My Inquiry
My Account
Diodes Incorporated BAS521Q-13
- Part No.:
- BAS521Q-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BAS521Q-13.pdf
- Description:
- DIODE GEN PURP 300V 250MA SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:19,646
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BAS521Q-13 from Diodes Incorporated is a high-voltage, fast-switching silicon switching diode in SOD-523 package, rated for 300 V repetitive peak reverse voltage and 250 mA forward current, with 50 ns reverse recovery time and 100 nA leakage at 5 V reverse bias - used in automotive-level ESD protection and flyback snubber circuits.
For engineers reviewing the BAS521Q-13 datasheet, BAS521Q-13 pinout, BAS521Q-13 application, or BAS521Q-13 equivalent, key selection criteria include its AEC-Q101 qualification, ultra-small SOD-523 footprint, 300 V breakdown margin, and low-capacitance (5 pF) performance in high-frequency switching nodes.
Technical Context
This diode operates as a unidirectional, single-junction silicon rectifier optimized for high-speed voltage clamping and transient suppression in automotive and industrial power rails. Its 300 V VRRM and 4.5 A non-repetitive surge rating enable robust operation in inductive load switching.
The device uses an alloy-42 leadframe with matte tin annealing and meets J-STD-020 moisture sensitivity Level 1. Thermal resistance of 385 °C/W (junction-to-ambient, FR-4 board) supports reliable operation up to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 300 V - Withstands repetitive reverse transients up to 300 V without breakdown in DC blocking or snubber applications. |
| trr | 50 ns - Enables efficient high-frequency switching (>1 MHz) in flyback converters and signal routing paths. |
| IF | 250 mA - Supports continuous forward conduction in low-power logic-level clamp and bias networks. |
| IR @ VR=5V | 100 nA - Ensures minimal leakage-induced error in precision voltage reference or sensor interface circuits. |
| CT @ VR=0V | 5 pF - Limits capacitive loading on high-speed digital lines and RF detector inputs. |
| PD | 325 mW - Defines maximum steady-state power dissipation on standard FR-4 PCB with recommended pad layout. |
Pinout & Package
Package: SOD-523 - ultra-compact surface-mount plastic case (1.2 mm × 0.8 mm × 0.6 mm), cathode marked by bar on top surface, terminals finished with matte tin over alloy-42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward current entry node | Connected to lower-potential side of circuit; enables conduction when biased positive relative to cathode. |
| Cathode (Pin 2, bar-marked) | Forward current exit node / reverse voltage reference | Marked terminal; connects to higher-potential rail in clamping configurations or return path in rectification. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified reliability | Validated for automotive-grade temperature cycling (-65°C to +150°C), humidity, and mechanical stress per JEDEC standards. |
| Lead-free & halogen-free "Green" construction | Meets RoHS 2 (2011/65/EU) and contains <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - compliant for eco-sensitive end equipment. |
| SOD-523 footprint compatibility | Enables direct replacement of legacy SOD-523 diodes (e.g., BAS16, BAV99) without PCB redesign. |
| Low thermal resistance mounting | 385 °C/W RθJA on FR-4 allows >200 mW usable power at +85°C ambient without derating. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Clamps inductive kickback from solenoid drivers and relay coils in 12 V/24 V vehicle subsystems. IC Role / Device Role / Timing Role: Fast-recovery switching diode providing bidirectional transient suppression and freewheeling path. Use Value: 300 V VRRM withstands load-dump spikes; 50 ns trr prevents energy loss during rapid coil de-energization. | Use Scenario: Protects 24 V digital input channels against ESD and field-wiring surges in factory automation controllers. IC Role / Device Role / Timing Role: Standoff diode in series with optocoupler input, limiting reverse voltage across isolation barrier. Use Value: 100 nA leakage ensures stable logic threshold detection; SOD-523 size fits dense I/O header layouts. |
| USB Port ESD Clamp | DC-DC Converter Snubber |
Use Scenario: Placed between USB D+/D− lines and ground to shunt ±8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Low-capacitance (5 pF) transient voltage suppressor maintaining signal integrity up to 480 Mbps. Use Value: Minimal added capacitance avoids USB 2.0 eye diagram degradation; AEC-Q101 grade supports automotive infotainment ports. | Use Scenario: Absorbs leakage inductance energy in synchronous buck converter output stage during high-side FET turn-off. IC Role / Device Role / Timing Role: Fast-recovery snubber diode placed across transformer primary or MOSFET drain-source. Use Value: 50 ns trr and 300 V rating prevent voltage overshoot exceeding MOSFET VDSS limit in 24–48 V industrial supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAS16W-7-F | Same SOD-323 package; 100 V VRRM, 4 ns trr, 150 mA IF | Limited to ≤100 V systems; faster but lower voltage margin | Select only where 100 V rating suffices and sub-10 ns switching is critical. |
| 1N4148W-7-F | SOD-123 package; 100 V VRRM, 4 ns trr, 300 mA IF | Larger footprint (3.5 mm × 1.4 mm); not AEC-Q101 qualified | Use in non-automotive, cost-sensitive designs requiring higher IF and faster trr. |
Compared with BAS16W-7-F and 1N4148W-7-F, the BAS521Q-13 uniquely delivers 300 V standoff in the smallest SOD-523 form factor with automotive qualification - making it the only choice for space-constrained, high-voltage, mission-critical switching where leakage, size, and reliability are jointly constrained.
Availability
BAS521Q-13 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input protection, USB port ESD clamping, and DC-DC converter snubber circuits requiring stable component supply and long-term lifecycle assurance.
Supply support for BAS521Q-13 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, specializing in high-reliability components for automotive, industrial, and computing markets.
The BAS521Q belongs to Diodes' AEC-Q101-qualified high-voltage switching diode product line, engineered specifically for robust transient suppression and fast freewheeling in harsh-environment power management systems.
FAQ
What is the cathode identification method for BAS521Q-13?
The cathode is marked by a visible bar on the top surface of the SOD-523 package, aligned with Pin 2. This matches the device schematic showing the bar adjacent to the triangle symbol's base. Visual inspection under 10× magnification confirms polarity before placement.
Does BAS521Q-13 support reflow soldering per J-STD-020?
Yes - the device is rated for moisture sensitivity Level 1 and qualified for standard Pb-free reflow profiles (peak 260°C, 30 sec max). Its matte tin finish and alloy-42 leadframe ensure reliable wetting and intermetallic formation without voiding or tombstoning.
Can BAS521Q-13 replace BAS21 in existing designs?
No - BAS21 is a DO-35 through-hole diode rated for 250 V and packaged in axial leaded format. BAS521Q-13 is SOD-523 surface-mount with 300 V rating and different thermal and mechanical behavior; PCB redesign and layout validation are required for substitution.
What is the maximum operating temperature for continuous use?
The junction temperature must not exceed +150°C. At +85°C ambient, the 325 mW power rating allows ~210 mW continuous dissipation (derated per Figure 1 curve), assuming standard FR-4 board with Diodes' recommended pad layout (0.80 mm × 0.60 mm pads).
BAS521Q-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 300 V
- Current - Average Rectified (Io):
- 250mA
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
- Operating Temperature - Junction:
- -65°C ~ 150°C
BAS521Q-13 FAQ
1.How can I place an order for BAS521Q-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS521Q-13 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 BAS521Q-13 reliable?
The price and inventory of BAS521Q-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS521Q-13 is usually 5 days.
3.What payment methods are accepted for BAS521Q-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS521Q-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS521Q-13?
BAS521Q-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS521Q-13 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 BAS521Q-13?
For technical support, including BAS521Q-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS521Q-13 requirements.
6.How does Aetrix verify that BAS521Q-13 is sourced from the original manufacturer or authorized distributors?
All BAS521Q-13 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 BAS521Q-13 meets industry standards.
7.What is the process for return or replacement of BAS521Q-13?
All BAS521Q-13 units undergo pre-shipment inspection (PSI). If there is an issue with BAS521Q-13, 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 BAS521Q-13 part is unused and in its original packaging.
Return procedure for BAS521Q-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAS521Q-13 Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
