
HER251 - HER258
HIGH EFFICIENT
RECTIFIER DIODES
PRV : 50 - 1000 Volts
Io : 2.5 Amperes
FEATURES :
* High current capability
* High surge current capability
* High reliability
* Low reverse current
* Low forward voltage drop
* Fast switching for high efficiency
MECHANICAL DATA :
* Case : D2A Molded plastic
* Epoxy : UL94V-O rate flame retardant
* Lead : Axial lead solderable per MIL-STD-202,
Method 208 guaranteed
* Polarity : Color band denotes cathode end
* Mounting position : Any
* Weight : 0.645 gram
MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS
Rating at 25
°
C ambient temperature unless otherwise specified.
Single phase, half wave, 60 Hz, resistive or inductive load.
For capacitive load, derate current by 20%.
SYMBOL
HER
251
50
HER
252
100
HER
253
200
HER
254
300
HER
255
400
HER
256
600
HER
257
800
HER
258
1000
UNIT
Maximum Recurrent Peak Reverse Voltage
V
RRM
V
Maximum RMS Voltage
V
RMS
35
70
140
210
280
420
560
700
V
Maximum DC Blocking Voltage
Maximum Average Forward Current
0.375"(9.5mm) Lead Length Ta = 55
°
C
Maximum Peak Forward Surge Current,
8.3ms Single half sine wave superimposed
on rated load (JEDEC Method)
Maximum Peak Forward Voltage at I
F
= 2.5 A
Maximum DC Reverse Current Ta = 25
°
C
at Rated DC Blocking Voltage Ta = 100
°
C
Maximum Reverse Recovery Time ( Note 1 )
V
DC
50
100
200
300
400
600
800
1000
V
V
F
1.1
1.7
V
μ
A
μ
A
ns
I
R
10
I
R(H)
50
Trr
50
75
Typical Junction Capacitance ( Note 2 )
C
J
50
pf
°
C
°
C
Junction Temperature Range
T
J
- 65 to + 150
Storage Temperature Range
T
STG
- 65 to + 150
Notes :
( 1 ) Reverse Recovery Test Conditions : I
F
= 0.5 A, I
R
= 1.0 A, Irr = 0.25 A.
( 2 ) Measured at 1.0 MHz and applied reverse voltage of 4.0 V
DC
Page 1 of 2
Rev. 01 : April 2, 2002
A
A
RATING
I
F(AV)
I
FSM
100
2.5
D2A
0.040 (1.02)
0.0385 (0.98)
1.00 (25.4)
MIN.
0.161 (4.1)
0.154 (3.9)
0.284 (7.2)
0.268 (6.8)
1.00 (25.4)
MIN.
Dimensions in inches and ( millimeters )