MF-PSHT Series - PTC Resettable Fuses

Specifications are subject to change without notice.

Users should verify actual device performance in their specific applications.

The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.

Packaging Quantity

3000 pcs. per reel

How to Order

MF - PSHT 010 K X - 2

Multifuse® Product

Designator

Series

PSHT = 0805 High Temp.

Surface Mount

Component

Hold Current, Ihold

005 - 050 (0.05 - 0.50 Amps)

Material Specific Code

Multifuse® freeXpansion™ Design

Packaging

-2 = Tape and Reel

Packaged per EIA-481

Typical Part Marking

Represents total content. Layout may vary.

PART IDENTIFICATION:

MF-PSHT005KX = C

MF-PSHT010KX = D

MF-PSHT016KX = I

MF-PSHT020KX = K

MF-PSHT035KX = H

MF-PSHT050KX = L

BIWEEKLY DATE CODE WILL APPEAR ON THE PACKAGING LABEL:

WEEK 1 AND 2 = A

WEEK 51 AND 52 = Z

K

Solder Reflow Recommendations

Notes:

• MF-PSHT models are intended for reflow soldering (including, but not

limited to heating plate, hot air, IR, nitrogen, and vapor phase).

• Wave soldering is permissible only if the device is on the top of the

PCB, opposite the heat source.

• Hand soldering is not recommended for these devices.

• All temperatures refer to the topside of the device, measured on the

device body surface.

• If reflow temperatures exceed the recommended profile, devices may

not meet the published specifications.

• Compatible with Pb and Pb-free solder reflow profiles.

• Excess solder may cause a short circuit.

• Please refer to the Multifuse® Polymer PTC Resettable Fuse Soldering

Recommendations for more details.

Temperature of Lead/Pad Junction

Process

Materials

Temperature

Time

Description

Interval

1. Apply solder paste to

• Sn 96.5 / Ag 3.0 / Cu 0.5

Room temperature

test board (8 - 10 mil thick)

Alloy water soluble or no

clean solder paste

(see note 1)

• single sided epoxy glass

(G10) (UL approved)

• PC board approx. 4x4x.06 in.

2. Place test units onto board

6 units/board

3. Ramp up

Convection oven

(see note 2)

2.5 °C ± 0.5 °/sec.

4. Preheat (TS

.

c

e

s

0

3

±

0

9

C

°

0

9

1

o

t

C

°

0

5

1

)

5. Time above liquidus (TL

.

c

e

s

0

9

-

0

6

C

°

0

2

2

)

6. Peak temperature (TP

°

5

-

/

°

0

+

C

°

0

5

2

)

10-20 sec. within

5 °C of peak

.

c

e

s

/

C

°

5

.

0

±

C

°

3

e

r

u

t

a

r

e

p

m

e

t

m

o

o

R

n

w

o

d

p

m

a

R

.

7

(see note 2)

8. Cleaning water clean profile High pressure deionized

72 °F to 160 °F

As required

water 65 PSI max.

(22 °C to 71 °C)

Inspect solder joint to determine if solder joint is

acceptable (i.e. exhibits wetting of joint’s surface).

Use the following criteria (ref. acceptability of printed

board assemblies, IPC-A-610):

A) Acceptable (see Figure 1)

(1) The solder connection wetting angle (solder to

component and solder to PCB termination)

does not exceed 90 °.

(2) Solder balls that do not violate minimum

electrical clearances and are attached

(soldered) to a metal surface.

B) Unacceptable (see Figure 2)

(1) Solder connection wetting angle exceeding

90 °.

(2) Incomplete reflow of solder paste.

(3) Dewetting.

If unacceptable, determine cause and correct prior to

next run.

NOTES:

1. Water soluble solder paste only above 100K.

2. Refer to ref. temperature profile. Temperature at

lead/pad junction with “K” type thermocouple.

3. Units that are board mounted for environmental

testing must see a peak temperature in the reflow

zone, as specified. This is to ensure that all test

units will see “worst case conditions”.

4. Ramp down rate to be measured from 245 °C to

150 °C.

5. Process Description 8 does not apply to open

frame trimmers.

(Derived using 6-zone Convection Oven)

TP

TP

tp

ts

T TO

RAMP-UP

L

TL

t L

25

Ts max

Ts min

PREHEAT

Time

CRITICAL ZONE

RAMP-DOWN

t 25 °C TO PEAK

Profile Feature

Pb-Free Assembly

Average Ramp-Up Rate (Tsmax to Tp)

3 °C / second max.

PREHEAT:

Temperature Min. (Tsmin)

Temperature Max. (Tsmax)

Time (Tsmin to Tsmax) (ts)

150 °C

200 °C

60~180 seconds

TIME MAINTAINED ABOVE:

Temperature (TL)

Time (tL)

217 °C

60~150 seconds

Peak Temperature (Tp)

260 °C

Time within 5 °C of Actual Peak Temperature (tp)

20~40 seconds

Ramp-Down Rate

6 °C / second max.

Time 25 °C to Peak Temperature

8 minutes max.