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0437.375WR.
FUSE, SMD, 375mA, 1206, FAST ACTING
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- Manufacturer: LITTELFUSE
- Product type: SMD Fuses
- Fuse Current:375mA; Blow Characteristic:Fast Acting; Voltage Rating VAC:125VAC; Voltage Rating VDC:125VDC; Fuse Case Style:1206 ^3216 Metric]; Product Range:437 Se 01P9236
- Voltage Rating VAC: 125VAC
- Voltage Rating VDC: 125V
| Delivery and price | |
|---|---|
| Units per pack | 3000 |
| Price | 0.707 € |
| Current stock | 10+ |
| Lead time | 30 days |
Datasheet
**Surface Mount Fuses** Ceramic Fuse > 437 Series **RoHS P** ~~**b** [_IQHF Ads @,~~ ## 437 Series – 1206 Fast-Acting Fu ~~se~~ ## ~~**Description** [oT~~ This 100% Lead-free, RoHS compliant and Halogen-free fuse series has been designed specifically to provide over current protection to circuits that see high working ambient temperatures (up to 150ºC). The general design ensures excellent temperature stability and performance reliability. In addition to this, the high I²t values typical of the Littelfuse Ceramic Fuse family ensure high inrush current withstand capability. ## ~~**Features** Lo~~ ## ~~**Agency Approvals** Lo~~ - Operating Temperature • Suitable for both leaded from -55ºC to +150ºC and lead-free reflow / wave soldering - • 100% Lead-free, HalogenFree and RoHS compliant |AGENCY<br>AGENCY FILE NUMBER|AMPERE RANGE| |---|---| |E10480<br>29862<br>cis<br>G,|0.250A ~ 8A<br>0.250A ~ 8A| ||| |~~**Electrical Characteristics for Series**~~<br>% of Ampere<br>Rating<br>Ampere Rating<br>Opening Time at 25ºC<br>100%<br>250mA - 8A<br>4 hours, Minimum<br>250%<br>750mA - 8A<br>5 seconds, Maximum<br>350%<br>250mA -500mA<br>5 seconds, Maximum<br>350%<br>750mA - 8A<br>1 second, Maximum<br>~~Lo~~<br>~~oe~~|| ## ~~**Applications** [Po~~ - LCD Displays - Scanners - Servers • Data Modems • Printers - **Additional Information Datasheet Resources Samples** a **Samples** a **==> picture [101 x 8] intentionally omitted <==** **----- Start of picture text -----**<br> Additional Information<br>**----- End of picture text -----**<br> |~~**Electrical Specif**~~**i**~~**cations by Item**~~<br>~~Lo~~| |---| |Ampere<br>Rating<br>(A)<br>Amp<br>Code<br>Max.<br>Voltage<br>Rating (V)<br>Interrupting Rating1<br>Nominal<br>Resistance<br>(Ohms)2<br>Nominal<br>Melting I2t<br>(A2Sec.)3<br>Nominal Voltage<br>Drop At Rated<br>Current (V)4<br>Nominal Power<br>Dissipation At<br>Rated Current (W)<br>Agency Approvals<br>250mA<br>.250<br>125<br>50 A @ 125 V AC/DC<br>2.290<br>0.003<br>0.78<br>0.195<br>x<br>x<br>375mA<br>.375<br>125<br>1.330<br>0.010<br>0.60<br>0.225<br>x<br>x<br>500mA<br>.500<br>63<br>50 A @ 63 V AC/DC<br>0.908<br>0.018<br>0.52<br>0.260<br>x<br>x<br>750mA<br>.750<br>63<br>0.665<br>0.064<br>0.45<br>0.338<br>x<br>x<br>1A<br>001.<br>63<br>0.420<br>0.100<br>0.41<br>0.410<br>x<br>x<br>1.25A<br>1.25<br>63<br>0.318<br>0.256<br>0.40<br>0.500<br>x<br>x<br>1.5A<br>01.5<br>63<br>0.209<br>0.324<br>0.39<br>0.585<br>x<br>x<br>1.75A<br>1.75<br>63<br>0.071<br>0.075<br>0.27<br>0.473<br>x<br>x<br>2A<br>002.<br>63<br>0.058<br>0.225<br>0.20<br>0.400<br>x<br>x<br>2.5A<br>02.5<br>32<br>50 A @ 32 V AC/35 V DC<br>0.043<br>0.441<br>0.15<br>0.375<br>x<br>x<br>3A<br>003.<br>32<br>0.033<br>0.506<br>0.14<br>0.420<br>x<br>x<br>3.5A<br>03.5<br>32<br>0.027<br>0.777<br>0.13<br>0.455<br>x<br>x<br>4A<br>004.<br>32<br>0.022<br>1.024<br>0.13<br>0.520<br>x<br>x<br>5A<br>005.<br>32<br>0.0159<br>2.30<br>0.13<br>0.650<br>x<br>x<br>7A<br>007.<br>32<br>0.0100<br>5.02<br>0.13<br>0.910<br>x<br>x<br>8A<br>008.<br>32<br>0.008<br>7.23<br>0.13<br>1.040<br>x<br>x<br>~~ES ————E————~~<br>~~| |~~<br>~~a~~<br>~~a~~<br>~~a~~<br>~~|~~<br>~~|~~<br>~~a~~<br>~~|~~<br>~~|~~<br>~~a~~<br>~~|~~<br>~~|~~<br>~~a~~<br>~~== —_==>>=]~~<br>~~|~~<br>~~|~~<br>~~a~~<br>~~|~~<br>~~|~~<br>~~a~~<br>~~|~~<br>~~|~~<br>~~a~~<br>~~| |~~<br>~~a~~<br>~~|~~<br>~~|~~<br>~~a~~<br>~~| |~~<br>~~a~~<br>~~SS~~<br>~~eS S=~~<br>~~| |~~<br>~~a~~<br>~~ee~~<br>~~a~~| |Notes:| |1. AC Interrupting Rating tested at rated voltage with unity power factor. DC Interrupting<br>Rating tested at rated voltage with time constant < 0.8 msec.<br>Devices designed to carry rated current for 4 hours minimum. It is recommended that<br>devices be operated continuously at no more than 80% rated current. See “Temperature| |2. Nominal Resistance measured with < 10% rated current.<br>Re-rating Curve”for additional re-rating information.| |3. Contact Littelfuse if application transient surges are less than 1 ms.<br>Devices designed to be mounted with marking code facing up.| 3. Contact Littelfuse if application transient surges are less than 1 ms. 4. Nominal Voltage Drop measured at rated current after temperature has stabilized. © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Application testing is strongly recommended. Revised: 06/02/17 **Surface Mount Fuses** Ceramic Fuse > 437 Series **==> picture [229 x 171] intentionally omitted <==** **----- Start of picture text -----**<br> Temperature Re-rating Curve<br>140<br>120<br>100 PSE EHH<br>80<br>60<br>40<br>-65 -45 -25 -5 15 35 55 75 95 115 135 155<br>TEMPERATURE (°C)<br>PERCENT OF RATING<br>**----- End of picture text -----**<br> Note: 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 75 degrees celsius, the fuse should be rerated as follows: - I = (0.80)(0.85)IRAT = (0.68)IRAT **==> picture [125 x 9] intentionally omitted <==** **----- Start of picture text -----**<br> Average Time Current Curves<br>**----- End of picture text -----**<br> **==> picture [219 x 229] intentionally omitted <==** **----- Start of picture text -----**<br> 10<br>1<br>0.1<br>0.01<br>0.001<br>0.1 1 10 100<br>CURRENT IN AMPERES<br>.250A .375A .500A .750A 1A 1.25A 1.5A 1.75A 2A 2.5A 3A3.5A 4A 5A 7A 8A<br>TIME IN SECONDS<br>**----- End of picture text -----**<br> ~~**Soldering Parameters**~~ **==> picture [244 x 266] intentionally omitted <==** **----- Start of picture text -----**<br> Reflow Condition Pb – free assembly<br>- Temperature Min (Ts(min)) 150°C<br>Pre Heat - Temperature Max (Ts(max)) 200°C<br>- Time (Min to Max) (ts) 60 – 180 seconds<br>Average Ramp-up Rate (Liquidus Temp<br>3°C/second max.<br>(TL) to peak)<br>TS(max) to TL - Ramp-up Rate 5°C/second max.<br>Reflow - Temperature (TL) (Liquidus) 217°C<br>- Temperature (tL) 60 – 150 seconds<br>Peak Temperature (TP) 260 [+0/-5] °C<br>Time within 5°C of actual peak<br>10 – 30 seconds<br>Temperature (tp)<br>Ramp-down Rate 6°C/second max.<br>Time 25°C to peak Temperature (TP) 8 minutes max.<br>Do not exceed 260°C<br>=<br>Wave Soldering 260°C, 10 seconds max.<br>aie<br>**----- End of picture text -----**<br> **==> picture [226 x 132] intentionally omitted <==** **----- Start of picture text -----**<br> t P<br>T P<br>Critical Zone<br>Ramp-up TL to TP<br>T S(max) T L t L<br>Ramp-down<br>Preheat<br>T S(min)<br>t S<br>25<br>time to peak temperature Time<br>(t 25ºC to peak)<br>Temperature<br>**----- End of picture text -----**<br> 260°C, 10 seconds max. ~~ie~~ © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 06/02/17 **Surface Mount Fuses** Ceramic Fuse > 437 Series **==> picture [93 x 32] intentionally omitted <==** **==> picture [522 x 567] intentionally omitted <==** **----- Start of picture text -----**<br> Product Characteristics<br>Body: Advanced Ceramic MIL-STD-202, Method 107,<br>Thermal Shock<br>Terminations: Ag / Ni / Sn (100% Lead-free) Condition B<br>Materials<br>Element Cover Coating: Ceramic/Lead-free MIL-STD-202, Method 213,<br>Mechanical Shock<br>Glass Condition A<br>Moisture Vibration MIL-STD-202, Method 201<br>IPC/JEDEC J-STD-020, Level 1<br>Sensitivity Level<br>Vibration, MIL-STD-202, Method 204,<br>Solderability IPC/EIC/JEDEC J-STD-002, Condition B High Frequency Condition D<br>Humidity Test MIL-STD-202, Method 103, Condition D Dissolution of IPC/EIC/JEDEC J-STD-002,<br>Metallization Condition D<br>Resistance to<br>MIL-STD-202, Method 210, Condition B<br>Solder Heat Terminal Strength IEC 60127-4<br>Moisture<br>MIL-STD-202, Method 106<br>Resistance Part Marking System<br>Amp Code Marking Code Amp Code Marking Code<br>Dimensions<br>.250 D 002. N<br>3.200 ± 0.1778 .375 E 02.5 O<br>[0.126 ± 0.007]<br>.500 F 003. P<br>.750 G 03.5 R<br>001. H 004. S<br>1.63 +0.10 / -0.2<br>[0.064 +0.004 / -0.008] 1.25 J 005. T<br>N 01.5 K 007. W<br>1.75 L 008. X<br>3.200 ± 0.1778<br>[0.126 ± 0.007]<br>1.000<br>[0.039] Part Numbering System<br>0437 008. W R<br>1.63 +0.10 / -0.2 SERIES<br>[0.064 +0.004 / -0.008]<br>H PACKING CODE<br>AMP CODE R = Reel Pack<br>QUANTITY CODE<br>W = 3000 pcs<br>0.8179 +0.046 / -0.076<br>[0.0322 +0.0018 / -0.003]<br>Packaging<br>0.520 ± 0.200<br>[0.020 ± 0.008]<br>Packaging Packaging Quantity &<br>Quantity<br>1.000 1.500 Option Specification Packaging Code<br>[0.039] [0.059]<br>8mm Tape EIA-481, IEC 3000 WR<br>and Reel 60286-3<br>1.800<br>[0.071]<br>3.500<br>[0.138]<br>**----- End of picture text -----**<br> **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.** © 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 06/02/17
Updated at June 7, 2026
Founded in 1927 and headquartered in Chicago, Illinois, Littelfuse is a premier global manufacturer of circuit protection, power control, and sensing technologies. Widely recognized for pioneering the first small, fast-acting protective fuse, the company has grown into an industry leader whose highly reliable components are essential to modern industrial, transportation, and consumer electronics applications worldwide. At the core of the Littelfuse portfolio is an expansive and industry-leading range of circuit protection solutions. This encompasses a massive selection of traditional fuses, fuse holders, and resettable PTC thermistor fuses designed to safely interrupt overcurrent conditions. To defend against electrical overstress, Littelfuse also provides advanced transient voltage suppression (TVS) technologies, including thousands of specialized TVS diodes, TVS varistors, and gas discharge tubes (GDTs) that ensure robust defense against voltage spikes and environmental hazards. Beyond its foundational protection components, Littelfuse manufactures a diverse array of discrete semiconductors, sensors, and switching devices. Engineers rely on their high-performance thyristors, including TRIACs and SCRs, alongside power-efficient Schottky diodes and MOSFETs for demanding power control applications. Complemented by precision proximity sensors and highly reliable reed and solid-state relays, Littelfuse delivers the critical building blocks required for secure, efficient, and complete system design.
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