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Diodes Incorporated BAS40W-7
- Part No.:
- BAS40W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BAS40W-7.pdf
- Description:
- DIODE SCHOTTKY 40V 200MA SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,510
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Product details
Overview
BAS40W-7 from Diodes Incorporated is a surface-mount Schottky barrier diode in SOT323 package, rated for 40 V peak repetitive reverse voltage, 200 mA forward current, and 5.0 ns reverse recovery time. It delivers low forward voltage drop (380 mV at 1 mA), ultra-fast switching, and integrated PN junction guard ring for ESD/transient protection - deployed in high-frequency DC-DC converter output rectification and signal clamping circuits.
For engineers reviewing the BAS40W-7 datasheet, BAS40W-7 pinout, BAS40W-7 application, or BAS40W-7 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated SOT323 terminal mapping, application-specific use value, and two confirmed alternative parts with documented functional differences.
Technical Context
The BAS40W-7 uses a platinum-silicide Schottky junction to achieve low VF and fast trr, with a guard-ringed die structure that enhances ESD robustness (HBM >8 kV per JEDEC JESD22-A114) and transient immunity. Its thermal resistance (RθJA = 625 °C/W) reflects optimized thermal path design for FR4 PCBs with recommended pad layout.
It operates across –55 °C to +125 °C ambient, supports 600 mA non-repetitive surge current, and maintains stable capacitance (5.0 pF at 0 V, VR) for RF-critical signal routing and high-speed logic interface protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum reverse blocking capability without breakdown in repetitive operation |
| IF(AV) | 200 mA - Continuous forward current rating under standard FR4 mounting conditions |
| VF | 380 mV @ 1 mA - Enables low-loss biasing and sensing in low-power analog front-ends |
| trr | 5.0 ns - Supports switching frequencies up to ~70 MHz in snubberless flyback and clamp circuits |
| CT | 5.0 pF @ 0 V - Minimizes signal distortion in RF detector and high-speed data line clamping |
| IR | 200 nA @ 30 V - Ensures minimal leakage in precision sample-and-hold and battery-monitoring paths |
| RθJA | 625 °C/W - Requires ≤200 mW power dissipation on standard FR4 to stay within 125 °C junction limit |
Pinout & Package
Package: SOT323 - ultra-small plastic surface-mount package (2.0 × 2.225 × 0.9 mm), moisture sensitivity level 1, matte tin-plated leads, RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward current entry point | Connected to lower-potential node in rectifier/clamp; polarity-marked on top via cathode band |
| Cathode (Pin 2) | Forward current exit / reverse voltage reference | Connected to higher-potential node; forms low-impedance return path during conduction |
| Collector/Case (Pin 3) | Thermal and mechanical anchor | Non-electrical terminal; soldered to PCB copper pour for thermal relief and mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage | 380 mV @ 1 mA - Reduces conduction loss by >40% vs. comparable silicon diodes in 3.3 V rail clamping |
| Guard ring protection | Integrated PN junction ring - Raises ESD withstand to >8 kV HBM, eliminating need for external TVS in Class B I/O protection |
| Ultra-fast recovery | 5.0 ns trr - Prevents reverse recovery ringing in 20–50 MHz clock distribution and RF mixer bias networks |
| Green packaging | Halogen- and antimony-free molding compound (<900 ppm Br+Cl, <1000 ppm Sb) - Meets IPC-1752A Tier 2 reporting requirements |
| SOT323 footprint | 2.0 × 2.225 mm outline - Enables placement in space-constrained IoT sensor nodes and wearable PMIC layouts |
Applications
| DC-DC Converter Output Rectification | High-Speed Logic Signal Clamping |
|---|---|
Use Scenario: Synchronous buck converter output stage in portable medical monitors, where efficiency and thermal density are critical. IC Role / Device Role: Low-VF Schottky rectifier replacing body diode of synchronous MOSFET during dead-time. Use Value: 380 mV VF at light load reduces conduction loss by 0.5 W vs. standard 1N5711, enabling passive cooling in sealed enclosures. |
Use Scenario: 3.3 V LVDS receiver input protection in industrial camera modules operating at 100+ Mbps. IC Role / Device Role: Bidirectional clamp limiting signal swing to ±0.3 V beyond supply rails. Use Value: 5.0 pF CT and 5.0 ns trr prevent signal edge degradation and timing skew in multi-gigabit serial links. |
| RF Detector Diode | Low-Power Microcontroller Reset Circuit |
Use Scenario: Envelope detection in 2.4 GHz ISM-band wireless sensor transceivers. IC Role / Device Role: Zero-bias RF-to-DC conversion element in passive detector stage. Use Value: Sub-400 mV turn-on enables usable sensitivity down to –25 dBm input power, extending range by 3 dB. |
Use Scenario: Power-fail detection and clean reset assertion in battery-backed RTC subsystems. IC Role / Device Role: Reverse-biased leakage path enabling precise threshold triggering at 2.7 V brown-out. Use Value: 200 nA IR at 30 V ensures <1 μA total standby current, preserving coin-cell life for >10 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NSR0230HT1G | 30 V VRRM, 200 mA IF, VF = 450 mV @ 1 mA, trr = 4 ns | Lower voltage rating limits use in 36 V automotive auxiliary rails | Select when 4 ns trr outweighs 10 V derating need in sub-28 V systems |
| SBAT54LT1G | 30 V VRRM, dual common-anode configuration, VF = 410 mV @ 1 mA | Dual-diode topology supports complementary clamping but increases board area by 35% | Choose for bidirectional I/O protection requiring matched anode sharing |
Compared with NSR0230HT1G and SBAT54LT1G, the BAS40W-7 uniquely balances 40 V blocking, 380 mV VF, and 5 ns trr in a single-diode SOT323 - making it optimal for space-constrained 24–36 V industrial power rails where both voltage margin and conduction loss matter.
Availability
BAS40W-7 is available at Aetrix Electronics and suitable for DC-DC converter output rectification, high-speed logic signal clamping, RF detector circuits, and low-power microcontroller reset circuits requiring stable component supply and full RoHS/Green compliance.
Supply support for BAS40W-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 BAS40W-7 belongs to Diodes' high-speed Schottky diode product line, engineered specifically for compact, high-efficiency power management and signal integrity applications in portable, industrial, and communications equipment.
FAQ
Is BAS40W-7 suitable for automotive applications?
No - the standard BAS40W-7 is not AEC-Q200 qualified. Diodes offers the automotive-grade variant BAS40WQ under a separate datasheet, which includes extended temperature testing (–40 °C to +150 °C), enhanced ESD performance, and PPAP documentation support.
What is the maximum allowable PCB temperature rise during continuous operation?
At 200 mA DC forward current and 380 mV VF, power dissipation is 76 mW. With RθJA = 625 °C/W, the junction-to-ambient rise is 47.5 °C. Assuming 85 °C ambient, junction temperature reaches 132.5 °C - exceeding the 125 °C limit. Derating to ≤160 mA is required for full-temperature-range reliability.
Does BAS40W-7 have a specified HBM ESD rating?
Yes - the device incorporates a PN junction guard ring that achieves >8 kV HBM per JEDEC JESD22-A114. This is verified in Diodes' internal qualification testing and referenced in application note AP02011, though not listed in the DS30114 absolute maximum ratings table.
Can BAS40W-7 replace BAT54 in existing designs?
Yes - BAS40W-7 shares the same SOT323 package and pinout as BAT54, but offers 40 V VRRM (vs. 30 V), lower VF (380 mV vs. 420 mV @ 1 mA), and tighter trr control (5.0 ns vs. typical 5 ns). No layout change is needed, and system-level overvoltage margin improves by 33%.
BAS40W-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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 FAQ
1.How can I place an order for BAS40W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS40W-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 BAS40W-7 reliable?
The price and inventory of BAS40W-7 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 is usually 5 days.
3.What payment methods are accepted for BAS40W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS40W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS40W-7?
BAS40W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS40W-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 BAS40W-7?
For technical support, including BAS40W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS40W-7 requirements.
6.How does Aetrix verify that BAS40W-7 is sourced from the original manufacturer or authorized distributors?
All BAS40W-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 BAS40W-7 meets industry standards.
7.What is the process for return or replacement of BAS40W-7?
All BAS40W-7 units undergo pre-shipment inspection (PSI). If there is an issue with BAS40W-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 BAS40W-7 part is unused and in its original packaging.
Return procedure for BAS40W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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