | ±5% | Beta(β) Value = 3930K | Diameter of Disc 5mm |
Range Of Products
| Diameter | Beta(β) Constant | Resistance at 25°C | Available Resistance tolerances |
| 3 mm (2.65mm & 2.95 mm disc diameter) |
4000 |
10 kΩ |
±3%, ±5%, ±10% etc |
|
4000 |
5 kΩ |
||
|
3900 |
3 kΩ |
||
|
3800 |
2.7 kΩ | ||
|
3720 |
1700 Ω |
||
|
3560 |
1500 Ω |
||
|
3400 |
1000 Ω |
||
| 4 mm (4.15 mm disc diameter) |
3720 |
1500 Ω |
|
|
3720 |
680 Ω |
||
|
3820 |
900 Ω |
||
|
3900 |
2500 Ω |
||
|
2950 |
500 Ω |
||
| 5 mm Disc (4.85 mm, 5.15mm & 5.35 mm disc diameter) |
4300 |
10 kΩ |
|
|
4100 |
2.5 kΩ | ||
|
4100 |
2 kΩ |
||
|
3930 |
1 kΩ |
||
|
3900 |
1 kΩ |
||
|
3900 |
2 kΩ |
||
|
3880 |
1 kΩ |
||
|
3850 |
1 kΩ |
||
|
3820 |
1 kΩ |
||
|
3800 |
1 kΩ |
||
|
3770 |
800 Ω |
||
|
3740 |
500 Ω |
||
|
3740 |
600 Ω |
||
|
3720 |
500 Ω |
||
|
3720 |
470 Ω |
||
|
3700 |
430 Ω |
||
|
3700 |
350 Ω |
||
|
3670 |
300 Ω |
||
|
3645 |
300 Ω |
||
|
3621 |
300 Ω |
||
|
3576 |
300 Ω |
||
|
3553 |
200 Ω |
||
|
3530 |
200 Ω |
||
|
3500 |
200 Ω |
||
|
3480 |
200 Ω |
||
|
3450 |
200 Ω |
||
|
3400 |
200 Ω |
||
|
3260 |
100 Ω |
* Resistance values of each diameter shown in table are our regular supply products. Other values are also available upon customer requirement. Minimum thickness of disc will be 1mm and shall be extended upto 3mm according to specifications.
STDT *** R# &&&& D@
*** = Resistance Value at 25°C (eg: 102- 1000Ω, 201 – 200Ω, 103 – 10kΩ)
# = Resistance Tolerance (eg: R1 – ± 1%, R5 – ±5%)
&&&& = Beta Value (eg:3977K, 3830K)
@ = Disc Diameter (eg: D5 – 5mm Disc, D3 – 3mm Disc)
