My Inquiry
My Account
Nexperia USA Inc. BAS40-04-QR
- Part No.:
- BAS40-04-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BAS40-04-QR.pdf
- Description:
- DIODE ARR SCHOTTKY 40V TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:285
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BAS40-04-QR from Nexperia is a general-purpose dual Schottky diode in SOT23 package, configured as two independent diodes with shared cathode/anode terminals (A1–K1 and A2–K2). 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 is qualified to AEC-Q101 for automotive signal clamping and ultra-high-speed switching.
For engineers reviewing the BAS40-04-QR datasheet, BAS40-04-QR pinout, BAS40-04-QR application, or BAS40-04-QR equivalent, key selection criteria include low VF for power-sensitive logic interfaces, low Cd for RF/switching node integrity, AEC-Q101 qualification for under-hood use, and dual-diode topology enabling compact bidirectional protection or level-shifting circuits.
Technical Context
This dual Schottky diode integrates two independent junctions in a single SOT23-3 package with cross-coupled pinning: Pin 1 = A1 (anode of D1), Pin 2 = K2 (cathode of D2), Pin 3 = K1/A2 (shared cathode of D1 and anode of D2). Its architecture supports series-connected or back-to-back configurations without external routing.
Designed for high-speed operation, it exhibits 1 µA reverse leakage at 30 V and 10 µA at 40 V, 500 K/W junction-to-ambient thermal resistance on FR4, and maintains stable VF across -40 °C to 125 °C ambient - critical for automotive transceiver I/O protection and clock line clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VR) | 40 V - supports 3.3 V/5 V/12 V rail clamping without breakdown in automotive CAN/LIN or sensor interface lines |
| Forward Voltage (VF) | 380 mV @ 1 mA - minimizes voltage drop in low-current bias networks and logic-level translation paths |
| Reverse Leakage (IR) | 1 µA @ 30 V - ensures negligible standby current in always-on automotive modules |
| Diode Capacitance (Cd) | 5 pF @ 0 V, 1 MHz - preserves signal edge integrity up to ~100 MHz in high-speed data lines |
| Forward Current (IF) | 120 mA continuous - handles transient surge currents in ESD protection and power-rail decoupling paths |
| Junction Temperature (Tj) | 150 °C max - enables operation in engine control units and powertrain modules with minimal derating |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22-A114 |
Pinout & Package
Package: SOT23 (TO-236AB), 3-terminal surface-mount plastic package; 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch; optimized for reflow and wave soldering per IPC-7351B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode of Diode 1 (A1) | Input terminal for first Schottky path; connects to signal source or higher-potential rail in clamping configuration |
| 2 | Cathode of Diode 2 (K2) | Output terminal for second Schottky path; routes clamped or steered current to reference or ground |
| 3 | Cathode of Diode 1 / Anode of Diode 2 (K1; A2) | Shared node enabling series or anti-parallel connection; used for bidirectional TVS-like behavior or level shifting |
Key Features
| Feature | Design Value |
|---|---|
| High switching speed | Sub-nanosecond recovery time enabled by low stored charge and Schottky barrier physics - critical for >10 MHz digital signal routing |
| Low leakage current | ≤10 µA at VR = 40 V and 25 °C - preserves battery life in always-on vehicle modules and avoids false triggering in sensing circuits |
| Dual-diode integration | Two independent Schottky junctions in one SOT23 footprint - reduces PCB area by 40% vs. discrete dual-Diode solutions |
| AEC-Q101 qualification | Stress-tested for automotive environments including 1000-cycle temperature cycling (-40 °C to +125 °C) and 1000-hour HTRB - meets ASIL-B supporting requirements |
| Low capacitance | 5 pF typical at 0 V reverse bias - limits capacitive loading on high-frequency clocks, USB D+/D−, and LIN bus signals |
Applications
| Automotive Sensor Interface | USB 2.0 Data Line Protection |
|---|---|
|
Use Scenario: Protecting analog outputs of pressure/temperature sensors connected to MCU ADC inputs in engine bay modules. IC Role / Device Role: Dual-diode clamping network limiting input voltage to ±0.3 V beyond supply rails while preserving signal fidelity. Use Value: Prevents ADC saturation and latch-up during load-dump transients (ISO 7637-2 Pulse 5a), leveraging 40 V VR and 380 mV VF for minimal offset error. |
Use Scenario: Bidirectional ESD and overvoltage protection on USB 2.0 D+ and D− lines in infotainment head units. IC Role / Device Role: Back-to-back Schottky configuration using Pins 1–3 and 2–3 to clamp both positive and negative transients to VDD and GND. Use Value: 5 pF capacitance avoids signal integrity degradation at 480 Mbps; AEC-Q101 qualification ensures compliance with automotive USB reliability standards. |
| LVDS Receiver Input Clamp | Logic-Level Translation |
|
Use Scenario: Guarding LVDS receiver inputs against overshoot/undershoot caused by PCB trace reflections or hot-plug events. IC Role / Device Role: Low-capacitance dual clamp referenced to VCC and GND, placed directly at receiver pins. Use Value: 5 pF Cd prevents rise-time degradation; 120 mA IF rating absorbs short-duration ESD pulses (IEC 61000-4-2 Level 4) without failure. |
Use Scenario: Translating 1.8 V logic signals to 3.3 V domains in ADAS camera modules with strict power budget constraints. IC Role / Device Role: Passive level shifter using forward-biased Schottky diodes with pull-up resistors on the high-voltage side. Use Value: 380 mV VF enables near-zero static offset; dual configuration allows simultaneous translation of complementary signals (e.g., CLK/CLK#). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSR20F40NXT5G | Same SOT23-3 package; 40 V VR, but VF = 450 mV @ 1 mA and Cd = 8 pF - higher conduction loss and capacitance | Less suitable for <100 MHz signal paths or ultra-low-power bias networks due to higher VF and Cd | Select when legacy ON Semi BOM compatibility is required and 70 mV VF penalty is acceptable |
| Diodes Incorporated BAV99WQ-7-F | 40 V VR, VF = 400 mV @ 1 mA, Cd = 2 pF, but not AEC-Q101 qualified - rated for industrial only | Not approved for automotive under-hood use; requires additional qualification effort for automotive OEM programs | Prefer for cost-sensitive industrial IoT gateways where AEC-Q101 is not mandated |
Compared with NSR20F40NXT5G and BAV99WQ-7-F, BAS40-04-QR uniquely combines AEC-Q101 qualification, lowest VF (380 mV), and industry-leading Cd/VF trade-off - making it the default choice for automotive signal integrity-critical designs requiring zero qualification overhead.
Availability
BAS40-04-QR is available at Aetrix Electronics and suitable for automotive sensor interfaces, USB 2.0 data line protection, and LVDS receiver input clamping requiring stable component supply, long-term lifecycle assurance, and full traceability.
Supply support for BAS40-04-QR 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, logic, and MOSFET devices for automotive, industrial, and consumer markets.
BAS40-04-QR belongs to Nexperia's AEC-Q101-qualified Schottky diode portfolio, engineered specifically for automotive signal conditioning, ESD protection, and high-speed logic interfacing where low VF, low Cd, and proven reliability are mandatory.
FAQ
Is BAS40-04-QR pin-compatible with BAS40-04W?
No. BAS40-04-QR uses SOT23-3 packaging with pinout A1–K2–(K1/A2), whereas BAS40-04W is in SOT323-3 with different pin assignment (A1–K1–A2). Mechanical and electrical pin mapping differs - direct substitution requires PCB redesign and layout verification.
What is the maximum pulsed forward current rating for BAS40-04-QR?
The non-repetitive peak forward current (IFSM) is 200 mA for tp ≤ 10 ms at Tj(init) = 25 °C. This rating applies to short-duration transients such as ESD events or inrush surges, and must be verified against thermal dissipation limits in the target PCB layout.
Can BAS40-04-QR be used in place of a single Schottky diode like BAS40-05?
Yes, but only one diode section should be used - for example, connect Pin 1 (A1) and Pin 3 (K1) as anode/cathode, leaving Pin 2 (K2) unconnected and floating. Unused terminals must be isolated per PCB design rules to avoid parasitic coupling or leakage paths.
Does BAS40-04-QR support reflow soldering per JEDEC J-STD-020?
Yes. The device is qualified for standard SnPb and lead-free reflow profiles. Peak temperature must not exceed 260 °C for ≤30 seconds, with ramp rates within JEDEC J-STD-020 Class 3 limits. Footprint dimensions match IPC-7351B SOT23 generic land pattern.
BAS40-04-QR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Diode Configuration:
- 1 Pair Series Connection
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io) (per Diode):
- 120mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 40 A
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 µA @ 30 V
- Operating Temperature - Junction:
- 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BAS40-04-QR FAQ
1.How can I place an order for BAS40-04-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS40-04-QR 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 BAS40-04-QR reliable?
The price and inventory of BAS40-04-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS40-04-QR is usually 5 days.
3.What payment methods are accepted for BAS40-04-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS40-04-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS40-04-QR?
BAS40-04-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS40-04-QR 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 BAS40-04-QR?
For technical support, including BAS40-04-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS40-04-QR requirements.
6.How does Aetrix verify that BAS40-04-QR is sourced from the original manufacturer or authorized distributors?
All BAS40-04-QR 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 BAS40-04-QR meets industry standards.
7.What is the process for return or replacement of BAS40-04-QR?
All BAS40-04-QR units undergo pre-shipment inspection (PSI). If there is an issue with BAS40-04-QR, 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 BAS40-04-QR part is unused and in its original packaging.
Return procedure for BAS40-04-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAS40-04-QR Tags
-
BAV99-7-F
Diodes Incorporated
-
BAT54C-7-F
Diodes Incorporated
-
BAV99,215
Nexperia USA Inc.
-
BAT54SLT1G
onsemi
-
BAV70LT1G
onsemi
-
BAT54CLT1G
onsemi
-
BAT54S-7-F
Diodes Incorporated
-
BAV99LT1G
onsemi
-
BAT54S,215
Nexperia USA Inc.
-
BAS40-04LT1G
onsemi
-
MMBD1503-TP
Micro Commercial Co
-
BAV99WT1G
onsemi
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…
