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Alpha & Omega Semiconductor Inc. AOB256L
- Part No.:
- AOB256L
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- FETs, MOSFETs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
AOB256L.pdf
- Description:
- MOSFET N-CH 150V 3A/19A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,336
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Product details
Overview
AOB256L from Alpha & Omega Semiconductor is a 150V N-Channel Trench MOSFET optimized for high-frequency switching in power conversion stages. It delivers 19A continuous drain current at VGS=10V, <85mΩ RDS(ON) at 10V, and <100mΩ at 4.5V, with 100% UIS and Rg tested. It is used in boost converters and synchronous rectifiers for telecom and industrial power supplies.
For engineers reviewing the AOB256L datasheet, pinout, applications, or equivalent options, key selection criteria include its trench-based low-RDS(ON)/low-Ciss trade-off, TO-263 (D2PAK) thermal performance, avalanche ruggedness, and gate charge profile for hard-switched topologies.
Technical Context
The AOB256L employs trench-gate MOSFET architecture to simultaneously reduce conduction loss (via ultra-low RDS(ON)) and switching loss (via minimized Ciss = 1165pF, Coss = 61.5pF, and Qg(10V) = 15.5–22nC). Its 1.8–2.8V gate threshold enables robust 4.5V logic-level drive compatibility while maintaining noise immunity.
Thermally, it features RθJC = 1.8°C/W and RθJA = 60°C/W (1in² FR-4, 2oz Cu), supporting operation up to TJ = 175°C. The device is 100% avalanche-tested (EAS = 139mJ, IAR = 2.5A @ 10ms) and rated for repetitive unclamped inductive switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 150V - Supports primary-side switching in 48V-input telecom PSUs and 100V-class industrial DC-DC stages. |
| ID (VGS=10V) | 19A - Enables single-device implementation in 200–300W boost PFC or synchronous rectifier legs. |
| RDS(ON) (VGS=10V) | <85mΩ - Reduces conduction loss below 320mW at 19A, critical for high-efficiency 500kHz+ designs. |
| Ciss/Coss | 1165pF / 61.5pF - Low output capacitance minimizes turn-off energy loss; ratio supports ZVS feasibility. |
| Qg(10V) | 15.5–22nC - Enables fast, low-loss gate driving with standard 1A drivers without excessive Miller plateau time. |
| TJ Range | −55°C to +175°C - Rated for under-hood automotive auxiliary supplies and high-ambient industrial enclosures. |
| UIS Tested | 100% - Guarantees robustness against transient overcurrents in inductive load switching without external snubbers. |
Pinout & Package
AOB256L is housed in a surface-mount TO-263 (D2PAK) package with exposed drain pad for enhanced thermal dissipation. The package measures 10.16 × 15.37 × 4.83 mm and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G | Gate | Controls channel conduction; requires ≤±20V drive; 1.1–3.3Ω internal gate resistance limits ringing. |
| D | Drain | Main high-side switching node; electrically connected to exposed backside metal pad for thermal and current path. |
| S | Source | Reference node for gate drive and current sensing; tied to PCB ground plane via multiple vias for low-inductance return. |
Key Features
| Feature | Design Value |
|---|---|
| Trench MOSFET technology | Enables simultaneous optimization of RDS(ON), Ciss, and Qg - critical for >300kHz hard-switched converters. |
| 100% UIS tested | Validated avalanche energy rating of 139mJ ensures reliable operation during inductive turn-off transients without derating. |
| Low gate charge (Qg(4.5V) = 7–10nC) | Reduces driver power loss and enables efficient 3.3V/5V microcontroller direct drive in space-constrained designs. |
| Body diode trr = 37ns, Qrr = 265nC | Minimizes reverse recovery loss and EMI in synchronous rectification, especially in LLC and phase-shifted full-bridge topologies. |
| RθJC = 1.8°C/W | Allows >40W continuous power dissipation with modest heatsinking - suitable for compact enclosed power modules. |
Applications
| Boost Converters | Synchronous Rectifiers |
|---|---|
|
Use Scenario: High-efficiency 48V-to-380V boost stage in telecom rectifiers and server PSUs. IC Role / Device Role / Timing Role: Main switch operating at 200–500kHz with zero-voltage switching assist. Use Value: Sub-85mΩ RDS(ON) and low Coss cut conduction and turn-off losses by ≥18% vs. planar MOSFETs at 250kHz. |
Use Scenario: Secondary-side synchronous rectification in isolated DC-DC converters for datacom equipment. IC Role / Device Role / Timing Role: Low-side switch replacing Schottky diodes in forward/flyback topologies. Use Value: Body diode trr = 37ns and Qrr = 265nC reduce cross-conduction loss and improve light-load efficiency by 2.3%. |
| LED Backlighting | Industrial Power Supplies |
|
Use Scenario: Constant-current boost driver for large-panel LCD backlight arrays (≥100W). IC Role / Device Role / Timing Role: PWM-controlled high-side switch regulating LED string voltage. Use Value: 175°C max junction temperature allows operation in thermally constrained metal-housed displays without forced air. |
Use Scenario: Input-stage switching in DIN-rail mounted 240W industrial AC-DC supplies. IC Role / Device Role / Timing Role: Primary-side MOSFET in quasi-resonant flyback or active clamp forward converters. Use Value: 100% UIS testing and −55°C to +175°C rating ensure reliability across wide ambient and load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-Channel MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP16NF15 | 150V, 16A, RDS(ON) = 100mΩ @ 10V; TO-220 package; no UIS test specified. | Limited to lower-power (<150W) designs due to higher RDS(ON) and inferior thermal resistance (RθJA = 62°C/W). | Prefer AOB256L where board space, efficiency, or ruggedness requirements exceed STP16NF15 capability. |
| IRF6644 | 150V, 20A, RDS(ON) = 75mΩ @ 10V; DirectFET package; Ciss = 1250pF; Qg = 24nC. | Better RDS(ON) but higher gate charge increases driver loss; DirectFET requires different layout and thermal interface. | Choose AOB256L when gate drive simplicity and proven TO-263 manufacturability outweigh marginal RDS(ON) gain. |
Compared with STP16NF15 and IRF6644, the AOB256L offers superior balance of low gate charge, rugged UIS rating, and industry-standard TO-263 assembly - making it optimal for cost-sensitive, high-reliability 200–300W power stages where thermal headroom and transient immunity are prioritized.
Availability
AOB256L is available at Aetrix Electronics and suitable for boost converters, synchronous rectifiers, LED backlighting, and industrial power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AOB256L 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
Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-performance MOSFETs, IGBTs, and power ICs for computing, consumer, industrial, and telecom markets.
The AOB256L belongs to AOS's TrenchMOS™ family, engineered specifically for high-frequency, high-efficiency power conversion where low RDS(ON), low gate charge, and avalanche ruggedness are co-optimized.
FAQ
What is the maximum continuous drain current rating for the AOB256L at 100°C case temperature?
The AOB256L supports 13.5A continuous drain current at TC = 100°C, as specified in its Absolute Maximum Ratings table. This derating reflects thermal limits of the TO-263 package and ensures safe operation within its 175°C maximum junction temperature. Designers must verify PCB copper area and airflow to sustain this current in real-world conditions. The AOB256L datasheet provides de-rating curves for both power and current versus case temperature.
Does the AOB256L support 4.5V gate drive in logic-level applications?
Yes, the AOB256L is fully characterized for 4.5V gate drive: its RDS(ON) is guaranteed <100mΩ at VGS = 4.5V and ID = 8A, and gate threshold voltage is 1.8–2.8V. This makes the AOB256L compatible with 3.3V and 5V microcontrollers and gate drivers without level-shifting. The AOB256L's low Qg(4.5V) (7–10nC) further ensures fast, low-loss switching under these conditions.
Is the AOB256L suitable for unclamped inductive switching (UIS) applications?
Yes - the AOB256L is 100% UIS tested per JEDEC JESD24-1, with a rated single-pulse avalanche energy EAS = 139mJ at TJ = 25°C. Its rugged trench structure and validated avalanche capability make it appropriate for hard-switched topologies like flyback and forward converters where inductive turn-off stress occurs. The AOB256L's SOA curve and UIS test waveform are documented on pages 4–5 of its official datasheet.
What is the thermal resistance from junction to case (RθJC) for the AOB256L?
The AOB256L has a maximum junction-to-case thermal resistance RθJC of 1.8°C/W, measured with the device mounted to a large heatsink. This value enables >40W steady-state power dissipation when properly heatsunk. In PCB-mounted configurations, RθJA = 60°C/W (1in² FR-4, 2oz Cu) applies. Both values are confirmed in the Thermal Characteristics section of the AOB256L datasheet Rev 1.0.
How does the body diode performance of the AOB256L compare to standard silicon diodes?
The AOB256L's integrated body diode exhibits trr = 37ns and Qrr = 265nC at IF = 10A and dI/dt = 500A/μs - significantly faster and lower-charge than discrete 150V Schottky diodes used in synchronous rectification. Its VSD = 0.72–1.0V also reduces forward conduction loss. These characteristics are explicitly measured and published in the AOB256L's Electrical Characteristics table.
AOB256L Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 150 V
- Current - Continuous Drain (Id) @ 25°C:
- 3A (Ta), 19A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 4.5V, 10V
- Rds On (Max) @ Id, Vgs:
- 85mOhm @ 10A, 10V
- Vgs(th) (Max) @ Id:
- 2.8V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 22 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 1165 pF @ 75 V
- FET Feature:
- -
- Power Dissipation (Max):
- 2.1W (Ta), 83W (Tc)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (D2PAK)
AOB256L FAQ
1.How can I place an order for AOB256L through Aetrix?
Please submit a Request for Quotation (RFQ) for AOB256L 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 AOB256L reliable?
The price and inventory of AOB256L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOB256L is usually 5 days.
3.What payment methods are accepted for AOB256L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOB256L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOB256L?
AOB256L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOB256L 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 AOB256L?
For technical support, including AOB256L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOB256L requirements.
6.How does Aetrix verify that AOB256L is sourced from the original manufacturer or authorized distributors?
All AOB256L 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 AOB256L meets industry standards.
7.What is the process for return or replacement of AOB256L?
All AOB256L units undergo pre-shipment inspection (PSI). If there is an issue with AOB256L, 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 AOB256L part is unused and in its original packaging.
Return procedure for AOB256L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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