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MFU0805FF04000P500
Vishay Beyschlag/Draloric/BC Components
FUSE BOARD MOUNT 4A 32VDC 0805
63169 Pcs New Original In Stock
4 A AC 32 V DC Fuse Board Mount (Cartridge Style Excluded) Surface Mount 0805 (2012 Metric)
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5.0 / 5.0
- (196 Ratings)
MFU0805FF04000P500
Product Overview
1063353
DiGi Electronics Part Number
MFU0805FF04000P500-DGManufacturer
Vishay Beyschlag/Draloric/BC Components
MFU0805FF04000P500
Description
FUSE BOARD MOUNT 4A 32VDC 0805Inventory
63169 Pcs New Original In Stock
4 A AC 32 V DC Fuse Board Mount (Cartridge Style Excluded) Surface Mount 0805 (2012 Metric)
CAD Models - PCB Symbols & Footprints
Quantity
Minimum 1
Minimum 1
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MFU0805FF04000P500 Technical Specifications
Category
Fuses
Packaging
Tape & Reel (TR)
Series
MFU
Product Status
Active
Mounting Type
Surface Mount
Fuse Type
Board Mount (Cartridge Style Excluded)
Current Rating (Amps)
4 A
Voltage Rating - DC
32 V
Response Time
Fast Blow
Package / Case
0805 (2012 Metric)
Breaking Capacity @ Rated Voltage
50A
Melting I²t
0.0403
Approval Agency
UL
Operating Temperature
-55°C ~ 125°C
Color
-
Size / Dimension
0.079" L x 0.049" W x 0.018" H (2.00mm x 1.25mm x 0.45mm)
DC Cold Resistance
0.02 Ohms
Datasheet & Documents
HTML Datasheet
MFU0805FF04000P500-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8536.10.0040
Additional Information
Standard Package
5,000
Alternative Parts
View DetailsPART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
MFU0805FF04000P100
Vishay Beyschlag/Draloric/BC Components
23953
MFU0805FF04000P100-DG
0.0042
Parametric Equivalent
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
제품에 대한 정보가 세심하게 제공되고, 질문에 대한 답변도 매우 상세했어요.
Dec 02, 2025
物流の管理が徹底されており、いつでも安心して利用できます。
Dec 02, 2025
Impressive customer support combined with swift delivery—definitely a reliable company.
Dec 02, 2025
Shipping was lightning-fast; I received my order the very next day.
Dec 02, 2025
The after-sales service at DiGi Electronics is top-notch, making me feel valued as a customer.
Dec 02, 2025
My goods were shipped promptly, and the process was seamless.
Dec 02, 2025
The electronic components I purchased from DiGi Electronics perform flawlessly in my experimental setups.
Dec 02, 2025
Logistics efficiency at DiGi Electronics is unparalleled, consistently exceeding our expectations.
Dec 02, 2025
I highly value their professional approach and excellent customer care.
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Frequently Asked Questions (FAQ)
Can the MFU0805FF04000P500 be used as a drop-in replacement for Littelfuse 0400.400.HP in space-constrained portable designs, and what are the key risk factors in doing so?
The MFU0805FF04000P500 can serve as a functional alternative to the Littelfuse 0400.400.HP in low-profile, high-density PCB layouts due to its identical 0805 footprint and matching 4A current rating. However, critical differences exist: the Vishay fuse has a lower breaking capacity (50A vs. 100A) and faster I²t response (0.0403 vs. ~0.06), increasing risk of nuisance tripping under inrush-heavy loads like motor startups or capacitive charging. Verify worst-case surge current profiles and ensure fault energy remains below the MFU0805FF04000P500's interruption limit. Also confirm UL approval suffices for your end-market, as Littelfuse HP series may offer broader agency listings.
What are the PCB layout best practices for the MFU0805FF04000P500 to prevent thermal runaway and ensure reliable fast-acting performance in high-temperature environments?
To maintain the MFU0805FF04000P500's fast blow characteristics at elevated temperatures up to 125°C, minimize copper pour around the pad to avoid heat sinking that delays fusing. Use thermally balanced vias if grounding is needed, but avoid large thermal planes directly connected to both terminals. Maintain ≥0.3mm clearance to adjacent components and traces to prevent arc tracking during interruption. Place the fuse close to the power entry point and ensure at least 2 x I²t margin between the fuse and downstream components to avoid latent damage during sub-interruption events.
How does the low DC cold resistance of 0.02Ω in the MFU0805FF04000P500 impact efficiency and voltage drop in battery-powered IoT devices, and when should a fuse be bypassed?
The MFU0805FF04000P500's 0.02Ω resistance results in only 80mV drop at full 4A load and 320mW power loss, making it suitable for battery-powered systems where efficiency is critical. However, for sub-1A standby circuits, this fixed loss may dominate idle consumption. In such cases, consider a switched power architecture where the MFU0805FF04000P500 protects the main rail, but always-on peripherals use alternative protection like polyfuses or current-limiting ICs to reduce quiescent loss.
What are the reliability concerns when using the MFU0805FF04000P500 in automotive environments with frequent voltage transients and thermal cycling?
While the MFU0805FF04000P500 is rated for -55°C to 125°C and has MSL 1, its 32VDC rating provides minimal headroom against ISO 7637-2 load dump transients (which can exceed 40V). Using the MFU0805FF04000P500 in 24V automotive systems risks premature degradation or false blowing. Always pair it with transient voltage suppression (TVS) diodes or use a higher-voltage fuse variant. Additionally, validate solder joint integrity under thermal cycling via accelerated life testing, especially in underhood applications where mechanical stress accelerates fatigue failure.
How does the breaking capacity of 50A at rated voltage affect system safety when the MFU0805FF04000P500 protects a 32VDC power supply with a 1000μF bulk capacitor?
The MFU0805FF04000P500's 50A breaking capacity limits its ability to safely interrupt high-energy faults. A 32VDC supply with 1000μF capacitance can deliver over 500A peak short-circuit current initially, exceeding the fuse's interrupt rating and risking catastrophic failure (expulsion, fire). Calculate fault current using I = V/R_scp where R_scp is source impedance. If potential fault current exceeds 50A, add series current-limiting components or use a higher-breaking-capacity fuse. Always validate with short-circuit testing under worst-case operating conditions to ensure safe clearing.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
MFU0805FF04000P500 CAD Models
Vishay Beyschlag/Draloric/BC Components MFU0805FF04000P500 PCB symbols & footprints
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