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Vishay General Semiconductor - Diodes Division SM6T12CAHM3_A/I
- Part No.:
- SM6T12CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T12CAHM3_A/I.pdf
- Description:
- TVS DIODE 10.2VWM 16.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,440
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Product details
Overview
SM6T12CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 12 V standoff voltage (VWM = 10.2 V), 600 W peak pulse power (10/1000 μs), clamping voltage of 16.7 V at 36 A, and operating junction temperature up to +150 °C. It protects signal lines and power rails in automotive sensor units and industrial control interfaces against ESD and inductive switching transients.
For engineers reviewing the SM6T12CAHM3_A/I datasheet, SM6T12CAHM3_A/I pinout, SM6T12CAHM3_A/I application, or SM6T12CAHM3_A/I equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification status, halogen-free RoHS compliance, SMB package thermal resistance (RθJL = 20 °C/W), and verified 1000 V ESD immunity per IEC 61000-4-2.
Technical Context
This TVS diode operates symmetrically in both directions due to its CA suffix designation, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<5 μA at VWM).
The device delivers 600 W surge capability under standardized 10/1000 μs waveform conditions when mounted on 5.0 mm × 5.0 mm copper pads, with clamping performance validated across -65 °C to +150 °C operating range and MSL Level 1 moisture sensitivity rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 10.2 V - Maximum continuous reverse working voltage before clamping initiates |
| VBR (min/max) | 11.4 V / 12.6 V - Breakdown voltage range at 1 mA test current, defining turn-on threshold consistency |
| VC @ IPPM | 16.7 V at 36 A - Clamped voltage during 600 W transient, limiting stress on downstream ICs |
| PPPM | 600 W - Peak pulse power handling per 10/1000 μs waveform, critical for load-switching surge immunity |
| TJ max. | +150 °C - Maximum junction temperature, supporting under-hood automotive deployment |
| Package | SMB (DO-214AA) - Surface-mount outline with 2.20 mm height and 5.59 mm length, optimized for automated placement |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration with no polarity marking; terminals are matte tin-plated for J-STD-002 solderability and JESD 22-B102 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward conduction | One terminal of symmetrical P-N junction; interchangeable with cathode in bidirectional operation |
| Cathode | Current exit point in forward conduction | Second terminal of symmetrical P-N junction; functionally identical to anode under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), and floating inputs without external polarity management |
| 600 W peak pulse power | Withstands high-energy transients from relay coil decay or motor commutation in industrial PLC I/O modules |
| AEC-Q101 qualification | Validated for automotive applications including body control modules and ADAS sensor interfaces requiring extended lifetime reliability |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements for green manufacturing |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage exposure to protected ICs-critical for 3.3 V or 5 V logic interfacing with 12 V systems |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus nodes and analog sensor outputs (e.g., pressure, temperature) from battery dump and load-dump transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt surges before reaching signal conditioning circuitry. Use Value: Maintains signal integrity under ISO 7637-2 Pulse 5a (75 V/100 ms) with <16.7 V clamping, preventing ADC saturation or microcontroller reset. | Use Scenario: Safeguarding half-duplex RS-485 transceivers in factory automation controllers exposed to ground loop spikes and EFT bursts. IC Role / Device Role / Timing Role: Transient suppressor bridging A/B differential lines to common-mode ground, absorbing ±1 kV ESD per IEC 61000-4-2. Use Value: Enables uninterrupted communication during 40 A/8/20 μs surge events while preserving data integrity up to 250 kbps. |
| Consumer Power Adapter Input | Medical Equipment ESD Shielding |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for smart home devices subjected to lightning-induced surges on DC output rails. IC Role / Device Role / Timing Role: Fast-response TVS placed after rectification but before linear regulator input to limit transient propagation. Use Value: Limits 600 W transients to ≤16.7 V within 1 ns response time, protecting LDOs and USB-PD controllers from latch-up. | Use Scenario: ESD hardening of patient-connected analog front-ends (e.g., ECG electrode inputs) in portable diagnostic tools. IC Role / Device Role / Timing Role: Low-leakage (≤5 μA) bidirectional clamp isolating sensitive amplifiers from human-body-model discharges. Use Value: Prevents amplifier saturation during ±8 kV contact discharge while maintaining input bias stability for sub-μV signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12CA | Same SMB package, 600 W rating, but VWM = 10 V (vs. 10.2 V), VC = 19.9 V at 30 A - higher clamping voltage | Lacks AEC-Q101 qualification; intended for commercial-grade equipment only | Select when automotive qualification is unnecessary and cost optimization is prioritized over clamping tightness |
| SMCJ12CA | Higher 1500 W rating in larger SMC package (DO-214AB); VWM = 10.2 V, VC = 19.9 V at 75.5 A | Requires PCB area increase (~30% larger footprint); suited for higher-energy surge environments (e.g., telecom base stations) | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and SMB thermal limits are insufficient |
Compared with SMAJ12CA and SMCJ12CA, the SM6T12CAHM3_A/I offers tighter clamping (16.7 V vs. ≥19.9 V), guaranteed AEC-Q101 compliance, and halogen-free construction-making it optimal for space-constrained, safety-critical automotive and industrial designs where precise voltage limiting and long-term reliability are mandatory.
Availability
SM6T12CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial RS-485 gateways, and medical diagnostic equipment requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SM6T12CAHM3_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 high-reliability and automotive-grade solutions.
The SM6T Series is designed specifically for robust transient suppression in harsh environments, targeting automotive, industrial, and medical applications where AEC-Q101 qualification, low clamping ratio, and halogen-free compliance are essential design requirements.
FAQ
What is the clamping voltage of the SM6T12CAHM3_A/I under standard surge conditions?
The SM6T12CAHM3_A/I exhibits a maximum clamping voltage (VC) of 16.7 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 36 A. This value is measured per Figure 1 in Vishay document 88385 and reflects the actual voltage seen by protected circuitry during transient events, ensuring compatibility with 12 V system interfaces and downstream 3.3 V/5 V logic.
Is the SM6T12CAHM3_A/I qualified for automotive use?
Yes, the SM6T12CAHM3_A/I carries AEC-Q101 qualification, confirmed by its HM3 suffix and documentation in Vishay's SM6T series datasheet (Rev. 09-Jan-2024, Doc. #88385). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, making SM6T12CAHM3_A/I suitable for under-hood and chassis-mounted automotive electronics.
Does the SM6T12CAHM3_A/I have polarity markings on the package?
No, the SM6T12CAHM3_A/I is a bidirectional TVS diode and carries no polarity marking on the SMB (DO-214AA) case. Unlike unidirectional variants (e.g., SM6T12A), the CA suffix indicates symmetrical breakdown behavior, allowing either terminal to serve as anode or cathode depending on instantaneous voltage polarity during transient events.
What is the thermal resistance from junction to lead for the SM6T12CAHM3_A/I?
The SM6T12CAHM3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, as specified in the Thermal Characteristics table of Vishay's SM6T datasheet. This parameter enables accurate thermal modeling when the device is soldered to PCB copper pads, supporting reliable power derating above 25 °C ambient temperature.
How does the SM6T12CAHM3_A/I differ from the SM6T12A variant?
The SM6T12CAHM3_A/I is bidirectional with no polarity marking and symmetric clamping in both directions, whereas the SM6T12A is unidirectional with a cathode band marking and conducts only in reverse bias. Both share identical VWM (10.2 V), PPPM (600 W), and SMB packaging, but SM6T12CAHM3_A/I supports AC signal line protection without orientation constraints.
SM6T12CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T12CAHM3_A/I FAQ
1.How can I place an order for SM6T12CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T12CAHM3_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 SM6T12CAHM3_A/I reliable?
The price and inventory of SM6T12CAHM3_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 SM6T12CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SM6T12CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T12CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T12CAHM3_A/I?
SM6T12CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T12CAHM3_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 SM6T12CAHM3_A/I?
For technical support, including SM6T12CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T12CAHM3_A/I requirements.
6.How does Aetrix verify that SM6T12CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SM6T12CAHM3_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 SM6T12CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SM6T12CAHM3_A/I?
All SM6T12CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T12CAHM3_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 SM6T12CAHM3_A/I part is unused and in its original packaging.
Return procedure for SM6T12CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T12CAHM3_A/I Tags
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