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Vishay General Semiconductor - Diodes Division SMBJ33CAHE3_A/I
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- Part No.:
- SMBJ33CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CAHE3_A/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,249
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Product details
Overview
SMBJ33CAHE3_A/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust ESD and surge protection on signal/power lines. It features a 33 V stand-off voltage (VWM), 53.3 V maximum clamping voltage (VC) at 11.3 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), commonly deployed to protect MOSFET gates, sensor interfaces, and industrial I/O lines against lightning-induced transients.
For engineers reviewing the SMBJ33CAHE3_A/I datasheet, SMBJ33CAHE3_A/I pinout, SMBJ33CAHE3_A/I application, or SMBJ33CAHE3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and compliance with UL 497B for telecom and automotive interface protection.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ at 33 V), but switches to low-impedance conduction within <1 ps when reverse or forward voltage exceeds its breakdown threshold (VBR = 36.7–40.6 V). Its bidirectional architecture ensures symmetrical clamping in both polarities without polarity marking.
It delivers 600 W surge handling per 10/1000 µs waveform at TA = 25 °C, derating linearly above 25 °C per Fig. 2, with junction temperature limited to 150 °C and storage range spanning −55 to +150 °C. The glass-passivated junction and matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse working voltage before leakage exceeds 1 µA; defines safe operating margin below clamping onset. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - Verified breakdown range ensuring consistent turn-on across production lots and temperature. |
| VC @ IPPM | 53.3 V at 11.3 A - Clamping voltage during 10/1000 µs surge; determines maximum stress imposed on protected ICs. |
| PPPM | 600 W - Peak transient power dissipation capability; enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω). |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial control enclosures. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs PCB thermal pad design. |
| AEC-Q101 | Qualified - Validated for automotive applications including engine control modules and body electronics per stress test requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), cathode band omitted per bidirectional design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Conducts surge current when voltage at this terminal falls >36.7 V below cathode; symmetric with cathode in bidirectional mode. |
| Cathode | Transient current entry (positive polarity) | Conducts surge current when voltage at this terminal rises >36.7 V above anode; identical clamping behavior to anode terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions eliminates need for polarity-aware layout and enables single-device protection of AC-coupled or differential lines. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 4 kV (2 Ω source impedance) without degradation when mounted per recommended pad layout. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD-HBM ≥ 8 kV - suitable for CAN, LIN, and sensor front-end protection. |
| Low clamping ratio | VC/VWM = 1.62 - minimizes overvoltage stress on downstream components compared to higher-ratio TVS devices. |
| MSL Level 1 | Rated for unlimited floor life at ≤30 °C/85 % RH; compatible with standard SMT reflow profiles peaking at 260 °C. |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) in engine coolant temperature sensors exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt clamping element placed directly at connector entry point to divert transients before reaching precision DAC or op-amp circuitry. Use Value: Limits voltage excursion to ≤53.3 V during 10/1000 µs surges, preserving 12-bit ADC accuracy and preventing latch-up in signal conditioning ICs. |
Use Scenario: Safeguarding digital input channels on programmable logic controller (PLC) modules connected to 24 V DC field wiring subject to inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and ground to clamp both positive and negative transients induced by relay coil de-energization. Use Value: Enables reliable operation under repeated 1 kV/500 Ω surge events per IEC 61000-4-4, reducing field failure rates in factory automation systems. |
| Telecom Line Interface | Consumer Appliance Motor Control |
|
Use Scenario: Protecting RS-485 transceiver pins in networked building management systems where long cable runs act as antennas for EFT and surge coupling. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) bidirectional clamp installed adjacent to transceiver to suppress common-mode transients without distorting data signals. Use Value: Maintains signal integrity up to 10 Mbps while meeting UL 497B requirements for telecom protector classification (QVGQ2). |
Use Scenario: Shielding microcontroller GPIOs driving brushed DC motor H-bridges in smart home appliances from back-EMF spikes during commutation. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) shunt device placed across motor terminals and/or MCU driver outputs to absorb inductive energy. Use Value: Prevents destructive gate oxide breakdown in N-channel MOSFETs and eliminates false resets caused by voltage overshoot exceeding MCU absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA-E3/52 | Commercial-grade (non-AEC-Q101), same VWM/VC/PPPM, RoHS-compliant, packaged in 7" tape. | Lacks automotive qualification; suitable for consumer electronics or non-safety-critical industrial use. | Select when AEC-Q101 is not required and cost sensitivity outweighs qualification needs. |
| SMCJ33CAHE3_A/I | Same electrical specs but in larger SMC (DO-214AB) package with higher PPPM (1500 W) and lower RθJA (50 °C/W). | Better thermal performance and surge margin; requires larger PCB footprint and different pad layout. | Choose when system-level surge testing exceeds 600 W or sustained ambient temperatures exceed 85 °C. |
Compared with SMBJ33CAHE3_A/I, SMBJ33CA-E3/52 offers identical clamping performance at lower qualification cost, while SMCJ33CAHE3_A/I provides higher surge headroom and improved thermal management at the expense of board space - enabling trade-offs between qualification assurance, thermal design, and layout constraints.
Availability
SMBJ33CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line interface applications requiring stable component supply with AEC-Q101 traceability and long-term lifecycle support.
Supply support for SMBJ33CAHE3_A/I 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was developed to deliver high-power transient suppression in compact surface-mount packages for automotive, industrial, and communications infrastructure - balancing clamping speed, power density, and qualification rigor.
FAQ
What is the clamping voltage of SMBJ33CAHE3_A/I at its rated peak pulse current?
The SMBJ33CAHE3_A/I has a maximum clamping voltage (VC) of 53.3 V at its specified peak pulse current (IPPM) of 11.3 A, measured under the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and confirms the device's ability to limit transient overvoltage to a predictable level during surge events. The SMBJ33CAHE3_A/I maintains this clamping performance in both polarities due to its bidirectional construction.
Is SMBJ33CAHE3_A/I qualified for automotive applications?
Yes, SMBJ33CAHE3_A/I is AEC-Q101 qualified, as indicated by the "HE3" suffix and confirmed in Vishay's ordering information notes. It has passed stress tests including high-temperature operating life, temperature cycling, unbiased highly accelerated stress testing, and human-body model ESD ≥ 8 kV. This qualification makes SMBJ33CAHE3_A/I suitable for use in automotive subsystems such as body control modules, ADAS sensor interfaces, and powertrain communication lines where reliability under harsh environmental conditions is mandatory.
How does the bidirectional design of SMBJ33CAHE3_A/I affect PCB layout?
The bidirectional design of SMBJ33CAHE3_A/I eliminates polarity marking and allows placement without orientation constraints - simplifying automated assembly and reducing risk of misplacement. Unlike unidirectional TVS diodes, SMBJ33CAHE3_A/I requires no cathode band alignment, and its symmetrical clamping ensures equal protection against positive and negative transients on AC-coupled or floating signal paths. This enables direct integration into differential bus lines (e.g., CAN, RS-485) without additional routing considerations for directionality.
What is the thermal resistance of SMBJ33CAHE3_A/I, and how does it impact PCB design?
SMBJ33CAHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB material and natural convection cooling. To maintain junction temperature below 150 °C under worst-case 600 W surge duty, designers must ensure adequate copper area and avoid excessive local heating. For higher ambient or repetitive surge conditions, increasing pad size or adding internal thermal vias improves heat dissipation and extends device lifetime.
Does SMBJ33CAHE3_A/I meet UL safety standards?
Yes, SMBJ33CAHE3_A/I is recognized by Underwriters Laboratories under UL 497B for protectors, with file number E136766. This certification covers both unidirectional and bidirectional configurations and validates its suitability for use in telecommunications and industrial equipment requiring certified surge protection. The device's molding compound also meets UL 94 V-0 flammability rating, confirming resistance to flame propagation during fault conditions - a critical requirement for safety-compliant end equipment designs using SMBJ33CAHE3_A/I.
SMBJ33CAHE3_A/I 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 11.3A
- 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)
SMBJ33CAHE3_A/I FAQ
1.How can I place an order for SMBJ33CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CAHE3_A/I 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 SMBJ33CAHE3_A/I reliable?
The price and inventory of SMBJ33CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ33CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CAHE3_A/I?
SMBJ33CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CAHE3_A/I 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 SMBJ33CAHE3_A/I?
For technical support, including SMBJ33CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CAHE3_A/I requirements.
6.How does Aetrix verify that SMBJ33CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ33CAHE3_A/I 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 SMBJ33CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ33CAHE3_A/I?
All SMBJ33CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CAHE3_A/I, 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 SMBJ33CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMBJ33CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CAHE3_A/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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