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Vishay General Semiconductor - Diodes Division SMBJ12CAHE3/5B
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- Part No.:
- SMBJ12CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CAHE3/5B.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,431
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Product details
Overview
SMBJ12CAHE3/5B from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features a 12 V stand-off voltage (VWM), 19.9 V maximum clamping voltage (VC) at 30.2 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), commonly deployed to protect MOSFET gates and sensor signal lines in industrial motor drives.
For engineers reviewing the SMBJ12CAHE3/5B datasheet, SMBJ12CAHE3/5B pinout, SMBJ12CAHE3/5B application, or SMBJ12CAHE3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both directions due to its bidirectional construction. Its glass-passivated junction enables fast response time (<1 ns) and low incremental surge resistance, ensuring effective suppression of ESD and inductive switching spikes without forward conduction during normal operation.
The SMBJ12CAHE3/5B 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 AEC-Q101 qualification confirms suitability for automotive electronics where reliability under thermal cycling and mechanical stress is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 12 V - Maximum continuous reverse voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (Breakdown, min/max) | 13.3 V / 14.7 V at 1 mA - Confirmed bidirectional breakdown range ensures consistent clamping threshold in either polarity. |
| VC (Clamping, max) | 19.9 V at IPPM = 30.2 A - Limits transient voltage seen by protected ICs to safe levels during 10/1000 µs surges. |
| PPPM | 600 W - Peak pulse power handling capacity with 0.01% duty cycle; supports repetitive surge events in industrial environments. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs derating above 25 °C ambient. |
| TJmax | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-temperature industrial enclosures. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Bidirectional terminal pair | No functional distinction between terminals; identical clamping behavior in both directions; requires no orientation during placement. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against lightning-induced surges and inductive kickback in 24 V industrial control systems. |
| 19.9 V clamping voltage at 30.2 A | Keeps downstream 12 V logic interfaces (e.g., CAN transceivers, microcontroller GPIOs) within absolute maximum ratings during transients. |
| AEC-Q101 qualified | Validates long-term reliability for automotive body electronics, ADAS sensor interfaces, and infotainment power rails. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without moisture-related popcorn failure or delamination. |
| Glass passivated junction | Provides stable leakage performance (<1 µA at VWM) and immunity to humidity-induced parameter drift over 10+ year service life. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and current-sense amplifier inputs against flyback voltage from relay coils and PWM-driven solenoids. IC Role / Device Role / Timing Role: Voltage clamping element placed across MOSFET gate-source or op-amp input pins to limit transient excursions. Use Value: Prevents latch-up or permanent damage to 12 V-rated gate drivers (e.g., TI UCC27531) during 100 V/10 µs inductive spikes. |
Use Scenario: Surge suppression on LIN bus lines and door module switch inputs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Bidirectional transient clamp on low-speed serial communication lines interfacing with microcontrollers. Use Value: Maintains signal integrity below 20 V clamping threshold while surviving ISO 7637-2 Pulse 1 (−150 V, 50 ms) and Pulse 2a (−100 V). |
| Consumer Appliance Power Supplies | Telecom Interface Cards |
|
Use Scenario: Input-stage protection for AC-DC adapters and DC-DC converters subjected to mains-borne surges and ESD events. IC Role / Device Role / Timing Role: Primary-side TVS placed across bulk capacitor or rectifier output to absorb line transients before regulation. Use Value: Absorbs 600 W surges without degradation, enabling compliance with IEC 61000-4-5 Level 3 (2 kV line-earth) with minimal board space. |
Use Scenario: Protection of Ethernet PHY interface pins and RS-485 transceiver inputs in network edge equipment. IC Role / Device Role / Timing Role: Secondary-level clamp on differential data lines to suppress common-mode ESD and induced surges. Use Value: Symmetrical clamping preserves differential signal swing while limiting common-mode excursion to <20 V, preventing receiver saturation. |
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-M3/5B | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free material compliance is mandated by OEM environmental policy. | Choose SMBJ12CA-M3/5B if halogen-free bill-of-materials is required; otherwise SMBJ12CAHE3/5B offers same performance with standard RoHS compliance. |
| SMCJ12CAHE3/5B | Higher 1500 W peak pulse power rating; larger SMC (DO-214AB) package; same VWM/VC values. | Used where higher surge energy absorption is needed (e.g., 48 V telecom power inputs), but requires larger PCB footprint and different pad layout. | Select SMBJ12CAHE3/5B for space-constrained 12 V signal-line protection; choose SMCJ12CAHE3/5B only when >600 W surge margin is explicitly required. |
Compared with SMBJ12CA-M3/5B, the SMBJ12CAHE3/5B provides identical clamping performance and automotive qualification but uses standard RoHS-compliant molding compound instead of halogen-free; versus SMCJ12CAHE3/5B, it trades 2.5× lower surge power for 40% smaller PCB area and compatibility with fine-pitch automated placement.
Availability
SMBJ12CAHE3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and consumer appliance power supplies requiring stable component supply and AEC-Q101 traceability.
Supply support for SMBJ12CAHE3/5B 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 optimization.
The SMBJ series is engineered for high-reliability transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where precise clamping, low leakage, and long-term stability are mandatory.
FAQ
What is the clamping voltage of SMBJ12CAHE3/5B at its rated peak pulse current?
The SMBJ12CAHE3/5B has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current of 30.2 A using the standard 10/1000 µs waveform. This value is measured under defined test conditions per ANSI/IEEE C62.35 and ensures predictable voltage limiting during surge events. The SMBJ12CAHE3/5B maintains this clamping performance bidirectionally, making it suitable for protecting balanced signal lines and dual-rail power domains.
Is SMBJ12CAHE3/5B suitable for automotive applications?
Yes, SMBJ12CAHE3/5B is AEC-Q101 qualified, confirming its reliability for automotive use cases including body electronics, lighting modules, and sensor interfaces. It undergoes rigorous stress testing for temperature cycling, humidity bias, and mechanical shock. The SMBJ12CAHE3/5B also meets MSL Level 1 for lead-free reflow, supporting modern automotive PCB assembly processes without moisture sensitivity concerns.
How does the bidirectional design of SMBJ12CAHE3/5B affect circuit layout?
The SMBJ12CAHE3/5B has no polarity marking and exhibits identical electrical behavior in both directions, eliminating orientation constraints during PCB placement. This simplifies layout for differential signal lines, AC-coupled interfaces, or any application where voltage transients may occur with either polarity. Engineers can place the SMBJ12CAHE3/5B without verifying cathode/anode alignment, reducing assembly errors and enabling symmetric routing around protected nodes.
What is the thermal resistance of SMBJ12CAHE3/5B, and how does it impact power derating?
The SMBJ12CAHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per JEDEC standards. This value directly determines power derating above 25 °C ambient: for example, at 85 °C ambient, the device's 5.0 W steady-state power dissipation must be reduced to ~2.0 W. The SMBJ12CAHE3/5B's thermal performance supports reliable operation in enclosed industrial enclosures without forced airflow.
Can SMBJ12CAHE3/5B replace unidirectional TVS diodes like SMBJ12AHE3/5B in existing designs?
No - SMBJ12CAHE3/5B is bidirectional and lacks polarity marking, whereas SMBJ12AHE3/5B is unidirectional with a defined cathode band. Substituting them requires verifying that the circuit does not rely on forward conduction (e.g., DC bias paths) and that transient polarity is truly symmetrical. The SMBJ12CAHE3/5B should only replace SMBJ12AHE3/5B after confirming no DC blocking or rectification function is required in the original design.
SMBJ12CAHE3/5B 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):
- 30.2A
- Power - Peak Pulse:
- 600W
- 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 (SMBJ)
SMBJ12CAHE3/5B FAQ
1.How can I place an order for SMBJ12CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CAHE3/5B 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 SMBJ12CAHE3/5B reliable?
The price and inventory of SMBJ12CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ12CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CAHE3/5B?
SMBJ12CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CAHE3/5B 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 SMBJ12CAHE3/5B?
For technical support, including SMBJ12CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CAHE3/5B requirements.
6.How does Aetrix verify that SMBJ12CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ12CAHE3/5B 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 SMBJ12CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ12CAHE3/5B?
All SMBJ12CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CAHE3/5B, 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 SMBJ12CAHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ12CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12CAHE3/5B Tags
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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