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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

Package	Minimum limit	Maximum limit
SD, CU-HT², BR	1.4 K	500 K
CU, LR, CY, ET, MT, BO, HR	1.4 K	420 K

² The high-temperature variant of the CU package (CU-HT) requires immersion in liquid cryogen or vapor to achieve the specified performance. Sensors mounted in vacuum may operate with reduced performance close to base temperature due to reduced thermal performance. See package information for more details.

Temperature response data table

	DT-670		DT-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	-31.6	1.678	-35
10 K	1.38	-26.8	—	—
77 K	1.03	-1.73	1.03	-1.73
305 K	0.560	-2.30	0.560	-2.30

Expanded response table

Calibrated accuracy

	Typical sensor accuracy³
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

³ [(Calibration uncertainty)² + (reproducibility)²]^0.5 for more information see Appendices B, D, and E

Long-term stability

	Use to 305 K⁴	Use to 500 K⁵
4.2 K	±10 mK	±40 mK
77 K	±40 mK	±100 mK
305 K	±25 mK	±50 mK
500 K	—	±150 mK

⁴ Long-term stability data is obtained by subjecting sensor to 200 thermal shocks from 305 K to 77 K

⁵ 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 D⁶	±0.25 K	±0.50 K	±0.20% of temp

⁶ 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

	Mass	Lead type	Lead polarity	Sensor materials used
DT-670-SD	37 mg	2 – 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	none	Positive 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 mg	2 – platinum ribbon with tinned 60/40 SnPb solder	Positive lead is 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

Silicon diode calibration ranges

Typical magnetic field-dependent temperature errors⁷ 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

⁷ 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-670 temperature response curve

Curve DT-670 tolerance bands

DT-670 Series expanded temperature response data table

T (K)	Voltage (V)	dV/dT (mV/K)
1.4	1.644290	-12.5
1.5	1.642990	-13.6
1.6	1.641570	-14.8
1.7	1.640030	-16.0
1.8	1.638370	-17.1
1.9	1.636600	-18.3
2.0	1.634720	-19.3
2.1	1.632740	-20.3
2.2	1.630670	-21.1
2.3	1.628520	-21.9
2.4	1.626290	-22.6
2.5	1.624000	-23.2
2.6	1.621660	-23.6
2.7	1.619280	-24.0
2.8	1.616870	-24.2
2.9	1.614450	-24.4
3.0	1.612000	-24.7
3.1	1.609510	-25.1
3.2	1.606970	-25.6
3.3	1.604380	-26.2
3.4	1.601730	-26.8
3.5	1.599020	-27.4
3.6	1.596260	-27.9
3.7	1.59344	-28.4
3.8	1.59057	-29.0
3.9	1.58764	-29.6
4.0	1.58465	-30.2
4.2	1.57848	-31.6
4.4	1.57202	-32.9
4.6	1.56533	-34.0
4.8	1.55845	-34.7
5.0	1.55145	-35.2
5.2	1.54436	-35.6
5.4	1.53721	-35.9
5.6	1.53000	-36.2
5.8	1.52273	-36.5

T (K)	Voltage (V)	dV/dT (mV/K)
6.0	1.51541	-36.7
6.5	1.49698	-36.9
7.0	1.47868	-36.2
7.5	1.46086	-35.0
8.0	1.44374	-33.4
8.5	1.42747	-31.7
9.0	1.41207	-29.9
9.5	1.39751	-28.3
10.0	1.38373	-26.8
10.5	1.37065	-25.5
11.0	1.35820	-24.3
11.5	1.34632	-23.2
12.0	1.33499	-22.1
12.5	1.32416	-21.2
13.0	1.31381	-20.3
13.5	1.30390	-19.4
14.0	1.29439	-18.6
14.5	1.28526	-17.9
15.0	1.27645	-17.3
15.5	1.26794	-16.8
16.0	1.25967	-16.3
16.5	1.25161	-15.9
17.0	1.24372	-15.6
17.5	1.23596	-15.4
18.0	1.22830	-15.3
18.5	1.22070	-15.2
19.0	1.21311	-15.2
19.5	1.20548	-15.3
20.0	1.197748	-15.6
21.0	1.181548	-17.0
22.0	1.162797	-21.1
23.0	1.140817	-20.8
24.0	1.125923	-9.42
25.0	1.119448	-4.60
26.0	1.115658	-3.19
27.0	1.112810	-2.58

T (K)	Voltage (V)	dV/dT (mV/K)
28.0	1.110421	-2.25
29.0	1.108261	-2.08
30.0	1.106244	-1.96
31.0	1.104324	-1.88
32.0	1.102476	-1.82
33.0	1.100681	-1.77
34.0	1.098930	-1.73
35.0	1.097216	-1.70
36.0	1.095534	-1.69
37.0	1.093878	-1.64
38.0	1.092244	-1.62
39.0	1.090627	-1.61
40.0	1.089024	-1.60
42.0	1.085842	-1.59
44.0	1.082669	-1.59
46.0	1.079492	-1.59
48.0	1.076303	-1.60
50.0	1.073099	-1.61
52.0	1.069881	-1.61
54.0	1.066650	-1.62
56.0	1.063403	-1.63
58.0	1.060141	-1.64
60.0	1.056862	-1.64
65.0	1.048584	-1.67
70.0	1.040183	-1.69
75.0	1.031651	-1.72
77.35	1.027594	-1.73
80.0	1.022984	-1.75
85.0	1.014181	-1.77
90.0	1.005244	-1.80
100.0	0.986974	-1.85
110.0	0.968209	-1.90
120.0	0.949000	-1.94
130.0	0.929390	-1.98
140.0	0.909416	-2.01
150.0	0.889114	-2.05

T (K)	Voltage (V)	dV/dT (mV/K)
160.0	0.868518	-2.07
170.0	0.847659	-2.10
180.0	0.826560	-2.12
190.0	0.805242	-2.14
200.0	0.783720	-2.16
210.0	0.762007	-2.18
220.0	0.740115	-2.20
230.0	0.718054	-2.21
240.0	0.695834	-2.23
250.0	0.673462	-2.24
260.0	0.650949	-2.26
270.0	0.628302	-2.27
273.0	0.621141	-2.28
280.0	0.605528	-2.28
290.0	0.582637	-2.29
300.0	0.559639	-2.30
310.0	0.536542	-2.31
320.0	0.513361	-2.32
330.0	0.490106	-2.33
340.0	0.466760	-2.34
350.0	0.443371	-2.34
360.0	0.419960	-2.34
370.0	0.396503	-2.35
380.0	0.373002	-2.35
390.0	0.349453	-2.36
400.0	0.325839	-2.36
410.0	0.302161	-2.37
420.0	0.278416	-2.38
430.0	0.254592	-2.39
440.0	0.230697	-2.39
450.0	0.206758	-2.39
460.0	0.182832	-2.39
470.0	0.159010	-2.37
480.0	0.135480	-2.33
490.0	0.112553	-2.25
500.0	0.090681	-2.12