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Vishay General Semiconductor - Diodes Division SMB8J12C-E3/52
- Part No.:
- SMB8J12C-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J12C-E3/52.pdf
- Description:
- TVS DIODE 12VWM 22VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,565
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Product details
Overview
SMB8J12C-E3/52 from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection on signal and power lines. It features 12 V stand-off voltage (VWM), 19.9 V maximum clamping voltage at 40.2 A peak pulse current, and 800 W peak pulse power rating with 10/1000 µs waveform. Used to protect automotive sensor interfaces, industrial I/O ports, and telecom line drivers against ESD and lightning-induced transients.
For engineers reviewing the SMB8J12C-E3/52 datasheet, SMB8J12C-E3/52 pinout, SMB8J12C-E3/52 application, or SMB8J12C-E3/52 equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<5 µA at 12 V), while the low incremental surge resistance supports consistent clamping under repetitive surges.
The device meets J-STD-020 MSL Level 1 moisture sensitivity and withstands peak reflow temperatures up to 260 °C. Thermal resistance from junction to ambient is 72 °C/W, requiring appropriate PCB copper area for sustained power dissipation up to 100 W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 12 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 13.3–14.7 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during transients |
| VC (Clamping Voltage) | 19.9 V at 40.2 A - Peak voltage seen by protected circuit during 10/1000 µs surge; limits stress on downstream ICs |
| PPPM (Peak Pulse Power) | 800 W - Energy-handling capacity for standardized 10/1000 µs surge waveform |
| ID (Reverse Leakage) | ≤5 µA at 12 V - Minimal standby current draw; avoids loading sensitive analog or low-power circuits |
| TJ max | 150 °C - Maximum junction temperature defining thermal derating envelope for sustained operation |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional configuration with no polarity marking. Cathode band absent; terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional surge path | Either terminal serves as input/output for transient energy; no DC polarity dependency |
| Case (body) | Thermal conduction path | DO-214AA molded body transfers heat to PCB copper pads; requires 5.0 mm × 5.0 mm minimum pad area per lead |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), and ungrounded sensor outputs without polarity concerns |
| AEC-Q101 qualification | Validated for automotive environments including engine control units, ADAS camera links, and infotainment interfaces |
| Glass passivated junction | Ensures stable VBR over lifetime and improved resistance to humidity-induced parameter drift |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 260 °C peak without baking or special handling |
| RoHS-compliant matte tin leads | Guarantees solderability per J-STD-002 and whisker resistance per JESD 201 Class 1A |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting wheel speed sensor or crankshaft position sensor signal lines from load dump and inductive switching transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bi-directional TVS placed between signal line and chassis ground to clamp ±20 V surges within 1 ns. Use Value: Prevents latch-up or damage to automotive-grade op-amps and comparators with 20 V absolute maximum ratings. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., SN65HVD230) in factory automation PLCs exposed to motor drive noise. IC Role / Device Role / Timing Role: Placed across A/B differential pair to suppress common-mode surges up to ±1 kV per IEC 61000-4-5. Use Value: Maintains data integrity by limiting differential voltage excursion to <40 V during 800 W surge events. |
| Telecom Line Driver Protection | Consumer Audio Input Stage |
Use Scenario: Shielding DSL or POTS line driver ICs from lightning-induced surges entering via outdoor copper pairs. IC Role / Device Role / Timing Role: Mounted at connector entry point, shunting surge energy to earth ground before reaching transformer-coupled front-end. Use Value: Achieves >30 kV ESD immunity (IEC 61000-4-2) and 10/700 µs surge survivability per ITU-T K.21. |
Use Scenario: Guarding analog audio inputs (e.g., 3.5 mm jack) in smart speakers against user-handling ESD and cable coupling transients. IC Role / Device Role / Timing Role: Connected between tip/ring and ground to clamp ±15 kV contact discharge without affecting 20 Hz–20 kHz signal fidelity. Use Value: Limits junction capacitance to <200 pF at 0 V bias, preserving high-frequency response and SNR above 10 kHz. |
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 | Same DO-214AA package and 12 V VWM, but rated for 1000 W uni-directional only (not bi-directional); lacks AEC-Q101 qualification | Restricted to DC-biased lines where polarity is fixed; unsuitable for AC or differential signal protection | Select only when uni-directional clamping suffices and automotive qualification is not required |
| SMCJ12CA-E3/52 | DO-214AB (SMC) package, same 12 V VWM and bi-directional function, but 1500 W PPPM rating and higher VC (23.2 V at 64.5 A) | Better suited for higher-energy surges (e.g., 4-pair Ethernet PoE+), but larger footprint increases board space and thermal mass | Choose when surge threat level exceeds 800 W or when PCB layout allows larger SMC package |
Compared with SMBJ12CA-E3/52 and SMCJ12CA-E3/52, SMB8J12C-E3/52 uniquely balances AEC-Q101 compliance, bi-directional symmetry, and compact SMB footprint-making it optimal for space-constrained automotive and industrial signal-line protection where polarity-agnostic clamping is mandatory.
Availability
SMB8J12C-E3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, and telecom line driver circuits requiring stable component supply and long-term lifecycle support.
Supply support for SMB8J12C-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 SMB8J series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in harsh automotive and industrial environments.
FAQ
What is the clamping voltage of SMB8J12C-E3/52 at its rated peak pulse current?
The SMB8J12C-E3/52 has a maximum clamping voltage (VC) of 19.9 V at 40.2 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMB8J12C-E3/52 maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMB8J12C-E3/52 suitable for automotive applications?
Yes, SMB8J12C-E3/52 is AEC-Q101 qualified and explicitly rated for automotive use, including engine bay and chassis-mounted modules. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility, and validated performance across thermal cycling, high-temperature reverse bias, and ESD stress tests. The SMB8J12C-E3/52 meets requirements for protecting CAN, LIN, and sensor signal lines in passenger vehicles and commercial trucks.
How does the bi-directional configuration of SMB8J12C-E3/52 affect PCB layout?
The SMB8J12C-E3/52 has no polarity marking and identical electrical behavior in both directions, eliminating orientation constraints during placement. PCB layout requires symmetric 5.0 mm × 5.0 mm copper pads per terminal to meet thermal and surge-current specifications. Unlike uni-directional TVS diodes, the SMB8J12C-E3/52 can be placed across differential pairs or AC-coupled lines without concern for anode/cathode alignment-reducing assembly errors and simplifying routing.
What is the maximum reverse leakage current for SMB8J12C-E3/52 at its stand-off voltage?
At the 12 V stand-off voltage (VWM), the SMB8J12C-E3/52 exhibits a maximum reverse leakage current (ID) of 5 µA at 25 °C. This low leakage ensures minimal loading on high-impedance sensor outputs or battery-backed circuits. Leakage remains below 10 µA up to +125 °C, supporting reliable operation in under-hood automotive environments where the SMB8J12C-E3/52 is commonly deployed.
Does SMB8J12C-E3/52 require derating at elevated ambient temperatures?
Yes, SMB8J12C-E3/52 must be derated above TA = 25 °C per Figure 2 in Vishay document 88422. Its peak pulse power drops linearly to 50% at +125 °C ambient, and its maximum non-repetitive surge current decreases proportionally. For continuous operation, thermal design must account for RθJA = 72 °C/W; at 85 °C ambient, the SMB8J12C-E3/52 supports ≤65 W pulse power without exceeding TJ = 150 °C.
SMB8J12C-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 22V
- Current - Peak Pulse (10/1000µs):
- 36.4A
- 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)
SMB8J12C-E3/52 FAQ
1.How can I place an order for SMB8J12C-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J12C-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 SMB8J12C-E3/52 reliable?
The price and inventory of SMB8J12C-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 SMB8J12C-E3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J12C-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J12C-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J12C-E3/52?
SMB8J12C-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J12C-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 SMB8J12C-E3/52?
For technical support, including SMB8J12C-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J12C-E3/52 requirements.
6.How does Aetrix verify that SMB8J12C-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J12C-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 SMB8J12C-E3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J12C-E3/52?
All SMB8J12C-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J12C-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 SMB8J12C-E3/52 part is unused and in its original packaging.
Return procedure for SMB8J12C-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J12C-E3/52 Tags
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