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Vishay General Semiconductor - Diodes Division SM15T30CAHM3/I
- Part No.:
- SM15T30CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T30CAHM3/I.pdf
- Description:
- TVS DIODE 25.6VWM 41.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,401
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Product details
Overview
SM15T30CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 30 V standoff voltage (VWM), and clamping voltage of 41.5 V at 36 A peak pulse current - used to protect automotive sensor signal lines, industrial I/O ports, and power supply rails against lightning-induced and switching transients.
For engineers reviewing the SM15T30CAHM3/I datasheet, SM15T30CAHM3/I pinout, SM15T30CAHM3/I application, or SM15T30CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and verified 1500 W surge handling per JEDEC-standard waveform - critical for automotive-grade ESD and surge protection design validation.
Technical Context
This device operates as a voltage-clamped crowbar during overvoltage events, with symmetrical breakdown behavior in both polarities due to its bidirectional construction. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and low dynamic impedance across temperature.
Designed for surface-mount placement on PCBs with minimum 8.0 mm × 8.0 mm copper pads per terminal, it delivers thermal resistance of 75 °C/W (junction-to-ambient) and supports continuous operation up to +150 °C junction temperature - enabling robust deployment in under-hood automotive and industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum reverse operating voltage before clamping begins; defines safe working range for 24 V nominal systems. |
| VBR (min/max) | 28.5 V / 31.5 V - measured at 1.0 mA test current; ensures predictable turn-on threshold with ±5% tolerance. |
| VC @ IPPM | 41.5 V at 36 A - clamping voltage under 10/1000 μs surge; limits downstream IC stress to safe levels. |
| PPPM | 1500 W - peak pulse power rating; withstands lightning surges per IEC 61000-4-5 Level 4 (4 kV) when properly laid out. |
| TJ max | +150 °C - maximum junction temperature; enables use in high-ambient under-hood automotive locations. |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height. |
| AEC-Q101 | Qualified - validated for automotive reliability including HTOL, TCT, and ESD testing per AEC specification. |
Pinout & Package
SM15T30CAHM3/I uses the SMC (DO-214AB) package: a surface-mount, bidirectional device with no polarity marking - both terminals are electrically symmetric and interchangeable. The case is molded with UL 94 V-0 rated compound and features matte tin-plated leads compliant with J-STD-002 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | No functional distinction between terminals; either can serve as input or return path in AC-coupled or floating systems. |
| Case (body) | Non-electrical mechanical interface | Thermally conductive but electrically isolated housing; requires no grounding connection for operation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signal lines, differential buses (e.g., CAN, RS-485), and ungrounded power rails without polarity concerns. |
| 1500 W peak pulse power | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive applications with minimal external circuitry. |
| AEC-Q101 qualification | Validates long-term reliability under automotive thermal cycling, humidity, and vibration stresses - required for Tier-1 supplier BOMs. |
| Halogen-free & RoHS-compliant | Complies with EU Directive 2011/65/EU and IPC-1752A material declarations; supports green manufacturing and end-of-life recycling. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during transients - critical for protecting 3.3 V or 5 V logic interfaces downstream of the TVS. |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting analog output signals from engine coolant temperature (ECT) and manifold absolute pressure (MAP) sensors exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input, absorbing transients before they reach sensitive analog front-end circuitry. Use Value: Maintains signal integrity below 41.5 V clamping level while surviving repeated 1500 W surges - extending sensor module lifetime in 12 V/24 V vehicle platforms. | Use Scenario: Safeguarding programmable logic controller (PLC) digital input channels connected to 24 V DC field devices subject to inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Fast-response transient suppressor installed at connector entry point, shunting surge energy directly to ground before entering isolation barriers or optocouplers. Use Value: Enables >100,000 surge cycles at rated IPPM without degradation - reducing unplanned downtime in factory automation systems. |
| Telecom Line Interface | Power Supply Rail Clamping |
Use Scenario: Shielding Ethernet PHY interfaces (e.g., 10/100BASE-TX) from ESD and lightning-induced surges entering via RJ-45 jacks in outdoor base stations. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pairs (e.g., TX+/TX−), providing sub-nanosecond response to common-mode transients. Use Value: Limits induced voltage to <41.5 V while maintaining <0.5 pF junction capacitance - preserving signal integrity up to 100 MHz. | Use Scenario: Clamping 24 V DC input rails in motor drive inverters where MOSFET switching generates repetitive 100 ns–1 μs voltage spikes. IC Role / Device Role / Timing Role: Primary rail-level protector mounted near bulk capacitor, diverting fast-rising edge energy before it propagates into DC-DC converters or gate drivers. Use Value: Handles 36 A peak pulses with <15 Ω dynamic impedance - preventing overvoltage lockout and improving system uptime in harsh electrical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CA | 600 W peak power (vs. 1500 W); SMA package (smaller footprint, higher RθJA = 110 °C/W) | Lower surge capacity suits consumer electronics; not AEC-Q101 qualified | Select when space-constrained and surge threat is limited to IEC 61000-4-2 ESD only. |
| SMCJ30CA | Identical 1500 W rating and SMC package; differs in MSL level (MSL 1 vs. MSL 1 for SM15T30CAHM3/I) and AEC-Q101 status (not qualified vs. HM3 suffix indicates qualification) | Same mechanical fit but lacks automotive qualification documentation and halogen-free assurance | Select only for non-automotive industrial use where AEC-Q101 is not mandated. |
Compared with SMAJ30CA and SMCJ30CA, SM15T30CAHM3/I uniquely combines AEC-Q101 qualification, halogen-free construction, and full 1500 W surge capability in the SMC outline - making it the only choice for production automotive modules requiring traceable compliance and long-term supply continuity.
Availability
SM15T30CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface designs requiring stable component supply, long-lifecycle support, and certified AEC-Q101 reliability.
Supply support for SM15T30CAHM3/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, TVS devices, and optoelectronics with emphasis on high-reliability, high-power, and automotive-grade solutions.
The SM15T Series is engineered specifically for high-energy transient suppression in automotive and industrial environments - delivering robust 1500 W surge handling, AEC-Q101 qualification, and halogen-free compliance in standard SMC packaging.
FAQ
What is the clamping voltage of SM15T30CAHM3/I at its rated peak pulse current?
The SM15T30CAHM3/I has a maximum clamping voltage (VC) of 41.5 V when subjected to its rated peak pulse current (IPPM) of 36 A under the standard 10/1000 μs waveform. This value is guaranteed across temperature and ensures downstream circuitry remains within safe operating limits during surge events. The SM15T30CAHM3/I achieves this with low dynamic impedance and symmetrical bidirectional response.
Is SM15T30CAHM3/I qualified for automotive applications?
Yes, SM15T30CAHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix in its part number. This certification covers stress tests including high-temperature operating life, temperature cycling, and ESD robustness - confirming suitability for under-hood and chassis-mounted automotive electronics. The SM15T30CAHM3/I meets all requirements for Tier-1 automotive BOM inclusion.
What does the "CA" suffix mean in SM15T30CAHM3/I?
The "CA" suffix in SM15T30CAHM3/I denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SM15T30A), the SM15T30CAHM3/I has no cathode band marking and functions identically regardless of terminal orientation, making it ideal for AC-coupled or floating signal paths.
What is the thermal resistance of SM15T30CAHM3/I, and how does it affect layout?
The SM15T30CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain safe junction temperatures under sustained surge conditions, PCB layout must provide adequate copper area and avoid thermal bottlenecks. The SM15T30CAHM3/I's RθJL of 15 °C/W further supports heat transfer through leads to internal planes.
How does SM15T30CAHM3/I differ from SM15T30A in practical design use?
SM15T30CAHM3/I is bidirectional with no polarity marking, while SM15T30A is unidirectional and requires correct cathode orientation. The SM15T30CAHM3/I supports AC signal protection and floating grounds without layout constraints, whereas SM15T30A demands strict polarity alignment and cannot suppress negative transients. Both share identical VWM, VBR, and PPPM, but only SM15T30CAHM3/I is AEC-Q101 qualified and halogen-free.
SM15T30CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 41.5V
- Current - Peak Pulse (10/1000µs):
- 36A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SM15T30CAHM3/I FAQ
1.How can I place an order for SM15T30CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T30CAHM3/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 SM15T30CAHM3/I reliable?
The price and inventory of SM15T30CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T30CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM15T30CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T30CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T30CAHM3/I?
SM15T30CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T30CAHM3/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 SM15T30CAHM3/I?
For technical support, including SM15T30CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T30CAHM3/I requirements.
6.How does Aetrix verify that SM15T30CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM15T30CAHM3/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 SM15T30CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM15T30CAHM3/I?
All SM15T30CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM15T30CAHM3/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 SM15T30CAHM3/I part is unused and in its original packaging.
Return procedure for SM15T30CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T30CAHM3/I Tags
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