70021 ACME ELECTRIC, 70021 Datasheet - Page 7

• Manufacturer Part Number: 70021
• Description: Toroidal Transformer
• Manufacturer: ACME ELECTRIC

Specifications of 70021

• Power Rating: 5VA
• Secondary Voltages: 2 X 9V
• Secondary Current Nom: 2mA
• Transformer Mounting: PC Board
• Weight: 144g
• Transformer Type: Toroidal
• Secondary Current Aac: 278mA
• Output Current, Secondary Series: 278mA
• Frequency: 60Hz
• Output Current: 278mA
• Rohs Compliant: Yes
• Primary Voltages: 2 X 115V
• Mounting Type: PC Board
• Features: Low Profile
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Power system design engineers have come to recognize AMVECO as the
leading manufacturer of custom toroidal power transformers and inductors.
Over the years since 1982, we have built a reputation for excellence by
focusing on design engineering state-of-the-art production capabilities
and customer support services. Our quality management system has
been ISO 9001 certified since 1992.
• Polyester film-Class B (130˚C)
• Four layers minimum between windings
• Meets test requirement of 4000V RMS for 1
• All cores: 100% surface coverage of four
• Protects, insulates and cushions the core
AMVECO’s unique method to protect the wire
from the sharp corners of the core during the
winding operation permits unlimited choice of
core size to best meet the customer’s available
space. Other methods include use of plastic
end caps or dipping the core in epoxy. Amveco
can offer these methods too, if preferred by the
customer.
• Reduces capacitive coupling between primary
• Copper foil (2 mil) laminated between
• Tightly wound over primary insulation
• Base coat of Polyester. Heavy
• Wound uniformly over entire core
• Better heat dissipation
• Windings configured for
• Low voltage maintained
• Usually in primary circuit
• Normally closed-auto reset opens
• One-shot fuse also available
• UL, CSA, VDE listed components
UNMATCHED QUALIT Y/UNPARALLELED SERVICE
Electrostatic Shield (Customer Specified)
layers of 2 mil polyester film Class B (130˚C)
from windings and reduces vibration
minute between primary and secondary
and secondary windings
polyester film and tape
topcoat of amide imide (200˚C)
minimum flux leakage
between adjacent turns
at high temperature
Primary to Secondary Insulation
(Customer Specified)
Thermal Protection
Windings
Core Insulation
For technical and application notes, please visit our website.
• Cores are manufactured and annealed in-house, under
• Continuous tightly wound grain oriented silicon steel...
• Lathed radial corners... compact design, most efficient
• No core caps necessary
controlled conditions
no airgaps, no mechanical noise
use of materials
QUALIT Y TO THE CORE
• Choice of two types of leads connected to windings:
• Each lead anchored to toroid body with high tensile
• Primary leads covered with second layer of
• Color, length, stripping and terminations
*Self leads: The magnet wire is extended through sleeving
for connection to circuit. Standard: Class A (105˚C)
*Stranded wire leads: Class A (105˚C) - Class H (180˚C)
strength tape to withstand severe pull test
sleeving - double insulation... standard on
all units
can be customer specified
Core
When you select AMVECO for your power transformer needs you acquire
a team of experienced professionals that offer assistance from design to
delivery and beyond.
One simple fact verifies our quality claims: our customers stay with us
year after year and continue to trust us with their new product needs.
In addition to Class A insulation system, Amveco offers Class B (130˚C),
Class E (120˚C), Class F (155˚C) and Class H (180˚C).
Wire Leads
• Multiple layers of grain oriented
• Fixed in place by outer insulation
silicon steel tightly wound around
the toroid’s circumference
(Customer Specified)
• Tape wound type: Standard
• Magnetic enclosures optional
Magnetic Shield
two layers polyester film
Class B (130˚C)
• Thermoplastic material
• High mounting precision
• Threaded insert or press
• Thermally conductive
Outer Insulation
(Customer Specified)
fitted stud is optional
compound available
Center Hole Potting