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Vishay General Semiconductor - Diodes Division SMB8J12CAHE3_A/I
- Part No.:
- SMB8J12CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J12CAHE3_A/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,479
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Product details
Overview
SMB8J12CAHE3_A/I 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 stand-off voltage (VWM), 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 - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J12CAHE3_A/I datasheet, SMB8J12CAHE3_A/I pinout, SMB8J12CAHE3_A/I application, or SMB8J12CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low thermal resistance (RθJL = 20 °C/W), 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 transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior, while bidirectional symmetry enables protection of AC-coupled or differential lines without polarity constraints.
The device is rated for -55 °C to +150 °C operating junction temperature and meets MSL level 1 per J-STD-020 with 260 °C reflow peak. Its 72 °C/W junction-to-ambient thermal resistance requires careful PCB pad design - minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper per terminal - to sustain repetitive surge duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse voltage before clamping activation; defines safe operating margin for 12 V nominal systems |
| VBR min/max | 13.3 V / 14.7 V at 1.0 mA - verified breakdown threshold ensuring reliable turn-on above system overvoltage thresholds |
| VC @ IPPM | 19.9 V at 40.2 A - clamping voltage under full 10/1000 μs surge; limits downstream IC stress to sub-20 V during 800 W transient |
| PPPM | 800 W - peak pulse power handling with 10/1000 μs waveform; supports ISO 7637-2 Pulse 1/2/5a compliance in automotive environments |
| ID @ VWM | 5.0 μA - ultra-low leakage at stand-off voltage, minimizing standby power loss in battery-powered sensor nodes |
| TJ max | +150 °C - extended junction temperature rating enabling use in under-hood automotive modules and industrial enclosures |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical dual-terminal construction with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; bidirectional clamping allows connection across any two points needing voltage limiting without orientation check |
| Case (body) | Thermal and mechanical interface | Plastic molding meets UL 94 V-0; thermal path relies on copper pad area (min. 5.0 mm × 5.0 mm per terminal) to dissipate surge energy |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics including engine control units, ADAS sensors, and body controllers requiring long-term field reliability |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR ≈ 6.6 V) versus competing TVS devices, reducing voltage overshoot during fast-rising transients |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; compatible with high-throughput SMT assembly lines |
| Glass passivated junction | Ensures stable VBR over time and temperature, eliminating parameter drift seen in epoxy-passivated alternatives |
| Halogen-free RoHS-compliant (HM3 suffix) | Meets automotive environmental requirements and end-of-life recycling mandates without compromising electrical performance |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and jump-start surges in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt clamping element placed directly at connector entry point to divert >100 A transients away from sensitive front-end circuitry. Use Value: Maintains signal integrity under ISO 7637-2 Pulse 5a (12 V system, 170 V/100 ms) while surviving 1000+ surge events per AEC-Q101 test plan. | Use Scenario: Safeguarding PLC digital input modules against inductive kickback from solenoid valves and relay coils in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across isolated 24 V DC input lines, absorbing 800 W surges without polarity-dependent installation. Use Value: Eliminates need for external polarity-reversal protection components, reducing BOM count and PCB footprint in DIN-rail mounted controllers. |
| Consumer Power Adapter Input | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side overvoltage suppression in USB-C PD adapters and wireless charging base stations exposed to AC line transients. IC Role / Device Role / Timing Role: Fast-response TVS placed between secondary-side rectifier output and DC-DC controller input to limit voltage spikes during fault conditions. Use Value: Clamps 19.9 V within nanoseconds, preventing latch-up or gate oxide damage in synchronous rectifier MOSFETs and PWM controllers. | Use Scenario: Primary protection for Ethernet PHY interfaces and POTS line drivers in telecom access equipment subjected to lightning-induced surges. IC Role / Device Role / Timing Role: First-stage shunt device on RJ-45 magnetics secondary side, working with GDTs and series impedance to meet ITU-T K.20/K.21 immunity standards. Use Value: Provides precise 12 V standoff with minimal capacitance (<100 pF at 0 V), preserving signal integrity up to 100 Mbps without jitter degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CAHE3_A/I | 1000 W PPPM (unidirectional only); same VWM/VBR/VC but higher power rating and unidirectional polarity | Requires polarity-aware layout; unsuitable for AC or differential signal lines without external diode pairing | Select when higher single-polarity surge capacity is needed and board space allows orientation-sensitive placement |
| SMCJ12CAHE3_A/I | Larger SMC (DO-214AB) package; identical electrical specs but 1500 W PPPM and lower RθJA (35 °C/W) | Requires larger PCB footprint and higher mounting pad area (≥10 mm² per terminal); better for high-duty-cycle industrial environments | Choose when thermal management is critical and board real estate permits larger package for enhanced surge endurance |
Compared with SMBJ12CAHE3_A/I and SMCJ12CAHE3_A/I, SMB8J12CAHE3_A/I delivers optimal balance of AEC-Q101 compliance, compact SMB footprint, and 800 W bidirectional clamping - making it ideal for space-constrained automotive and industrial modules where polarity-agnostic protection is mandatory.
Availability
SMB8J12CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom line card surge suppression requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMB8J12CAHE3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMB8JxxCA family is engineered for high-density transient suppression in automotive and industrial systems, delivering AEC-Q101-qualified bidirectional clamping in the compact SMB package to address space, thermal, and qualification constraints.
FAQ
What is the clamping voltage of SMB8J12CAHE3_A/I at its rated peak pulse current?
The SMB8J12CAHE3_A/I has a maximum clamping voltage (VC) of 19.9 V at 40.2 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry remains below 20 V during worst-case surge events, protecting 12 V-rated ICs such as CAN transceivers and microcontrollers.
Is SMB8J12CAHE3_A/I suitable for automotive applications?
Yes, SMB8J12CAHE3_A/I is AEC-Q101 qualified and carries the HE3 suffix denoting RoHS-compliant, automotive-grade construction. It is specifically validated for under-hood and cabin applications including engine control, ADAS sensor interfaces, and body electronics - meeting requirements for temperature cycling, high-temperature reverse bias, and surge endurance per the AEC-Q101 stress test schedule.
How does the bidirectional nature of SMB8J12CAHE3_A/I affect PCB layout?
The SMB8J12CAHE3_A/I has no polarity marking and functions identically in either orientation, simplifying PCB layout by eliminating cathode/anode verification during placement. This symmetry allows direct placement across AC-coupled lines, differential pairs (e.g., RS-485), or uncommitted I/O pins without risk of reverse installation - reducing assembly errors and enabling automated optical inspection (AOI) tolerance.
What is the thermal resistance profile of SMB8J12CAHE3_A/I, and how does it impact layout?
SMB8J12CAHE3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient (RθJA) of 72 °C/W. To maintain safe operation during repetitive surges, the datasheet mandates minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Insufficient copper area raises junction temperature beyond 150 °C, degrading clamping consistency and long-term reliability of the SMB8J12CAHE3_A/I.
Does SMB8J12CAHE3_A/I meet industry-standard surge immunity requirements?
Yes, SMB8J12CAHE3_A/I supports compliance with ISO 7637-2 (automotive), IEC 61000-4-5 (surge), and IEC 61000-4-2 (ESD) when implemented with recommended PCB layout. Its 800 W PPPM rating with 10/1000 μs waveform covers Pulse 5a load dump testing, and its <1 ps response time ensures clamping before sensitive ICs experience overstress - a key requirement for robust SMB8J12CAHE3_A/I deployment.
SMB8J12CAHE3_A/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:
- Obsolete
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J12CAHE3_A/I FAQ
1.How can I place an order for SMB8J12CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J12CAHE3_A/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 SMB8J12CAHE3_A/I reliable?
The price and inventory of SMB8J12CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J12CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMB8J12CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J12CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J12CAHE3_A/I?
SMB8J12CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J12CAHE3_A/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 SMB8J12CAHE3_A/I?
For technical support, including SMB8J12CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J12CAHE3_A/I requirements.
6.How does Aetrix verify that SMB8J12CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J12CAHE3_A/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 SMB8J12CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMB8J12CAHE3_A/I?
All SMB8J12CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J12CAHE3_A/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 SMB8J12CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMB8J12CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J12CAHE3_A/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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