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Diodes Incorporated SDM20U30Q-7
- Part No.:
- SDM20U30Q-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
SDM20U30Q-7.pdf
- Description:
- DIODE SCHOTTKY 30V 200MA SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:7,639
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Product details
Overview
SDM20U30Q from Diodes Incorporated is a surface-mount Schottky barrier diode rated for 30 V peak reverse voltage, 200 mA average forward current, and 0.5 V maximum forward voltage at 200 mA. It features negligible reverse recovery time, 20 pF typical capacitance at 0 V, and AEC-Q101 qualification for automotive-grade reliability in DC-DC converter freewheeling paths.
For engineers reviewing the SDM20U30Q datasheet, SDM20U30Q pinout, SDM20U30Q application, or SDM20U30Q equivalent, key selection criteria include its ultra-low VF at low IF, SOD523 footprint constraints, 150 µA IR at 30 V, thermal resistance of 450 °C/W on FR-4, and suitability for reverse polarity protection in space-constrained power rails.
Technical Context
This Schottky diode uses guard ring construction to enhance transient robustness and suppress leakage under high dv/dt conditions. Its low-junction-capacitance (20 pF) and absence of minority-carrier storage enable operation in high-frequency switching applications up to several MHz without tail current or recovery loss.
The device operates across –65 °C to +125 °C and achieves 1.0 A non-repetitive surge rating with minimal thermal derating on standard FR-4 layouts. Its matte tin–annealed Alloy 42 leadframe ensures solderability per MIL-STD-202 and supports reflow profiles compliant with J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 30 V - Maximum repetitive reverse blocking voltage before breakdown; sets upper limit for input rail protection in 24 V systems. |
| IO | 200 mA - Continuous DC forward current rating on FR-4 board; defines usable load range in low-power SMPS outputs. |
| VF (max) | 0.5 V @ 200 mA - Low conduction loss enables >95% efficiency in 3.3 V/5 V buck converter freewheel paths. |
| IR (max) | 150 µA @ 30 V - Minimal leakage preserves battery life in always-on reverse polarity protection circuits. |
| CT | 20 pF @ 0 V, 1 MHz - Enables clean switching waveforms in >1 MHz DC-DC controllers without snubber dependency. |
| RθJA | 450 °C/W - Thermal impedance on standard FR-4 layout; requires no heatsink below 100 mW dissipation. |
| TJ Range | –65 °C to +125 °C - Full automotive temperature support without derating; validated per AEC-Q101 stress tests. |
Pinout & Package
Package: SOD523 - ultra-small plastic surface-mount case (1.25 mm × 0.85 mm × 0.65 mm), UL 94V-0 rated, moisture sensitivity Level 1, weight ≈ 0.002 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch node in buck converter); no internal series resistance added. |
| Cathode | Forward current exit / reverse blocking terminal | Marked by cathode band; ties to higher-potential rail (e.g., output capacitor positive) for blocking or freewheeling. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring construction | Improves ESD and transient immunity without increasing leakage-critical for automotive load-dump survivability. |
| Negligible reverse recovery time | Eliminates reverse recovery charge (Qrr ≈ 0), removing switching loss and EMI in high-frequency converters. |
| Ultra-small SOD523 footprint | Reduces PCB area by >50% vs. SOD-123; enables dense power stage layouts in wearables and ADAS modules. |
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, HTRB, and ESD testing-supports PPAP documentation. |
Applications
| SMPS Output Rectification | DC-DC Converter Freewheeling |
|---|---|
Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering ≤200 mA at 3.3–12 V. IC Role / Device Role: Unidirectional current path replacing synchronous MOSFETs where cost and simplicity outweigh efficiency gains. Use Value: 0.5 V VF minimizes conduction loss at light loads; 20 pF CT avoids resonance with transformer leakage inductance. | Use Scenario: Freewheeling path in non-synchronous buck regulators powering microcontrollers or sensors. IC Role / Device Role: Provides low-loss return path during high-side switch off-time; clamps inductive kickback. Use Value: Near-zero Qrr prevents voltage overshoot spikes; AEC-Q101 rating ensures reliability in engine control modules. |
| Reverse Polarity Protection | Blocking Diode in Battery Circuits |
Use Scenario: In-line protection for 12 V automotive accessories against accidental battery reversal. IC Role / Device Role: Series-blocking diode placed between power input and system ground plane. Use Value: 150 µA IR at 30 V prevents measurable standby drain; SOD523 fits tight connector footprints. | Use Scenario: Isolation diode between dual Li-ion cells or backup coin cell and main supply rail. IC Role / Device Role: Prevents backfeed from primary source into secondary battery during charging or fault conditions. Use Value: 0.15 V VF at 100 µA enables ultra-low quiescent current operation; -65 °C rating supports cold-cranking environments. |
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 | Same VRRM (30 V), but IO = 200 mA, VF = 0.35 V @ 100 mA; SOD-523 package; not AEC-Q101 qualified. | Lacks automotive qualification and PPAP support; suitable only for commercial-grade portable electronics. | Select when AEC-Q101 is not required and lower VF at light load is prioritized. |
| NSR0230P2T5G | VRRM = 30 V, IO = 200 mA, VF = 0.45 V @ 200 mA; SOD-523; AEC-Q101 qualified but IR = 500 µA @ 30 V. | Higher leakage limits use in always-on battery monitoring; otherwise matches automotive thermal and surge specs. | Select when higher surge tolerance (IFSM = 1.5 A) is needed, accepting trade-off in reverse leakage. |
Compared with RB520S-30T2R and NSR0230P2T5G, SDM20U30Q uniquely balances AEC-Q101 compliance, 150 µA IR, and 0.5 V VF at full rated current-making it optimal for automotive DC-DC freewheeling where leakage and qualification are jointly critical.
Availability
SDM20U30Q is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial sensor node DC-DC converters, and wearable device reverse polarity protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SDM20U30Q 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 SDM20U30Q belongs to Diodes' automotive-qualified Schottky diode product line, engineered specifically for high-reliability power management in harsh-environment vehicle subsystems.
FAQ
What is the maximum junction temperature for continuous operation?
The SDM20U30Q has an operating junction temperature range of –65 °C to +125 °C. At ambient temperatures up to +85 °C on FR-4 with recommended pad layout, it sustains 200 mA continuously without exceeding 125 °C junction temperature, given its 450 °C/W RθJA.
Is the SDM20U30Q compatible with lead-free reflow processes?
Yes. The device uses matte tin–annealed Alloy 42 leadframe and is fully RoHS 3 compliant. It meets J-STD-020 Level 1 moisture sensitivity and is qualified for standard Pb-free reflow profiles, including peak temperatures up to 260 °C.
Does the cathode band indicate pin 1 or pin 2 in SOD523?
In the SOD523 package, the cathode band marks the cathode terminal-pin 2. The anode is the unmarked end. This matches JEDEC-standard SOD523 pinout and Diodes' marking diagram showing "LM" code adjacent to the cathode band.
How does the guard ring construction improve reliability?
The guard ring reduces electric field crowding at the silicon edge, suppressing premature avalanche and improving resistance to EOS and ESD transients. In practice, this extends device lifetime under load-dump conditions (ISO 7637-2 Pulse 5a) and improves parametric stability after temperature cycling.
SDM20U30Q-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):
- 200mA
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 200 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 150 µA @ 30 V
- Capacitance @ Vr, F:
- 20pF @ 0V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
- Operating Temperature - Junction:
- -65°C ~ 125°C
SDM20U30Q-7 FAQ
1.How can I place an order for SDM20U30Q-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SDM20U30Q-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 SDM20U30Q-7 reliable?
The price and inventory of SDM20U30Q-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDM20U30Q-7 is usually 5 days.
3.What payment methods are accepted for SDM20U30Q-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDM20U30Q-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDM20U30Q-7?
SDM20U30Q-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDM20U30Q-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 SDM20U30Q-7?
For technical support, including SDM20U30Q-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDM20U30Q-7 requirements.
6.How does Aetrix verify that SDM20U30Q-7 is sourced from the original manufacturer or authorized distributors?
All SDM20U30Q-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 SDM20U30Q-7 meets industry standards.
7.What is the process for return or replacement of SDM20U30Q-7?
All SDM20U30Q-7 units undergo pre-shipment inspection (PSI). If there is an issue with SDM20U30Q-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 SDM20U30Q-7 part is unused and in its original packaging.
Return procedure for SDM20U30Q-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SDM20U30Q-7 Tags
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