1
HIGH FREQUENCY POWER PRODUCTS
Surface Mount Dual Inductors/Transformers
QTR-Pak
®
SMT Dual Inductors/1:1 Transformers
• Low EMI - toroid-based designs
• Space efficient - highest performance in smallest space,
height / area
- Combination of highest inductance @ current and/or
lowest resistance
• Superior SMT precision - 0.004-inch coplanarity, cartridge-brass pin/foot platform
• Tested for thermal shock, static humidity, random vibration, mechanical shock (18 x 8700Gs), solder
heat resistance, leaching, bend strength and board adhesion
• Used in Linear Technology, TI/Unitrode, National Semiconductor, MAXIM and IXYS circuits
HOW TO USE PLOTS –
POWER APPLICATIONS FROM 400
KHZ TO 2 MHZ:
• Determine peak current your inductor
or transformer will see in operation.
• Determine inductance requirement
(Note BH’s MIN L @ MAX I).
• Determine if your MIN inductance @
MAX current falls on or below the
curve (A).
- (If value is above curve, a larger part
is likely needed: Contact BH.)
- (Curve B is included to illustrate the
relationship between I, L & DCR.)
• Pick a part number from table below -
then contact BH.
SCHEMATICS
MECHANICALS
TOP VIEW
1
4
0.500 MAX.
2
3
0.250
SIDE VIEW
SUGGESTED PAD LAYOUT
PARALLEL
SERIES
TRANSFORMER
0.500 MAX.
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12219 Wood Lake Drive, Burnsville MN 55337 • Phone 952.894.9590 • Fax 952.894.9380 • www.bhelectronics.com
1
HIGH FREQUENCY POWER PRODUCTS
Surface Mount Dual Inductors/Transformers
QTR-Pak
®
and 8th-Pak
™
Rugged, Efficient & Versatile Designs – For Other Applications
•
•
•
•
•
Non 1:1 Power Transformers
Isolation Transformers
Gate Drive Transformers
Current Sense Transformers
Military Versions
Non 1:1 Power Transformers:
Designs based on Inductance @ Current plots
EXAMPLE:
QTR-Pak
®
Part Number 501-0657
(1:1.8 Transformer)
• As recommended by Linear Technology's
LTC1626-SYNC, high efficiency, 2-phase
synchronous step down switching regulator.
7uH MIN @ 4 Adc on primary. High voltage
test: 500 VDC @ 1 sec.
• This is but one example of many Non 1:1
transformers available in either QTR-Pak
®
or
8th-Pak™ surface mount packages.
Small Gate Drive Transformers:
2000 VAC / 1 sec
EXAMPLE:
8th-Pak™ Part Number 511-0002 (3:1
8th-Pak Gate Drive Transformer with 2000 VAC
isolation)
• Used with IXYS' IXBD4411/IXBD4411
ISOSMART chipset for 1- or 3-phase motor
controls and other IXYS applications. OCL
MIN, 53uH. Primary leakage inductance 0.45uH
MAX. Interwinding capacitance: 4pF MAX.
Current Sense Transformers:
QTR-Pak
®
/ 8th-Pak™ 1:50; 1:100; 1:200
EXAMPLE:
BH part numbers 500-2600 to
500-2605 (Current Sense Transformers)
• See page 16 for more information.
Isolation Transformers:
Up to 4000 VAC isolation with QTR-Pak
®
; 2000
VAC isolation with 8th-Pak™
EXAMPLE:
QTR-Pak
®
Part Number 510-1219 (1:1
QTR-Pak
®
Isolation Transformer, 2000 VAC)
• Rated at 14.6 uH MIN @ 3.24 Adc. This 2000V
isolation version of the 510-1019 QTR-Pak
®
(see catalog page 6) is consistent with the
Inductance @ Current plots. QTR-Pak
®
Isolation Transformers can meet your
requirements with isolation of 2000 or 4000V.
EXAMPLE:
BH 8th-Pak™ Part Number 511-1218
(1:1 8th-Pak™ Isolation Transformer, 2000 VAC)
• For use with Isolated Flyback Switching
Regulator like Linear Technology's LT1425 and
is rated at 24.0 uH MIN @ 1.11 Adc.
Military Versions:
QTR-Pak
®
/ 8th-Pak™
• Any of the QTR-Pak
®
and 8th Pak™
transformers can be made available in
MIL-PRF-27 versions (Grade 5, Class Q
thru S) depending on the application.
• Military Versions of the QTR-Pak
®
and 8th
Pak™ product have been successfully tested for
the following MIL-PRF-27 qualification
inspections: solderability, resistance to solvents,
resistance to soldering heat, terminal strength,
temperature rise, vibration, shock, thermal
shock, immersion, moisture resistance, overload,
flammability, life testing. Electrical testing is
performed throughout the testing process.
Tape & Reel Packaging:
EIA RS481-A; ASTM Approved
• QTR-Pak
®
@ 400/13-inch reel, 1,200 MIN releases
• 8th-Pak™ @ 1,000/13-inch reel
• Contact BH with your requirements
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12219 Wood Lake Drive, Burnsville MN 55337 • Phone 952.894.9590 • Fax 952.894.9380 • www.bhelectronics.com
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