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Vishay General Semiconductor - Diodes Division SMB8J12CA-E3/52
- Part No.:
- SMB8J12CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J12CA-E3/52.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,556
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Product details
Overview
SMB8J12CA-E3/52 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 12 V standoff voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 19.9 V clamping voltage (VC) at 40.2 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - used to safeguard automotive sensor interfaces and industrial I/O circuits against ESD and load-switching transients.
For engineers reviewing the SMB8J12CA-E3/52 datasheet, SMB8J12CA-E3/52 pinout, SMB8J12CA-E3/52 application, or SMB8J12CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.45), RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ps to transient overvoltages and diverting surge current away from downstream ICs. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<5 µA at VWM), while the unidirectional/bidirectional family architecture enables symmetrical clamping for AC-coupled or floating signal paths.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and delivers 800 W peak pulse power under standardized 10/1000 µs waveform conditions when mounted on minimum recommended 0.2" × 0.2" copper pads - enabling robust protection in space-constrained automotive and industrial PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - guaranteed breakdown threshold defining turn-on precision |
| VC @ IPPM | 19.9 V at 40.2 A - clamping voltage limiting stress on protected circuit during 10/1000 µs surge |
| PPPM | 800 W - peak transient energy absorption capacity under standard waveform |
| ID @ VWM | ≤5 µA - ultra-low reverse leakage preserving signal integrity in high-impedance nodes |
| TJ max | +150 °C - extended thermal rating supporting under-hood automotive deployment |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity unmarked for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (during positive half-cycle) | Connects to line being protected; conducts when voltage exceeds +VC |
| Cathode | Transient current sink (during negative half-cycle) | Connects to line being protected; conducts when voltage falls below -VC - symmetric bidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled or floating differential signals without polarity constraints |
| AEC-Q101 qualification | Validates suitability for automotive applications including engine control, ADAS sensors, and infotainment I/O |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during surge events, reducing risk of latch-up in protected ICs |
| MSL Level 1 rating | Supports lead-free reflow assembly without moisture-induced popcorn failure |
| Glass-passivated junction | Ensures long-term parameter stability and resistance to humidity-induced degradation |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/FlexRay transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point to clamp surges before reaching signal conditioning circuitry. Use Value: Maintains signal fidelity with ≤5 µA leakage at 12 V and limits transient voltage to ≤19.9 V during 40.2 A surges - preventing damage to 3.3 V/5 V microcontrollers and ADC front-ends. | Use Scenario: Safeguarding PLC digital input modules against field-wiring induced transients from relay coils and motor drives. IC Role / Device Role / Timing Role: Bidirectional voltage clamp on 24 V DC input lines, absorbing repetitive switching spikes without degradation. Use Value: Delivers 800 W peak pulse power handling and -55 °C to +150 °C operation - ensuring uptime in factory-floor environments with wide ambient swings. |
| USB/Serial Port ESD Protection | Power Supply Rail Clamping |
Use Scenario: Secondary-level ESD protection on RS-485, RS-232, or USB 2.0 data lines in industrial gateways and edge devices. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) shunt element placed after primary filtering to suppress contact discharge up to ±15 kV per IEC 61000-4-2. Use Value: Low capacitance (typ. <100 pF at 0 V) avoids signal integrity loss on 10 Mbps+ serial links while clamping to 19.9 V. | Use Scenario: Overvoltage clamping on 12 V auxiliary rails feeding microcontrollers and communication ICs in automotive body electronics. IC Role / Device Role / Timing Role: Standoff-rated (12 V) shunt protector that remains non-conductive during normal operation but activates instantly during battery dump events. Use Value: Withstands 100 A surge current (IFSM) and maintains 12 V nominal operation - compatible with ISO 16750-2 load-dump test profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA-E3/52 | 1000 W PPPM (unidirectional variant); same VWM/VBR/VC but higher power rating | Unidirectional only; unsuitable for AC or floating signal paths requiring symmetrical clamping | Select SMBJ12CA-E3/52 only if protecting DC-biased lines where polarity is fixed and higher surge margin is required |
| SMAJ12CA-E3/52 | 400 W PPPM; SMA (DO-214AC) package with lower thermal resistance (RθJA = 65 °C/W) | Lower surge capacity; smaller footprint but reduced pad area limits heat dissipation under repeated transients | Choose SMAJ12CA-E3/52 for cost-sensitive consumer designs with moderate surge exposure and tighter board space |
Compared with SMBJ12CA-E3/52 and SMAJ12CA-E3/52, SMB8J12CA-E3/52 uniquely balances 800 W bidirectional clamping, AEC-Q101 qualification, and SMB package manufacturability - making it optimal for automotive and industrial signal-line protection where polarity independence and reliability are mandatory.
Availability
SMB8J12CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O modules, USB/serial port ESD protection, and 12 V power rail clamping requiring stable component supply across production lifecycles.
Supply support for SMB8J12CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-power-density, AEC-Q101-qualified transient suppression in automotive and harsh-environment industrial systems.
FAQ
What is the clamping voltage of SMB8J12CA-E3/52 and how does it protect downstream components?
The SMB8J12CA-E3/52 has a maximum clamping voltage (VC) of 19.9 V at 40.2 A peak pulse current (IPPM) under 10/1000 µs waveform. This limits the voltage seen by protected ICs during surge events - for example, keeping a 5 V microcontroller's I/O pin below destructive thresholds. Its low VC/VBR ratio (~1.45) ensures minimal overshoot, directly reducing stress on sensitive semiconductor junctions in automotive and industrial applications.
Is SMB8J12CA-E3/52 suitable for automotive applications, and what qualifications does it hold?
Yes, SMB8J12CA-E3/52 is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix HE3 (RoHS-compliant, AEC-Q101) or HM3 (halogen-free, AEC-Q101). It passes stress tests including temperature cycling, high-temperature reverse bias (HTRB), and accelerated moisture resistance - validating its reliability in under-hood and chassis-mounted electronic control units per ISO/TS 16949 requirements.
How does the bidirectional configuration of SMB8J12CA-E3/52 differ from unidirectional TVS diodes like SMBJ12CA-E3/52?
The SMB8J12CA-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, sensor bridges). In contrast, SMBJ12CA-E3/52 is unidirectional and only clamps positive excursions - requiring external polarity management. The bidirectional design eliminates need for orientation-aware placement and simplifies layout for noise-prone bidirectional buses.
What PCB layout considerations are critical for optimal performance of SMB8J12CA-E3/52?
For SMB8J12CA-E3/52, mount on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 800 W PPPM and manage thermal dissipation. Keep traces short and direct between the TVS and protected node - avoid vias or long routing that increases inductance and degrades clamping response. Use ground planes beneath pads to enhance heat spreading, and ensure no silkscreen or solder mask encroachment on active areas per Vishay's DO-214AA outline.
Does SMB8J12CA-E3/52 meet RoHS and halogen-free compliance requirements?
Yes, SMB8J12CA-E3/52 carries the "E3" suffix, indicating full RoHS compliance per EU Directive 2011/65/EU and exemption 7a. It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE. While not halogen-free (which requires "HM3" suffix), its matte tin terminations meet JESD 201 Class 2 whisker resistance and J-STD-002 solderability standards - suitable for commercial and automotive applications where halogen content is not mandated.
SMB8J12CA-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 40.2A
- 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 (SMB)
SMB8J12CA-E3/52 FAQ
1.How can I place an order for SMB8J12CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J12CA-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 SMB8J12CA-E3/52 reliable?
The price and inventory of SMB8J12CA-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 SMB8J12CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J12CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J12CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J12CA-E3/52?
SMB8J12CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J12CA-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 SMB8J12CA-E3/52?
For technical support, including SMB8J12CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J12CA-E3/52 requirements.
6.How does Aetrix verify that SMB8J12CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J12CA-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 SMB8J12CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J12CA-E3/52?
All SMB8J12CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J12CA-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 SMB8J12CA-E3/52 part is unused and in its original packaging.
Return procedure for SMB8J12CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J12CA-E3/52 Tags
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