![0438001.WR — Fuse, Surface Mount, 1 A, Fast Acting, 63 V, 0603 [1608 Metric], 438 Series](/media/F/1/B/7ED41E4BD2E80B1F.webp)
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0438001.WR
Fuse, Surface Mount, 1 A, Fast Acting, 63 V, 0603 [1608 Metric], 438 Series
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- Manufacturer: LITTELFUSE
- Product type: SMD Fuses
- SVHC: To Be Advised
- Fuse Current: 1A
- Product Range: 438 Series
- Fuse Case Style: 0603 [1608 Metric]
- Voltage Rating VAC: -
- Voltage Rating VDC: 63V
- Blow Characteristic: Fast Acting
- Breaking Capacity Current AC: 50A
- Breaking Capacity Current DC: 50A
| Delivery and price | |
|---|---|
| Units per pack | 3000 |
| Price | 0.641 € |
| Current stock | 100+ |
| Lead time | 30 days |
Datasheet
**Surface Mount Fuses** Ceramic Fuse > 438 Series **RoH** ~~**S P**~~ **b** ~~(_IOuF A G,~~ ## 438 Series – 0603 Fast-Acting Fuse ## ~~**Description** [oT~~ The 438 Series is a 100% Lead-free, RoHS compliant and Halogen-free fuse series designed specifically to provide over-current protection to circuits that operate under high working ambient temperature up to 150ºC. 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. ## ~~**Features** [oT~~ ## ~~**Agency Approvals** [Lo~~ AGENCY AGENCY FILE NUMBER AMPERE RANGE AW E10480 0.250A – 6A 29862 0.250A – 6A - Operating Temperature • Suitable for both leaded from -55ºC to +150ºC and lead-free reflow / wave soldering - • 100% Lead-free, RoHS compliant and Halogenfree ## ~~**Applications** [oT~~ - Handheld Electronics • Hard Disk Drives - LCD Displays • SD Memory Cards - Battery Packs Battery Packs ~~**Electrical Characteristics for Series** Lo~~ % of Ampere **Additional Information** Ampere Rating Opening Time at 25ºC Rating 100% 0.250A – 6A 4 Hours, Minimum 250% 0.250A – 6A 5 Seconds, Maximum e ~~——— [~~ **Datasheet Resources Samples** ~~**Electrical Specifcations by Item** Lo~~ |Ampere<br>Rating<br>(A)<br>Amp<br>Code<br>Max.<br>Voltage<br>Rating (V)<br>Interrupting Rating<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>0.25<br>.250<br>63VDC<br>50A @ 63VDC<br>50A @ 32VAC<br>2.218<br>0.0017<br>0.550<br>0.138<br>x<br>x<br>0.375<br>.375<br>63VDC<br>1.247<br>0.0041<br>0.488<br>0.183<br>x<br>x<br>0.5<br>.500<br>63VDC<br>0.829<br>0.0100<br>0.486<br>0.243<br>x<br>x<br>0.75<br>.750<br>63VDC<br>0.466<br>0.0281<br>0.378<br>0.284<br>x<br>x<br>1<br>001.<br>63VDC<br>0.310<br>0.0593<br>0.351<br>0.351<br>x<br>x<br>1.25<br>1.25<br>63VDC<br>0.200<br>0.0510<br>0.365<br>0.456<br>x<br>x<br>1.5<br>01.5<br>63VDC<br>0.174<br>0.0902<br>0.368<br>0.552<br>x<br>x<br>1.75<br>1.75<br>63VDC<br>1.405<br>0.1440<br>0.360<br>0.540<br>x<br>x<br>2<br>002.<br>32<br>50A @ 32VDC/12VAC<br>0.051<br>0.1490<br>0.107<br>0.214<br>x<br>x<br>2.5<br>02.5<br>32<br>0.0324<br>0.1977<br>0.095<br>0.238<br>x<br>x<br>3<br>003.<br>32<br>0.0255<br>0.2922<br>0.093<br>0.279<br>x<br>x<br>3.5<br>03.5<br>32<br>0.0205<br>0.4752<br>0.082<br>0.287<br>x<br>x<br>4<br>004.<br>32<br>0.0170<br>0.6920<br>0.079<br>0.316<br>x<br>x<br>5<br>005.<br>32<br>0.0115<br>0.7398<br>0.074<br>0.370<br>x<br>x<br>6<br>006.<br>24<br>50A @ 24VDC/12VAC<br>0.0085<br>1.3838<br>0.072<br>0.432<br>x<br>x<br>~~P|~~<br>~~A | G.~~<br>~~| |~~<br>~~a~~<br>~~ee~~<br>~~|~~<br>|<br>~~a~~<br>~~ee~~<br>~~ee~~<br>~~| |~~<br>~~a~~<br>~~ee~~<br>~~a~~<br>~~| |~~<br>~~a~~<br>~~le~~<br>~~|~~<br>~~|~~<br>~~a~~<br>~~ee~~<br>~~a~~<br>~~|~~<br>~~|~~<br>~~a~~<br>~~ee~~<br>~~a~~<br>~~|~~<br>~~|~~<br>~~a~~<br>~~So SSS~~<br>~~=~~<br>~~| |~~<br>~~a ee~~<br>~~aQQ~~<br>~~QO~~| |---| |Notes:| |1. AC Interrupting Rating tested at rated voltage with unity power factor. DC Interrupting<br>Devices designed to carry rated current for 4 hours minimum. It is recommended that| |Rating tested at rated voltage with time constant < 0.8 msec.<br>devices be operated continuously at no more than 80% rated current. See “Temperature| 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. 2. Nominal Resistance measured with < 10% rated current. Devices designed to be mounted with marking code facing up. 3. Nominal Melting I²t measured at 1 msec. opening time. 4. Nominal Voltage Drop measured at rated current after temperature has stabilized. © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Application testing is strongly recommendedSpecifications are subject to change without notice **.** Revised: 05/25/15 **Surface Mount Fuses** Ceramic Fuse > 438 Series **==> picture [93 x 32] intentionally omitted <==** **==> picture [261 x 19] intentionally omitted <==** **----- Start of picture text -----**<br> Temperature Re-rating Curve<br>**----- End of picture text -----**<br> **==> picture [243 x 167] intentionally omitted <==** **----- Start of picture text -----**<br> 140<br>120<br>100<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 ## ~~**Average Time Current Curves**~~ **==> picture [243 x 294] intentionally omitted <==** **----- Start of picture text -----**<br> 100<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 3A 3.5A 4A 5A 6A<br>TIME IN SECONDS<br>**----- End of picture text -----**<br> ## ~~**Soldering Parameters**~~ |Refow Condition<br>Pre Heat<br>- Temperature Min (Ts(min))<br>- Temperature Max (Ts(max))<br>- Time (Min to Max) (ts)<br>Average Ramp-up Rate (Liquidus Temp<br>(TL) to peak)|Pb – free assembly<br>150°C<br>200°C<br>60 – 180 seconds<br>3°C/second max.| |---|---| |TS(max)to TL- Ramp-up Rate|5°C/second max.| |Refow<br>- Temperature (TL) (Liquidus)<br>- Temperature (tL)|217°C<br>60 – 150 seconds| |Peak Temperature (TP)|260+0/-5°C| |Time within 5°C of actual peak<br>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| ||| |Wave Soldering<br>260°C, 10 seconds max.|| **==> picture [244 x 151] 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> © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 05/25/15 **Surface Mount Fuses** Ceramic Fuse > 438 Series **==> picture [94 x 32] intentionally omitted <==** ## ~~**Product Characteristics**~~ |**Materials**<br>**Moisture**<br>**Sensitivity Level**|**Body:**Advanced Ceramic<br>**Terminations:**Ag / Ni / Sn (100% Lead-free)<br>**Element Cover Coating:**Lead-free Glass<br>IPC/JEDEC J-STD-020, Level 1| |---|---| |**Solderability**|IPC/EIC/JEDEC J-STD-002, Condition B| |**Humidity**|MIL-STD-202, Method 103, Conditions D| |**Resistance to**<br>**Solder Heat**|MIL-STD-202, Method 210, Condition B| |**Moisture Resistance**|MIL-STD-202, Method 106| |---|---| |**Thermal Shock**|MIL-STD-202, Method 107,<br>Condition B-3| |**Mechanical Shock**|MIL-STD-202, Method 213,<br>Condition A| |**Vibration**|MIL-STD-202, Method 201| |**Vibration,**|MIL-STD-202, Method 204,| |**High Frequency**|Condition D| |**Dissolution of**|IPC/EIC/JEDEC J-STD-002,| |**Metallization**|Condition D| |**Terminal Strength**|IEC 60127-4| **==> picture [522 x 449] intentionally omitted <==** **----- Start of picture text -----**<br> Dimensions Part Marking System<br>0.530 +/- 0.150 1.54 ± 0.150 Amp Code Marking Code<br>[0.021 +/- 0.006] [0.061 ± 0.006] .250 D<br>.375 E<br>0.85 ± 0.150 .500 F<br>[0.033 ± 0.006] .750 G<br>001. H<br>1.25 J<br>01.5 K<br>0.502 ± 0.080 1.75 L<br>[0.020 ± 0.003]<br>002. N<br>02.5 O<br>003. P<br>03.5 R<br>004. S<br>005. T<br>006. U<br>0.432 +/- 0.150<br>[0.017 +/- 0.006]<br>0.60 0.74 Part Numbering System<br>[0.024] [0.029]<br>0438 005. W R<br>SERIES<br>1.00<br>[0.039] PACKING CODE<br>AMP CODE R = Reel Pack<br>1.94<br>[0.076] QUANTITY CODE<br>W = 3000 pcs<br>Packaging<br>Quantity &<br>Packaging Option Packaging Specification Quantity<br> Packaging Code<br>8mm Tape and Reel EIA-481, IEC 60286, Part 3 3000 WR<br>**----- End of picture text -----**<br> © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 05/25/15
Updated at June 9, 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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