www.murata-ps.com
1638 & 1639
Token Ring Isolators for IEEE 802.5 Systems
SELECTION GUIDE
Isolation
Voltage
V
DC
1638C
1639C
1:1:2:2
1:1:1:1
700
Insertion Loss
(Typ.)
100kHz-12MHz,
1.0Vrms
dB
0.2
Common Mode
Rejection Ratio (Typ.)
1MHz,
0.5Vrms
dB
67
Rise Time Propogation
(Typ.)
Delay (Typ.)
4MHz,
5Vp-p
ns
5.0
Order Code
Turns Ratio
4MHz,
5Vp-p
ns
2.5
ABSOLUTE MAXIMUM RATINGS
Operating free air temperature range
Storage temperature range
0°C to 70°C
-60°C to 125°C
SOLDERING INFORMATION
1
FEATURES
compliant
RoHS
802.5 compatible
IEEE
Industry-standard footprint
Peak wave solder temperature, 1.5mm from case
Pin finish
1 For further information, please visit www.murata-ps.com/rohs
All specifications typical at T
A
=25°C.
300˚C
Tin
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
12.9 (0.508)
DESCRIPTION
These devices are designed to provide
transformer coupling between the Ring Interface
Circuit and the Medium Interface Cable in IEEE
802.5 Token Ring interface applications. The
devices are capable of working at data rates of 1
to 16Mbps and can transmit the non-data J and K
symbols. The turns ratios are precisely controlled
to enable accurate centre taps to be formed
when required. Ratios of 1:1:1:1 and 1:1:2:2 are
available in a 8 pin DIL package style. All devices
offer isolation of 700VDC and are supplied in
packages using UL 94V-0 rated materials.
PIN CONNECTIONS
8 PIN DIL
6.86
(0.27)
1638C
XYYWW
8
N
1
7
6
N
1
5
5.8
(0.228)
1
2
3
4
4.50 (0.177) Min.
0.64 (0.025)
2.54 (0.10)
7.62 (0.3)
0.25±0.05
(0.01±0.002)
For full details go to
www.murata-ps.com/rohs
Unless otherwise stated all dimensions in mm (inches) ±0.25 (0.01).
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2014 Murata Power Solutions, Inc.
www.murata-ps.com
KMP_1638C_1639C_C01
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