My Inquiry
My Account
Diodes Incorporated BAS521LPQ-7B
- Part No.:
- BAS521LPQ-7B
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- 0402 (1006 Metric)
- Datasheet:
-
BAS521LPQ-7B.pdf
- Description:
- DIODE GEN PURP 325V 400MA 2DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,590
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BAS521LPQ-7B from Diodes Incorporated is a high-voltage, fast-switching silicon switching diode in an ultra-small X1-DFN1006-2 package (1.0 mm × 0.6 mm), rated for 325 V repetitive peak reverse voltage, 400 mA forward current, and 50 ns reverse recovery time - used in automotive power supply clamping and ESD-protected signal routing.
For engineers reviewing the BAS521LPQ-7B datasheet, BAS521LPQ-7B pinout, BAS521LPQ-7B application, or BAS521LPQ-7B equivalent, key selection criteria include AEC-Q101 qualification, low leakage (<50 nA at VR = 5 V), thermal resistance (312 °C/W), and compatibility with high-density PCB layouts requiring sub-1-mm² footprint.
Technical Context
This diode operates as a unidirectional voltage-blocking device with a planar epitaxial construction optimized for high-speed switching in DC-DC converter flyback snubbers and automotive load-dump protection circuits. Its 325 V VRRM rating enables use in 24 V and 48 V vehicle electrical systems without derating.
The device features a low 1.1 V forward voltage at 100 mA and exhibits only 5 pF junction capacitance at 0 V bias, supporting high-frequency signal integrity in CAN FD and LIN bus interface protection. Reverse recovery is characterized under standardized 30 mA IF/IR conditions with 0.1×IR tail current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 325 V - supports direct connection to 24 V/48 V automotive battery rails with margin against transients |
| IF | 400 mA - sufficient for low-power logic-level signal clamping and sensor interface protection |
| trr | 50 ns - enables operation up to ~10 MHz switching frequencies in snubber and clamp circuits |
| IR @ VR = 5 V | ≤50 nA - ensures minimal standby current leakage in always-on automotive modules |
| CT @ 0 V | 5 pF - preserves signal edge integrity in high-speed digital I/O protection paths |
| RθJA | 312 °C/W - requires thermal pad design on FR-4 for sustained 400 mW dissipation |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: X1-DFN1006-2 - ultra-compact 2-terminal surface-mount plastic package (1.0 mm × 0.6 mm × 0.5 mm), cathode marked by bar on top surface, NiPdAu-plated copper lead-frame, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 (Anode) | Forward current entry point | Connected to lower-potential node (e.g., ground or signal return) in clamping configuration |
| Terminal 2 (Cathode) | Forward current exit / reverse blocking terminal | Marked with bar; tied to protected line (e.g., CAN_H) to shunt overvoltage to ground |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | 325 V VRRM enables robust protection in 48 V automotive architectures without series stacking |
| Ultra-fast recovery | 50 ns trr minimizes switching loss and ringing in high-frequency DC-DC feedback paths |
| Low-leakage performance | 50 nA IR at 5 V allows integration into battery-sensitive always-on domains (e.g., body control modules) |
| AEC-Q101 qualification | Validated for automotive underhood environments (-55 °C to +150 °C operating range) |
Applications
| Automotive LIN Bus Protection | 48 V DC-DC Converter Snubber |
|---|---|
Use Scenario: Protects LIN transceiver pins from ISO 17987-2 transient pulses and ESD events in body electronics modules. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between LIN data line and ground rail. Use Value: 325 V VRRM withstands load-dump spikes; 50 nA leakage avoids disrupting LIN idle-state voltage thresholds. | Use Scenario: Absorbs leakage inductance energy during MOSFET turn-off in synchronous buck converters for ADAS power supplies. IC Role / Device Role / Timing Role: Fast-recovery snubber diode across primary-side switch or transformer winding. Use Value: 50 ns trr prevents reverse conduction overlap; 5 pF CT limits capacitive loading on gate drive signals. |
| Smart Sensor Interface Clamping | Industrial PLC Digital Input Protection |
Use Scenario: Shields analog/digital sensor outputs (e.g., pressure, temperature) from field-induced surges in engine bay harnesses. IC Role / Device Role / Timing Role: Bidirectional protection pair (with TVS) or single-ended clamp to VCC/GND. Use Value: Sub-1 mm² footprint fits tight sensor PCB real estate; AEC-Q101 ensures longevity in vibration-prone locations. | Use Scenario: Guards 24 V digital input channels in programmable logic controllers against wiring faults and inductive kickback. IC Role / Device Role / Timing Role: Reverse-biased clamping element connected between input terminal and system ground. Use Value: 325 V rating exceeds IEC 61000-4-4 Level 4 surge test requirements; 400 mW PD supports continuous duty in industrial ambient. |
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 |
|---|---|---|---|
| BAS21-7-F | VRRM = 250 V, trr = 50 ns, SOT-23 package (3.0 mm × 1.4 mm) | Larger footprint; lower voltage margin for 48 V systems | Select when board space permits larger package and 250 V rating suffices |
| 1N4148W-7-F | VRRM = 100 V, trr = 4 ns, SOD-123 package (2.7 mm × 1.6 mm) | Higher speed but insufficient for automotive transients | Use only in low-voltage consumer signal routing where <100 V stress applies |
Compared with BAS21-7-F and 1N4148W-7-F, the BAS521LPQ-7B uniquely combines AEC-Q101 qualification, 325 V rating, and 1.0 mm × 0.6 mm footprint - making it the sole option for space-constrained, high-reliability 48 V automotive clamping where both voltage headroom and thermal density matter.
Availability
BAS521LPQ-7B is available at Aetrix Electronics and suitable for automotive body control modules, 48 V DC-DC power supplies, and industrial PLC digital input protection requiring stable component supply despite its discontinued status.
Supply support for BAS521LPQ-7B 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 BAS521LPQ belongs to Diodes' AEC-Q101-qualified high-voltage switching diode product line, engineered specifically for compact, thermally efficient transient suppression in next-generation vehicle electrical architectures.
FAQ
Is BAS521LPQ-7B still in production?
No - Diodes Incorporated has officially discontinued the BAS521LPQ-7B (marked "OBSOLETE – PART DISCONTINUED" in DS40217 Rev. 3–4). Aetrix Electronics maintains limited legacy stock and supports last-time buys with full traceability and documentation for ongoing production programs.
What is the cathode marking convention for BAS521LPQ-7B?
The cathode is marked by a bar on the top surface of the X1-DFN1006-2 package, aligned with Terminal 2 per the bottom-view schematic in DS40217. The device must be oriented so the bar aligns with the designated cathode pad on the PCB layout.
Can BAS521LPQ-7B replace BAS16 in automotive designs?
No - BAS16 has only 100 V VRRM and lacks AEC-Q101 qualification. BAS521LPQ-7B's 325 V rating and automotive qualification make it unsuitable as a drop-in replacement; redesign is required to leverage its higher voltage capability and reliability validation.
What is the maximum allowable PCB pad size for thermal performance?
Per Note 6 in DS40217, optimal thermal performance assumes mounting on FR-4 with a 1" × 1" 2 oz copper pad. For the X1-DFN1006-2 footprint, recommended pad dimensions are 0.50 mm × 0.50 mm per terminal, with thermal relief traces connecting to internal ground planes to maintain RθJA ≤ 312 °C/W.
BAS521LPQ-7B 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X1-DFN1006-2
- Operating Temperature - Junction:
- -65°C ~ 150°C
BAS521LPQ-7B FAQ
1.How can I place an order for BAS521LPQ-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS521LPQ-7B 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 BAS521LPQ-7B reliable?
The price and inventory of BAS521LPQ-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS521LPQ-7B is usually 5 days.
3.What payment methods are accepted for BAS521LPQ-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS521LPQ-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS521LPQ-7B?
BAS521LPQ-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS521LPQ-7B 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 BAS521LPQ-7B?
For technical support, including BAS521LPQ-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS521LPQ-7B requirements.
6.How does Aetrix verify that BAS521LPQ-7B is sourced from the original manufacturer or authorized distributors?
All BAS521LPQ-7B 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 BAS521LPQ-7B meets industry standards.
7.What is the process for return or replacement of BAS521LPQ-7B?
All BAS521LPQ-7B units undergo pre-shipment inspection (PSI). If there is an issue with BAS521LPQ-7B, 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 BAS521LPQ-7B part is unused and in its original packaging.
Return procedure for BAS521LPQ-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAS521LPQ-7B 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…
