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Date:- 15 Nov, 2001

Data Sheet Issue:- 1

Fast Recovery Diode

Types M1104NC400 to M1104NC450

Absolute Maximum Ratings

VRRM

VRSM

VOLTAGE RATINGS

Repetitive peak reverse voltage, (note 1)

Non-repetitive peak reverse voltage, (note 1)

MAXIMUM

LIMITS

4000-4500

4100-4600

UNITS

IF(AV)

IF(RMS)

IF(d.c.)

IFSM

IFSM2

I2t

THS

Tstg

OTHER RATINGS (note 6)

Mean forward current, Tsink=55°C, (note 2)

Mean forward current. Tsink=100°C, (note 2)

Mean forward current. Tsink=100°C, (note 3)

Nominal RMS forward current, Tsink=25°C, (note 2)

D.C. forward current, Tsink=25°C, (note 4)

Peak non-repetitive surge tp=10ms, VRM=0.6VRRM, (note 5)

Peak non-repetitive surge tp=10ms, VRM≤10V, (note 5)

I2t capacity for fusing tp=10ms, VRM=0.6VRRM, (note 5)

I2t capacity for fusing tp=10ms, VRM≤10V, (note 5)

Operating temperature range

Storage temperature range

Notes:-

1) De-rating factor of 0.13% per °C is applicable for Tj below 25°C.

2) Double side cooled, single phase; 50Hz, 180° half-sinewave.

3) Single side cooled, single phase; 50Hz, 180° half-sinewave.

4) Double side cooled.

5) Half-sinewave, 125°C Tj initial.

MAXIMUM

LIMITS

1104

539

315

2183

1884

13.0

14.3

845×103

1.02×106

-40 to +125

UNITS

A2s

°C

Data Sheet. Types M1104NC400 to M1104NC450 Issue 1

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November, 2001

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Characteristics

M1104NC400 to M1104NC450

PARAMETER

VFM Maximum peak forward voltage

V0 Threshold voltage

rS Slope resistance

VFRM Maximum forward recovery voltage

IRRM Peak reverse current

Qrr Reverse Recovery Charge

Qra Recovered charge, 50% Chord

Irm Reverse Recovery Current

trr Reverse recovery time, 50% Chord

Rth(j-hs) Thermal resistance, junction to heatsink

F Mounting force

Wt Weight

MIN.

TYP.

2100

800

220

6.0

510

MAX. TEST CONDITIONS (Note 1)

2.2 IFM=1500A

1.37

0.553

170 di/dt = 1000A/µs

100 di/dt = 1000A/µs, Tj=25°C

50 Rated VRRM

1070

IFM=1000A, tp=1000µs, di/dt=60A/µs,

Vr=50V, 50% Chord.

0.022 Double side cooled

0.044 Single side cooled

Notes:-

1) Unless otherwise indicated Tj=125°C.

UNITS

mΩ

µC

µs

K/W

Data Sheet. Types M1104NC400 to M1104NC450 Issue 1

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Notes on Ratings and Characteristics

1.0 Voltage Grade Table

Voltage Grade

VRRM

(V)

4000

4200

4400

4500

M1104NC400 to M1104NC450

VRSM

(V)

4100

4300

4500

4600

VR dc

(V)

2000

2040

2080

2100

2.0 De-rating Factor

A blocking voltage de-rating factor of 0.13% per °C is applicable to this device for Tj below 25°C.

3.0 ABCD Constants

These constants (applicable only over current range of VF characteristic in Figure 1) are the coefficients of

the expression for the forward characteristic given below:

VF = A + B ⋅ ln(I F ) + C ⋅ I F + D ⋅ I F

where IF = instantaneous forward current.

4.0 Reverse recovery ratings

(i) Qra is based on 50% Irm chord as shown in Fig.(a) below.

(ii) Qrr is based on a 125µs integration time.

150 µs

∫I.e. Qrr = irr .dt

(iii)

K Factor = t1

Data Sheet. Types M1104NC400 to M1104NC450 Issue 1

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November, 2001

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5.0 Reverse Recovery Loss

M1104NC400 to M1104NC450

The following procedure is recommended for use where it is necessary to include reverse recovery loss.

From waveforms of recovery current obtained from a high frequency shunt (see Note 1) and reverse

voltage present during recovery, an instantaneous reverse recovery loss waveform must be constructed.

Let the area under this waveform be E joules per pulse. A new sink temperature can then be evaluated

from:

[ ]TSINK = TJ (MAX ) − E ⋅ k + f ⋅ Rth(J −Hs)

Where k = 0.2314 (°C/W)/s

E = Area under reverse loss waveform per pulse in joules (W.s.)

f = Rated frequency in Hz at the original sink temperature.

Rth(J-Hs) = d.c. thermal resistance (°C/W)

The total dissipation is now given by:

W(tot ) = W(original ) + E ⋅ f

NOTE 1 - Reverse Recovery Loss by Measurement

This device has a low reverse recovered charge and peak reverse recovery current. When measuring the

charge, care must be taken to ensure that:

(a) AC coupled devices such as current transformers are not affected by prior passage of high

amplitude forward current.

(b) A suitable, polarised, clipping circuit must be connected to the input of the measuring oscilloscope

to avoid overloading the internal amplifiers by the relatively high amplitude forward current signal.

damped snubber, connected across diode anode to cathode. The formula used for the calculation of this

snubber is shown below:

R2 = 4 ⋅ Vr

⋅

Where: Vr = Commutating source voltage

CS = Snubber capacitance

R = Snubber resistance

Data Sheet. Types M1104NC400 to M1104NC450 Issue 1

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6.0 Computer Modelling Parameters

6.1 Device Dissipation Calculations

M1104NC400 to M1104NC450

I AV = − Vo +

Vo2 + 4 ⋅ ff 2 ⋅ rs ⋅WAV

2 ⋅ ff 2 ⋅ rs

Where Vo = 1.37 V, rs = 0.553mΩ

ff = form factor (normally unity for fast diode applications)

WAV

∆T

Rth

∆T = Tj(MAX ) − THs

6.2 Calculation of VF using ABCD Coefficients

The forward characteristic IF Vs VF, on Fig. 1 is represented in two ways;

(i) the well established V0 and rs tangent used for rating purposes and

(ii) a set of constants A, B, C, and D forming the coefficients of the representative equation for VF in

terms of IF given below:

VF = A + B ⋅ ln(IF ) + C ⋅ IF + D ⋅ IF

The constants, derived by curve fitting software, are given in this report for hot characteristics. The

resulting values for VF agree with the true device characteristic over a current range, which is limited to

that plotted.

125°C Coefficients

A 0.655103028

B 0.05722978

C 4.08311×10-4

D 0.01326875

Data Sheet. Types M1104NC400 to M1104NC450 Issue 1

Page 5 of 11

November, 2001