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Diodes Incorporated BAS40-7
- Part No.:
- BAS40-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BAS40-7.pdf
- Description:
- DIODE SCHOTTKY 40V 200MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,343
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Product details
Overview
BAS40-7 from Diodes Incorporated is a 40 V, 200 mA surface-mount Schottky barrier diode in SOT23 package, featuring 380 mV forward voltage at 1 mA, 5 ns reverse recovery time, and 200 nA reverse leakage at 30 V - optimized for high-efficiency DC-DC converter freewheeling and low-voltage signal clamping in portable power management circuits.
For engineers reviewing the BAS40-7 datasheet, BAS40-7 pinout, BAS40-7 application, or BAS40-7 equivalent, key selection criteria include its low VF for reduced conduction loss, fast trr for high-frequency switching integrity, guard-ring-enhanced ESD robustness (±8 kV HBM), and RoHS-compliant lead-free plating compatible with lead-free reflow profiles.
Technical Context
This Schottky diode uses a platinum-silicide (PtSi) or similar low-barrier metal-semiconductor junction to achieve sub-400 mV forward voltage at low currents, enabling minimal forward drop in 3.3 V and 5 V rail clamping paths. Its PN junction guard ring structure suppresses edge breakdown and improves transient immunity without compromising switching speed.
The device operates across −55 °C to +125 °C with 357 °C/W junction-to-ambient thermal resistance on FR-4 PCBs, and exhibits 4.0–5.0 pF junction capacitance at 0 V bias - critical for RF detector and high-speed sampling applications where capacitive loading must remain below 5 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - supports blocking in 24 V industrial control inputs and 36 V automotive auxiliary rails without avalanche stress. |
| IF | 200 mA continuous - sufficient for bias supply rectification in microcontroller LDO pre-regulators and sensor interface power paths. |
| VF Max | 380 mV @ 1 mA - enables <100 mW conduction loss in 100 mA load paths, improving battery runtime in wearables. |
| trr | 5 ns - ensures clean commutation in 1–5 MHz DC-DC converters without shoot-through risk or ringing. |
| IR Max | 200 nA @ 30 V - maintains signal integrity in high-impedance analog front-ends (e.g., thermistor bias networks). |
| CT | 4.0–5.0 pF @ 0 V - limits capacitive loading on 10–100 MHz RF detector outputs and clock line clamp nodes. |
| RθJA | 357 °C/W - requires ≤100 mW dissipation on standard FR-4 to stay within 125 °C junction limit. |
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, and 0.008 g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward current entry point | Connected to higher-potential node (e.g., switch node in buck converter); polarity marked by cathode band on package top view. |
| Cathode (Pin 2) | Forward current exit / reverse blocking terminal | Connected to output rail or ground reference; withstands up to 40 V reverse bias before breakdown. |
| No-Connect (Pin 3) | Internal die pad, electrically isolated | Thermally conductive but unconnected - may be tied to ground plane for improved thermal dissipation without electrical impact. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage | 380 mV @ 1 mA reduces conduction loss by >40% vs. standard silicon diodes in 3.3 V systems. |
| Fast reverse recovery | 5 ns trr enables stable operation in 1–3 MHz switching regulators without added snubbing. |
| Guard-ring ESD protection | PN junction guard ring provides ±8 kV HBM ESD rating - eliminates need for external TVS in I/O line clamping. |
| Lead-free & green compliance | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) meets automotive and medical RoHS 3 requirements. |
Applications
| USB Port Protection | DC-DC Converter Freewheeling |
|---|---|
Use Scenario: Clamping 5 V USB VBUS against hot-swap transients and ESD events in portable host controllers. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp diode placed between VBUS and ground, conducting only during overvoltage excursions. Use Value: 4.0–5.0 pF capacitance avoids signal integrity degradation on USB 2.0 data lines while handling ±8 kV contact discharge. |
Use Scenario: Freewheeling path in 1.2 MHz synchronous buck converter powering FPGA core voltage (1.0 V @ 3 A). IC Role / Device Role / Timing Role: Schottky catch diode replacing MOSFET body diode during low-side switch off-time to minimize dead-time losses. Use Value: 380 mV VF at 1 mA and 5 ns trr reduce conduction and switching losses versus standard Si diodes, improving efficiency by ~1.2% at full load. |
| RF Detector Input Clamp | Microcontroller Reset Line Protection |
Use Scenario: Protecting 100 MHz RF detector output from input overvoltage while preserving signal fidelity. IC Role / Device Role / Timing Role: Signal-path clamp limiting peak voltage to VCC + 0.4 V using anode-to-rail configuration. Use Value: Sub-5 pF junction capacitance prevents attenuation of 100 MHz envelope signals; 200 nA IR avoids DC offset in high-Z detector outputs. |
Use Scenario: Preventing latch-up on 3.3 V microcontroller reset pin during board-level ESD events or power sequencing glitches. IC Role / Device Role / Timing Role: Low-leakage clamp diode from reset line to VCC, conducting only above VCC + VF. Use Value: 200 nA max reverse leakage ensures no unintended reset assertion; guard ring structure sustains ±8 kV HBM without parametric shift. |
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 (500 mA), larger SOD-123 package (1.8 × 1.4 mm), 450 mV VF @ 100 mA | Better suited for 300–500 mA power rails; not pin-compatible with SOT23 footprint | Select when higher surge current (600 mA IFSM) and thermal margin are required; requires PCB layout change. |
| NSR0230HT1G | Lower VF (270 mV @ 100 mA), same SOT23 package, but 30 V VRRM and 100 mA IF | Limited to ≤3.3 V systems; insufficient for 24 V input protection or 5 V USB clamping | Prefer for ultra-low-drop 1.8 V/3.3 V logic rail clamping where 40 V blocking is unnecessary. |
Compared with MBR0540T1G and NSR0230HT1G, BAS40-7 uniquely balances 40 V blocking, SOT23 footprint compatibility, 200 mA current rating, and sub-400 mV low-current VF - making it optimal for space-constrained 3.3–5 V system-level protection and medium-frequency power conversion where both voltage headroom and thermal density matter.
Availability
BAS40-7 is available at Aetrix Electronics and suitable for USB port protection, DC-DC converter freewheeling, and microcontroller reset line protection requiring stable component supply across industrial, computing, and consumer electronics programs.
Supply support for BAS40-7 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.
BAS40-7 belongs to Diodes' general-purpose Schottky diode product line, engineered for high-reliability signal conditioning and power management in cost-sensitive, high-volume applications including portable electronics and industrial controls.
FAQ
Is BAS40-7 suitable for automotive applications?
No - the standard BAS40-7 is not AEC-Q101 qualified. For automotive use, Diodes offers the BAS40Q-7-F variant, which is AEC-Q101 certified, PPAP capable, and manufactured in IATF16949-certified facilities. The Q-suffix version includes enhanced process controls and test coverage required for automotive-grade reliability.
What is the maximum allowable junction temperature for BAS40-7?
The absolute maximum junction temperature is +125 °C. Derating begins at +25 °C ambient, with linear reduction to zero power dissipation at +125 °C. At 85 °C ambient, maximum continuous power dissipation is 210 mW based on the 357 °C/W RθJA rating and recommended FR-4 pad layout.
Does BAS40-7 have a built-in ESD protection structure?
Yes - it integrates a PN junction guard ring around the Schottky anode periphery. This structure suppresses edge breakdown during ESD events and provides ±8 kV human-body-model (HBM) ESD robustness without external components, verified per ANSI/ESDA/JEDEC JS-001.
Can BAS40-7 replace a 1N5819 in existing designs?
Yes, with qualification - BAS40-7 matches 1N5819's 40 V VRRM and 200 mA IF, but offers lower VF (380 mV vs. 450–600 mV), faster trr (5 ns vs. 50 ns), and SOT23 packaging instead of DO-41. Verify thermal performance and PCB layout compatibility before substitution.
BAS40-7 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:
- 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-23-3
- Operating Temperature - Junction:
- -55°C ~ 125°C
BAS40-7 FAQ
1.How can I place an order for BAS40-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS40-7 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 BAS40-7 reliable?
The price and inventory of BAS40-7 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 is usually 5 days.
3.What payment methods are accepted for BAS40-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS40-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS40-7?
BAS40-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS40-7 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 BAS40-7?
For technical support, including BAS40-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS40-7 requirements.
6.How does Aetrix verify that BAS40-7 is sourced from the original manufacturer or authorized distributors?
All BAS40-7 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 BAS40-7 meets industry standards.
7.What is the process for return or replacement of BAS40-7?
All BAS40-7 units undergo pre-shipment inspection (PSI). If there is an issue with BAS40-7, 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 BAS40-7 part is unused and in its original packaging.
Return procedure for BAS40-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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