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Diodes Incorporated SDM0440S3F-7
- Part No.:
- SDM0440S3F-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
SDM0440S3F-7.pdf
- Description:
- Schottky Diode SOD323F T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,601
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Product details
Overview
SDM0440S3F-7 from Diodes Incorporated is a surface-mount Schottky barrier diode optimized for low-loss polarity protection and recirculation in space-constrained DC power paths. It delivers 40 V peak reverse voltage, 400 mA continuous forward current, 0.70 V max forward voltage at 400 mA, 20.0 µA max reverse leakage at 40 V, and 4.5 ns typical reverse recovery time - enabling efficient operation in USB-powered peripherals and battery management circuits.
For engineers reviewing the SDM0440S3F-7 datasheet, SDM0440S3F-7 pinout, SDM0440S3F-7 application, or SDM0440S3F-7 equivalent, key selection criteria include forward voltage drop at rated current, reverse leakage under full-rated VR, junction capacitance at zero bias, thermal resistance (350 °C/W), and SOD323F package compatibility with high-density PCB layouts.
Technical Context
This Schottky diode uses a planar guard ring construction to suppress transient-induced failure and sustain reliable operation across –65 °C to +150 °C ambient. Its negligible reverse recovery time (<5 ns) and low 38 pF junction capacitance eliminate switching losses in high-frequency rectification and flyback snubbing applications.
The device operates without minority-carrier storage delay, making it suitable for fast-switching DC/DC converter outputs and reverse-polarity protection where rapid turn-off prevents backfeed during hot-swap events. Its 350 mW power dissipation rating assumes standard FR-4 mounting with 2 oz copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage before breakdown; sets upper limit for input rail protection in 24 V systems. |
| IFM | 400 mA - Continuous forward current rating; defines steady-state load capability in always-on power rails. |
| VF @ 400 mA | 0.70 V max - Forward voltage drop at full rated current; directly determines conduction loss (0.28 W) and self-heating. |
| IR @ 40 V | 20.0 µA max - Reverse leakage at full rated VR; critical for low-power sleep-mode integrity in battery-backed devices. |
| tRR | 4.5 ns typical - Reverse recovery time; enables clean commutation in >1 MHz switching topologies without ringing. |
| CT @ 0 V | 38 pF typical - Junction capacitance at zero bias; limits high-frequency impedance and EMI generation in RF-adjacent layouts. |
| RθJA | 350 °C/W - Thermal resistance junction-to-ambient; used to calculate temperature rise (ΔT = PD × RθJA) on standard PCBs. |
Pinout & Package
Package: SOD323F - ultra-small plastic surface-mount package (1.25 mm × 1.70 mm × 0.95 mm), moisture sensitivity level 1, matte tin-plated terminals, cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to positive supply or switched node; must handle 2.5 A non-repetitive surge during fault conditions. |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; ties to system ground or return path; reverse leakage flows here under blocking bias. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring construction | Enhances ESD and transient robustness without derating VR or IF - validated per JEDEC high-reliability standards. |
| Negligible reverse recovery | Eliminates minority-carrier tail current, preventing shoot-through in synchronous rectifier control loops. |
| Low VF at 400 mA | Reduces conduction loss by ≥30% vs. comparable silicon diodes, improving efficiency in 5–24 V portable power rails. |
| SOD323F footprint | Enables placement in <1.5 mm² board area - ideal for USB-C PD adapters, wearables, and IoT sensor nodes. |
Applications
| USB Power Delivery Protection | Battery Charging Path Control |
|---|---|
Use Scenario: Prevents reverse current flow from VBUS into host controller during cable disconnect or source swap in USB-C PD systems. IC Role / Device Role / Timing Role: Polarity protection diode placed between connector and PMIC input. Use Value: 0.70 V VF minimizes voltage drop across 5–20 V input rails, preserving headroom for downstream regulation. | Use Scenario: Blocks reverse discharge from Li-ion battery into charging IC when input power is removed. IC Role / Device Role / Timing Role: Isolation diode in linear charger or buck-boost charge path. Use Value: 20.0 µA IR at 40 V ensures <1 µA standby drain - extending shelf life of sealed battery packs. |
| DC/DC Converter Output Rectification | Industrial Sensor Signal Conditioning |
Use Scenario: Freewheeling path in non-synchronous buck converters operating up to 2 MHz. IC Role / Device Role / Timing Role: Synchronous rectifier replacement in cost-sensitive 12 V → 3.3 V supplies. Use Value: 4.5 ns tRR avoids overlap conduction loss, maintaining >92% efficiency at 500 kHz switching. | Use Scenario: Input protection for analog front-end amplifiers exposed to field wiring transients. IC Role / Device Role / Timing Role: Clamp diode across differential signal pair or supply rail. Use Value: Guard ring structure withstands ±1 kV ESD per IEC 61000-4-2 without parameter shift. |
Availability
SDM0440S3F-7 is available at Aetrix Electronics and suitable for USB-C PD adapters, battery management subsystems, industrial sensor modules, and compact DC/DC power supplies requiring stable component supply and consistent parametric performance across production lots.
Supply support for SDM0440S3F-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, specializing in high-efficiency power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The SDM series targets ultra-compact Schottky rectification with enhanced reliability - designed specifically for space-limited, thermally constrained applications where low VF, low IR, and fast switching are mandatory.
FAQ
What is the maximum junction temperature for SDM0440S3F-7?
The SDM0440S3F-7 has an absolute maximum junction temperature of +150 °C, with a specified operating range from –65 °C to +150 °C. Derating begins at +25 °C ambient, following the curve in Figure 4: at +85 °C ambient, the average forward current must be reduced to ~0.2 A to maintain safe thermal operation.
Is SDM0440S3F-7 automotive-grade qualified?
No - SDM0440S3F-7 is an industrial-grade part. For automotive applications, Diodes offers the Q-suffix variant SDM0440S3FQ-7, which is AEC-Q101 qualified, PPAP-capable, and manufactured in IATF 16949 certified facilities. The base part lacks automotive change control and qualification documentation.
How does the SOD323F package affect thermal performance?
The SOD323F package delivers 350 °C/W junction-to-ambient thermal resistance on standard FR-4 with 2 oz copper. Its small size limits heat spreading, so thermal relief pads and adjacent copper pours are recommended. Power dissipation must stay ≤350 mW at +25 °C ambient to avoid exceeding TJ(max).
Can SDM0440S3F-7 replace a 1N5819 in existing designs?
Yes - SDM0440S3F-7 matches the 1N5819's 40 V/1 A rating but improves on VF (0.70 V vs. 0.9 V at 400 mA), tRR (<5 ns vs. ~30 ns), and CT (38 pF vs. ~110 pF). However, its lower IFM (400 mA vs. 1 A) requires verification of peak current demands before substitution.
SDM0440S3F-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 400mA
- Voltage - Forward (Vf) (Max) @ If:
- 700 mV @ 400 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 4.5 ns
- Current - Reverse Leakage @ Vr:
- 20 µA @ 40 V
- Capacitance @ Vr, F:
- 38pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323F
- Operating Temperature - Junction:
- -65°C ~ 150°C
SDM0440S3F-7 FAQ
1.How can I place an order for SDM0440S3F-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SDM0440S3F-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 SDM0440S3F-7 reliable?
The price and inventory of SDM0440S3F-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDM0440S3F-7 is usually 5 days.
3.What payment methods are accepted for SDM0440S3F-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDM0440S3F-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDM0440S3F-7?
SDM0440S3F-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDM0440S3F-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 SDM0440S3F-7?
For technical support, including SDM0440S3F-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDM0440S3F-7 requirements.
6.How does Aetrix verify that SDM0440S3F-7 is sourced from the original manufacturer or authorized distributors?
All SDM0440S3F-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 SDM0440S3F-7 meets industry standards.
7.What is the process for return or replacement of SDM0440S3F-7?
All SDM0440S3F-7 units undergo pre-shipment inspection (PSI). If there is an issue with SDM0440S3F-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 SDM0440S3F-7 part is unused and in its original packaging.
Return procedure for SDM0440S3F-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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