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Vishay General Semiconductor - Diodes Division SM15T33CAHM3_A/H
- Part No.:
- SM15T33CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33CAHM3_A/H.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,376
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Product details
Overview
SM15T33CAHM3_A/H 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), 33 V standoff voltage (VWM), and clamping voltage of 59.0 V at 169 A peak pulse current. It provides robust protection for automotive-grade signal lines and power rails against lightning-induced and switching transients.
For engineers reviewing the SM15T33CAHM3_A/H datasheet, SM15T33CAHM3_A/H pinout, SM15T33CAHM3_A/H application, or SM15T33CAHM3_A/H equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, halogen-free RoHS compliance, and thermal resistance (RθJA = 75 °C/W) under standard pad layout.
Technical Context
This bidirectional TVS operates symmetrically across both polarities with identical breakdown (VBR min/max = 31.4 V / 34.7 V at IT = 1.0 mA) and clamping characteristics in either direction. Its low-inductance SMC package and glass-passivated junction support fast response to transients up to 10/1000 μs waveform.
The device is rated for TJ = –65 °C to +150 °C, features MSL Level 1 moisture sensitivity, and is qualified to AEC-Q101 - confirming suitability for automotive electronics where reliability under thermal cycling and mechanical stress is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA |
| VBR (min/max) | 31.4 V / 34.7 V at 1.0 mA - ensures reliable turn-on within tight tolerance for predictable clamping onset |
| VC @ IPPM | 59.0 V at 169 A (10/1000 μs) - defines worst-case voltage seen by protected circuit during surge |
| PPPM | 1500 W - peak transient energy absorption capability without failure under standardized surge waveform |
| RθJA | 75 °C/W - thermal resistance from junction to ambient on 8.0 mm × 8.0 mm copper pads, guiding heatsinking requirements |
| TJ range | –65 °C to +150 °C - enables operation in under-hood automotive environments and industrial control enclosures |
| Package | SMC (DO-214AB) - surface-mount, low-profile package compatible with automated placement and reflow soldering |
Pinout & Package
SM15T33CAHM3_A/H is a bidirectional TVS diode in SMC (DO-214AB) package with no polarity marking; both terminals are functionally identical and symmetrical. The device has two terminals: anode and cathode are not distinguished in bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient input/output node | Connected across protected line and ground (or between differential lines); conducts during overvoltage in either polarity |
| Terminal 2 | Transient input/output node | Second connection point for bidirectional clamping path; forms symmetrical voltage clamp with Terminal 1 |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal paths without polarity constraints |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensor interfaces, and infotainment power rails |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global automotive and industrial OEM supply chains |
| Low clamping ratio (VC/VWM ≈ 1.79) | Minimizes overvoltage stress on downstream ICs while maintaining margin above normal operating voltage |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profiles without baking, simplifying manufacturing logistics |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-supplied ECUs from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between power rail and chassis ground. Use Value: Limits transient voltage to ≤59.0 V during 169 A surges, preventing damage to MCU, CAN transceivers, and analog front-ends. |
Use Scenario: Safeguarding RS-485 or CAN FD bus lines in factory automation controllers exposed to motor switching noise. IC Role / Device Role / Timing Role: Differential-line TVS connected across A/B lines and ground to suppress common-mode and differential-mode transients. Use Value: Maintains signal integrity by clamping ESD and inductive spikes below receiver absolute maximum ratings without adding capacitance-induced timing skew. |
| Consumer Appliance Motor Control | Telecom Power Input Stage |
Use Scenario: Shielding microcontroller I/O driving brushed DC motors in smart home appliances. IC Role / Device Role / Timing Role: Localized TVS at motor driver output pins to absorb back-EMF spikes. Use Value: Prevents latch-up or gate oxide damage in MOSFET drivers by limiting flyback voltage to 59.0 V with sub-ns response time. |
Use Scenario: Front-end surge suppression on 48 V telecom power inputs subject to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-level TVS in series with upstream fuse and filter inductors. Use Value: Absorbs 1500 W peak energy from 10/1000 μs surges, enabling compliance with Level 4 immunity requirements without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Lower peak power (400 W), same VWM (33 V), SMA package (smaller footprint, higher RθJA) | Suitable for lower-energy threats (e.g., ESD-only); not rated for lightning-level transients | Select when board space is constrained and threat level is limited to IEC 61000-4-2 ESD or low-energy switching noise. |
| SMCJ33CA | Same 1500 W rating and SMC package, but commercial-grade (non-AEC-Q101), no halogen-free option | Lacks automotive qualification and environmental compliance for Tier-1 automotive programs | Choose for cost-sensitive industrial or consumer designs where AEC-Q101 and halogen-free status are not required. |
Compared with SMAJ33CA and SMCJ33CA, SM15T33CAHM3_A/H uniquely combines AEC-Q101 qualification, halogen-free construction, and full 1500 W surge capability in a single automotive-grade TVS - making it the only option among the three qualified for safety-critical vehicle subsystems requiring traceable, compliant components.
Availability
SM15T33CAHM3_A/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom power input surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SM15T33CAHM3_A/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, TVS devices, and optoelectronics with emphasis on high-reliability and automotive-grade performance.
The SM15T Series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where 1500 W surge handling and AEC-Q101 validation are mandatory design requirements.
FAQ
What is the clamping voltage of SM15T33CAHM3_A/H at its rated peak pulse current?
The SM15T33CAHM3_A/H clamps to a maximum of 59.0 V when subjected to its rated peak pulse current of 169 A under the standard 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88380 and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SM15T33CAHM3_A/H suitable for automotive applications?
Yes, SM15T33CAHM3_A/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It is explicitly intended for use in engine control modules, body electronics, and ADAS sensor interfaces where reliability under thermal cycling and vibration is required.
Does SM15T33CAHM3_A/H have polarity markings on the package?
No, SM15T33CAHM3_A/H is a bidirectional TVS diode and carries no polarity marking on the SMC (DO-214AB) package. Both terminals are functionally identical, allowing installation without orientation concerns in AC or floating signal paths.
What is the thermal resistance of SM15T33CAHM3_A/H under standard mounting conditions?
The typical junction-to-ambient thermal resistance (RθJA) of SM15T33CAHM3_A/H is 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in Vishay document 88380. This value assumes no additional heatsinking and guides PCB layout for thermal management.
How does the breakdown voltage tolerance of SM15T33CAHM3_A/H compare to its standoff voltage?
SM15T33CAHM3_A/H has a minimum breakdown voltage (VBR) of 31.4 V and maximum of 34.7 V at 1.0 mA test current, while its standoff voltage (VWM) is 33 V. This ensures VWM sits safely within the VBR band - guaranteeing no conduction during normal operation while enabling rapid turn-on during overvoltage events.
SM15T33CAHM3_A/H 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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 33A
- 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)
SM15T33CAHM3_A/H FAQ
1.How can I place an order for SM15T33CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33CAHM3_A/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 SM15T33CAHM3_A/H reliable?
The price and inventory of SM15T33CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T33CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SM15T33CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33CAHM3_A/H?
SM15T33CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33CAHM3_A/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 SM15T33CAHM3_A/H?
For technical support, including SM15T33CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33CAHM3_A/H requirements.
6.How does Aetrix verify that SM15T33CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SM15T33CAHM3_A/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 SM15T33CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SM15T33CAHM3_A/H?
All SM15T33CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33CAHM3_A/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 SM15T33CAHM3_A/H part is unused and in its original packaging.
Return procedure for SM15T33CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T33CAHM3_A/H Tags
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