DT-400 Silicon Diodes - Technical Specifications

Home > Products > Cryogenic Temperature Sensors > Silicon Diodes > DT-400

DT-400 Series Silicon Diodes

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-SD	1.4 K	500 K
DT-471-SD	10 K	500 K
DT-414	1.4 K	375 K
DT-421	1.4 K	325 K

Calibrated Accuracy

	Typical sensor accuracy²	Long-term stability³
1.4 K	±12 mK	—
4.2 K	±12 mK	10 mK
10 K	±12 mK	—
77 K	±22 mK	40 mk
300 K	±32 mK	25 mk
500 K	±50 mK	——

²[(Calibration uncertainty)² + (reproducibility)²] ^0.5 for more information see Appendices B, D, and E
³ Long-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 K	60 K to 345 K	345 K to 375 K	375 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

Type	1.4 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 greater		Not recommended

Type	20 K to 325 K
DT-421	±2.5 K or ±1.5% of temp, whichever is greater

Temperature Response Data Table

	*DT-470/471/ 414**		DT-421
	V (volts)	dV/dT (mV/K)	V (volts)	dV/dT (mV/K)
1.4	1.698	-13.1	—	—
4.2	1.626	-33.6	1.789	-36
10	1.42	-28.7	—	—
77	1.0203	-1.75	1.02	2
305	0.507	-2.4	0.507	-2.4
Click here for expanded response table *DT-471 minimum temperature: 10 K

Physical Specifications
	Mass	Lead type	Lead polarity	Sensor materials used
DT-470/ 471-SD	37 mg	2 – gold and nickel plated Kovar	Positive lead on right with package lip 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 – gold	Positive lead onleft 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 Errors⁴ ΔT/T (%) at B (magnetic induction)

Package Base Parallel to Field B
T(K)	1 T	2 T	3 T	4 T	5 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 T	3 T	4 T	5 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	0.2	0.5	0.6	0.6
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

DT-400 Series Curve 10 Temperature Response Curve	Standard Curve 10 Tolerance Bands for DT-470/471 Silicon Diodes

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)
1.40	1.69812	-13.1
1.60	1.69521	-15.9
1.80	1.69177	-18.4
2.00	1.68786	-20.7
2.20	1.68352	-22.7
2.40	1.67880	-24.4
2.60	1.67376	-25.9
2.80	1.66845	-27.1
3.00	1.66292	-28.1
3.20	1.65721	-29.0
3.40	1.65134	-29.8
3.60	1.64529	-30.7
3.80	1.63905	-31.6
4.00	1.63263	-32.7
4.20	1.62602	-33.6
4.40	1.61920	-34.6
4.60	1.61220	-35.4
4.80	1.60506	-36.0
5.00	1.59782	-36.5
5.50	1.57928	-37.6
6.00	1.56027	-38.4
6.50	1.54097	-38.7
7.00	1.52166	-38.4
7.50	1.50272	-37.3
8.00	1.48443	-35.8
8.50	1.46700	-34.0
9.00	1.45048	-32.1
9.50	1.43488	-30.3
10.0	1.42013	-28.7
10.5	1.40615	-27.2
11.0	1.39287	-25.9

T (K)	Voltage (V)	dV/dT (mV/K)
11.5	1.38021	-24.8
12.0	1.36809	-23.7
12.5	1.35647	-22.8
13.0	1.34530	-21.9
13.5	1.33453	-21.2
14.0	1.32412	-20.5
14.5	1.31403	-19.9
15.0	1.30422	-19.4
15.5	1.29464	-18.9
16.0	1.28527	-18.6
16.5	1.27607	-18.2
17.0	1.26702	-18.0
17.5	1.25810	-17.7
18.0	1.24928	-17.6
18.5	1.24053	-17.4
19.0	1.23184	-17.4
19.5	1.22314	-17.4
20.0	1.21440	-17.6
21.0	1.19645	-18.5
22.0	1.17705	-20.6
23.0	1.15558	-21.7
24.0	1.13598	-15.9
25.0	1.12463	-7.72
26.0	1.11896	-4.34
27.0	1.11517	-3.34
28.0	1.11212	-2.82
29.0	1.10945	-2.53
30.0	1.10702	-2.34
32.0	1.10263	-2.08
34.0	1.09864	-1.92
36.0	1.09490	-1.83

T (K)	Voltage (V)	dV/dT (mV/K)
38.0	1.09131	-1.77
40.0	1.08781	-1.74
42.0	1.08436	-1.72
44.0	1.08093	-1.72
46.0	1.07748	-1.73
48.0	1.07402	-1.74
50.0	1.07053	-1.75
52.0	1.06700	-1.77
54.0	1.06346	-1.78
56.0	1.05988	-1.79
58.0	1.05629	-1.80
60.0	1.05267	-1.81
65.0	1.04353	-1.84
70.0	1.03425	-1.87
75.0	1.02482	-1.91
77.35	1.02032	-1.92
80.0	1.01525	-1.93
85.0	1.00552	-1.96
90.0	0.99565	-1.99
95.0	0.98564	-2.02
100.0	0.97550	-2.04
110.0	0.95487	-2.08
120.0	0.93383	-2.12
130.0	0.91243	-2.16
140.0	0.89072	-2.19
150.0	0.86873	-2.21
160.0	0.84650	-2.24
170.0	0.82404	-2.26
180.0	0.80138	-2.28
190.0	0.77855	-2.29
200.0	0.75554	-2.31

T (K)	Voltage (V)	dV/dT (mV/K)
210.0	0.73238	-2.32
220.0	0.70908	-2.34
230.0	0.68564	-2.35