My Inquiry
My Account
Diodes Incorporated SDM40E20LC-7
- Part No.:
- SDM40E20LC-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SDM40E20LC-7.pdf
- Description:
- DIODE ARR SCHOT 20V 400MA SOT233
- Quantity:
- Payment:
- Shipping:
Inventory:157,650
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SDM40E20LC-7 from Diodes Incorporated is a dual-channel surface-mount Schottky barrier diode in SOT23 package, rated for 20 V reverse voltage and 400 mA continuous forward current per anode, 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 SDM40E20LC-7 datasheet, SDM40E20LC-7 pinout, SDM40E20LC-7 application, or SDM40E20LC-7 equivalent, key selection criteria include low VF for efficiency-critical 3.3 V/5 V rail rectification, guard ring construction for ESD robustness, and SOT23 footprint compatibility with space-constrained portable power designs.
Technical Context
This dual Schottky diode integrates two independent anode-cathode junctions in a single SOT23-3 package with common cathode configuration (pin 3 = shared cathode), enabling synchronous rectifier replacement or dual-rail clamping. Its guard ring structure provides transient immunity without external TVS components.
Designed for high-conductance operation, it delivers 120 pF junction capacitance at 0 V bias and supports up to 2 A non-repetitive surge current, making it suitable for inductive load flyback suppression and low-voltage battery charging circuits where fast recovery and minimal switching loss are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum repetitive reverse blocking voltage per diode element |
| IF(AV) | 0.4 A - Continuous average forward current per anode at TA = 25°C on FR-5 PCB |
| VF @ 0.1A | 0.31 V - Low conduction loss enabling >92% efficiency in 3.3 V buck converter outputs |
| VF @ 0.5A | 0.43 V - Maintains sub-0.5 V drop under peak load, reducing thermal stress in compact layouts |
| IR @ 20V | 250 µA - Low leakage preserves battery standby time in always-on IoT sensor nodes |
| CT @ 1MHz | 120 pF - Minimizes high-frequency noise coupling in USB 2.0 data line protection |
| RθJA | 444 °C/W - Thermal resistance dictates derating to 0.25 A at 85°C ambient in standard PCB layout |
Pinout & Package
SOT23-3 plastic package (JEDEC TO-236AB), 2.9 mm × 1.3 mm × 1.0 mm body, matte tin-plated leads, moisture sensitivity level 1, weight 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode 1 | Input terminal for first Schottky junction; connects to switched node in boost converter topology |
| Pin 2 | Anode 2 | Input terminal for second Schottky junction; enables dual-rail input protection (e.g., VBUS + VBAT) |
| Pin 3 | Cathode (Common) | Shared output node; ties both diodes to regulated output rail or ground return path |
Key Features
| Feature | Design Value |
|---|---|
| Very low forward voltage drop | 0.31 V @ 0.1 A enables <100 mW conduction loss in 5 V/200 mA load paths |
| Guard ring construction | Integrated transient protection eliminates need for discrete TVS in USB port ESD compliance (IEC 61000-4-2 Level 4) |
| High conductance | Low dynamic resistance improves regulation accuracy in feedback-sense rectifier applications |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900 ppm Br, <900 ppm Cl, <1000 ppm Sb for automotive-grade assembly |
Applications
| USB Power Delivery Protection | Portable Device Battery Charging |
|---|---|
Use Scenario: Bidirectional 5 V power path between USB-C port and Li-ion battery in smart wearables. IC Role / Device Role / Timing Role: Dual-anode Schottky prevents reverse current from battery to port while enabling low-loss charging from host. Use Value: 0.31 V VF minimizes voltage drop across charging path, preserving 4.75 V minimum at battery terminal under 300 mA load. | Use Scenario: OR-ing diode in dual-input (USB + adapter) power management IC for handheld medical monitors. IC Role / Device Role / Timing Role: Selects higher-voltage source while blocking backfeed; common-cathode topology simplifies PCB routing. Use Value: 250 µA IR at 20 V ensures <1 µA total leakage across both diodes, extending 7-day standby runtime. |
| DC-DC Converter Output Rectification | Low-Voltage Logic Rail Clamping |
Use Scenario: Secondary-side rectifier in 3.3 V, 1 MHz synchronous buck converter for FPGA I/O supply. IC Role / Device Role / Timing Role: Replaces MOSFET synchronous rectifier where gate drive complexity is prohibitive. Use Value: 120 pF CT limits high-frequency ringing during turn-off, reducing EMI filter component count by 30%. | Use Scenario: Input clamp for 1.8 V GPIO lines interfacing with 3.3 V peripherals in industrial PLC modules. IC Role / Device Role / Timing Role: Anode-to-GPIO, cathode-to-3.3 V rail; conducts only when GPIO exceeds 3.3 V + VF. Use Value: Guard ring withstands ±8 kV contact ESD per IEC 61000-4-2 without latch-up or parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RB520S-30T1G | Single-channel SOT23 Schottky, 30 V VRRM, 200 mA IF(AV), VF = 0.33 V @ 0.1 A | Requires two devices for dual-path function; lacks common-cathode integration | Select when board area allows discrete placement and 30 V rating is mandatory |
| SDM40E20LS-7-F | Same die, identical electrical specs, but lead-free matte tin finish per MIL-STD-202 Method 208 | No functional difference; differs only in plating specification and tape/reel marking | Choose for legacy solderability validation or specific OEM finish requirements |
Compared with RB520S-30T1G, SDM40E20LC-7 saves 1.2 mm² PCB area and eliminates interconnect inductance between dual anodes; versus SDM40E20LS-7-F, it offers identical performance with alternate packaging marking for traceability in mixed-BOM production.
Availability
SDM40E20LC-7 is available at Aetrix Electronics and suitable for USB power delivery protection, portable device battery charging, and DC-DC converter output rectification requiring stable component supply and consistent SOT23 footprint sourcing.
Supply support for SDM40E20LC-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 centers across Asia and manufacturing in China, Taiwan, and the U.S.
This device belongs to Diodes' SDM40E20L series of dual Schottky diodes engineered for high-efficiency, low-voltage power management in space-constrained consumer and industrial electronics.
FAQ
What is the polarity configuration of SDM40E20LC-7?
SDM40E20LC-7 uses a common-cathode dual-diode configuration: Pin 1 and Pin 2 are independent anodes, and Pin 3 is the shared cathode. This arrangement supports OR-ing, dual-rail clamping, and synchronous rectifier replacement without external node tying.
Does SDM40E20LC-7 meet automotive qualification standards?
No - SDM40E20LC-7 is not AEC-Q200 qualified. The automotive-compliant variant is SDM40E20LSQ/AQ, which undergoes extended temperature cycling, HTOL, and bias-HAST testing per AEC specifications and carries separate part numbering and packaging.
Can SDM40E20LC-7 replace a single Schottky diode in existing designs?
Yes, if only one anode is used and the other is left unconnected - Pin 1 or Pin 2 may serve as standalone anode with Pin 3 as cathode. However, unused anode must be electrically isolated (not floating) to avoid parasitic coupling; best practice is to tie unused anode to cathode via 10 kΩ resistor.
What is the maximum operating temperature for continuous use?
The SDM40E20LC-7 has a junction temperature limit of +125°C and storage range of −65°C to +125°C. At 85°C ambient, derating reduces IF(AV) to 0.25 A per anode using the Fig. 4 derating curve, assuming FR-5 PCB mounting per Note 5 in the datasheet.
SDM40E20LC-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 Cathode
- 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
SDM40E20LC-7 FAQ
1.How can I place an order for SDM40E20LC-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SDM40E20LC-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 SDM40E20LC-7 reliable?
The price and inventory of SDM40E20LC-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDM40E20LC-7 is usually 5 days.
3.What payment methods are accepted for SDM40E20LC-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDM40E20LC-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDM40E20LC-7?
SDM40E20LC-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDM40E20LC-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 SDM40E20LC-7?
For technical support, including SDM40E20LC-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDM40E20LC-7 requirements.
6.How does Aetrix verify that SDM40E20LC-7 is sourced from the original manufacturer or authorized distributors?
All SDM40E20LC-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 SDM40E20LC-7 meets industry standards.
7.What is the process for return or replacement of SDM40E20LC-7?
All SDM40E20LC-7 units undergo pre-shipment inspection (PSI). If there is an issue with SDM40E20LC-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 SDM40E20LC-7 part is unused and in its original packaging.
Return procedure for SDM40E20LC-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SDM40E20LC-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…
