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Vishay General Semiconductor - Diodes Division SMB8J12CAHE3/5B
- Part No.:
- SMB8J12CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J12CAHE3/5B.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,995
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Product details
Overview
SMB8J12CAHE3/5B 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 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 - optimized for automotive-grade ESD and load-dump protection in sensor interfaces and power supply rails.
For engineers reviewing the SMB8J12CAHE3/5B datasheet, SMB8J12CAHE3/5B pinout, SMB8J12CAHE3/5B application, or SMB8J12CAHE3/5B equivalent, key selection criteria include AEC-Q101 qualification, bidirectional polarity, low clamping ratio (VC/VWM = 1.66), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector, responding within <1 ps to transients per ANSI/IEEE C62.35 standards. Its glass-passivated junction ensures stable breakdown behavior under repetitive surges, while the bidirectional configuration enables symmetrical clamping across both polarities without external polarity management.
Thermal performance is defined by RθJA = 72 °C/W and RθJL = 20 °C/W, supporting operation from –55 °C to +150 °C junction temperature. The device meets MSL Level 1 (260 °C reflow peak) and is qualified to AEC-Q101 for automotive under-hood and body-control module applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 12 V - maximum continuous reverse working voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 13.3–14.7 V at 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 19.9 V at IPPM = 40.2 A - peak voltage seen by protected circuit during 10/1000 µs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 800 W - maximum transient energy absorption capability with 10/1000 µs waveform; validates suitability for ISO 7637-2 Pulse 1/2/5a. |
| ID (Reverse Leakage) | 5.0 µA max at VWM - negligible standby current; avoids signal distortion or battery drain in always-on circuits. |
| TJ max | +150 °C - maximum junction temperature rating; supports under-hood automotive deployment without derating at 105 °C ambient. |
| AEC-Q101 Qualified | Yes - validated for automotive reliability including HTOL, TC, UHAST, and ESD testing per AEC specification; required for ECUs and ADAS sensors. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetric 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 current path | Both terminals serve identically in bidirectional mode; current flows from either terminal to the other during overvoltage of either polarity. |
| Case (body) | Thermal and mechanical interface | Plastic molding compound meets UL 94 V-0; thermal path to PCB copper via lead frames; requires 0.2" × 0.2" (5.0 mm × 5.0 mm) pad per terminal for rated PPPM. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control, body modules, and ADAS sensors - eliminates need for additional qualification testing. |
| Low clamping ratio (VC/VWM = 1.66) | Minimizes voltage overshoot during surge events, enabling use with 12 V logic and microcontrollers having 20 V absolute maximum ratings. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without dry-pack or baking; compatible with high-volume automated assembly lines using 260 °C peak profile. |
| Glass-passivated junction | Ensures stable VBR over lifetime and temperature; prevents parameter drift under thermal cycling and humidity exposure. |
| Bidirectional symmetry | Eliminates polarity-aware layout constraints; simplifies PCB routing for differential buses (e.g., CAN, LIN) and AC-coupled analog signals. |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Transceiver Protection |
|---|---|
Use Scenario: Protecting analog output pins of pressure, temperature, and position sensors in engine bay modules exposed to ISO 7637-2 load dump and jump-start transients. IC Role / Device Role / Timing Role: Shunt TVS element placed between sensor signal line and ground, clamping transients before they reach ADC input or op-amp buffer. Use Value: Maintains signal integrity under ±200 V/50 ms load dump pulses while adding <0.5 pF capacitance - no bandwidth degradation in DC–10 kHz sensor outputs. |
Use Scenario: Safeguarding CANH/CANL lines in industrial gateways against ESD (±15 kV contact) and surge (IEC 61000-4-5 Level 3). IC Role / Device Role / Timing Role: Bidirectional clamp connected line-to-line and line-to-ground to suppress common-mode and differential-mode transients without disrupting 1 Mbps CAN signaling. Use Value: Clamps to <22 V during 40 A surge, preserving CAN transceiver's 40 V abs max rating; AEC-Q101 grade ensures longevity in factory-floor vibration environments. |
| DC Power Rail Surge Suppression | USB Type-C VBUS Line Protection |
Use Scenario: Secondary-level protection on 12 V auxiliary power rails feeding infotainment head units and telematics modules. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing residual energy after primary fuse or polymer PTC, limiting rail voltage to safe levels during ISO 16750-2 pulse 4a/b. Use Value: Handles 800 W peak pulse without degradation; RθJL = 20 °C/W enables direct thermal coupling to PCB ground plane for sustained surge handling. |
Use Scenario: Overvoltage guard on USB Type-C VBUS line in automotive docking stations subject to hot-plug and adapter fault conditions. IC Role / Device Role / Timing Role: Bidirectional clamp between VBUS and GND, triggered only above 12 V to avoid interference with 5–20 V PD negotiation. Use Value: 19.9 V clamping ensures USB PD controllers (e.g., TUSB564) remain within 20 V abs max rating; low leakage (<5 µA) prevents standby current accumulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA-E3/52 | Same SMB package and 12 V VWM, but commercial-grade (non-AEC-Q101); lower IPPM (36.7 A) and VC (21.2 V); RoHS-compliant only. | Acceptable for consumer or industrial non-automotive designs where AEC qualification and tighter clamping are not required. | Select when cost sensitivity outweighs automotive reliability requirements and 1.3 V higher clamping is tolerable. |
| SMCJ12CAHE3_A/H | Higher-power SMC (DO-214AB) package; same VWM and AEC-Q101 grade; 1500 W PPPM, 125 A IPPM, 23.2 V VC. | Used where higher surge immunity (e.g., ISO 7637-2 Pulse 5b) is mandated, but requires larger PCB area and different pad layout. | Choose when system-level surge test compliance exceeds 800 W - especially for battery disconnect or alternator regulation circuits. |
Compared with SMBJ12CA-E3/52, SMB8J12CAHE3/5B delivers tighter clamping and automotive qualification; versus SMCJ12CAHE3_A/H, it trades surge capacity for space-constrained layouts - making SMB8J12CAHE3/5B optimal for compact, AEC-compliant 12 V node protection.
Availability
SMB8J12CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, DC power rail surge suppression, and USB Type-C VBUS protection requiring stable component supply across extended production lifecycles.
Supply support for SMB8J12CAHE3/5B 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 diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMB8J series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-density, AEC-Q101-compliant transient protection in automotive and harsh-environment industrial systems.
FAQ
What is the clamping voltage of SMB8J12CAHE3/5B at its rated peak pulse current?
The SMB8J12CAHE3/5B has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current (IPPM) of 40.2 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees the protected circuit will not experience more than 19.9 V during such a transient event - critical for ensuring compatibility with 20 V absolute maximum rated ICs.
Is SMB8J12CAHE3/5B suitable for automotive applications?
Yes, SMB8J12CAHE3/5B is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It undergoes rigorous stress testing including high-temperature operating life, temperature cycling, and ESD - making it appropriate for engine control units, body electronics, and ADAS sensor modules where reliability under thermal and mechanical stress is mandatory.
What does the "5B" in SMB8J12CAHE3/5B indicate?
The "5B" denotes the packaging format: 13-inch diameter plastic tape and reel containing 3200 units. This delivery mode supports high-volume SMT assembly lines and is distinct from "52" (7-inch reel, 750 units). The "HE3" suffix confirms RoHS compliance and AEC-Q101 qualification, while "CA" specifies bidirectional configuration.
How does SMB8J12CAHE3/5B differ from unidirectional SMB10J12AHE3/5B?
SMB8J12CAHE3/5B is bidirectional with symmetrical clamping for both polarities and 800 W PPPM, whereas SMB10J12AHE3/5B is unidirectional, rated for 1000 W PPPM and 50.3 A IPPM, and requires correct cathode orientation. The "8" in SMB8J indicates lower surge current rating than "10" in SMB10J, reflecting design trade-offs between package size, thermal mass, and peak power handling.
What PCB layout guidance applies to SMB8J12CAHE3/5B for full power rating?
To achieve the full 800 W peak pulse power rating, SMB8J12CAHE3/5B must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay document 88422. Smaller pads reduce thermal dissipation and cause premature failure under repeated surges; thermal vias to internal ground planes are recommended for sustained duty cycles.
SMB8J12CAHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
SMB8J12CAHE3/5B FAQ
1.How can I place an order for SMB8J12CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J12CAHE3/5B 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 SMB8J12CAHE3/5B reliable?
The price and inventory of SMB8J12CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J12CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J12CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J12CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J12CAHE3/5B?
SMB8J12CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J12CAHE3/5B 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 SMB8J12CAHE3/5B?
For technical support, including SMB8J12CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J12CAHE3/5B requirements.
6.How does Aetrix verify that SMB8J12CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J12CAHE3/5B 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 SMB8J12CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J12CAHE3/5B?
All SMB8J12CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J12CAHE3/5B, 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 SMB8J12CAHE3/5B part is unused and in its original packaging.
Return procedure for SMB8J12CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J12CAHE3/5B Tags
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