Littelfuse SMF User Manual

Transient Voltage Suppression Diodes

Bi-directional

Datasheet

Surface Mount – 200W > SMF Series

SMF Series

Uni-directional

Agency Approvals

AGENCY AGENCY FILE NUMBER

E230531

Maximum Ratings and Thermal Characteristics

(T

=25°C unless otherwise noted)

A

Parameter Symbol Value Unit

Peak Pulse Power Dissipation at

=25ºC by 10/1000µs (Note 1)

T

A

Thermal Resistance Junction- to­Ambient

Thermal Resistance Junction- to­Lead

Operating and Storage Temperature
Range

Notes:

1. Non-repetitive current pulse, per Fig. 4 and derated above T

P

R

R

T

J,TSTG

PPM

THJ-A

THJ-L

200 W

220 °C/W

100 °C/W

-55 to 150 °C

=25ºC per Fig. 3.

A

RoHS

Description

The SMF series is designed specifically to protect sensitive
electronic equipment from voltage transients induced by
lightning and other transient voltage events.

SMF package is 50% smaller in footprint when compare to
SMA package and deliverying low height profile (1.1mm) in
the industry.

Features

• Compatible with

industrial standard
package SOD-123F

• For surface mounted

applications to optimize
board space

• Low prole: maximum

height of 1.1mm.

• Typical failure mode is

short from over-specified
voltage or current

• Whisker test is conducted

based on JEDEC
JESD201A per its table 4a
and 4c

• IEC-61000-4-2 ESD

30kV(Air), 30kV (Contact)

• ESD protection of data

lines in accordance with

IEC 61000-4-2 (IEC801-2)

• Low inductance, excellent

clamping capability

• 200W peak pulsepower

capability at 10/1000µs
waveform, repetition rate

(duty cycle): 0.01%

• Fast response time:

typically less than 1.0ns
from 0 Volts to V

BR

min

• High temperature
soldering: 260°C/40

seconds at terminals

• Glass passivated junction

• Built-in strain relief

• Meet MSL level1, per

J-STD-020, LF maximum
peak of 260°C

• Matte tin lead–free plated

• Halogen-free and RoHS

compliant

• EFT protection of data

lines in accordance with

IEC 61000-4-4 (IEC801-4)

Functional Diagram

Cathode

Uni-directional

© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 01/20/14

Anode

Applications

SMF devices are ideal for the protection of I/O interfaces,
V

bus and other vulnerable circuit used in cellular phones,

CC

portable devices, business machines, power supplies and
other consumer applications.

Additional Information

Resources

Samples

Transient Voltage Suppression Diodes

Surface Mount – 200W > SMF Series

Electrical Characteristics (T

=25°C unless otherwise noted)

A

Breakdown

Part

Number

Marking

Code

Voltage V
(Volts) @ I

BR

T

MIN MAX

Test

Current

I

T

(mA)

Reverse

Stand off

Voltage V

R

(V)

Maximum

Reverse

Leakage @ V

IR (µA)

Maximum
Peak Pulse
Current Ipp

R

(A)

Maximum

Clamping

Voltage @

I

pp

VC (V)

SMF5.0A AE 6.40 7. 0 0 10 5.0 400 21.7 9.2 X
SMF6.0A AG 6.67 7.37 10 6.0 400 19.4 10.3 X
SMF6.5A AK 7.22 7.98 10 6.5 250 1 7. 9 11. 2 X

SMF7.0A AM 7.78 8.60 10 7.0 100 16.7 12.0 X
SMF7.5A AP 8.33 9.21 1 7.5 50 15.5 12.9 X

SMF8.0A AR 8.89 9.83 1 8.0 25 14.7 13.6 X
SMF8.5A AT 9.44 10.40 1 8.5 10 13.9 14.4 X

SMF9.0A AV 10.00 11. 1 0 1 9.0 5 13.0 15.4 X

SMF10A AX 11. 10 12.30 1 10 2.5 11. 8 1 7. 0 X

SMF11A AZ 12.20 13.50 1 11 2.5 11. 0 18.2 X
SMF12A BE 13.30 14.70 1 12 2.5 10.1 19.9 X
SMF13A BG 14.40 15.90 1 13 1. 0 9.3 21.5 X
SMF14A BK 15.60 17.20 1 14 1. 0 8.6 23.2 X
SMF15A BM 16.70 18.50 1 15 1. 0 8.2 24.4 X
SMF16A BP 17.80 19.70 1 16 1. 0 7. 7 26.0 X
SMF17A BR 18.90 20.90 1 17 1. 0 7. 2 27.6 X
SMF18A BT 20.0 0 22.10 1 18 1. 0 6.8 29.2 X
SMF20A BV 22.20 24.50 1 20 1.0 6.2 32.4 X
SMF22A BX 24.40 26.90 1 22 1.0 5.6 35.5 X
SMF24A BZ 26.70 29.50 1 24 1.0 5.1 38.9 X

SMF26A CE 28.90 31.90 1 26 1.0 4.8 42.1 X
SMF28A CG 31.10 34.40 1 28 1.0 4.4 45.4 X

SMF30A CK 33.30 36.80 1 30 1.0 4.1 48.4 X
SMF33A CM 36.70 40.60 1 33 1. 0 3.8 53.3 X
SMF36A CP 40.0 0 44.20 1 36 1.0 3.4 58.1 X
SMF40A CR 44.40 49.10 1 40 1. 0 3.1 64.5 X
SMF43A CT 47.80 52.80 1 43 1.0 2.9 69.4 X
SMF45A CV 50.00 55.30 1 45 1.0 2.8 72.7 X
SMF48A CX 53.30 58.90 1 48 1.0 2.6 77.4 X
SMF51A CZ 56.70 62.70 1 51 1.0 2.4 82.4 X
SMF54A DE 60.00 66.30 1 54 1. 0 2.3 87.1 X

SMF58A RG 64.40 71.20 1 58 1. 0 2.1 93.6 X
SMF60A RK 66.70 73.70 1 60 1.0 1. 8 96.8 X
SMF64A RM 71.10 78.60 1 64 1.0 1. 7 103.0 X

SMF70A RP 77.80 86.00 1 70 1.0 1. 5 113.0 X
SMF75A RR 83.30 92.10 1 75 1.0 1.4 121.0 X

SMF78A RT 86.70 95.80 1 78 1.0 1. 4 126.0 X
SMF85A RV 94.40 104.00 1 85 1. 0 1. 3 137.0 X

Notes:

1. V

measured after IT applied for 300µs, IT = sequare wave pulse or equivalent.

BR

2. Surge current waveform per 10/100 0µs exponential wave and derated per Fig.2.

3. All terms and symbols are consistent with ANSI/IEEE C62.35.

Agency

Approval

Specifications are subject to change without notice.

© 2014 Littelfuse, Inc.

Revised: 01/20/14

Transient Voltage Suppression Diodes

Voltage Transients

Time

Voltage Across TVS

Current Through TVS

Voltage or Current

Surface Mount – 200W > SMF Series

I-V Curve Characteristics

Uni-directional

BR

V

Vc

VR

IR

VF

IT

Ipp

V

P

Peak Pulse Power Dissipation -- Max power dissipation

PPM

V

Stand-off Voltage -- Maximum voltage that can be applied to the TVS without operation

R

V

Breakdown Voltage -- Maximum voltage that ows though the TVS at a specied test current (IT)

BR

V

Clamping Voltage -- Peak voltage measured across the suppressor at a specified Ippm (peak impulse current)

C

I

Reverse Leakage Current -- Current measured at V

R

V

Forward Voltage Drop for Uni-directional

F

Ratings and Characteristic Curves (T

Figure 1 - TVS Transients Clamping Waveform

R

=25°C unless otherwise noted)

A

Figure 2 - Peak Pulse Power Rating Curve

10

1

-Peak Pulse Power (kW)

PPM

P

0.1

0.0000010.000010.0001 0.001

t

-Pulse Width (sec.)

d

continues on next page.

© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 01/20/14

Transient Voltage Suppression Diodes

Temperature (ºC)

V

f

- Typical forward dropped voltage

T

A

V

C

j

(pf)

Surface Mount – 200W > SMF Series

Ratings and Characteristic Curves (T

=25°C unless otherwise noted) (Continued)

A

Figure 3 - Pulse Derating Curve

100

)

PP

80

60

) or Current (I

PP

40

Derating in Percentage %

20

Peak Pulse Power (P

0

0255075 100 125 150 175

-Ambient temperature (ºC)

Figure 5 - Steady State Power Dissipation
Derating Curve

1.50

1.25

1.00

0.75

0.50

0.25

, Steady State Power Dissipation (W)

M(AV)

P

0

0255075 100 125 150 175

TL - Tab temperature (ºC)

Figure 4 - Pulse Waveform - 10/1000µS

150

RSM

100

50

- Peak Pulse Current, % I

PPM

I

0

tr=10µsec

Peak Value
I

PPM

t

d

0

1.0 2.0 3.0 4.0

Half Value

I

I

PPM

( )

TJ=25°C
Pulse Width(td) is defined
as the point where the peak
current decays to 50% of I

PPM

2

10/1000µsec. Waveform
as defined by R.E.A

t-Time (ms)

Figure 6 - Forward Voltage

0.9

0.8

0.7

0.6

0.5

0.4

0

-551075140

PPM

Figure 7 - Cj vs. Working Peak Reverse Voltage

10000

1000

100

10

Measured@Vr=0v

Measured@50%Vr

110 100

- Reverse breakdown voltage

br

Specifications are subject to change without notice.

© 2014 Littelfuse, Inc.

Revised: 01/20/14

Transient Voltage Suppression Diodes

A

B

C

D

E

E

F

H

G

1.6 (0.062)

1.3 (0.051)

1.4 (0.055)

Mounting Pad Layout

Surface Mount – 200W > SMF Series

Soldering Parameters

Reflow Condition Lead–free assembly

- Temperature Min (T

Pre Heat

- Temperature Max (T

- Time (min to max) (ts) 60 – 180 secs

Average ramp up rate (Liquidus Temp
(T

) to peak

L

to TL - Ramp-up Rate 3°C/second max

T

S(max)

Reflow

- Temperature (TL) (Liquidus) 217°C

- Time (min to max) (ts) 60 – 150 seconds

Peak Temperature (TP) 260

Time within 5°C of actual peak
Temperature (t

)

p

Ramp-down Rate 6°C/second max

Time 25°C to peak Temperature (T

Do not exceed 260°C

) 150°C

s(min)

) 200°C

s(max)

3°C/second max

+0/-5

°C

20 – 40 seconds

) 8 minutes Max.

P

T

P

Ramp-up Critical Zone

T

L

T

s(max)

T

s(min)

Temperature (T)

25˚C

t

s

Preheat

t 25˚C to Peak

Time (t)

Environmental Specifications

High Temp. Storage JESD22-A103

t

p

T

T

to

L

t

L

P

Ramp-down

Physical Specifications

Case

Polarity Color band denotes cathode except bipolar

Terminal

SOD-123F plastic over glass passivated

junction

Matte tin-plated leads, solderable per
JESD22-B102

Dimensions - SOD-123F Package

HTRB JESD22-A108

Temperature Cycling JESD22-A104

MSL JEDEC-J-STD-020, Level 1

H3TRB JESD22-A101

RSH JESD22-B106

Dimensions

Millimeters Inches

Min Max Min Max

A 2.50 2.90 0.0984 0.1142

B 3.40 3.90 0.1339 0.1535

C 0.70 1.20 0.0275 0.0472

D 1.50 2.00 0.0591 0.0787

E 0.35 0.90 0.0138 0.0354

F 0.05 0.26 0.0020 0.0102

G 0.00 0.10 0.0000 0.0039

H 0.95 1. 1 0 0.0374 0.0433

© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 01/20/14

Transient Voltage Suppression Diodes

V

R

VOLTA GE

5%

V

BR

VOLTA GE TOLERANCE

SMF xx A

SERIES

XX

Marking Code

e BanddohtaC

L

F

YM

Trace Code Marking

Y:Year Code
M: Month Code

(for uni-directional products only)

0.31
(8.0)

0.157
(4.0)

0.157
(4.0)

0.33
(8.5)

0.80 (20.2)

Arbor Hole Dia.

Optional

7” 7.0 (178)

13” 13.0 (330)

Dimensions are in inches
(and millimeters).

Direction of Feed

0.059
DIA

(1.5)

Cover tape

Surface Mount – 200W > SMF Series

Part Numbering System

Part Marking System

Packaging Options

Part number

Component

Package

Quantity

SMFXXX SOD-123F 3000 Tape & Reel – 8mm tape/7” reel EIA RS-481

SMFXXX-T13 SOD-123F 10000 Tape & Reel – 8mm tape/13” reel EIA RS-481

Packaging

Option

Packaging

Specification

Tape and Reel Specification

Cathode

Specifications are subject to change without notice.

© 2014 Littelfuse, Inc.

Revised: 01/20/14