My Inquiry
My Account
Diodes Incorporated SDM20N40A-7
- Part No.:
- SDM20N40A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SDM20N40A-7.pdf
- Description:
- DIODE ARR SCHOT 40V 200MA SOT233
- Quantity:
- Payment:
- Shipping:
Inventory:2,952
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SDM20N40A from Diodes Incorporated is a dual common-anode surface-mount Schottky barrier diode rated for 40 V peak reverse voltage and 200 mA continuous forward current per element, with typical forward voltage of 300 mV at 10 mA and 420 mV at 100 mA, used in low-loss DC-DC converter output rectification and USB power path protection.
For engineers reviewing the SDM20N40A datasheet, SDM20N40A pinout, SDM20N40A application, or SDM20N40A equivalent, key selection criteria include its low VF at light-to-moderate load currents, SOT23 dual-diode topology with shared anode, thermal resistance of 500 °C/W on FR4, and AEC-Q101 readiness for automotive power management designs.
Technical Context
This dual Schottky diode integrates two independent junctions sharing a common anode terminal in a single SOT23 package, enabling compact synchronous rectifier or OR-ing configurations without external wiring. Its low forward voltage minimizes conduction loss in 3.3 V/5 V rail clamping and battery backup switching circuits.
The device exhibits 23 pF typical junction capacitance at 0 V bias and 15 µA max reverse leakage at 30 V and 25 °C, supporting high-frequency operation up to several MHz while maintaining low dynamic losses in buck converter freewheel paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage per diode element |
| IFM (per element) | 200 mA - Continuous forward current rating per diode under TA = +25°C |
| VF @ 100 mA | 420 mV - Forward voltage drop determining conduction loss in 100 mA load paths |
| IR @ 30 V | 15 µA - Reverse leakage current at room temperature, critical for standby power budgeting |
| RθJA | 500 °C/W - Thermal resistance from junction to ambient on standard FR4 PCB, defining derating curve |
| CT @ 0 V | 23 pF - Junction capacitance affecting high-frequency switching noise and EMI performance |
Pinout & Package
Package: SOT23 (Standard), 3-terminal plastic molded case with matte tin-plated leads, moisture sensitivity level 1 per J-STD-020, weight ≈ 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Common Anode | Shared anode connection for both Schottky junctions; ties to positive supply or switch node |
| 2 (Cathode 1) | Cathode Element 1 | Independent cathode for first diode; used for primary power path or redundancy channel |
| 3 (Cathode 2) | Cathode Element 2 | Independent cathode for second diode; enables dual-rail OR-ing or split-load rectification |
Key Features
| Feature | Design Value |
|---|---|
| Low VF at 10–100 mA | 300–420 mV - Reduces conduction loss by >40% vs. standard silicon diodes in 3.3 V/5 V systems |
| Common-anode dual configuration | SOT23-3 footprint - Enables space-constrained OR-ing and redundant power path design without discrete layout |
| Thermal performance on FR4 | 500 °C/W RθJA - Supports 200 mA operation up to +75°C ambient with standard PCB copper |
| AEC-Q101 readiness | IATF 16949 manufacturing - Qualifiable for automotive body electronics and infotainment power rails |
Applications
| USB Power Path Protection | DC-DC Converter Output Rectification |
|---|---|
Use Scenario: Preventing backfeed from downstream USB ports into host VBUS during cable disconnect or fault conditions. IC Role / Device Role / Timing Role: Dual-cathode Schottky diode providing isolated reverse-blocking paths from two USB ports to shared VBUS rail. Use Value: Eliminates need for two separate SOT23 diodes and reduces board area by 35% while maintaining <420 mV forward drop at 100 mA. | Use Scenario: Freewheeling path in non-synchronous buck converters powering FPGA I/O banks or microcontroller peripherals. IC Role / Device Role / Timing Role: Low-VF rectifier replacing higher-loss silicon diodes to improve efficiency at light loads. Use Value: Delivers 300 mV VF at 10 mA, reducing no-load power loss by 60% compared to 1N5819-class devices. |
| Battery Backup Switching | Automotive Body Control Module Power OR-ing |
Use Scenario: Seamless switchover between main 5 V rail and coin-cell backup supply in real-time clock circuits. IC Role / Device Role / Timing Role: Common-anode dual diode isolating main and backup sources while feeding same load node. Use Value: Ensures <15 µA leakage at 3.3 V ensures >10-year coin-cell lifetime; 23 pF CT avoids signal integrity issues on RTC lines. | Use Scenario: OR-ing two independent 12 V supplies (e.g., battery and alternator) to power BCM logic rails. IC Role / Device Role / Timing Role: Dual Schottky diode implementing passive redundancy with minimal voltage drop across each path. Use Value: 420 mV VF at 200 mA limits voltage loss to <0.42 V, preserving brown-out margin for 5 V LDO inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual common-anode Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RB050M-30 | Single diode, 30 V VRRM, 500 mA IFM, SOD-323 package | Not dual; requires two devices for same function; higher current but lower voltage rating | Select only if higher current per element (>200 mA) is required and board space allows dual placement |
| NSR20F40NXT5G | Dual common-cathode configuration, 40 V VRRM, 200 mA IFM, SOT-23 package | Inverted polarity - requires circuit redesign to accommodate cathode-common topology | Choose only when existing layout uses cathode-common routing or when sourcing constraints favor ON Semi inventory |
Compared with RB050M-30 and NSR20F40NXT5G, SDM20N40A uniquely delivers dual common-anode functionality in SOT23 with verified 40 V/200 mA ratings and lowest VF at sub-100 mA loads-making it optimal for space-limited, low-power OR-ing and USB protection where anode-referenced switching is preferred.
Availability
SDM20N40A is available at Aetrix Electronics and suitable for USB power management, DC-DC converter rectification, and automotive body control module designs requiring stable component supply and long-term lifecycle support.
Supply support for SDM20N40A 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-efficiency power management and signal integrity solutions for industrial, automotive, and consumer markets.
The SDM20N40A belongs to Diodes' Schottky diode product line, engineered specifically for low-voltage, high-efficiency power path control in space-constrained portable and automotive electronics.
FAQ
What is the maximum junction temperature for SDM20N40A?
The SDM20N40A has a specified junction temperature range of –65 °C to +125 °C. This limit is defined by semiconductor material properties and packaging integrity, and must be respected under all operating conditions-including transient surges and elevated ambient temperatures-to ensure reliability and prevent thermal runaway.
Is SDM20N40A qualified to AEC-Q101?
SDM20N40A is manufactured in IATF 16949-certified facilities and supports PPAP documentation; however, official AEC-Q101 qualification status requires direct confirmation from Diodes Incorporated's automotive quality team and is not stated in DS30542 Rev. 8–2. Customers targeting automotive applications should request formal qualification reports before design-in.
Can SDM20N40A replace a single 1N5819 in a circuit?
No-SDM20N40A contains two Schottky diodes in common-anode configuration and cannot substitute a single-diode part without circuit modification. Using only one cathode would leave the second junction unconnected, risking parasitic coupling; full utilization requires dual-path or OR-ing topologies.
What is the recommended pad layout for SDM20N40A in SOT23?
Diodes specifies a recommended SOT23 pad layout with X = 0.8 mm, Y = 0.9 mm, X1 = 1.35 mm, Y1 = 2.9 mm, and C = 2.0 mm (all dimensions in mm). This layout optimizes solder joint reliability and thermal dissipation, and is published on Diodes' package outlines webpage for reference and CAD import.
SDM20N40A-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Diode Configuration:
- 1 Pair Common Anode
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io) (per Diode):
- 200mA (DC)
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 200 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 15 µA @ 30 V
- Operating Temperature - Junction:
- -65°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
SDM20N40A-7 FAQ
1.How can I place an order for SDM20N40A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SDM20N40A-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 SDM20N40A-7 reliable?
The price and inventory of SDM20N40A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDM20N40A-7 is usually 5 days.
3.What payment methods are accepted for SDM20N40A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDM20N40A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDM20N40A-7?
SDM20N40A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDM20N40A-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 SDM20N40A-7?
For technical support, including SDM20N40A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDM20N40A-7 requirements.
6.How does Aetrix verify that SDM20N40A-7 is sourced from the original manufacturer or authorized distributors?
All SDM20N40A-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 SDM20N40A-7 meets industry standards.
7.What is the process for return or replacement of SDM20N40A-7?
All SDM20N40A-7 units undergo pre-shipment inspection (PSI). If there is an issue with SDM20N40A-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 SDM20N40A-7 part is unused and in its original packaging.
Return procedure for SDM20N40A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SDM20N40A-7 Tags
-
BAV99-7-F
Diodes Incorporated
-
BAT54C-7-F
Diodes Incorporated
-
BAV99,215
Nexperia USA Inc.
-
BAT54SLT1G
onsemi
-
BAV70LT1G
onsemi
-
BAT54CLT1G
onsemi
-
BAT54S-7-F
Diodes Incorporated
-
BAV99LT1G
onsemi
-
BAT54S,215
Nexperia USA Inc.
-
BAS40-04LT1G
onsemi
-
MMBD1503-TP
Micro Commercial Co
-
BAV99WT1G
onsemi
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…
