1N4454 & 1N4954 Diode Curves

1N4454 Diode Characteristics

1N4454 Diode Temperature-Current Derating Curve [DO-213AA]
High Conductance Ultra Fast Diode.

1N4454 PCB Temperature-Current Derating Curve
1N4454 Diode Current Derating Curve, PCB Temperature

Thermal Characteristics:
Derate the 1N4454 above 250C by 3.33mW/0C.
The part number defines the package type; see below

Use the 1N4454 diode graph to determine maximum operation current based on the operational temperature of the Printed Circuit Board [PCB]. Diode Derating Curves.
Temperature-Current derating is a standard design practice for electrical engineers, use the two gray curves for proper derating of the 1N4454 diode.
To obtain a higher operational operating temperature apply forced air cooling, the graph relates to still air, and as stated in the graph, the temperature of the Printed Circuit Board [PCB].

Refer to MIL-PRF-19500/144; Semiconductor Device, Silicon, Switching Diode Types:
1N4454-1 [DO-35 axial lead, glass package], in full production.
1N4454UR-1 [DO-213AA SMD, MELF package]
1N4532 [DO-34, axial lead similar to a DO-35 package]
1N3064 [DO-7 axial lead similar to a Do-34 and DO-35 package]
1N4454UB, 1N4454UBCA, 1N4454UBCC, 1N4454UBD [UB, surface mount, three terminal chip type, the part number variation indicate different configurations]
Note the UB package is a completely different style of surface mount package, normally square in shape with solder pads.

1N4454 Diode Maximum Ratings:
Maximum Repetitive Reverse Voltage = 50 volts
Average Rectified Forward Current = 200 mA
Power Dissipation 250C = 500mW [Still Air]
Operating Junction Temperature = +175 0C [Tj]
Storage Temperature = -65 to +200 0C [Tstg]

The 1N4454 is in Full Production as of 2009.
Refer to the data sheet for more details.
The other parts are listed regardless of being active or not.
The DO-213 is a Melf package, the term used for this style SMD.
Melf packages are also being widely used for two terminal components.

1N4153 Diode Characteristics

1N4153 Diode Temperature-Current Derating Curve [DO-213]
Small Signal Diode.

1N4153 Derating Curve, Do213 package
1N4153 Temperature-Current Derating Curve

Use the current rating curve to determine maximum operational forward current based on ambient temperature. For temperatures above 250C the current must be reduce to maintain junction temperature.
Current derating is not required if the 1N4153 is operated at 'room' temperature. Adding forced air cooling will reduce the requirement for derating, the graph is for free-air [still-air].
The DO-213 is a surface mount package, if possible increase the pad size on the PWB [Printed Wiring Board] to act as a heat sink.

Refer to MIL-PRF-19500/337; Semiconductor Device, Diode, Silicon, Switching, Types 1N4153-1, 1N4153UR-1, 1N4153UB, 1N4153UBCA, 1N4153UBCC, 1N4153UBD, 1N4534, and 1N4534UB, JAN, JANTX, JANTXV, JANHC, and JANKC, [DO-213AA, UB]

1N4153 Maximum Operation Ratings:
Maximum Repetitive Reverse Voltage = 75 volts
Average Rectified Forward Current = 200 mA
Power Dissipation 250C = 500mW
Operating Temperature = -65 to +200 0C

DO-213 Surface Mount Package
DO-213 Diode Package

Manufacturers of Diodes
Manufacturers Zener Diodes

How to Derate;
Guideline for Derating Components

Derate Temperature by Package;
DO-213 Diode Derating Curve

Engineering topic:
Military DO-213 Diode power derating,
Reducing Burn-Out and increasing reliability.
Increase pad size for better heat transfer.

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Modified 1/21/12
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