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Nexperia USA Inc. BAS70W-QX
- Part No.:
- BAS70W-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BAS70W-QX.pdf
- Description:
- BAS70W-Q/SOT323/SC-70
- Quantity:
- Payment:
- Shipping:
Inventory:4,510
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Product details
Overview
BAS70W-Q from Nexperia is a general-purpose Schottky diode in SOT323 (SC-70) package, rated for 70 V reverse voltage, 70 mA forward current, and 410 mV forward voltage at 1 mA pulsed condition. It delivers ultra-high-speed switching and low leakage (<100 nA at 50 V), qualified to AEC-Q101 for automotive signal clamping and protection circuits.
For engineers reviewing the BAS70W-Q datasheet, BAS70W-Q pinout, BAS70W-Q application, or BAS70W-Q equivalent, this device is selected for compact, high-reliability voltage clamping in automotive power management, ESD-sensitive signal paths, and space-constrained DC-DC feedback networks where low VF and sub-2 pF capacitance are critical.
Technical Context
The BAS70W-Q employs a planar Schottky barrier structure optimized for fast recovery (no minority carrier storage), enabling operation in ultra-high-frequency switching applications up to several hundred MHz. Its 2 pF junction capacitance at 0 V and 1 MHz supports minimal signal distortion in RF detector and sampling circuits.
Thermal resistance of 625 K/W (junction-to-ambient, FR4 PCB, single-sided copper) defines its derating behavior under continuous conduction. The n.c. (pin 2) terminal provides mechanical stability without electrical function, confirming true 2-terminal diode operation within a 3-pin SOT323 footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (Reverse Voltage) | 70 V - Maximum blocking capability before breakdown; sets upper limit for clamping voltage in transient suppression. |
| VF (Forward Voltage) | 410 mV @ 1 mA pulsed - Enables low-loss biasing and sensing in low-power analog front-ends. |
| IR (Reverse Current) | 100 nA @ 50 V - Ensures minimal leakage in high-impedance voltage divider or reference nodes. |
| Cd (Junction Capacitance) | 2 pF @ 0 V, 1 MHz - Supports clean signal integrity in RF detector and high-speed logic interface applications. |
| IF (Forward Current) | 70 mA continuous - Defines maximum steady-state current handling in clamp or freewheeling paths. |
| Tj (Max Junction Temp) | 150 °C - Allows operation in under-hood automotive environments with validated thermal margin. |
Pinout & Package
Package: SOT323 (SC-70), 2.0 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, surface-mount plastic package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Positive terminal for forward conduction; connects to higher-potential node in clamping or rectification path. |
| 2 | Not Connected (n.c.) | Mechanical support only; must remain unconnected in PCB layout to avoid parasitic coupling or solder bridging. |
| 3 | Cathode (K) | Negative terminal; ties to reference or ground in clamp configurations; carries return current during conduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 standards. |
| Low forward voltage | 410 mV typ. at 1 mA enables efficient biasing in low-voltage sensor interfaces without significant IR drop. |
| Ultra-low junction capacitance | 2 pF at 0 V allows integration into >500 MHz RF detector and sampling circuits without bandwidth degradation. |
| High reverse breakdown voltage | 70 V rating supports use in 48 V automotive systems and industrial 24–48 V supply rail protection. |
Applications
| Automotive CAN Transceiver Protection | USB 2.0 ESD Clamp |
|---|---|
Use Scenario: Protects CANH/CANL lines against ISO 7637-2 transients and IEC 61000-4-2 ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between transceiver I/O and ground, leveraging low VF and fast response to shunt surge energy. Use Value: Prevents latch-up and damage in transceivers by clamping spikes to <1.2 V above VCC or below GND using matched dual-BAS70W-Q pairs. |
Use Scenario: Integrated into USB 2.0 data line (D+/D−) protection circuitry on host/device ports. IC Role / Device Role / Timing Role: Low-capacitance Schottky clamp limiting signal swing to safe levels during ±8 kV contact ESD events. Use Value: Maintains 480 Mbps signal integrity with <2 pF loading while diverting >1 A peak ESD current away from PHY inputs. |
| DC-DC Feedback Divider Clamp | RF Signal Detector Diode |
Use Scenario: Clamps feedback node voltage in isolated flyback or buck-boost converters to prevent controller overvoltage shutdown. IC Role / Device Role / Timing Role: Fast-switching Schottky placed across upper feedback resistor to clip excursion during load transients. Use Value: Enables stable regulation under dynamic loads by limiting feedback voltage to ≤1.5 V without affecting steady-state accuracy. |
Use Scenario: Used as envelope detector in 868 MHz ISM-band receiver front-end for wireless sensor nodes. IC Role / Device Role / Timing Role: Passive demodulator converting RF amplitude to baseband DC voltage via rectification. Use Value: Achieves >−15 dBm sensitivity with minimal distortion due to low series resistance and 2 pF capacitance at RF frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSR0230HT1G | Lower VF (270 mV @ 1 mA) but higher IR (2 µA @ 50 V); SOD-523 package (1.2 × 0.8 mm). | Better efficiency in ultra-low-power biasing; less suitable for high-impedance clamping due to 20× higher leakage. | Select when minimizing forward loss dominates; verify leakage tolerance in precision reference paths. |
| Vishay VS-2EDH01HM3/85A | Higher VR (100 V), same VF (410 mV), larger SOD-323 package; AEC-Q101 qualified. | Supports 48 V+ battery systems and higher-energy transients; requires 30% more board area. | Choose for enhanced voltage margin in 48 V automotive subsystems where footprint is not constrained. |
Compared with NSR0230HT1G and VS-2EDH01HM3/85A, the BAS70W-Q uniquely balances 70 V rating, 2 pF capacitance, and AEC-Q101 compliance in the smallest qualified SC-70 footprint-making it optimal for dense, high-frequency automotive signal conditioning where leakage, size, and reliability are jointly critical.
Availability
BAS70W-Q is available at Aetrix Electronics and suitable for automotive ECU protection, USB interface clamping, and DC-DC feedback stabilization requiring stable component supply across production lifecycles.
Supply support for BAS70W-Q 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
Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
The BAS70W-Q belongs to Nexperia's AEC-Q101-qualified Schottky diode portfolio, engineered specifically for robust voltage clamping and ultra-fast switching in harsh automotive signal and power domains.
FAQ
Is BAS70W-Q suitable for bidirectional ESD protection?
No - BAS70W-Q is a unidirectional Schottky diode with anode and cathode terminals. For bidirectional protection, two devices must be used in series opposition (anode-to-anode or cathode-to-cathode), as confirmed in Nexperia's application note AN11120 for automotive I/O clamping.
What is the maximum allowable PCB pad temperature during reflow soldering?
The BAS70W-Q supports standard lead-free reflow per JEDEC J-STD-020, with peak temperature of 260 °C for ≤30 seconds. The recommended profile uses ramp rate ≤3 °C/s, preheat 150–200 °C for 60–120 s, and time above liquidus (TAL) of 60–90 s at 235–245 °C, per Nexperia's SOT323 reflow guidelines.
Does pin 2 require grounding or can it be left floating?
Pin 2 is explicitly marked "n.c." (not connected) in the datasheet and has no internal connection. It must remain electrically unconnected - neither grounded nor tied to any net - to avoid unintended coupling or solder shorts; PCB land should be isolated per Figure 6 footprint.
How does thermal resistance change with copper pour area on FR4?
Rth(j-a) drops from 625 K/W (single-sided 1 oz Cu, standard footprint) to ~320 K/W with 25 mm² double-sided copper pour and thermal vias, as measured in Nexperia's thermal characterization report TN00003. No derating is needed below 50 mW dissipation at Tamb = 85 °C.
BAS70W-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 70 V
- Current - Average Rectified (Io):
- 70mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 15 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 10 µA @ 70 V
- Capacitance @ Vr, F:
- 2pF @ 0V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
- Operating Temperature - Junction:
- 150°C
BAS70W-QX FAQ
1.How can I place an order for BAS70W-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS70W-QX 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 BAS70W-QX reliable?
The price and inventory of BAS70W-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS70W-QX is usually 5 days.
3.What payment methods are accepted for BAS70W-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS70W-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS70W-QX?
BAS70W-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS70W-QX 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 BAS70W-QX?
For technical support, including BAS70W-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS70W-QX requirements.
6.How does Aetrix verify that BAS70W-QX is sourced from the original manufacturer or authorized distributors?
All BAS70W-QX 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 BAS70W-QX meets industry standards.
7.What is the process for return or replacement of BAS70W-QX?
All BAS70W-QX units undergo pre-shipment inspection (PSI). If there is an issue with BAS70W-QX, 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 BAS70W-QX part is unused and in its original packaging.
Return procedure for BAS70W-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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