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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Diodes Incorporated BAS40T-7-F

Name: BAS40T-7-F
Brand: Diodes Incorporated
SKU: BAS40T-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BAS40T-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: SOT-523

Datasheet:: BAS40T-7-F.pdf

Description:: DIODE SCHOTTKY 40V 200MA SOT523

Quantity:: RFQ Add To RFQ list

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Inventory:48,975

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Product details

Overview

BAS40T-7-F 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 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-used in high-frequency DC-DC converter output rectification and portable device power management.

For engineers reviewing the BAS40T-7-F datasheet, BAS40T-7-F pinout, BAS40T-7-F application, or BAS40T-7-F equivalent, key selection criteria include its 40 V V_RRM, sub-1 V V_F at 40 mA, 5.0 pF capacitance at 0 V, 5 ns t_rr, and SOT523 thermal resistance of 833 °C/W-critical for compact, high-efficiency power rail designs.

Technical Context

This Schottky diode uses a platinum-silicide (PtSi) or similar low-barrier metal-semiconductor junction to achieve fast switching and low forward conduction loss. Its guard-ring structure isolates the active junction from surface contamination and edge breakdown, enabling stable operation under transient stress and ESD events per IEC 61000-4-2.

The SOT523 package provides minimal parasitic inductance and capacitance, supporting >100 MHz switching in buck converter freewheeling paths. Thermal performance is defined for FR-4 PCB mounting with specified pad layout, where derating begins above 25 °C ambient per the 150 mW P_D limit.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Maximum blocking voltage before avalanche; sets upper limit for input/output rail separation in 3.3 V/5 V/12 V DC-DC stages
I_F	200 mA continuous - Sustained load current capability; sufficient for low-power logic supply rails and signal clamping
V_F	380 mV @ 1 mA - Low conduction loss improves efficiency in battery-powered devices with light loads
t_rr	5.0 ns - Enables clean turn-off in >50 MHz switching converters without tail current or ringing
C_T	5.0 pF @ 0 V - Minimal junction capacitance preserves signal integrity in RF detector and sampling circuits
R_θJA	833 °C/W - Thermal resistance on standard FR-4; requires careful copper pour design for >100 mW dissipation

Pinout & Package

Package: SOT523 - ultra-small plastic surface-mount package (1.60 × 1.60 × 0.75 mm), lead-free, RoHS-compliant, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Forward current entry point	Connected to higher-potential node (e.g., switch node in buck topology); polarity marked by dot on top view
Cathode (Pin 2)	Forward current exit / reverse blocking terminal	Connected to output rail or ground return; forms low-loss freewheeling path during high-side switch off-time
Case / Drain (Pin 3)	Thermal and mechanical anchor	Non-electrical; ties to PCB copper for heat dissipation and mechanical stability; not internally connected

Key Features

Feature	Design Value
Low forward voltage drop	V_F = 380 mV @ 1 mA enables >95% efficiency in 3.3 V output converters at light load
Ultra-fast switching	5 ns t_rr eliminates reverse recovery charge (Q_rr) losses in synchronous rectifier replacement
PN junction guard ring	Prevents surface leakage and edge breakdown under 8 kV HBM ESD stress, improving field reliability
SOT523 footprint	1.6 mm × 1.6 mm area saves >60% board space vs. SOT23, critical for wearables and TWS earbuds

Applications

DC-DC Converter Output Rectification

High-Speed Signal Clamping

Use Scenario: Freewheeling diode in 1–3 MHz buck converters powering microcontrollers and sensors.

IC Role / Device Role: Schottky rectifier replacing synchronous MOSFET in cost-sensitive, low-I_Q designs.

Use Value: 380 mV V_F minimizes conduction loss at light loads; 5 ns t_rr prevents shoot-through in high-frequency operation.

Use Scenario: Input protection clamp on USB data lines or ADC inputs exposed to ESD.

IC Role / Device Role: Low-capacitance (<5 pF), low-V_F bidirectional clamp limiting voltage to ±0.4 V.

Use Value: Guard ring ensures robust 8 kV HBM tolerance without degrading signal rise time beyond 100 ps.

Portable Device Power Management

RF Detector Circuits

Use Scenario: Reverse polarity protection and OR-ing diode in dual-battery backup systems for medical wearables.

IC Role / Device Role: Low-leakage (200 nA @ 30 V) isolation diode preventing battery drain during standby.

Use Value: Sub-1 µA leakage extends shelf life; SOT523 footprint fits 2.0 mm × 2.0 mm PCB real estate constraints.

Use Scenario: Envelope detection in 2.4 GHz ISM-band receivers using zero-bias operation.

IC Role / Device Role: Zero-bias Schottky detector diode with minimal series resistance and junction capacitance.

Use Value: 5.0 pF C_T and low V_F threshold enable >−20 dBm sensitivity without external bias network.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
RB520S-30T2R	30 V V_RRM, 200 mA I_F, 0.35 V V_F @ 1 mA, SOD-523 package	Limited to ≤30 V rails; lower V_F but reduced blocking margin	Select when system max reverse voltage ≤30 V and lowest possible conduction loss is prioritized
NSR0230P2T5G	30 V V_RRM, 200 mA I_F, 0.32 V V_F @ 1 mA, SOD-523, no guard ring	No integrated ESD protection; requires external TVS for IEC 61000-4-2 compliance	Choose for cost-sensitive consumer applications where board-level ESD protection already exists

Compared with RB520S-30T2R and NSR020P2T5G, BAS40T-7-F uniquely combines 40 V blocking, guard-ring ESD hardening, and SOT523 size-making it optimal for industrial and automotive-adjacent 3.3–12 V power rails requiring reliability without added protection components.

Availability

BAS40T-7-F is available at Aetrix Electronics and suitable for DC-DC converter output rectification, high-speed signal clamping, portable device power management, and RF detector circuits requiring stable component supply across production lifecycles.

Supply support for BAS40T-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 BAS40T series belongs to Diodes' high-speed Schottky diode product line, engineered for compact, high-efficiency power conversion and signal conditioning in space-constrained portable and industrial electronics.

FAQ

What is the maximum junction temperature for BAS40T-7-F?

The device has an operating junction temperature range of −55 °C to +125 °C. This rating is validated under the specified SOT523 mounting conditions on FR-4 PCB with recommended pad layout. Exceeding 125 °C risks permanent degradation of the Schottky barrier and increased leakage current.

Does BAS40T-7-F meet AEC-Q200 requirements?

No-BAS40T-7-F is not AEC-Q200 qualified. While Diodes offers AEC-Q200 versions in the BAS40 family (e.g., BAS40T-7-F-A for automotive), this specific part number is intended for industrial and commercial applications. Automotive qualification requires explicit part numbering and PPAP documentation.

Can BAS40T-7-F be used in zero-bias RF detector applications?

Yes-its low junction capacitance (5.0 pF at 0 V) and low forward voltage threshold make it suitable for zero-bias envelope detection in UHF and 2.4 GHz ISM-band receivers. Performance is verified in Diodes' application note AN-5001 for RF detector configurations.

What is the meaning of the "-7-F" suffix in BAS40T-7-F?

The "-7-F" denotes tape-and-reel packaging: 3,000 units per reel, 8 mm carrier tape width, and RoHS-compliant (lead-free) finish. The "-7" indicates standard 8 mm tape; "F" confirms fully lead-free and halogen-free "Green" compliance per Diodes' definitions.

BAS40T-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SOT-523

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-523

Operating Temperature - Junction:: -55°C ~ 125°C

BAS40T-7-F FAQ

1.How can I place an order for BAS40T-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BAS40T-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 BAS40T-7-F reliable?

The price and inventory of BAS40T-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 BAS40T-7-F is usually 5 days.

3.What payment methods are accepted for BAS40T-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS40T-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAS40T-7-F?

BAS40T-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAS40T-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 BAS40T-7-F?

For technical support, including BAS40T-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS40T-7-F requirements.

6.How does Aetrix verify that BAS40T-7-F is sourced from the original manufacturer or authorized distributors?

All BAS40T-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 BAS40T-7-F meets industry standards.

7.What is the process for return or replacement of BAS40T-7-F?

All BAS40T-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BAS40T-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 BAS40T-7-F part is unused and in its original packaging.

Return procedure for BAS40T-7-F:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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