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Vishay General Semiconductor - Diodes Division SMBJ40HE3/52
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- Part No.:
- SMBJ40HE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40HE3/52.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,300
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Product details
Overview
SMBJ40HE3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 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 on ICs, MOSFETs, and sensor signal lines in industrial and telecom systems.
For engineers reviewing the SMBJ40HE3/52 datasheet, SMBJ40HE3/52 pinout, SMBJ40HE3/52 application, or SMBJ40HE3/52 equivalent, key selection criteria include clamping performance under 10/1000 µs surge, unidirectional polarity with cathode band marking, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when transient voltage exceeds its VBR threshold. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, enabling fast response time (<1 ns) and repeatable protection across surge events.
The SMBJ40HE3/52 is rated for 150 °C maximum junction temperature, supports 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), and meets J-STD-020 MSL Level 1 with 260 °C reflow peak - confirming suitability for high-reliability commercial and automotive-grade applications where AEC-Q101 compliance is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC signal line operating margin. |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC @ IPPM | 64.5 V at 9.3 A - Clamped voltage seen by downstream circuitry during 10/1000 µs surge; limits stress on protected ICs. |
| PPPM | 600 W - Peak pulse power handling capability with 10/1000 µs waveform; validates robustness against common lightning/inductive spikes. |
| IPPM | 9.3 A - Peak surge current supported at VC; correlates directly with system-level surge immunity level. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood or enclosed industrial environments. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs board-level thermal design requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified. Cathode indicated by molded band on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to ground or low-impedance return path; forms clamping loop with cathode during transient. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line (e.g., I/O, power rail); conducts avalanche current when VIN > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics requiring extended temperature and reliability assurance. |
| 600 W peak pulse power (10/1000 µs) | Provides industry-standard surge immunity per IEC 61000-4-5 Level 3 (1 kV line-to-ground), suitable for industrial fieldbus and telecom interfaces. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift. |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without moisture sensitivity concerns, reducing manufacturing risk and cost. |
| Low profile SMB package | 0.220" × 0.155" footprint with 0.086" height - fits dense PCB layouts while maintaining thermal dissipation via copper pad coupling. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O pins against back-EMF spikes from relay and solenoid switching in PLCs and servo controllers. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between MOSFET gate and source, limiting voltage overshoot to <65 V during turn-off. Use Value: Prevents gate oxide breakdown in 40 V-rated logic-level MOSFETs by clamping transients within safe VGS limits. | Use Scenario: Safeguarding LIN bus transceivers and sensor inputs (e.g., door latch, seat position) from battery dump and load-dump events. IC Role / Device Role / Timing Role: Standoff-connected TVS on LIN data line, conducting only during >40 V transients while remaining invisible during normal 12 V operation. Use Value: Maintains signal integrity below 40 V while suppressing 100 V/50 ms load-dump surges per ISO 7637-2 Pulse 5a. |
| Telecom Power Supply Inputs | Consumer Appliance Control Boards |
Use Scenario: Input-stage protection on 48 V telecom DC-DC converters exposed to lightning-induced surges on PoE or remote power feeds. IC Role / Device Role / Timing Role: Primary clamping element on secondary-side 48 V rail, shunting surge energy before it reaches regulation ICs and optocouplers. Use Value: Limits voltage excursion to ≤64.5 V during 600 W surges, preventing overvoltage shutdown or latch-up in PMICs. | Use Scenario: ESD and surge protection for touch panel MCU inputs and relay coil drivers in smart washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Localized TVS on 5 V/3.3 V I/O traces, activated only during >40 V transients (e.g., relay contact arcing). Use Value: Eliminates need for external series impedance or RC filtering, preserving signal rise time for capacitive touch sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40A-E3/52 | Commercial-grade (non-AEC-Q101), identical electrical specs and SMB package. | Lacks automotive qualification; not approved for under-hood or safety-critical modules. | Select when cost-sensitive industrial designs do not require automotive reliability validation. |
| SMCJ40AHE3/52 | Same VWM/VC but in larger SMC (DO-214AB) package; higher IPPM (15.2 A) and PPPM (1500 W). | Requires larger PCB area; suited for higher-energy surge environments (e.g., AC mains input stages). | Choose when system-level surge testing exceeds 600 W or layout allows SMC footprint. |
Compared with SMBJ40A-E3/52, the SMBJ40HE3/52 adds AEC-Q101 qualification without altering clamping behavior - critical for automotive Tier-1 suppliers. Against SMCJ40AHE3/52, it trades surge capacity for space-constrained placements where 600 W suffices and board real estate is premium.
Availability
SMBJ40HE3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power supply inputs, and consumer appliance control boards requiring stable component supply and AEC-Q101 traceability.
Supply support for SMBJ40HE3/52 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, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-volume surface-mount transient suppression in space-constrained, high-reliability applications - particularly where automated assembly, thermal stability, and standardized surge immunity (IEC 61000-4-5, ISO 7637-2) are mandatory.
FAQ
What is the clamping voltage of SMBJ40HE3/52 and how is it measured?
The SMBJ40HE3/52 has a maximum clamping voltage (VC) of 64.5 V, measured at a peak pulse current (IPPM) of 9.3 A using a 10/1000 µs double-exponential waveform. This value represents the highest voltage imposed on protected circuitry during a standardized surge event and is confirmed per ANSI/IEEE C62.35 test conditions. The SMBJ40HE3/52 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMBJ40HE3/52 AEC-Q101 qualified and what does that cover?
Yes, SMBJ40HE3/52 is AEC-Q101 qualified, as indicated by the "HE3" suffix. This qualification covers stress tests including high-temperature operating life (HTOL), temperature cycling, mechanical shock, and ESD (HBM ≥ 8 kV). It certifies the device for use in automotive electronic systems such as body control modules and infotainment interfaces where reliability under thermal and vibration stress is mandatory.
What is the difference between SMBJ40HE3/52 and SMBJ40A-E3/52?
The SMBJ40HE3/52 and SMBJ40A-E3/52 share identical electrical parameters (VWM, VBR, VC, PPPM) and SMB package dimensions, but differ in qualification: SMBJ40HE3/52 is AEC-Q101 qualified and RoHS-compliant, while SMBJ40A-E3/52 is commercial-grade only. Both use matte tin-plated leads and meet J-STD-002 solderability, but only SMBJ40HE3/52 is approved for automotive under-hood applications.
Can SMBJ40HE3/52 be used in bidirectional protection circuits?
No, SMBJ40HE3/52 is a unidirectional TVS diode, identifiable by its cathode band marking. For bidirectional protection, Vishay specifies the CA-suffix variant (e.g., SMBJ40CA). Using SMBJ40HE3/52 in reverse-biased configurations risks permanent damage, as it lacks symmetrical breakdown characteristics. Always verify polarity alignment during PCB layout to ensure anode connects to ground and cathode to the protected line.
What is the thermal resistance and recommended pad layout for SMBJ40HE3/52?
The SMBJ40HE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - the minimum recommended layout per Vishay's datasheet. Larger copper areas reduce RθJA and improve surge endurance; thermal vias beneath pads further enhance heat dissipation. The device is rated for 150 °C maximum junction temperature and MSL Level 1 reflow compatibility.
SMBJ40HE3/52 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:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 8.4A
- 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)
SMBJ40HE3/52 FAQ
1.How can I place an order for SMBJ40HE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40HE3/52 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 SMBJ40HE3/52 reliable?
The price and inventory of SMBJ40HE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40HE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ40HE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40HE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40HE3/52?
SMBJ40HE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40HE3/52 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 SMBJ40HE3/52?
For technical support, including SMBJ40HE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40HE3/52 requirements.
6.How does Aetrix verify that SMBJ40HE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ40HE3/52 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 SMBJ40HE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ40HE3/52?
All SMBJ40HE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40HE3/52, 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 SMBJ40HE3/52 part is unused and in its original packaging.
Return procedure for SMBJ40HE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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