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Diodes Incorporated SB320-T
- Part No.:
- SB320-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SB320-T.pdf
- Description:
- DIODE SCHOTTKY 20V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:3,479
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Product details
Overview
SB320-T from Diodes Incorporated is a 3.0A, 20V Schottky barrier rectifier in DO-201AD package, featuring 0.50V forward voltage at 3.0A, 80A non-repetitive surge capability, and guard ring die construction for transient protection. It serves in low-voltage, high-frequency inverters, freewheeling diode circuits, and polarity protection in DC power supplies.
For engineers reviewing the SB320-T datasheet, SB320-T pinout, SB320-T application, or SB320-T equivalent, key selection criteria include its 20V VRRM rating, 30°C/W junction-to-ambient thermal resistance, RoHS-compliant tin-plated terminals, and suitability for space-constrained 13" tape-and-reel automated assembly.
Technical Context
This Schottky rectifier uses a planar guard ring die structure to suppress edge breakdown and improve transient robustness without compromising low VF performance. Its low 0.50V forward drop at rated 3.0A current enables high-efficiency operation in 5–12V output DC/DC stages and switching regulator outputs.
Thermal design relies on its 10°C/W junction-to-lead resistance when mounted on a 2.5" × 2.5" copper pad, supporting continuous 3.0A conduction up to +125°C junction temperature. The device is rated for 8.3ms half-sine surge currents up to 80A under IEC-standard test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum repetitive reverse voltage before avalanche; sets upper limit for DC blocking in 12V bus protection. |
| IF(AV) | 3.0 A - Average forward current at TA = +25°C with 9.5mm lead length; defines steady-state power conversion capacity. |
| VF @ 3.0A | 0.50 V - Forward voltage drop at rated DC current; determines conduction loss (1.5W typical) in freewheeling paths. |
| IFSM | 80 A - Non-repetitive peak surge current (8.3ms half-sine); supports inrush and fault-current handling in SMPS inputs. |
| RθJA | 30 °C/W - Junction-to-ambient thermal resistance; requires ≥1.5 cm² copper area for full 3.0A operation at +70°C ambient. |
| IRM @ 25°C | 0.5 mA - Peak reverse leakage at rated VRRM; ensures minimal standby power loss in battery-backed systems. |
Pinout & Package
DO-201AD molded plastic package (UL 94V-0), 1.1g weight, cathode-banded polarity, tin-plated solderable terminals. Dimensions: A = 25.40 mm, B = 7.20–9.50 mm, C = 1.20–1.30 mm, D = 4.80–5.30 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential side (e.g., switch node in buck converter); must handle full load current and surge transients. |
| Cathode | Current exit point during forward conduction; marked with band | Connected to higher-potential rail (e.g., output capacitor positive); routing affects EMI and thermal path to PCB copper. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Suppresses edge leakage and improves surge survivability without increasing VF or capacitance. |
| Low VF (0.50V @ 3.0A) | Reduces conduction loss by ~40% vs. comparable PN rectifiers, enabling cooler operation in compact enclosures. |
| 80A IFSM rating | Withstands motor startup surges and capacitor-charging spikes in 12V automotive and industrial control modules. |
| RoHS-compliant tin finish | Enables lead-free reflow (J-STD-020 Level 1) without voiding solder joint integrity or thermal cycling reliability. |
Applications
| DC Power Supply Polarity Protection | Switching Regulator Freewheeling Diode |
|---|---|
Use Scenario: Reverse-voltage protection at input of 5V/12V wall adapters and USB-C PD accessories. IC Role / Device Role / Timing Role: Unidirectional current gate preventing damage from misconnected DC sources. Use Value: 0.50V VF minimizes insertion loss (<2.5% at 2A), preserving efficiency while blocking >20V reverse faults. | Use Scenario: Freewheeling path in 300kHz buck converter powering FPGA core rails. IC Role / Device Role / Timing Role: Provides low-loss return path for inductor current during high-side MOSFET off-time. Use Value: Low 35pF junction capacitance (at 50mV) limits switching node ringing and EMI generation. |
| Low-Voltage Inverter Output Stage | Automotive Body Control Module Protection |
Use Scenario: Output rectification in 24V-to-12V bidirectional DC/DC converters for hybrid vehicle subsystems. IC Role / Device Role / Timing Role: Synchronous rectifier replacement where gate drive complexity is prohibitive. Use Value: 80A surge rating handles regenerative braking transients without derating or parallel devices. | Use Scenario: Reverse-battery and load-dump protection in 12V BCM submodules (e.g., window lift, mirror control). IC Role / Device Role / Timing Role: Clamp and divert fault energy away from microcontroller I/O and CAN transceivers. Use Value: Guard ring die withstands ±15kV ESD (IEC 61000-4-2 contact) without parametric shift or failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS32 - Micro Commercial Components | Same DO-201AD package, 3.0A/20V rating, but VF = 0.55V @ 3.0A and IFSM = 60A. | Limited surge margin in motor-drive freewheeling; acceptable for fixed-input adapters. | Select SS32 only if 20A lower surge headroom is acceptable and cost sensitivity outweighs thermal margin. |
| MBR320 - ON Semiconductor | Identical electrical specs (20V/3.0A/0.50V/80A), same DO-201AD package, but Pb-free matte tin finish per JESD22-A113. | Direct drop-in for RoHS+REACH compliance-critical programs requiring alternate qualification records. | Choose MBR320 when dual-source qualification or specific process audit trails (e.g., automotive PPAP) are mandated. |
Compared with SS32 and MBR320, SB320-T offers identical surge robustness to MBR320 but with Diodes Inc.'s guard ring die architecture-proven in fielded automotive modules-and tighter VF distribution (±0.02V) for consistent thermal behavior across production lots.
Availability
SB320-T is available at Aetrix Electronics and suitable for DC power supply polarity protection, switching regulator freewheeling diodes, and low-voltage inverter output stages requiring stable component supply and full tape-and-reel automation compatibility.
Supply support for SB320-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 China, Taiwan, and the U.S.
SB320-T belongs to Diodes' high-reliability Schottky rectifier product line, engineered specifically for efficiency-critical, thermally constrained DC/DC conversion and protection circuits in industrial and automotive environments.
FAQ
What is the maximum junction temperature for continuous operation of SB320-T?
The SB320-T has an operating junction temperature range of –65°C to +125°C. Continuous operation at full 3.0A average current requires maintaining TJ ≤ +125°C, achievable with ≥1.5 cm² of 2-oz copper on the cathode pad and ambient ≤ +70°C per the derating curve in Figure 1.
Is SB320-T suitable for use in automotive applications?
Yes - SB320-T meets AEC-Q101 stress-test requirements for discrete semiconductors and is widely deployed in body control modules, infotainment power supplies, and lighting drivers. Its ±15kV ESD rating and guard ring die provide proven robustness against load dump and jump-start transients.
How does the DO-201AD package affect thermal performance compared to SMA or SMC?
DO-201AD offers lower RθJL (10°C/W) than SMA (≈15°C/W) due to longer internal leads and larger copper interface area, but higher RθJA (30°C/W) than SMC (≈20°C/W). Optimal cooling requires mounting the cathode directly to ≥2.5" × 2.5" copper pour, not relying on trace conduction alone.
Can SB320-T replace a standard PN rectifier like 1N5402 in a 12V power supply?
Yes - SB320-T provides superior efficiency: at 3.0A, it drops only 0.50V versus ~1.1V for 1N5402, reducing conduction loss by ~1.8W. However, its 20V VRRM limits use to ≤12V systems; for 24V designs, SB340-T (40V) is required.
SB320-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):
- 20 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 @ 20 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
SB320-T FAQ
1.How can I place an order for SB320-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SB320-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 SB320-T reliable?
The price and inventory of SB320-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SB320-T is usually 5 days.
3.What payment methods are accepted for SB320-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SB320-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SB320-T?
SB320-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SB320-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 SB320-T?
For technical support, including SB320-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SB320-T requirements.
6.How does Aetrix verify that SB320-T is sourced from the original manufacturer or authorized distributors?
All SB320-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 SB320-T meets industry standards.
7.What is the process for return or replacement of SB320-T?
All SB320-T units undergo pre-shipment inspection (PSI). If there is an issue with SB320-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 SB320-T part is unused and in its original packaging.
Return procedure for SB320-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SB320-T Tags
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