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Vishay General Semiconductor - Diodes Division SMBG12CAHE3/5B
- Part No.:
- SMBG12CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG12CAHE3/5B.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,089
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Product details
Overview
SMBG12CAHE3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), <1.0 µA reverse leakage at VWM, and clamps to ≤19.9 V at 30.2 A peak pulse current - deployed in automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMBG12CAHE3/5B datasheet, SMBG12CAHE3/5B pinout, SMBG12CAHE3/5B application, or SMBG12CAHE3/5B equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, bidirectional clamping behavior, thermal resistance (RθJA = 100 °C/W), and direct replacement guidance for circuit-level ESD/surge protection design.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, IPPM, and VC ratings in forward and reverse directions. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance under repetitive transients.
Designed for surface-mount automated assembly, it meets J-STD-020 MSL Level 1 (260 °C peak reflow) and is qualified to AEC-Q101 for automotive-grade reliability. The device sustains 100 A non-repetitive surge (8.3 ms half-sine) only in unidirectional variants - not applicable to SMBG12CAHE3/5B due to its bidirectional construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse/forward voltage before clamping begins; defines operating margin for protected signal lines. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - guaranteed breakdown threshold range; ensures consistent turn-on across production lots. |
| VC @ IPPM | ≤19.9 V at 30.2 A - clamping voltage during 10/1000 µs surge; limits stress on downstream ICs like CAN transceivers or ADC inputs. |
| ID @ VWM | <1.0 µA - ultra-low leakage preserves signal integrity in high-impedance sensor or reference circuits. |
| PPPM | 600 W - peak pulse power handling per 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 surge immunity. |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments. |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient on standard 5 mm × 5 mm copper pads; informs PCB thermal layout requirements. |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount gull-wing, RoHS-compliant, AEC-Q101 qualified, matte tin-plated terminals solderable per J-STD-020 and JESD 22-B102. No polarity marking - bidirectional symmetry eliminates cathode/anode orientation concerns during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Electrically identical terminal; connects to either side of protected line - no directional installation required. |
| Terminal 2 | Anode / Cathode (bidirectional) | Paired terminal forming symmetrical clamping path; enables differential or common-mode transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal paths (e.g., RS-485, CAN FD bus) without polarity constraints. |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and ADAS sensor interfaces requiring zero-failure reliability. |
| 600 W peak pulse power | Withstands repeated IEC 61000-4-5 surges up to 4 kV (open-circuit) without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VBR ≈ 1.41) | Minimizes let-through energy during fast transients - critical for safeguarding 3.3 V or 5 V logic-level microcontrollers. |
| MSL Level 1 rating | Supports standard lead-free reflow profiles (peak 260 °C) without preconditioning, reducing manufacturing complexity. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) in engine control units against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and ground to clamp ±20 V transients within 1 ns response time. Use Value: Prevents latch-up or permanent damage to 12-bit ADC front-ends and LIN transceivers operating at 12 V supply rails. |
Use Scenario: Shielding 24 V digital input modules from field-wiring induced surges in PLC backplanes and motor drive control cabinets. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing >1 kV/500 A transients per IEC 61000-4-4, located at connector entry point. Use Value: Eliminates need for external series impedance or RC filtering while maintaining <10 ns response to fast-rising EFT bursts. |
| Telecom Line Interface | Consumer USB Port Protection |
|
Use Scenario: Safeguarding Ethernet PHY magnetics and PoE injectors against lightning-induced surges on outdoor telecom links. IC Role / Device Role / Timing Role: Common-mode TVS pair (two SMBG12CAHE3/5B) across differential pairs to suppress asymmetric transients up to 600 W. Use Value: Maintains signal integrity below 100 MHz while meeting GR-1089-CORE Level 3 surge requirements. |
Use Scenario: ESD protection for USB 2.0 D+/D− lines in portable medical devices exposed to human-body-model (HBM) discharges. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at 0 V) bidirectional clamp placed adjacent to USB connector to shunt >8 kV contact ESD. Use Value: Preserves signal rise/fall times (<1 ns degradation) and passes USB-IF compliance testing without data corruption. |
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 | Same VWM (12 V), lower PPPM (600 W → 600 W), but higher VC (23.2 V vs. 19.9 V); SMB (DO-214AA) package - 0.2 mm taller, 0.3 mm wider. | Less effective clamping margin for 3.3 V logic; requires larger PCB footprint and different reflow profile (MSL Level 1 still met). | Select SMBJ12CA only if legacy board layout uses SMB footprint and clamping voltage margin ≥23 V is acceptable. |
| SMAJ12CA | Same VWM (12 V), reduced PPPM (400 W), higher VC (25.5 V), SMA (DO-214AC) package - 30 % smaller footprint but 40 % lower surge capability. | Insufficient for IEC 61000-4-5 Level 3+; unsuitable for automotive under-hood locations due to lower thermal mass. | Choose SMAJ12CA only for space-constrained consumer products with ≤2 kV surge exposure and no AEC-Q101 requirement. |
Compared with SMBJ12CA and SMAJ12CA, SMBG12CAHE3/5B delivers superior clamping performance (19.9 V vs. ≥23.2 V), maintains AEC-Q101 qualification, and fits the compact SMBG outline optimized for high-density automotive PCBs - making it the preferred choice where low let-through voltage and automotive reliability are mandatory.
Availability
SMBG12CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and USB port ESD hardening requiring stable component supply and long-term lifecycle support.
Supply support for SMBG12CAHE3/5B 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, efficiency, and application-specific optimization.
The SMBG series was engineered for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom systems demanding AEC-Q101 validation and repeatable clamping performance.
FAQ
What does the 'CA' suffix indicate in SMBG12CAHE3/5B?
The 'CA' suffix denotes a bidirectional configuration - meaning SMBG12CAHE3/5B provides symmetrical clamping for both positive and negative transients without polarity sensitivity. Unlike unidirectional variants (e.g., SMBG12A), it has no cathode band marking and functions identically regardless of terminal orientation. This makes SMBG12CAHE3/5B ideal for AC-coupled or floating signal lines such as CAN bus or RS-485 interfaces.
Is SMBG12CAHE3/5B suitable for protecting 3.3 V logic circuits?
Yes, SMBG12CAHE3/5B is appropriate for 3.3 V logic protection when used with proper series impedance (e.g., 10–100 Ω current-limiting resistor). Its 19.9 V clamping voltage is not directly compatible with 3.3 V rails alone, but in combination with upstream impedance, it limits let-through energy to safe levels. For direct rail clamping, lower VWM variants like SMBG5.0CAHE3/5B would be more suitable - SMBG12CAHE3/5B targets 12 V systems or signal lines referenced to higher supplies.
Does SMBG12CAHE3/5B meet automotive qualification standards?
Yes, SMBG12CAHE3/5B is explicitly AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix 'HE3' (RoHS-compliant, AEC-Q101 qualified) and documentation revision 09-Jan-2024. It undergoes stress testing for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life - validating suitability for engine control units, body electronics, and ADAS sensor modules in passenger vehicles and commercial trucks.
What is the thermal resistance of SMBG12CAHE3/5B, and how does it affect PCB layout?
SMBG12CAHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain TJ ≤150 °C during repetitive surges, PCB layout must provide adequate copper area and avoid excessive trace length between the device and ground plane. Reducing pad size or using thinner copper increases RθJA, potentially derating surge capability - refer to Figure 2 in Vishay document 88456 for derating curves.
How does SMBG12CAHE3/5B differ from SMBG12AHE3/5B?
SMBG12CAHE3/5B is bidirectional with symmetrical clamping in both polarities, while SMBG12AHE3/5B is unidirectional - featuring a cathode band marking and conducting only in reverse bias. The unidirectional version supports 100 A 8.3 ms surge current (IFSM), whereas SMBG12CAHE3/5B does not specify IFSM due to bidirectional construction. Clamping voltage for SMBG12CAHE3/5B is 19.9 V at 30.2 A, versus 19.9 V at 30.2 A for SMBG12AHE3/5B - identical under 10/1000 µs conditions, but unidirectional types allow DC blocking functionality absent in the CA variant.
SMBG12CAHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- 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):
- 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 (SMBG)
SMBG12CAHE3/5B FAQ
1.How can I place an order for SMBG12CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG12CAHE3/5B 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 SMBG12CAHE3/5B reliable?
The price and inventory of SMBG12CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG12CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBG12CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG12CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG12CAHE3/5B?
SMBG12CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG12CAHE3/5B 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 SMBG12CAHE3/5B?
For technical support, including SMBG12CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG12CAHE3/5B requirements.
6.How does Aetrix verify that SMBG12CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG12CAHE3/5B 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 SMBG12CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBG12CAHE3/5B?
All SMBG12CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG12CAHE3/5B, 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 SMBG12CAHE3/5B part is unused and in its original packaging.
Return procedure for SMBG12CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG12CAHE3/5B Tags
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