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KMB14F
MDD
BRIDGE RECT 1PHASE 40V 1A KMB
85121 Pcs New Original In Stock
Bridge Rectifier Single Phase Standard 40 V Surface Mount MBF
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5.0 / 5.0
- (207 Ratings)
KMB14F
Product Overview
12363453
DiGi Electronics Part Number
KMB14F-DGManufacturer
MDD
KMB14F
Description
BRIDGE RECT 1PHASE 40V 1A KMBInventory
85121 Pcs New Original In Stock
Bridge Rectifier Single Phase Standard 40 V Surface Mount MBF
Quantity
Minimum 1
Minimum 1
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KMB14F Technical Specifications
Category
Diodes, Bridge Rectifiers
Packaging
Tape & Reel (TR)
Series
MBF
Product Status
Active
Diode Type
Single Phase
Technology
Standard
Voltage - Peak Reverse (Max)
40 V
Current - Average Rectified (Io)
1 A
Voltage - Forward (Vf) (Max) @ If
550 mV @ 1 A
Current - Reverse Leakage @ Vr
300 mA @ 40 V
Operating Temperature
-55°C ~ 1250°C (TJ)
Mounting Type
Surface Mount
Package / Case
4-SMD, Flat Leads
Supplier Device Package
MBF
Datasheet & Documents
Datasheets
Download KMB14F Product Specification (PDF)
HTML Datasheet
KMB14F-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8541.10.0080
Additional Information
Other Names
3372-KMB14FTR
MBFKMB14FS1004
Standard Package
10,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
고객 서비스를 통해 느낀 신뢰감이 큽니다.
Dec 02, 2025
Der Kundenservice ist erstklassig! Bei Fragen bekam ich sofort kompetente Unterstützung.
Dec 02, 2025
Ich schätze die zuverlässige Logistik und die pünktliche Lieferung meiner Bestellungen von DiGi Electronics sehr.
Dec 02, 2025
I found the language options helpful and easy to switch between.
Dec 02, 2025
DiGi Electronics consistently maintains high standards in their products.
Dec 02, 2025
I always appreciate their consistent on-time delivery; it shows their commitment to customer satisfaction.
Dec 02, 2025
Fast and secure shipping made my shopping experience truly satisfying.
Dec 02, 2025
Choosing DiGi Electronics means endorsing eco-friendly and cost-effective solutions.
Dec 02, 2025
Their support team provided clear and helpful guidance.
Dec 02, 2025
Their after-sales team was readily available and resolved my issues promptly.
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Frequently Asked Questions (FAQ)
When designing a compact 5V, 1A power supply, what are the potential risks of using the MDD KMB14F bridge rectifier if my input voltage could momentarily spike to 45V?
While the MDD KMB14F has a 40V PIV rating, momentary spikes to 45V represent a significant risk. Operating at or near the maximum reverse voltage (Vr) can lead to increased leakage current, premature breakdown, and potential catastrophic failure, especially under thermal stress. To mitigate this risk, consider adding a small series resistor or a transient voltage suppressor (TVS) diode before the KMB14F to clamp potential overvoltage events, or select a bridge rectifier with a higher PIV rating like the KMB24F (60V PIV) for improved robustness. Ensure your design margin accounts for these transient conditions.
What are the practical implications of the MDD KMB14F's 300mA reverse leakage current at 40V when powering sensitive analog circuits that require minimal quiescent current?
The 300mA reverse leakage specified for the MDD KMB14F at its maximum reverse voltage (40V) is a critical consideration for low-power or sensitive analog applications. This leakage current, although a maximum spec, can contribute significantly to quiescent power consumption or introduce undesirable bias currents into sensitive analog stages. If your application demands very low quiescent current (e.g., battery-powered devices), the KMB14F might not be ideal. For such scenarios, investigate ultra-low leakage Schottky bridge rectifiers or consider a design that avoids reverse bias on the rectifier when the main supply is off, or opt for a different rectifier with a specified leakage in the microampere range. If the KMB14F must be used, ensure your downstream circuitry has sufficient filtering and bias stability to tolerate this level of leakage.
How does the MDD KMB14F's 550mV @ 1A forward voltage drop compare to alternative 1A bridge rectifiers like the Vishay W04G, and what are the thermal management implications?
The MDD KMB14F's 550mV forward voltage drop at 1A is a key performance parameter. Compared to some Schottky bridge rectifiers, this standard silicon rectifier will have a higher power dissipation (P = Vf * Io = 0.55W * 1A = 0.55W per diode, totaling ~1.1W for the bridge). For instance, a Schottky equivalent might have a Vf closer to 300-400mV, reducing power loss. This higher dissipation in the KMB14F necessitates careful thermal management. If your system is space-constrained or has limited heatsinking, the KMB14F's 125°C junction temperature limit could be easily reached, leading to reduced lifespan or performance. Ensure adequate PCB copper area or a small heatsink is used to dissipate the heat generated by the KMB14F, especially when operating at its full 1A current rating.
In a situation where I need to replace a failed generic MBF-package bridge rectifier in a legacy system, is the MDD KMB14F a direct drop-in replacement for a 40V, 1A part, and what potential reliability concerns should I be aware of?
While the MDD KMB14F is described as 'MBF' package and rated for 40V/1A, directly assuming it's a perfect drop-in replacement for any generic part carries risks. Ensure the pinout (especially for 4-pin MBF packages) and the actual footprint dimensions match precisely. More importantly, understand why the original rectifier failed. If it was due to overvoltage, overcurrent, or excessive heat, the KMB14F, despite being 'Active' and ROHS compliant, might not offer superior reliability in that specific failure mode without design changes. Investigate the original failure mechanism. If the original part was a high-reliability or industrial-grade component, the KMB14F might have different internal construction or screening, potentially impacting long-term performance in harsh environments. Always verify the mechanical and electrical compatibility thoroughly.
Considering the MDD KMB14F has a high operating temperature range (-55°C to 125°C), what are the design considerations for ensuring its reliability when used in an automotive application with significant temperature fluctuations?
The MDD KMB14F's wide operating temperature range of -55°C to 125°C is beneficial for demanding environments like automotive. However, the key to reliability is managing the junction temperature (TJ) within this range, not just the ambient. Automotive applications often experience rapid temperature swings and can have high ambient temperatures due to engine bay proximity or solar loading. The KMB14F's forward voltage drop will increase at lower temperatures and leakage will increase at higher temperatures, both affecting power dissipation. Ensure your thermal design calculates the maximum expected junction temperature under worst-case hot ambient conditions and full load. Consider thermal cycling stress on the solder joints and the device itself. For extreme reliability, using the KMB14F well below its 125°C TJ limit, perhaps with a derated current and good thermal management, is crucial for longevity.
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.
KMB14F CAD Models
MDD KMB14F PCB symbols & footprints
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