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Diodes Incorporated SDM20E40C-7-F
- Part No.:
- SDM20E40C-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SDM20E40C-7-F.pdf
- Description:
- DIODE ARR SCHOT 40V 400MA SC593
- Quantity:
- Payment:
- Shipping:
Inventory:708
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Product details
Overview
SDM20E40C-7-F from Diodes Incorporated is a dual common-cathode surface-mount Schottky barrier diode rated for 40 V peak reverse voltage, 0.4 A forward current, and 0.50 V max forward voltage at 200 mA, with 70 µA max reverse leakage at 25 V. It serves as a polarity protection or freewheeling diode in compact DC power rails and low-voltage switching converters.
For engineers reviewing the SDM20E40C-7-F datasheet, SDM20E40C-7-F pinout, SDM20E40C-7-F application, or SDM20E40C-7-F equivalent, key selection criteria include its low VF (300 mV typ. @ 10 mA), ultra-low IR, SC59 package footprint, thermal resistance (RθJA = 180 °C/W), and RoHS-compliant green construction.
Technical Context
This dual Schottky diode integrates two anodes sharing one cathode in a single SC59 package, enabling compact dual-path rectification or bidirectional clamping without external interconnects. Its silicon Schottky junction delivers fast switching (no minority-carrier storage) and operates across –30 °C to +85 °C ambient.
The device exhibits 100 pF typical junction capacitance at 0 V bias and derates linearly to 500 mW maximum power dissipation at 25 °C ambient, falling to zero at 150 °C per the published derating curve. Thermal resistance from junction to case is 41 °C/W, supporting localized heatsinking in high-density layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage before breakdown; defines safe DC rail margin in 24 V systems. |
| IFM | 0.4 A - Continuous forward current rating; sets max steady-state load current per diode leg. |
| VF Max | 500 mV @ 200 mA - Upper limit of forward drop; determines conduction loss and self-heating under load. |
| IR Max | 70 µA @ 25 V - Maximum reverse leakage; critical for battery-powered circuits where standby drain must be minimized. |
| RθJA | 180 °C/W - Junction-to-ambient thermal resistance on FR4 board; used to calculate temperature rise under power dissipation. |
| CT | 100 pF @ 0 V - Junction capacitance; impacts high-frequency switching noise and EMI filtering design. |
Pinout & Package
Package: SC59 - 3-pin SOT-23 variant with gull-wing leads, 0.008 g mass, UL 94V-0 molding compound, and matte tin-plated copper leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 (Pin 1) | First diode anode | Accepts positive input for first Schottky path; routed separately to enable independent control. |
| Cathode (Pin 2) | Common cathode node | Shared return path for both diodes; connects to system ground or negative rail. |
| Anode 2 (Pin 3) | Second diode anode | Accepts positive input for second Schottky path; enables dual-input or redundancy topology. |
Key Features
| Feature | Design Value |
|---|---|
| Common cathode configuration | Single shared cathode pin reduces PCB routing complexity and enables dual-anode protection on one net. |
| Low VF (300 mV typ. @ 10 mA) | Minimizes forward conduction loss in low-voltage (<5 V) applications such as USB power switches and sensor supply rails. |
| 70 µA IR max @ 25 V | Ensures sub-µA-level standby current draw in always-on battery circuits like IoT endpoint nodes. |
| SC59 package with 180 °C/W RθJA | Enables thermal management on standard FR4 without thermal vias in space-constrained consumer electronics. |
Applications
| USB Power Switch Protection | DC-DC Converter Freewheeling |
|---|---|
Use Scenario: Prevents reverse current flow when multiple USB ports share a common VBUS rail during hot-plug events. IC Role / Device Role / Timing Role: Polarity protection diode placed between upstream source and downstream port controller. Use Value: 0.50 V max VF limits voltage drop to <2% on 5 V rails, preserving USB compliance margins. | Use Scenario: Provides low-loss recirculation path for inductor current during MOSFET off-time in buck converters. IC Role / Device Role / Timing Role: Synchronous rectifier replacement in low-current (<400 mA) non-isolated DC-DC stages. Use Value: 100 pF junction capacitance minimizes switching node ringing and EMI generation at 1–2 MHz switching frequencies. |
| Industrial Sensor Supply Rail | Redundant Power OR-ing |
Use Scenario: Isolates 3.3 V sensor supply from back-fed current when main MCU rail drops during brown-out. IC Role / Device Role / Timing Role: Reverse current blocking diode on regulated LDO output feeding analog sensors. Use Value: 70 µA max IR ensures <230 nW reverse power loss at 3.3 V, extending battery life in wireless sensor nodes. | Use Scenario: Enables seamless switchover between primary and backup 12 V supplies in programmable logic controllers. IC Role / Device Role / Timing Role: Dual-anode OR-ing diode allowing either supply to feed common load while blocking reverse feed. Use Value: Common cathode architecture eliminates need for discrete cathode tie, reducing layout area by 35% vs. two separate SOD-123 devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MBR0540T1G | Single diode, same 40 V/0.5 A rating, but TO-236AB (SOT-23) package with higher RθJA (200 °C/W). | Lacks dual-anode functionality; requires two devices for common-cathode use cases. | Select only when dual-diode integration is unnecessary and board space allows separate placement. |
| SS24 | 40 V/2 A rating, 0.55 V VF max @ 2 A, but larger SMA package and 500 µA IR max @ 25 V. | Higher current capability but significantly higher leakage; unsuitable for ultra-low-power sleep modes. | Prefer for higher-current freewheeling where leakage is not critical, e.g., industrial motor drivers. |
Compared with MBR0540T1G and SS24, SDM20E40C-7-F uniquely combines dual-anode integration, ultra-low IR, and SC59 footprint-making it optimal for space- and leakage-sensitive dual-path protection in portable and sensor-edge designs.
Availability
SDM20E40C-7-F is available at Aetrix Electronics and suitable for USB power management, DC-DC converter freewheeling, and industrial sensor supply rails requiring stable component supply and long-term manufacturability.
Supply support for SDM20E40C-7-F 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 and manufacturing operations across Asia and the Americas.
The SDM20E40C belongs to Diodes' Schottky Barrier Diode product line, engineered specifically for low-VF, low-leakage protection and recirculation in space-constrained, energy-efficient power systems.
FAQ
What is the maximum junction temperature for SDM20E40C-7-F?
The absolute maximum junction temperature is +125 °C, as specified in the Thermal Characteristics table. Operation above this temperature risks permanent degradation of the Schottky junction and increased reverse leakage. Derating begins at +25 °C ambient, with full power (400 mW) permitted only below that point.
Does SDM20E40C-7-F support reflow soldering per J-STD-020?
Yes - the SC59 package is rated for Moisture Sensitivity Level 1 per J-STD-020, meaning it can withstand unlimited floor life and standard Pb-free reflow profiles (peak 260 °C) without baking. The matte tin finish ensures reliable wetting and joint integrity on FR4 boards.
Can SDM20E40C-7-F replace a single SOD-123 Schottky diode?
No - SDM20E40C-7-F is a dual common-cathode device with three terminals; using only one anode ignores half the die and wastes PCB area. For single-diode replacement, select a matched single-channel part like SDM04A40C-7-F, which shares identical electrical specs and SC59 packaging.
Is the 70 µA IR spec guaranteed over temperature?
No - the 70 µA maximum reverse leakage is specified only at TA = +25 °C and VR = 25 V. As shown in Figure 2, IR rises exponentially with temperature: it reaches ~1000 µA at +125 °C. System-level leakage budgets must account for worst-case TJ, not just ambient.
SDM20E40C-7-F 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):
- 40 V
- Current - Average Rectified (Io) (per Diode):
- 400mA (DC)
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 200 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 70 µA @ 25 V
- Operating Temperature - Junction:
- -30°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
SDM20E40C-7-F FAQ
1.How can I place an order for SDM20E40C-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SDM20E40C-7-F 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 SDM20E40C-7-F reliable?
The price and inventory of SDM20E40C-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDM20E40C-7-F is usually 5 days.
3.What payment methods are accepted for SDM20E40C-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDM20E40C-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDM20E40C-7-F?
SDM20E40C-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDM20E40C-7-F 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 SDM20E40C-7-F?
For technical support, including SDM20E40C-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDM20E40C-7-F requirements.
6.How does Aetrix verify that SDM20E40C-7-F is sourced from the original manufacturer or authorized distributors?
All SDM20E40C-7-F 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 SDM20E40C-7-F meets industry standards.
7.What is the process for return or replacement of SDM20E40C-7-F?
All SDM20E40C-7-F units undergo pre-shipment inspection (PSI). If there is an issue with SDM20E40C-7-F, 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 SDM20E40C-7-F part is unused and in its original packaging.
Return procedure for SDM20E40C-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SDM20E40C-7-F 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
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