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EP05Q04
KYOCERA AVX
DIODE SCHOTTKY 40V 500MA SOD123
4127 Pcs New Original In Stock
Diode 40 V 500mA Surface Mount SOD-123
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5.0 / 5.0
- (480 Ratings)
EP05Q04
Product Overview
12937629
DiGi Electronics Part Number
EP05Q04-DGManufacturer
KYOCERA AVX
EP05Q04
Description
DIODE SCHOTTKY 40V 500MA SOD123Inventory
4127 Pcs New Original In Stock
Diode 40 V 500mA Surface Mount SOD-123
Quantity
Minimum 1
Minimum 1
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EP05Q04 Technical Specifications
Category
Diodes, Rectifiers, Single Diodes
Packaging
-
Series
-
Product Status
Obsolete
Technology
Schottky
Voltage - DC Reverse (Vr) (Max)
40 V
Current - Average Rectified (Io)
500mA
Voltage - Forward (Vf) (Max) @ If
510 mV @ 500 mA
Speed
Fast Recovery =< 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr
100 µA @ 40 V
Capacitance @ Vr, F
-
Mounting Type
Surface Mount
Package / Case
SOD-123
Supplier Device Package
SOD-123
Operating Temperature - Junction
-40°C ~ 150°C
Datasheet & Documents
Datasheets
Download EP05Q04 Product Specification (PDF)
HTML Datasheet
EP05Q04-DG
Environmental & Export Classification
Moisture Sensitivity Level (MSL)
1 (Unlimited)
ECCN
EAR99
HTSUS
8541.10.0070
Additional Information
Other Names
1253-EP05Q04TR-DG
478-EP05Q04
1253-EP05Q04TR
Standard Package
3,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
만족스러운 애프터지원과 빠른 배송 추적 시스템이 돋보입니다.
Dec 02, 2025
Les prix pratiqués par DiGi Electronics sont très accessibles, tout en conservant une excellente qualité.
Dec 02, 2025
I value their upfront pricing approach that eliminates surprises at checkout.
Dec 02, 2025
Great customer service that responded quickly to my after-sales questions.
Dec 02, 2025
The website's straightforward interface makes online shopping stress-free and enjoyable.
Dec 02, 2025
Their logistics tracking system is one of the best I’ve used.
Dec 02, 2025
The reliability of DiGi Electronics' products has significantly improved our operational efficiency.
Dec 02, 2025
Their products' enduring quality is matched by their outstanding customer service.
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Frequently Asked Questions (FAQ)
Can the EP05Q04 Schottky diode be used as a drop-in replacement for the BAT54S in a 3.3V power rail reverse polarity protection circuit, and what are the key risks to consider?
The EP05Q04 is not a direct drop-in replacement for the BAT54S due to critical differences in configuration and performance. The BAT54S is a dual-diode common-cathode SOT-23 device typically used in back-to-back or series configurations for polarity protection, while the EP05Q04 is a single diode in a SOD-123 package with a higher forward voltage (510 mV @ 500 mA vs. ~310 mV for BAT54S at lower current). This higher Vf increases power loss and thermal stress in low-voltage systems like 3.3V rails. Additionally, the EP05Q04’s 100 µA reverse leakage at 40 V may cause unwanted quiescent current in battery-powered designs. If space allows, it can work in a single-diode series configuration, but thermal management and efficiency losses must be evaluated—especially near its 500 mA limit.
What are the reliability implications of using the EP05Q04 in a high-temperature automotive under-hood environment where junction temperatures may exceed 125°C?
Although the EP05Q04 is rated for a maximum junction temperature of 150°C, sustained operation above 125°C significantly accelerates degradation mechanisms such as increased reverse leakage and potential Schottky barrier height reduction. In automotive under-hood applications, thermal cycling and ambient temperatures can push the junction beyond safe margins, especially if PCB copper area for heat dissipation is inadequate. Given that the EP05Q04 is now obsolete, long-term supply and qualification for AEC-Q101 compliance are concerns—KYOCERA AVX does not list this part as automotive-grade. For new designs, consider qualified alternatives like the RB521S30T1G (ROHM) or NSR050N10LS2T1G (ON Semiconductor), which offer similar performance with full automotive certification and active lifecycle support.
How does the reverse leakage current of the EP05Q04 at 40 V compare to modern ultra-low-leakage Schottky diodes like the PMEG4010CEH, and what impact could this have in a solar-powered IoT sensor node?
The EP05Q04 exhibits 100 µA of reverse leakage current at 40 V, which is orders of magnitude higher than modern alternatives like the PMEG4010CEH (Nexperia), which leaks only ~2 µA under similar conditions. In a solar-powered IoT sensor node with intermittent energy harvesting, this leakage can represent a significant parasitic load—potentially draining the energy storage capacitor during dark periods and reducing overall system uptime. Even at partial reverse bias (e.g., 12–24 V), the EP05Q04’s leakage remains relatively high due to its older Schottky construction. For ultra-low-power designs, replacing the EP05Q04 with a diode featuring guard-ring structures or PtSi Schottky barriers is strongly recommended to minimize standby losses.
Is it safe to parallel two EP05Q04 diodes to achieve 1 A output in a DC-DC converter output rectification stage, and what design precautions are necessary?
Paralleling two EP05Q04 diodes to reach 1 A is not recommended without careful design due to inherent current sharing imbalances caused by slight variations in forward voltage (Vf) between units. Schottky diodes have a negative temperature coefficient for Vf, meaning the diode carrying slightly more current heats up and conducts even more—leading to thermal runaway. Even with matched batches, the SOD-123 package has limited thermal mass and poor heat spreading. If paralleling is unavoidable, use individual current-balancing resistors (e.g., 0.5 Ω, 1 W) in series with each diode and ensure symmetrical PCB layout with shared thermal vias. However, a better solution is to select a single higher-current diode like the SS14 (1 A, 40 V, SMA package), which avoids these risks entirely.
Given that the EP05Q04 is obsolete, what are the most reliable second-source or upgraded replacement options for a medical device design requiring long-term availability and traceability?
Since the EP05Q04 is obsolete and no longer recommended for new designs, especially in regulated industries like medical devices, second-source options must meet stringent lifecycle, documentation, and reliability requirements. Recommended drop-in or functional replacements include the RB521S30 (ROHM, SOD-123, 30 V, 1 A, low leakage) for higher current margin, or the SD103AWS (Vishay, SOD-323, 40 V, 200 mA) if board space allows migration. For exact footprint compatibility, the BAS40-04W (Nexperia, SOD-123, 40 V, 200 mA) offers similar specs with full production support. All these alternatives provide full datasheets, change notifications, and long-term supply agreements. Always validate EMI, thermal, and switching performance in your specific circuit before finalizing the substitution, and update BOMs with manufacturer-approved alternates to ensure regulatory compliance.
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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.
EP05Q04 CAD Models
KYOCERA AVX EP05Q04 PCB symbols & footprints
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