1N5221B-1 thru 1N5281B-1
Screening in
500 mW GLASS AXIAL-LEAD
reference to
Available on
MIL-PRF-19500
commercial ZENER DIODES
versions
available
DESCRIPTION
The popular 1N5221B-1 thru 1N5281B-1 series of 0.5 watt Zener voltage regulators provides a
selection from 2.4 to 200 volts in standard 5% or 10% tolerances as well as tighter tolerances
identified by different suffix letters on the part number. These glass, axial-leaded DO-35
Zeners are also available in various up-screening levels by adding a prefix identifier as
described in the Part Nomenclature section of this datasheet. Microsemi also offers
numerous other Zener products to meet higher and lower power applications.
Important: For the latest information, visit our website 1N5221B-1 thru 1N5281B-1
MECHANICAL and PACKAGING
CASE: Hermetically sealed axial-lead glass DO-35 (DO-204AH) package.
TERMINALS: Tin-lead or RoHS compliant annealed matte-tin plating (commercial grade only) solderable per MIL-STD-750,
method 2026.
MARKING: Part number.
POLARITY: Cathode indicated by band. Diode to be operated with the banded end positive with respect to the opposite end for
Zener regulation.
TAPE & REEL option: Standard per EIA-296 (add TR suffix to part number). Consult factory for quantities.
WEIGHT: 0.2 grams.
See Package Dimensions on last page.
PART NOMENCLATURE
MQ 1N5221 B -1 (e3)
Reliability Level RoHS Compliance
MQ (reference JAN) e3 = RoHS Compliant (available
MX (reference JANTX) on commercial grade only)
MV (reference JANTXV) Blank = non-RoHS Compliant
MSP (reference JANS)
Blank = Commercial
Metallurgically Bonded
JEDEC type number
(see Electrical Characteristics
table)
Zener Voltage Tolerance
A = 10%
B = 5%
C = 2%
D = 1%
SYMBOLS & DEFINITIONS
Symbol Definition
I Reverse Current: The maximum reverse (leakage) current that will flow at the specified voltage and temperature.
R
I , I , I Regulator Current: The dc regulator current (I ), at a specified test point (I ), near breakdown knee (I ).
Z ZT ZK Z ZT ZK
I Maximum Regulator (Zener) Current: The maximum rated dc current for the specified power rating.
ZM
T Temperature Solder Pad: The maximum solder temperature that can be safely applied to the terminal.
SP
V Reverse Voltage: The reverse voltage dc value, no alternating component.
R
V Zener Voltage: The Zener voltage the device will exhibit at a specified current (I ) in its breakdown region.
Z Z
Dynamic Impedance: The small signal impedance of the diode when biased to operate in its breakdown region at a
Z or Z
ZT ZK
specified rms current modulation (typically 10% of I or I ) and superimposed on I or I respectively.
ZT ZK ZT ZK
T4-LDS-0232, Rev. 1 (111957) 2011 Microsemi Corporation Page 2 of 5