DT-670 Silicon Diode Specifications

General

Standard curve Curve DT-670

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 16 µW at 4.2 K; 10 µW at 77 K; 5 µW at 300 K

Thermal response time SD: typical <10 ms at 4.2 K, 100 ms at 77 K, 200 ms at 305 K; BR: 1 ms at 4.2 K, 13 ms at 77 K, 20 ms at 305 K

Use in radiation Recommended for use only in low level radiation — more information

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 T above 60 K — more information.

Reproducibility1 ±10 mK at 4.2 K

Soldering standard J-STD-001 Class 2

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

Range of use

PackageMinimum limit Maximum limit
SD, CU-HT, BR1.4 K500 K
CU, LR, CY, ET, MT, BO, HR1.4 K420 K

Temperature response data table

 DT-670DT-621-HR
 V (volts) dV/dT (mV/K) V (volts) dV/dT (mV/K)
1.4 K 1.64-12.5——
4.2 K 1.58-31.61.678-35
10 K 1.38-26.8——
77 K 1.03-1.731.03-1.73
305 K 0.560-2.300.560-2.30

Expanded response table

Calibrated accuracy

 Typical sensor accuracy2
1.4 K ±12 mK
4.2 K ±12 mK
10 K ±12 mK
77 K ±22 mK
300 K ±32 mK
500 K±50 mK

2 [(Calibration uncertainty)2 + (reproducibility)2]0.5 for more information see Appendices B, D, and E

Long-term stability

 Use to 305 K3Use to 500 K4
4.2 K ±10 mK±40 mK
77 K ±40 mK±100 mK
305 K ±25 mK±50 mK
500 K —±150 mK

3 Long-term stability data is obtained by subjecting sensor to 200 thermal shocks from 305 K to 77 K

4 Based on 670 h of baking at 500 K

Standard curve DT-670 tolerance bands

 2 K to 100 K 100 K to 305 K 305 K to 500 K
Band A ±0.25 K ±0.5 K±0.5 K
Band A1 ±0.25 K±1.5% of temp±1.5% of temp
Band B ±0.5 K±0.5 K±0.33% of temp
Band B1±0.5 K±1.5% of temp±1.5% of temp
Band C ±1 K±1 K±0.50% of temp
 30 K to 100 K 100 K to 305 K 305 K to 500 K
Band D5 ±0.25 K ±0.50 K±0.20% of temp

5 For T < 30 K ±1.5 K

 2 K to 100 K 100 K to 500 K
DT-670E-BR±1.5 K typical±1.5% of temp typical
 20 K to 325 K
DT-621-HR ±2.5 K or ±1.5% of temp, whichever is greater

Physical specifications

 MassLead typeLead polarity Sensor materials used
DT-670-SD
37 mg2 – nickel and gold plated Kovar Positive lead on right with package lid up and leads towards user Sapphire base with alumina body & lid. Molybdenum/manganese metallization on base and lid top with nickel and gold plating. Gold tin solder as hermetic seal
DT-670E-BR
(bare die) 		72.7 µg nonePositive connection made through bottom of chip; negative connection made on base pad on top of chip Silicon chip with aluminum metallization on chip contacts
DT-621-HR
23 mg2 – platinum ribbon with tinned 60/40 SnPb solderPositive lead is right-hand ribbon with platinum disk down and leads towards userSensing element is mounted to a platinum disk and covered with a dome of Stycast® 2850 epoxy

Silicon diode calibration ranges

silicon-diode-calibrations

Typical magnetic field-dependent temperature errors5 ΔT/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

5 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-SD package
DT-BR package
HR package

DT-670 temperature response curve

dt670_ts_responsecurve

Curve DT-670 tolerance bands

dt670_ts_tolerance_bands

DT-670 Series expanded temperature response data table

T
(K)		Voltage
(V) 		dV/dT
(mV/K)
1.41.644290-12.5
1.51.642990-13.6
1.61.641570-14.8
1.71.640030-16.0
1.81.638370-17.1
1.91.636600-18.3
2.01.634720-19.3
2.11.632740-20.3
2.21.630670-21.1
2.31.628520-21.9
2.41.626290-22.6
2.51.624000-23.2
2.61.621660-23.6
2.71.619280-24.0
2.81.616870-24.2
2.91.614450-24.4
3.01.612000-24.7
3.11.609510-25.1
3.21.606970-25.6
3.31.604380-26.2
3.41.601730-26.8
3.51.599020-27.4
3.61.596260-27.9
3.71.59344-28.4
3.81.59057-29.0
3.91.58764-29.6
4.01.58465-30.2
4.21.57848-31.6
4.41.57202-32.9
4.61.56533-34.0
4.81.55845-34.7
5.01.55145-35.2
5.21.54436-35.6
5.41.53721-35.9
5.61.53000-36.2
5.81.52273-36.5
   
T
(K)		Voltage
(V) 		dV/dT
(mV/K)
6.01.51541-36.7
6.51.49698-36.9
7.01.47868-36.2
7.51.46086-35.0
8.01.44374-33.4
8.51.42747-31.7
9.01.41207-29.9
9.51.39751-28.3
10.01.38373-26.8
10.51.37065-25.5
11.01.35820-24.3
11.51.34632-23.2
12.01.33499-22.1
12.51.32416-21.2
13.01.31381-20.3
13.51.30390-19.4
14.01.29439-18.6
14.51.28526-17.9
15.01.27645-17.3
15.51.26794-16.8
16.01.25967-16.3
16.51.25161-15.9
17.01.24372-15.6
17.51.23596-15.4
18.01.22830-15.3
18.51.22070-15.2
19.01.21311-15.2
19.51.20548-15.3
20.01.197748-15.6
21.01.181548-17.0
22.01.162797-21.1
23.01.140817-20.8
24.01.125923-9.42
25.01.119448-4.60
26.01.115658-3.19
27.01.112810-2.58
   
T
(K)		Voltage
(V) 		dV/dT
(mV/K)
28.01.110421-2.25
29.01.108261-2.08
30.01.106244-1.96
31.01.104324-1.88
32.01.102476-1.82
33.01.100681-1.77
34.01.098930-1.73
35.01.097216-1.70
36.01.095534-1.69
37.01.093878-1.64
38.01.092244-1.62
39.01.090627-1.61
40.01.089024-1.60
42.01.085842-1.59
44.01.082669-1.59
46.01.079492-1.59
48.01.076303-1.60
50.01.073099-1.61
52.01.069881-1.61
54.01.066650-1.62
56.01.063403-1.63
58.01.060141-1.64
60.01.056862-1.64
65.01.048584-1.67
70.01.040183-1.69
75.01.031651-1.72
77.351.027594-1.73
80.01.022984-1.75
85.01.014181-1.77
90.01.005244-1.80
100.00.986974-1.85
110.00.968209-1.90
120.00.949000-1.94
130.00.929390-1.98
140.00.909416-2.01
150.00.889114-2.05
   
T
(K)		Voltage
(V) 		dV/dT
(mV/K)
160.00.868518-2.07
170.00.847659-2.10
180.00.826560-2.12
190.00.805242-2.14
200.00.783720-2.16
210.00.762007-2.18
220.00.740115-2.20
230.00.718054-2.21
240.00.695834-2.23
250.00.673462-2.24
260.00.650949-2.26
270.00.628302-2.27
273.00.621141-2.28
280.00.605528-2.28
290.00.582637-2.29
300.00.559639-2.30
310.00.536542-2.31
320.00.513361-2.32
330.00.490106-2.33
340.00.466760-2.34
350.00.443371-2.34
360.00.419960-2.34
370.00.396503-2.35
380.00.373002-2.35
390.00.349453-2.36
400.00.325839-2.36
410.00.302161-2.37
420.00.278416-2.38
430.00.254592-2.39
440.00.230697-2.39
450.00.206758-2.39
460.00.182832-2.39
470.00.159010-2.37
480.00.135480-2.33
490.00.112553-2.25
500.00.090681-2.12
   
    
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