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Vishay General Semiconductor - Diodes Division SMBJ40AHE3_A/H
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- Part No.:
- SMBJ40AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40AHE3_A/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,050
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Product details
Overview
SMBJ40AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping fast-rising ESD and surge transients on power and signal lines. It features 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR at 1 mA), 64.5 V maximum clamping voltage (VC) at 9.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive power rail protection and industrial sensor interface circuits.
For engineers reviewing the SMBJ40AHE3_A/H datasheet, SMBJ40AHE3_A/H pinout, SMBJ40AHE3_A/H application, or SMBJ40AHE3_A/H equivalent, this device is selected for robust overvoltage protection where AEC-Q101 qualification, low clamping ratio (1.61×VWM), and <1 ns response time are critical in 12 V/24 V DC systems.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: under normal bias it presents <1 µA leakage at 40 V; when transient voltage exceeds VBR, it avalanches into low-impedance conduction to limit downstream voltage to ≤64.5 V. Its glass-passivated junction ensures stable breakdown and long-term reliability under repetitive surge stress.
Designed for PCB-level protection of MOSFET gates, microcontroller I/O, and CAN/LIN bus lines, it delivers 100 A non-repetitive forward surge capability (8.3 ms half-sine) and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. The cathode-band-marked SMB package supports automated placement and soldering per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 40 V - Maximum continuous reverse operating voltage before avalanche onset; defines safe operating margin for 36 V nominal systems. |
| VBR (Breakdown Voltage) | 44.4–49.1 V at 1 mA - Tight tolerance ensures predictable turn-on across temperature and production lot. |
| VC (Clamping Voltage) | 64.5 V at 9.3 A (10/1000 µs) - Limits transient voltage seen by protected ICs to safe levels during 600 W surges. |
| PPPM (Peak Pulse Power) | 600 W - Sustains high-energy lightning-induced transients (IEC 61000-4-5 Level 4) without degradation. |
| IPPM (Peak Pulse Current) | 9.3 A - Peak current handled during standardized 10/1000 µs surge; derates linearly above 25 °C ambient. |
| TJmax | 150 °C - Enables operation in under-hood automotive environments and industrial enclosures with elevated ambient. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including HTOL, TC, and ESD testing per AEC specification. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, cathode-band marked, matte tin-plated leads compliant with J-STD-002 solderability and JESD 22-B102 whisker resistance Class 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or lowest potential node; completes clamping path during reverse-biased surge events. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 12 V rail or sensor output); avalanche conduction initiates here when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity up to 4 kV (line-earth) in compact SMB footprint. |
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics requiring zero-failure field reliability over 15-year service life. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes voltage overshoot during clamping - critical for protecting 48 V tolerant interfaces and 3.3 V logic inputs. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without pre-baking or special handling, reducing manufacturing cost and risk. |
| Glass-passivated junction | Ensures stable VBR and low leakage (<1 µA) across -55 °C to +150 °C operating range. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (ISO 7637-2 Pulse 5a) on 12 V battery-fed ECUs. IC Role / Device Role / Timing Role: Shunt clamping element placed between battery rail and local regulator input. Use Value: Limits voltage to ≤64.5 V during 120 V/100 ms transients, preventing LDO damage and MCU brownout. |
Use Scenario: Protecting analog outputs of pressure/temperature sensors exposed to ESD in factory automation. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) parallel clamp on 0–5 V sensor output line. Use Value: Clamps ±8 kV contact ESD (IEC 61000-4-2) within <1 ns while adding <0.5 pF parasitic capacitance. |
| DC-DC Converter Input Stage | RS-485 Transceiver Bus Line Protection |
|
Use Scenario: Guarding buck converter input against inductive switching spikes from relay coils or solenoids. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of input filter capacitor and controller. Use Value: Absorbs 600 W surge energy without latch-up, maintaining regulation during 50 V/100 µs transients. |
Use Scenario: Safeguarding RS-485 transceivers (e.g., SN65HVD230) against cable discharge events in building control networks. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS used in split-rail configuration (A/GND/B). Use Value: Provides symmetric ±64.5 V clamping on both differential lines, preserving common-mode noise rejection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40AHM3_A/H | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free material compliance is required for end-product certification. | Direct substitution where halogen-free bill-of-materials is mandated (e.g., EU medical devices). |
| SMAJ40AHE3/A | Same VWM/VC but lower PPPM (400 W) and smaller SMA (DO-214AC) package (3.5 mm × 4.5 mm vs. 4.57 mm × 3.94 mm). | Lower surge handling; suitable only for consumer-grade or non-automotive applications with reduced threat levels. | Use only if space-constrained layout prohibits SMB footprint and surge requirements are ≤400 W. |
Compared with SMBJ40AHE3_A/H, the HM3 variant offers identical protection performance with halogen-free construction, while the SMAJ40AHE3/A trades 33 % lower surge capacity and smaller size for cost-sensitive, non-automotive designs.
Availability
SMBJ40AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and DC-DC converter prototyping requiring stable component supply and AEC-Q101 traceability.
Supply support for SMBJ40AHE3_A/H 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, thermal performance, and automotive qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be eliminated through AEC-Q101 validation and robust packaging.
FAQ
What is the clamping voltage of SMBJ40AHE3_A/H at its rated peak pulse current?
The SMBJ40AHE3_A/H has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current of 9.3 A using the standard 10/1000 µs waveform. This value is measured under defined test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads) and represents the upper voltage limit imposed on protected circuitry during surge events. The SMBJ40AHE3_A/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), making it suitable for under-hood automotive applications.
Is SMBJ40AHE3_A/H qualified for automotive use?
Yes, SMBJ40AHE3_A/H is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature operating life (HTOL), temperature cycling (TC), and electrostatic discharge (ESD) per the AEC-Q101 standard. This qualification confirms its suitability for automotive powertrain, body, and chassis applications where long-term reliability under thermal and mechanical stress is mandatory. The "HE3" suffix explicitly denotes RoHS-compliant and AEC-Q101 qualified construction, distinguishing it from commercial-grade variants.
What is the standoff voltage and how does it relate to system voltage selection for SMBJ40AHE3_A/H?
The standoff voltage (VWM) of SMBJ40AHE3_A/H is 40 V - the maximum continuous reverse voltage it can block without significant leakage (<1 µA). This value is selected to provide ≥10 % margin above nominal 36 V systems (e.g., 24 V battery + load dump) and ≥20 % margin above 33 V regulated rails. Engineers must ensure that the system's maximum steady-state voltage never exceeds VWM, as sustained operation above this level risks thermal runaway. The SMBJ40AHE3_A/H is therefore ideal for 24 V/36 V automotive and industrial power distribution networks.
Does SMBJ40AHE3_A/H have bidirectional capability?
No, SMBJ40AHE3_A/H is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only when the cathode is positive relative to the anode - i.e., during positive transients on the protected line referenced to ground. For bidirectional protection (e.g., AC lines or differential buses), the "CA" variant (e.g., SMBJ40CAHE3_A/H) must be used. Using SMBJ40AHE3_A/H in bidirectional configurations will result in forward conduction and potential damage during negative excursions.
What is the thermal resistance and how does it affect SMBJ40AHE3_A/H layout?
The SMBJ40AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended pad layout (0.2" × 0.2" copper pads per terminal). This means each watt of sustained power dissipation raises junction temperature by ~100 °C above ambient. Since its rated power dissipation (PD) is 5.0 W at 50 °C ambient, layout must maximize copper area and thermal vias to avoid exceeding the 150 °C maximum junction temperature. The SMBJ40AHE3_A/H datasheet specifies exact pad dimensions (0.085" × 0.220") to achieve this RθJA value.
SMBJ40AHE3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 9.3A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ40AHE3_A/H FAQ
1.How can I place an order for SMBJ40AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40AHE3_A/H 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 SMBJ40AHE3_A/H reliable?
The price and inventory of SMBJ40AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ40AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40AHE3_A/H?
SMBJ40AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40AHE3_A/H 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 SMBJ40AHE3_A/H?
For technical support, including SMBJ40AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40AHE3_A/H requirements.
6.How does Aetrix verify that SMBJ40AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ40AHE3_A/H 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 SMBJ40AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ40AHE3_A/H?
All SMBJ40AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40AHE3_A/H, 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 SMBJ40AHE3_A/H part is unused and in its original packaging.
Return procedure for SMBJ40AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40AHE3_A/H Tags
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