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Diodes Incorporated BAS40W-7-F
- Part No.:
- BAS40W-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BAS40W-7-F.pdf
- Description:
- DIODE SCHOTTKY 40V 200MA SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:8,329
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Product details
Overview
BAS40W-7-F from Diodes Incorporated is a surface-mount Schottky barrier diode in SOT323 package, rated for 40 V peak repetitive reverse voltage and 200 mA forward current, with 380 mV typical forward voltage at 1 mA and 5 ns reverse recovery time-used in high-frequency rectification and polarity protection circuits in portable power management.
For engineers reviewing the BAS40W-7-F datasheet, BAS40W-7-F pinout, BAS40W-7-F application, or BAS40W-7-F equivalent, key selection criteria include low VF for efficiency-critical DC-DC bias rails, fast trr for switching node snubbing, ultra-small SOT323 footprint for space-constrained PCBs, and ESD-protected junction guard ring for robustness in handheld interfaces.
Technical Context
This Schottky diode employs a platinum-silicide (PtSi) or similar low-barrier metal-semiconductor junction to achieve low forward voltage drop and minimal minority-carrier storage, enabling nanosecond-scale switching without tail current. Its guard-ringed PN structure suppresses edge breakdown and enhances transient immunity beyond standard Schottky designs.
The device operates across –55°C to +125°C ambient, with thermal resistance of 625°C/W (junction-to-ambient, FR4 board), and derates linearly above 25°C per Fig. 4-making it suitable for thermally isolated low-power signal path clamping where self-heating must remain below 10°C rise at 100 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking capability without avalanche conduction |
| IF(AV) | 200 mA - Continuous forward current rating on standard FR4 PCB with recommended pad layout |
| VF @ 1 mA | 380 mV - Low conduction loss in bias supply and signal-level clamping applications |
| trr | 5.0 ns - Enables use in >100 MHz switching node snubbers and RF detector circuits |
| CT @ 0 V | 5.0 pF - Minimal capacitive loading on high-speed signal lines and oscillator feedback paths |
| IR @ 30 V | 200 nA - Sufficient leakage suppression for battery-backed real-time clock backup diodes |
| RθJA | 625 °C/W - Requires thermal-aware layout for sustained >100 mA operation in enclosed enclosures |
Pinout & Package
Package: SOT323 - ultra-small plastic surface-mount package (2.0 × 2.2 mm body, 0.9 mm height), lead-free, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward current entry point | Connected to higher-potential node in reverse polarity protection or cathode-anode clamp configurations |
| Cathode (Pin 2) | Forward current exit / reverse blocking terminal | Typically tied to system ground or regulated rail return; carries full reverse voltage during off-state |
| Collector/Case (Pin 3) | Thermal and mechanical anchor | Non-electrical; internal die attach paddle-must be soldered to copper pour for thermal relief and mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage (VF) | 380 mV @ 1 mA enables >95% efficiency in 3.3 V LDO input protection and USB VBUS line clamping |
| Fast reverse recovery (trr) | 5 ns supports clean switching in 2.4 GHz ISM band RF detector front-ends and synchronous rectifier gate drive snubbers |
| Guard-ringed junction | ESD-rated to IEC 61000-4-2 Level 4 (±8 kV contact) without external TVS in many portable designs |
| SOT323 footprint | 0.006 g mass and 2.0 × 2.2 mm outline allow placement adjacent to QFN microcontrollers in wearables and hearing aids |
Applications
| USB Power Path Protection | RF Detector Clamp |
|---|---|
Use Scenario: Preventing backfeed from downstream USB peripherals into host VBUS during hot-plug events. IC Role / Device Role / Timing Role: Reverse polarity protection diode placed between VBUS and load switch input. Use Value: 380 mV VF minimizes voltage drop across protection path, preserving 5.0 V ±5% compliance at 200 mA load. | Use Scenario: Clamping RF detector output to prevent op-amp input saturation in 2.4 GHz WiFi receiver RSSI circuits. IC Role / Device Role / Timing Role: Signal-level AC coupling and peak voltage limiter at detector output node. Use Value: 5 pF CT and 5 ns trr avoid phase distortion and ringing in <10 ns pulse envelope detection. |
| Low-Power RTC Backup | High-Speed Logic-Level Shifter |
Use Scenario: Isolating coin-cell backup supply from main system rail in real-time clock modules. IC Role / Device Role / Timing Role: Leakage-blocking diode in battery switchover path. Use Value: 200 nA IR at 30 V ensures <1 μA total quiescent drain, extending CR2032 life beyond 5 years. | Use Scenario: Level-shifting I²C signals between 1.8 V microcontroller GPIO and 3.3 V sensor interface. IC Role / Device Role / Timing Role: Bidirectional passive shifter using Schottky forward conduction threshold. Use Value: Sub-400 mV VF allows reliable turn-on at 1.8 V logic high, supporting 1 MHz I²C Fast Mode timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MBR0540T1G | Higher IF(AV) = 500 mA, larger SOT23 package, VF = 450 mV @ 10 mA | Better suited for 5 V/500 mA DC-DC output rectification; not space-compatible with SOT323 layouts | Select when thermal margin >150°C/W required and board area permits 2.9 × 1.3 mm footprint |
| NSR0230HT1G | Lower VF = 275 mV @ 10 mA, same SOT323, but IR = 500 nA @ 30 V and trr = 10 ns | Preferred for ultra-low-loss bias rails; less effective for RF clamping due to slower recovery | Choose for battery-sensitive applications where leakage dominates lifetime, not speed |
Compared with MBR0540T1G and NSR0230HT1G, BAS40W-7-F uniquely balances ultra-small size, sub-400 mV VF at microamp bias, and 5 ns trr-making it optimal for space- and speed-constrained signal-path protection where moderate current and low leakage are jointly critical.
Availability
BAS40W-7-F is available at Aetrix Electronics and suitable for USB power path protection, RF detector clamping, low-power RTC backup, and high-speed logic-level shifting requiring stable component supply and consistent SOT323 form factor.
Supply support for BAS40W-7-F 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 BAS40W series belongs to Diodes' high-speed Schottky diode product line, engineered specifically for compact, low-loss, high-frequency signal and power path protection in portable and wireless electronics.
FAQ
What is the maximum junction temperature for continuous operation?
The BAS40W-7-F has an operating junction temperature range of –55°C to +125°C. Under continuous 200 mA forward current on a standard FR4 board with recommended pad layout, junction temperature rise is limited by its 625°C/W RθJA-requiring ambient ≤85°C to stay within 125°C max. Derating begins linearly above 25°C ambient per Figure 4.
Is BAS40W-7-F suitable for automotive applications?
No-the BAS40W-7-F is not qualified to AEC-Q101. Diodes offers the automotive-grade BAS40WQ variant (separate datasheet DS30114Q) with extended temperature screening, enhanced process controls, and PPAP documentation for under-hood and infotainment systems.
How does the guard ring improve ESD robustness?
The integrated PN junction guard ring surrounds the active Schottky region to distribute electric field stress and suppress edge breakdown during ESD transients. This structure enables the device to withstand ≥8 kV contact discharge (IEC 61000-4-2 Level 4) without external protection in many handheld designs.
Can BAS40W-7-F replace BAT54 in existing designs?
Yes-BAS40W-7-F shares the same SOT323 package, pinout, and polarity marking as BAT54, with lower VF (380 mV vs. 450 mV @ 1 mA) and faster trr (5 ns vs. 6 ns). No layout change is needed, and performance improves in low-current bias and high-frequency clamping roles.
BAS40W-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 200mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 40 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 5 ns
- Current - Reverse Leakage @ Vr:
- 200 nA @ 30 V
- Capacitance @ Vr, F:
- 5pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
- Operating Temperature - Junction:
- -55°C ~ 125°C
BAS40W-7-F FAQ
1.How can I place an order for BAS40W-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS40W-7-F 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 BAS40W-7-F reliable?
The price and inventory of BAS40W-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS40W-7-F is usually 5 days.
3.What payment methods are accepted for BAS40W-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS40W-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS40W-7-F?
BAS40W-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS40W-7-F 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 BAS40W-7-F?
For technical support, including BAS40W-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS40W-7-F requirements.
6.How does Aetrix verify that BAS40W-7-F is sourced from the original manufacturer or authorized distributors?
All BAS40W-7-F 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 BAS40W-7-F meets industry standards.
7.What is the process for return or replacement of BAS40W-7-F?
All BAS40W-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BAS40W-7-F, 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 BAS40W-7-F part is unused and in its original packaging.
Return procedure for BAS40W-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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