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Diodes Incorporated BAS521LP-7
- Part No.:
- BAS521LP-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- 0402 (1006 Metric)
- Datasheet:
-
BAS521LP-7.pdf
- Description:
- DIODE GEN PURP 325V 400MA 2DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,807
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Product details
Overview
BAS521LP-7 from Diodes Incorporated is a high-voltage, ultra-fast switching diode in a 1.0 mm × 0.6 mm X1-DFN1006-2 package, rated for 325 V repetitive peak reverse voltage, 400 mA forward current, and 50 ns reverse recovery time. It serves as a signal-level clamp or flyback snubber in high-frequency power supply feedback loops and ESD-protected I/O interfaces.
For engineers reviewing the BAS521LP-7 datasheet, BAS521LP-7 pinout, BAS521LP-7 application, or BAS521LP-7 equivalent, key selection criteria include its 325 V VRRM, 50 nA IR at 5 V, 5 pF capacitance at 0 V, low-profile DFN footprint, and suitability for space-constrained DC-DC converter bias networks and telecom line protection circuits.
Technical Context
This diode employs a planar epitaxial silicon structure optimized for fast carrier recombination, enabling sub-50 ns trr under 30 mA IF/IR conditions with 0.1×IR tail current. Its 325 V VRRM rating supports operation across wide-input industrial and telecom power rails without cascading devices.
The X1-DFN1006-2 package uses NiPdAu-plated copper leadframe and UL 94V-0 green molding compound, delivering 312 °C/W junction-to-ambient thermal resistance on FR-4 with recommended pad layout - critical for sustained 400 mW power dissipation in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 325 V - supports direct connection to 277 VAC rectified lines or 24–48 V telecom systems with margin. |
| IF | 400 mA - sufficient for biasing optocouplers, gate drivers, or low-power logic clamping. |
| trr | 50 ns - enables use in >1 MHz switching converters without excessive switching loss. |
| CT | 5 pF @ 0 V - minimizes capacitive loading on high-impedance feedback nodes and signal paths. |
| IR | 50 nA @ 5 V - ensures negligible leakage in precision voltage reference or sensor bias networks. |
| PD | 400 mW - achievable with standard DFN thermal pad layout per AP02001 on FR-4 board. |
Pinout & Package
Package: X1-DFN1006-2 (1.0 mm × 0.6 mm × 0.5 mm), ultra-compact leadless plastic case with cathode marked by bar on top surface and solderable NiPdAu terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Forward current entry | Connected to lower-potential node (e.g., ground or switch node) in clamping or freewheeling paths. |
| 2 (Cathode) | Forward current exit / reverse blocking terminal | Marked with bar; ties to higher-potential rail or signal line requiring transient suppression or level shifting. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small DFN footprint | 1.0 mm × 0.6 mm area saves >60% board space vs. SOD-323 in dense power management IC layouts. |
| 325 V reverse breakdown | Enables single-diode protection in 24–48 V PoE injectors and industrial PLC input stages without series stacking. |
| 50 ns reverse recovery | Reduces switching loss and EMI in 500 kHz–2 MHz isolated flyback snubbers and synchronous rectifier gate drive clamps. |
| 50 nA leakage @ 5 V | Maintains accuracy in high-impedance voltage divider networks used for OVP monitoring and analog sensing front-ends. |
Applications
| Industrial Power Supply Feedback | Telecom Line Interface Protection |
|---|---|
Use Scenario: Isolated feedback path in 24 V/48 V DC-DC converters using optocoupler-based regulation. IC Role / Device Role: Fast-switching clamp diode protecting optocoupler LED anode during transient overvoltage events. Use Value: 325 V VRRM and 50 ns trr prevent latch-up and ensure stable loop response under load-step transients. | Use Scenario: Primary-side surge suppression on Ethernet PHY interface lines exposed to lightning-induced surges. IC Role / Device Role: Low-capacitance (5 pF) clamping diode shunting ESD pulses to ground before reaching sensitive PHY pins. Use Value: 50 nA leakage preserves signal integrity on 100 Ω differential pairs; DFN size fits tight PCB spacing near RJ45 magnetics. |
| Automotive Body Control Module Input | IoT Sensor Node Bias Clamping |
Use Scenario: Input conditioning for wake-up detection on 12 V battery-supplied microcontroller GPIOs. IC Role / Device Role: Reverse-polarity and load-dump protection diode on MCU input pins interfacing with external switches or sensors. Use Value: 325 V rating withstands ISO 7637-2 Pulse 5a (load dump up to 120 V); 0.0009 g mass reduces mechanical stress in vibration-prone modules. | Use Scenario: Voltage reference stabilization in battery-powered environmental sensor nodes with ±0.1% accuracy requirements. IC Role / Device Role: Low-leakage (50 nA @ 5 V) clamp limiting reference node excursions during RF burst interference. Use Value: Sub-100 nA leakage avoids measurable offset in 10 MΩ+ bias networks; RoHS/Green compliance meets IoT eco-labeling mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage fast-switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAS16H,115 (Nexperia) | VRRM = 100 V, trr = 4 ns, SOT-23 package (2.9 mm × 1.3 mm) | Lower voltage rating limits use to ≤24 V systems; faster switching suits <500 kHz designs. | Select only when 100 V margin suffices and board space allows larger SOT-23 footprint. |
| 1N4148W-7-F (Diodes Inc.) | VRRM = 100 V, trr = 4 ns, SOD-123 package (3.7 mm × 1.6 mm) | Higher leakage (25 nA @ 20 V), larger size, but widely available and cost-optimized for general-purpose use. | Prefer for non-critical 24 V applications where DFN assembly capability is unavailable. |
Compared with BAS16H,115 and 1N4148W-7-F, the BAS521LP-7 uniquely delivers 325 V standoff in a 1.0 mm × 0.6 mm footprint - essential for next-generation compact 48 V PoE and industrial edge controllers where voltage margin and board area are simultaneously constrained.
Availability
BAS521LP-7 is available at Aetrix Electronics and suitable for industrial power supplies, telecom line interfaces, automotive body control modules, and IoT sensor node designs requiring stable component supply and long-term obsolescence mitigation.
Supply support for BAS521LP-7 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 BAS521LP belongs to Diodes' high-voltage switching diode product line, engineered specifically for space-constrained, high-reliability applications in industrial automation, telecom infrastructure, and automotive subsystems demanding robust transient immunity and minimal parasitic capacitance.
FAQ
What is the maximum operating temperature for BAS521LP-7?
The BAS521LP-7 has an operating junction temperature range of –65 °C to +150 °C, with derated power dissipation above +25 °C ambient per the published curve (400 mW at 25 °C, linearly decreasing to zero at ~150 °C). Thermal performance depends on PCB pad layout per AP02001.
Is BAS521LP-7 suitable for reverse polarity protection?
Yes - its 325 V VRRM and 400 mA IF make it viable for low-current reverse polarity protection in 24–48 V systems. However, forward voltage drop (~1.1 V at 100 mA) causes higher conduction loss than MOSFET-based solutions; best suited for signal-level or auxiliary rail protection.
Does BAS521LP-7 have a specified avalanche rating?
No - the datasheet does not specify avalanche energy (EAS) or unclamped inductive switching capability. It is characterized for repetitive switching and steady-state reverse blocking only. For inductive load snubbing, use with external RC networks or TVS diodes is recommended.
Can BAS521LP-7 replace BAS21 in existing designs?
No - BAS21 is a TO-92 packaged 250 V diode with 300 ns trr and 200 mA IF. While voltage rating is close, BAS521LP-7's 50 ns trr, 400 mA IF, and DFN package require layout redesign and may alter thermal behavior; not a drop-in replacement without validation.
BAS521LP-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 0402 (1006 Metric)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 325 V
- Current - Average Rectified (Io):
- 400mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 150 nA @ 250 V
- Capacitance @ Vr, F:
- 5pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X1-DFN1006-2
- Operating Temperature - Junction:
- -65°C ~ 150°C
BAS521LP-7 FAQ
1.How can I place an order for BAS521LP-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS521LP-7 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 BAS521LP-7 reliable?
The price and inventory of BAS521LP-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS521LP-7 is usually 5 days.
3.What payment methods are accepted for BAS521LP-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS521LP-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS521LP-7?
BAS521LP-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS521LP-7 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 BAS521LP-7?
For technical support, including BAS521LP-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS521LP-7 requirements.
6.How does Aetrix verify that BAS521LP-7 is sourced from the original manufacturer or authorized distributors?
All BAS521LP-7 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 BAS521LP-7 meets industry standards.
7.What is the process for return or replacement of BAS521LP-7?
All BAS521LP-7 units undergo pre-shipment inspection (PSI). If there is an issue with BAS521LP-7, 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 BAS521LP-7 part is unused and in its original packaging.
Return procedure for BAS521LP-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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