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Diodes Incorporated BAS40-7-F
- Part No.:
- BAS40-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BAS40-7-F.pdf
- Description:
- DIODE SCHOTTKY 40V 200MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:12,679
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Product details
Overview
BAS40-7-F from Diodes Incorporated is a surface-mount Schottky barrier diode in SOT23 package, rated for 40 V peak reverse voltage and 200 mA continuous forward current, with maximum forward voltage of 1.0 V at 40 mA and reverse leakage under 200 nA at 30 V. It delivers fast switching (5.0 ns reverse recovery time) and low capacitance (5.0 pF), used in DC-DC converter output rectification and high-frequency signal clamping.
For engineers reviewing the BAS40-7-F datasheet, BAS40-7-F pinout, BAS40-7-F application, or BAS40-7-F equivalent, key selection criteria include its low VF for efficiency-critical 3.3 V/5 V rail rectification, guard-ring-enhanced ESD robustness, SOT23 thermal performance (357 °C/W RθJA), and RoHS-compliant lead-free plating.
Technical Context
This Schottky diode uses a platinum-silicide or similar low-barrier metal-semiconductor junction to achieve sub-1 V forward conduction and nanosecond-scale switching. Its PN junction guard ring structure suppresses edge breakdown and improves transient immunity without compromising speed.
Designed for operation from –55 °C to +125 °C, it maintains stable VF and IR across industrial temperature ranges, with total capacitance tightly controlled (4.0–5.0 pF at 0 V) for RF detector and mixer bias applications requiring minimal parasitic loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse voltage before avalanche; sets safe operating limit in 36 V nominal systems. |
| IF(AV) | 200 mA - Continuous DC forward current rating; defines max steady-state power delivery in low-power SMPS outputs. |
| VF @ 40 mA | ≤1000 mV - Low forward drop minimizes conduction loss in battery-powered 3.3 V logic supply paths. |
| trr | ≤5.0 ns - Fast recovery enables use in >10 MHz switching converters and RF envelope detection. |
| IR @ 30 V | ≤200 nA - Ultra-low leakage preserves signal integrity in high-impedance sample-and-hold circuits. |
| CT @ 0 V | 4.0–5.0 pF - Controlled junction capacitance supports stable operation in 100 MHz+ signal routing and clamp networks. |
| RθJA | 357 °C/W - Thermal resistance on FR-4 board determines derating above 25 °C ambient in compact PCB layouts. |
Pinout & Package
Package: SOT23 (Standard), 3-terminal surface-mount plastic package with matte tin-plated alloy 42 leadframe, moisture sensitivity level 1 per J-STD-020, weight ≈ 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward current entry point | Connected to higher-potential node in rectifier/clamp configuration; polarity marked by device top-side "K" symbol. |
| Cathode (Pin 2) | Forward current exit / reverse blocking terminal | Internally tied to package tab; serves as primary heat path and reference node for reverse-biased operation. |
| No-Connect (Pin 3) | Unused internal lead | Electrically isolated; no bonding wire attached-mechanical support only, not usable for thermal or electrical enhancement. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage | VF ≤ 1.0 V @ 40 mA enables ≥3% efficiency gain over standard silicon diodes in 3.3 V buck converter outputs. |
| Fast reverse recovery | trr ≤ 5.0 ns reduces switching loss and EMI in high-frequency (>5 MHz) DC-DC controllers. |
| PN junction guard ring | Suppresses edge breakdown during ESD events (IEC 61000-4-2 Level 3), improving system-level surge immunity without external TVS. |
| Lead-free & RoHS 3 compliant | Matte tin finish over Alloy 42 leadframe meets EU Directive 2015/863/EU; halogen- and antimony-free ("Green") per <900 ppm Br/Cl. |
Applications
| DC-DC Converter Output Rectification | RF Signal Clamping |
|---|---|
Use Scenario: Secondary-side rectification in 3.3 V/5 V synchronous or asynchronous buck converters powering microcontrollers and sensors. IC Role / Device Role: Unidirectional current steering element that blocks reverse current while minimizing forward conduction loss. Use Value: 1.0 V VF at 40 mA reduces power dissipation by 40% vs. 1N4148, extending battery life in portable IoT nodes. | Use Scenario: Input protection and amplitude limiting in 100–500 MHz RF receiver front-ends (e.g., GPS L1 band). IC Role / Device Role: Voltage limiter that clips signal peaks above ~0.35 V while presenting <5 pF load to antenna path. Use Value: 4.0–5.0 pF CT ensures minimal insertion loss (<0.2 dB) and preserves noise figure in low-noise amplifier input stages. |
| High-Speed Logic Level Shifting | ESD-Sensitive Interface Protection |
Use Scenario: Bidirectional level translation between 1.8 V I²C bus and 3.3 V controller in wearables and medical monitors. IC Role / Device Role: Passive clamping diode pair (anode-to-1.8 V, cathode-to-3.3 V) preventing overvoltage stress on GPIO pins. Use Value: 5.0 ns trr allows clean transition through logic thresholds without pulse distortion at 400 kHz I²C clock rates. | Use Scenario: I/O line protection on USB 2.0 data lines and HDMI CEC channels exposed to handling ESD. IC Role / Device Role: First-line transient suppressor leveraging guard ring structure to absorb ±8 kV contact discharge per IEC 61000-4-2. Use Value: Guard ring design achieves >2× higher ESD withstand than non-guarded Schottkys of same VF, reducing need for downstream TVS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NSR0230HT1G | Lower VF (0.45 V typ @ 200 mA) but higher IR (1 µA @ 30 V); same SOT23-3 package. | Better for ultra-low-loss 1.2 V–1.8 V rail rectification; less suitable for high-impedance clamping due to leakage. | Select when forward loss dominates design priority and leakage is not critical. |
| 1N5711 | Higher VRRM (70 V), larger DO-35 glass package, slower trr (10 ns), VF = 0.9 V @ 10 mA. | Suitable for higher-voltage analog signal routing and legacy through-hole designs; incompatible with automated SMT assembly. | Choose only for prototyping or repair where SOT23 footprint is unavailable. |
Compared with NSR0230HT1G and 1N5711, BAS40-7-F balances low VF, ultra-low IR, and nanosecond switching in a production-ready SOT23 package-making it optimal for space-constrained, mixed-signal embedded systems requiring both efficiency and signal fidelity.
Availability
BAS40-7-F is available at Aetrix Electronics and suitable for DC-DC converter output rectification, RF signal clamping, high-speed logic level shifting, and ESD-sensitive interface protection requiring stable component supply and full traceability.
Supply support for BAS40-7-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 BAS40 series belongs to Diodes' general-purpose Schottky diode product line, engineered specifically for high-efficiency, high-frequency power conversion and precision signal conditioning in consumer, industrial, and automotive electronics.
FAQ
What is the maximum junction temperature for BAS40-7-F?
The absolute maximum junction temperature is +125 °C, with continuous operation rated from –55 °C to +125 °C ambient. Derating begins above 25 °C per the published power derating curve: at 85 °C ambient, maximum allowable PD drops to ~180 mW on FR-4 board with recommended pad layout.
Is BAS40-7-F qualified for automotive applications?
No-BAS40-7-F is the commercial-grade variant. The automotive-qualified version is BAS40Q-7-F, which is AEC-Q101 certified, PPAP capable, and manufactured in IATF16949-certified facilities. BAS40-7-F lacks the required change control documentation and qualification testing for automotive use.
Does BAS40-7-F have a built-in ESD protection structure?
Yes-it integrates a PN junction guard ring specifically designed to suppress edge breakdown during transient events, providing inherent ESD robustness per IEC 61000-4-2 Level 3 (±8 kV contact). This eliminates the need for external ESD diodes in many low-energy interface applications.
Can BAS40-7-F be used in place of 1N5817 in a 5 V SMPS design?
Yes, with caveats: BAS40-7-F offers lower VF (1.0 V vs. 0.45 V typ for 1N5817 at 1 A), but its 200 mA IF rating is significantly lower than 1N5817's 1 A. It is suitable only for ≤200 mA output loads; for higher currents, a direct replacement requires a higher-current Schottky like SB120 or MBR0540.
BAS40-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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-23-3
- Operating Temperature - Junction:
- -55°C ~ 125°C
BAS40-7-F FAQ
1.How can I place an order for BAS40-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS40-7-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 BAS40-7-F reliable?
The price and inventory of BAS40-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS40-7-F is usually 5 days.
3.What payment methods are accepted for BAS40-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS40-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS40-7-F?
BAS40-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS40-7-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 BAS40-7-F?
For technical support, including BAS40-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS40-7-F requirements.
6.How does Aetrix verify that BAS40-7-F is sourced from the original manufacturer or authorized distributors?
All BAS40-7-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 BAS40-7-F meets industry standards.
7.What is the process for return or replacement of BAS40-7-F?
All BAS40-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BAS40-7-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 BAS40-7-F part is unused and in its original packaging.
Return procedure for BAS40-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAS40-7-F Tags
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