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Nexperia USA Inc. BAS40H-QX
- Part No.:
- BAS40H-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SOD-123F
- Datasheet:
-
BAS40H-QX.pdf
- Description:
- BAS40H-Q/SOD123F/SOD2
- Quantity:
- Payment:
- Shipping:
Inventory:540
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Product details
Overview
BAS40H-Q from Nexperia is a general-purpose Schottky diode in SOD123F package, designed for ultra-high-speed switching and voltage clamping in automotive-grade circuits. It delivers 40 V reverse voltage rating, 120 mA forward current capability, 380 mV forward voltage at 1 mA, 5 pF capacitance at 0 V, and AEC-Q101 qualification for under-hood electronics.
For engineers reviewing the BAS40H-Q datasheet, BAS40H-Q pinout, BAS40H-Q application, or BAS40H-Q equivalent, key selection criteria include low VF at low IF, sub-1 µA IR at 30 V, thermal resistance of 330 K/W on FR4, and compatibility with reflow soldering per SOD123F footprint.
Technical Context
This Schottky diode uses a planar epitaxial construction to achieve fast recovery (no minority-carrier storage), enabling operation up to 1 GHz small-signal frequencies. Its low junction capacitance (5 pF) and differential resistance <1 Ω at 10 mA support high-frequency signal routing and RF decoupling.
The device operates across –65 °C to +150 °C ambient and junction temperature ranges, with thermal resistance from junction-to-ambient measured at 330 K/W on single-sided tin-plated FR4 PCB - critical for thermally constrained automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VR) | 40 V - supports 24 V automotive systems with 2× safety margin against load-dump transients |
| Forward Voltage (VF) | 380 mV @ 1 mA - minimizes conduction loss in low-current bias and sensing paths |
| Reverse Current (IR) | 1 µA @ 30 V - ensures low leakage in high-impedance clamp and hold circuits |
| Capacitance (Cd) | 5 pF @ 0 V, 1 MHz - enables clean signal integrity in >100 MHz clock or data line clamping |
| Thermal Resistance (Rth(j-a)) | 330 K/W - defines power derating to ≤360 mW at Tamb = 85 °C on standard FR4 layout |
| Junction Temperature (Tj) | 150 °C maximum - allows sustained operation in engine control unit (ECU) and body controller environments |
Pinout & Package
SOD123F surface-mount plastic package: 2.6 mm × 1.6 mm × 1.1 mm body, flat lead profile optimized for automated placement and reflow reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (marked side) | Cathode (K) | Marking bar identifies cathode; connects to lower-potential node in clamping or rectification path |
| 2 | Anode (A) | Unmarked terminal; connects to higher-potential source in forward-biased operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine management, lighting, and ADAS sensor interfaces |
| Low forward voltage | 380 mV at 1 mA enables efficient biasing in low-power microcontroller I/O protection networks |
| High-speed switching | No minority-carrier storage enables sub-nanosecond recovery - suitable for >500 MHz RF envelope detection |
| Low leakage current | ≤10 µA at 40 V reverse bias maintains accuracy in precision voltage reference and sample-hold circuits |
| Small SMD footprint | SOD123F package reduces board area by 40% vs. SOD323 while maintaining thermal robustness |
Applications
| Automotive ECU Power Rail Clamping | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Suppressing load-dump transients on 12 V/24 V power rails in engine control units. IC Role / Device Role / Timing Role: Fast-acting voltage clamp placed between rail and ground to shunt surge energy before downstream regulators. Use Value: 40 V VR rating and 200 mA non-repetitive peak current withstand capability prevent rail collapse during ISO 7637-2 Pulse 5a events. |
Use Scenario: Protecting USB 2.0 D+ and D− lines from ESD and overvoltage in infotainment head units. IC Role / Device Role / Timing Role: Low-capacitance Schottky clamp to ground, placed adjacent to connector. Use Value: 5 pF capacitance preserves signal integrity up to 480 Mbps without eye diagram degradation. |
| Low-Power Sensor Bias Network | RF Signal Detector Diode |
Use Scenario: Providing stable bias current to MEMS pressure sensors in tire pressure monitoring systems (TPMS). IC Role / Device Role / Timing Role: Forward-biased Schottky used as low-VF current source element in high-impedance bias chain. Use Value: 380 mV VF at 1 mA ensures minimal voltage drop and predictable current across –40 °C to +125 °C. |
Use Scenario: Envelope detection in 900 MHz ISM-band receiver front-ends for keyless entry receivers. IC Role / Device Role / Timing Role: Passive demodulator diode converting RF amplitude to baseband DC voltage. Use Value: Sub-1 Ω dynamic resistance at 10 mA and low Cd enable >70% detection efficiency at –20 dBm input. |
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 | 30 V VR, 200 mA IF, VF = 450 mV @ 1 mA, SOD-123 package | Limited to 12 V systems; higher VF increases bias loss in low-power sensors | Select when cost sensitivity outweighs 40 V margin and leakage requirements |
| Vishay VS-2EDH01-M3/84A | 45 V VR, 200 mA IF, VF = 490 mV @ 1 mA, SOD-123 package, no AEC-Q101 | Not automotive-qualified; higher VF degrades efficiency in battery-powered modules | Prefer for industrial non-automotive designs requiring extended VR margin without qualification overhead |
Compared with NSR0230HT1G and VS-2EDH01-M3/84A, BAS40H-Q uniquely balances AEC-Q101 compliance, 40 V VR, and 380 mV VF - making it optimal for automotive power rail clamping where both transient margin and low-loss biasing are required.
Availability
BAS40H-Q is available at Aetrix Electronics and suitable for automotive ECUs, USB interface protection, TPMS sensor biasing, and RF detector circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BAS40H-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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.
BAS40H-Q belongs to Nexperia's AEC-Q101-qualified Schottky diode family, engineered specifically for robust performance in automotive power management, signal conditioning, and ESD protection applications.
FAQ
What is the maximum allowable junction temperature for continuous operation?
The absolute maximum junction temperature is 150 °C. For continuous operation, the device must be operated within its thermal limits: at Tamb = 85 °C, power dissipation must not exceed 360 mW (calculated from Rth(j-a) = 330 K/W). Derating curves in Figure 1 of the datasheet define safe operating area across temperature.
Is BAS40H-Q compatible with lead-free reflow soldering profiles?
Yes - BAS40H-Q is qualified for lead-free reflow per JEDEC J-STD-020, with peak temperature up to 260 °C. The recommended solder land pattern (Figure 6) and thermal profile ensure reliable joint formation without delamination or package cracking on SOD123F footprint.
How does the marking "AJ" correspond to the part number?
The marking "AJ" is the top-side laser-marked code for BAS40H-Q, as specified in Table 4 of the datasheet. It appears adjacent to the cathode bar on the SOD123F package body and is used for visual identification and traceability during assembly and inspection.
Can BAS40H-Q replace BAS40-04 in existing designs?
No - BAS40-04 is a dual-diode SOT-23 package with common-cathode configuration, while BAS40H-Q is a single-diode SOD123F device. Pin count, package dimensions, and electrical configuration differ fundamentally; redesign of layout and schematic is required for substitution.
BAS40H-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 120mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 40 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 10 µA @ 40 V
- Capacitance @ Vr, F:
- 5pF @ 0V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
- Operating Temperature - Junction:
- 150°C
BAS40H-QX FAQ
1.How can I place an order for BAS40H-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS40H-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 BAS40H-QX reliable?
The price and inventory of BAS40H-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS40H-QX is usually 5 days.
3.What payment methods are accepted for BAS40H-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS40H-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS40H-QX?
BAS40H-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS40H-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 BAS40H-QX?
For technical support, including BAS40H-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS40H-QX requirements.
6.How does Aetrix verify that BAS40H-QX is sourced from the original manufacturer or authorized distributors?
All BAS40H-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 BAS40H-QX meets industry standards.
7.What is the process for return or replacement of BAS40H-QX?
All BAS40H-QX units undergo pre-shipment inspection (PSI). If there is an issue with BAS40H-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 BAS40H-QX part is unused and in its original packaging.
Return procedure for BAS40H-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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