313
process
yellow
3405
1797
1375
116
2607
652
242
2985
375
240
Embedded Power for
Business-Critical Continuity
Eighth-Brick 
B Series
Special Features
•Highefficiencytopology
•
Industrystandardeighth-brickfoot
print(identicaltoquarter-brick
pinout)
•Lowprofilethrough-holeand
surface mount version
•
38%spacesavingsoverquarter-
brickconverters
•Wideambienttemperature
range,-40ºC to +85 ºC
•90%to110%outputtrim
•100V,100msinputvoltage
transient rated
•Meetsbasicinsulation
requirementsofEN60950-1
•Industrystandardfeaturesets:
UVLO,OVP,OCP,OTP,O/Ptrim,
remote sense
•Regulationtozeroload
•Fixedfrequencyswitching
•Fasttransientswitching
•EUdirective2002/95/EC
compliantforRoHS
Safety
•UL/cUL60950-1CAN/CSA22.2
•TUVEN/IEC60950-1
Total Power:  Upto80Watts
Input Voltage:  36-75Vdc
No. of Outputs:  Single
 
Electrical Specifications*
Rev. 11.25.08_138
Eighth-Brick B Series
1 of 4
*Allspecificationsaretypicalatnominalinput,
fullloadat25°Cambientunlessotherwisestated.
Output
Voltageadjustability: 90%to110%
Minimumload: 0A
Overshoot: Atturn-onandturn-off None
Undershoot: Atturn-onandturn-off None
TransientResponse: 5%Vouttyp.deviation
(SeeNote1) 40µsrecovery
Input
Inputvoltagerange: 48Vnominal 36-75Vdc
Inputcurrent: Noload 100mA
RemoteOFF 10mA
ActivehighremoteON/OFF
Logiccompatibility: TTLcompatiblerefto-input
ON >2.4Vdc
OFF <0.8Vdc
UndervoltageLockout: Powerup 35.5V(typ.)
Powerup 35.5V(typ.)
Start-uptime: Powerup 25ms(typ.)
(SeeNote2) RemoteON/OFF 5ms(typ.)
Rev. 11.25.08_138
Eighth-Brick B Series
2 of 4
313
process
yellow
3405
1797
1375
116
2607
652
242
2985
375
240
Electrical Specifications
Notes
1 di/dt=1A/µs,Vin=48Vdc,Tc=25°C,loadchange=
50%to75%lomax.and75%to50%lomax.Deviation
variesbymodel.ForfurtherdetailsseeTechnical
ReferenceNotes(TRN).
2 Start-upintoresistiveload.
3 Thisproductisonlyforinclusionbyprofessional
installerswithinotherequipmentandmustnotbe
operatedasastandaloneproduct.
4 Recommendedinputfusingisupto10AHRC200V
ratedfuse.
5 Warranty:2years.
6 through-holeversionintendedforwavesoldering
process.
7 The‘J’suffixindicatesthatthesepartsarePb-free
(RoHS6/6)compliant.
General
Basicinsulation: Input/output 2250Vdc
Switchingfrequency: Fixed 500kHz
Approvalsand EN60950-1VDE
standards: UL/cUL60950-1
Materialflammability: UL94V-0
Weight: 20g(0.70oz)
MTBF: TelcordiaSR-332Issue1, 4.2Mhours
50%stress,40°Cambient
EMC Characteristics
Immunity:
ESDairenclosure: EN1000-4-28kV/6kV (O/Pwithinspec.)
Radiatedfieldenclosure: EN1000-4-310V/m (O/Pwithinspec.)
Conducted: EN1000-4-610V (O/Pwithinspec.)
Inputtransients: 100V,100ms
Environmental Characteristics
Thermalperformance: Operatingambient -40°Cto+85°C
temperature
Non-operating -40°Cto+125°C
Protection
Short-circuit: 115%withautomaticrecovery
Overvoltage: 125%Vo(typ)withautomaticrecovery
Thermal: 125°Chotspottemperaturewith
automatic recovery
PartNumberSystemwithOptions
Product
Family
LES
L=LowProfile
E=1/8Brick
S=SingleOutput
Rated Output
Current
22
22=22Amps,
20=20Amps,etc.
Vintage
B
A=1stgeneration
B=2ndgeneration
Nominal Rated
Input Voltage
                  48                 -
48=48Volts
(36-75VDCrange)
Type of
Output
2V5
2V5=2.5Volts
3V3=3.3Volts
Remote 
ON/OFF LOGIC
R
Blank=Positive
R=Negative
RoHS 
Compliance (7)
J
J=Pbfree(RoHS
6/6compliant)
Body Height, Package Type
 and Pin Length
E
A=0.33in(8.1mm),ThroughHole
0.19in(4.8mm),Pins
E=0.37in(9.1mm),ThroughHole
0.19in(4.8mm),Pins
S=0.33in(8.1mm),SurfaceMount
Ordering Information
Regulation
Output
Voltage
Output
Current
(Max)
Efficiency
(Typ)
Set Point
Accuracy
(Typ)
Line Load Ripple&Noise
(Typ)
ModelNumber(7)
12.0V 6.7 92% ±1% ±0.1% ±0.2% 70mVp-p LES06B48-12V0REJ
5.0V 13 92% ±1% ±0.1% ±0.2% 30mVp-p LES13B48-5V0REJ
3.3V 20 91% ±1% ±0.1% ±0.2% 30mVp-p LES20B48-3V3REJ
2.5V 22 90% ±1% ±0.1% ±0.2% 30mVp-p LES22B48-2V5REJ
1.8V 25 89% ±1% ±0.1% ±0.2% 30mVp-p LES25B48-1V8REJ
1.5V 25 88% ±1% ±0.1% ±0.2% 25mVp-p LES25B48-1V5REJ
1.2V 25 86% ±1% ±0.1% ±0.2% 25mVp-p LES25B48-1V2REJ
1.0V 25 85% ±1% ±0.1% ±0.2% 20mVp-p LES25B48-1V0REJ
Embedded Power for
Business-Critical Continuity
Embedded Power for
Business-Critical Continuity
313
process
yellow
3405
1797
1375
116
2607
652
242
2985
375
240
Rev. 11.25.08_138
Eighth-Brick B Series
3 of 4
MECHANICAL DETAILS AND DIMENSION OPTIONS FOR PTH PIN (LES B SERIES)
2.30 [58.4]
0.30 [7.62]
0.19 [4.8]
Height
(see table)
0.90 [22.9]
0.15 [3.8]
2.00 [50.80]
Clearance
(see table)
0.040 ± 0.004
[1.02 ± 0.10]
(6 pls)
0.062 ± 0.004
[1.57 ± 0.10]
(2 pls)
0.080 ± 0.004
[ 2.03 ± 0.10]
(2 pls)
0.90 [22.9]
0.15 [3.81]
2.00 [50.80]
2.30 [58.4]
0.30 [7.62]
0.15 [3.8]
RECOMMENDED HOLE PATTERN
0.058 ± 0.004
[ 1.50 ± 0.10]
(6 pls)
1
2
3
4
5
6
7
8
Through-hole Mechanical Drawing (for 1.8, 1.5, 1.2 and 1.0 V)
Surface-mount Mechanical Drawing (for 1.8, 1.5, 1.2 and 1.0 V)
2.30 [58.4]
2.30 [58.4]
0.30 [7.62]
0.014 [0.35] Min
0.90 [22.9]
0.15 [3.8]
0.062 ± 0.004
[1.57 ± 0.10]
(8 pls)
0.90 [22.9]
0.15 [3.81]
2.00 [50.80]
0.30 [7.62]
0.15 [3.8]
RECOMMENDED HOLE PATTERN
0.102 ± 0.004
[ 2.60 ± 0.10]
(8 pls)
0.33 ± 0.025
[6.4 ± 0.64]
2.00 [50.80]
Lead coplanarity within 0.006 [0.15]
1
2
3
4
5
6
7
8
Pin Connections
Pin  
number Function
1 Vin+
2ON/OFF
3Vin-
4 Vout-
5 Sense-
6Trim
7 Sense+
8Vout+
Suffix Height Clearance
±0.025[0.64] Minimum
A0.33(8.4) 0.004(0.10)
E0.37(9.4) 0.047(1.20)
Dimensionsareininches(millimeter)
Tolerances(unlessotherwisespecified)
X.XX±0.02(X.X±0.5)
X.XXX±0.010(X.XX±0.25)
Embedded Power for
Business-Critical Continuity
313
process
yellow
3405
1797
1375
116
2607
652
242
2985
375
240
Rev. 11.25.08_138
Eighth-Brick B Series
4 of 4
Americas 
5810VanAllenWay
Carlsbad,CA92008
USA
Telephone:+17609304600
Facsimile: +17609300698
Europe (UK)
WaterfrontBusinessPark
MerryHill,Dudley
WestMidlands,DY51LX
UnitedKingdom
Telephone:+44(0)1384842211
Facsimile: +44(0)1384843355
Asia (HK)
14/F,LuPlaza
2WingYipStreet
KwunTong,Kowloon
HongKong
Telephone:+85221763333
Facsimile: +85221763888
Forglobalcontact,visit:
www.powerconversion.com
techsupport.embeddedpower@ 
emerson.com
Whileeveryprecautionhasbeentakentoensure
accuracyandcompletenessinthisliterature,Emerson
NetworkPowerassumesnoresponsibility,anddisclaims
allliabilityfordamagesresultingfromuseofthis
informationorforanyerrorsoromissions.
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NetworkPowerlogoaretrademarksand
servicemarksofEmersonElectricCo.
©2008EmersonElectricCo.
EmersonNetworkPower.com
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ACPower
Connectivity
DCPower
MECHANICAL DETAILS AND DIMENSION OPTIONS FOR PTH PIN (LES B SERIES)
2.30 [58.4]
0.30 [7.62]
0.19 [4.8]
Height
(see table)
0.90 [22.9]
0.15 [3.8]
2.00 [50.80]
Clearance
(see table)
0.040 ± 0.004
[1.02 ± 0.10]
(6 pls)
0.062 ± 0.004
[1.57 ± 0.10]
(2 pls)
0.080 ± 0.0043
[ 2.03 ± 0.10]
(2 pls)
0.90 [22.9]
0.15 [3.81]
2.00 [50.80]
2.30 [58.4]
0.30 [7.62]
0.15 [3.8]
RECOMMENDED HOLE PATTERN
0.058 ± 0.004
[ 1.50 ± 0.10]
(6 pls)
1
2
34
5
6
7
8
Through-hole Mechanical Drawing (for 2.5, 3.3, 6 and 12 V)
Surface-mount Mechanical Drawing (for 2.5, 3.3, 6 and 12 V)
MECHANICAL DETAILS AND DIMENSION OPTIONS FOR SMT PIN (LES SERIES)
2.30 [58.4]
0.30 [7.62]
0.90 [22.9]
0.15 [3.8]
2.00 [50.80]
0.33 ± 0.025
[8.4 ± 0.64]
0.062 ± 0.004
[1.57 ± 0.10]
(8 pls) 0.102 ± 0.004
[ 2.60 ± 0.10]
(8 pls)
0.90 [22.9]
0.15 [3.81]
2.00 [50.80]
2.30 [58.4]
0.30 [7.62]
0.15 [3.8]
RECOMMENDED HOLE PATTERN
0.014 [0.35] Min
Lead coplanarity within 0.006 [0.15]
1
2
34
5
6
7
8