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Vishay General Semiconductor - Diodes Division SM6T36CAHM3_A/I
- Part No.:
- SM6T36CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T36CAHM3_A/I.pdf
- Description:
- TVS DIODE 30.8VWM 49.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,607
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Product details
Overview
SM6T36CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 36 V standoff voltage (VWM), 49.9 V clamping voltage at 12 A peak pulse current, and 600 W peak pulse power with 10/1000 μs waveform. It provides robust ESD and surge protection for automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SM6T36CAHM3_A/I datasheet, SM6T36CAHM3_A/I pinout, SM6T36CAHM3_A/I application, or SM6T36CAHM3_A/I equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, halogen-free RoHS compliance, low clamping ratio (1.39), and thermal resistance of 100 °C/W junction-to-ambient.
Technical Context
This TVS diode operates symmetrically in both directions due to its CA suffix designation, delivering identical breakdown (34.2–37.8 V), clamping (49.9 V @ 12 A), and leakage (<1.0 μA @ 30.8 V) characteristics across polarity. Its glass-passivated junction ensures stable performance under repetitive transients.
Designed for surface-mount automated assembly on 5.0 mm × 5.0 mm copper pads, it meets MSL Level 1 per J-STD-020 with 260 °C reflow peak, and achieves 150 °C maximum junction temperature with 5.0 W steady-state power dissipation on infinite heatsink at 50 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30.8 V - Maximum reverse stand-off voltage before clamping begins; defines safe operating range for protected circuit |
| VBR min/max | 34.2 V / 37.8 V - Breakdown occurs within this band at 1.0 mA test current; ensures predictable turn-on threshold |
| VC @ IPPM | 49.9 V @ 12.0 A - Clamped voltage during 10/1000 μs surge; limits downstream voltage stress |
| PPPM | 600 W - Peak pulse power handling capability; determines survivability against IEC 61000-4-5 Level 4 surges |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; informs PCB pad layout and derating above 25 °C |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional device with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); cathode band absent per bidirectional construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (reverse bias) | Accepts positive-going surge relative to cathode; forms one half of symmetrical clamping path |
| Cathode | Transient current entry point (forward bias) | Accepts negative-going surge relative to anode; completes bidirectional conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both polarities enables single-device protection of AC-coupled or differential signal lines |
| AEC-Q101 qualification | Validated reliability for automotive applications including engine control units and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with JEDEC J-STD-609A Class 2a and EU Directive 2011/65/EU |
| Low clamping ratio | VC/VWM = 1.39 ensures minimal overvoltage exposure to protected ICs during surge events |
| MSL Level 1 rating | Supports standard SMT reflow without moisture sensitivity concerns; no bake required prior to assembly |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp limiting transient voltage to ≤49.9 V during 12 A surges, preserving signal integrity and preventing latch-up. Use Value: Eliminates need for separate unidirectional devices on differential pairs; AEC-Q101 qualification ensures field reliability. | Use Scenario: Shielding 24 V DC digital input modules in programmable logic controllers from inductive kickback and EFT bursts. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) voltage clamping at 30.8 V stand-off, diverting >95 % of 600 W surge energy to ground. Use Value: Enables compact PCB layout with SMB footprint; 100 °C/W RθJA supports operation in enclosed control cabinets up to 70 °C ambient. |
| Telecom Line Interface Protection | Consumer Appliance Motor Control |
Use Scenario: Safeguarding RS-485 transceivers and Ethernet PHYs in base station equipment against lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Symmetrical clamping maintains common-mode rejection while suppressing differential-mode transients up to ±49.9 V. Use Value: Meets IEC 61000-4-5 4 kV line-earth surge immunity without additional series impedance or filtering. | Use Scenario: Protecting microcontroller GPIOs and gate drivers in washing machine motor inverters from commutation spikes. IC Role / Device Role / Timing Role: Absorbs repetitive 100 ns–1 ms transients generated by brushless DC motor switching, with <1 μA leakage at 30.8 V. Use Value: Halogen-free HM3 construction satisfies appliance safety standards (IEC 60335); 150 °C TJ max supports sealed motor housing environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36CA | Same VWM (30.8 V) and VC (49.9 V), but lower PPPM (400 W); SMA package (smaller footprint, higher RθJA = 140 °C/W) | Limited to lower-energy surges; less suitable for automotive load dump where 600 W is required | Select SMAJ36CA only when space constraints outweigh power handling needs and thermal margin is sufficient |
| 1.5KE36CA | Higher PPPM (1500 W), DO-204AC (DO-15) through-hole package; larger size, manual assembly required | Not SMT-compatible; unsuitable for high-volume automated production or dense PCB layouts | Choose 1.5KE36CA only for legacy through-hole designs or where extreme surge energy exceeds 600 W |
Compared with SMAJ36CA and 1.5KE36CA, SM6T36CAHM3_A/I delivers optimal balance of 600 W surge capacity, SMB surface-mount compatibility, AEC-Q101 qualification, and halogen-free compliance-making it the preferred choice for new automotive and industrial SMT designs requiring validated reliability and regulatory alignment.
Availability
SM6T36CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor systems, industrial PLC I/O modules, telecom line interfaces, and consumer appliance motor controls requiring stable component supply and long-term lifecycle support.
Supply support for SM6T36CAHM3_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, rectifiers, MOSFETs, and protection devices with emphasis on high-reliability and automotive-grade solutions.
The SM6T Series is designed specifically for board-level transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, precise clamping, and robust surge handling are mandatory.
FAQ
What does the "CA" suffix indicate in SM6T36CAHM3_A/I?
The "CA" suffix in SM6T36CAHM3_A/I denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both forward and reverse directions. This allows it to protect AC-coupled signals, differential buses like CAN or RS-485, and other applications where polarity reversal may occur. Unlike unidirectional variants (e.g., SM6T36A), SM6T36CAHM3_A/I has no cathode marking and identical electrical characteristics in either direction, including VBR (34.2–37.8 V), VC (49.9 V @ 12 A), and ID (<1.0 μA @ 30.8 V).
Is SM6T36CAHM3_A/I qualified for automotive use?
Yes, SM6T36CAHM3_A/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's SM6T datasheet (Rev. 09-Jan-2024, Doc. #88385). This qualification covers stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), temperature cycling (TCT), and mechanical shock-ensuring reliability in automotive under-hood and cabin environments. The device is explicitly listed for use in automotive sensor units and ECUs.
What is the clamping voltage of SM6T36CAHM3_A/I and how is it measured?
The clamping voltage (VC) of SM6T36CAHM3_A/I is 49.9 V, measured at a peak pulse current (IPPM) of 12.0 A using a 10/1000 μs double-exponential waveform per IEC 61000-4-5. This value represents the maximum voltage that appears across the device during a standardized surge event, directly limiting the voltage seen by downstream components. The clamping ratio (VC/VWM = 1.39) indicates efficient suppression, and the specification is guaranteed across the full operating temperature range (−65 °C to +150 °C).
How does the HM3 suffix differ from E3 or M3 in SM6T36CAHM3_A/I?
The HM3 suffix in SM6T36CAHM3_A/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification-distinguishing it from E3 (RoHS-compliant commercial grade), M3 (halogen-free RoHS-compliant commercial grade), and HE3 (RoHS-compliant AEC-Q101). The "H" prefix confirms automotive qualification, while "M3" specifies halogen-free molding compound and matte tin-plated leads compliant with JESD 201 Class 2 whisker resistance. This makes SM6T36CAHM3_A/I suitable for safety-critical automotive applications where both material compliance and reliability validation are required.
What PCB pad layout is recommended for SM6T36CAHM3_A/I?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad area for each terminal of SM6T36CAHM3_A/I to achieve rated thermal performance and 600 W pulse power handling. The datasheet (Fig. 2) shows derating curves based on this layout, and RθJA is specified as 100 °C/W under these conditions. Smaller pads increase thermal resistance and reduce surge capability; designers must follow the recommended mounting pad dimensions in the package outline drawing (Document #88385, page 4) to ensure compliance with MSL Level 1 and avoid solder joint reliability issues.
SM6T36CAHM3_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):
- 30.8V
- Voltage - Breakdown (Min):
- 34.2V
- Voltage - Clamping (Max) @ Ipp:
- 49.9V
- Current - Peak Pulse (10/1000µs):
- 12A
- 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)
SM6T36CAHM3_A/I FAQ
1.How can I place an order for SM6T36CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T36CAHM3_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 SM6T36CAHM3_A/I reliable?
The price and inventory of SM6T36CAHM3_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 SM6T36CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SM6T36CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T36CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T36CAHM3_A/I?
SM6T36CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T36CAHM3_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 SM6T36CAHM3_A/I?
For technical support, including SM6T36CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T36CAHM3_A/I requirements.
6.How does Aetrix verify that SM6T36CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SM6T36CAHM3_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 SM6T36CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SM6T36CAHM3_A/I?
All SM6T36CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T36CAHM3_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 SM6T36CAHM3_A/I part is unused and in its original packaging.
Return procedure for SM6T36CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T36CAHM3_A/I Tags
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