My Inquiry
My Account
Nexperia USA Inc. BAS40W,115
- Part No.:
- BAS40W,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BAS40W,115.pdf
- Description:
- DIODE SCHOTTKY 40V 120MA SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,952
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BAS40W from Nexperia is a general-purpose Schottky diode in SOT323 (SC-70) package, designed for ultra-high-speed switching and voltage clamping with 40 V reverse voltage rating, 120 mA forward current capability, and 380 mV forward voltage at 1 mA. It features low leakage (≤10 µA at 40 V), low capacitance (5 pF), and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the BAS40W datasheet, BAS40W pinout, BAS40W application, or BAS40W equivalent, this discrete Schottky diode offers verified performance in high-frequency signal routing, transient suppression, and low-loss DC bias networks where fast recovery and minimal forward drop are critical.
Technical Context
The BAS40W leverages platinum-silicide Schottky barrier technology to achieve sub-nanosecond switching speed and negligible minority-carrier storage delay. Its 5 pF junction capacitance and 1 µA reverse leakage at 30 V enable stable operation in RF detector and sample-and-hold circuits up to ~100 MHz.
Thermal resistance of 625 K/W (junction-to-ambient, FR4 PCB, single-sided copper) defines its power dissipation limit under natural convection. The device operates across –65 °C to +150 °C ambient and junction temperatures, supporting under-hood automotive environments without derating below 120 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VR) | 40 V - Maximum blocking voltage before breakdown; suitable for 3.3 V/5 V/12 V rail clamping and flyback protection. |
| Forward Current (IF) | 120 mA continuous - Supports moderate-power signal path switching without thermal runaway on standard PCBs. |
| Forward Voltage (VF) | 380 mV @ 1 mA - Enables low-loss biasing in precision analog front-ends and low-voltage logic level translation. |
| Reverse Leakage (IR) | 10 µA @ 40 V - Ensures minimal standby current in battery-powered voltage clamp and hold circuits. |
| Junction Capacitance (Cd) | 5 pF @ 0 V - Permits use in >50 MHz signal routing without significant capacitive loading or phase shift. |
| Thermal Resistance (Rth(j-a)) | 625 K/W - Limits power dissipation to ~160 mW at 25 °C ambient; requires no heatsink in typical SMT layouts. |
Pinout & Package
Package: SOT323 (SC-70), 3-terminal surface-mount plastic package measuring 2.0 mm × 1.25 mm × 0.95 mm with 1.3 mm lead pitch. Terminal 2 is internally not connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to higher-potential node in clamping or rectification paths. |
| 2 | Not Connected (n.c.) | No internal bond wire or silicon connection; must remain unconnected in PCB layout to avoid parasitic coupling. |
| 3 | Cathode (K) | Forward current exit point; ties to reference or lower-potential node; carries full IF during conduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and body electronics per stress test requirements. |
| Low forward voltage | 380 mV at 1 mA enables efficient voltage translation in low-power microcontroller I/O protection circuits. |
| High-speed switching | Sub-ns recovery time supports >100 MHz clock signal steering and RF envelope detection without tail current. |
| Low junction capacitance | 5 pF minimizes signal distortion in high-frequency AC coupling and RF mixer local oscillator injection paths. |
Applications
| Automotive Engine Control Unit (ECU) | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Clamping induced transients on 5 V sensor supply rails during load dump events. IC Role / Device Role / Timing Role: Fast-acting voltage limiter placed between rail and ground, conducting within nanoseconds to shunt surge energy. Use Value: Prevents overvoltage damage to downstream ASICs using 40 V VR rating and 120 mA IF handling capability. |
Use Scenario: ESD and overvoltage protection on D+ and D− lines of USB 2.0 host ports. IC Role / Device Role / Timing Role: Bidirectional transient suppressor leveraging low VF and low Cd to preserve signal integrity up to 480 Mbps. Use Value: Maintains <1% signal attenuation at 240 MHz due to 5 pF capacitance and avoids data eye closure. |
| RF Signal Detector Circuit | Low-Voltage Logic Level Shifter |
Use Scenario: Envelope detection of 900 MHz ISM band signals in wireless sensor nodes. IC Role / Device Role / Timing Role: Zero-bias RF detector diode converting RF amplitude to DC voltage via Schottky barrier rectification. Use Value: Achieves >–20 dBm sensitivity with 380 mV VF and 5 pF Cd enabling broadband response without tuning. |
Use Scenario: Translating 1.8 V GPIO outputs to 3.3 V input thresholds in mixed-voltage MCU systems. IC Role / Device Role / Timing Role: Passive level translator using forward conduction to pull up or clamp logic levels. Use Value: Delivers deterministic switching with <1 ns propagation delay and no external bias required. |
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 (50 µA @ 30 V); same SOT-23 package. | Better efficiency in low-current bias networks; less suitable for high-temperature clamping due to leakage. | Select when minimizing forward loss dominates over leakage-critical hold time. |
| Vishay SD103ATW-TP | Higher IF (200 mA) and VR (35 V); SOD-123 package (larger footprint, higher Rth(j-a)). | Supports higher surge currents but adds 0.3 mm height and reduces board density. | Choose for industrial power supply snubbing where space is less constrained than in portable designs. |
Compared with NSR0230HT1G and SD103ATW-TP, the BAS40W delivers optimal balance of low VF, low Cd, and AEC-Q101 qualification in the smallest SMT footprint-making it preferred for space-constrained automotive and high-frequency signal applications.
Availability
BAS40W is available at Aetrix Electronics and suitable for automotive ECU design, USB 2.0 interface protection, and RF detector circuits requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for BAS40W 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.
The BAS40W belongs to Nexperia's general-purpose Schottky diode product line, engineered specifically for high-speed signal integrity and robust transient suppression in cost-sensitive, space-constrained applications.
FAQ
Is BAS40W suitable for bidirectional ESD protection?
No - the BAS40W is a unidirectional Schottky diode with anode and cathode terminals; it conducts only when anode is positive relative to cathode. For bidirectional ESD protection, a dual-diode array like PESD5V0S1BA is required. BAS40W is used in single-direction clamping configurations such as rail-to-ground or rail-to-rail.
What is the maximum allowable soldering temperature profile for BAS40W?
The BAS40W complies with JEDEC J-STD-020D reflow guidelines for MSL1 devices. Peak reflow temperature must not exceed 260 °C for ≤30 seconds, with ramp-up rate ≤3 °C/s and ramp-down rate ≤6 °C/s. Wave soldering is supported per Figure 7 footprint with preheat ≤100 °C and contact time ≤5 s.
Does BAS40W have a built-in thermal shutdown mechanism?
No - the BAS40W is a passive discrete diode with no integrated thermal protection circuitry. Safe operation depends on external thermal design: PCB copper area, ambient airflow, and power dissipation limits derived from its 625 K/W Rth(j-a) and 150 °C max junction temperature.
Can BAS40W replace BAT54 series diodes in existing designs?
Yes - the BAS40W shares identical SOT323 pinout and comparable electrical specs (VF ≈ 380 mV vs BAT54's 370 mV; VR = 40 V vs BAT54's 30 V). Its higher VR and AEC-Q101 qualification make it a functional upgrade, though layout review is recommended due to minor package dimension differences (e.g., body height 0.95 mm vs BAT54's 1.1 mm).
BAS40W,115 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):
- 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:
- SOT-323
- Operating Temperature - Junction:
- 150°C (Max)
BAS40W,115 FAQ
1.How can I place an order for BAS40W,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS40W,115 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 BAS40W,115 reliable?
The price and inventory of BAS40W,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS40W,115 is usually 5 days.
3.What payment methods are accepted for BAS40W,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS40W,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS40W,115?
BAS40W,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS40W,115 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 BAS40W,115?
For technical support, including BAS40W,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS40W,115 requirements.
6.How does Aetrix verify that BAS40W,115 is sourced from the original manufacturer or authorized distributors?
All BAS40W,115 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 BAS40W,115 meets industry standards.
7.What is the process for return or replacement of BAS40W,115?
All BAS40W,115 units undergo pre-shipment inspection (PSI). If there is an issue with BAS40W,115, 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 BAS40W,115 part is unused and in its original packaging.
Return procedure for BAS40W,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAS40W,115 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
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
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…
