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Diodes Incorporated B140WS-7
- Part No.:
- B140WS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
B140WS-7.pdf
- Description:
- DIODE SCHOTTKY 40V 1A SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:20,474
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Product details
Overview
B140WS-7 from Diodes Incorporated is a surface-mount Schottky barrier rectifier in SOD323 package, rated for 40 V peak repetitive reverse voltage and 1 A average rectified output current, with typical forward voltage of 0.54 V at 1 A, used in low-voltage DC/DC converter outputs and USB power rail protection.
For engineers reviewing the B140WS-7 datasheet, B140WS-7 pinout, B140WS-7 application, or B140WS-7 equivalent, key selection criteria include its low VF (0.54 V typ), 350 °C/W RθJA on FR-4, 125 pF junction capacitance at 0 V, guard ring construction for transient immunity, and automotive-grade variant availability (B140WSQ).
Technical Context
This Schottky diode operates as a unidirectional power rectifier with metal–semiconductor junction enabling fast switching and minimal forward conduction loss. Its guard ring structure enhances ruggedness against voltage transients, and the SOD323 footprint supports high-density PCB layouts in space-constrained portable electronics.
Thermal performance depends on PCB pad layout: RθJA is 350 °C/W on standard FR-4 (per recommended pad) but improves to 270 °C/W on 1-inch² 2-oz copper. Reverse leakage remains ≤50 µA at 40 V, supporting stable operation in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum non-repetitive reverse voltage before breakdown; sets upper limit for input surge tolerance in 5 V–12 V supply rails. |
| IO | 1 A - Continuous DC output current capability; sufficient for USB 2.0/3.0 port power delivery and small-signal DC/DC post-regulation. |
| VF @ 1 A | 0.54 V (typ) - Low forward drop reduces conduction loss and self-heating; enables >92% efficiency in 3.3 V buck converter outputs. |
| IR @ 40 V | 2.0 µA (typ), 50 µA (max) - Low leakage preserves battery standby time in always-on IoT sensor nodes. |
| CT @ 0 V | 125 pF - Junction capacitance impacts high-frequency switching noise; suitable for <1 MHz SMPS designs without EMI filtering penalty. |
| RθJA (FR-4) | 350 °C/W - Thermal resistance defines max power dissipation (460 mW) on standard PCB; requires thermal relief design for sustained 1 A loads. |
Pinout & Package
Package: SOD323 - ultra-small plastic surface-mount package (1.30 mm × 1.70 mm × 0.90 mm), cathode-indicated by band, matte tin-plated leads, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., switch node of buck converter); polarity must match layout to avoid reverse bias failure. |
| Cathode | Current exit terminal during forward conduction; marked with band | Connected to output rail or ground return path; band orientation must align with silkscreen to prevent assembly error. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | 0.54 V typ at 1 A - directly reduces I²R losses and thermal stress in compact power stages. |
| Guard ring construction | Integrated edge termination - improves surge immunity (IFSM = 3 A) and prevents premature avalanche failure under load dump or ESD events. |
| SOD323 footprint | 1.30 mm × 1.70 mm body - enables placement in tight spaces such as wearable device PMIC modules and USB-C port protection circuits. |
| Halogen- and antimony-free "Green" material | <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - meets IPC-1752A environmental compliance for export to EU, Japan, and Korea markets. |
Applications
| USB Power Delivery Protection | Low-Voltage DC/DC Output Rectification |
|---|---|
Use Scenario: Protecting downstream USB peripherals from reverse current flow and input overvoltage transients in host-side power switches. IC Role / Device Role / Timing Role: Unidirectional blocking diode placed between VBUS and load; provides reverse polarity and backfeed prevention. Use Value: 0.54 V VF minimizes voltage drop across VBUS line, preserving 5 V regulation margin; guard ring withstands ±1 kV ESD per IEC 61000-4-2. | Use Scenario: Output rectification in 3.3 V synchronous buck converters where low conduction loss is critical for efficiency. IC Role / Device Role / Timing Role: Freewheeling path for inductor current during high-side FET off-time; operates at switching frequencies up to 1 MHz. Use Value: 125 pF CT limits displacement current noise; 1 A IO rating supports continuous 800 mA load with 20% derating margin. |
| Portable Battery Charging Circuits | Automotive Body Control Module (BCM) Inputs |
Use Scenario: OR-ing diode in dual-input (USB + battery) charging paths for Bluetooth earbuds and smartwatches. IC Role / Device Role / Timing Role: Prevents battery discharge into USB port when external power is removed; conducts only when VUSB > VBATT. Use Value: 2.0 µA typ IR at 40 V ensures negligible quiescent drain on Li-ion cells during multi-week storage. | Use Scenario: Input protection for 12 V microcontroller I/O lines exposed to load-dump transients in vehicle door modules. IC Role / Device Role / Timing Role: Clamp diode shunting transient energy to ground; leverages guard ring for robustness beyond ISO 7637-2 Pulse 5a. Use Value: 3 A IFSM rating handles 50 ms load-dump surges; SOD323 allows placement near connector for shortest transient path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSS1C200LT1G | Same SOD323 package, 20 V VRRM, 1 A IO, VF = 0.39 V @ 1 A - lower voltage rating but lower forward drop. | Restricted to ≤20 V systems (e.g., single-cell Li-ion chargers); unsuitable for 5 V bus protection requiring 40 V standoff. | Select when system max reverse voltage ≤20 V and lowest possible VF is prioritized over surge margin. |
| Vishay VS-1EQH04HM3/85A | SOD-123 package (larger), 40 V VRRM, 1 A IO, VF = 0.52 V @ 1 A, RθJA = 200 °C/W on copper pad - better thermal performance but 30% larger footprint. | Preferred for higher ambient temperature environments (>85 °C) where thermal headroom is critical; incompatible with SOD323 land pattern. | Select when board space permits larger package and thermal resistance below 270 °C/W is required for sustained 1 A operation. |
Compared with NSS1C200LT1G and VS-1EQH04HM3/85A, B140WS-7 uniquely balances 40 V standoff, SOD323 miniaturization, and 0.54 V VF-making it optimal for space-limited 5 V–12 V power routing where both surge margin and efficiency matter.
Availability
B140WS-7 is available at Aetrix Electronics and suitable for USB power delivery protection, low-voltage DC/DC output rectification, and portable battery charging circuits requiring stable component supply and full RoHS/Green compliance.
Supply support for B140WS-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, specializing in high-efficiency power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The B140WS belongs to Diodes' Schottky rectifier product line, engineered for low-loss, high-reliability power routing in compact, thermally constrained applications including portable electronics and automotive body electronics.
FAQ
What is the maximum allowable junction temperature for B140WS-7?
The B140WS-7 has an operating junction temperature range of –55 °C to +150 °C. Its absolute maximum TJ is 150 °C; exceeding this risks permanent degradation of the Schottky junction. Derating is required above 75 °C ambient when dissipating >200 mW, based on RθJA = 350 °C/W on FR-4.
Is B140WS-7 suitable for automotive applications?
The B140WS-7 is not AEC-Q200 qualified. However, Diodes offers the automotive-compliant B140WSQ variant (same electrical specs, qualified to AEC-Q200 Grade 2, –40 °C to +105 °C TJ), documented in a separate datasheet. Use B140WSQ for under-hood or BCM applications.
How does the guard ring construction improve reliability?
The guard ring in B140WS-7 is a diffused semiconductor region surrounding the active junction that controls electric field distribution at the chip edge. It prevents premature edge breakdown during voltage transients, raising the effective IFSM rating to 3 A and improving robustness against ESD and load-dump events without increasing VF or leakage.
Can B140WS-7 replace a standard silicon PN rectifier in a 5 V supply?
Yes-B140WS-7 can replace a 1N4148 or 1N4001 in low-current 5 V applications, delivering lower VF (0.54 V vs. ~0.7–1.1 V), faster recovery (<10 ns vs. µs), and reduced switching loss. However, its 40 V VRRM limits use to ≤40 V reverse conditions; verify system transient margins before substitution.
B140WS-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 620 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 50 µA @ 40 V
- Capacitance @ Vr, F:
- 125pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
- Operating Temperature - Junction:
- -40°C ~ 125°C
B140WS-7 FAQ
1.How can I place an order for B140WS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for B140WS-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 B140WS-7 reliable?
The price and inventory of B140WS-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B140WS-7 is usually 5 days.
3.What payment methods are accepted for B140WS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B140WS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B140WS-7?
B140WS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B140WS-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 B140WS-7?
For technical support, including B140WS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B140WS-7 requirements.
6.How does Aetrix verify that B140WS-7 is sourced from the original manufacturer or authorized distributors?
All B140WS-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 B140WS-7 meets industry standards.
7.What is the process for return or replacement of B140WS-7?
All B140WS-7 units undergo pre-shipment inspection (PSI). If there is an issue with B140WS-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 B140WS-7 part is unused and in its original packaging.
Return procedure for B140WS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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