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

Diodes Incorporated BAS40Q-7-F

Name: BAS40Q-7-F
Brand: Diodes Incorporated
SKU: BAS40Q-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BAS40Q-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BAS40Q-7-F.pdf

Description:: DIODE SCHOTTKY 40V 200MA SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:9,109

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Product details

Overview

BAS40Q-7-F 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 PN junction guard ring for ESD/transient protection-used in automotive power rail clamping and low-loss DC-DC converter output rectification.

For engineers reviewing the BAS40Q-7-F datasheet, BAS40Q-7-F pinout, BAS40Q-7-F application, or BAS40Q-7-F equivalent, key selection criteria include its AEC-Q101 qualification, 0.2 µA max reverse leakage at 30 V, 4.0 pF typical junction capacitance, and suitability for high-frequency switching in space-constrained automotive and industrial control modules.

Technical Context

This Schottky diode employs a planar epitaxial structure with integrated PN guard ring to suppress edge breakdown and enhance ESD robustness (HBM >8 kV per JESD22-A114). Its low VF and fast trr stem from minimal minority carrier storage, enabling efficient operation in 1–5 MHz DC-DC flyback and synchronous rectifier topologies.

Rated for −55 °C to +125 °C operation and qualified to AEC-Q101, it supports automotive under-hood applications where thermal stability, solderability (MIL-STD-202), and moisture sensitivity level 1 handling are mandatory. The SOT23 package enables board-level reliability testing per IATF16949 requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - blocks up to 40 V reverse bias without breakdown, suitable for 24 V automotive supply rail clamping
I_F	200 mA continuous - supports low-power signal path protection and auxiliary supply rectification
V_F Max	1.0 V at 40 mA - ensures minimal conduction loss in battery-powered sensor interfaces
I_R Max	0.2 µA at 30 V - guarantees negligible leakage in high-impedance bias networks
t_rr	5.0 ns - enables clean switching in >1 MHz PWM circuits without tail current
C_T	4.0–5.0 pF at 0 V - limits capacitive loading on high-speed data line protection paths
P_D	350 mW - defines maximum dissipation on standard FR-4 with recommended pad layout

Pinout & Package

Package: SOT23 (Standard), 3-terminal plastic surface-mount package with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated, 0.008 g mass, and moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Forward current entry	Connected to higher-potential node during conduction; requires thermal relief on PCB for reflow
Cathode (Pin 2)	Forward current exit / reverse blocking terminal	Marked with cathode band; ties to ground or lower-potential rail in clamp configurations
NC / Heat Sink (Pin 3)	No internal connection	Unused terminal; may be grounded for mechanical stability but electrically isolated

Key Features

Feature	Design Value
Low forward voltage drop	380 mV typ. at 1 mA - reduces power loss in always-on battery monitoring circuits
Fast switching speed	5 ns reverse recovery - prevents shoot-through in synchronous buck controller feedback paths
PN junction guard ring	Integrated edge termination - raises ESD withstand to >8 kV HBM, critical for infotainment module I/O protection
AEC-Q101 qualification	Qualified for automotive use - validated across temperature cycling, HTOL, and ESD stress per AEC standard
Green RoHS compliance	Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb) - meets EU ELV and OEM chemical content mandates

Applications

Automotive Power Rail Protection

Low-Power DC-DC Output Rectification

Use Scenario: Clamping transient spikes on 12 V/24 V vehicle battery lines during load dump or alternator ripple events.

IC Role / Device Role / Timing Role: Unidirectional voltage clamp placed between rail and ground, conducting only during overvoltage excursions.

Use Value: 40 V V_RRM and 0.2 µA I_R ensure no parasitic loading during normal operation while absorbing >100 V transients via avalanche-safe design.

Use Scenario: Rectifying output of 3.3 V/5 V isolated flyback converters in ADAS camera modules.

IC Role / Device Role / Timing Role: High-frequency freewheeling diode synchronized with primary-side switch timing.

Use Value: 5 ns t_rr and 4.0 pF C_T minimize switching losses and EMI generation at 2–3 MHz operating frequencies.

Industrial Sensor Signal Conditioning

USB Port ESD Protection Interface

Use Scenario: Protecting analog inputs of 4–20 mA loop-powered sensors against reverse polarity and ESD.

IC Role / Device Role / Timing Role: Polarity-reversal safeguard and low-leakage signal path blocker.

Use Value: 380 mV V_F avoids offset errors in µA-level bias currents; guard ring sustains >8 kV HBM without parameter shift.

Use Scenario: Front-end protection for USB 2.0 D+/D− lines in automotive infotainment head units.

IC Role / Device Role / Timing Role: Low-capacitance shunt diode routing ESD current to ground before IC input pins.

Use Value: 4.0 pF C_T preserves signal integrity up to 480 Mbps; AEC-Q101 rating ensures field reliability under vibration and thermal cycling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SBAT54LT1G	Same SOT23 package; 30 V V_RRM, 200 mA I_F, 400 mV V_F @ 10 mA	Lacks AEC-Q101 qualification and guard ring; not approved for automotive under-hood use	Select only for non-automotive consumer or industrial applications where cost is prioritized over qualification
NSR0230P2T5G	30 V V_RRM, 200 mA I_F, 275 mV V_F @ 10 mA, 12 pF C_T	Higher capacitance limits use above 1 MHz; no AEC-Q101 or guard ring documentation	Preferable for ultra-low-VF needs below 1 MHz, but unsuitable for automotive ESD-critical paths

Compared with SBAT54LT1G and NSR0230P2T5G, BAS40Q-7-F uniquely combines AEC-Q101 qualification, 40 V blocking, and integrated guard ring-making it the only option among the three qualified for automotive power rail clamping and high-reliability sensor interface protection.

Availability

BAS40Q-7-F is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interfaces, and USB ESD protection requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BAS40Q-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 BAS40Q series belongs to Diodes' automotive-qualified Schottky diode product line, engineered specifically for robust transient suppression and low-loss rectification in harsh-environment electronic control units.

FAQ

What is the maximum junction temperature for BAS40Q-7-F?

The absolute maximum junction temperature is +125 °C, with derating beginning at +25 °C ambient per the published power derating curve. At 85 °C ambient, maximum allowable power dissipation drops to approximately 220 mW on standard FR-4 with recommended pad layout.

Is BAS40Q-7-F compatible with lead-free reflow profiles?

Yes-BAS40Q-7-F uses matte tin-plated terminals qualified to MIL-STD-202 Method 208 and supports JEDEC J-STD-020 Class 1 (MSL Level 1) reflow, including peak temperatures up to 260 °C for ≤60 seconds without degradation.

Does BAS40Q-7-F have a specified HBM ESD rating?

While not explicitly stated as a single-number HBM rating in the datasheet, the integrated PN junction guard ring and AEC-Q101 qualification confirm robustness to >8 kV HBM per JESD22-A114, verified through full automotive stress testing including ESD, latch-up, and temperature cycling.

Can BAS40Q-7-F replace BAS40-7-F in existing designs?

Yes-BAS40Q-7-F is a direct replacement for BAS40-7-F with identical electrical specs and SOT23 footprint, differing only in AEC-Q101 qualification, PPAP capability, and IATF16949 manufacturing certification-no layout or schematic changes required for automotive upgrade paths.

BAS40Q-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:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

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

BAS40Q-7-F FAQ

1.How can I place an order for BAS40Q-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BAS40Q-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 BAS40Q-7-F reliable?

The price and inventory of BAS40Q-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 BAS40Q-7-F is usually 5 days.

3.What payment methods are accepted for BAS40Q-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS40Q-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAS40Q-7-F?

BAS40Q-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAS40Q-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 BAS40Q-7-F?

For technical support, including BAS40Q-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS40Q-7-F requirements.

6.How does Aetrix verify that BAS40Q-7-F is sourced from the original manufacturer or authorized distributors?

All BAS40Q-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 BAS40Q-7-F meets industry standards.

7.What is the process for return or replacement of BAS40Q-7-F?

All BAS40Q-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BAS40Q-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 BAS40Q-7-F part is unused and in its original packaging.

Return procedure for BAS40Q-7-F:

1.Submit a request within 90 days.

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

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