Page 1
LDR3__50 To Be Offered as Replacement
for LD43__50 POW-R-BLOK™
# : 2017-024 Rev.: 00
Date: 2017 / JUL / 21
Author: Ron Yurko
Subject of Change:
Introduction of new part type LDR3__50 to be offered as a direct replacement for Powerex LD43__50 dual SCR modules.
They are drop in replacements both mechanically and electrically with minor differences noted below.
Description of Change:
Resulting from the transfer of the manufacturing operations for the LD43 module from the former Powerex facility located
in Morocco to the Powerex manufacturing partner facility located in Poland to provide increased options in supply,
Powerex will be offering a new product LDR3__50 for consideration as a replacement for the LD43__50 module. It is an
equivalent replacement, but there will be differences in the mechanical and electrical characteristics. Please review the
product data sheet and make determination as to whether this product will be a suitable replacement for use in their
application. These differences include, but are not limited, to the following:
Slightly less overall length dimension (149 mm) for the LDR3 as compared to the 150 mm overall length of the
LD43.
Slightly wider terminals (26 mm on terminals 2 & 3) for the LDR3 as compared to the terminal widths for the
LD43 (25.4 mm on terminals 2 & 3)
A slightly smaller screw depth under the terminals of 17 mm for the LDR3 as compared to the 17.5 mm depth for
the LD43
This module is being developed with a manufacturing partner with a country of origin of Russia that has a quality
management system that is in compliance with ISO 9001. This product is RoHS and REACH compliant and is
UL Recognized.
Reason for Change:
A new product is being introduced to assist with customer demand after unforeseen issues and difficulties with the
transition of the LD43__50 dual SCR modules from the former Powerex manufacturing facility located in Morocco which
was to be transferred to the former Westinghouse site and manufacturing partner facility located in Poland earlier this year.
Identification of Change:
This new product will be identified by a new part number LDR3__50 and will be labeled with PRX RU.
This module package has slightly different physical characteristics that differentiate it from the original LD43__50 modules.
Time Schedule for Change:
Delivery Begins: Third Quarter of 2017
Supporting Documentation:
Attachment – LDR3__50 Data Sheet
Quality Management system:
The Powerex partner manufacturing facility has a quality system that is in compliance with ISO 9001.
Parts will be qualified at the Powerex Youngwood, PA facility which has a quality system that is in compliance with ISO
9001 and AS9100.
Product Change Notification
Continued on following page
Page 2
LD43 Part
Recommended Replacement
LD430850
LDR30850
LD431050
LDR31050
LD431250
LDR31250
LD431450
LDR31450
LD431650
LDR31650
LD431850
LDR31850
Product Change Notification
PCN 2017-024
Recommended Replacements for LD43__50 Dual SCR Modules
Page 3
Characteristic
Symbol
LD43__50
Limit
LD43__50 Test
Conditions
LDR3__50
Limit
LDR3__50 Test
Conditions
Average Forward Current
IT(AV)
500 A
180° Conduction, TC=86°C
500 A
180° Conduction, TC=85°C
RMS Forward Current
IT(RMS)
900 A
180° Conduction, TC=86°C
785 A
180° Conduction, TC=85°C
Peak One Cycle Surge Current,
Non-Repetitive
ITSM
25,500 A
60 Hz, 0V reapplied,
Tj=125°C
17,000 A
60 Hz, 0V reapplied, Tj= T
j MAX
ITSM
24,450 A
50 Hz, 0V reapplied,
Tj=125°C
15,500 A
50 Hz, 0V reapplied, Tj= T
j MAX
I2t for Fusing for One Cycle
I2t
2.70 x 106 A2sec
60 Hz, 0V reapplied,
Tj=125°C
1.19 x 106 A2sec
60 Hz, 0V reapplied, Tj= T
j MAX
I2t
2.90 x 106 A2sec
50 Hz, 0V reapplied,
Tj=125°C
1.20 x 106 A2sec
50 Hz, 0V reapplied, Tj= T
j MAX
Average Forward Gate Power
P
G(AV)
5 W 4 W
Maximum Rate-of-Rise of OnState Current, (Repetitive)
di/dt
200 A/µs
Per JEDEC Standard 397
5.2.2.6
400 A/µs
T= Tj max, VD= 0.67 VDRM,
ITM= 2 ITAV, Gate Pulse: IG= 2
A, tGP= 50 μs, diG/dt>= 1 A/μs
Storage Temperature
T
stg
-40 to +150 °C
-40 to +125 °C
Repetitive Peak Forward Leakage
Current
I
DRM
80 mA max
V=V
DRM
, Tj=130°C
70 mA max
V=V
DRM
, Tj=130°C
Repetitive Peak Reverse Leakage
Current
I
RRM
80 mA max
V=V
RRM
, Tj=130°C
70 mA max
V=V
RRM
, Tj=130°C
Peak On-State Voltage
VTM
1.30 V max
Tj=25°C, ITM=1500 A
1.50 V max
Tj=25°C, ITM=1570 A
Gate Trigger Current
IGT
200 mA max
Tj=25°C, VD=12V
250 mA max
Tj=25°C, VD=12V
Gate Trigger Voltage
VGT
3.0 V max
Tj=25°C, VD=12V
2.50 V max
Tj=25°C, VD=12V
Peak Forward Gate Current
I
GTM
4.0 A max
Tj=25°C
10 mA max
Tj=130°C, VD=0.67 V
DRM
Peak Reverse Gate Voltage
V
GRM
5 V max.
Tj=25°C
0.25 V max
Tj=130°C, VD=0.67 V
DRM
Latching Current
IL
600 mA
Tj=25°C
1000 mA max
Tj=25°C, VD=12V
Holding Current
IH
200 mA
Tj=25°C
300 mA max
Tj=25°C, VD=12V
Turn-Off Time
tq
150 µs typical
Itm=1000A, tp=1ms,
dI/dt=10A/us,
dVr/dt=200V/us,
Vdr=80%Vdrm, Vr=50V,
Tj=130oC
250 µs max
Tj=130°C, dv/dt= 50 V/µs,
ITM= I
T(AV)
, di/dt= 10 A/µs,
VR= 100 V, VD= 0.67 V
DRM
Recovered Charge
Q
rr
1250 µC typical
Itm=1000A, tp=1ms,
dI/dt=10A/us, Vr=50V,
Tj=130oC
Not Available
Not Available
Recovered Charge (50% Chord)
Q
ra
960 µC typical
Reverse Recovery Current
I
rm
115 A typical
Reverse Recovery Time (50%
Chord)
trr
16 µs typical
Product Change Notification
PCN 2017-024
Differences between the LD43__50 modules and LDR3__50 modules include, but are not limited to, the following:
Ratings and Electrical Characteristics:
Page 4
Dimension
LD43 (mm)
LDR3 (mm)
A
150
149
L
25.4
26
M
17.5
17
R 6 5
J F
C
B
A
R
L H
Q - DIA. (4 TYP.)
P - M10 THD (3 TYP.)
K D
G
M
N
S
E
T - (4 TYP.)
1
2
3
OUTLINE DRAWING
4
5 6
7
Product Change Notification
PCN 2017-024
Mechanical differences between the LD43__50 modules and LDR3__50 modules include, but are not limited to, the
following:
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