1N821 データシートの表示（PDF） - Philips Electronics
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1N821 Datasheet PDF : 5 Pages
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Philips Semiconductors
Voltage reference diodes
Product specification
1N821 to 1N829
1N821A to 1N829A
ELECTRICAL CHARACTERISTICS
Tj = 25 °C unless otherwise specified.
SYMBOL
PARAMETER
Vref
∆Vref
SZ
rdif
reference voltage
reference voltage excursion
1N821; 1N821A
1N823; 1N823A
1N825; 1N825A
1N827; 1N827A
1N829; 1N829A
temperature coefficient
1N821; 1N821A
1N823; 1N823A
1N825; 1N825A
1N827; 1N827A
1N829; 1N829A
differential resistance
1N821 to 1N829
1N821A to 1N829A
CONDITIONS
IZ =7.5 mA
IZ =7.5 mA; test points for
Tamb: −55; +25; +75; +100 °C;
see Fig.2; notes 1 and 2
IZ = 7.5 mA: see Fig.3;
notes 1 and 2
IZ = 7.5 mA; see Fig.4
MIN.
5.89
−
−
−
−
−
−
−
−
−
−
−
−
TYP.
6.20
MAX. UNIT
6.51 V
−
96
mV
−
48
mV
−
19
mV
−
9
mV
−
5
mV
−
0.01 %/K
−
0.005 %/K
−
0.002 %/K
−
0.001 %/K
−
0.0005 %/K
−
15
Ω
−
10
Ω
Notes
1. The quoted values of ∆Vref are based on a constant current IZ. Two factors can cause ∆Vref to change, namely the
differential resistance rdif and the temperature coefficient SZ.
a) As the max. rdif of the device can be 15 Ω, a change of 0.01 mA in the current through the reference diode will
result in a ∆Vref of 0.01 mA × 15 Ω = 0.15 mV. This level of ∆Vref is not significant on a 1N821 (∆Vref < 96 mV),
it is however very significant on a 1N829 (∆Vref < 5 mV).
b) The temperature coefficient of the reference voltage SZ is a function of IZ. Reference diodes are classified at the
specified test current and the SZ of the reference diode will be different at different levels of IZ. The absolute value
of IZ is important, however, the stability of IZ, once the level has been set, is far more significant. This applies
particularly to the 1N829. The effect of the stability of IZ on SZ is shown in Fig.3.
2. All reference diodes are characterized by the ‘box method’. This guarantees a maximum voltage excursion (∆Vref)
over the specified temperature range, at the specified test current (IZ), verified by tests at indicated temperature
points within the range. VZ is measured and recorded at each temperature specified. The ∆Vref between the highest
and lowest values must not exceed the maximum ∆Vref given. Therefore the temperature coefficient is only given as
a reference. It may be derived from: SZ = T----Va---m-r--e-b--f-21----––-----VT----ar--e-m--f-2-b---1 × -V----r-1-e--0f---n0---o--m-- %/K
THERMAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
Rth j-tp
Rth j-a
thermal resistance from junction to tie-point 8 mm from the body
thermal resistance from junction to ambient lead length 10 mm
VALUE
300
375
UNIT
K/W
K/W
1996 Mar 20
3
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