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Diodes Incorporated SDM1M40LP8Q-7
- Part No.:
- SDM1M40LP8Q-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- 2-UFDFN
- Datasheet:
-
SDM1M40LP8Q-7.pdf
- Description:
- DIODE SCHOTT 40V 1A U-DFN1608-2
- Quantity:
- Payment:
- Shipping:
Inventory:5,580
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Product details
Overview
SDM1M40LP8Q-7 from Diodes Incorporated is a 40 V, 1 A surface-mount Schottky rectifier in U-DFN1608-2 package, featuring 0.66 V max forward voltage at 1 A/25°C, 0.02 mA max reverse leakage at 40 V/25°C, and 8.4 ns typical reverse recovery time. It serves as a freewheel or blocking diode in DC-DC converters and AC-DC adapters requiring high-temperature stability and low conduction loss.
For engineers reviewing the SDM1M40LP8Q-7 datasheet, SDM1M40LP8Q-7 pinout, SDM1M40LP8Q-7 application, or SDM1M40LP8Q-7 equivalent, key selection criteria include its AEC-Q101 qualification, IATF 16949 manufacturing, ultra-low VF at elevated temperature, and tight IR control up to +125°C - critical for automotive power rail and compact industrial SMPS designs.
Technical Context
This Schottky diode uses a planar metal-semiconductor junction optimized for low forward voltage and thermally stable reverse leakage. Its 0.42 V typical VF at 0.5 A/125°C and 0.004 mA IR at 40 V/125°C enable reliable operation in high-ambient environments without thermal runaway.
The U-DFN1608-2 package delivers 130 °C/W junction-to-ambient thermal resistance on FR-4 with 1-inch² 2 oz copper pad, supporting continuous 1 A average current up to +100°C ambient per derating curve. Reverse recovery time of 8.4 ns minimizes switching losses in high-frequency buck and flyback topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse voltage before breakdown; sets safe blocking margin in 24 V and 36 V automotive and industrial rails. |
| IO (AVG) | 1 A - Continuous average forward current rating; supports compact 5–10 W DC-DC stages without heatsinking at ≤+100°C ambient. |
| VF (MAX) | 0.66 V @ 1 A, 25°C - Low conduction loss enables >95% efficiency in 5 V output buck converters at full load. |
| IR (MAX) | 0.02 mA @ 40 V, 25°C - Ultra-low leakage preserves standby power budget and prevents thermal drift in high-density layouts. |
| tRR | 8.4 ns - Fast recovery reduces switching node ringing and EMI in >500 kHz switching regulators. |
| RθJA | 130 °C/W - Thermal performance validated on standard FR-4 PCB; enables direct integration into space-constrained modules. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive discrete semiconductors, including HTGB, HTRB, and TCT. |
Pinout & Package
U-DFN1608-2 is a 2-terminal, bottom-side thermal pad-free, leadless plastic package measuring 0.80 × 0.61 mm with 0.41 mm terminal length. Cathode marked by dot on top surface; terminals are NiPdAu-plated copper leadframe, solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input/source side in rectifier/freewheel configuration; requires low-impedance trace for surge current handling. |
| Cathode | Forward current exit / reverse blocking node | Marked with dot; ties to switching node or output rail; must be routed away from noise-sensitive analog sections. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low VF at high temperature | 0.55 V @ 1 A, 125°C - Reduces conduction loss by ≥15% vs. standard Schottkys, lowering MOSFET die temperature in synchronous rectification. |
| Stable high-temp IR | 0.004 mA @ 40 V, 125°C - Prevents thermal runaway in sealed enclosures operating at +105°C ambient. |
| AEC-Q101 qualification | PPAP-capable, IATF 16949 manufactured - Enables direct use in ASIL-B power subsystems without additional qualification effort. |
| Green, halogen-free construction | <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - Complies with IPC-1752A material declaration requirements for Tier 1 automotive supply chain. |
Applications
| Automotive Body Control Module (BCM) | Industrial DC-DC Converter |
|---|---|
Use Scenario: Reverse polarity protection and load dump clamping in 12 V/24 V BCM power inputs. IC Role / Device Role / Timing Role: Blocking diode preventing battery backfeed during ignition-off; handles 8 A surge per ISO 7637-2 Pulse 5a. Use Value: 0.66 V VF limits voltage drop to <0.7 V at 1 A, preserving microcontroller brown-out margin under cold-crank conditions. | Use Scenario: Output rectification in isolated 5 V/2 A flyback converter for PLC I/O modules. IC Role / Device Role / Timing Role: Freewheel diode conducting during transformer reset phase; operates continuously at 100 kHz switching frequency. Use Value: 8.4 ns tRR suppresses voltage spikes across primary MOSFET, reducing need for snubber components and board area. |
| USB-C Power Delivery Adapter | Medical Portable Monitor Power Rail |
Use Scenario: Secondary-side synchronous rectification in 20 V/3 A GaN-based USB-PD adapter. IC Role / Device Role / Timing Role: High-efficiency rectifier replacing MOSFET gate driver complexity; placed adjacent to secondary winding. Use Value: 0.42 V VF at 125°C maintains >93% conversion efficiency at full load and 50°C case temperature. | Use Scenario: Input protection and isolation in 3.3 V/500 mA LDO-fed display backlight circuit. IC Role / Device Role / Timing Role: Blocking diode isolating backup battery from main supply during power failover events. Use Value: 0.0006 mA IR at 10 V/25°C ensures <1 µW standby drain, extending battery life beyond 72 hours in sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SBM140T1G | Same 40 V/1 A rating but SOD-123 package; VF = 0.55 V @ 1 A/25°C; RθJA = 190 °C/W. | Larger footprint (3.5 × 1.6 mm); unsuitable for ultra-dense layouts; lower thermal performance limits current in confined spaces. | Select when legacy SMT placement equipment lacks U-DFN capability or when manual rework is required. |
| RB050M-30 | 40 V/1 A, 0.52 V VF @ 1 A/25°C, but TO-277 package; RθJA = 100 °C/W; not AEC-Q101 qualified. | Thicker profile (1.1 mm height); requires more board volume; lacks automotive qualification and PPAP support. | Select only for non-automotive industrial use where thermal headroom exceeds 25°C and qualification is not mandated. |
Compared with SBM140T1G and RB050M-30, SDM1M40LP8Q-7 uniquely combines AEC-Q101 compliance, U-DFN1608-2 miniaturization, and sub-0.6 V VF at 125°C - making it the sole choice for space- and reliability-constrained automotive and portable medical power stages.
Availability
SDM1M40LP8Q-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC-DC converters, USB-C power delivery adapters, and medical portable monitor power rails requiring stable component supply across extended temperature and qualification-critical programs.
Supply support for SDM1M40LP8Q-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 SDM1M40LP8Q-7 belongs to Diodes' automotive-grade Schottky rectifier product line, engineered specifically for high-reliability power conversion in engine compartments, ADAS ECUs, and infotainment systems operating up to +150°C junction temperature.
FAQ
Is SDM1M40LP8Q-7 suitable for synchronous rectification in 500 kHz DC-DC converters?
Yes. With 8.4 ns reverse recovery time and low 0.66 V forward voltage, it minimizes switching losses and conduction loss in high-frequency buck and flyback topologies. Its thermal resistance of 130 °C/W on standard FR-4 allows sustained 1 A operation up to +100°C ambient at 500 kHz.
What is the cathode marking method for SDM1M40LP8Q-7?
The cathode is marked by a single dot on the top surface of the U-DFN1608-2 package, located near one corner. The device has two terminals only - anode and cathode - with no internal connection to the exposed pad, which is electrically isolated.
Does SDM1M40LP8Q-7 require derating for capacitive loads?
Yes. Per datasheet maximum ratings, average rectified current must be derated by 20% when used with capacitive loads due to higher peak currents. For a 1 A rated device, limit continuous current to 0.8 A in capacitor-input filter applications.
Can SDM1M40LP8Q-7 replace through-hole Schottky diodes like 1N5819 in existing designs?
No direct replacement: SDM1M40LP8Q-7 is a 2-terminal surface-mount device in U-DFN1608-2 (0.80 × 0.61 mm), while 1N5819 uses DO-41 through-hole package. Layout redesign and requalification are required due to footprint, thermal path, and soldering process differences.
SDM1M40LP8Q-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 2-UFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 660 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 8.4 ns
- Current - Reverse Leakage @ Vr:
- 20 µA @ 40 V
- Capacitance @ Vr, F:
- 25pF @ 5V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-DFN1608-2
- Operating Temperature - Junction:
- -65°C ~ 150°C
SDM1M40LP8Q-7 FAQ
1.How can I place an order for SDM1M40LP8Q-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SDM1M40LP8Q-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 SDM1M40LP8Q-7 reliable?
The price and inventory of SDM1M40LP8Q-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDM1M40LP8Q-7 is usually 5 days.
3.What payment methods are accepted for SDM1M40LP8Q-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDM1M40LP8Q-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDM1M40LP8Q-7?
SDM1M40LP8Q-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDM1M40LP8Q-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 SDM1M40LP8Q-7?
For technical support, including SDM1M40LP8Q-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDM1M40LP8Q-7 requirements.
6.How does Aetrix verify that SDM1M40LP8Q-7 is sourced from the original manufacturer or authorized distributors?
All SDM1M40LP8Q-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 SDM1M40LP8Q-7 meets industry standards.
7.What is the process for return or replacement of SDM1M40LP8Q-7?
All SDM1M40LP8Q-7 units undergo pre-shipment inspection (PSI). If there is an issue with SDM1M40LP8Q-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 SDM1M40LP8Q-7 part is unused and in its original packaging.
Return procedure for SDM1M40LP8Q-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SDM1M40LP8Q-7 Tags
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