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Special Application Fuses

Intrinsically Safe > Surface Mount > 308 Series

308 Series 30V Intrinsically Safe Fuse

Pb RoHS

Agency Approvals

Agency

Agency File Number

DEMKO 15 ATEX 1439U

II 1 G Ex ia IIC

E358130

IECEx UL 15.0011U

Ex ia IIC

Ampere Rating

0.250A – 1.5A

Reference Standards

Certification

ATEX

IECEx

cUL

Standards

EN 60079-0, EN 60079-11

IEC 60079-0, IEC 60079-11

UL 913, UL 60079-0,

UL 60079-11

CAN/CSA C22.2 No. 157,

CAN/CSA C22.2 No. 60079-0,

CAN/CSA C22.2 No. 60079-11

Description

The 308 Series offers a range of surface mountable

encapsulated fuses certified as intrinsically safe components

that can be used in hazardous locations. Ideal for use in oil,

gas, mine, chemical, pharmaceutical and process industries,

the 308 Series surface mountable fuse was designed to limit

the energy and temperature generated during its operation.

The fuse design and its encapsulant are suitable for use in

intrinsically safe apparatus and associated apparatus for peak

voltage not exceeding 30V.

Features

• Surface Mountable

• Encapsulated and sealed

(0.7mm minimum)

• Designed for operation in

a range of hazardous area

applications requiring

30V peak

• RoHS compliant

and Pb-Free

• Fully compatible with

lead-free solder alloys and

higher temperature profiles

associated with lead-free

assembly

• Global hazardous locaiton

(haz loc) certificaitons

Applications

• Testing, measuring or

processing electronic and

electrical equipment

• Motor controllers

• Communication handsets/

two-way radios

• Process control and

automation

• Sensors

• Lighting

• Flow/gas meters

Electrical Characteristics for Series

% of Ampere Rating

100%

250%*

350%**

* Applicable to 750mA - 1.5A

** Applicable to 250mA - 1.5A

Opening Time

4 Hours, Minimum

120 Seconds, Maximum

60 Seconds, Maximum

Electrical Specifications by Items

Catalog

Number

Ampere

Rating

(A)

Amp Code

Interrupting

Rating

Nominal

Melting

I2t (A2 Sec.)

Minimum Cold

Resistance at

-20°C (Ohms)

Minimum Cold

Resistance at

-40°C (Ohms)

0308.250

0308.375

0308.500

0308.750

0308001.

03081.25

030801.5

0.250

0.375

0.500

0.750

1.00

1.25

1.50

.250

.375

.500

.750

001.

1.25

01.5

50A@24VAC

50A@30VDC

0.004

0.010

0.022

0.048

0.100

0.220

0.3

1.856

1.022

0.712

0.520

0.226

0.240

0.182

1.821

1.006

0.676

0.511

0.216

0.236

0.144

Notes:

1. The fuse must be mounted so that creepage and clearance distances aren’t impaired in any way.

2. The fuse is suitable for use in intrinsically safe equipment and associated apparatus for voltage not exceeding 30V peak.

3. Maximum surface temperature rise at 170% rated current: 250-375mA = 23°C, 500mA = 35°C, 750mA = 53°C, 1A = 38°C, 1.25-1.50A = 96°C.

4. Minimum Cold Resistance at -30°C is available upon request.

Nominal Cold

Resistance at

25°C (Ohms)

2.290

1.330

0.908

0.665

0.420

0.318

0.209

Agency Approvals

X XX

Specifications are subject to change without notice.

Revised: 12/04/19

No Preview Available !

Special Application Fuses

Intrinsically Safe > Surface Mount > 308 Series

Temperature Rerating Curve

140

120

100

-85 -65 -45 -25 -5 15 35 55 75 95 115 135 155

TEMPERATURE (ºC)

Notes:

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

Example:

For continuous operation at 55°C, the fuse should be rerated as follows:

I = (0.80)(0.90)IRAT = (0.72)IRAT

2. The temperature rerating curve represents the nominal conditions. For questions about temperature

rerating curve, please consult Littelfuse technical support for assistance.

Average Time Current Curves

100.000

10.000

1.000

0.100

Soldering Parameters

Reflow Condition

- Temperature Min (Ts(min))

Pre Heat

- Temperature Max (Ts(max))

- Time (Min to Max) (ts)

Average ramp up rate (Liquidus Temp (TL) to peak

TS(max) to TL - Ramp-up Rate

Reflow

- Temperature (TL) (Liquidus)

- Temperature (tL)

Peak Temperature (TP)

Time within 5°C of actual peak Temperature (tp)

Ramp-down Rate

Time 25°C to peak Temperature (TP)

Do not exceed

Pb – Free assembly

150°C

200°C

60 – 180 secs

3°C/second max.

217°C

60 – 150 seconds

260+0/–5 °C

30 Sec Max

6°C/second max.

8 minutes max.

0.010

0.001

0.01

0.1 1

Current in Ampers

100

TS(max)

Ramp-up

TS(min)

Preheat

time to peak temperature

(t 25ºC to peak)

Critical Zone

TL to TP

Ramp-down

Time

Specifications are subject to change without notice.

Revised: 12/04/19

No Preview Available !

Special Application Fuses

Intrinsically Safe > Surface Mount > 308 Series

Dimensions (mm)

GATE

SEE MARKING CODE

5.40 +-00.1.042

3.80 +-00.1.145

Part Marking System

Amp Code

0.250

0.375

0.500

0.750

001.0

1.25

01.5

Marking Code

+0.50

-0.20

RECOMMENDED PCB LAND PATTERN

2.45

0. 20 MIN

2.34

2.04 [REF]

2.0

Part Numbering System

0308 001. U R

Series

Amp Code

Refer to Electrical

Specifications table

Quantity Code

U = 500 pcs

Packaging code

R = Tape and Reel

Packaging

Packaging Option

12mm Tape and Reel

Packaging

Specification

EIA 481-1

Quantity

500

Quantity and

Packaging Code

Product Characteristics

Molding Material

Ambient Temperature 1 2

Terminations

Thermal Shock

Vibration

Mechanical Shock

Moisture Resistance

Salt Spray

Resistance to Soldering

Heat

Polyamide 6T/66

CTI 100 volts minimum

Continuous Operating Temperature: 140°C

-40°C to +70°C

Tin-Plated Silver-Plated Copper

Withstands 100 cycles of -55°C to 125°C

MIL-STD-202, Method 201

MIL-STD-202, Method 213, Condition A

MIL-STD-202, Method 106

MIL-STD-202, Method 101, Condition B

MIL-STD-202, Method 210, Condition K

Notes:

1. Any use of the 308 Series fuse outside of the ambient temperature range specified in the table is subject to

additional investigation.

2. Specified ambient temperature range is for intrinsic safety certification.

Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own 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.

Specifications are subject to change without notice.

Revised: 12/04/19