My Inquiry
My Account
Nexperia USA Inc. BAS40,235
- Part No.:
- BAS40,235
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BAS40,235.pdf
- Description:
- DIODE SCHOTTKY 40V 120MA TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,526
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BAS40,235 from Nexperia is a general-purpose Schottky diode in SOT23 package, designed for ultra-high-speed switching and voltage clamping. 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 automotive use.
For engineers reviewing the BAS40,235 datasheet, BAS40,235 pinout, BAS40,235 application, or BAS40,235 equivalent, key selection criteria include low VF for power efficiency, low Cd for RF/switching integrity, n.c. terminal isolation, thermal resistance (500 K/W), and automotive-grade reliability under transient stress.
Technical Context
The BAS40,235 implements a planar Schottky barrier structure optimized for fast recovery (no minority carrier storage) and low forward conduction loss. Its anode-cathode configuration with internal open-circuit terminal enables flexible PCB layout while maintaining signal path integrity in high-frequency clamp circuits.
Thermal performance is defined by junction-to-ambient resistance of 500 K/W on FR4 with single-sided copper, and operation is validated across −65 °C to +150 °C ambient range. Reverse leakage remains ≤10 µA at 40 V and 25 °C, supporting stable biasing in precision analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VR (Reverse Voltage) | 40 V - Maximum blocking voltage before breakdown; sets safe operating margin in 24 V automotive clamp designs. |
| VF (Forward Voltage) | 380 mV @ 1 mA - Low conduction loss enabling efficient signal-level rectification and logic-level clamping. |
| IF (Forward Current) | 120 mA continuous - Supports moderate-power switching without thermal derating in compact SOT23 footprint. |
| Cd (Capacitance) | 5 pF @ 0 V, 1 MHz - Minimizes signal distortion and timing skew in >100 MHz digital or RF interface protection paths. |
| IR (Reverse Current) | 10 µA @ 40 V, 25 °C - Ensures low standby power loss in battery-backed or always-on sensing circuits. |
| Rth(j-a) | 500 K/W - Defines thermal rise per watt on standard FR4; requires <250 mW dissipation for <125 °C junction temp. |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to higher-potential node in clamping or rectification path. |
| 2 | Not Connected (n.c.) | Internally unconnected; must be left floating or tied to ground only if required for mechanical stability-no electrical function. |
| 3 | Cathode (K) | Forward current exit and reverse-blocking terminal; ties to reference or return path in protection circuits. |
Key Features
| Feature | Design Value |
|---|---|
| High switching speed | No minority carrier storage → sub-nanosecond recovery; eliminates tail current in >100 MHz pulse clamping. |
| Low leakage current | ≤1 µA @ 30 V, 25 °C - preserves signal fidelity in high-impedance sensor interfaces and sample-hold circuits. |
| AEC-Q101 qualified | Validated for automotive underhood applications including engine control, lighting, and ADAS sensor protection. |
| Low capacitance | 5 pF at 0 V - maintains bandwidth >300 MHz in RF detector or ESD protection paths without resonance issues. |
Applications
| Automotive CAN Bus Protection | USB 2.0 Data Line Clamping |
|---|---|
Use Scenario: Protecting CAN_H/CAN_L lines against load dump transients and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between differential pair and transceiver I/O pins. Use Value: 40 V VR withstands ISO 7637-2 Pulse 5a (load dump), while 5 pF Cd avoids signal integrity degradation at 1 Mbps CAN bitrate. | Use Scenario: Preventing overvoltage damage to USB 2.0 D+/D− pins during hot-plug or ESD events. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp referenced to VBUS or GND. Use Value: 380 mV VF ensures clamping threshold stays below USB 2.0 receiver's absolute max rating (−0.5 V to 3.6 V), preserving eye diagram integrity. |
| RF Detector Input Protection | Logic-Level Signal Translation |
Use Scenario: Shielding RF detector diodes from antenna-coupled surges in GNSS or cellular front-ends. IC Role / Device Role / Timing Role: Pre-detector series or shunt clamp limiting input swing to ±0.4 V. Use Value: Sub-ns response time prevents transient energy from saturating downstream log amp or ADC input stages. | Use Scenario: Level-shifting 1.8 V logic signals to 3.3 V domains while providing overvoltage immunity. IC Role / Device Role / Timing Role: Anode-to-low-voltage rail, cathode-to-high-voltage rail configuration for passive translation. Use Value: 380 mV VF enables ~1.4 V output swing from 1.8 V input, with no active circuitry or propagation delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MBR0540T1G | Higher IF (500 mA), larger SOD-123 package, VF = 450 mV @ 100 mA | Better for power rectification; unsuitable for space-constrained RF layouts | Select when forward current >200 mA is required and board area allows SOD-123 footprint |
| 1N5711 | Through-hole DO-35, VF = 430 mV @ 10 mA, Cd = 4 pF, no AEC-Q101 | Limited to prototyping or non-automotive production; lacks automotive qualification | Choose only for lab validation or cost-sensitive non-automotive consumer designs |
Compared with MBR0540T1G and 1N5711, the BAS40,235 uniquely balances ultra-small SOT23 size, AEC-Q101 compliance, and sub-400 mV VF at low current-making it optimal for automotive signal-line protection where board space and reliability are co-constrained.
Availability
BAS40,235 is available at Aetrix Electronics and suitable for automotive ECU protection, USB interface clamping, RF front-end surge suppression, and logic-level translation requiring stable component supply and long-term manufacturability.
Supply support for BAS40,235 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 BAS40,235 belongs to Nexperia's general-purpose Schottky diode product line, engineered specifically for high-speed signal integrity and robust transient protection in automotive and industrial interface applications.
FAQ
Is the BAS40,235 pin-compatible with other SOT23 Schottky diodes?
Yes-the BAS40,235 uses standard SOT23 pinning (Anode–n.c.–Cathode), matching industry-standard footprints like those of BAT54 and NSR0230P2T5G. However, the n.c. pin is not internally bonded in all variants; verify layout clearance for unused pad per manufacturer layout guidelines.
What is the maximum allowable power dissipation for BAS40,235 in free air?
At 25 °C ambient, maximum power dissipation is 250 mW (calculated from Rth(j-a) = 500 K/W and Tj(max) = 150 °C). Derate linearly above 25 °C: 0.5 mW/°C reduction ensures junction temperature stays within 150 °C limit.
Does the n.c. pin require grounding or can it remain floating?
The pin 2 (n.c.) is electrically isolated and must remain unconnected. Grounding it may cause unintended parasitic coupling or solder bridging; Nexperia's layout recommendations specify leaving it floating unless mechanical reinforcement is needed-and even then, only tie to ground via a separate thermal pad, not the signal net.
How does BAS40,235 perform under repeated ESD stress per IEC 61000-4-2?
While not rated to a specific IEC 61000-4-2 level, its AEC-Q101 qualification includes human-body model (HBM) testing ≥2 kV and machine model (MM) ≥200 V. For system-level ESD protection, it must be used with external series impedance (e.g., 10 Ω resistor) to limit peak current during 8 kV contact discharge.
BAS40,235 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
- 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:
- TO-236AB
- Operating Temperature - Junction:
- 150°C (Max)
BAS40,235 FAQ
1.How can I place an order for BAS40,235 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS40,235 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 BAS40,235 reliable?
The price and inventory of BAS40,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS40,235 is usually 5 days.
3.What payment methods are accepted for BAS40,235?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS40,235 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS40,235?
BAS40,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS40,235 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 BAS40,235?
For technical support, including BAS40,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS40,235 requirements.
6.How does Aetrix verify that BAS40,235 is sourced from the original manufacturer or authorized distributors?
All BAS40,235 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 BAS40,235 meets industry standards.
7.What is the process for return or replacement of BAS40,235?
All BAS40,235 units undergo pre-shipment inspection (PSI). If there is an issue with BAS40,235, 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 BAS40,235 part is unused and in its original packaging.
Return procedure for BAS40,235:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAS40,235 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…
