T4-LDS-0220, Rev. 2 (7/29/13) ©2013 Microsemi Corporation Page 1 of 5
1N821-1 – 1N829A-1
Availa ble on
commercial
versions
6.2 & 6.55 Volt Zener Reference Diodes
Qualified per MIL-PRF-19500/159
*Qualified Levels:
JAN, JANTX,
JANTXV and JANS
(available on some part
numbers)
DESCRIPTION
The popular 1N821-1 – 1N829A-1 series of temperature compensated reference diodes
provides both 6.2 V and 6.55 V nominal voltages and temperature coefficients as low as
0.0005 %/oC at a Zener test current of 7.5 mA. These DO-35 packaged (glass, axial leaded)
reference diodes are optionally available as RoHS compliant. This type of bonded Zener
package construction is also available in JAN, JANTX, JANTXV and JANS military
qualifications where the RoHS compliant “e3” is not an option. Microsemi also offers other
Zener Reference Diode products for a variety of voltages up to 200 V.
DO-35 (DO-204AH)
Package
Also available in:
DO-213AA MELF
(surface mount)
1N821UR-1 – 1N829AUR-1
Important: For the latest information, visit our website http://www.microsemi.com.
FEATURES
• JEDEC registered 1N821 – 1N829 series.
• Zener impedance values of 10 ohms and 15 ohms are available.
• Reference voltage selection of 6.2 V & 6.55 V +/-5% with further tight tolerance options on
commercial at lower voltage . (Excludes 1N826 and 1N828.)
• Temperature compensated.
• Interna l meta llurg ic al bond.
• Double plug cons tr uc tion .
• *JAN, JANTX, JANTXV and JANS qualification per MIL-PRF-19500/159 available on 1N821-1, 823-
1, 825-1, 827-1 and 829-1.
• RoHS compliant versions available (commercial grade only).
APPLICATIONS / BENEFITS
• Provides minimal voltage changes over a broad temperat ure range.
• For instrumentation and other circuit designs requiring a stable voltage reference.
• Maximum temperature coefficient selections available from 0.01 %/ºC to 0.0005 %/ºC.
• Tight reference voltage tolerances of 1%, 2%, 3%, etc, available on commercial with center nominal
value of 6.2 V by special request. (Exclude s 1N826 and 1N 8 28.)
• Flexible axial-lea d mount ing terminals.
• Non-sensitive to ESD per MIL-STD-750 method 1020.
• Typical low capacitance of 100 pF or less.
MAXIMUM RATINGS @ TA = +25 ºC u nless otherwise specified
MSC – Lawrence
6 Lake Street,
Lawrence, MA 01841
1-800-446-1158
Tel: (978) 620-2600
Fax: (978) 689-0803
MSC – Ireland
Gort Road Business Park,
Ennis, Co. Clare, Ireland
Tel: +353 (0) 65 6840044
Fax: +353 (0) 65 6822298
Website:
www.microsemi.com
Parameters/Test Conditions
Symbol
Value
Unit
Junction and Storage temperature
TJ and TSTG
-55 to +175
oC
Power Dissipation (1)
PD
500
mW
Maximum Zener Current
IZM
70
mA
Solder Pad Temperatures at 10 s
TSP
260
oC
Notes: 1. At TL = 25 oC and maximum current IZM of 70 mA. For optimum voltage-temperature stability, IZ = 7.5
mA (less than 50 mW in dissipated power). Derate at 3.33 mW/oC above TA = +25 oC.
T4-LDS-0220, Rev. 2 (7/29/13) ©2013 Microsemi Corporation Page 2 of 5
1N821-1 – 1N829A-1
MECHANICAL and PACKAGING
• CASE: Hermetically sealed glass case. DO-35 (DO -204AH) package.
• TERMINALS: Tin-lead (military) or RoHS compliant annealed matte-tin plating (commercial grade only) so ldera ble per M IL-STD-
750, method 2026.
• MARKING: Part number and cathode band (except double anode 1N822-1 and 1N824-1).
• POLARITY: Reference diode to be operated with the banded end positive with respect to the opposite end.
• TAPE & REEL option: Standard per EIA-296 (add “TR” suffix to part number). Consult factory for quantities.
• WEIGHT: Approximately 0.2 gram s.
• See Package Dimensions on last page.
PART NOMENCLATURE
Applicable to: JAN, JANTX, JANTXV and JANS of 1N821, 1N823, 1N825, 1N827, and 1N829 only:
JAN 1N821 -1
Reliability Level
JAN = JAN Level
JANTX = JANTX Level
JANTXV = JANTXV Level
JANS = JANS Level
Blank = Commercial
Metallurgical Bond
JEDEC type number
(see Electrical Characteristics
table)
Applicable to: commercial 1N821, 1N823, 1N825, 1N827, and 1N829 only:
1N821 A -1 (e3)
JEDEC type number
(see Electrical Characteristics
table)
Zener Impedance
A = 10 ohms
Blank = 15 ohms
RoHS Compli ance
e3 = RoHS compliant
Blank = non-RoHS compliant
Metallurgical Bond
Applicable to: 1N822, 1N824, 1N826 and 1N828 only:
1N822 -1 (e3)
JEDEC type number
(see Electrical Characteristics
table)
Metallurgical Bond
RoHS Compli ance
e3 = RoHS compliant
Blank = non-RoHS compliant
T4-LDS-0220, Rev. 2 (7/29/13) ©2013 Microsemi Corporation Page 3 of 5
1N821-1 – 1N829A-1
SYMBOLS & DEFINITIONS
Symbol
Definition
I
R
Reverse Current: The maximum reverse (leakage) current that will flow at the specified voltage and temperature.
IZ, IZT, IZK
Regulator Current: The dc regulator current (IZ), at a specified test point (IZT), near breakdown knee (IZK).
VZ
Zener Voltage: The Zener voltage the device will exhibit at a specified current (IZ) in its breakdown region.
ZZT or ZZK
Dynamic Impedance: The small signal impedance of the diode when biased to operate in its breakdown region at a
specified rms cu rr e n t modulation (typically 10% of IZT or IZK) and superimpos ed on IZT or IZK respectively.
ELECTRICA L CHARACTERISTICS @ 25 oC (unless otherwise specified)
JEDEC
TYPE
NUMBER
ZENER
VOLTAGE
VZ @ IZT
(Note 3)
ZENER
TEST
CURRENT
IZT
MAXIMUM
ZENER
IMPEDANCE
ZZT @ IZT
(Note 1)
MAXIMUM
REVERSE
CURRENT
IR @ 3 V
VOLTAGE
TEMPERATURE
STABILITY
(
∆
VZT MAX)
-55oC to +100oC
(Note 2 and 3)
EFFECTIVE
TEMPERATURE
COEFFICIENT
α
VZ
Volts
mA
Ohms
µA
mV
% / oC
1N821-1
1N821A-1
5.89-6.51
5.89-6.51
7.5
7.5
15
10
2
2
96
96
0.01
0.01
1N822-1†
5.9-6.5
7.5
15
2
96
0.01
1N823-1
1N823A-1
5.89-6.51
5.89-6.51
7.5
7.5
15
10
2
2
48
48
0.005
0.005
1N824-1†
5.9-6.5
7.5
15
2
48
0.005
1N825-1
1N825A-1
5.89-6.51
5.89-6.51
7.5
7.5
15
10
2
2
19
19
0.002
0.002
1N826-1
6.2-6.9
7.5
15
2
20
0.002
1N827-1
1N827A-1
5.89-6.51
5.89-6.51
7.5
7.5
15
10
2
2
9
9
0.001
0.001
1N828-1
6.2-6.9
7.5
15
2
10
0.001
1N829-1
1N829A-1
5.89-6.51
5.89-6.51
7.5
7.5
15
10
2
2
5
5
0.0005
0.0005
† Double Anode: Electrical specifications apply under both bias polarities.
NOTES: 1. Zener impedance is measured by superimposing 0.75 mA ac rms on 7.5 mA dc @ 25 oC.
2. The maxim um allowable change observed over the ent i re temperature range i.e., the diode voltage will not exceed the
specified mV change at any discrete temperature between the establis hed l imits.
3. Volt age meas urem ents to be performed 15 seconds after applicat i on of dc current.
T4-LDS-0220, Rev. 2 (7/29/13) ©2013 Microsemi Corporation Page 4 of 5
1N821-1 – 1N829A-1
GRAPHS
Operating Current IZT (mA)
FIGURE 1
TYPICAL ZENER IMPEDANCE vs OPERATING CURRENT
IZ – Operating Current (m A) IZ – Operating Current (mA)
FIGURE 2 FIGURE 3
TYPICAL CHANGE OF TEMPERATURE COEFFICIENT TYPICAL CHANGE OF ZENER VOLTAGE
WITH CHANGE IN OPERATING CURRENT WITH CHANGE IN OPERATING CURRENT
The curve shown in Figure 2 is typical of the diode series and greatly simplifies the
estimation of the Temp er atu re C oe ffic ie nt (TC) wh en the diode is operat ed at
currents other than 7.5 mA.
EXAMPLE: A diode in this series is operated at a current of 7.5 mA and has
specified Temperature Coeffi ci ent ( TC) li mits of +/-0.005 %/oC. To obtain the
typical Temperature Coefficient limits for this same diode operated at a current of
6.0mA, the new TC limits (%/oC) can be estimated using the graph in Figure 2. At
a test current of 6.0mA the change in Temperature Coefficient (TC) is
approximately –0.0006 %/oC. The algebraic sum of +/-0.005 %oC and –0.0006
%/oC gives the new estimated limits of +0.0044 %/oC and -0.0056 %/oC.
Change in temperature coefficient (%/oC)
This curve i n Figu re 3 illustrates the change of diode voltage
arising from the effect of impedance. It is in effect an exploded
view of the Zener operating region of the I-V characteristic.
In conjunction with Fig ur e 2, this curve can be used to estimate
total voltage regulation under conditions of both varying
temperature and current.
∆V
Z
– Change in Zener Voltage (mV)
Zener Impedance IZT (Ohms)
T4-LDS-0220, Rev. 2 (7/29/13) ©2013 Microsemi Corporation Page 5 of 5
1N821-1 – 1N829A-1
PACKAGE DIMENSIONS
Ltr
Dimensions
Notes
Inch
Millimeters
Min
Max
Min
Max
BD
0.055
0.090
1.40
2.29
3
BL
0.120
0.200
3.05
5.08
3
LD
0.018
0.022
0.46
0.56
LL
1.000
1.500
25.40
38.10
LL1
0.050
1.27
4
NOTES:
1. Dimensions are in inches.
2. Millimeters are given for informat ion only.
3. Package contour optional within BD and length BL. Heat slugs, if any shall be included within this cylinder but shall not
be subject to minimum limit of BD.
4. Within this zone, lead diameter may vary to allow for lead finishes and irregularities, other than heat slugs.
5. In accordance with ASME Y14.5M, diameters are equivalent to Φx symbology.
