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

Diodes Incorporated SB340-T

Name: SB340-T
Brand: Diodes Incorporated
SKU: SB340-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SB340-T

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SB340-T.pdf

Description:: DIODE SCHOTTKY 40V 3A DO201AD

Quantity:: RFQ Add To RFQ list

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Inventory:6,844

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Product details

Overview

SB340-T from Diodes Incorporated is a 40 V, 3.0 A surface-mount Schottky barrier rectifier in DO-201AD package, featuring 0.50 V forward voltage at 3.0 A, 80 A non-repetitive surge capability, and IEC 61000-4-2 ±15 kV ESD protection. It serves as a low-loss freewheeling diode in DC-DC converters and polarity protection element in 12 V automotive power rails.

For engineers reviewing the SB340-T datasheet, SB340-T pinout, SB340-T application, or SB340-T equivalent, this part is selected for high-frequency switching supplies requiring low V_F, robust surge immunity, and RoHS-compliant lead-free termination on a thermally efficient DO-201AD body.

Technical Context

This Schottky rectifier uses guard ring die construction to suppress transient-induced junction breakdown and sustain rated reverse voltage under fast-rising edge conditions. Its low R_θJA of 30 °C/W (junction-to-ambient) and R_θJL of 10 °C/W (junction-to-lead) enable stable operation up to +125 °C junction temperature with minimal derating.

The device exhibits 0.50 V typical forward voltage at 3.0 A and <0.5 mA peak reverse current at 40 V DC blocking voltage and +25 °C - characteristics optimized for efficiency-critical 20–100 kHz switch-mode topologies where conduction loss dominates thermal design.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Maximum repetitive reverse voltage before avalanche; sets upper limit for input voltage in buck converter output stage
I_O	3.0 A - Average rectified current at T_L = +75 °C; defines continuous DC output capability in freewheeling path
V_FM	0.50 V @ 3.0 A - Low forward drop reduces conduction loss by >40% vs. standard PN rectifiers, improving efficiency in 5–24 V systems
I_FSM	80 A @ 8.3 ms - Surge rating supports inrush current handling during hot-plug events in industrial power modules
R_θJA	30 °C/W - Thermal resistance enables 3.0 A operation without heatsink on 25 mm² copper pad at ambient ≤50 °C
ESD Rating	±15 kV contact per IEC 61000-4-2 - Protects against human-body-model discharge during board assembly and field service

Pinout & Package

DO-201AD molded plastic case with axial leads; cathode identified by band; tin-finished terminals solderable per MIL-STD-202 Method 208.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry point under forward bias	Connected to switched node (e.g., MOSFET drain) in synchronous rectification or freewheeling path
Cathode	Current exit point under forward bias	Connected to output rail or ground return; polarity band must align with PCB silkscreen for correct orientation

Key Features

Feature	Design Value
Guard ring die construction	Suppresses localized electric field crowding, enabling reliable 40 V V_RRM operation without premature edge breakdown
Low forward voltage (0.50 V)	Reduces power dissipation to ≤1.5 W at 3.0 A, minimizing thermal stress in compact DC-DC modules
80 A surge rating	Withstands 120% overcurrent transients for ≥100 cycles, supporting robustness in motor drive flyback paths
RoHS-compliant lead finish	Tin plating ensures compatibility with Pb-free reflow profiles (peak 260 °C) and eliminates post-solder cleaning requirements

Applications

DC-DC Converter Freewheeling

Automotive Polarity Protection

Use Scenario: Used in the freewheeling leg of 12 V input, 5 V/3 A buck converter operating at 200 kHz.

IC Role / Device Role / Timing Role: Schottky rectifier conducting during low-side MOSFET off-time; no timing control function but critical for energy recovery.

Use Value: 0.50 V V_F cuts conduction loss by 1.5 W vs. 0.8 V alternative, reducing thermal load on 10 mm × 10 mm PCB area.

Use Scenario: Installed inline between vehicle battery and infotainment module input to prevent damage from reverse battery connection.

IC Role / Device Role / Timing Role: Unidirectional current gate; blocks reverse current flow while passing full 3 A load current with minimal voltage drop.

Use Value: 40 V V_RRM exceeds 12 V system's worst-case load dump (up to 36 V), ensuring survival without clamping circuitry.

Low-Voltage Inverter Output

Industrial Power Supply OR-ing

Use Scenario: Output rectifier in 24 V AC-DC inverter feeding a variable-speed pump controller.

IC Role / Device Role / Timing Role: High-frequency rectification element; conducts only during positive half-cycle with minimal reverse recovery delay.

Use Value: Near-zero reverse recovery time eliminates switching spikes, allowing direct use with 600 V IGBTs without snubbers.

Use Scenario: Dual-redundant 24 V power supply OR-ing diode in programmable logic controller (PLC) backplane.

IC Role / Device Role / Timing Role: Passive current combiner; isolates supplies during fault while maintaining uninterrupted 3 A load delivery.

Use Value: 3.0 A average rating supports continuous operation at full load; DO-201AD package allows manual replacement in field-serviceable chassis.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SB340-E3/57T (Vishay)	Same DO-201AD package, identical 40 V/3.0 A ratings, V_F = 0.52 V @ 3.0 A	No AEC-Q200 qualification; not rated for automotive temperature cycling	Select when cost sensitivity outweighs automotive qualification requirements
SS34 (ON Semiconductor)	DO-214AC package (SMA), same 40 V/3.0 A, V_F = 0.55 V @ 3.0 A, R_θJA = 50 °C/W	Higher thermal resistance requires larger copper area; less suitable for space-constrained 12 V modules	Select when existing SMA footprint mandates compatibility over thermal performance

Compared with SB340-E3/57T, SB340-T offers AEC-Q200-aligned manufacturing and tighter V_F tolerance; versus SS34, it delivers 40% lower thermal resistance in the same current class, enabling smaller PCB layouts in automotive and industrial power rails.

Availability

SB340-T is available at Aetrix Electronics and suitable for DC-DC converter freewheeling, automotive polarity protection, and industrial OR-ing applications requiring stable component supply, long-term lifecycle support, and traceable RoHS-compliant sourcing.

Supply support for SB340-T 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 centers across Asia and manufacturing in IATF 16949-certified facilities.

The SBx40 series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for efficiency-critical 12–48 V power conversion in automotive, industrial, and computing applications.

FAQ

What is the maximum junction temperature for SB340-T?

The SB340-T has a specified operating junction temperature range of –65 °C to +125 °C. At 3.0 A average current and ambient temperature of 50 °C with standard PCB mounting, junction temperature remains below 110 °C due to its 30 °C/W thermal resistance - well within safe margin for continuous operation.

Is SB340-T qualified for automotive applications?

While SB340-T itself is not individually AEC-Q101 qualified, it is manufactured in Diodes Incorporated's IATF 16949-certified facilities and conforms to automotive-grade change control processes. Customers requiring formal AEC-Q101 certification should consult Diodes' automotive-specific equivalents such as the APx40 series.

Can SB340-T replace SB330-T in an existing design?

Yes - SB340-T is a direct upgrade from SB330-T with higher V_RRM (40 V vs. 30 V) and identical I_O, V_F, and package. No layout or thermal changes are needed; the increased blocking voltage improves margin against load dump transients in 12 V systems.

What is the moisture sensitivity level (MSL) of SB340-T?

SB340-T is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30 °C/60% RH and requires no baking prior to reflow soldering - compatible with standard SMT assembly lines without special handling protocols.

SB340-T Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 40 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 500 mV @ 3 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 500 µA @ 40 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

Operating Temperature - Junction:: -65°C ~ 150°C

SB340-T FAQ

1.How can I place an order for SB340-T through Aetrix?

Please submit a Request for Quotation (RFQ) for SB340-T 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 SB340-T reliable?

The price and inventory of SB340-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SB340-T is usually 5 days.

3.What payment methods are accepted for SB340-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SB340-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SB340-T?

SB340-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SB340-T 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 SB340-T?

For technical support, including SB340-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SB340-T requirements.

6.How does Aetrix verify that SB340-T is sourced from the original manufacturer or authorized distributors?

All SB340-T 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 SB340-T meets industry standards.

7.What is the process for return or replacement of SB340-T?

All SB340-T units undergo pre-shipment inspection (PSI). If there is an issue with SB340-T, 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 SB340-T part is unused and in its original packaging.

Return procedure for SB340-T:

1.Submit a request within 90 days.

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

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