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Vishay General Semiconductor - Diodes Division SMBJ33CAHE3_B/I
- Part No.:
- SMBJ33CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CAHE3_B/I.pdf
- Description:
- 600W,33V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,577
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Product details
Overview
SMBJ33CAHE3_B/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features 33 V standoff voltage (VWM), 53.3 V maximum clamping voltage at 11.3 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), protecting MOSFETs, ICs, and sensor interfaces in industrial and telecom systems.
For engineers reviewing the SMBJ33CAHE3_B/I datasheet, SMBJ33CAHE3_B/I pinout, SMBJ33CAHE3_B/I application, or SMBJ33CAHE3_B/I equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, low clamping ratio (VC/VWM ≈ 1.62), AEC-Q101 qualification, and MSL Level 1 reflow compatibility are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) ranging from 36.7 V to 40.6 V at 1 mA test current and reverse leakage ≤1.0 µA at 33 V standoff. Its junction capacitance is not specified in the datasheet, but thermal resistance (RθJA = 100 °C/W) and fast response time (<1 ns) enable effective suppression of lightning-induced surges and inductive switching transients.
The device uses glass-passivated silicon junction technology, supports repetitive surge duty cycle of 0.01 %, and maintains stable clamping performance up to +150 °C junction temperature. Its AEC-Q101 qualification confirms suitability for automotive electronics environments where reliability under thermal cycling and mechanical stress is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - Confirmed breakdown threshold ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 53.3 V at 11.3 A - Clamping voltage limits transient energy delivered to downstream components during 10/1000 µs surge. |
| PPPM | 600 W - Peak pulse power handling capability with standard 10/1000 µs waveform; enables protection against IEC 61000-4-5 Level 4 surges. |
| TJ max | +150 °C - Maximum junction temperature rating supports operation in high-ambient industrial and automotive under-hood environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow soldering (MSL Level 1, 260 °C peak). |
| Qualification | AEC-Q101 qualified - Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals with cathode/anode roles interchangeable depending on applied voltage polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity event) | Accepts surge current when voltage at this terminal drops ≥36.7 V below cathode; enables bidirectional clamping without external orientation constraints. |
| Cathode | Transient current entry (positive polarity event) | Accepts surge current when voltage at this terminal rises ≥36.7 V above anode; completes symmetrical clamping path for AC or floating-line protection. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity requirements for industrial and telecom equipment. |
| AEC-Q101 qualification | Validates long-term reliability in automotive ECUs, body control modules, and ADAS sensor interfaces subject to harsh thermal and vibration profiles. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage stress on protected ICs by limiting clamped voltage to just 62 % above rated standoff level. |
| MSL Level 1 moisture sensitivity | Permits unlimited floor life and standard reflow profile (peak 260 °C) without baking, reducing manufacturing complexity and cost. |
| Glass-passivated junction | Improves long-term stability and reduces parameter drift under thermal cycling and humidity exposure versus epoxy-passivated alternatives. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O lines from inductive kickback during relay or solenoid switching in PLCs and HVAC controllers. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across power supply rails or signal lines to limit transient excursions within safe operating area of downstream logic. Use Value: Prevents latch-up and permanent damage to 3.3 V/5 V MCUs and gate drivers by clamping spikes to ≤53.3 V while dissipating 600 W peak energy. |
Use Scenario: Surge suppression on LIN bus lines and sensor inputs (e.g., ambient temperature, door position) exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-clamp TVS deployed directly at connector interface to shunt transients before entering AEC-Q100 qualified MCU or analog front-end. Use Value: Maintains signal integrity during 12 V system surges up to ±100 V by activating within <1 ns and holding clamped voltage below IC absolute maximum ratings. |
| Telecom Power Feeds | Consumer Sensor Hubs |
Use Scenario: Input-stage protection for PoE-powered devices (e.g., IP cameras, VoIP phones) subjected to lightning-induced common-mode surges on Ethernet pairs. IC Role / Device Role / Timing Role: Bidirectional TVS connected between differential pair and ground to suppress mode-converted transients without disrupting DC bias or data integrity. Use Value: Withstands repeated 600 W surges while maintaining ≤1.0 µA leakage at 33 V, ensuring minimal impact on PoE detection and classification circuits. |
Use Scenario: ESD protection for I²C/SPI lines connecting environmental sensors (humidity, pressure) to host MCU in smart home hubs and wearables. IC Role / Device Role / Timing Role: Low-capacitance-optimized TVS (typical CJ not specified but consistent with SMB family <100 pF) placed at sensor connector to absorb HBM ±8 kV discharges. Use Value: Provides fail-safe protection without signal distortion or timing skew due to symmetrical clamping and sub-nanosecond response. |
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 | Same electrical specs and SMB package; RoHS-compliant commercial grade (non-AEC-Q101 qualified); lead finish matte tin, MSL Level 1. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and lifecycle assurance is not needed. |
| SAC33CA | Same VWM (33 V) and VC (53.3 V), but in smaller SOD-123 package (lower PPPM = 400 W); unidirectional/bidirectional variants available. | Lower surge handling limits use to lower-energy applications (e.g., USB port ESD only); not suitable for IEC 61000-4-5 Level 4. | Choose for space-constrained PCBs where peak surge threat is limited to HBM/IEC 61000-4-2, not line surges. |
Compared with SMBJ33CAHE3_B/I, SMBJ33CA-E3/52 offers identical clamping performance without automotive qualification, while SAC33CA trades 33 % lower peak power for 40 % smaller footprint-making the original optimal for AEC-Q101–mandated, high-surge industrial and automotive applications.
Availability
SMBJ33CAHE3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, AEC-Q101 traceability, and MSL Level 1 reflow compatibility.
Supply support for SMBJ33CAHE3_B/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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets high-reliability transient suppression in automotive, industrial, and telecom infrastructure, engineered for robust surge handling, low clamping voltage, and seamless integration into automated SMT assembly lines.
FAQ
What is the clamping voltage of SMBJ33CAHE3_B/I at its rated peak pulse current?
The SMBJ33CAHE3_B/I has a maximum clamping voltage (VC) of 53.3 V at its rated peak pulse current (IPPM) of 11.3 A using the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for protected circuits. The clamping behavior remains consistent across both polarities due to its bidirectional design, and the SMBJ33CAHE3_B/I maintains this performance up to +150 °C junction temperature.
Is SMBJ33CAHE3_B/I suitable for automotive applications?
Yes, SMBJ33CAHE3_B/I is AEC-Q101 qualified, confirming its suitability for automotive applications including body control modules, infotainment interfaces, and sensor signal conditioning. The "HE3" suffix denotes RoHS-compliant and AEC-Q101–qualified construction, with validation across temperature cycling, humidity bias, and mechanical shock tests. Engineers deploying SMBJ33CAHE3_B/I in automotive designs benefit from guaranteed long-term reliability under real-world vehicle environmental stresses.
What does the "CA" suffix mean in SMBJ33CAHE3_B/I?
The "CA" suffix in SMBJ33CAHE3_B/I indicates a bidirectional configuration - meaning the device provides symmetrical transient voltage suppression for both positive- and negative-polarity surges without requiring polarity-aware placement. Unlike unidirectional "A" variants (e.g., SMBJ33A), the CA version has no cathode band marking and functions identically regardless of voltage polarity across its terminals, simplifying layout and enabling use on floating or AC-coupled lines. This is confirmed in the Vishay datasheet section "DEVICES FOR BIDIRECTION APPLICATIONS".
What is the standoff voltage (VWM) rating for SMBJ33CAHE3_B/I?
The standoff voltage (VWM) for SMBJ33CAHE3_B/I is 33 V - the maximum DC or continuous reverse operating voltage the device can withstand without entering breakdown. This rating ensures reliable operation in 24 V nominal systems (e.g., industrial controls, automotive subsystems) where normal operating voltages remain safely below the clamping threshold. The SMBJ33CAHE3_B/I maintains ≤1.0 µA reverse leakage at this voltage, minimizing standby power loss and avoiding false triggering in sensitive analog or digital circuits.
How does SMBJ33CAHE3_B/I compare to unidirectional SMBJ33AHE3_B/I in terms of application flexibility?
SMBJ33CAHE3_B/I offers greater application flexibility than unidirectional SMBJ33AHE3_B/I because it protects against voltage transients of either polarity without requiring correct orientation during placement. This eliminates risk of misassembly and enables use on differential lines, AC signals, or floating grounds where polarity is undefined. While both share identical VWM (33 V), VC (53.3 V), and PPPM (600 W), the SMBJ33CAHE3_B/I's bidirectional symmetry simplifies design reuse across multiple board variants and reduces inventory SKUs compared to maintaining separate anode/cathode versions.
SMBJ33CAHE3_B/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:
- Active
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ33CAHE3_B/I FAQ
1.How can I place an order for SMBJ33CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CAHE3_B/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_B/I reliable?
The price and inventory of SMBJ33CAHE3_B/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_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ33CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CAHE3_B/I?
SMBJ33CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CAHE3_B/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_B/I?
For technical support, including SMBJ33CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CAHE3_B/I requirements.
6.How does Aetrix verify that SMBJ33CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ33CAHE3_B/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_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ33CAHE3_B/I?
All SMBJ33CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CAHE3_B/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_B/I part is unused and in its original packaging.
Return procedure for SMBJ33CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CAHE3_B/I Tags
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