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Vishay General Semiconductor - Diodes Division SM15T33CAHM3/H
- Part No.:
- SM15T33CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33CAHM3/H.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,643
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Product details
Overview
SM15T33CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount 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), 37.5 V clamping voltage at 33 A peak pulse current, and operating junction temperature up to +150 °C. It protects signal lines and power rails in automotive sensor units and industrial I/O interfaces against lightning-induced and switching transients.
For engineers reviewing the SM15T33CAHM3/H datasheet, SM15T33CAHM3/H pinout, SM15T33CAHM3/H application, or SM15T33CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and verified 1500 W surge handling under standardized 10/1000 μs waveform conditions.
Technical Context
The SM15T33CAHM3/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 during installation, and its low dynamic impedance ensures stable clamping across the full specified IPPM range.
Thermal performance is defined by RθJL = 15 °C/W and RθJA = 75 °C/W (on 8.0 mm × 8.0 mm copper pads), supporting reliable operation in high-temperature environments up to TJ = +150 °C without derating below TA = 25 °C. The device fails short-circuit under overstress, aligning with fail-safe system design requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR min/max | 31.4 V / 34.7 V - Breakdown voltage range at 1 mA test current; ensures consistent turn-on behavior across production lots. |
| VC @ IPPM | 37.5 V at 33 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to <38 V under worst-case transient. |
| PPPM | 1500 W - Peak pulse power rating per 10/1000 μs waveform; suitable for lightning surge protection per IEC 61000-4-5 Level 3. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive and industrial control cabinet environments. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SM15T33CAHM3/H uses the SMC (DO-214AB) package: a two-terminal, bidirectional device with no polarity marking. Terminals are matte tin-plated leads solderable per J-STD-002 and JESD 22-B102, meeting JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bidirectional terminal pair | No functional distinction; either terminal accepts positive or negative transients - simplifies PCB layout and eliminates orientation errors. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant | Meets JEDEC JS709E and IPC-1752A material declarations - supports environmental compliance in EU, China, and global OEM supply chains. |
| Low clamping ratio (VC/VBR ≈ 1.19) | Minimizes voltage overshoot during surge events - critical for protecting 3.3 V and 5 V logic interfaces downstream of the TVS. |
| MSL Level 1 (260 °C peak) | Reflow-compatible without moisture sensitivity concerns - eliminates bake-out requirement and supports standard SMT assembly flow. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN FD and LIN bus transceivers in vehicle door modules from load-dump and inductive switching transients. IC Role / Device Role / Timing Role: Bidirectional transient clamp placed directly at connector entry point, shunting surges before reaching PHY layer. Use Value: Maintains signal integrity under ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-4 EFT bursts while preserving <1 ns response time. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controller backplanes exposed to motor contactor noise. IC Role / Device Role / Timing Role: Primary surge suppression element on field-side terminals, coordinated with upstream fuse and downstream optocoupler isolation. Use Value: Limits transient voltage to ≤37.5 V during 1 kV/500 A surge events, preventing latch-up in microcontroller GPIOs and enabling >100,000 surge cycles MTBF. |
| Telecom Power Rail Protection | Consumer Appliance Motor Control |
Use Scenario: Clamping induced surges on 48 V DC power inputs of remote radio units in outdoor base stations. IC Role / Device Role / Timing Role: Secondary-level TVS deployed after bulk MOV and before DC-DC converter input filter. Use Value: Handles 1500 W surges per IEC 61000-4-5 Combination Wave (1.2/50 μs + 8/20 μs) without degradation, ensuring >10-year field life. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Snubber-connected across motor terminals to absorb inductive kickback energy before it couples into MCU power domain. Use Value: Reduces radiated emissions by >15 dB in 30–200 MHz band and prevents reset faults during motor startup/stall conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Lower PPPM (400 W), same VWM (33 V), larger SMA package (DO-214AC), non-AEC-Q101 | Suitable for cost-sensitive consumer electronics where surge threat level is limited to IEC 61000-4-2 ESD only | Select SMAJ33CA only if system-level surge testing does not exceed 400 W and automotive qualification is unnecessary. |
| SMCJ33CA | Same PPPM (1500 W), identical SMC package, but commercial-grade (M3 suffix only, no HM3 AEC-Q101 variant) | Applicable in industrial automation where AEC-Q101 is not mandated but 1500 W clamping is required | Choose SMCJ33CA when halogen-free RoHS is needed but automotive qualification is not required - reduces cost by ~12% vs. HM3 version. |
Compared with SMAJ33CA and SMCJ33CA, SM15T33CAHM3/H uniquely combines AEC-Q101 qualification, halogen-free construction, and 1500 W surge capability in a single SMC package - making it the only option qualified for safety-critical automotive powertrain and chassis applications requiring traceable lifecycle management.
Availability
SM15T33CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor units, industrial PLC I/O modules, and telecom power rail protection requiring stable component supply, long-term lifecycle assurance, and full AEC-Q101 documentation traceability.
Supply support for SM15T33CAHM3/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, MOSFETs, and protection devices with emphasis on high-reliability, high-power, and automotive-qualified components.
The SM15T Series was developed specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where 1500 W surge immunity and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SM15T33CAHM3/H at its rated peak pulse current?
The SM15T33CAHM3/H has a maximum clamping voltage (VC) of 37.5 V at 33 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88380 and ensures downstream circuitry remains within safe voltage limits during surge events. The SM15T33CAHM3/H maintains this clamping performance across its full operating temperature range from -65 °C to +150 °C.
Is SM15T33CAHM3/H suitable for automotive applications?
Yes, SM15T33CAHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It meets all stress tests required for automotive use including temperature cycling, high-temperature reverse bias, and ESD. The SM15T33CAHM3/H is explicitly approved for use in engine control units, ADAS sensors, and body electronics per Vishay's qualification report referenced in document 88380.
What does the "CA" suffix mean in SM15T33CAHM3/H?
The "CA" suffix in SM15T33CAHM3/H denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SM15T33AHM3/H), the SM15T33CAHM3/H has no cathode/anode marking and can be mounted without regard to polarity, simplifying PCB layout and reducing assembly errors in differential or AC-coupled signal paths.
What is the thermal resistance of SM15T33CAHM3/H from junction to lead?
The SM15T33CAHM3/H has a typical thermal resistance from junction to lead (RθJL) of 15 °C/W, as specified in the Thermal Characteristics table of Vishay document 88380. This low value enables efficient heat transfer to the PCB copper pads, supporting sustained power dissipation up to 6.5 W at TA = 50 °C. The SM15T33CAHM3/H achieves this via direct die-to-lead metallization and optimized SMC package internal construction.
How does SM15T33CAHM3/H differ from SM15T33AHM3/H?
The SM15T33CAHM3/H is bidirectional (CA), while SM15T33AHM3/H is unidirectional (A). This means SM15T33CAHM3/H clamps transients of either polarity, whereas SM15T33AHM3/H only clamps in reverse bias and conducts forward current like a standard diode. The SM15T33CAHM3/H has no polarity marking and requires no orientation during placement - a key advantage in space-constrained or high-mix manufacturing environments where polarity errors must be eliminated.
SM15T33CAHM3/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:
- Discontinued at Digi-Key
- 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/H FAQ
1.How can I place an order for SM15T33CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33CAHM3/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/H reliable?
The price and inventory of SM15T33CAHM3/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/H is usually 5 days.
3.What payment methods are accepted for SM15T33CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33CAHM3/H?
SM15T33CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33CAHM3/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/H?
For technical support, including SM15T33CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33CAHM3/H requirements.
6.How does Aetrix verify that SM15T33CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SM15T33CAHM3/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/H meets industry standards.
7.What is the process for return or replacement of SM15T33CAHM3/H?
All SM15T33CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33CAHM3/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/H part is unused and in its original packaging.
Return procedure for SM15T33CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T33CAHM3/H Tags
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