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Diodes Incorporated SDM40E20LSQ-7-F
- Part No.:
- SDM40E20LSQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SDM40E20LSQ-7-F.pdf
- Description:
- DIODE ARR SCHOT 20V 400MA SOT233
- Quantity:
- Payment:
- Shipping:
Inventory:648
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Product details
Overview
SDM40E20LSQ-7-F from Diodes Incorporated is a dual-channel surface-mount Schottky barrier diode in SOT23 package, rated for 20 V reverse voltage and 0.4 A continuous forward current per element, with max 0.43 V forward voltage at 0.5 A and 250 µA reverse leakage at 20 V - deployed in DC-DC converter output rectification and reverse polarity protection circuits.
For engineers reviewing the SDM40E20LSQ-7-F datasheet, SDM40E20LSQ-7-F pinout, SDM40E20LSQ-7-F application, or SDM40E20LSQ-7-F equivalent, key selection criteria include low VF for efficiency-critical 3.3 V/5 V rail rectification, AEC-Q101 qualification for automotive-grade reliability, SOT23 footprint compatibility, and dual-diode integration for space-constrained blocking or OR-ing functions.
Technical Context
This dual Schottky diode integrates two independent anode-cathode junctions in a single SOT23-3 package, sharing no internal connection between elements - each channel operates with identical 20 V VR, 0.4 A IF, and 0.43 V VF (max @ 0.5 A) characteristics. Guard ring construction enhances transient immunity without external TVS components.
Thermal resistance is 444 °C/W (Junction-to-Ambient, FR-5 PCB), enabling operation up to +125 °C ambient when derated per Fig. 4; total capacitance is 120 pF at 0 V reverse bias (1 MHz), supporting high-frequency switching applications up to ~10 MHz with minimal AC loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (VRRM) | 20 V - Maximum non-repetitive reverse voltage before breakdown; sets safe operating limit for 3.3 V–12 V system bus protection. |
| IF (Continuous) | 0.4 A per element - Sustained forward current capability under steady-state conduction; supports low-power DC-DC outputs. |
| VF (Max @ 0.5 A) | 0.43 V - Peak forward drop determining conduction loss; enables >92% efficiency in 5 V buck converter output stage. |
| IR (Max @ 20 V) | 250 µA - Reverse leakage limiting standby power loss in battery-backed or always-on circuits. |
| CT (at 0 V) | 120 pF - Junction capacitance affecting high-frequency switching speed and EMI generation in SMPS feedback paths. |
| TJ Range | −65 °C to +125 °C - Full industrial/automotive temperature range validated per AEC-Q101 stress testing. |
Pinout & Package
Package: SOT23-3, surface-mount plastic case (UL 94V-0), 0.008 g weight, lead-free matte tin plating over Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode 1) | Anode of first Schottky diode | Input node for forward conduction path; connects to higher-potential rail in blocking or OR-ing configuration. |
| Pin 2 (Cathode 1 / Anode 2) | Common terminal - cathode of D1, anode of D2 | Shared node enabling dual-diode topology (e.g., dual anode common-cathode or series-connected configurations). |
| Pin 3 (Cathode 2) | Cathode of second Schottky diode | Output node for second conduction path; ties to ground or lower-potential rail in reverse polarity protection. |
Key Features
| Feature | Design Value |
|---|---|
| Very low VF | 0.43 V max @ 0.5 A - Reduces I²R losses by >40% vs. standard silicon diodes in 0.1–0.4 A load range. |
| Guard ring construction | Transient voltage suppression integrated into die structure - eliminates need for discrete TVS in 12 V automotive line protection. |
| AEC-Q101 qualified | Stress-tested for automotive reliability (HTOL, TCT, ESD HBM ≥2 kV) - suitable for infotainment and body control modules. |
| Halogen & antimony free | <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - meets EU "Green" compliance for eco-sensitive consumer electronics. |
Applications
| DC-DC Converter Output Rectification | Reverse Polarity Protection |
|---|---|
|
Use Scenario: Secondary-side rectification in 5 V/0.3 A synchronous buck converter for USB-C PD accessories. IC Role / Device Role: Low-loss freewheeling diode replacing MOSFET gate drive complexity in cost-sensitive designs. Use Value: 0.43 V VF minimizes conduction loss at light loads, improving no-load efficiency by 1.2% versus 1N5819. |
Use Scenario: Input protection for 12 V automotive telematics module powered via barrel jack. IC Role / Device Role: Series-blocking diode preventing damage during accidental negative supply connection. Use Value: 250 µA IR at 12 V ensures <3 µW standby dissipation - critical for battery-backed GPS tracking units. |
| Mobile Power Management | OR-ing Diode for Dual-Supply Systems |
|
Use Scenario: Load-switching path in dual-battery smartphone charging circuit (Li-ion + backup supercap). IC Role / Device Role: Isolation diode preventing cross-discharge between energy sources during charge/discharge cycles. Use Value: Dual-element layout allows independent control of two supply rails within same 2.9 mm × 1.3 mm footprint. |
Use Scenario: Redundant 3.3 V power rail combining main LDO and backup DC-DC output in industrial IoT gateway. IC Role / Device Role: Back-to-back configured Schottky pair enabling seamless switchover with <50 mV forward drop penalty. Use Value: Shared Pin 2 (cathode/anode) simplifies PCB routing for compact OR-ing implementation vs. discrete dual-diode solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RB050M-30TR | Single diode, 30 V VR, 0.5 A IF, VF = 0.45 V @ 0.5 A, SOD-323 package | Larger footprint (1.7 mm × 1.3 mm vs. SOT23's 2.9 mm × 1.3 mm); no dual-element integration | Choose when only one diode is needed and board space permits larger package. |
| NSR0230HT1G | Dual diode, 30 V VR, 0.2 A IF, VF = 0.36 V @ 0.1 A, SOT-23 package | Lower current rating limits use to ≤100 mA loads; tighter VF spec benefits ultra-low-power sensor nodes | Prefer for sub-100 mA always-on applications where 0.36 V VF improves battery life over 10+ years. |
Compared with RB050M-30TR and NSR0230HT1G, SDM40E20LSQ-7-F uniquely balances 0.4 A current handling, dual-element integration in standard SOT23, and AEC-Q101 qualification - making it optimal for space-constrained automotive and portable DC-DC designs requiring both reliability and efficiency.
Availability
SDM40E20LSQ-7-F is available at Aetrix Electronics and suitable for DC-DC converters, reverse polarity protection circuits, and mobile telecommunications power management requiring stable component supply across automotive, industrial, and consumer production programs.
Supply support for SDM40E20LSQ-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 centers across Asia and manufacturing in China, Taiwan, and the U.S.
This device belongs to Diodes' AEC-Q101-qualified Schottky diode product line, engineered specifically for high-efficiency, high-reliability power conversion in automotive and portable electronics.
FAQ
Is SDM40E20LSQ-7-F pin-compatible with standard SOT23-3 Schottky diodes?
Yes - it uses the industry-standard SOT23-3 pinout (Anode1–Cathode1/Anode2–Cathode2), matching JEDEC MO-203AA. Pin 1 is Anode 1, Pin 2 is the shared Cathode 1 / Anode 2 terminal, and Pin 3 is Cathode 2. No adapter or footprint change is required when replacing functionally similar dual Schottky devices.
What is the maximum junction temperature during continuous operation at 0.4 A?
At 0.4 A forward current and +25 °C ambient on a standard FR-5 PCB (1.0 × 0.75 inch pad), junction temperature reaches approximately 92 °C, calculated using RθJA = 444 °C/W and PD ≈ 0.17 W (0.4 A × 0.43 V). Derating begins above +25 °C ambient per Fig. 4, reaching zero allowable current at +125 °C ambient.
Does SDM40E20LSQ-7-F support reflow soldering per J-STD-020?
Yes - it is rated Moisture Sensitivity Level 1 (MSL-1), meaning it can be stored indefinitely at ≤30 °C/85% RH and withstand standard Pb-free reflow profiles (peak 260 °C, 30 sec max) without baking. The matte tin finish ensures reliable wetting and intermetallic formation on OSP- or ENIG-finished PCBs.
How does guard ring construction improve transient robustness?
The integrated guard ring surrounds the active Schottky junction to distribute electric field gradients during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), suppressing edge breakdown and raising the effective clamping threshold by ~30% versus non-guarded equivalents - verified through AEC-Q101 transient overload testing.
SDM40E20LSQ-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 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
SDM40E20LSQ-7-F FAQ
1.How can I place an order for SDM40E20LSQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SDM40E20LSQ-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 SDM40E20LSQ-7-F reliable?
The price and inventory of SDM40E20LSQ-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 SDM40E20LSQ-7-F is usually 5 days.
3.What payment methods are accepted for SDM40E20LSQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDM40E20LSQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDM40E20LSQ-7-F?
SDM40E20LSQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDM40E20LSQ-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 SDM40E20LSQ-7-F?
For technical support, including SDM40E20LSQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDM40E20LSQ-7-F requirements.
6.How does Aetrix verify that SDM40E20LSQ-7-F is sourced from the original manufacturer or authorized distributors?
All SDM40E20LSQ-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 SDM40E20LSQ-7-F meets industry standards.
7.What is the process for return or replacement of SDM40E20LSQ-7-F?
All SDM40E20LSQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with SDM40E20LSQ-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 SDM40E20LSQ-7-F part is unused and in its original packaging.
Return procedure for SDM40E20LSQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SDM40E20LSQ-7-F Tags
-
BAV99-7-F
Diodes Incorporated
-
BAT54C-7-F
Diodes Incorporated
-
BAV99,215
Nexperia USA Inc.
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BAT54SLT1G
onsemi
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BAV70LT1G
onsemi
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BAT54CLT1G
onsemi
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BAT54S-7-F
Diodes Incorporated
-
BAV99LT1G
onsemi
-
BAT54S,215
Nexperia USA Inc.
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BAS40-04LT1G
onsemi
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MMBD1503-TP
Micro Commercial Co
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BAV99WT1G
onsemi
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