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Vishay General Semiconductor - Diodes Division SMB8J33CA-M3/5B
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- Part No.:
- SMB8J33CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J33CA-M3/5B.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,737
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Product details
Overview
SMB8J33CA-M3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V clamping voltage (VC) at 15 A peak pulse current, and 800 W peak pulse power (10/1000 μs waveform), making it suitable for automotive sensor interface and industrial I/O line protection.
For engineers reviewing the SMB8J33CA-M3/5B datasheet, SMB8J33CA-M3/5B pinout, SMB8J33CA-M3/5B application, or SMB8J33CA-M3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), and compatibility with 0.2" × 0.2" copper pad layout per JEDEC standard.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
The SMB8J33CA-M3/5B is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (260 °C reflow peak), and delivers 1.0 μA max reverse leakage at 33 V - critical for low-power sensor front-ends where standby current must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before significant leakage begins |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - ensures reliable triggering above normal operating range |
| VC @ IPPM | 53.3 V at 15 A - limits downstream voltage stress during 10/1000 μs surge events |
| PPPM | 800 W - sustains high-energy transients common in automotive load-dump or inductive switching |
| ID @ VWM | 1.0 μA - preserves signal integrity and battery life in always-on sensor circuits |
| TJ max | +150 °C - supports under-hood automotive deployment without derating |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
Two-terminal SMB (DO-214AA) package with no polarity marking for bidirectional operation; terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Identical bidirectional terminals enable placement without orientation check - simplifies PCB layout and AOI inspection |
| Case (exposed cathode band absent) | Mechanical mounting only | No electrical connection; case serves solely as thermal mass and mechanical anchor - no grounding requirement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness - required for engine control, ADAS, and body electronics |
| Halogen-free & RoHS-compliant (M3) | Meets EU Directive 2011/65/EU and JEDEC JS709E - eliminates brominated flame retardants for safer end-of-life processing |
| Low-profile SMB package | Height ≤ 2.20 mm - enables compact placement near connectors or ICs without interference with shields or enclosures |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60% RH - eliminates bake requirements prior to reflow, reducing manufacturing cost and risk |
| Glass-passivated junction | Stable VBR over lifetime and temperature - prevents parameter drift in harsh environments like industrial motor drives |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and temperature/pressure sensors from ISO 7637-2 pulse 1, 2a, and 5a transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Maintains 33 V stand-off while clamping to 53.3 V - keeps protected ICs within absolute maximum ratings during 100 V/500 ms load dump events. | Use Scenario: Safeguarding 4–20 mA current loop inputs in programmable logic controllers against field-wiring induced surges and ground potential differences. IC Role / Device Role / Timing Role: Primary overvoltage clamp across input terminals, coordinated with series current-limiting resistor and downstream TVS array. Use Value: 800 W peak power rating absorbs repetitive 1 kV/500 Ω surge pulses per IEC 61000-4-5 without degradation - extends field service life. |
| Telecom Line Card Protection | Consumer Appliance Motor Control |
Use Scenario: Shielding Ethernet PHY interfaces and DSL line drivers from lightning-induced surges entering via RJ-45 jacks in network edge equipment. IC Role / Device Role / Timing Role: First-stage protector in multi-level architecture, handling bulk energy before secondary GDT or polymer-based devices. Use Value: 15 A peak pulse current capacity and 53.3 V clamping ensure Ethernet PHYs (e.g., DP83867) remain within 3.3 V or 2.5 V supply rail tolerances during fast-rising transients. | Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers connected to microcontroller GPIOs or Hall-effect sensors. IC Role / Device Role / Timing Role: Localized clamp across motor coil terminals or sensor supply rails to prevent latch-up or reset events in MCU peripherals. Use Value: Sub-ns response time and 1.0 μA leakage at 33 V prevent false triggering and preserve sleep-mode current budgets in battery-backed appliance controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA-M3/5B | Same SMB package, identical VWM/VBR/VC specs, but 1000 W PPPM (unidirectional rating only; bidirectional rating not specified in datasheet) | Not AEC-Q101 qualified; intended for commercial-grade systems only | Select when automotive qualification is unnecessary and higher unidirectional surge margin is needed |
| SMAJ33CA-M3/5B | Smaller SMA (DO-214AC) package; same electrical specs but lower 400 W PPPM (bidirectional) and higher thermal resistance (RθJA = 110 °C/W) | Limited to lower-duty-cycle surges due to reduced power handling and thermal performance | Choose for space-constrained consumer designs where 800 W is excessive and cost is prioritized |
Compared with SMBJ33CA-M3/5B and SMAJ33CA-M3/5B, the SMB8J33CA-M3/5B uniquely combines AEC-Q101 qualification, 800 W bidirectional surge rating, and SMB thermal performance - making it the only option validated for automotive under-hood analog front-ends requiring both reliability and symmetrical clamping.
Availability
SMB8J33CA-M3/5B is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC analog inputs, and telecom line card protection requiring stable component supply across extended production lifecycles.
Supply support for SMB8J33CA-M3/5B 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The SMB8J series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, bidirectional surge suppression in AEC-Q101-compliant automotive subsystems and ruggedized industrial controls.
FAQ
What is the clamping voltage of SMB8J33CA-M3/5B at its rated peak pulse current?
The SMB8J33CA-M3/5B has a maximum clamping voltage (VC) of 53.3 V at 15 A peak pulse current (IPPM), measured using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range (-55 °C to +150 °C) and ensures protected downstream ICs remain within safe voltage margins during surge events. The SMB8J33CA-M3/5B achieves this with low incremental surge resistance inherent to its glass-passivated junction design.
Is SMB8J33CA-M3/5B suitable for automotive applications?
Yes, SMB8J33CA-M3/5B is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its M3 suffix denotes halogen-free, RoHS-compliant construction, and its SMB (DO-214AA) package meets MSL Level 1 for lead-free reflow. The SMB8J33CA-M3/5B is commonly deployed in engine control units, ADAS camera modules, and body control modules where bidirectional transient immunity is required per ISO 7637-2 and ISO 16750-2 standards.
How does the SMB8J33CA-M3/5B differ from unidirectional variants like SMB10J33A-M3/5B?
The SMB8J33CA-M3/5B is bidirectional with symmetrical clamping in both polarities, whereas SMB10J33A-M3/5B is unidirectional and conducts only in reverse bias. The SMB8J33CA-M3/5B has an 800 W peak pulse power rating (bidirectional), while SMB10J33A-M3/5B offers 1000 W (unidirectional). Both share identical VWM (33 V), VBR (36.7–40.6 V), and VC (53.3 V), but the SMB8J33CA-M3/5B is preferred for AC-coupled or differential signal lines where polarity cannot be assumed.
What is the maximum reverse leakage current for SMB8J33CA-M3/5B at its stand-off voltage?
The SMB8J33CA-M3/5B exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 33 V stand-off voltage (VWM), tested at 25 °C. This ultra-low leakage preserves signal fidelity and minimizes quiescent power draw in always-on sensor interfaces - critical for battery-powered automotive telematics and industrial wireless nodes. Leakage remains below 5.0 μA up to +125 °C per datasheet characterization.
Does SMB8J33CA-M3/5B require orientation-specific PCB placement?
No, SMB8J33CA-M3/5B does not require orientation-specific placement because it is a bidirectional TVS diode with symmetrical terminal characteristics. Unlike unidirectional types that feature a cathode band, the SMB8J33CA-M3/5B has no polarity marking on the SMB (DO-214AA) package. This eliminates assembly errors and simplifies automated optical inspection (AOI) - a key advantage in high-volume automotive module production where the SMB8J33CA-M3/5B is frequently used.
SMB8J33CA-M3/5B 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):
- 15A
- Power - Peak Pulse:
- 800W
- 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 (SMBJ)
SMB8J33CA-M3/5B FAQ
1.How can I place an order for SMB8J33CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J33CA-M3/5B 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 SMB8J33CA-M3/5B reliable?
The price and inventory of SMB8J33CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J33CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J33CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J33CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J33CA-M3/5B?
SMB8J33CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J33CA-M3/5B 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 SMB8J33CA-M3/5B?
For technical support, including SMB8J33CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J33CA-M3/5B requirements.
6.How does Aetrix verify that SMB8J33CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J33CA-M3/5B 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 SMB8J33CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J33CA-M3/5B?
All SMB8J33CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J33CA-M3/5B, 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 SMB8J33CA-M3/5B part is unused and in its original packaging.
Return procedure for SMB8J33CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J33CA-M3/5B Tags
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