My Inquiry
My Account
Diodes Incorporated SDM03U40Q-7
- Part No.:
- SDM03U40Q-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
SDM03U40Q-7.pdf
- Description:
- DIODE SCHOTTKY 30V 30MA SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:2,897
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SDM03U40Q from Diodes Incorporated is a surface-mount Schottky barrier diode in SOD523 package, rated for 40 V peak reverse voltage, 30 mA average rectified current, and 0.37 V max forward voltage at 1 mA. It features 0.5 µA max reverse leakage at 30 V and 2 pF typical capacitance at 1 V, enabling use in low-power DC-DC converters and reverse polarity protection circuits.
For engineers reviewing the SDM03U40Q datasheet, SDM03U40Q pinout, SDM03U40Q application, or SDM03U40Q equivalent, key selection criteria include its ultra-low VF (290–370 mV), AEC-Q101 qualification, SOD523 footprint compatibility, and sub-1 µA IR performance at rated VR - critical for battery-powered and automotive signal-path protection.
Technical Context
This Schottky diode uses guard ring die construction to enhance transient robustness and suppress leakage under reverse bias. Its low junction capacitance (2 pF @ 1 V) and fast switching response stem from minimal minority-carrier storage, making it suitable for high-frequency freewheeling and clamping in compact power stages.
The device operates across –40°C to +125°C with thermal resistance of 300°C/W on 1-inch² 2 oz copper, supporting reliable operation in thermally constrained automotive and portable electronics environments where low forward drop directly improves efficiency at microamp-to-milliamp load levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRM | 40 V - Maximum non-repetitive reverse voltage before breakdown; defines safe operating limit in transient-prone inputs. |
| IO(AVG) | 30 mA - Continuous DC current handling; supports low-power bias, sensing, and signal-level rectification. |
| VF(MAX) | 370 mV @ 1 mA - Ensures minimal voltage loss in logic-level clamping and battery-sense paths. |
| IR(MAX) | 0.5 µA @ 30 V - Enables stable operation in high-impedance monitoring circuits without leakage-induced offset. |
| CT | 2 pF @ 1 V, 1 MHz - Limits capacitive loading in RF detection and high-speed digital signal steering. |
| TJ Range | –40°C to +125°C - Validated for under-hood automotive and industrial ambient conditions. |
| RθJA | 300°C/W - Specifies thermal derating on standard 2 oz copper; enables predictable power dissipation up to 100 mW. |
Pinout & Package
Package: SOD523 - ultra-compact 1.25 mm × 0.85 mm surface-mount plastic case with matte tin–annealed Alloy 42 leadframe; cathode indicated by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., ground or return path) in reverse polarity protection. |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; ties to positive rail in blocking/freewheeling configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Improves ESD and surge immunity without increasing VF or leakage - critical for unshielded I/O lines. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47. |
| Lead-free & halogen-free | Meets RoHS 2 and JEDEC JS709C green standards (<900 ppm Br/Cl, <1000 ppm Sb); compatible with Pb-free reflow. |
| Low thermal resistance | RθJA = 300°C/W on 1-inch² 2 oz Cu enables >85% derated power handling vs. FR-4 mounted version (450°C/W). |
Applications
| Reverse Polarity Protection | Low-Power DC-DC Converter |
|---|---|
Use Scenario: Protecting 3.3 V or 5 V microcontroller supply rails from accidental battery reversal in portable instrumentation. IC Role / Device Role / Timing Role: Series-connected Schottky diode placed between input connector and LDO input. Use Value: 370 mV VF minimizes dropout, preserving >95% of nominal rail voltage at 10 mA load. | Use Scenario: Output rectification in 1 MHz, 100 mW synchronous buck converter for sensor node power management. IC Role / Device Role / Timing Role: Freewheeling diode during high-side FET off-time. Use Value: 2 pF CT reduces switching node ringing and EMI generation without compromising efficiency. |
| Signal-Level Clamping | Automotive CAN Bus Protection |
Use Scenario: Input protection for analog comparators interfacing with ±5 V industrial sensors. IC Role / Device Role / Timing Role: Low-capacitance clamp to VCC/GND rails limiting overvoltage transients. Use Value: Sub-1 µA IR ensures no measurable DC error injection into high-Z comparator inputs. | Use Scenario: Reverse-battery protection on 12 V CAN transceiver power input in body control modules. IC Role / Device Role / Timing Role: In-line blocking diode upstream of TJA1043 or similar transceiver. Use Value: AEC-Q101 qualification and –40°C to +125°C operation ensure compliance with ISO 16750-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RB520S-30T2R | Higher IF(AVG) = 200 mA; VF = 0.35 V @ 10 mA; SOD-523 package identical. | Supports higher-current rails but exhibits 10× higher IR (5 µA) at 30 V. | Prefer when load exceeds 30 mA and leakage tolerance >5 µA is acceptable. |
| NSR0330HT1G | Same VF spec (0.37 V @ 1 mA); IR = 0.2 µA @ 30 V; SOD-523, AEC-Q101 qualified. | Lower leakage improves precision bias networks; same thermal profile and footprint. | Choose for ultra-low-leakage requirements in sensor front-ends or battery monitoring. |
Compared with RB520S-30T2R, SDM03U40Q offers tighter IR control for signal integrity; versus NSR0330HT1G, it trades slightly higher leakage for broader manufacturer support and documented PPAP capability in automotive programs.
Availability
SDM03U40Q is available at Aetrix Electronics and suitable for reverse polarity protection, low-power DC-DC converter freewheeling, and automotive signal clamping requiring stable component supply across production lifecycles.
Supply support for SDM03U40Q 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 US.
The SDM03U40Q belongs to Diodes' automotive-qualified Schottky diode product line, engineered specifically for space-constrained, low-leakage, and high-reliability power management in infotainment, ADAS, and body electronics.
FAQ
Is SDM03U40Q suitable for 5 V USB port reverse polarity protection?
Yes. With 370 mV max VF at 1 mA and 30 mA IO rating, it delivers minimal voltage drop and sufficient current handling for low-power USB peripherals. Its 0.5 µA IR at 30 V prevents parasitic discharge in standby mode, and SOD523 footprint fits tight PCB layouts near connectors.
What is the maximum continuous forward current at 85°C ambient?
At TA = 85°C, derating applies per RθJA = 300°C/W. Junction temperature must stay ≤125°C, allowing ~133 mW max power dissipation. With VF ≈ 0.32 V at 30 mA, power is ~9.6 mW - well within limit. Thus, full 30 mA IO remains usable up to 85°C ambient on adequate copper.
Does SDM03U40Q have a specified ESD rating?
No specific HBM or CDM ESD rating is published in DS38986 Rev. 5–2. However, its guard ring die construction and AEC-Q101 qualification imply robustness against system-level transients per ISO 10605; external TVS protection is still recommended for direct I/O exposure.
Can SDM03U40Q replace BAT54S in existing SOD-523 designs?
Yes, pin-to-pin compatible with BAT54S in SOD-523. However, SDM03U40Q has lower VF (370 mV vs. 450 mV), lower IR (0.5 µA vs. 2 µA), and AEC-Q101 qualification - making it a functional upgrade for automotive or precision applications, provided layout accommodates identical thermal pad requirements.
SDM03U40Q-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 30 V
- Current - Average Rectified (Io):
- 30mA
- Voltage - Forward (Vf) (Max) @ If:
- 370 mV @ 1 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 nA @ 30 V
- Capacitance @ Vr, F:
- 2pF @ 1V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
- Operating Temperature - Junction:
- -40°C ~ 125°C
SDM03U40Q-7 FAQ
1.How can I place an order for SDM03U40Q-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SDM03U40Q-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 SDM03U40Q-7 reliable?
The price and inventory of SDM03U40Q-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDM03U40Q-7 is usually 5 days.
3.What payment methods are accepted for SDM03U40Q-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDM03U40Q-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDM03U40Q-7?
SDM03U40Q-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDM03U40Q-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 SDM03U40Q-7?
For technical support, including SDM03U40Q-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDM03U40Q-7 requirements.
6.How does Aetrix verify that SDM03U40Q-7 is sourced from the original manufacturer or authorized distributors?
All SDM03U40Q-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 SDM03U40Q-7 meets industry standards.
7.What is the process for return or replacement of SDM03U40Q-7?
All SDM03U40Q-7 units undergo pre-shipment inspection (PSI). If there is an issue with SDM03U40Q-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 SDM03U40Q-7 part is unused and in its original packaging.
Return procedure for SDM03U40Q-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SDM03U40Q-7 Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
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…
