273.400
FUSE, PCB, 400mA, 125V, VERY FAST ACTING
- Manufacturer: LITTELFUSE
- Product type: PCB Fuses
- Fuse Current:400mA; Voltage Rating VAC:125V; Product Range:MICRO 273 Series; Voltage Rating VDC:125V; Blow Characteristic:Very Fast Acting; Fuse Case Style:Ra 28F072
- Product Range: MICRO 273 Series
- Voltage Rating VAC: 125VAC
- Voltage Rating VDC: 125VDC
| Delivery and price | |
|---|---|
| Units per pack | 500 |
| Price | 4.23 € |
| Current stock | 100+ |
| Lead time | 30 days |
**Radial Lead Fuses** MICRO™ > Very Fast-Acting Fuse > 272/273/274/278/279 Series ~~**QPL**~~ ## 272/273/274/278/279 Series, MICRO[™] V ~~ery Fast-Acting Fuse~~ ## ~~**Description** Po~~ Developed originally for the U.S. Space Program, MICRO™ fuse provides reliability in a compact design. The MICRO™ fuse is available in plug–in or radial lead styles and a complete range of ampere ratings from 0.002A to 5A to suit a wide variety of design needs. ## ~~**Features**~~ ## ~~**Agency Approvals**~~ - Available from very low ampere of 0.002A to 5A - Military grade available - High breaking capacity - Plug-in with short or long - • Clear cover option to view fuse element status leads option **==> picture [213 x 74] intentionally omitted <==** **----- Start of picture text -----**<br> Agency Agency File Number Ampere Range<br>W E10480 0.002A - 5A<br>29862 0.002A - 5A<br>S<br>QPL FM02 0.002A - 5A<br>**----- End of picture text -----**<br> ## ~~**Applications**~~ • Printed circuit boards • Electronic components and similar equipment ~~**Electrical Characteristics** Po~~ % of Ampere Ampere Rating Opening Time Rating 100% 0.002 – 5 4 Hours, **Min.** 0.002 – 0.3 5 Seconds, **Max.** 200% 0.4 - 5 2 Seconds, **Max.** ## ~~**Electrical Characteristics**~~ **==> picture [506 x 307] intentionally omitted <==** **----- Start of picture text -----**<br> Ampere Amp Code Max Nominal Nominal pO Agency Approvals<br>(for all Voltage Interrupting Cold<br>Rating Melting<br>(A) above Rating Rating Resistance I [2] t (A [2 ] sec) QPL<br>series) (V) (Ohms) W | G<br>.002 rr .002 125 a 2200 0.00000000845 ee X X X<br>.005 a .005 125 es 280 0.0000000766 X X X<br>.010 a .010 125 es 80.0 0.000000462 X X X<br>.015 a .015 125 a 44.0 0.00000123 ee ee X X X<br>.031 a .031 125 es 16.0 0.00000810 X X X<br>.050 a .050 125 es 3.52 0.0000666 X X X<br>.062 a .062 125 es 2.55 0.000115 X X X<br>.100 a .100 125 es 1.38 0.000385 X X X<br>.125 a .125 125 es 1.0 0.000691 X X X<br>.200 a .200 125 a 2.30 0.00409 ee ee X X X<br>.250 a .250 125 es 1.75 0.00640 X X X<br>.300 .300 125 1.25 0.00945 X X X<br>a 10,000A@125VAC/VDC es<br>.400 a .400 125 es 0.227 0.0251 X X X<br>.500 a .500 125 es 0.167 0.0716 X X X<br>.600 a .600 125 es 0.430 0.0411 X X X<br>.700 a .700 125 a 0.324 0.0710 ee ee X X X<br>.750 a .750 125 es 0.293 0.0563 X X X<br>.800 a .800 125 es 0.271 0.113 X X X<br> 1.00 a 001. 125 es 0.0880 0.0648 X X X<br> 01.5 01.5 125 0.0578 0.160 X X X<br> 2.00 a 002. 125 ee 0.0425 0.300 X X X<br> 3.00*4.00 aa 003. 004. 125125 eea 0.02750.0202 0.7591.38 XX XX XX<br>*5.00 oe 005. 125 0.0156 2.21 X X X<br>re a<br>* The fuses of 4A and 5A for 272 and 278 Series are obsolete.<br>© 2015 Littelfuse, Inc.<br>Specifications are subject to change without notice. Application testing is strongly recommended.Specifications are subject to change without notice.<br>Revised: 07/29/15<br>**----- End of picture text -----**<br> **Radial Lead Fuses** MICRO™ > Very Fast-Acting Fuse > 272/273/274/278/279 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 [261 x 483] intentionally omitted <==** **----- Start of picture text -----**<br> Average Time Current Curves<br>100<br>10<br>1<br>0.1<br>0.01<br>0.001<br>0.005 0.01 0.1 1 10 100<br>CURRENT IN AMPERES<br>Recommended Process Parameters:<br>Wave Parameter Lead-Free Recommendation<br>Preheat:<br>(Depends on Flux Activation Temperature) (Typical Industry Recommendation)<br> Temperature Minimum: 100° C<br> Temperature Maximum: 150° C<br> Preheat Time: 60-180 seconds<br>Solder Pot Temperature: 260° C Maximum<br>Solder Dwell Time: 2-5 seconds<br>1/200 A 1/100 A 1/64 A 1/32 A 1/16 A 1/8 A 1/4 A 1/2 A 3/4 A1 A 1 1/2 A2 A 3 A 4 A 5 A<br>TIME IN SECONDS<br>**----- End of picture text -----**<br> **==> picture [243 x 199] intentionally omitted <==** **==> picture [15 x 5] intentionally omitted <==** **----- Start of picture text -----**<br> Note:<br>**----- End of picture text -----**<br> 1. Rerating depicted in this curve is in addition to the standard derating of 25% for continuous operation. ## ~~**Soldering Parameters - Wave Soldering**~~ **==> picture [243 x 172] intentionally omitted <==** **----- Start of picture text -----**<br> 300<br>280<br>260<br>240<br>220<br>200<br>180<br>160<br>140<br>120<br>100<br>80<br>60<br>40<br>20<br>0<br>Time (Seconds)<br>Preheat Time Cooling Time<br>Dwell Time<br>Temperature (°C) - Measured on bottom side of board 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240<br>**----- End of picture text -----**<br> ## **Recommended Hand-Solder Parameters:** Solder Iron Temperature: 350° C +/- 5°C Heating Time: 5 seconds max. **Note: These devices are not recommended for IR or Convection Reflow process.** © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 07/29/15 **Radial Lead Fuses** MICRO™ > Very Fast-Acting Fuse > 272/273/274/278/279 Series **==> picture [505 x 630] intentionally omitted <==** **----- Start of picture text -----**<br> Product Characteristics Dimensions<br>ec ee<br>273 and 279: –55ºC to +85ºC; 272 000 Series<br>Operating Temperature:<br>272 and 278: –55ºC to +125ºC (Short Lead, Metal Cap)<br>Military QPL type (FM02). 5.97 7.30<br>Fuses to MIL SPEC (.235") (.29") 4.32<br>To order, change 273 to 274. A har (.17")<br>272 and 278 series cap:<br>Nickel Plated Brass 2.54 (.10")<br>273, 274 and 279 series cap:<br>Materials Mirror polished Polycarbonate<br>Base: R-4 Ryton 278 000 Series<br>(Long Lead, Metal Cap)<br>Pins: Tin Plated Copper<br>5.97 7.30<br>Product Marking Current and voltage ratings stamped (.235") (.29") 25.4 (1.0")<br>on cap Pf be,<br>2.54 (.10")<br>Part Numbering System<br>LO O K__—-<br>273 000 and 274 000 Series<br>(Short Lead, Clear Plastic Cap)<br>0273 xxxx V<br>6.35 8.89<br>(.25") (.35") 4.32<br>(.17")<br>Series<br>2.54 (.10")<br>— | Pa ab<br>Amp. Code ©) LIES<br>Refer to Amp Code column of<br>Electrical Characteristics Table<br>279 000 Series<br>Packaging Code (Long Lead, Clear Plastic Cap)<br>V = 5H = 100 Pa (.25")6.35 (.35")8.89 a 25.4 (1.0") e ,<br>2.54 (.10")<br>Additional Information<br>OO —_-;<br>NOTE: Amperage and voltage rating stamped on cap.<br>Leads are tin plated copper; .025" diameter.<br>a<br>Datasheet Resources Samples<br>272 Series 272 Series 272 Series Packaging<br>Lo<br>Quantity &<br>Packaging Packaging<br>Quantity Packaging<br>Option Specification Code<br>Datasheet Resources Samples<br>273 Series 273 Series 273 Series<br>Bulk N / A 5 V<br>Bulk N / A 100 H<br>a ———<br>Datasheet Resources Samples<br>274 Series 274 Series 274 Series<br>kd<br>Datasheet Resources Samples<br>278 Series 278 Series 278 Series<br>ag<br>Datasheet Resources Samples<br>279 Series 279 Series 279 Series<br>**----- End of picture text -----**<br> © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 07/29/15
Updated at June 5, 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.
About Novapart
Novapart is a B2B electronic component broker specialising in stock shortages and cost reduction. We source hard-to-find parts and identify compliant alternatives across a catalogue of 540,000+ components from 500+ manufacturers.
Learn more →Stock Shortage Specialist
When a component is unavailable, discontinued or has an unacceptable lead time, we tap into our network of vetted European and Asian distributors to source what you need — without compromising on quality or traceability.
Request a quote →Compliant Alternatives
We identify pin-to-pin, electrically equivalent substitutes that meet the same certifications (RoHS, AEC-Q100, REACH) as your original specification — validated against datasheets, not just part numbers. Often at a lower cost.
BOM Analysis service →