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Vishay General Semiconductor - Diodes Division SMBG33CA-E3/52
- Part No.:
- SMBG33CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG33CA-E3/52.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,204
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Product details
Overview
SMBG33CA-E3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for clamping ESD and surge transients on signal/power lines. It features 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), 11.3 A peak pulse current (IPPM), and 53.3 V maximum clamping voltage (VC) - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMBG33CA-E3/52 datasheet, SMBG33CA-E3/52 pinout, SMBG33CA-E3/52 application, or SMBG33CA-E3/52 equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.42), junction temperature range (−55 °C to +150 °C), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with identical VBR, VC, and leakage characteristics across reverse and forward directions. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance under repetitive 10/1000 μs transients at 0.01% duty cycle.
The device meets J-STD-020 MSL Level 1 (peak reflow 260 °C), supports 100 A non-repetitive forward surge (8.3 ms half-sine, unidirectional only - not applicable here), and exhibits typical junction-to-ambient thermal resistance of 100 °C/W when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - tight breakdown window ensures predictable turn-on during transients |
| VC @ IPPM | 53.3 V at 11.3 A - clamping voltage limits downstream IC stress during 600 W surge events |
| PPPM | 600 W - peak pulse power handling with 10/1000 μs waveform; validated for automotive load dump immunity |
| IPPM | 11.3 A - peak surge current capability derived from PPPM/VC; enables robust protection against IEC 61000-4-5 Level 3 surges |
| TJ range | −55 °C to +150 °C - extended junction temperature rating supports under-hood automotive and industrial environments |
| AEC-Q101 | Qualified - certified for automotive electronic systems per stress test requirements including HTGB, H3TRB, and TCT |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, bidirectional configuration with no polarity marking. Case dimensions: 6.48 mm × 3.94 mm × 2.41 mm (L × W × H); matte tin-plated leads, RoHS-compliant, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive polarity) | One terminal of symmetrical junction; conducts during positive transients relative to cathode reference |
| Cathode | Transient current entry (negative polarity) | Second terminal of symmetrical junction; conducts during negative transients - functionally identical to anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and leakage in both directions - eliminates need for polarity-aware PCB layout |
| 600 W surge rating | Validated with 10/1000 μs waveform at 0.01% duty cycle - meets ISO 7637-2 Pulse 3b and IEC 61000-4-5 requirements |
| AEC-Q101 qualification | Passed automotive reliability stress tests including high-temperature gate bias and temperature cycling - suitable for ADAS and body control modules |
| Low-profile SMBG package | Height ≤ 2.41 mm - enables compact placement near connectors and sensors without mechanical interference |
| Glass passivation | Stable junction characteristics over lifetime and temperature - prevents parameter drift in harsh industrial environments |
Applications
| Automotive Sensor Protection | Industrial Digital I/O |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ESD in engine control units. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector interface to limit transient energy entering MCU or PHY. Use Value: Clamps 53.3 V at 11.3 A while maintaining 33 V operating margin - prevents latch-up and oxide damage in 3.3 V/5 V sensor signal chains. | Use Scenario: Safeguarding PLC digital input channels exposed to inductive switching noise from solenoids and relays. IC Role / Device Role / Timing Role: Fast-response shunt protector across input terminals, diverting surge current away from optocoupler or level-shifter inputs. Use Value: Sub-1 ns response time and 53.3 V clamping ensure microcontroller GPIOs remain within absolute maximum ratings during 1 kV/500 A surge events. |
| Telecom Line Interface | Consumer USB/Display Port ESD |
Use Scenario: Shielding RS-485/RS-422 differential pairs in base station backhaul equipment from lightning-induced surges. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to ground, leveraging symmetrical breakdown for balanced clamping. Use Value: Matched VBR tolerance (±5.4%) preserves common-mode rejection ratio - avoids signal distortion during transient suppression. | Use Scenario: ESD protection for HDMI, USB 2.0, or DisplayPort signal lanes in set-top boxes and monitors. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at 0 V) bidirectional clamp placed adjacent to connector to absorb ±8 kV contact discharge. Use Value: 53.3 V clamping voltage prevents damage to 3.3 V SerDes receivers while maintaining signal integrity up to 480 Mbps. |
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 | Same VWM (33 V), but lower PPPM = 600 W (identical), higher VC = 53.3 V (same), slightly wider VBR range (36.7–42.2 V) | Also AEC-Q101 qualified; identical SMB (DO-214AA) footprint but 0.1 mm taller case height | Select SMBJ33CA if legacy board uses SMB footprint and thermal margin allows 100 °C/W RθJA |
| 1.5KE33CA | Higher PPPM = 1500 W, larger DO-201AD package, VC = 53.3 V (same), VBR = 36.7–42.2 V, not AEC-Q101 qualified | Used in non-automotive power supply inputs; incompatible with SMT automation due to axial leaded form factor | Choose 1.5KE33CA only for through-hole prototyping or high-energy AC line protection where AEC-Q101 is not required |
Compared with SMBG33CA-E3/52, SMBJ33CA offers identical electrical specs but differs in package outline and thermal profile, whereas 1.5KE33CA provides higher surge capacity at the cost of AEC-Q101 compliance and SMT compatibility - making SMBG33CA-E3/52 optimal for space-constrained, automotive-grade signal line protection.
Availability
SMBG33CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer display interface designs requiring stable component supply and AEC-Q101 assurance.
Supply support for SMBG33CA-E3/52 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBG series was developed specifically for high-reliability surface-mount transient suppression in automotive and industrial environments, prioritizing AEC-Q101 qualification, low-profile packaging, and precise bidirectional clamping performance.
FAQ
What is the clamping voltage of SMBG33CA-E3/52 at its rated peak pulse current?
The SMBG33CA-E3/52 has a maximum clamping voltage (VC) of 53.3 V at its rated peak pulse current (IPPM) of 11.3 A, measured with a 10/1000 μs waveform. This value is critical for ensuring downstream components like MCUs or transceivers remain within their absolute maximum voltage ratings during surge events. The SMBG33CA-E3/52 achieves this clamping performance while maintaining a VWM of 33 V and bidirectional symmetry.
Is SMBG33CA-E3/52 suitable for automotive applications?
Yes, SMBG33CA-E3/52 is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, ADAS sensors, and body electronics. Its −55 °C to +150 °C operating junction temperature range, glass-passivated junction, and MSL Level 1 reflow compatibility meet stringent automotive manufacturing and field reliability requirements. The SMBG33CA-E3/52 is listed in Vishay's AEC-Q101 qualified product portfolio with full test documentation.
Does SMBG33CA-E3/52 have polarity markings on the package?
No, SMBG33CA-E3/52 does not have polarity markings because it is a bidirectional TVS diode. Unlike unidirectional variants (e.g., SMBG33A), the CA suffix indicates symmetrical conduction in both directions, eliminating the need for cathode band identification. This simplifies PCB layout and reduces assembly errors in differential or AC-coupled signal paths where polarity awareness is unnecessary.
What is the thermal resistance of SMBG33CA-E3/52, and how does it affect layout?
The SMBG33CA-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB construction and dictates minimum copper area needed to avoid thermal runaway during repetitive surge events. Designers must adhere to Vishay's specified pad layout to maintain this RθJA - reducing pad size increases junction temperature and degrades long-term reliability of the SMBG33CA-E3/52.
How does SMBG33CA-E3/52 compare to unidirectional SMBG33A in terms of circuit protection?
SMBG33CA-E3/52 provides symmetrical clamping for both positive and negative transients, making it ideal for AC-coupled, differential, or floating signal lines (e.g., RS-485, CAN). In contrast, SMBG33A only clamps in reverse direction and conducts forward current - requiring external series blocking elements for bidirectional protection. The SMBG33CA-E3/52 eliminates that complexity, offering simpler, more robust protection with identical VWM, VBR, and VC specs in both polarities.
SMBG33CA-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG33CA-E3/52 FAQ
1.How can I place an order for SMBG33CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG33CA-E3/52 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 SMBG33CA-E3/52 reliable?
The price and inventory of SMBG33CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG33CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBG33CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG33CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG33CA-E3/52?
SMBG33CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG33CA-E3/52 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 SMBG33CA-E3/52?
For technical support, including SMBG33CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG33CA-E3/52 requirements.
6.How does Aetrix verify that SMBG33CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG33CA-E3/52 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 SMBG33CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBG33CA-E3/52?
All SMBG33CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG33CA-E3/52, 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 SMBG33CA-E3/52 part is unused and in its original packaging.
Return procedure for SMBG33CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG33CA-E3/52 Tags
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