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Diodes Incorporated SB540-T
- Part No.:
- SB540-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SB540-T.pdf
- Description:
- DIODE SCHOTTKY 40V 5A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:1,411
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Product details
Overview
SB540-T from Diodes Incorporated is a 5.0A, 40V Schottky barrier rectifier in DO-201AD package, featuring low forward voltage drop (0.55V @ 5A), high surge capability (150A peak), and guard ring die construction for transient protection. It serves as a primary output rectifier in low-voltage DC/DC converters and polarity protection diode in automotive body control modules.
For engineers reviewing the SB540-T datasheet, SB540-T pinout, SB540-T application, or SB540-T equivalent, key selection criteria include its 40V VRRM rating, 0.55V forward voltage at rated current, thermal resistance of 8°C/W junction-to-lead, and DO-201AD mechanical compatibility with high-density PCB layouts.
Technical Context
This Schottky rectifier uses epitaxial construction to minimize reverse recovery time and switching losses, enabling efficient operation in high-frequency inverters and switch-mode power supplies up to several hundred kHz. Its guard ring die structure provides inherent transient voltage suppression without external components.
The device operates across -65°C to +150°C junction temperature range and maintains 0.5mA peak reverse current at 40V blocking voltage and 25°C ambient. Thermal performance is optimized for vertical PCB mounting with 9.5mm lead length, delivering 8°C/W junction-to-lead resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse voltage before breakdown; defines safe operating window in 36V automotive systems |
| IF(AV) | 5.0 A - Average forward current handling capacity; supports continuous 5A output in compact SMPS designs |
| VFM @ 5A | 0.55 V - Low conduction loss at full load; reduces power dissipation by ~2.75W vs. silicon diode alternatives |
| IFSM | 150 A - Non-repetitive surge rating; withstands inrush currents during hot-plug events in industrial power supplies |
| RθJL | 8 °C/W - Junction-to-lead thermal resistance; enables direct heat transfer to PCB copper pour for thermal management |
| TJ Range | -65 to +150 °C - Extended junction temperature capability; suitable for under-hood automotive environments |
Pinout & Package
DO-201AD molded plastic case with cathode band marking; 1.1g weight; UL 94V-0 flammability rating; bright tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to input/source side; requires adequate copper area for thermal dissipation |
| Cathode | Current exit point during forward conduction; marked with band | Connected to output/load side; polarity-sensitive placement prevents reverse bias failure |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Provides built-in transient protection without external TVS, reducing BOM count in 12V rail protection circuits |
| Low forward voltage (0.55V) | Minimizes conduction loss in high-current paths, improving efficiency in battery-powered portable equipment |
| 150A surge rating | Handles capacitor charging surges in DC input stages without derating or parallel devices |
| DO-201AD package | Standardized through-hole outline compatible with legacy assembly lines and automated optical inspection |
Applications
| Automotive Body Control Module | Industrial DC/DC Converter |
|---|---|
Use Scenario: Reverse polarity protection on 12V supply rail feeding microcontroller and CAN transceiver circuitry. IC Role / Device Role / Timing Role: Unidirectional current gate preventing damage from incorrect battery connection. Use Value: 0.55V forward drop limits voltage loss to <1.5% at 5A, preserving brown-out margin for sensitive logic. | Use Scenario: Output rectification in 48V-to-12V isolated flyback converter powering PLC I/O modules. IC Role / Device Role / Timing Role: High-frequency synchronous rectifier replacement with zero reverse recovery delay. Use Value: 150A surge rating absorbs transformer leakage energy during startup without snubber redesign. |
| Solar Charge Controller | LED Driver Power Stage |
Use Scenario: Blocking diode between PV array and battery bank to prevent nighttime discharge. IC Role / Device Role / Timing Role: Standby-state isolation element with minimal leakage (<0.5mA @ 40V). Use Value: -65°C to +150°C operating range ensures reliability in desert-mounted enclosures with no active cooling. | Use Scenario: Freewheeling path in buck-based constant-current LED driver for street lighting. IC Role / Device Role / Timing Role: Fast-switching path for inductor current continuity during MOSFET off-time. Use Value: Epitaxial construction eliminates reverse recovery tail, reducing EMI in 200kHz switching designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB540-E3/54 | Same electrical specs; DO-201AD package; lead-free matte tin finish per J-STD-006 | No tape-and-reel packaging; bulk or ammo only | Select for manual prototyping or low-volume hand-soldered assemblies |
| SS54 | 40V VRRM, 5A IF(AV), but 0.52V VFM @ 5A and higher IRM (1.0mA @ 25°C) | Higher leakage affects battery hold-up time in solar applications | Prefer where ultra-low forward drop outweighs leakage sensitivity |
Compared with SB540-E3/54 and SS54, SB540-T offers tape-and-reel delivery for SMT-compatible through-hole insertion, tighter IRM specification for long-term energy storage systems, and Diodes Incorporated's AEC-Q101 qualified manufacturing process for automotive-grade traceability.
Availability
SB540-T is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC/DC converters, solar charge controllers, and LED driver power stages requiring stable component supply and RoHS-compliant packaging.
Supply support for SB540-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 and manufacturing operations across Asia and the Americas.
The SBx40 series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for efficiency-critical 12–48V power conversion in automotive and industrial environments where thermal robustness and surge resilience are mandatory.
FAQ
What is the maximum junction temperature rating for SB540-T?
The SB540-T has a maximum junction temperature of +150°C, verified per DS23024 Rev. 9 specifications. This rating allows operation in under-hood automotive locations and sealed industrial enclosures without forced air cooling, provided thermal design meets RθJL = 8°C/W and PCB copper area complies with Diodes' layout guidelines.
Is SB540-T suitable for use in AEC-Q101 qualified automotive designs?
Yes - SB540-T is manufactured in IATF 16949 certified facilities and qualifies under AEC-Q101 for discrete semiconductors. Diodes Incorporated explicitly states that parts meeting AEC-Q101 requirements are available upon request, with PPAP documentation and change control processes aligned to automotive quality standards.
How does the guard ring die construction improve reliability?
The guard ring die construction in SB540-T enhances edge termination stability, suppressing avalanche breakdown at high dv/dt transients. This design feature reduces susceptibility to EOS damage during load dump events in 12V automotive systems and improves long-term reliability in industrial motor drive freewheeling applications without adding external clamping components.
What is the lead finish and solderability standard for SB540-T?
SB540-T features bright tin-plated leads compliant with MIL-STD-202, Method 208, ensuring reliable wetting and intermetallic formation during wave and reflow soldering. The finish meets RoHS 3 (2015/863/EU) requirements and is rated for moisture sensitivity level 1 per J-STD-020C, eliminating bake requirements prior to assembly.
SB540-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 5 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 ~ 125°C
SB540-T FAQ
1.How can I place an order for SB540-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SB540-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 SB540-T reliable?
The price and inventory of SB540-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SB540-T is usually 5 days.
3.What payment methods are accepted for SB540-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SB540-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SB540-T?
SB540-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SB540-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 SB540-T?
For technical support, including SB540-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SB540-T requirements.
6.How does Aetrix verify that SB540-T is sourced from the original manufacturer or authorized distributors?
All SB540-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 SB540-T meets industry standards.
7.What is the process for return or replacement of SB540-T?
All SB540-T units undergo pre-shipment inspection (PSI). If there is an issue with SB540-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 SB540-T part is unused and in its original packaging.
Return procedure for SB540-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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