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MMU01020C4990FB300
Vishay Beyschlag/Draloric/BC Components
MMU 0102-50 1% BL 499R
69252 Pcs New Original In Stock
499 Ohms ±1% 0.3W Chip Resistor MELF, 0102 Anti-Sulfur, Automotive AEC-Q200, Pulse Withstanding Thin Film
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Minimum 1
5.0 / 5.0
- (479 Ratings)
MMU01020C4990FB300
Product Overview
10466982
DiGi Electronics Part Number
MMU01020C4990FB300-DGManufacturer
Vishay Beyschlag/Draloric/BC Components
MMU01020C4990FB300
Description
MMU 0102-50 1% BL 499RInventory
69252 Pcs New Original In Stock
499 Ohms ±1% 0.3W Chip Resistor MELF, 0102 Anti-Sulfur, Automotive AEC-Q200, Pulse Withstanding Thin Film
Quantity
Minimum 1
Minimum 1
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MMU01020C4990FB300 Technical Specifications
Category
Chip Resistor - Surface Mount
Packaging
Tape & Reel (TR)
Series
MMU - Professional
Product Status
Active
Resistance
499 Ohms
Tolerance
±1%
Power (Watts)
0.3W
Composition
Thin Film
Features
Anti-Sulfur, Automotive AEC-Q200, Pulse Withstanding
Temperature Coefficient
±50ppm/°C
Operating Temperature
-55°C ~ 155°C
Package / Case
MELF, 0102
Supplier Device Package
0102
Ratings
AEC-Q200
Size / Dimension
0.055" Dia x 0.142" L (1.40mm x 3.60mm)
Height - Seated (Max)
-
Number of Terminations
2
Failure Rate
-
Datasheet & Documents
HTML Datasheet
MMU01020C4990FB300-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8533.21.0040
Additional Information
Other Names
749-MMU01020C4990FB300CT
749-MMU01020C4990FB300TR
749-MMU01020C4990FB300DKR
Standard Package
3,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
грудня 02, 2025
품질 좋은 제품을 경쟁력 있는 가격에 제공하며, 재고도 항상 충분해서 작업에 차질이 없습니다.
грудня 02, 2025
每一次的客服互動都非常專業且令人放心，是我長期合作的最佳選擇。
грудня 02, 2025
Leur ponctualité rend notre gestion de stock beaucoup plus simple et efficace.
грудня 02, 2025
Support staff showed genuine interest in resolving my issues, exceeding expectations.
грудня 02, 2025
Post-purchase, I received detailed instructions that were easy to follow.
грудня 02, 2025
Shopping here is budget-friendly and budget-conscious.
грудня 02, 2025
Logistics at DiGi Electronics is seamless, which greatly enhances our supply chain reliability.
грудня 02, 2025
DiGi Electronics’ commitment to quality gives me peace of mind when shopping.
грудня 02, 2025
Website responsiveness on both desktop and mobile devices is excellent.
грудня 02, 2025
They handled my order with great speed and care, thank you.
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Frequently Asked Questions (FAQ)
How does the MMU01020C4990FB300 compare to the ERJ-P02J499V in high-pulse applications for automotive circuits?
The MMU01020C4990FB300 offers superior pulse-withstanding capability compared to the Panasonic ERJ-P02J499V due to its robust thin-film MELF construction and AEC-Q200 qualification. In automotive applications such as engine control units or power steering sensors, where voltage transients are common, the MMU01020C4990FB300's pulse resilience reduces the risk of resistance drift or open-circuit failure. Additionally, its anti-sulfur construction enhances long-term reliability in under-hood environments where sulfur exposure degrades standard resistors—unlike the ERJ-P02 series, which lacks sulfur resistance. Designers should choose the MMU01020C4990FB300 over ERJ-P02J499V when operating in harsh, transient-prone automotive systems requiring sustained precision.
Can the MMU01020C4990FB300 be used as a direct replacement for the SMM102-499-1-5 in safety-critical sensing circuits?
Replacing the Bourns SMM102-499-1-5 with the MMU01020C4990FB300 requires careful evaluation of thermal stability and long-term drift. While both are MELF resistors with ±1% tolerance, the MMU01020C4990FB300 offers an improved ±50ppm/°C temperature coefficient and AEC-Q200 qualification, making it better suited for safety-critical systems like brake sensors or battery monitoring. However, note the MMU01020C4990FB300's slightly lower 0.3W power rating vs. SMM102's 0.5W—verify thermal derating in high-ambient environments. For DC sensing bridges where stability outweighs peak power, the MMU01020C4990FB300 is a superior, more reliable upgrade.
What PCB layout considerations should be addressed when integrating the MMU01020C4990FB300 in high-reliability automotive designs?
When placing the MMU01020C4990FB300 on PCBs for automotive applications, use symmetric copper pads to balance thermal stress and prevent tombstoning during reflow. Due to its cylindrical MELF package (0102), solder fillet inspection is harder than with chip resistors—implement automated optical inspection (AOI) with curved-surface optimization. Ensure at least 0.5mm clearance to adjacent components to accommodate thermal expansion in the -55°C to 155°C operating range. Also, avoid placing the MMU01020C4990FB300 near high-vibration sources without conformal coating, as mechanical stress can compromise solder joints despite its pulse-withstanding durability.
How does sulfur resistance in the MMU01020C4990FB300 improve reliability in off-road vehicle electronics?
The MMU01020C4990FB300 incorporates anti-sulfur barrier layers that prevent sulfur penetration into the nickel barrier layer of the terminations—a common failure mode in standard resistors used in high-sulfur environments like off-road or agricultural machinery exhaust zones. Sulfur-induced resistance increase or open circuits are mitigated by the MMU01020C4990FB300's construction, ensuring stable operation over extended field use. Designers should select the MMU01020C4990FB300 over non-sulfur-resistant alternatives (e.g., standard thick-film MELF) in under-chassis or engine-bay electronics to avoid field failures and warranty claims.
What derating guidelines should be followed for the MMU01020C4990FB300 in continuous high-temperature environments above 100°C?
For reliable operation above 100°C, apply power derating to the MMU01020C4990FB300 per its 0.3W rating: at 125°C, use no more than 50% of rated power (0.15W), and at 155°C, limit to 30% (0.09W) to avoid accelerated aging or thermal runaway. High temperature increases resistance drift risk, especially in precision feedback or voltage divider circuits. Additionally, verify PCB thermal conductivity—use thermal vias under ground-connected traces if nearby power components raise board temperature. In automotive power management modules, pairing the MMU01020C4990FB300 with thermal relief designs ensures long-term stability and compliance with AEC-Q200 lifecycle requirements.
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.
MMU01020C4990FB300 CAD Models
Vishay Beyschlag/Draloric/BC Components MMU01020C4990FB300 PCB symbols & footprints
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