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Vishay General Semiconductor - Diodes Division SM15T33CAHE3_A/H
- Part No.:
- SM15T33CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33CAHE3_A/H.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,802
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Product details
Overview
SM15T33CAHE3_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 45.7 V at 33 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 SM15T33CAHE3_A/H datasheet, SM15T33CAHE3_A/H pinout, SM15T33CAHE3_A/H application, or SM15T33CAHE3_A/H equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, 1500 W surge capability, low clamping ratio (1.38), and compatibility with high-impedance transient sources in automotive ECUs and sensor interfaces.
Technical Context
The SM15T33CAHE3_A/H implements a glass-passivated silicon avalanche junction optimized for fast response (<1 ns) to transient overvoltages in both polarities. Its bidirectional architecture eliminates polarity dependency, enabling direct placement across differential or AC-coupled lines without orientation constraints.
Designed for high-reliability automotive environments, it features MSL Level 1 moisture sensitivity, 260 °C lead-free reflow compatibility, and guaranteed short-circuit failure mode under overstress - critical for functional safety–aligned system designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe working range for 24 V automotive systems. |
| VBR min / max | 31.4 V / 34.7 V at 1 mA - Verified breakdown threshold ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 45.7 V at 33 A (10/1000 μs) - Clamping voltage limits downstream IC stress to <1.4× VWM, preserving MOSFET gate integrity. |
| PPPM | 1500 W - Sustains 10/1000 μs lightning surges per ISO 7637-2 Pulse 1/2/5a without degradation. |
| TJ max | +150 °C - Enables operation in under-hood environments with minimal derating up to 125 °C ambient. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix), MSL Level 1, 260 °C peak reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative transients; symmetric with cathode in bidirectional operation. |
| Cathode | Transient current entry (positive polarity) | Accepts forward surge current during positive transients; no band marking on bidirectional devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines or floating signals without polarity concerns - reduces BOM count vs. dual unidirectional TVS. |
| 1500 W peak pulse power | Withstands ISO 7637-2 Pulse 5a (500 V/2 Ω, 10/1000 μs) without failure in typical automotive harness impedance conditions. |
| Glass-passivated junction | Ensures stable VBR and low leakage (<1 μA at VWM) over 15-year automotive lifetime and thermal cycling. |
| AEC-Q101 qualification | Validates reliability for engine control units, ADAS sensors, and body electronics requiring zero field failures. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs of engine control modules against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Transient voltage suppressor placed at board-level input filter stage, clamping surges before DC/DC converters. Use Value: Limits rail voltage to ≤45.7 V during 33 A transients, preventing overvoltage shutdown of microcontrollers and CAN transceivers. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in factory automation PLCs from motor-switching noise. IC Role / Device Role / Timing Role: Bidirectional TVS across differential signal pairs (e.g., 4–20 mA loop or RS-485 bus) to suppress common-mode EFT bursts. Use Value: Maintains signal integrity by clamping ±45.7 V transients within 1 ns, avoiding latch-up in op-amps and ADC front-ends. |
| Telecom Line Interface Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding Ethernet PHY interfaces in outdoor telecom equipment exposed to induced lightning surges. IC Role / Device Role / Timing Role: Secondary protection device after gas discharge tube (GDT), handling residual energy in 10/1000 μs waveform. Use Value: Delivers precise 45.7 V clamping with low dynamic impedance (≈1.39 Ω), minimizing let-through energy to PHY ICs. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, washing machines). IC Role / Device Role / Timing Role: Mounted across motor terminals to clamp inductive kickback before H-bridge MOSFETs. Use Value: Absorbs 1500 W pulses without degradation, extending MOSFET lifetime and eliminating need for snubber RC networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA-E3/57T | 600 W PPPM, SMA package, same VWM/VC but lower surge rating and higher RθJA (110 °C/W). | Not AEC-Q101 qualified; suitable only for commercial-grade consumer products with lower surge threat levels. | Select when cost sensitivity outweighs automotive reliability requirements and surge energy is limited to <600 W. |
| 1.5KE33CA | Through-hole DO-201 package, 1500 W rating, but no AEC-Q101 qualification and MSL Level 3 (requires baking before reflow). | Limited to legacy industrial PCBs with through-hole assembly; incompatible with automated SMT lines and high-reliability automotive programs. | Choose only for repair/refurbish scenarios where SMT compatibility and automotive qualification are not required. |
Compared with SMAJ33CA-E3/57T and 1.5KE33CA, SM15T33CAHE3_A/H uniquely combines AEC-Q101 qualification, SMC surface-mount form factor, 1500 W capability, and MSL Level 1 - making it the sole option for new automotive designs requiring zero-layout change and full process compliance.
Availability
SM15T33CAHE3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom infrastructure equipment, and consumer appliance motor drives requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM15T33CAHE3_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 high-reliability diodes, rectifiers, and protection devices for automotive, industrial, and computing markets.
The SM15T Series was engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - delivering 1500 W surge capability in compact SMC packages with validated short-circuit failure mode.
FAQ
What is the clamping voltage of SM15T33CAHE3_A/H at its rated peak pulse current?
The SM15T33CAHE3_A/H has a maximum clamping voltage (VC) of 45.7 V at 33 A peak pulse current with a 10/1000 μs waveform. This value is measured per Fig. 1 in the Vishay datasheet 88380 and reflects worst-case performance at TA = 25 °C on recommended copper pads. The clamping ratio (VC/VWM) is 1.38, confirming tight voltage control essential for protecting 3.3 V and 5 V logic interfaces downstream.
Is SM15T33CAHE3_A/H suitable for automotive applications?
Yes, SM15T33CAHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use via the "HE3" suffix and "_A/H" packaging code. It meets all stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT). Its SMC package supports lead-free reflow up to 260 °C and MSL Level 1 handling - fulfilling requirements for modern automotive ECUs and ADAS modules.
How does the bidirectional design of SM15T33CAHE3_A/H affect circuit layout?
The bidirectional design of SM15T33CAHE3_A/H eliminates polarity marking - there is no cathode band, allowing orientation-agnostic placement across AC-coupled lines, differential buses (e.g., CAN, RS-485), or floating sensor outputs. This simplifies layout, reduces assembly errors, and avoids the need for two unidirectional devices in series, saving board space and BOM cost compared to discrete anode-cathode configurations.
What is the thermal resistance of SM15T33CAHE3_A/H, and how does it impact power dissipation?
SM15T33CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. At 25 °C ambient, this allows 6.5 W continuous power dissipation (PD). Derating begins above 25 °C per Fig. 2 in datasheet 88380, reaching ~3.3 W at 100 °C ambient - sufficient for intermittent surge duty but not continuous DC blocking applications.
Does SM15T33CAHE3_A/H have a defined failure mode under overstress conditions?
Yes, SM15T33CAHE3_A/H is designed to fail short-circuit under sustained overstress - a defined and predictable failure mode per Vishay's application note. This behavior protects downstream components by triggering upstream fusing or current-limiting circuits rather than opening the line or causing erratic behavior. The short-circuit failure mode is verified across AEC-Q101 qualification testing and is critical for functional safety compliance in ISO 26262–aligned systems.
SM15T33CAHE3_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 (SMCJ)
SM15T33CAHE3_A/H FAQ
1.How can I place an order for SM15T33CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33CAHE3_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 SM15T33CAHE3_A/H reliable?
The price and inventory of SM15T33CAHE3_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 SM15T33CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SM15T33CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33CAHE3_A/H?
SM15T33CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33CAHE3_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 SM15T33CAHE3_A/H?
For technical support, including SM15T33CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33CAHE3_A/H requirements.
6.How does Aetrix verify that SM15T33CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SM15T33CAHE3_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 SM15T33CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SM15T33CAHE3_A/H?
All SM15T33CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33CAHE3_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 SM15T33CAHE3_A/H part is unused and in its original packaging.
Return procedure for SM15T33CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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