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Vishay General Semiconductor - Diodes Division 1.5SMC33CAHM3/I
- Part No.:
- 1.5SMC33CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33CAHM3/I.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,683
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Product details
Overview
1.5SMC33CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 33 V standoff voltage (VWM), 36.8 V minimum breakdown voltage (VBR), 45.7 V maximum clamping voltage (VC) at 32.8 A peak pulse current, and 1500 W peak pulse power capability with a 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the 1.5SMC33CAHM3/I datasheet, 1.5SMC33CAHM3/I pinout, 1.5SMC33CAHM3/I application, or 1.5SMC33CAHM3/I equivalent, this page delivers verified electrical parameters, SMC (DO-214AB) package details, AEC-Q101 qualification status, clamping performance under surge conditions, and direct alternatives for ESD/lightning transient suppression in high-reliability designs.
Technical Context
The 1.5SMC33CAHM3/I operates as a bidirectional avalanche diode, symmetrically clamping voltage transients above ±36.8 V in either polarity without polarity marking. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at 28.2 V), while its low incremental surge resistance enables rapid energy diversion during 10/1000 μs surges.
Rated for -65 °C to +150 °C operation and qualified to AEC-Q101, the device sustains repetitive 1500 W pulses at 0.01 % duty cycle when mounted on 8.0 mm × 8.0 mm copper pads. Its thermal resistance (RθJA = 75 °C/W) and halogen-free, RoHS-compliant HM3 construction support automotive and industrial deployment where long-term reliability under thermal cycling is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 28.2 V - Maximum continuous reverse voltage before significant conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 36.8 V min - Voltage at which device enters avalanche breakdown at 1.0 mA test current; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 45.7 V max at 32.8 A - Peak voltage seen by protected circuit during 10/1000 μs surge; directly limits stress on downstream ICs or MOSFETs. |
| PPPM (Peak Pulse Power) | 1500 W - Energy-handling capacity for standardized lightning/surge events; supports IEC 61000-4-5 Level 4 compliance when properly laid out. |
| Package | SMC (DO-214AB) - Surface-mount package with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated placement and reflow. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per AEC specification. |
| Leakage Current | <1.0 μA at VWM - Ensures minimal power loss and signal integrity degradation in standby or low-power modes. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Cathode/anode terminals are symmetrical; both ends function identically under reverse or forward transient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (End 1) | Transient current entry point (bidirectional) | Accepts surge current from either direction; connects to line being protected (e.g., CAN_H or RS-485 A). |
| Cathode (End 2) | Transient current exit point (bidirectional) | Completes low-impedance path to ground or return rail during clamping; requires low-inductance PCB trace routing. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential lines (e.g., RS-485, CAN, USB D+/D−) without polarity concerns. |
| 1500 W peak pulse rating | Withstands IEC 61000-4-5 10/1000 μs surge waveforms up to 1 kV open-circuit voltage when used with appropriate series impedance. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance requirements for automotive and industrial end equipment without compromising surge robustness. |
| Low clamping ratio (VC/VBR ≈ 1.24) | Minimizes overvoltage overshoot during fast transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs or transceivers. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profiles (peak 260 °C), eliminating bake requirements prior to assembly. |
Applications
| Automotive Sensor Interface | Industrial RS-485 Network |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role: Bidirectional TVS placed between signal line and chassis ground to clamp ±100 V transients within 1 ns. Use Value: Prevents permanent damage to 3.3 V or 5 V microcontrollers and ADC front-ends while maintaining <1.0 μA leakage at 28.2 V operating voltage. |
Use Scenario: Safeguarding RS-485 transceivers (e.g., SN65HVD230) in factory automation nodes exposed to motor switching noise and ground bounce. IC Role / Device Role: Differential-line TVS across A/B bus lines to suppress common-mode surges up to ±30 A without disrupting DC bias. Use Value: Maintains signal integrity with 45.7 V clamping ceiling, ensuring receiver input stays within absolute maximum ratings even during 1500 W surge events. |
| Telecom Line Card Protection | Power Supply Input Stage |
|
Use Scenario: Shielding Ethernet PHY magnetics or DSL line drivers from lightning-induced surges entering via outdoor cabling. IC Role / Device Role: Primary-level TVS on tip/ring or pair lines, coordinated with GDT or MOV secondary protection. Use Value: Fast 1 ns response time and 32.8 A IPPM rating enable effective energy shunting before secondary protectors activate, extending system MTBF. |
Use Scenario: Input-stage surge suppression on 24 V DC industrial power supplies subject to inductive kickback from solenoid loads. IC Role / Device Role: Bidirectional clamp between VIN and GND to limit transient excursions during switch-off events. Use Value: 28.2 V VWM allows compatibility with 24 V nominal systems while 45.7 V VC prevents overvoltage stress on downstream DC-DC controllers and FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | Same VWM (28.2 V), lower PPPM (600 W), SMB package (smaller footprint, higher RθJA = 90 °C/W) | Lower power handling limits use to sub-1 kV IEC 61000-4-5 environments; suitable for space-constrained consumer electronics. | Select SMBJ33CA only when board area is critical and surge energy is ≤600 W; verify thermal derating at elevated ambient temperatures. |
| 1.5KE33CA | Same VWM and VC, axial-leaded DO-201 package, higher RθJA (65 °C/W on FR-4), not AEC-Q101 qualified | Lacks automotive qualification and surface-mount compatibility; intended for prototyping or legacy through-hole designs. | Choose 1.5KE33CA for cost-sensitive non-automotive applications where manual assembly or socketing is acceptable. |
Compared with SMBJ33CA and 1.5KE33CA, the 1.5SMC33CAHM3/I delivers superior surge robustness (1500 W vs. 600 W or 1500 W with inferior thermal performance), AEC-Q101 qualification, and SMC package compatibility with high-volume automated manufacturing - making it the preferred choice for production automotive and industrial systems requiring validated reliability.
Availability
1.5SMC33CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial communication interfaces, telecom line cards, and DC power input stages requiring stable component supply with full traceability and lifecycle management.
Supply support for 1.5SMC33CAHM3/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, high-efficiency solutions.
The 1.5SMC Series is engineered for high-energy transient suppression in demanding environments - targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, precise clamping, and long-term stability are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC33CAHM3/I under a 10/1000 μs surge?
The 1.5SMC33CAHM3/I has a maximum clamping voltage (VC) of 45.7 V at 32.8 A peak pulse current under a 10/1000 μs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and defines the upper voltage limit imposed on protected circuits during surge events. The 1.5SMC33CAHM3/I maintains this clamping performance consistently across its operational temperature range.
Is the 1.5SMC33CAHM3/I suitable for automotive applications?
Yes, the 1.5SMC33CAHM3/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant HM3 construction. It meets automotive requirements for temperature cycling, mechanical shock, and humidity bias testing. Its 1500 W surge rating, -65 °C to +150 °C operating range, and MSL Level 1 handling make the 1.5SMC33CAHM3/I appropriate for engine control units, body electronics, and ADAS sensor interfaces.
What does the "CA" suffix indicate in 1.5SMC33CAHM3/I?
The "CA" suffix in 1.5SMC33CAHM3/I denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both polarities without cathode marking. Unlike unidirectional "A" variants, the 1.5SMC33CAHM3/I clamps voltage surges equally in either direction, making it ideal for AC-coupled or differential signal lines such as CAN, RS-485, or Ethernet pairs.
How does the 1.5SMC33CAHM3/I compare to unidirectional TVS diodes in layout flexibility?
The 1.5SMC33CAHM3/I eliminates polarity orientation constraints during PCB placement, simplifying layout and reducing assembly errors. Since it has no cathode band and functions identically in both directions, designers can route it across differential pairs or AC signals without verifying terminal alignment. This contrasts with unidirectional variants like 1.5SMC33AHM3/I, where incorrect orientation would disable protection - a key advantage of the 1.5SMC33CAHM3/I in high-density or automated assembly environments.
What is the thermal resistance of the 1.5SMC33CAHM3/I, and how does it affect power dissipation?
The 1.5SMC33CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on recommended 8.0 mm × 8.0 mm copper pads. At its rated 6.5 W steady-state power dissipation, this results in a ~488 °C junction rise above ambient - but since the device is intended for transient (not continuous) operation, thermal design focuses on pulse handling. For repetitive surges, derating per Figure 2 in the datasheet is required; the 1.5SMC33CAHM3/I's RθJA supports reliable operation up to 150 °C TJ max under defined duty cycles.
1.5SMC33CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, 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):
- 32.8A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC33CAHM3/I FAQ
1.How can I place an order for 1.5SMC33CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33CAHM3/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 1.5SMC33CAHM3/I reliable?
The price and inventory of 1.5SMC33CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC33CAHM3/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC33CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33CAHM3/I?
1.5SMC33CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33CAHM3/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 1.5SMC33CAHM3/I?
For technical support, including 1.5SMC33CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33CAHM3/I requirements.
6.How does Aetrix verify that 1.5SMC33CAHM3/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33CAHM3/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 1.5SMC33CAHM3/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC33CAHM3/I?
All 1.5SMC33CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33CAHM3/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 1.5SMC33CAHM3/I part is unused and in its original packaging.
Return procedure for 1.5SMC33CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC33CAHM3/I Tags
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