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Vishay General Semiconductor - Diodes Division SM6T12AHM3_B/H
- Part No.:
- SM6T12AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T12AHM3_B/H.pdf
- Description:
- 600W,12V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,514
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Product details
Overview
SM6T12AHM3_B/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, with 12 V breakdown voltage (VBR = 11.4–12.6 V at 1.0 mA), 10.2 V stand-off voltage (VWM), and 16.7 V clamping voltage (VC) at 36 A peak pulse current. It delivers 600 W peak pulse power (10/1000 μs), supports 100 A non-repetitive forward surge current, and operates from −65 °C to +150 °C - deployed for ESD and inductive-switching transient protection on automotive sensor signal lines.
For engineers reviewing the SM6T12AHM3_B/H datasheet, SM6T12AHM3_B/H pinout, SM6T12AHM3_B/H application, or SM6T12AHM3_B/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, low-clamp performance under 10/1000 μs transients, and compatibility with automated SMT placement on SMB footprint.
Technical Context
The SM6T12AHM3_B/H employs a glass-passivated silicon junction optimized for fast response (<1 ns) to voltage transients, with low dynamic impedance enabling stable clamping during 10/1000 μs surges. Its thermal resistance (RθJA = 100 °C/W) and RθJL = 20 °C/W support reliable power dissipation up to 5.0 W at 50 °C ambient when mounted on 5.0 mm × 5.0 mm copper pads.
Designed as a surface-mount replacement for through-hole TVS devices, it meets J-STD-020 MSL Level 1 (260 °C reflow peak), features matte tin-plated leads compliant with JESD 22-B102, and carries cathode band marking for unidirectional polarity identification - critical for correct orientation in DC-biased protection paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 11.4 V / 12.6 V at 1.0 mA - defines precise avalanche initiation threshold for repeatable clamping onset |
| VWM | 10.2 V - maximum continuous reverse voltage before leakage exceeds 5.0 μA, setting safe operating margin below VBR |
| VC @ IPPM | 16.7 V at 36 A (10/1000 μs) - actual clamped voltage seen by protected IC/MOSFET during surge |
| PPPM | 600 W - peak transient energy absorption capability without failure under standardized waveform |
| TJ max. | +150 °C - enables operation in under-hood automotive environments and industrial enclosures |
| Package | SMB (DO-214AA) - industry-standard 2-pin SMD outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
SMB (DO-214AA) package with axial lead configuration: two terminals (anode and cathode), cathode identified by molded band. Mounting requires minimum 5.0 mm × 5.0 mm copper pad per terminal per Vishay recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VLINE > VBR |
| Anode | Reference/ground return path | Typically tied to system ground plane; completes clamping loop during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 surges in automotive ECUs |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity stress |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and single-reflow processing without baking preconditioning |
| Halogen-free & RoHS-compliant (HM3) | Fulfills automotive OEM material declarations (IMDS, ELV) and environmental compliance requirements |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overstress on downstream components such as CAN transceivers or MCU I/O pins |
Applications
| Automotive Sensor Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control modules exposed to load-dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between sensor signal trace and chassis ground. Use Value: Limits transient voltage to ≤16.7 V, preventing damage to 12 V-rated op-amps and ADC front-ends while maintaining signal integrity. | Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers interfacing with solenoid valves and limit switches. IC Role / Device Role / Timing Role: Standoff protector on dry-contact inputs subjected to relay coil flyback and field wiring ESD. Use Value: Withstands 100 A surge (IFSM), clamps 600 W transients without degradation, and maintains <5 μA leakage at 10.2 V for accurate logic-level detection. |
| Consumer Power Adapter ESD Guard | Telecom Line Interface Protection |
Use Scenario: Secondary-side transient suppression on USB-C PD adapter output rails prone to hot-plug ESD and cable discharge events. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp between VBUS and GND, downstream of DC-DC converter. Use Value: Sub-1 ns response time and 16.7 V clamping ensure USB-PD controller ICs (e.g., FUSB302) remain within absolute maximum ratings during ±8 kV contact discharge. | Use Scenario: Overvoltage protection on RS-485 transceiver bus lines in base station backhaul equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-stage TVS on differential pair, coordinated with common-mode chokes and secondary GDTs. Use Value: 600 W rating handles IEC 61000-4-5 Level 4 (4 kV line-earth) surges; SMB footprint allows dense placement near connector entry points. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-E3/52 | Same SMB package, 12 V VBR, but lower PPPM = 400 W and no AEC-Q101 qualification | Rated for commercial/industrial use only; not approved for automotive under-hood deployment | Select when cost sensitivity outweighs automotive qualification and 600 W surge headroom is unnecessary |
| 1.5SMC12A | Higher PPPM = 1500 W, larger SMC (DO-214AB) package, same VBR range, no AEC-Q101 | Requires PCB area increase (~30% larger footprint); suited for high-energy industrial motor drives | Choose when surge threat level exceeds 600 W and board space permits larger package |
Compared with SMAJ12A-E3/52 and 1.5SMC12A, the SM6T12AHM3_B/H uniquely combines AEC-Q101 qualification, halogen-free compliance, and 600 W capability in the compact SMB outline - making it optimal for space-constrained, automotive-grade signal-line protection where reliability and regulatory alignment are mandatory.
Availability
SM6T12AHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC inputs, consumer power adapter outputs, and telecom RS-485 line protection requiring stable component supply across production lifecycles.
Supply support for SM6T12AHM3_B/H 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SM6T Series is engineered for high-reliability transient suppression in automotive, industrial, and computing systems - delivering consistent clamping performance, AEC-Q101 validation, and SMT-ready packaging for automated manufacturing.
FAQ
What is the clamping voltage of SM6T12AHM3_B/H at its rated peak pulse current?
The SM6T12AHM3_B/H has a maximum clamping voltage (VC) of 16.7 V when subjected to its specified peak pulse current of 36 A under the 10/1000 μs waveform. This value is measured per Figure 1 in Vishay Document 88385 and ensures protected circuitry remains within safe voltage limits during transient events. The SM6T12AHM3_B/H achieves this with low dynamic impedance and stable junction characteristics across temperature.
Is SM6T12AHM3_B/H qualified for automotive applications?
Yes, SM6T12AHM3_B/H is AEC-Q101 qualified, as confirmed by the HM3 suffix in its ordering code - indicating halogen-free, RoHS-compliant construction and full qualification to the AEC-Q101 stress test standard for discrete semiconductors. This makes the SM6T12AHM3_B/H suitable for automotive powertrain, body electronics, and ADAS sensor modules where reliability under thermal and mechanical stress is required.
What does the "_B/H" suffix in SM6T12AHM3_B/H indicate?
The "_B/H" suffix in SM6T12AHM3_B/H denotes the packaging configuration: "B" indicates tape-and-reel delivery in 13-inch diameter reels, and "H" specifies the preferred package code for 7-inch diameter reels per Vishay's ordering matrix. Both variants share identical electrical and mechanical specifications; the suffix reflects logistics and handling format rather than functional differentiation. SM6T12AHM3_B/H is fully interchangeable with SM6T12AHM3_B/I in circuit design.
How does SM6T12AHM3_B/H compare to bidirectional TVS diodes like SM6T12CA?
The SM6T12AHM3_B/H is unidirectional, meaning it protects only against positive transients relative to ground and requires correct cathode orientation. In contrast, SM6T12CA is bidirectional with symmetrical clamping in both polarities - used where AC-coupled or floating lines need protection. The SM6T12AHM3_B/H offers tighter leakage control and higher IFSM (100 A) than its bidirectional counterpart, making it preferable for DC-biased automotive sensor lines.
What is the thermal resistance of SM6T12AHM3_B/H, and how does it affect PCB layout?
The SM6T12AHM3_B/H 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 safe junction temperatures under sustained power dissipation, designers must adhere to Vishay's recommended pad layout - undersized pads increase RθJA, risking thermal runaway. The SM6T12AHM3_B/H's RθJL = 20 °C/W further emphasizes the need for solid thermal connection to internal ground planes.
SM6T12AHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 10.2V
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 16.7V
- Current - Peak Pulse (10/1000µs):
- 36A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T12AHM3_B/H FAQ
1.How can I place an order for SM6T12AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T12AHM3_B/H 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 SM6T12AHM3_B/H reliable?
The price and inventory of SM6T12AHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T12AHM3_B/H is usually 5 days.
3.What payment methods are accepted for SM6T12AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T12AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T12AHM3_B/H?
SM6T12AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T12AHM3_B/H 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 SM6T12AHM3_B/H?
For technical support, including SM6T12AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T12AHM3_B/H requirements.
6.How does Aetrix verify that SM6T12AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SM6T12AHM3_B/H 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 SM6T12AHM3_B/H meets industry standards.
7.What is the process for return or replacement of SM6T12AHM3_B/H?
All SM6T12AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T12AHM3_B/H, 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 SM6T12AHM3_B/H part is unused and in its original packaging.
Return procedure for SM6T12AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T12AHM3_B/H Tags
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