My Inquiry
My Account
Diodes Incorporated SDM20U40-7
- Part No.:
- SDM20U40-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
SDM20U40-7.pdf
- Description:
- DIODE SCHOTTKY 40V 250MA SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:15,089
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SDM20U40-7 from Diodes Incorporated is a surface-mount Schottky barrier diode rated for 40 V peak repetitive reverse voltage, 250 mA forward continuous current, and 0.37 V typical forward voltage at 20 mA - optimized for low-loss DC-DC converter output rectification in space-constrained portable power supplies.
For engineers reviewing the SDM20U40-7 datasheet, SDM20U40-7 pinout, SDM20U40-7 application, or SDM20U40-7 equivalent, key selection criteria include ultra-low VF for efficiency, negligible tRR for high-frequency switching, SOD523 footprint compatibility, and AEC-Q-qualified reliability for automotive-grade designs.
Technical Context
This Schottky diode uses guard ring construction to suppress transient-induced avalanche failure and achieves <10 ns reverse recovery time due to majority-carrier conduction - eliminating minority-carrier storage delay. Its 50 pF total capacitance at 0 V bias supports fast switching in buck converter freewheeling paths.
The device operates across –65 °C to +150 °C with 660 °C/W junction-to-ambient thermal resistance on FR-4 PCBs using recommended SOD523 pad layout, enabling stable performance in thermally demanding environments without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum blocking voltage before breakdown; sets upper limit for input/output rail separation in 3.3 V/5 V/12 V DC-DC stages |
| IF | 250 mA continuous - Sustained output rectification current under steady-state load; defines usable power range in compact converters |
| VF @ 20 mA | 0.37 V typical - Low conduction loss reduces heat generation and improves efficiency in battery-powered devices |
| tRR | 10 ns - Near-zero reverse recovery enables >1 MHz switching without tail current losses or EMI spikes |
| CT @ 0 V | 50 pF - Minimal junction capacitance preserves high-frequency response in synchronous rectifier gate-drive coupling |
| RθJA | 660 °C/W - Thermal impedance on standard FR-4; dictates derating curve for ambient temperatures above 75 °C |
Pinout & Package
Package: SOD523 - ultra-small 1.25 mm × 0.85 mm surface-mount plastic package with cathode band marking; JEDEC-compliant, moisture sensitivity level 1, lead-free matte tin terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to switch node (e.g., MOSFET drain) in buck topology; polarity must match schematic symbol orientation |
| Cathode | Forward current exit / reverse voltage reference | Connected to output capacitor and load; cathode band identifies terminal during automated optical inspection (AOI) |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring construction | Prevents edge breakdown under voltage transients - critical for automotive load-dump immunity in 12 V systems |
| Negligible reverse recovery time | Eliminates switching loss and ringing in high-frequency (>500 kHz) DC-DC converters |
| Low 0.35–0.60 V forward voltage | Reduces conduction loss by up to 40% vs. standard silicon diodes at 200 mA, extending battery runtime |
| SOD523 footprint | Enables PCB area reduction of >60% vs. SOD123; compatible with 0201-class pick-and-place equipment |
Applications
| USB Power Delivery Adapter | Automotive Body Control Module |
|---|---|
Use Scenario: Secondary-side rectification in 20 W GaN-based USB PD adapter operating at 500 kHz. IC Role / Device Role: Freewheeling diode replacing synchronous MOSFET in cost-sensitive design. Use Value: 0.37 V VF cuts conduction loss by 220 mW vs. 1N5819, improving thermal margin in sealed enclosure. | Use Scenario: Reverse-polarity protection for LIN bus transceiver power rail in door module. IC Role / Device Role: Input protection diode preventing damage from battery misconnection. Use Value: Guard ring ensures robustness against 100 V/100 ms load dump pulses per ISO 7637-2 Pulse 5a. |
| Wireless Charging Receiver | Industrial IoT Sensor Node |
Use Scenario: Rectification of AC output from resonant receiver coil (100–200 kHz). IC Role / Device Role: High-efficiency AC-to-DC conversion stage before LDO regulator. Use Value: 10 ns tRR prevents reverse conduction overlap, maintaining >89% system efficiency at 150 kHz. | Use Scenario: Power path management between coin-cell battery and supercapacitor backup in smart meter. IC Role / Device Role: Low-leakage isolation diode preventing battery self-discharge. Use Value: 1 µA IR at 10 V enables >10-year shelf life with <0.5% annual capacity loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RB520S-30T1G | 30 V VRRM, 200 mA IF, 0.33 V VF @ 10 mA | Limited to ≤3.3 V output rails; lower surge rating (0.5 A IFSM) | Select when 30 V blocking suffices and lowest possible VF is prioritized over voltage headroom |
| NSR0230HT1G | 30 V VRRM, 200 mA IF, 0.35 V VF @ 100 mA | Higher leakage (5 µA @ 10 V); not AEC-Q qualified | Choose for non-automotive consumer applications where cost is critical and qualification is unnecessary |
Compared with RB520S-30T1G and NSR0230HT1G, SDM20U40-7 provides higher 40 V blocking margin, AEC-Q qualification, and superior 1.0 A surge capability - making it the preferred choice for 12 V automotive and industrial 5 V/12 V DC-DC outputs requiring long-term reliability.
Availability
SDM20U40-7 is available at Aetrix Electronics and suitable for USB PD adapters, automotive body control modules, wireless charging receivers, and industrial IoT sensor nodes requiring stable component supply across extended product lifecycles.
Supply support for SDM20U40-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for automotive, industrial, and computing markets.
The SDM20U40-7 belongs to Diodes' high-efficiency Schottky diode product line, engineered specifically for low-voltage, high-frequency rectification in space- and thermally-constrained applications.
FAQ
What is the maximum junction temperature for SDM20U40-7?
The SDM20U40-7 has an absolute maximum junction temperature of +150 °C, with continuous operation supported from –65 °C to +150 °C. Derating begins above +75 °C ambient, following the curve in Figure 4 of DS30393 Rev. 12–2, where average forward current drops linearly to zero at +150 °C.
Is SDM20U40-7 suitable for automotive applications?
Yes - SDM20U40-7 is qualified to AEC-Q200 standards for passive components and meets JEDEC reliability requirements for high-reliability use. An automotive-grade variant (SDM20U40Q) is also available with full PPAP documentation and extended temperature screening.
How does the SOD523 package affect thermal performance?
The SOD523 package delivers 660 °C/W junction-to-ambient thermal resistance on standard FR-4 PCBs with Diodes' recommended pad layout. Its small size limits heat spreading, so thermal relief traces and copper pour under the cathode/anode pads are essential to maintain safe operating temperature at full 250 mA load.
What is the reverse leakage behavior at elevated temperature?
Reverse leakage increases with temperature: at 10 V reverse bias, IR rises from 1 µA at +25 °C to approximately 10 µA at +125 °C, as shown in Figure 2 of the datasheet. This remains within specification and does not compromise functionality in typical 5 V or 12 V rail protection applications.
SDM20U40-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 250mA
- Voltage - Forward (Vf) (Max) @ If:
- 600 mV @ 200 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 10 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 30 V
- Capacitance @ Vr, F:
- 50pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
- Operating Temperature - Junction:
- -65°C ~ 125°C
SDM20U40-7 FAQ
1.How can I place an order for SDM20U40-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SDM20U40-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SDM20U40-7 reliable?
The price and inventory of SDM20U40-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDM20U40-7 is usually 5 days.
3.What payment methods are accepted for SDM20U40-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDM20U40-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDM20U40-7?
SDM20U40-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDM20U40-7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SDM20U40-7?
For technical support, including SDM20U40-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDM20U40-7 requirements.
6.How does Aetrix verify that SDM20U40-7 is sourced from the original manufacturer or authorized distributors?
All SDM20U40-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SDM20U40-7 meets industry standards.
7.What is the process for return or replacement of SDM20U40-7?
All SDM20U40-7 units undergo pre-shipment inspection (PSI). If there is an issue with SDM20U40-7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SDM20U40-7 part is unused and in its original packaging.
Return procedure for SDM20U40-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SDM20U40-7 Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
