Please note: The DT-470 Series silicon diodes have been discontinued. Our recommended replacements are the DT-670 silicon diodes.

400 Series Silicon Diode Specifications

Standard curve Curve 10

Recommended excitation 10 µA ±0.1%

Max reverse voltage 40 V

Max current before damage 1 mA continuous or 100 mA pulsed

Dissipation at recommended excitation

17µW at 4.2 K; 10 µW at 77 K; 5 µW at 305 K

Thermal response time SD: typical <10 ms at 4.2 K; 100 ms at 77 K, 200 ms at 305 K

Use in radiation Recommended for use only in low level radiation – for more information click here

Use in magnetic field

Not recommended for use in magnetic field applications below 60 K. Low magnetic field dependence when used in fields up to 5 tesla above 60 K – for more information click here

Reproducibility1 ±10 mK at 4.2 K

1 Short-term reproducibility data is obtained by subjecting sensor to repeated thermal shocks from 305 K to 4.2 K

Range of use

 Minimum limit Maximum limit
DT-470-SD1.4 K500 K
DT-471-SD10 K500 K
DT-4141.4 K375 K
DT-4211.4 K325 K

Calibrated accuracy

 Typical sensor accuracy2Long-term stability3
1.4 K ±12 mK —
4.2 K ±12 mK10 mK
10 K ±12 mK—
77 K ±22 mK40 mk
300 K ±32 mK25 mk
500 K±50 mK——

2[(Calibration uncertainty)2 + (reproducibility)2]0.5 — for more information see Appendices B, D, and E
3Long-term stability data is obtained by subjecting sensor to 200 thermal shocks from 305 K to 77 K

SoftCal™ accuracy

 2 K to 30 K 30 K to 60 K60 K to 345 K345 K to 375 K375 K to 475 K
2S—±0.25 K±0.15 K±0.25 K±1.0 K
3S ±0.5 K±0.25 K±0.15 K±0.25 K±1.0 K

2S: 77 K and 305 K (DT-470-SD, DT-471-SD, and DT-421). DT-421 SoftCal has a low end temperature limited to 40 K
3S: 4.2 K, 77 K, and 305 K (DT-470-SD only)

Standard Curve 10 tolerance bands for DT-400 Series silicon diodes

Type 470 2 K to 100 K 100 K to 305 K 305 K to 475 K
Band 11±0.25 K ±0.5 K±1.0 K
Band 11A ±0.25 K±1% of temp ±1% of temp
Band 12 ±0.5 K±1.0 K±2.0 K
Band 12A ±0.5 K±1% of temp±1% of temp
Band 13 ±1.0 K±1% of temp±1% of temp
Type1.4 K to 10 K 10 K to 375 K 375 K to 475 K
DT-471 Not recommended±1.5 K or ±1.5% of temp, whichever is greater
DT-414 ±1.5 K or ±1.5% of temp, whichever is greaterNot recommended
Type20 K to 325 K
DT-421±2.5 K or ±1.5% of temp, whichever is greater

Temperature response data table

 DT-470/471*/ 414DT-421
 V (volts) dV/dT (mV/K) V (volts)dV/dT (mV/K)
1.4 1.698-13.1——
4.2 1.626-33.61.789-36
10 1.42-28.7——
77 1.0203-1.751.022
305 0.507-2.40.507-2.4

Click here for expanded response table
*DT-471 minimum temperature: 10 K

Physical specifications

 MassLead typeLead polarity Sensor materials used
DT-470/
471-SD
37 mg2 – gold and nickel plated Kovar Positive lead on right with package lid up and leads towards user Sapphire base with alumina body & lid. Molydenum/manganese metallization on base and lid top with nickel and gold plating. Gold tin solder as hermetic seal. Silicon chip with aluminum metallization
DT-414 3 mg 2 – goldPositive lead on left with chip up and leads towards user Alumina base, with metallization: 0.1 µm of molybdenum, 0.2 µm gold
DT-421 23 mg 2 – platinum ribbon with tinned 60/40 SnPb solder Positive lead on right hand ribbon with platinum disk down and leads towards user Sensing element is mounted to a platinum disk and covered with a dome of Stycast® 2850 epoxy

Typical magnetic field-dependent temperature errors4Δ T/T (%) at B (magnetic induction)

Package base parallel to field B
T(K)1 T 2 T3 T4 T5 T
4.2-200-300-350-400-500
20-10-20-25-30-40
40-4-6-8-10-12
60-0.5-1-2-3-3.5
80< 0.1 -0.5-0.8-1.1-1.5
300< -0.1 < -0.1 < -0.1 < -0.1 < -0.1
Package base perpendicular to field B
T(K)1 T 2 T3 T4 T5 T
4.2-8-9-11-15-20
20-4-5-5-5-10
40-1.5-3-4-5-5.5
60-0.5-0.7-0.8-1-1.1
80-0.1-0.3-0.5-0.6-0.7
300< 0.1 0.20.50.60.6

4 To minimize magnetic field-induced temperature errors, the sensor should be oriented so that the package base is perpendicular to the magnetic field flux lines — this results in the diode current being parallel to the magnetic field

Click to Enlarge

Click to Enlarge

Click to Enlarge

DT-400 Series expanded temperature response data table

All DT-470, DT-471*, DT-414*, and DT-421* silicon diodes follow the same Curve 10 standard temperature response curve, which means they can be interchanged with one another routinely in any application utilizing this response curve.

T
(K)		Voltage
(V) 		dV/dT
(mV/K)
1.401.69812-13.1
1.601.69521-15.9
1.801.69177-18.4
2.001.68786-20.7
2.201.68352-22.7
2.401.67880-24.4
2.601.67376-25.9
2.801.66845-27.1
3.001.66292-28.1
3.201.65721-29.0
3.401.65134-29.8
3.601.64529-30.7
3.801.63905-31.6
4.001.63263-32.7
4.201.62602-33.6
4.401.61920-34.6
4.601.61220-35.4
4.801.60506-36.0
5.001.59782-36.5
5.501.57928-37.6
6.001.56027-38.4
6.501.54097-38.7
7.001.52166-38.4
7.501.50272-37.3
8.001.48443-35.8
8.501.46700-34.0
9.001.45048-32.1
9.501.43488-30.3
10.01.42013-28.7
10.51.40615-27.2
11.01.39287-25.9
T
(K)		Voltage
(V) 		dV/dT
(mV/K)
11.51.38021-24.8
12.01.36809-23.7
12.51.35647-22.8
13.01.34530-21.9
13.51.33453-21.2
14.01.32412-20.5
14.51.31403-19.9
15.01.30422-19.4
15.51.29464-18.9
16.01.28527-18.6
16.51.27607-18.2
17.01.26702-18.0
17.51.25810-17.7
18.01.24928-17.6
18.51.24053-17.4
19.01.23184-17.4
19.51.22314-17.4
20.01.21440-17.6
21.01.19645-18.5
22.01.17705-20.6
23.01.15558-21.7
24.01.13598-15.9
25.01.12463-7.72
26.01.11896-4.34
27.01.11517-3.34
28.01.11212-2.82
29.01.10945-2.53
30.01.10702-2.34
32.01.10263-2.08
34.01.09864-1.92
36.01.09490-1.83
T
(K)		Voltage
(V) 		dV/dT
(mV/K)
38.01.09131-1.77
40.01.08781-1.74
42.01.08436-1.72
44.01.08093-1.72
46.01.07748-1.73
48.01.07402-1.74
50.01.07053-1.75
52.01.06700-1.77
54.01.06346-1.78
56.01.05988-1.79
58.01.05629-1.80
60.01.05267-1.81
65.01.04353-1.84
70.01.03425-1.87
75.01.02482-1.91
77.351.02032-1.92
80.01.01525-1.93
85.01.00552-1.96
90.00.99565-1.99
95.00.98564-2.02
100.00.97550-2.04
110.00.95487-2.08
120.00.93383-2.12
130.00.91243-2.16
140.00.89072-2.19
150.00.86873-2.21
160.00.84650-2.24
170.00.82404-2.26
180.00.80138-2.28
190.00.77855-2.29
200.00.75554-2.31
T
(K)		Voltage
(V) 		dV/dT
(mV/K)
210.00.73238-2.32
220.00.70908-2.34
230.00.68564-2.35
240.00.66208-2.36
250.00.63841-2.37
260.00.61465-2.38
270.00.59080-2.39
273.150.58327-2.39
280.00.56690-2.39
290.00.54294-2.40
300.00.51892-2.40
305.00.50688-2.41
310.00.49484-2.41
320.00.47069-2.42
330.00.44647-2.42
340.00.42221-2.43
350.00.39783-2.44
360.00.37337-2.45
370.00.34881-2.46
380.00.32416-2.47
390.00.29941-2.48
400.00.27456-2.49
410.00.24963-2.50
420.00.22463-2.50
430.00.19961-2.50
440.00.17464-2.49
450.00.14985-2.46
460.00.12547-2.41
470.00.10191-2.30
475.00.09062-2.22
     *Partial conformances  
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