MLL5518B-1

Surface mount equivalent to JEDEC registered 1N5518 thru 1N5546 series
Internal metallurgical bond with the "-1" suffix
Also available in JAN, JANTX, and JANTXV qualifications per MIL-PRF-19500/437 by adding the JAN, JANTX, or JANTXV prefixes to part numbers for desired level of screening;                        (e.g.JANTX1N4099UR-1, JANTXV1N4109CUR-1, etc.)
Nonbonded types also available without the "-1" suffix for both the axial and surface mount packages 
DO-7 or DO-35 glass body axial-leaded Zener equivalents also available per JEDEC registration with part numbers 1N5518 thru 1N5546 on separate data sheets

Regulates voltage over a broad operating current and temperature range
  Extensive selection from 3.3 to 33 V
Standard voltage tolerances are plus/minus 5% with a "B" suffix, e.g. 1N5518BUR-1, etc. 
Tight tolerances available in plus or minus 2% or 1% with C or D suffix respectively, e.g. 1N5518CUR-1, 1N5518DUR-1, etc.
  Hermetically sealed surface mount package
  Nonsensitive to ESD per MIL-STD-750 Method 1020
  Minimal capacitance (see Figure 3)
Inherently radiation hard as described in Microsemi MicroNote 050  
 

*  Operating and Storage temperature:  -65^oC to +175^oC 
*  Thermal Resistance:  100 ^oC /W junction to end cap, or 250C/W junction to ambient when mounted on FR4 PC board (1 oz Cu) with recommended footprint (see last page) 
*  Steady-State Power:  0.5 watts at end cap temperature TEC < 125 ^oC  or at ambient TA < 50^oC when mounted on FR4 PC board as described for thermal resistance above (see Figure 2  for derating)
*  Forward voltage @200 mA:  1.1 volts  
*  Solder Temperatures:  260 C for 10 s (max) 

The MLL5518B-1series of  0.5 watt glass surface mount Zener voltage regulators provides a selection from 3.3 to 33 volts in standard 5% tolerances as well as tighter tolerances identified by different suffix letters on the part number.  These have an internal-metallurgical-bond option as identified by the "1" suffix.  This internally bonded Zener package construction  of MLL5518B-1 is also in  JAN, JANTX, and  JANTXV military qualifications.  Microsemi also offers numerous other Zener products to meet higher and lower power applications.