0438.750WRA - LITTELFUSE - Datasheet.Directory

Speciﬁcations are subject to change without notice.

Revised: 10/11/19

Surface Mount Fuses

Ceramic Fuse > 438A Series

438A Series – 0603 Fast-Acting Fuse

Description

The 438A series AECQ-compliant fuses are speciﬁcally

tested to cater secondary circuit protection needs of

compact auto electronics application.

The general design ensures excellent temperature stability

and performance reliability.

The high I²t values which is typical in the Littelfuse ceramic

fuse family ensure high inrush current withstand capability.

Agency Approvals

Agency Agency File Number Ampere Range

E10480 0.25A – 6A

29862 0.25A – 6A

Features

Electrical Characteristics for Series

• Operating Temperature

from -55ºC to +150ºC

• 100% Lead-free, RoHS

compliant and Halogen-

free

• Suitable for both leaded

and lead-free reﬂow/wave

soldering

• Meets Littelfuse's

Automotive qualiﬁcations*

• Recognized to UL/CSA/

NMX 248-1 and UL/CSA/

NMX 248-14

% of Ampere

Rating Ampere Rating Opening Time at 25ºC

100% 0.250A – 6A 4 Hours, Minimum

250% 0.250A – 6A 5 Seconds, Maximum

Applications

Ampere

Rating

(A)

Amp

Code

Max.

Voltage

Rating (V)

Interrupting Rating

(AC/DC)1

Nominal

Resistance

(Ohms)2

Nominal

Melting I2t

(A2Sec.)3

Nominal Voltage

Drop At Rated

Current (V)4

Nominal Power

Dissipation At Rated

Current (W)

Agency Approvals

0.25 .250 63VDC

50A @ 63VDC

50A @ 32VAC

2.218 0.0017 0.550 0.138 x x

0.375 .375 63VDC 1.247 0.0041 0.488 0.183 x x

0.5 .500 63VDC 0.829 0.0100 0.486 0.243 x x

0.75 .750 63VDC 0.466 0.0281 0.378 0.284 x x

10 01. 63VDC 0.310 0.0593 0.351 0.351 x x

1.25 1.25 63VDC 0.200 0.0510 0.365 0.456 x x

1.75 1.75 32VDC 50A@32VAC/32VDC 0.1405 0.1440 0.360 0.540 x x

2 002. 32

50A @ 32VDC/12VAC

0.0490 0.181 0.107 0.214 x x

2.5 02.5 32 0.0364 0.240 0.095 0.238 x x

3 003. 32 0.0264 0.439 0.093 0.279 x x

3.5 03.5 32 0.0210 0.647 0.082 0.287 x x

4 004. 32 0.0177 0.730 0.079 0.316 x x

5 005. 32 0.0127 0.747 0.074 0.370 x x

6 006. 24 50A @ 24VDC/12VAC 0.0086 1.444 0.072 0.432 x x

Electrical Speciﬁcations by Item

Notes:

1. AC Interrupting Rating tested at rated voltage with unity power factor. DC Interrupting Rating tested at rated

voltage with time constant < 0.8 msec.

2. Nominal Resistance measured with < 10% rated current.

3. Nominal Melting I²t measured at 1 msec. opening time.

RoHS

• Li-ion Battery

• LED Head-Lights

• Automotive Navigation

System

• TFT Display

• Battery Management

System (BMS)

• Clusters

4. Nominal Voltage Drop measured at rated current after temperature has stabilized.

Devices designed to carry rated current for 4 hours minimum. It is recommended that devices be operated

continuously at no more than 80% rated current. See “Temperature Re-rating Curve”for additional re-rating

information.

Devices designed to be mounted with marking code facing up.

* Largely based on Littelfuse internal AECQ-200 test plan.

Additional Information

Datasheet Samples

Resources

Speciﬁcations are subject to change without notice.

Revised: 10/11/19

Surface Mount Fuses

Ceramic Fuse > 438A Series

Average Time Current Curves

0.001

0.01

0.1

100

.250A

3.5A

2.5A

1.75A

1.25A

.500A

.375A

.750A

TIME IN SECONDS

0.1110 100

CURRENT IN AMPERES

Reﬂow Condition Pb – free assembly

Pre Heat

- Temperature Min (Ts(min))150°C

- Temperature Max (Ts(max))200°C

- Time (Min to Max) (ts)60 – 180 seconds

Average Ramp-up Rate (Liquidus Temp (TL) to peak) 3°C/second max.

TS(max) to TL - Ramp-up Rate 5°C/second max.

Reﬂow - Temperature (TL) (Liquidus) 217°C

- Temperature (tL)60 – 150 seconds

Peak Temperature (TP)260+0/-5 °C

Time within 5°C of actual peak Temperature (tp)10 – 30 seconds

Ramp-down Rate 6°C/second max.

Time 25°C to peak Temperature (TP)8 minutes max.

Do not exceed 260°C

Soldering Parameters

Temperature Re-rating Curve

100

120

140

-65 -45 -25 -5 15 35 55 75 95 115 135 15 5

TEMPERATURE (°C)

PERCENT OF RATING

Example:

For continuous operation at 75 degrees celsius, the fuse should be rerated as follows:

I = (0.80)(0.85)IRAT = (0.68)IRAT

Note:

1. Re-rating depicted in this curve is in addition to the standard re-rating of 20% for continuous operation.

Wave Soldering 260°C, 10 seconds max.

Time

Temperature

TS(max)

TS(min)

time to peak temperature

(t 25ºC to peak)

Ramp-down

Ramp-up

Preheat

Critical Zone

TL to TP

Speciﬁcations are subject to change without notice.

Revised: 10/11/19

Surface Mount Fuses

Ceramic Fuse > 438A Series

Materials

Body: Advanced Ceramic

Terminations: Ag/Ni/Sn (100% Lead-free)

Element Cover Coating: Lead-free Glass

Moisture Sensitivity Level IPC/JEDEC J-STD-020, Level 1

Solderability IPC/EIC/JEDEC J-STD-002, Condition C

Humidity Test MIL-STD-202, Method 103, Conditions D

Resistance to Solder Heat MIL-STD-202, Method 210, Condition B

Moisture Resistance MIL-STD-202, Method 106

High Temperature Storage MIL-STD-202 Method 108 with exemptions

Thermal Shock Test JESD22 Method JA-104,

Test Conditions B and N

Biased Humidity MIL-STD-202 Method 103, 85°C/85% RH

with 10% operating power for 1000 hrs

Operational Life MIL-STD-202 Method 108, Test Condition D

Resistance To Solvents MIL-STD-202 Method 215

Mechanical Shock MIL-STD-202 Method 213, Test Condition C

Thermal Shock MIL-STD-202, Method 107, Condition B

Mechanical Shock MIL-STD-202, Method 213, Condition A

Vibration MIL-STD-202, Method 201

Vibration, High Frequency MIL-STD-202, Method 204, Condition D

Dissolution of Metallization IPC/EIC/JEDEC J-STD-002, Condition D

Terminal Strength IEC 60127-4

High Frequency Vibration MIL-STD-202, Method 204

Resistance To Soldering

Heat MIL-STD-202 Method 210, Test Condition B

Solderability JESD22-B102E Method 1

Terminal Strength For SMD AEC Q200-006

Board Flex AEC Q200-005

Electrical Characterization 3 Temperature Electrical Characterization

Product Characteristics

Dimensions

1.575±0.152

[0.062 ± 0.006]

0.74

[0.029]

1.00

[0.039]

1.94

[0.076]

0.60

[0.024]

0.508±0.102

[0.02±0.004]

0.530 +/- 0.150

[0.021 +/- 0.006]

0.85 ± 0.150

[0.033 ± 0.006]

0.432 +/- 0.150

[0.017 +/- 0.006]

Part Marking System

Part Numbering System

0438 005. W R A

Series

Amp Code

Quantity Code

Packing Code

AEC-Q200 Qualiﬁed

R = Reel Pack

Amp Code Marking Code

.250 D

.375 E

.500 F

.750 G

0 01. H

1.25 J

1.75 L

002. N

02.5 O

003. P

03.5 R

004. S

005. T

006. U

Packaging

Packaging Option Packaging Speciﬁcation Quantity Quantity & Packaging Code

8mm Tape and Reel EIA-481, IEC 60286, Part 3 3000 WR

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applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at: www.littelfuse.com/disclaimer-electronics.