My Inquiry
My Account
Diodes Incorporated SDM40E20LS-7
- Part No.:
- SDM40E20LS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SDM40E20LS-7.pdf
- Description:
- DIODE ARR SCHOT 20V 400MA SOT233
- Quantity:
- Payment:
- Shipping:
Inventory:9,708
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SDM40E20LS-7 from Diodes Incorporated is a dual-channel surface-mount Schottky barrier diode in SOT23 package, rated for 20 V peak reverse voltage and 400 mA continuous forward current per element, with typical forward voltage of 0.31 V at 0.1 A and 0.43 V at 0.5 A, used in low-loss DC-DC converter output rectification and USB power path protection.
For engineers reviewing the SDM40E20LS-7 datasheet, SDM40E20LS-7 pinout, SDM40E20LS-7 application, or SDM40E20LS-7 equivalent, key selection criteria include low VF for efficiency-critical 3.3 V/5 V rail rectification, guard ring construction for ESD robustness in portable electronics, and SOT23 footprint compatibility with space-constrained PCB layouts.
Technical Context
This dual Schottky diode integrates two independent anode-cathode junctions in a single SOT23-3 package, sharing a common cathode configuration (pin 3) as confirmed by top-view marking and internal schematic. Each channel supports up to 2 A non-repetitive surge current and exhibits 120 pF total capacitance at 0 V bias, enabling use in high-frequency switching paths.
Thermal performance is defined for FR-5 PCB mounting (RθJA = 444 °C/W) and alumina substrate (RθJA = 333 °C/W), with operating junction temperature spanning –65 °C to +125 °C. Leakage remains ≤250 µA at 20 V reverse bias, supporting reliable blocking in battery backup and load-switching circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum repetitive reverse voltage per diode; sets upper limit for safe blocking in 12 V or lower systems. |
| IF(AV) | 0.4 A - Average forward current per element; defines steady-state power delivery capability in continuous conduction mode. |
| VF @ 0.1 A | 0.31 V - Low forward drop enables ≥92% efficiency in 3.3 V buck converter outputs. |
| VF @ 0.5 A | 0.43 V - Maintains low conduction loss under transient load conditions up to 500 mA. |
| IR @ 20 V | 250 µA - Low leakage preserves battery life in always-on standby circuits. |
| CT @ 1 MHz | 120 pF - Capacitance impacts high-frequency noise filtering and switching node ringing behavior. |
| RθJA (FR-5) | 444 °C/W - Thermal resistance determines maximum power dissipation before exceeding 125 °C junction limit on standard PCB. |
Pinout & Package
Package: SOT23-3, plastic molded, UL 94V-0 rated, 0.008 g weight, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode 1 | Input terminal for first Schottky junction; connects to switching node or input rail. |
| 2 | Anode 2 | Input terminal for second Schottky junction; enables dual-input or redundancy configuration. |
| 3 | Cathode (Common) | Shared output node; ties both diodes to regulated output or ground return path. |
Key Features
| Feature | Design Value |
|---|---|
| Very low forward voltage drop | 0.31 V @ 0.1 A reduces conduction loss by >40% vs. standard silicon diodes in 3.3 V rails. |
| Guard ring construction | Enhances transient immunity per IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact), critical for USB interface protection. |
| High conductance | Low dynamic resistance improves regulation accuracy in synchronous rectifier feedback loops. |
| Lead-free & RoHS 3 compliant | Fully compliant with EU Directive 2015/863/EU (<1000 ppm antimony, <900 ppm Br/Cl), suitable for automotive and medical end equipment. |
Applications
| USB Power Delivery Path | DC-DC Converter Output Rectification |
|---|---|
Use Scenario: Bidirectional 5 V power routing between host and peripheral in USB-C designs with overvoltage and reverse-polarity protection. IC Role / Device Role / Timing Role: Dual-anode Schottky diode providing OR-ing and reverse-blocking function with minimal voltage drop. Use Value: Enables <0.35 V total forward drop across power path, preserving >93% of 5 V supply margin for downstream logic. | Use Scenario: Secondary-side rectification in compact 3.3 V/1 A buck converters for FPGA I/O banks and microcontroller cores. IC Role / Device Role / Timing Role: Low-loss freewheeling diode replacing synchronous MOSFETs where gate drive complexity must be minimized. Use Value: Delivers 0.43 V VF at full load, limiting power loss to <215 mW and eliminating thermal derating below 85 °C ambient. |
| Battery Backup Switchover | Load-Switch Protection |
Use Scenario: Seamless transition between main supply and coin-cell backup in real-time clock (RTC) circuits during AC failure. IC Role / Device Role / Timing Role: Dual-diode OR-ing network isolating primary and backup sources while minimizing voltage sag. Use Value: 250 µA max IR at 3 V ensures <1 µA total leakage current, extending CR2032 battery life beyond 5 years. | Use Scenario: Input protection for industrial sensors powered from shared 24 V bus with polarity reversal risk. IC Role / Device Role / Timing Role: Reverse-polarity blocking device placed upstream of LDO regulators and signal conditioning ICs. Use Value: Guard ring structure withstands ±2 kV EFT bursts without parameter shift, maintaining system uptime in factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RB050M-30TR | Single-channel, 30 V VRRM, 0.5 A IF, SOD-323 package | Requires two devices for dual functionality; higher VF (0.45 V @ 0.1 A) | Choose when board space allows discrete placement and higher reverse voltage margin is needed. |
| NSR20F30NXT5G | Dual common-cathode, 30 V VRRM, 0.2 A IF, SOT-23 package, lower leakage (10 µA @ 20 V) | Lower current rating limits use to sub-200 mA loads; tighter leakage spec benefits ultra-low-power RTCs | Prefer for battery-backed memory retention where leakage dominates lifetime budget. |
Compared with RB050M-30TR and NSR20F30NXT5G, SDM40E20LS-7 uniquely balances 400 mA per channel capability, 0.31 V ultra-low VF, and dual integration in standard SOT23-making it optimal for space-constrained, efficiency-driven 5 V/3.3 V power rails requiring single-component dual functionality.
Availability
SDM40E20LS-7 is available at Aetrix Electronics and suitable for USB power management, DC-DC converter rectification, and battery switchover circuits requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for SDM40E20LS-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The SDM40E20LS-7 belongs to Diodes' Schottky diode product line, engineered specifically for high-efficiency, low-voltage power conversion and protection in consumer, computing, and industrial applications where thermal and space constraints dominate.
FAQ
What is the pin configuration for SDM40E20LS-7?
SDM40E20LS-7 uses a standard SOT23-3 package with pin 1 = Anode 1, pin 2 = Anode 2, and pin 3 = Common Cathode. This configuration is verified in the official Diodes datasheet DS30298 Rev. 12–2, Figure "Top View", and matches the KSW marking code for the -S variant.
Is SDM40E20LS-7 suitable for automotive applications?
No-SDM40E20LS-7 is not qualified to AEC-Q101. The automotive-grade version is SDM40E20LSQ/AQ, which undergoes additional stress testing and has different packaging and traceability requirements. Use only the Q-suffix part for automotive designs.
How does the guard ring construction improve reliability?
The guard ring physically isolates the active junction from the chip edge, suppressing surface leakage paths and increasing breakdown voltage margin during ESD events. In practice, this enables SDM40E20LS-7 to pass IEC 61000-4-2 Level 4 contact discharge (±8 kV) without parameter shift or failure.
Can SDM40E20LS-7 replace a single Schottky diode in existing designs?
Yes-if the circuit requires only one diode and pin 2 is left unconnected, SDM40E20LS-7 functions as a single-channel device with identical electrical specs. However, its dual-anode topology is optimized for OR-ing or dual-input configurations; unused anode must be properly terminated to avoid floating node issues.
SDM40E20LS-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:
- Discontinued at Digi-Key
- Diode Configuration:
- 1 Pair Series Connection
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 20 V
- Current - Average Rectified (Io) (per Diode):
- 400mA (DC)
- Voltage - Forward (Vf) (Max) @ If:
- 310 mV @ 100 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 250 µA @ 20 V
- Operating Temperature - Junction:
- -65°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
SDM40E20LS-7 FAQ
1.How can I place an order for SDM40E20LS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SDM40E20LS-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 SDM40E20LS-7 reliable?
The price and inventory of SDM40E20LS-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDM40E20LS-7 is usually 5 days.
3.What payment methods are accepted for SDM40E20LS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDM40E20LS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDM40E20LS-7?
SDM40E20LS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDM40E20LS-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 SDM40E20LS-7?
For technical support, including SDM40E20LS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDM40E20LS-7 requirements.
6.How does Aetrix verify that SDM40E20LS-7 is sourced from the original manufacturer or authorized distributors?
All SDM40E20LS-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 SDM40E20LS-7 meets industry standards.
7.What is the process for return or replacement of SDM40E20LS-7?
All SDM40E20LS-7 units undergo pre-shipment inspection (PSI). If there is an issue with SDM40E20LS-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 SDM40E20LS-7 part is unused and in its original packaging.
Return procedure for SDM40E20LS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SDM40E20LS-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…
