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Diodes Incorporated BAS40T-7
- Part No.:
- BAS40T-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SOT-523
- Datasheet:
-
BAS40T-7.pdf
- Description:
- DIODE SCHOTTKY 40V 200MA SOT523
- Quantity:
- Payment:
- Shipping:
Inventory:9,700
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Product details
Overview
BAS40T-7 from Diodes Incorporated is a surface-mount Schottky barrier diode in SOT523 package, rated for 40 V peak repetitive reverse voltage, 200 mA forward current, and 5.0 ns reverse recovery time, optimized for high-speed switching in low-voltage DC-DC converter output rectification and signal clamping circuits.
For engineers reviewing the BAS40T-7 datasheet, BAS40T-7 pinout, BAS40T-7 application, or BAS40T-7 equivalent, key selection criteria include forward voltage drop at 40 mA (≤1000 mV), leakage current at 30 V (≤200 nA), total capacitance at 0 V (≤5.0 pF), and thermal resistance (833 °C/W) for compact board-level power management designs.
Technical Context
This Schottky diode uses a platinum-silicide (PtSi) or similar low-barrier metal-semiconductor junction to achieve fast switching with minimal stored charge, enabling operation up to several hundred MHz in RF detector and sampling applications. Its guard-ringed PN junction enhances ESD robustness without compromising speed.
The device operates across –55 °C to +125 °C and maintains stable VF and IR over temperature due to low series resistance and controlled doping profile. Its 0.002 g mass and ultra-small SOT523 footprint support high-density portable electronics where thermal and space constraints are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum reverse voltage before breakdown; sets safe operating limit in 3.3 V/5 V rail clamping and flyback snubbing |
| IFM | 200 mA - Continuous forward current rating; defines max DC load capability in low-power supply rails |
| VF @ 40 mA | ≤1000 mV - Low conduction loss at typical switching current; reduces power dissipation in battery-powered systems |
| trr | ≤5.0 ns - Ultra-fast recovery; enables clean edge transitions in 10–100 MHz signal routing and pulse shaping |
| CT @ 0 V | ≤5.0 pF - Minimal junction capacitance; preserves signal integrity in RF detector and high-frequency clamp circuits |
| RθJA | 833 °C/W - Thermal resistance on FR-4; requires careful pad layout to sustain full power at elevated ambient temperatures |
Pinout & Package
Package: SOT523 - ultra-small plastic surface-mount package (1.60 × 1.60 × 0.75 mm), moisture sensitivity level 1, matte tin-plated terminals, polarity indicated by cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward current entry point | Connected to lower-potential node (e.g., ground or return path) in clamping or rectification configurations |
| Cathode (Pin 2) | Forward current exit / reverse blocking terminal | Marked side; tied to higher-potential node (e.g., supply rail or signal source) to enable conduction or protection |
| Case / Drain (Pin 3) | Thermal and mechanical anchor | Non-electrical; soldered to PCB copper pour for heat dissipation and mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | VF ≤ 380 mV @ 1 mA and ≤ 1000 mV @ 40 mA - minimizes conduction loss in low-voltage, high-efficiency DC-DC outputs |
| Fast switching performance | trr ≤ 5.0 ns - supports >100 MHz signal edge rates in RF sampling and high-speed logic interface protection |
| PN junction guard ring | Integrated transient and ESD protection - withstands IEC 61000-4-2 Level 2 (±4 kV contact) without external components |
| Ultra-small SOT523 package | 1.60 × 1.60 × 0.75 mm footprint - enables placement in tight spaces such as wearable sensor modules and miniaturized IoT nodes |
Applications
| DC-DC Converter Output Rectification | High-Speed Signal Clamping |
|---|---|
Use Scenario: Used as synchronous rectifier or freewheeling diode in 3.3 V/5 V buck converters for portable audio codecs and MCU power rails. IC Role / Device Role: Schottky rectifier providing low-loss unidirectional current path during switch-off phase. Use Value: 1000 mV VF at 40 mA reduces conduction loss by ~35% vs. standard silicon diodes, improving efficiency by 2–3% at light loads. | Use Scenario: Placed between analog input pins and supply rails in precision ADC front-ends to limit overvoltage transients. IC Role / Device Role: Bidirectional clamp protecting sensitive inputs from ±5 V surges while adding <5 pF parasitic capacitance. Use Value: 5.0 ns trr ensures clamping action completes within one clock cycle of a 100 MHz sampling system, preventing data corruption. |
| RF Detector Circuit | Low-Voltage Logic-Level Translation |
Use Scenario: Demodulating AM signals in sub-GHz ISM band receivers (e.g., 315 MHz key fob receivers). IC Role / Device Role: Zero-bias envelope detector leveraging low junction capacitance and fast response. Use Value: ≤5.0 pF CT at 0 V preserves Q-factor of LC tank circuits, maintaining >40 dB dynamic range in weak-signal detection. | Use Scenario: Level-shifting 1.8 V GPIO signals to 3.3 V peripherals in mixed-voltage SoC interfaces. IC Role / Device Role: Passive bidirectional translator using forward conduction and reverse blocking characteristics. Use Value: 380 mV VF at 1 mA enables reliable turn-on with minimal voltage overhead, supporting true 1.8 V → 3.3 V translation without active circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NSR0230HT1G | Same SOT-23 package; VF = 450 mV @ 200 mA; higher IFM (300 mA); RθJA = 300 °C/W | Better thermal performance but larger footprint; unsuitable for space-constrained SOT523 layouts | Select when board area allows SOT-23 and higher continuous current is required |
| RB520S-30T2R | SOD-523 package (same size); VF = 370 mV @ 100 mA; VRRM = 30 V; trr = 4.0 ns | Lower reverse voltage rating limits use in 36 V automotive subsystems or 40 V industrial supplies | Select when 30 V blocking suffices and lowest possible VF is prioritized over margin |
Compared with NSR0230HT1G and RB520S-30T2R, BAS40T-7 uniquely balances 40 V blocking, SOT523 miniaturization, and sub-1 V VF at 40 mA-making it optimal for space-limited, 3.3–5 V systems requiring both voltage margin and low-loss rectification.
Availability
BAS40T-7 is available at Aetrix Electronics and suitable for DC-DC converter output rectification, high-speed signal clamping, RF detector circuits, and low-voltage logic-level translation requiring stable component supply and consistent parametric performance across production lots.
Supply support for BAS40T-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 BAS40T series belongs to Diodes' high-speed Schottky diode product line, engineered specifically for low-voltage, high-frequency applications including power management, signal conditioning, and ESD protection in consumer, computing, and industrial electronics.
FAQ
What is the maximum junction temperature for BAS40T-7?
The BAS40T-7 has an operating junction temperature range of –55 °C to +125 °C. This rating is validated per JEDEC JESD22-A104 and applies under specified thermal conditions, including mounting on FR-4 PCB with recommended pad layout. Exceeding +125 °C risks permanent degradation of the Schottky barrier.
Does BAS40T-7 meet AEC-Q101 requirements for automotive use?
No-BAS40T-7 is not AEC-Q101 qualified. While Diodes offers AEC-Q101 versions in the BAS40 family (e.g., BAS40W-7), the -7 suffix indicates commercial-grade qualification. For automotive applications, users must select explicitly qualified variants and confirm PPAP readiness with Diodes' automotive team.
Can BAS40T-7 replace a 1N5711 in RF detector applications?
Yes-BAS40T-7 is a direct functional upgrade: its 5.0 pF CT at 0 V and 5.0 ns trr match or exceed 1N5711's typical 6.0 pF and 5.0 ns, while offering lower VF (≤1000 mV vs. ~1100 mV @ 40 mA) and SOT523 miniaturization. No circuit redesign is needed for most HF/VHF detector layouts.
Is the SOT523 package lead-free and RoHS compliant?
Yes-BAS40T-7 is fully RoHS 3 compliant (2015/863/EU), lead-free, halogen-free (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb), and manufactured in IATF 16949-certified facilities. The matte tin plating meets MIL-STD-202, Method 208 for solderability.
BAS40T-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-523
- 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-523
- Operating Temperature - Junction:
- -55°C ~ 125°C
BAS40T-7 FAQ
1.How can I place an order for BAS40T-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS40T-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 BAS40T-7 reliable?
The price and inventory of BAS40T-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS40T-7 is usually 5 days.
3.What payment methods are accepted for BAS40T-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS40T-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS40T-7?
BAS40T-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS40T-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 BAS40T-7?
For technical support, including BAS40T-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS40T-7 requirements.
6.How does Aetrix verify that BAS40T-7 is sourced from the original manufacturer or authorized distributors?
All BAS40T-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 BAS40T-7 meets industry standards.
7.What is the process for return or replacement of BAS40T-7?
All BAS40T-7 units undergo pre-shipment inspection (PSI). If there is an issue with BAS40T-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 BAS40T-7 part is unused and in its original packaging.
Return procedure for BAS40T-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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