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Diodes Incorporated SDMP0340LT-7
- Part No.:
- SDMP0340LT-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- -
- Datasheet:
-
SDMP0340LT-7.pdf
- Description:
- DIODE SCHOTTKY 40V 30MA SOT523
- Quantity:
- Payment:
- Shipping:
Inventory:8
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Product details
Overview
SDMP0340LT-7 from Diodes Incorporated is a surface-mount Schottky barrier diode in SOT-523 package, rated for 40 V peak reverse voltage and 30 mA continuous forward current, with typical forward voltage of 290 mV at 1 mA and reverse leakage ≤1.0 μA at 10 V, used in low-voltage logic clamping and signal rectification in portable electronics.
For engineers reviewing the SDMP0340LT-7 datasheet, SDMP0340LT-7 pinout, SDMP0340LT-7 application, or SDMP0340LT-7 equivalent, key selection criteria include its low VF (290–370 mV), 2 pF capacitance at 1 V, guard ring construction for transient robustness, RoHS-compliant matte tin plating, and thermal resistance of 833 °C/W on FR-4 board.
Technical Context
This Schottky diode employs guard ring die construction to suppress edge breakdown and improve transient immunity, enabling reliable operation in low-energy signal paths. Its low junction capacitance (2 pF @ 1 V) and fast recovery time support high-frequency signal steering without distortion.
The device operates across –40 °C to +125 °C and derates linearly above 25 °C ambient, delivering 150 mW power dissipation at TA = 25 °C. Its SOT-523 footprint (1.6 × 0.8 × 0.5 mm) supports ultra-compact PCB layouts in space-constrained applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse voltage before breakdown; sets safe DC blocking limit in 3.3 V/5 V rail protection |
| VF @ 1 mA | 290–370 mV - Low conduction loss enables efficient clamping in 1.8 V logic interfaces |
| IR @ 10 V | ≤1.0 μA - Minimal leakage preserves battery life in always-on sensor nodes |
| CT @ 1 V | 2 pF - Enables <1 ns signal rise/fall preservation in USB 2.0 or I²C data lines |
| RθJA | 833 °C/W - Requires minimal copper area for thermal management in passive-cooled wearables |
| IFM | 30 mA - Supports sustained current in ESD protection paths and level-shifting circuits |
Pinout & Package
Package: SOT-523 - ultra-miniature plastic surface-mount case (1.60 × 0.80 × 0.50 mm), UL 94V-0 rated, moisture sensitivity Level 1, lead-free matte tin finish over Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward current entry point | Connected to higher-potential node during conduction; polarity-marked on top surface per datasheet diagram |
| Cathode (Pin 2) | Forward current exit / reverse voltage reference | Internally tied to molded case tab; serves as ground reference in clamping configurations |
| Case (Pin 3) | Non-electrical mechanical anchor | No internal connection; provides mechanical stability only; not electrically isolated from cathode in this construction |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Suppresses edge avalanche, improving ESD robustness and long-term reliability under repetitive transients |
| Low forward voltage (290 mV typ) | Reduces voltage drop in series-connected logic-level translation paths, preserving noise margin |
| 2 pF junction capacitance | Minimizes signal loading on high-speed digital lines such as I²C clock/data or reset signals |
| SOT-523 footprint | Enables placement in <1.0 mm² board area-critical for hearing aids, TWS earbud PCBs, and medical patches |
Applications
| USB 2.0 Data Line Protection | I²C Bus Level Shifting |
|---|---|
Use Scenario: Bidirectional 480 Mbps data lines exposed to ESD events in portable peripherals. IC Role / Device Role / Timing Role: Low-capacitance clamping diode placed between D+ and D− lines and VBUS/GND rails. Use Value: 2 pF CT prevents signal integrity degradation while 40 V VRRM withstands hot-plug transients. | Use Scenario: Interfacing 1.8 V microcontroller GPIOs to 3.3 V sensor I²C bus. IC Role / Device Role / Timing Role: Passive level shifter using back-to-back Schottky configuration. Use Value: 290 mV VF ensures minimal voltage offset, maintaining valid logic thresholds across both domains. |
| Low-Power Sensor Node Clamping | Wearable Battery Monitoring |
Use Scenario: Protecting ADC inputs of sub-100 μA IoT sensors from electrostatic discharge. IC Role / Device Role / Timing Role: Signal-line transient voltage suppressor with guard ring-enhanced ruggedness. Use Value: ≤1.0 μA IR avoids measurable current draw in sleep mode; 833 °C/W RθJA allows no heatsink design. | Use Scenario: Voltage monitoring of Li-ion cells in compact hearables with tight thermal envelopes. IC Role / Device Role / Timing Role: Reverse-polarity protection diode in battery feed path. Use Value: 30 mA IFM handles peak load surges; SOT-523 fits within 1.2 mm board edge clearance constraints. |
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 IFM (200 mA), larger SOD-523 package (1.6 × 0.8 × 0.7 mm), VF = 340 mV @ 10 mA | Better surge handling but 3× higher capacitance (15 pF); unsuitable for >10 MHz signals | Choose when surge current >30 mA is required and layout allows extra height |
| BAT54C-7-F | Dual common-cathode configuration in SOT-23, VF = 320 mV @ 10 mA, CT = 10 pF @ 1 V | Offers dual-diode integration but lacks guard ring; lower thermal resistance (350 °C/W) | Select for space-constrained dual-clamp needs where single-device redundancy isn't critical |
Compared with RB520S-30T2R and BAT54C-7-F, SDMP0340LT-7 uniquely balances ultra-low capacitance (2 pF), guard ring ruggedness, and SOT-523 miniaturization-making it optimal for high-frequency, low-leakage, and size-limited signal integrity applications.
Availability
SDMP0340LT-7 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, I²C level shifting, and wearable battery monitoring requiring stable component supply across production lifecycles.
Supply support for SDMP0340LT-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, serving automotive, industrial, computing, and consumer markets with high-reliability components.
This device belongs to Diodes' SDMP low-leakage Schottky diode family, engineered specifically for signal integrity preservation and ESD-hardened clamping in battery-powered portable electronics.
FAQ
Is SDMP0340LT-7 suitable for bidirectional ESD protection on differential data lines?
Yes. Its guard ring die construction and symmetric IV characteristics enable use in back-to-back configurations across D+/D− or SDA/SCL lines. With 2 pF capacitance and ≤1.0 μA leakage, it maintains signal fidelity while meeting IEC 61000-4-2 Level 4 (±15 kV air) when paired with appropriate series impedance.
What is the maximum ambient temperature for full-rated 30 mA forward current?
At TA = 25 °C, SDMP0340LT-7 supports 30 mA continuous forward current. Above 25 °C, derating follows the curve in Figure 5: power dissipation drops linearly to zero at 150 °C ambient, meaning full IFM is only guaranteed up to ~75 °C ambient when mounted on standard FR-4 with recommended pad layout.
Does the SOT-523 package have a thermal pad or exposed cathode?
No. The SOT-523 package uses a standard two-terminal leadframe with no thermal pad or exposed metal slug. The cathode is connected to Pin 2 only; the molded plastic case provides full electrical isolation, and thermal transfer occurs solely through the leads per RθJA = 833 °C/W.
Can SDMP0340LT-7 replace BAT54 series diodes in existing designs?
Only with layout revision. While electrically similar, SDMP0340LT-7 uses SOT-523 (1.6 × 0.8 mm), whereas BAT54 variants use SOT-23 (3.0 × 1.4 mm). Pin compatibility is absent, and the lower capacitance (2 pF vs. 10 pF) may require revalidation of signal integrity in high-speed paths.
SDMP0340LT-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Technology:
- -
- Voltage - DC Reverse (Vr) (Max):
- -
- Current - Average Rectified (Io):
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Speed:
- -
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- -
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
- Operating Temperature - Junction:
- -
SDMP0340LT-7 FAQ
1.How can I place an order for SDMP0340LT-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SDMP0340LT-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 SDMP0340LT-7 reliable?
The price and inventory of SDMP0340LT-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDMP0340LT-7 is usually 5 days.
3.What payment methods are accepted for SDMP0340LT-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDMP0340LT-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDMP0340LT-7?
SDMP0340LT-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDMP0340LT-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 SDMP0340LT-7?
For technical support, including SDMP0340LT-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDMP0340LT-7 requirements.
6.How does Aetrix verify that SDMP0340LT-7 is sourced from the original manufacturer or authorized distributors?
All SDMP0340LT-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 SDMP0340LT-7 meets industry standards.
7.What is the process for return or replacement of SDMP0340LT-7?
All SDMP0340LT-7 units undergo pre-shipment inspection (PSI). If there is an issue with SDMP0340LT-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 SDMP0340LT-7 part is unused and in its original packaging.
Return procedure for SDMP0340LT-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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